File:  [LON-CAPA] / loncom / homework / grades.pm
Revision 1.520: download - view: text, annotated - select for diffs
Wed May 14 16:36:31 2008 UTC (16 years, 5 months ago) by www
Branches: MAIN
CVS tags: HEAD
Session lock while scantron grading

# The LearningOnline Network with CAPA
# The LON-CAPA Grading handler
#
# $Id: grades.pm,v 1.520 2008/05/14 16:36:31 www Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::grades;
use strict;
use Apache::style;
use Apache::lonxml;
use Apache::lonnet;
use Apache::loncommon;
use Apache::lonhtmlcommon;
use Apache::lonnavmaps;
use Apache::lonhomework;
use Apache::lonpickcode;
use Apache::loncoursedata;
use Apache::lonmsg();
use Apache::Constants qw(:common);
use Apache::lonlocal;
use Apache::lonenc;
use String::Similarity;
use LONCAPA;

use POSIX qw(floor);



my %perm=();

#  These variables are used to recover from ssi errors

my $ssi_retries = 5;
my $ssi_error;
my $ssi_error_resource;
my $ssi_error_message;


#  Do an ssi with retries:
#  While I'd love to factor out this with the vesrion in lonprintout,
#  that would either require a data coupling between modules, which I refuse to perpetuate
#  (there's quite enough of that already), or would require the invention of another infrastructure
#  I'm not quite ready to invent (e.g. an ssi_with_retry object).
#
# At least the logic that drives this has been pulled out into loncommon.


#
#   ssi_with_retries - Does the server side include of a resource.
#                      if the ssi call returns an error we'll retry it up to
#                      the number of times requested by the caller.
#                      If we still have a proble, no text is appended to the
#                      output and we set some global variables.
#                      to indicate to the caller an SSI error occurred.  
#                      All of this is supposed to deal with the issues described
#                      in LonCAPA BZ 5631 see:
#                      http://bugs.lon-capa.org/show_bug.cgi?id=5631
#                      by informing the user that this happened.
#
# Parameters:
#   resource   - The resource to include.  This is passed directly, without
#                interpretation to lonnet::ssi.
#   form       - The form hash parameters that guide the interpretation of the resource
#                
#   retries    - Number of retries allowed before giving up completely.
# Returns:
#   On success, returns the rendered resource identified by the resource parameter.
# Side Effects:
#   The following global variables can be set:
#    ssi_error                - If an unrecoverable error occurred this becomes true.
#                               It is up to the caller to initialize this to false
#                               if desired.
#    ssi_error_resource  - If an unrecoverable error occurred, this is the value
#                               of the resource that could not be rendered by the ssi
#                               call.
#    ssi_error_message   - The error string fetched from the ssi response
#                               in the event of an error.
#
sub ssi_with_retries {
    my ($resource, $retries, %form) = @_;
    my ($content, $response) = &Apache::loncommon::ssi_with_retries($resource, $retries, %form);
    if ($response->is_error) {
	$ssi_error          = 1;
	$ssi_error_resource = $resource;
	$ssi_error_message  = $response->code . " " . $response->message;
    }

    return $content;

}
#
#  Prodcuces an ssi retry failure error message to the user:
#

sub ssi_print_error {
    my ($r) = @_;
    my $helpurl = &Apache::loncommon::top_nav_help('Helpdesk');
    $r->print('
<br />
<h2>'.&mt('An unrecoverable network error occurred:').'</h2>
<p>
'.&mt('Unable to retrieve a resource from a server:').'<br />
'.&mt('Resource:').' '.$ssi_error_resource.'<br />
'.&mt('Error:').' '.$ssi_error_message.'
</p>
<p>'.
&mt('It is recommended that you try again later, as this error may mean the server was just temporarily unavailable, or is down for maintenance.').'<br />'.
&mt('If the error persists, please contact the [_1] for assistance.',$helpurl).
'</p>');
    return;
}

#
# --- Retrieve the parts from the metadata file.---
sub getpartlist {
    my ($symb) = @_;

    my $navmap   = Apache::lonnavmaps::navmap->new();
    my $res      = $navmap->getBySymb($symb);
    my $partlist = $res->parts();
    my $url      = $res->src();
    my @metakeys = split(/,/,&Apache::lonnet::metadata($url,'keys'));

    my @stores;
    foreach my $part (@{ $partlist }) {
	foreach my $key (@metakeys) {
	    if ($key =~ m/^stores_\Q$part\E_/) { push(@stores,$key); }
	}
    }
    return @stores;
}

# --- Get the symbolic name of a problem and the url
sub get_symb {
    my ($request,$silent) = @_;
    (my $url=$env{'form.url'}) =~ s-^http://($ENV{'SERVER_NAME'}|$ENV{'HTTP_HOST'})--;
    my $symb=($env{'form.symb'} ne '' ? $env{'form.symb'} : (&Apache::lonnet::symbread($url)));
    if ($symb eq '') { 
	if (!$silent) {
	    $request->print("Unable to handle ambiguous references:$url:.");
	    return ();
	}
    }
    &Apache::lonenc::check_decrypt(\$symb);
    return ($symb);
}

#--- Format fullname, username:domain if different for display
#--- Use anywhere where the student names are listed
sub nameUserString {
    my ($type,$fullname,$uname,$udom) = @_;
    if ($type eq 'header') {
	return '<b>&nbsp;'.&mt('Fullname').'&nbsp;</b><span class="LC_internal_info">('.&mt('Username').')</span>';
    } else {
	return '&nbsp;'.$fullname.'<span class="LC_internal_info">&nbsp;('.$uname.
	    ($env{'user.domain'} eq $udom ? '' : ' ('.$udom.')').')</span>';
    }
}

#--- Get the partlist and the response type for a given problem. ---
#--- Indicate if a response type is coded handgraded or not. ---
sub response_type {
    my ($symb) = shift;

    my $navmap = Apache::lonnavmaps::navmap->new();
    my $res = $navmap->getBySymb($symb);
    my $partlist = $res->parts();
    my %vPart = 
	map { $_ => 1 } (&Apache::loncommon::get_env_multiple('form.vPart'));
    my (%response_types,%handgrade);
    foreach my $part (@{ $partlist }) {
	next if (%vPart && !exists($vPart{$part}));

	my @types = $res->responseType($part);
	my @ids = $res->responseIds($part);
	for (my $i=0; $i < scalar(@ids); $i++) {
	    $response_types{$part}{$ids[$i]} = $types[$i];
	    $handgrade{$part.'_'.$ids[$i]} = 
		&Apache::lonnet::EXT('resource.'.$part.'_'.$ids[$i].
				     '.handgrade',$symb);
	}
    }
    return ($partlist,\%handgrade,\%response_types);
}

sub flatten_responseType {
    my ($responseType) = @_;
    my @part_response_id =
	map { 
	    my $part = $_;
	    map {
		[$part,$_]
		} sort(keys(%{ $responseType->{$part} }));
	} sort(keys(%$responseType));
    return @part_response_id;
}

sub get_display_part {
    my ($partID,$symb)=@_;
    my $display=&Apache::lonnet::EXT('resource.'.$partID.'.display',$symb);
    if (defined($display) and $display ne '') {
	$display.= " (<span class=\"LC_internal_info\">id $partID</span>)";
    } else {
	$display=$partID;
    }
    return $display;
}

#--- Show resource title
#--- and parts and response type
sub showResourceInfo {
    my ($symb,$probTitle,$checkboxes) = @_;
    my $col=3;
    if ($checkboxes) { $col=4; }
    my $result = '<h3>'.&mt('Current Resource').': '.$probTitle.'</h3>'."\n";
    $result .='<table border="0">';
    my ($partlist,$handgrade,$responseType) = &response_type($symb);
    my %resptype = ();
    my $hdgrade='no';
    my %partsseen;
    foreach my $partID (sort keys(%$responseType)) {
	foreach my $resID (sort keys(%{ $responseType->{$partID} })) {
	    my $handgrade=$$handgrade{$partID.'_'.$resID};
	    my $responsetype = $responseType->{$partID}->{$resID};
	    $hdgrade = $handgrade if ($handgrade eq 'yes');
	    $result.='<tr>';
	    if ($checkboxes) {
		if (exists($partsseen{$partID})) {
		    $result.="<td>&nbsp;</td>";
		} else {
		    $result.="<td><input type='checkbox' name='vPart' value='$partID' checked='checked' /></td>";
		}
		$partsseen{$partID}=1;
	    }
	    my $display_part=&get_display_part($partID,$symb);
	    $result.='<td>'.&mt('<b>Part: </b>[_1]',$display_part).' <span class="LC_internal_info">'.
		$resID.'</span></td>'.
		'<td>'.&mt('<b>Type: </b>[_1]',$responsetype).'</td></tr>';
#	    '<td>'.&mt('<b>Handgrade: </b>[_1]',$handgrade).'</td></tr>';
	}
    }
    $result.='</table>'."\n";
    return $result,$responseType,$hdgrade,$partlist,$handgrade;
}

sub reset_caches {
    &reset_analyze_cache();
    &reset_perm();
}

{
    my %analyze_cache;

    sub reset_analyze_cache {
	undef(%analyze_cache);
    }

    sub get_analyze {
	my ($symb,$uname,$udom)=@_;
	my $key = "$symb\0$uname\0$udom";
	return $analyze_cache{$key} if (exists($analyze_cache{$key}));

	my (undef,undef,$url)=&Apache::lonnet::decode_symb($symb);
	$url=&Apache::lonnet::clutter($url);
	my $subresult=&ssi_with_retries($url, $ssi_retries,
					   ('grade_target' => 'analyze',
					    'grade_domain' => $udom,
					    'grade_symb' => $symb,
					    'grade_courseid' => 
					    $env{'request.course.id'},
					    'grade_username' => $uname));
	(undef,$subresult)=split(/_HASH_REF__/,$subresult,2);
	my %analyze=&Apache::lonnet::str2hash($subresult);
	return $analyze_cache{$key} = \%analyze;
    }

    sub get_order {
	my ($partid,$respid,$symb,$uname,$udom)=@_;
	my $analyze = &get_analyze($symb,$uname,$udom);
	return $analyze->{"$partid.$respid.shown"};
    }

    sub get_radiobutton_correct_foil {
	my ($partid,$respid,$symb,$uname,$udom)=@_;
	my $analyze = &get_analyze($symb,$uname,$udom);
	foreach my $foil (@{&get_order($partid,$respid,$symb,$uname,$udom)}) {
	    if ($analyze->{"$partid.$respid.foil.value.$foil"} eq 'true') {
		return $foil;
	    }
	}
    }
}

#--- Clean response type for display
#--- Currently filters option/rank/radiobutton/match/essay/Task
#        response types only.
sub cleanRecord {
    my ($answer,$response,$symb,$partid,$respid,$record,$order,$version,
	$uname,$udom) = @_;
    my $grayFont = '<span class="LC_internal_info">';
    if ($response =~ /^(option|rank)$/) {
	my %answer=&Apache::lonnet::str2hash($answer);
	my %grading=&Apache::lonnet::str2hash($record->{$version."resource.$partid.$respid.submissiongrading"});
	my ($toprow,$bottomrow);
	foreach my $foil (@$order) {
	    if ($grading{$foil} == 1) {
		$toprow.='<td><b>'.$answer{$foil}.'&nbsp;</b></td>';
	    } else {
		$toprow.='<td><i>'.$answer{$foil}.'&nbsp;</i></td>';
	    }
	    $bottomrow.='<td>'.$grayFont.$foil.'</span>&nbsp;</td>';
	}
	return '<blockquote><table border="1">'.
	    '<tr valign="top"><td>'.&mt('Answer').'</td>'.$toprow.'</tr>'.
	    '<tr valign="top"><td>'.$grayFont.&mt('Option ID').'</span></td>'.
	    $grayFont.$bottomrow.'</tr>'.'</table></blockquote>';
    } elsif ($response eq 'match') {
	my %answer=&Apache::lonnet::str2hash($answer);
	my %grading=&Apache::lonnet::str2hash($record->{$version."resource.$partid.$respid.submissiongrading"});
	my @items=&Apache::lonnet::str2array($record->{$version."resource.$partid.$respid.submissionitems"});
	my ($toprow,$middlerow,$bottomrow);
	foreach my $foil (@$order) {
	    my $item=shift(@items);
	    if ($grading{$foil} == 1) {
		$toprow.='<td><b>'.$item.'&nbsp;</b></td>';
		$middlerow.='<td><b>'.$grayFont.$answer{$foil}.'&nbsp;</span></b></td>';
	    } else {
		$toprow.='<td><i>'.$item.'&nbsp;</i></td>';
		$middlerow.='<td><i>'.$grayFont.$answer{$foil}.'&nbsp;</span></i></td>';
	    }
	    $bottomrow.='<td>'.$grayFont.$foil.'</span>&nbsp;</td>';
	}
	return '<blockquote><table border="1">'.
	    '<tr valign="top"><td>'.&mt('Answer').'</td>'.$toprow.'</tr>'.
	    '<tr valign="top"><td>'.$grayFont.&mt('Item ID').'</span></td>'.
	    $middlerow.'</tr>'.
	    '<tr valign="top"><td>'.$grayFont.&mt('Option ID').'</span></td>'.
	    $bottomrow.'</tr>'.'</table></blockquote>';
    } elsif ($response eq 'radiobutton') {
	my %answer=&Apache::lonnet::str2hash($answer);
	my ($toprow,$bottomrow);
	my $correct = 
	    &get_radiobutton_correct_foil($partid,$respid,$symb,$uname,$udom);
	foreach my $foil (@$order) {
	    if (exists($answer{$foil})) {
		if ($foil eq $correct) {
		    $toprow.='<td><b>'.&mt('true').'</b></td>';
		} else {
		    $toprow.='<td><i>'.&mt('true').'</i></td>';
		}
	    } else {
		$toprow.='<td>'.&mt('false').'</td>';
	    }
	    $bottomrow.='<td>'.$grayFont.$foil.'</span>&nbsp;</td>';
	}
	return '<blockquote><table border="1">'.
	    '<tr valign="top"><td>'.&mt('Answer').'</td>'.$toprow.'</tr>'.
	    '<tr valign="top"><td>'.$grayFont.&mt('Option ID').'</span></td>'.
	    $grayFont.$bottomrow.'</tr>'.'</table></blockquote>';
    } elsif ($response eq 'essay') {
	if (! exists ($env{'form.'.$symb})) {
	    my (%keyhash) = &Apache::lonnet::dump('nohist_handgrade',
						  $env{'course.'.$env{'request.course.id'}.'.domain'},
						  $env{'course.'.$env{'request.course.id'}.'.num'});

	    my $loginuser = $env{'user.name'}.':'.$env{'user.domain'};
	    $env{'form.keywords'} = $keyhash{$symb.'_keywords'} ne '' ? $keyhash{$symb.'_keywords'} : '';
	    $env{'form.kwclr'}    = $keyhash{$loginuser.'_kwclr'} ne '' ? $keyhash{$loginuser.'_kwclr'} : 'red';
	    $env{'form.kwsize'}   = $keyhash{$loginuser.'_kwsize'} ne '' ? $keyhash{$loginuser.'_kwsize'} : '0';
	    $env{'form.kwstyle'}  = $keyhash{$loginuser.'_kwstyle'} ne '' ? $keyhash{$loginuser.'_kwstyle'} : '';
	    $env{'form.'.$symb} = 1; # so that we don't have to read it from disk for multiple sub of the same prob.
	}
	$answer =~ s-\n-<br />-g;
	return '<br /><br /><blockquote><tt>'.&keywords_highlight($answer).'</tt></blockquote>';
    } elsif ( $response eq 'organic') {
	my $result='Smile representation: "<tt>'.$answer.'</tt>"';
	my $jme=$record->{$version."resource.$partid.$respid.molecule"};
	$result.=&Apache::chemresponse::jme_img($jme,$answer,400);
	return $result;
    } elsif ( $response eq 'Task') {
	if ( $answer eq 'SUBMITTED') {
	    my $files = $record->{$version."resource.$respid.$partid.bridgetask.portfiles"};
	    my $result = &Apache::bridgetask::file_list($files,$uname,$udom);
	    return $result;
	} elsif ( grep(/^\Q$version\E.*?\.instance$/, keys(%{$record})) ) {
	    my @matches = grep(/^\Q$version\E.*?\.instance$/,
			       keys(%{$record}));
	    return join('<br />',($version,@matches));
			       
			       
	} else {
	    my $result =
		'<p>'
		.&mt('Overall result: [_1]',
		     $record->{$version."resource.$respid.$partid.status"})
		.'</p>';
	    
	    $result .= '<ul>';
	    my @grade = grep(/^\Q${version}resource.$respid.$partid.\E[^.]*[.]status$/,
			     keys(%{$record}));
	    foreach my $grade (sort(@grade)) {
		my ($dim) = ($grade =~/[.]([^.]+)[.]status$/);
		$result.= '<li>'.&mt("Dimension: [_1], status [_2] ",
				     $dim, $record->{$grade}).
			  '</li>';
	    }
	    $result.='</ul>';
	    return $result;
	}
    } elsif ( $response =~ m/(?:numerical|formula)/) {
	$answer = 
	    &Apache::loncommon::format_previous_attempt_value('submission',
							      $answer);
    }
    return $answer;
}

#-- A couple of common js functions
sub commonJSfunctions {
    my $request = shift;
    $request->print(<<COMMONJSFUNCTIONS);
<script type="text/javascript" language="javascript">
    function radioSelection(radioButton) {
	var selection=null;
	if (radioButton.length > 1) {
	    for (var i=0; i<radioButton.length; i++) {
		if (radioButton[i].checked) {
		    return radioButton[i].value;
		}
	    }
	} else {
	    if (radioButton.checked) return radioButton.value;
	}
	return selection;
    }

    function pullDownSelection(selectOne) {
	var selection="";
	if (selectOne.length > 1) {
	    for (var i=0; i<selectOne.length; i++) {
		if (selectOne[i].selected) {
		    return selectOne[i].value;
		}
	    }
	} else {
            // only one value it must be the selected one
	    return selectOne.value;
	}
    }
</script>
COMMONJSFUNCTIONS
}

#--- Dumps the class list with usernames,list of sections,
#--- section, ids and fullnames for each user.
sub getclasslist {
    my ($getsec,$filterlist,$getgroup) = @_;
    my @getsec;
    my @getgroup;
    my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
    if (!ref($getsec)) {
	if ($getsec ne '' && $getsec ne 'all') {
	    @getsec=($getsec);
	}
    } else {
	@getsec=@{$getsec};
    }
    if (grep(/^all$/,@getsec)) { undef(@getsec); }
    if (!ref($getgroup)) {
	if ($getgroup ne '' && $getgroup ne 'all') {
	    @getgroup=($getgroup);
	}
    } else {
	@getgroup=@{$getgroup};
    }
    if (grep(/^all$/,@getgroup)) { undef(@getgroup); }

    my ($classlist,$keylist)=&Apache::loncoursedata::get_classlist();
    # Bail out if we were unable to get the classlist
    return if (! defined($classlist));
    &Apache::loncoursedata::get_group_memberships($classlist,$keylist);
    #
    my %sections;
    my %fullnames;
    foreach my $student (keys(%$classlist)) {
        my $end      = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_END()];
        my $start    = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_START()];
        my $id       = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_ID()];
        my $section  = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_SECTION()];
        my $fullname = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_FULLNAME()];
        my $status   = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_STATUS()];
        my $group   = 
            $classlist->{$student}->[&Apache::loncoursedata::CL_GROUP()];
	# filter students according to status selected
	if ($filterlist && (!($stu_status =~ /Any/))) {
	    if (!($stu_status =~ $status)) {
		delete($classlist->{$student});
		next;
	    }
	}
	# filter students according to groups selected
	my @stu_groups = split(/,/,$group);
	if (@getgroup) {
	    my $exclude = 1;
	    foreach my $grp (@getgroup) {
	        foreach my $stu_group (@stu_groups) {
	            if ($stu_group eq $grp) {
	                $exclude = 0;
    	            } 
	        }
    	        if (($grp eq 'none') && !$group) {
        	        $exclude = 0;
        	}
	    }
	    if ($exclude) {
	        delete($classlist->{$student});
	    }
	}
	$section = ($section ne '' ? $section : 'none');
	if (&canview($section)) {
	    if (!@getsec || grep(/^\Q$section\E$/,@getsec)) {
		$sections{$section}++;
		if ($classlist->{$student}) {
		    $fullnames{$student}=$fullname;
		}
	    } else {
		delete($classlist->{$student});
	    }
	} else {
	    delete($classlist->{$student});
	}
    }
    my %seen = ();
    my @sections = sort(keys(%sections));
    return ($classlist,\@sections,\%fullnames);
}

sub canmodify {
    my ($sec)=@_;
    if ($perm{'mgr'}) {
	if (!defined($perm{'mgr_section'})) {
	    # can modify whole class
	    return 1;
	} else {
	    if ($sec eq $perm{'mgr_section'}) {
		#can modify the requested section
		return 1;
	    } else {
		# can't modify the request section
		return 0;
	    }
	}
    }
    #can't modify
    return 0;
}

sub canview {
    my ($sec)=@_;
    if ($perm{'vgr'}) {
	if (!defined($perm{'vgr_section'})) {
	    # can modify whole class
	    return 1;
	} else {
	    if ($sec eq $perm{'vgr_section'}) {
		#can modify the requested section
		return 1;
	    } else {
		# can't modify the request section
		return 0;
	    }
	}
    }
    #can't modify
    return 0;
}

#--- Retrieve the grade status of a student for all the parts
sub student_gradeStatus {
    my ($symb,$udom,$uname,$partlist) = @_;
    my %record     = &Apache::lonnet::restore($symb,$env{'request.course.id'},$udom,$uname);
    my %partstatus = ();
    foreach (@$partlist) {
	my ($status,undef)   = split(/_/,$record{"resource.$_.solved"},2);
	$status              = 'nothing' if ($status eq '');
	$partstatus{$_}      = $status;
	my $subkey           = "resource.$_.submitted_by";
	$partstatus{$subkey} = $record{$subkey} if ($record{$subkey} ne '');
    }
    return %partstatus;
}

# hidden form and javascript that calls the form
# Use by verifyscript and viewgrades
# Shows a student's view of problem and submission
sub jscriptNform {
    my ($symb) = @_;
    my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
    my $jscript='<script type="text/javascript" language="javascript">'."\n".
	'    function viewOneStudent(user,domain) {'."\n".
	'	document.onestudent.student.value = user;'."\n".
	'	document.onestudent.userdom.value = domain;'."\n".
	'	document.onestudent.submit();'."\n".
	'    }'."\n".
	'</script>'."\n";
    $jscript.= '<form action="/adm/grades" method="post" name="onestudent">'."\n".
	'<input type="hidden" name="symb"    value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="saveState" value="'.$env{'form.saveState'}.'" />'."\n".
	'<input type="hidden" name="probTitle" value="'.$env{'form.probTitle'}.'" />'."\n".
	'<input type="hidden" name="Status"  value="'.$stu_status.'" />'."\n".
	'<input type="hidden" name="command" value="submission" />'."\n".
	'<input type="hidden" name="student" value="" />'."\n".
	'<input type="hidden" name="userdom" value="" />'."\n".
	'</form>'."\n";
    return $jscript;
}



# Given the score (as a number [0-1] and the weight) what is the final
# point value? This function will round to the nearest tenth, third,
# or quarter if one of those is within the tolerance of .00001.
sub compute_points {
    my ($score, $weight) = @_;
    
    my $tolerance = .00001;
    my $points = $score * $weight;

    # Check for nearness to 1/x.
    my $check_for_nearness = sub {
        my ($factor) = @_;
        my $num = ($points * $factor) + $tolerance;
        my $floored_num = floor($num);
        if ($num - $floored_num < 2 * $tolerance * $factor) {
            return $floored_num / $factor;
        }
        return $points;
    };

    $points = $check_for_nearness->(10);
    $points = $check_for_nearness->(3);
    $points = $check_for_nearness->(4);
    
    return $points;
}

#------------------ End of general use routines --------------------

#
# Find most similar essay
#

sub most_similar {
    my ($uname,$udom,$uessay,$old_essays)=@_;

# ignore spaces and punctuation

    $uessay=~s/\W+/ /gs;

# ignore empty submissions (occuring when only files are sent)

    unless ($uessay=~/\w+/) { return ''; }

# these will be returned. Do not care if not at least 50 percent similar
    my $limit=0.6;
    my $sname='';
    my $sdom='';
    my $scrsid='';
    my $sessay='';
# go through all essays ...
    foreach my $tkey (keys(%$old_essays)) {
	my ($tname,$tdom,$tcrsid)=map {&unescape($_)} (split(/\./,$tkey));
# ... except the same student
        next if (($tname eq $uname) && ($tdom eq $udom));
	my $tessay=$old_essays->{$tkey};
	$tessay=~s/\W+/ /gs;
# String similarity gives up if not even limit
	my $tsimilar=&String::Similarity::similarity($uessay,$tessay,$limit);
# Found one
	if ($tsimilar>$limit) {
	    $limit=$tsimilar;
	    $sname=$tname;
	    $sdom=$tdom;
	    $scrsid=$tcrsid;
	    $sessay=$old_essays->{$tkey};
	}
    }
    if ($limit>0.6) {
       return ($sname,$sdom,$scrsid,$sessay,$limit);
    } else {
       return ('','','','',0);
    }
}

#-------------------------------------------------------------------

#------------------------------------ Receipt Verification Routines
#
#--- Check whether a receipt number is valid.---
sub verifyreceipt {
    my $request  = shift;

    my $courseid = $env{'request.course.id'};
    my $receipt  = &Apache::lonnet::recprefix($courseid).'-'.
	$env{'form.receipt'};
    $receipt     =~ s/[^\-\d]//g;
    my ($symb)   = &get_symb($request);

    my $title.=
	'<h3><span class="LC_info">'.
	&mt('Verifying Submission Receipt [_1]',$receipt).
	'</span></h3>'."\n".
	'<h4>'.&mt('<b>Resource: </b>[_1]',$env{'form.probTitle'}).
	'</h4>'."\n";

    my ($string,$contents,$matches) = ('','',0);
    my (undef,undef,$fullname) = &getclasslist('all','0');
    
    my $receiptparts=0;
    if ($env{"course.$courseid.receiptalg"} eq 'receipt2' ||
	$env{"course.$courseid.receiptalg"} eq 'receipt3') { $receiptparts=1; }
    my $parts=['0'];
    if ($receiptparts) { ($parts)=&response_type($symb); }
    
    my $header = 
	&Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th>&nbsp;'.&mt('Fullname').'&nbsp;</th>'."\n".
	'<th>&nbsp;'.&mt('Username').'&nbsp;</th>'."\n".
	'<th>&nbsp;'.&mt('Domain').'&nbsp;</th>';
    if ($receiptparts) {
	$header.='<th>&nbsp;'.&mt('Problem Part').'&nbsp;</th>';
    }
    $header.=
	&Apache::loncommon::end_data_table_header_row();

    foreach (sort 
	     {
		 if (lc($$fullname{$a}) ne lc($$fullname{$b})) {
		     return (lc($$fullname{$a}) cmp lc($$fullname{$b}));
		 }
		 return $a cmp $b;
	     } (keys(%$fullname))) {
	my ($uname,$udom)=split(/\:/);
	foreach my $part (@$parts) {
	    if ($receipt eq &Apache::lonnet::ireceipt($uname,$udom,$courseid,$symb,$part)) {
		$contents.=
		    &Apache::loncommon::start_data_table_row().
		    '<td>&nbsp;'."\n".
		    '<a href="javascript:viewOneStudent(\''.$uname.'\',\''.$udom.
		    '\');" target="_self">'.$$fullname{$_}.'</a>&nbsp;</td>'."\n".
		    '<td>&nbsp;'.$uname.'&nbsp;</td>'.
		    '<td>&nbsp;'.$udom.'&nbsp;</td>';
		if ($receiptparts) {
		    $contents.='<td>&nbsp;'.$part.'&nbsp;</td>';
		}
		$contents.= 
		    &Apache::loncommon::end_data_table_row()."\n";
		
		$matches++;
	    }
	}
    }
    if ($matches == 0) {
	$string = $title.&mt('No match found for the above receipt.');
    } else {
	$string = &jscriptNform($symb).$title.
	    '<p>'.
	    &mt('The above receipt matches the following [numerate,_1,student].',$matches).
	    '</p>'.
	    $header.
	    $contents.
	    &Apache::loncommon::end_data_table()."\n";
    }
    return $string.&show_grading_menu_form($symb);
}

#--- This is called by a number of programs.
#--- Called from the Grading Menu - View/Grade an individual student
#--- Also called directly when one clicks on the subm button 
#    on the problem page.
sub listStudents {
    my ($request) = shift;

    my ($symb) = &get_symb($request);
    my $cdom      = $env{"course.$env{'request.course.id'}.domain"};
    my $cnum      = $env{"course.$env{'request.course.id'}.num"};
    my $getsec    = $env{'form.section'} eq '' ? 'all' : $env{'form.section'};
    my $getgroup  = $env{'form.group'} eq '' ? 'all' : $env{'form.group'};
    my $submitonly= $env{'form.submitonly'} eq '' ? 'all' : $env{'form.submitonly'};
    my $viewgrade = $env{'form.showgrading'} eq 'yes' ? 'View/Grade/Regrade' : 'View';
    $env{'form.probTitle'} = $env{'form.probTitle'} eq '' ? 
	&Apache::lonnet::gettitle($symb) : $env{'form.probTitle'};

    my $result='<h3><span class="LC_info">&nbsp;'.
	&mt($viewgrade.' Submissions for a Student or a Group of Students')
	.'</span></h3>';

    my ($table,undef,$hdgrade,$partlist,$handgrade) = &showResourceInfo($symb,$env{'form.probTitle'},($env{'form.showgrading'} eq 'yes'));

    my %lt = ( 'multiple' =>
	       "Please select a student or group of students before clicking on the Next button.",
	       'single'   =>
	       "Please select the student before clicking on the Next button.",
	       );
    %lt = &Apache::lonlocal::texthash(%lt);
    $request->print(<<LISTJAVASCRIPT);
<script type="text/javascript" language="javascript">
    function checkSelect(checkBox) {
	var ctr=0;
	var sense="";
	if (checkBox.length > 1) {
	    for (var i=0; i<checkBox.length; i++) {
		if (checkBox[i].checked) {
		    ctr++;
		}
	    }
	    sense = '$lt{'multiple'}';
	} else {
	    if (checkBox.checked) {
		ctr = 1;
	    }
	    sense = '$lt{'single'}';
	}
	if (ctr == 0) {
	    alert(sense);
	    return false;
	}
	document.gradesub.submit();
    }

    function reLoadList(formname) {
	if (formname.saveStatusOld.value == pullDownSelection(formname.Status)) {return;}
	formname.command.value = 'submission';
	formname.submit();
    }
</script>
LISTJAVASCRIPT

    &commonJSfunctions($request);
    $request->print($result);

    my $checkhdgrade = ($env{'form.handgrade'} eq 'yes' && scalar(@$partlist) > 1 ) ? 'checked="checked"' : '';
    my $checklastsub = $checkhdgrade eq '' ? 'checked="checked"' : '';
    my $gradeTable='<form action="/adm/grades" method="post" name="gradesub">'.
	"\n".$table;
	
    $gradeTable .= 
	'&nbsp;'.
	&mt('<b>View Problem Text: </b>[_1]',
	    '<label><input type="radio" name="vProb" value="no" checked="checked" /> '.&mt('no').' </label>'."\n".
	    '<label><input type="radio" name="vProb" value="yes" /> '.&mt('one student').' </label>'."\n".
	    '<label><input type="radio" name="vProb" value="all" /> '.&mt('all students').' </label>').'<br />'."\n";
    $gradeTable .= 
	'&nbsp;'.
	&mt('<b>View Answer: </b>[_1]',
	    '<label><input type="radio" name="vAns" value="no"  /> '.&mt('no').' </label>'."\n".
	    '<label><input type="radio" name="vAns" value="yes" /> '.&mt('one student').' </label>'."\n".
	    '<label><input type="radio" name="vAns" value="all" checked="checked" /> '.&mt('all students').' </label>').'<br />'."\n";

    my $submission_options;
    if ($env{'form.handgrade'} eq 'yes' && scalar(@$partlist) > 1) {
	$submission_options.=
	    '<label><input type="radio" name="lastSub" value="hdgrade" '.$checkhdgrade.' /> '.&mt('essay part only').' </label>'."\n";
    }
    my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
    my $saveStatus = $stu_status eq '' ? 'Active' : $stu_status;
    $env{'form.Status'} = $saveStatus;
    $submission_options.=
	'<label><input type="radio" name="lastSub" value="lastonly" '.$checklastsub.' /> '.&mt('last submission only').' </label>'."\n".
	'<label><input type="radio" name="lastSub" value="last" /> '.&mt('last submission &amp; parts info').' </label>'."\n".
	'<label><input type="radio" name="lastSub" value="datesub" /> '.&mt('by dates and submissions').' </label>'."\n".
	'<label><input type="radio" name="lastSub" value="all" /> '.&mt('all details').'</label>';
    $gradeTable .= 
	'&nbsp;'.
	&mt('<b>Submissions: </b>[_1]',$submission_options).'<br />'."\n";

    $gradeTable .= 
        '&nbsp;'.
	&mt('<b>Grading Increments:</b> [_1]',
	    '<select name="increment">'.
	    '<option value="1">'.&mt('Whole Points').'</option>'.
	    '<option value=".5">'.&mt('Half Points').'</option>'.
	    '<option value=".25">'.&mt('Quarter Points').'</option>'.
	    '<option value=".1">'.&mt('Tenths of a Point').'</option>'.
	    '</select>');
    
    $gradeTable .= 
        &build_section_inputs().
	'<input type="hidden" name="submitonly"  value="'.$submitonly.'" />'."\n".
	'<input type="hidden" name="handgrade"   value="'.$env{'form.handgrade'}.'" /><br />'."\n".
	'<input type="hidden" name="showgrading" value="'.$env{'form.showgrading'}.'" /><br />'."\n".
	'<input type="hidden" name="saveState"   value="'.$env{'form.saveState'}.'" />'."\n".
	'<input type="hidden" name="probTitle"   value="'.$env{'form.probTitle'}.'" />'."\n".
	'<input type="hidden" name="symb" value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="saveStatusOld" value="'.$saveStatus.'" />'."\n";

    if (exists($env{'form.gradingMenu'}) && exists($env{'form.Status'})) {
	$gradeTable.='<input type="hidden" name="Status"   value="'.$stu_status.'" />'."\n";
    } else {
	$gradeTable.=&mt('<b>Student Status:</b> [_1]',
			 &Apache::lonhtmlcommon::StatusOptions($saveStatus,undef,1,'javascript:reLoadList(this.form);')).'<br />';
    }

    $gradeTable.=&mt('To '.lc($viewgrade).' a submission or a group of submissions, click on the check box(es) '.
	'next to the student\'s name(s). Then click on the Next button.').'<br />'."\n".
	'<input type="hidden" name="command" value="processGroup" />'."\n";

# checkall buttons
    $gradeTable.=&check_script('gradesub', 'stuinfo');
    $gradeTable.='<input type="button" '."\n".
	'onClick="javascript:checkSelect(this.form.stuinfo);" '."\n".
	'value="'.&mt('Next-&gt;').'" /> <br />'."\n";
    $gradeTable.=&check_buttons();
    $gradeTable.='<label><input type="checkbox" name="checkPlag" checked="checked" />'.&mt('Check For Plagiarism').'</label>';
    my ($classlist, undef, $fullname) = &getclasslist($getsec,'1',$getgroup);
    $gradeTable.= &Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row();
    my $loop = 0;
    while ($loop < 2) {
	$gradeTable.='<th>'.&mt('No.').'</th><th>'.&mt('Select').'</th>'.
	    '<th>'.&nameUserString('header').'&nbsp;'.&mt('Section/Group').'</th>';
	if ($env{'form.showgrading'} eq 'yes' 
	    && $submitonly ne 'queued'
	    && $submitonly ne 'all') {
	    foreach my $part (sort(@$partlist)) {
		my $display_part=
		    &get_display_part((split(/_/,$part))[0],$symb);
		$gradeTable.=
		    '<th>'.&mt('Part: [_1] Status',$display_part).'</th>';
	    }
	} elsif ($submitonly eq 'queued') {
	    $gradeTable.='<th>'.&mt('Queue Status').'&nbsp;</th>';
	}
	$loop++;
#	$gradeTable.='<td></td>' if ($loop%2 ==1);
    }
    $gradeTable.=&Apache::loncommon::end_data_table_header_row()."\n";

    my $ctr = 0;
    foreach my $student (sort 
			 {
			     if (lc($$fullname{$a}) ne lc($$fullname{$b})) {
				 return (lc($$fullname{$a}) cmp lc($$fullname{$b}));
			     }
			     return $a cmp $b;
			 }
			 (keys(%$fullname))) {
	my ($uname,$udom) = split(/:/,$student);

	my %status = ();

	if ($submitonly eq 'queued') {
	    my %queue_status = 
		&Apache::bridgetask::get_student_status($symb,$cdom,$cnum,
							$udom,$uname);
	    next if (!defined($queue_status{'gradingqueue'}));
	    $status{'gradingqueue'} = $queue_status{'gradingqueue'};
	}

	if ($env{'form.showgrading'} eq 'yes' 
	    && $submitonly ne 'queued'
	    && $submitonly ne 'all') {
	    (%status) =&student_gradeStatus($symb,$udom,$uname,$partlist);
	    my $submitted = 0;
	    my $graded = 0;
	    my $incorrect = 0;
	    foreach (keys(%status)) {
		$submitted = 1 if ($status{$_} ne 'nothing');
		$graded = 1 if ($status{$_} =~ /^ungraded/);
		$incorrect = 1 if ($status{$_} =~ /^incorrect/);
		
		my ($foo,$partid,$foo1) = split(/\./,$_);
		if ($status{'resource.'.$partid.'.submitted_by'} ne '') {
		    $submitted = 0;
		    my ($part)=split(/\./,$partid);
		    $gradeTable.='<input type="hidden" name="'.
			$student.':'.$part.':submitted_by" value="'.
			$status{'resource.'.$partid.'.submitted_by'}.'" />';
		}
	    }
	    
	    next if (!$submitted && ($submitonly eq 'yes' ||
				     $submitonly eq 'incorrect' ||
				     $submitonly eq 'graded'));
	    next if (!$graded && ($submitonly eq 'graded'));
	    next if (!$incorrect && $submitonly eq 'incorrect');
	}

	$ctr++;
	my $section = $classlist->{$student}->[&Apache::loncoursedata::CL_SECTION()];
        my $group = $classlist->{$student}->[&Apache::loncoursedata::CL_GROUP()];
	if ( $perm{'vgr'} eq 'F' ) {
	    if ($ctr%2 ==1) {
		$gradeTable.= &Apache::loncommon::start_data_table_row();
	    }
	    $gradeTable.='<td align="right">'.$ctr.'&nbsp;</td>'.
               '<td align="center"><label><input type=checkbox name="stuinfo" value="'.
               $student.':'.$$fullname{$student}.':::SECTION'.$section.
	       ')&nbsp;" />&nbsp;&nbsp;</label></td>'."\n".'<td>'.
	       &nameUserString(undef,$$fullname{$student},$uname,$udom).
	       '&nbsp;'.$section.($group ne '' ?'/'.$group:'').'</td>'."\n";

	    if ($env{'form.showgrading'} eq 'yes' && $submitonly ne 'all') {
		foreach (sort keys(%status)) {
		    next if ($_ =~ /^resource.*?submitted_by$/);
		    $gradeTable.='<td align="center">&nbsp;'.&mt($status{$_}).'&nbsp;</td>'."\n";
		}
	    }
#	    $gradeTable.='<td></td>' if ($ctr%2 ==1);
	    if ($ctr%2 ==0) {
		$gradeTable.=&Apache::loncommon::end_data_table_row()."\n";
	    }
	}
    }
    if ($ctr%2 ==1) {
	$gradeTable.='<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>';
	    if ($env{'form.showgrading'} eq 'yes' 
		&& $submitonly ne 'queued'
		&& $submitonly ne 'all') {
		foreach (@$partlist) {
		    $gradeTable.='<td>&nbsp;</td>';
		}
	    } elsif ($submitonly eq 'queued') {
		$gradeTable.='<td>&nbsp;</td>';
	    }
	$gradeTable.=&Apache::loncommon::end_data_table_row();
    }

    $gradeTable.=&Apache::loncommon::end_data_table()."\n".
	'<input type="button" '.
	'onClick="javascript:checkSelect(this.form.stuinfo);" '.
	'value="'.&mt('Next-&gt;').'" /></form>'."\n";
    if ($ctr == 0) {
	my $num_students=(scalar(keys(%$fullname)));
	if ($num_students eq 0) {
	    $gradeTable='<br />&nbsp;<span class="LC_warning">'.&mt('There are no students currently enrolled.').'</span>';
	} else {
	    my $submissions='submissions';
	    if ($submitonly eq 'incorrect') { $submissions = 'incorrect submissions'; }
	    if ($submitonly eq 'graded'   ) { $submissions = 'ungraded submissions'; }
	    if ($submitonly eq 'queued'   ) { $submissions = 'queued submissions'; }
	    $gradeTable='<br />&nbsp;<span class="LC_warning">'.
		&mt('No '.$submissions.' found for this resource for any students. ([_1] students checked for '.$submissions.')',
		    $num_students).
		'</span><br />';
	}
    } elsif ($ctr == 1) {
	$gradeTable =~ s/type="checkbox"/type="checkbox" checked="checked"/;
    }
    $gradeTable.=&show_grading_menu_form($symb);
    $request->print($gradeTable);
    return '';
}

#---- Called from the listStudents routine

sub check_script {
    my ($form, $type)=@_;
    my $chkallscript='<script type="text/javascript">
    function checkall() {
        for (i=0; i<document.forms.'.$form.'.elements.length; i++) {
            ele = document.forms.'.$form.'.elements[i];
            if (ele.name == "'.$type.'") {
            document.forms.'.$form.'.elements[i].checked=true;
                                       }
        }
    }

    function checksec() {
        for (i=0; i<document.forms.'.$form.'.elements.length; i++) {
            ele = document.forms.'.$form.'.elements[i];
           string = document.forms.'.$form.'.chksec.value;
           if
          (ele.value.indexOf(":::SECTION"+string)>0) {
              document.forms.'.$form.'.elements[i].checked=true;
            }
        }
    }


    function uncheckall() {
        for (i=0; i<document.forms.'.$form.'.elements.length; i++) {
            ele = document.forms.'.$form.'.elements[i];
            if (ele.name == "'.$type.'") {
            document.forms.'.$form.'.elements[i].checked=false;
                                       }
        }
    }

</script>'."\n";
    return $chkallscript;
}

sub check_buttons {
    my $buttons.='<input type="button" onclick="checkall()" value="'.&mt('Check All').'" />';
    $buttons.='<input type="button" onclick="uncheckall()" value="'.&mt('Uncheck All').'" />&nbsp;';
    $buttons.='<input type="button" onclick="checksec()" value="'.&mt('Check Section/Group').'" />';
    $buttons.='<input type="text" size="5" name="chksec" />&nbsp;';
    return $buttons;
}

#     Displays the submissions for one student or a group of students
sub processGroup {
    my ($request)  = shift;
    my $ctr        = 0;
    my @stuchecked = &Apache::loncommon::get_env_multiple('form.stuinfo');
    my $total      = scalar(@stuchecked)-1;

    foreach my $student (@stuchecked) {
	my ($uname,$udom,$fullname) = split(/:/,$student);
	$env{'form.student'}        = $uname;
	$env{'form.userdom'}        = $udom;
	$env{'form.fullname'}       = $fullname;
	&submission($request,$ctr,$total);
	$ctr++;
    }
    return '';
}

#------------------------------------------------------------------------------------
#
#-------------------------- Next few routines handles grading by student, essentially
#                           handles essay response type problem/part
#
#--- Javascript to handle the submission page functionality ---
sub sub_page_js {
    my $request = shift;
    $request->print(<<SUBJAVASCRIPT);
<script type="text/javascript" language="javascript">
    function updateRadio(formname,id,weight) {
	var gradeBox = formname["GD_BOX"+id];
	var radioButton = formname["RADVAL"+id];
	var oldpts = formname["oldpts"+id].value;
	var pts = checkSolved(formname,id) == 'update' ? gradeBox.value : oldpts;
	gradeBox.value = pts;
	var resetbox = false;
	if (isNaN(pts) || pts < 0) {
	    alert("A number equal or greater than 0 is expected. Entered value = "+pts);
	    for (var i=0; i<radioButton.length; i++) {
		if (radioButton[i].checked) {
		    gradeBox.value = i;
		    resetbox = true;
		}
	    }
	    if (!resetbox) {
		formtextbox.value = "";
	    }
	    return;
	}

	if (pts > weight) {
	    var resp = confirm("You entered a value ("+pts+
			       ") greater than the weight for the part. Accept?");
	    if (resp == false) {
		gradeBox.value = oldpts;
		return;
	    }
	}

	for (var i=0; i<radioButton.length; i++) {
	    radioButton[i].checked=false;
	    if (pts == i && pts != "") {
		radioButton[i].checked=true;
	    }
	}
	updateSelect(formname,id);
	formname["stores"+id].value = "0";
    }

    function writeBox(formname,id,pts) {
	var gradeBox = formname["GD_BOX"+id];
	if (checkSolved(formname,id) == 'update') {
	    gradeBox.value = pts;
	} else {
	    var oldpts = formname["oldpts"+id].value;
	    gradeBox.value = oldpts;
	    var radioButton = formname["RADVAL"+id];
	    for (var i=0; i<radioButton.length; i++) {
		radioButton[i].checked=false;
		if (i == oldpts) {
		    radioButton[i].checked=true;
		}
	    }
	}
	formname["stores"+id].value = "0";
	updateSelect(formname,id);
	return;
    }

    function clearRadBox(formname,id) {
	if (checkSolved(formname,id) == 'noupdate') {
	    updateSelect(formname,id);
	    return;
	}
	gradeSelect = formname["GD_SEL"+id];
	for (var i=0; i<gradeSelect.length; i++) {
	    if (gradeSelect[i].selected) {
		var selectx=i;
	    }
	}
	var stores = formname["stores"+id];
	if (selectx == stores.value) { return };
	var gradeBox = formname["GD_BOX"+id];
	gradeBox.value = "";
	var radioButton = formname["RADVAL"+id];
	for (var i=0; i<radioButton.length; i++) {
	    radioButton[i].checked=false;
	}
	stores.value = selectx;
    }

    function checkSolved(formname,id) {
	if (formname["solved"+id].value == "correct_by_student" && formname.overRideScore.value == 'no') {
	    var reply = confirm("This problem has been graded correct by the computer. Do you want to change the score?");
	    if (!reply) {return "noupdate";}
	    formname.overRideScore.value = 'yes';
	}
	return "update";
    }

    function updateSelect(formname,id) {
	formname["GD_SEL"+id][0].selected = true;
	return;
    }

//=========== Check that a point is assigned for all the parts  ============
    function checksubmit(formname,val,total,parttot) {
	formname.gradeOpt.value = val;
	if (val == "Save & Next") {
	    for (i=0;i<=total;i++) {
		for (j=0;j<parttot;j++) {
		    var partid = formname["partid"+i+"_"+j].value;
		    if (formname["GD_SEL"+i+"_"+partid][0].selected) {
			var points = formname["GD_BOX"+i+"_"+partid].value;
			if (points == "") {
			    var name = formname["name"+i].value;
			    var studentID = (name != '' ? name : formname["unamedom"+i].value);
			    var resp = confirm("You did not assign a score for "+studentID+
					       ", part "+partid+". Continue?");
			    if (resp == false) {
				formname["GD_BOX"+i+"_"+partid].focus();
				return false;
			    }
			}
		    }
		    
		}
	    }
	    
	}
	if (val == "Grade Student") {
	    formname.showgrading.value = "yes";
	    if (formname.Status.value == "") {
		formname.Status.value = "Active";
	    }
	    formname.studentNo.value = total;
	}
	formname.submit();
    }

//======= Check that a score is assigned for all the problems (page/sequence grading only) =========
    function checkSubmitPage(formname,total) {
	noscore = new Array(100);
	var ptr = 0;
	for (i=1;i<total;i++) {
	    var partid = formname["q_"+i].value;
	    if (formname["GD_SEL"+i+"_"+partid][0].selected) {
		var points = formname["GD_BOX"+i+"_"+partid].value;
		var status = formname["solved"+i+"_"+partid].value;
		if (points == "" && status != "correct_by_student") {
		    noscore[ptr] = i;
		    ptr++;
		}
	    }
	}
	if (ptr != 0) {
	    var sense = ptr == 1 ? ": " : "s: ";
	    var prolist = "";
	    if (ptr == 1) {
		prolist = noscore[0];
	    } else {
		var i = 0;
		while (i < ptr-1) {
		    prolist += noscore[i]+", ";
		    i++;
		}
		prolist += "and "+noscore[i];
	    }
	    var resp = confirm("You did not assign any score for the following problem"+sense+prolist+". Continue?");
	    if (resp == false) {
		return false;
	    }
	}

	formname.submit();
    }
</script>
SUBJAVASCRIPT
}

#--- javascript for essay type problem --
sub sub_page_kw_js {
    my $request = shift;
    my $iconpath = $request->dir_config('lonIconsURL');
    &commonJSfunctions($request);

    my $inner_js_msg_central=<<INNERJS;
    <script text="text/javascript">
    function checkInput() {
      opener.document.SCORE.msgsub.value = opener.checkEntities(document.msgcenter.msgsub.value);
      var nmsg   = opener.document.SCORE.savemsgN.value;
      var usrctr = document.msgcenter.usrctr.value;
      var newval = opener.document.SCORE["newmsg"+usrctr];
      newval.value = opener.checkEntities(document.msgcenter.newmsg.value);

      var msgchk = "";
      if (document.msgcenter.subchk.checked) {
         msgchk = "msgsub,";
      }
      var includemsg = 0;
      for (var i=1; i<=nmsg; i++) {
          var opnmsg = opener.document.SCORE["savemsg"+i];
          var frmmsg = document.msgcenter["msg"+i];
          opnmsg.value = opener.checkEntities(frmmsg.value);
          var showflg = opener.document.SCORE["shownOnce"+i];
          showflg.value = "1";
          var chkbox = document.msgcenter["msgn"+i];
          if (chkbox.checked) {
             msgchk += "savemsg"+i+",";
             includemsg = 1;
          }
      }
      if (document.msgcenter.newmsgchk.checked) {
         msgchk += "newmsg"+usrctr;
         includemsg = 1;
      }
      imgformname = opener.document.SCORE["mailicon"+usrctr];
      imgformname.src = "$iconpath/"+((includemsg) ? "mailto.gif" : "mailbkgrd.gif");
      var includemsg = opener.document.SCORE["includemsg"+usrctr];
      includemsg.value = msgchk;

      self.close()

    }
    </script>
INNERJS

    my $inner_js_highlight_central=<<INNERJS;
 <script type="text/javascript">
    function updateChoice(flag) {
      opener.document.SCORE.kwclr.value = opener.radioSelection(document.hlCenter.kwdclr);
      opener.document.SCORE.kwsize.value = opener.radioSelection(document.hlCenter.kwdsize);
      opener.document.SCORE.kwstyle.value = opener.radioSelection(document.hlCenter.kwdstyle);
      opener.document.SCORE.refresh.value = "on";
      if (opener.document.SCORE.keywords.value!=""){
         opener.document.SCORE.submit();
      }
      self.close()
    }
</script>
INNERJS

    my $start_page_msg_central = 
        &Apache::loncommon::start_page('Message Central',$inner_js_msg_central,
				       {'js_ready'  => 1,
					'only_body' => 1,
					'bgcolor'   =>'#FFFFFF',});
    my $end_page_msg_central = 
	&Apache::loncommon::end_page({'js_ready' => 1});


    my $start_page_highlight_central = 
        &Apache::loncommon::start_page('Highlight Central',
				       $inner_js_highlight_central,
				       {'js_ready'  => 1,
					'only_body' => 1,
					'bgcolor'   =>'#FFFFFF',});
    my $end_page_highlight_central = 
	&Apache::loncommon::end_page({'js_ready' => 1});

    my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
    $docopen=~s/^document\.//;
    $request->print(<<SUBJAVASCRIPT);
<script type="text/javascript" language="javascript">

//===================== Show list of keywords ====================
  function keywords(formname) {
    var nret = prompt("Keywords list, separated by a space. Add/delete to list if desired.",formname.keywords.value);
    if (nret==null) return;
    formname.keywords.value = nret;

    if (formname.keywords.value != "") {
	formname.refresh.value = "on";
	formname.submit();
    }
    return;
  }

//===================== Script to view submitted by ==================
  function viewSubmitter(submitter) {
    document.SCORE.refresh.value = "on";
    document.SCORE.NCT.value = "1";
    document.SCORE.unamedom0.value = submitter;
    document.SCORE.submit();
    return;
  }

//===================== Script to add keyword(s) ==================
  function getSel() {
    if (document.getSelection) txt = document.getSelection();
    else if (document.selection) txt = document.selection.createRange().text;
    else return;
    var cleantxt = txt.replace(new RegExp('([\\f\\n\\r\\t\\v ])+', 'g')," ");
    if (cleantxt=="") {
	alert("Please select a word or group of words from document and then click this link.");
	return;
    }
    var nret = prompt("Add selection to keyword list? Edit if desired.",cleantxt);
    if (nret==null) return;
    document.SCORE.keywords.value = document.SCORE.keywords.value+" "+nret;
    if (document.SCORE.keywords.value != "") {
	document.SCORE.refresh.value = "on";
	document.SCORE.submit();
    }
    return;
  }

//====================== Script for composing message ==============
   // preload images
   img1 = new Image();
   img1.src = "$iconpath/mailbkgrd.gif";
   img2 = new Image();
   img2.src = "$iconpath/mailto.gif";

  function msgCenter(msgform,usrctr,fullname) {
    var Nmsg  = msgform.savemsgN.value;
    savedMsgHeader(Nmsg,usrctr,fullname);
    var subject = msgform.msgsub.value;
    var msgchk = document.SCORE["includemsg"+usrctr].value;
    re = /msgsub/;
    var shwsel = "";
    if (re.test(msgchk)) { shwsel = "checked" }
    subject = (document.SCORE.shownSub.value == 0 ? checkEntities(subject) : subject);
    displaySubject(checkEntities(subject),shwsel);
    for (var i=1; i<=Nmsg; i++) {
	var testmsg = "savemsg"+i+",";
	re = new RegExp(testmsg,"g");
	shwsel = "";
	if (re.test(msgchk)) { shwsel = "checked" }
	var message = document.SCORE["savemsg"+i].value;
	message = (document.SCORE["shownOnce"+i].value == 0 ? checkEntities(message) : message);
	displaySavedMsg(i,message,shwsel); //I do not get it. w/o checkEntities on saved messages,
	                                   //any &lt; is already converted to <, etc. However, only once!!
    }
    newmsg = document.SCORE["newmsg"+usrctr].value;
    shwsel = "";
    re = /newmsg/;
    if (re.test(msgchk)) { shwsel = "checked" }
    newMsg(newmsg,shwsel);
    msgTail(); 
    return;
  }

  function checkEntities(strx) {
    if (strx.length == 0) return strx;
    var orgStr = ["&", "<", ">", '"']; 
    var newStr = ["&amp;", "&lt;", "&gt;", "&quot;"];
    var counter = 0;
    while (counter < 4) {
	strx = strReplace(strx,orgStr[counter],newStr[counter]);
	counter++;
    }
    return strx;
  }

  function strReplace(strx, orgStr, newStr) {
    return strx.split(orgStr).join(newStr);
  }

  function savedMsgHeader(Nmsg,usrctr,fullname) {
    var height = 70*Nmsg+250;
    var scrollbar = "no";
    if (height > 600) {
	height = 600;
	scrollbar = "yes";
    }
    var xpos = (screen.width-600)/2;
    xpos = (xpos < 0) ? '0' : xpos;
    var ypos = (screen.height-height)/2-30;
    ypos = (ypos < 0) ? '0' : ypos;

    pWin = window.open('', 'MessageCenter', 'resizable=yes,toolbar=no,location=no,scrollbars='+scrollbar+',screenx='+xpos+',screeny='+ypos+',width=600,height='+height);
    pWin.focus();
    pDoc = pWin.document;
    pDoc.$docopen;
    pDoc.write('$start_page_msg_central');

    pDoc.write("<form action=\\"inactive\\" name=\\"msgcenter\\">");
    pDoc.write("<input value=\\""+usrctr+"\\" name=\\"usrctr\\" type=\\"hidden\\">");
    pDoc.write("<h3><span class=\\"LC_info\\">&nbsp;Compose Message for \"+fullname+\"<\\/span><\\/h3><br /><br />");

    pDoc.write("<table border=0 width=100%><tr><td bgcolor=\\"#777777\\">");
    pDoc.write("<table border=0 width=100%><tr bgcolor=\\"#ddffff\\">");
    pDoc.write("<td><b>Type<\\/b><\\/td><td><b>Include<\\/b><\\/td><td><b>Message<\\/td><\\/tr>");
}
    function displaySubject(msg,shwsel) {
    pDoc = pWin.document;
    pDoc.write("<tr bgcolor=\\"#ffffdd\\">");
    pDoc.write("<td>Subject<\\/td>");
    pDoc.write("<td align=\\"center\\"><input name=\\"subchk\\" type=\\"checkbox\\"" +shwsel+"><\\/td>");
    pDoc.write("<td><input name=\\"msgsub\\" type=\\"text\\" value=\\""+msg+"\\"size=\\"60\\" maxlength=\\"80\\"><\\/td><\\/tr>");
}

  function displaySavedMsg(ctr,msg,shwsel) {
    pDoc = pWin.document;
    pDoc.write("<tr bgcolor=\\"#ffffdd\\">");
    pDoc.write("<td align=\\"center\\">"+ctr+"<\\/td>");
    pDoc.write("<td align=\\"center\\"><input name=\\"msgn"+ctr+"\\" type=\\"checkbox\\"" +shwsel+"><\\/td>");
    pDoc.write("<td><textarea name=\\"msg"+ctr+"\\" cols=\\"60\\" rows=\\"3\\">"+msg+"<\\/textarea><\\/td><\\/tr>");
}

  function newMsg(newmsg,shwsel) {
    pDoc = pWin.document;
    pDoc.write("<tr bgcolor=\\"#ffffdd\\">");
    pDoc.write("<td align=\\"center\\">New<\\/td>");
    pDoc.write("<td align=\\"center\\"><input name=\\"newmsgchk\\" type=\\"checkbox\\"" +shwsel+"><\\/td>");
    pDoc.write("<td><textarea name=\\"newmsg\\" cols=\\"60\\" rows=\\"3\\" onchange=\\"javascript:this.form.newmsgchk.checked=true\\" >"+newmsg+"<\\/textarea><\\/td><\\/tr>");
}

  function msgTail() {
    pDoc = pWin.document;
    pDoc.write("<\\/table>");
    pDoc.write("<\\/td><\\/tr><\\/table>&nbsp;");
    pDoc.write("<input type=\\"button\\" value=\\"Save\\" onClick=\\"javascript:checkInput()\\">&nbsp;&nbsp;");
    pDoc.write("<input type=\\"button\\" value=\\"Cancel\\" onClick=\\"self.close()\\"><br /><br />");
    pDoc.write("<\\/form>");
    pDoc.write('$end_page_msg_central');
    pDoc.close();
}

//====================== Script for keyword highlight options ==============
  function kwhighlight() {
    var kwclr    = document.SCORE.kwclr.value;
    var kwsize   = document.SCORE.kwsize.value;
    var kwstyle  = document.SCORE.kwstyle.value;
    var redsel = "";
    var grnsel = "";
    var blusel = "";
    if (kwclr=="red")   {var redsel="checked"};
    if (kwclr=="green") {var grnsel="checked"};
    if (kwclr=="blue")  {var blusel="checked"};
    var sznsel = "";
    var sz1sel = "";
    var sz2sel = "";
    if (kwsize=="0")  {var sznsel="checked"};
    if (kwsize=="+1") {var sz1sel="checked"};
    if (kwsize=="+2") {var sz2sel="checked"};
    var synsel = "";
    var syisel = "";
    var sybsel = "";
    if (kwstyle=="")    {var synsel="checked"};
    if (kwstyle=="<i>") {var syisel="checked"};
    if (kwstyle=="<b>") {var sybsel="checked"};
    highlightCentral();
    highlightbody('red','red',redsel,'0','normal',sznsel,'','normal',synsel);
    highlightbody('green','green',grnsel,'+1','+1',sz1sel,'<i>','italic',syisel);
    highlightbody('blue','blue',blusel,'+2','+2',sz2sel,'<b>','bold',sybsel);
    highlightend();
    return;
  }

  function highlightCentral() {
//    if (window.hwdWin) window.hwdWin.close();
    var xpos = (screen.width-400)/2;
    xpos = (xpos < 0) ? '0' : xpos;
    var ypos = (screen.height-330)/2-30;
    ypos = (ypos < 0) ? '0' : ypos;

    hwdWin = window.open('', 'KeywordHighlightCentral', 'resizeable=yes,toolbar=no,location=no,scrollbars=no,width=400,height=300,screenx='+xpos+',screeny='+ypos);
    hwdWin.focus();
    var hDoc = hwdWin.document;
    hDoc.$docopen;
    hDoc.write('$start_page_highlight_central');
    hDoc.write("<form action=\\"inactive\\" name=\\"hlCenter\\">");
    hDoc.write("<h3><span class=\\"LC_info\\">&nbsp;Keyword Highlight Options<\\/span><\\/h3><br /><br />");

    hDoc.write("<table border=0 width=100%><tr><td bgcolor=\\"#777777\\">");
    hDoc.write("<table border=0 width=100%><tr bgcolor=\\"#ddffff\\">");
    hDoc.write("<td><b>Text Color<\\/b><\\/td><td><b>Font Size<\\/b><\\/td><td><b>Font Style<\\/td><\\/tr>");
  }

  function highlightbody(clrval,clrtxt,clrsel,szval,sztxt,szsel,syval,sytxt,sysel) { 
    var hDoc = hwdWin.document;
    hDoc.write("<tr bgcolor=\\"#ffffdd\\">");
    hDoc.write("<td align=\\"left\\">");
    hDoc.write("<input name=\\"kwdclr\\" type=\\"radio\\" value=\\""+clrval+"\\" "+clrsel+">&nbsp;"+clrtxt+"<\\/td>");
    hDoc.write("<td align=\\"left\\">");
    hDoc.write("<input name=\\"kwdsize\\" type=\\"radio\\" value=\\""+szval+"\\" "+szsel+">&nbsp;"+sztxt+"<\\/td>");
    hDoc.write("<td align=\\"left\\">");
    hDoc.write("<input name=\\"kwdstyle\\" type=\\"radio\\" value=\\""+syval+"\\" "+sysel+">&nbsp;"+sytxt+"<\\/td>");
    hDoc.write("<\\/tr>");
  }

  function highlightend() { 
    var hDoc = hwdWin.document;
    hDoc.write("<\\/table>");
    hDoc.write("<\\/td><\\/tr><\\/table>&nbsp;");
    hDoc.write("<input type=\\"button\\" value=\\"Save\\" onClick=\\"javascript:updateChoice(1)\\">&nbsp;&nbsp;");
    hDoc.write("<input type=\\"button\\" value=\\"Cancel\\" onClick=\\"self.close()\\"><br /><br />");
    hDoc.write("<\\/form>");
    hDoc.write('$end_page_highlight_central');
    hDoc.close();
  }

</script>
SUBJAVASCRIPT
}

sub get_increment {
    my $increment = $env{'form.increment'};
    if ($increment != 1 && $increment != .5 && $increment != .25 &&
        $increment != .1) {
        $increment = 1;
    }
    return $increment;
}

#--- displays the grading box, used in essay type problem and grading by page/sequence
sub gradeBox {
    my ($request,$symb,$uname,$udom,$counter,$partid,$record) = @_;
    my $checkIcon = '<img alt="'.&mt('Check Mark').
	'" src="'.&Apache::loncommon::lonhttpdurl($request->dir_config('lonIconsURL').'/check.gif').'" height="16" border="0" />';
    my $wgt    = &Apache::lonnet::EXT('resource.'.$partid.'.weight',$symb,$udom,$uname);
    my $wgtmsg = ($wgt > 0) ? &mt('(problem weight)') 
                           : '<span class="LC_info">'.&mt('problem weight assigned by computer').'</span>';
    $wgt       = ($wgt > 0 ? $wgt : '1');
    my $score  = ($$record{'resource.'.$partid.'.awarded'} eq '' ?
		  '' : &compute_points($$record{'resource.'.$partid.'.awarded'},$wgt));
    my $result='<input type="hidden" name="WGT'.$counter.'_'.$partid.'" value="'.$wgt.'" />'."\n";
    my $display_part= &get_display_part($partid,$symb);
    my %last_resets = &get_last_resets($symb,$env{'request.course.id'},
				       [$partid]);
    my $aggtries = $$record{'resource.'.$partid.'.tries'};
    if ($last_resets{$partid}) {
        $aggtries = &get_num_tries($record,$last_resets{$partid},$partid);
    }
    $result.='<table border="0"><tr>';
    my $ctr = 0;
    my $thisweight = 0;
    my $increment = &get_increment();

    my $radio.='<table border="0"><tr>'."\n";  # display radio buttons in a nice table 10 across
    while ($thisweight<=$wgt) {
	$radio.= '<td><span style="white-space: nowrap;"><label><input type="radio" name="RADVAL'.$counter.'_'.$partid.'" '.
	    'onclick="javascript:writeBox(this.form,\''.$counter.'_'.$partid.'\','.
	    $thisweight.')" value="'.$thisweight.'" '.
	    ($score eq $thisweight ? 'checked="checked"':'').' /> '.$thisweight."</label></span></td>\n";
	$radio.=(($ctr+1)%10 == 0 ? '</tr><tr>' : '');
        $thisweight += $increment;
	$ctr++;
    }
    $radio.='</tr></table>';

    my $line.='<input type="text" name="GD_BOX'.$counter.'_'.$partid.'"'.
	($score ne ''? ' value = "'.$score.'"':'').' size="4" '.
	'onChange="javascript:updateRadio(this.form,\''.$counter.'_'.$partid.'\','.
	$wgt.')" /></td>'."\n";
    $line.='<td>/'.$wgt.' '.$wgtmsg.
	($$record{'resource.'.$partid.'.solved'} eq 'correct_by_student' ? '&nbsp;'.$checkIcon : '').
	' </td><td>'."\n";
    $line.='<select name="GD_SEL'.$counter.'_'.$partid.'" '.
	'onChange="javascript:clearRadBox(this.form,\''.$counter.'_'.$partid.'\')" >'."\n";
    if ($$record{'resource.'.$partid.'.solved'} eq 'excused') {
	$line.='<option></option>'.
	    '<option value="excused" selected="selected">'.&mt('excused').'</option>';
    } else {
	$line.='<option selected="selected"></option>'.
	    '<option value="excused" >'.&mt('excused').'</option>';
    }
    $line.='<option value="reset status">'.&mt('reset status').'</option></select>'."\n";


    $result .= 
	&mt('<td><b>Part:</b></td><td>[_1]</td><td><b>Points:</b></td><td>[_2]</td><td>or</td><td>[_3]</td>',$display_part,$radio,$line);

    
    $result.='</tr></table>'."\n";
    $result.='<input type="hidden" name="stores'.$counter.'_'.$partid.'" value="" />'."\n".
	'<input type="hidden" name="oldpts'.$counter.'_'.$partid.'" value="'.$score.'" />'."\n".
	'<input type="hidden" name="solved'.$counter.'_'.$partid.'" value="'.
	$$record{'resource.'.$partid.'.solved'}.'" />'."\n".
        '<input type="hidden" name="totaltries'.$counter.'_'.$partid.'" value="'.
        $$record{'resource.'.$partid.'.tries'}.'" />'."\n".
        '<input type="hidden" name="aggtries'.$counter.'_'.$partid.'" value="'.
        $aggtries.'" />'."\n";
    $result.=&handback_box($symb,$uname,$udom,$counter,$partid,$record);
    return $result;
}

sub handback_box {
    my ($symb,$uname,$udom,$counter,$partid,$record) = @_;
    my ($partlist,$handgrade,$responseType) = &response_type($symb);
    my (@respids);
     my @part_response_id = &flatten_responseType($responseType);
    foreach my $part_response_id (@part_response_id) {
    	my ($part,$resp) = @{ $part_response_id };
        if ($part eq $partid) {
            push(@respids,$resp);
        }
    }
    my $result;
    foreach my $respid (@respids) {
	my $prefix = $counter.'_'.$partid.'_'.$respid.'_';
	my $files=&get_submitted_files($udom,$uname,$partid,$respid,$record);
	next if (!@$files);
	my $file_counter = 1;
	foreach my $file (@$files) {
	    if ($file =~ /\/portfolio\//) {
    	        my ($file_path, $file_disp) = ($file =~ m|(.+/)(.+)$|);
    	        my ($name,$version,$ext) = &file_name_version_ext($file_disp);
    	        $file_disp = "$name.$ext";
    	        $file = $file_path.$file_disp;
    	        $result.=&mt('Return commented version of [_1] to student.',
    			 '<span class="LC_filename">'.$file_disp.'</span>');
    	        $result.='<input type="file"   name="'.$prefix.'returndoc'.$file_counter.'" />'."\n";
    	        $result.='<input type="hidden" name="'.$prefix.'origdoc'.$file_counter.'" value="'.$file.'" /><br />';
    	        $result.='('.&mt('File will be uploaded when you click on Save &amp; Next below.').')<br />';
    	        $file_counter++;
	    }
	}
    }
    return $result;    
}

sub show_problem {
    my ($request,$symb,$uname,$udom,$removeform,$viewon,$mode,$form) = @_;
    my $rendered;
    my %form = ((ref($form) eq 'HASH')? %{$form} : ());
    &Apache::lonxml::remember_problem_counter();
    if ($mode eq 'both' or $mode eq 'text') {
	$rendered=&Apache::loncommon::get_student_view($symb,$uname,$udom,
						       $env{'request.course.id'},
						       undef,\%form);
    }
    if ($removeform) {
	$rendered=~s|<form(.*?)>||g;
	$rendered=~s|</form>||g;
	$rendered=~s|(<input[^>]*name\s*=\s*"?)(\w+)("?)|$1would_have_been_$2$3|g;
    }
    my $companswer;
    if ($mode eq 'both' or $mode eq 'answer') {
	&Apache::lonxml::restore_problem_counter();
	$companswer=
	    &Apache::loncommon::get_student_answers($symb,$uname,$udom,
						    $env{'request.course.id'},
						    %form);
    }
    if ($removeform) {
	$companswer=~s|<form(.*?)>||g;
	$companswer=~s|</form>||g;
	$companswer=~s|name="submit"|name="would_have_been_submit"|g;
    }
    $rendered=
	'<div class="LC_grade_show_problem_header">'.
	&mt('View of the problem').
	'</div><div class="LC_grade_show_problem_problem">'.
	$rendered.
	'</div>';
    $companswer=
	'<div class="LC_grade_show_problem_header">'.
	&mt('Correct answer').
	'</div><div class="LC_grade_show_problem_problem">'.
	$companswer.
	'</div>';
    my $result;
    if ($mode eq 'both') {
	$result=$rendered.$companswer;
    } elsif ($mode eq 'text') {
	$result=$rendered;
    } elsif ($mode eq 'answer') {
	$result=$companswer;
    }
    $result='<div class="LC_grade_show_problem">'.$result.'</div>';
    return $result;
}

sub files_exist {
    my ($r, $symb) = @_;
    my @students = &Apache::loncommon::get_env_multiple('form.stuinfo');

    foreach my $student (@students) {
        my ($uname,$udom,$fullname) = split(/:/,$student);
        my %record = &Apache::lonnet::restore($symb,$env{'request.course.id'},
					      $udom,$uname);
        my ($string,$timestamp)= &get_last_submission(\%record);
        foreach my $submission (@$string) {
            my ($partid,$respid) =
		($submission =~ /^resource\.([^\.]*)\.([^\.]*)\.submission/);
            my $files=&get_submitted_files($udom,$uname,$partid,$respid,
					   \%record);
            return 1 if (@$files);
        }
    }
    return 0;
}

sub download_all_link {
    my ($r,$symb) = @_;
    my $all_students = 
	join("\n", &Apache::loncommon::get_env_multiple('form.stuinfo'));

    my $parts =
	join("\n",&Apache::loncommon::get_env_multiple('form.vPart'));

    my $identifier = &Apache::loncommon::get_cgi_id();
    &Apache::lonnet::appenv({'cgi.'.$identifier.'.students' => $all_students,
                             'cgi.'.$identifier.'.symb' => $symb,
                             'cgi.'.$identifier.'.parts' => $parts,});
    $r->print('<a href="/cgi-bin/multidownload.pl?'.$identifier.'">'.
	      &mt('Download All Submitted Documents').'</a>');
    return
}

sub build_section_inputs {
    my $section_inputs;
    if ($env{'form.section'} eq '') {
        $section_inputs .= '<input type="hidden" name="section" value="all" />'."\n";
    } else {
        my @sections = &Apache::loncommon::get_env_multiple('form.section');
        foreach my $section (@sections) {
            $section_inputs .= '<input type="hidden" name="section" value="'.$section.'" />'."\n";
        }
    }
    return $section_inputs;
}

# --------------------------- show submissions of a student, option to grade 
sub submission {
    my ($request,$counter,$total) = @_;
    my ($uname,$udom)     = ($env{'form.student'},$env{'form.userdom'});
    $udom = ($udom eq '' ? $env{'user.domain'} : $udom); #has form.userdom changed for a student?
    my $usec = &Apache::lonnet::getsection($udom,$uname,$env{'request.course.id'});
    $env{'form.fullname'} = &Apache::loncommon::plainname($uname,$udom,'lastname') if $env{'form.fullname'} eq '';
    my $symb = &get_symb($request); 
    if ($symb eq '') { $request->print("Unable to handle ambiguous references:."); return ''; }

    if (!&canview($usec)) {
	$request->print('<span class="LC_warning">Unable to view requested student.('.
			$uname.':'.$udom.' in section '.$usec.' in course id '.
			$env{'request.course.id'}.')</span>');
	$request->print(&show_grading_menu_form($symb));
	return;
    }

    if (!$env{'form.lastSub'}) { $env{'form.lastSub'} = 'datesub'; }
    if (!$env{'form.vProb'}) { $env{'form.vProb'} = 'yes'; }
    if (!$env{'form.vAns'}) { $env{'form.vAns'} = 'yes'; }
    my $last = ($env{'form.lastSub'} eq 'last' ? 'last' : '');
    my $checkIcon = '<img alt="'.&mt('Check Mark').
	'" src="'.$request->dir_config('lonIconsURL').
	'/check.gif" height="16" border="0" />';

    my %old_essays;
    # header info
    if ($counter == 0) {
	&sub_page_js($request);
	&sub_page_kw_js($request) if ($env{'form.handgrade'} eq 'yes');
	$env{'form.probTitle'} = $env{'form.probTitle'} eq '' ? 
	    &Apache::lonnet::gettitle($symb) : $env{'form.probTitle'};
	if ($env{'form.handgrade'} eq 'yes' && &files_exist($request, $symb)) {
	    &download_all_link($request, $symb);
	}
	$request->print('<h3>&nbsp;<span class="LC_info">'.&mt('Submission Record').'</span></h3>'."\n".
			'<h4>&nbsp;'.&mt('<b>Resource: </b> [_1]',$env{'form.probTitle'}).'</h4>'."\n");

	# option to display problem, only once else it cause problems 
        # with the form later since the problem has a form.
	if ($env{'form.vProb'} eq 'yes' or $env{'form.vAns'} eq 'yes') {
	    my $mode;
	    if ($env{'form.vProb'} eq 'yes' && $env{'form.vAns'} eq 'yes') {
		$mode='both';
	    } elsif ($env{'form.vProb'} eq 'yes') {
		$mode='text';
	    } elsif ($env{'form.vAns'} eq 'yes') {
		$mode='answer';
	    }
	    &Apache::lonxml::clear_problem_counter();
	    $request->print(&show_problem($request,$symb,$uname,$udom,0,1,$mode));
	}

	# kwclr is the only variable that is guaranteed to be non blank 
        # if this subroutine has been called once.
	my %keyhash = ();
	if ($env{'form.kwclr'} eq '' && $env{'form.handgrade'} eq 'yes') {
	    %keyhash = &Apache::lonnet::dump('nohist_handgrade',
					     $env{'course.'.$env{'request.course.id'}.'.domain'},
					     $env{'course.'.$env{'request.course.id'}.'.num'});

	    my $loginuser = $env{'user.name'}.':'.$env{'user.domain'};
	    $env{'form.keywords'} = $keyhash{$symb.'_keywords'} ne '' ? $keyhash{$symb.'_keywords'} : '';
	    $env{'form.kwclr'}    = $keyhash{$loginuser.'_kwclr'} ne '' ? $keyhash{$loginuser.'_kwclr'} : 'red';
	    $env{'form.kwsize'}   = $keyhash{$loginuser.'_kwsize'} ne '' ? $keyhash{$loginuser.'_kwsize'} : '0';
	    $env{'form.kwstyle'}  = $keyhash{$loginuser.'_kwstyle'} ne '' ? $keyhash{$loginuser.'_kwstyle'} : '';
	    $env{'form.msgsub'}   = $keyhash{$symb.'_subject'} ne '' ? 
		$keyhash{$symb.'_subject'} : $env{'form.probTitle'};
	    $env{'form.savemsgN'} = $keyhash{$symb.'_savemsgN'} ne '' ? $keyhash{$symb.'_savemsgN'} : '0';
	}
	my $overRideScore = $env{'form.overRideScore'} eq '' ? 'no' : $env{'form.overRideScore'};
	my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
	$request->print('<form action="/adm/grades" method="post" name="SCORE" enctype="multipart/form-data">'."\n".
			'<input type="hidden" name="command"    value="handgrade" />'."\n".
			'<input type="hidden" name="saveState"  value="'.$env{'form.saveState'}.'" />'."\n".
			'<input type="hidden" name="Status"     value="'.$stu_status.'" />'."\n".
			'<input type="hidden" name="overRideScore" value="'.$overRideScore.'" />'."\n".
			'<input type="hidden" name="probTitle"  value="'.$env{'form.probTitle'}.'" />'."\n".
			'<input type="hidden" name="refresh"    value="off" />'."\n".
			'<input type="hidden" name="studentNo"  value="" />'."\n".
			'<input type="hidden" name="gradeOpt"   value="" />'."\n".
			'<input type="hidden" name="symb"       value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
			'<input type="hidden" name="showgrading" value="'.$env{'form.showgrading'}.'" />'."\n".
			'<input type="hidden" name="vProb"      value="'.$env{'form.vProb'}.'" />'."\n".
			'<input type="hidden" name="vAns"       value="'.$env{'form.vAns'}.'" />'."\n".
			'<input type="hidden" name="lastSub"    value="'.$env{'form.lastSub'}.'" />'."\n".
			&build_section_inputs().
			'<input type="hidden" name="submitonly" value="'.$env{'form.submitonly'}.'" />'."\n".
			'<input type="hidden" name="handgrade"  value="'.$env{'form.handgrade'}.'" />'."\n".
			'<input type="hidden" name="NCT"'.
			' value="'.($env{'form.NTSTU'} ne '' ? $env{'form.NTSTU'} : $total+1).'" />'."\n");
	if ($env{'form.handgrade'} eq 'yes') {
	    $request->print('<input type="hidden" name="keywords" value="'.$env{'form.keywords'}.'" />'."\n".
			    '<input type="hidden" name="kwclr"    value="'.$env{'form.kwclr'}.'" />'."\n".
			    '<input type="hidden" name="kwsize"   value="'.$env{'form.kwsize'}.'" />'."\n".
			    '<input type="hidden" name="kwstyle"  value="'.$env{'form.kwstyle'}.'" />'."\n".
			    '<input type="hidden" name="msgsub"   value="'.$env{'form.msgsub'}.'" />'."\n".
			    '<input type="hidden" name="shownSub" value="0" />'."\n".
			    '<input type="hidden" name="savemsgN" value="'.$env{'form.savemsgN'}.'" />'."\n");
	    foreach my $partid (&Apache::loncommon::get_env_multiple('form.vPart')) {
		$request->print('<input type="hidden" name="vPart" value="'.$partid.'" />'."\n");
	    }
	}
	
	my ($cts,$prnmsg) = (1,'');
	while ($cts <= $env{'form.savemsgN'}) {
	    $prnmsg.='<input type="hidden" name="savemsg'.$cts.'" value="'.
		(!exists($keyhash{$symb.'_savemsg'.$cts}) ? 
		 &Apache::lonfeedback::clear_out_html($env{'form.savemsg'.$cts}) :
		 &Apache::lonfeedback::clear_out_html($keyhash{$symb.'_savemsg'.$cts})).
		'" />'."\n".
		'<input type="hidden" name="shownOnce'.$cts.'" value="0" />'."\n";
	    $cts++;
	}
	$request->print($prnmsg);

	if ($env{'form.handgrade'} eq 'yes' && $env{'form.showgrading'} eq 'yes') {
#
# Print out the keyword options line
#
	    $request->print(<<KEYWORDS);
&nbsp;<b>Keyword Options:</b>&nbsp;
<a href="javascript:keywords(document.SCORE);" target="_self">List</a>&nbsp; &nbsp;
<a href="#" onMouseDown="javascript:getSel(); return false"
 CLASS="page">Paste Selection to List</a>&nbsp; &nbsp;
<a href="javascript:kwhighlight();" target="_self">Highlight Attribute</a><br /><br />
KEYWORDS
#
# Load the other essays for similarity check
#
            my (undef,undef,$essayurl) = &Apache::lonnet::decode_symb($symb);
	    my ($adom,$aname,$apath)=($essayurl=~/^($LONCAPA::domain_re)\/($LONCAPA::username_re)\/(.*)$/);
	    $apath=&escape($apath);
	    $apath=~s/\W/\_/gs;
	    %old_essays=&Apache::lonnet::dump('nohist_essay_'.$apath,$adom,$aname);
        }
    }

# This is where output for one specific student would start
    my $add_class = ($counter%2) ? 'LC_grade_show_user_odd_row' : '';
    $request->print("\n\n".
                    '<div class="LC_grade_show_user '.$add_class.'">'.
		    '<div class="LC_grade_user_name">'.&nameUserString(undef,$env{'form.fullname'},$uname,$udom).'</div>'.
		    '<div class="LC_grade_show_user_body">'."\n");

    if ($env{'form.vProb'} eq 'all' or $env{'form.vAns'} eq 'all') {
	my $mode;
	if ($env{'form.vProb'} eq 'all' && $env{'form.vAns'} eq 'all') {
	    $mode='both';
	} elsif ($env{'form.vProb'} eq 'all' ) {
	    $mode='text';
	} elsif ($env{'form.vAns'} eq 'all') {
	    $mode='answer';
	}
	&Apache::lonxml::clear_problem_counter();
	$request->print(&show_problem($request,$symb,$uname,$udom,1,1,$mode,{'request.prefix' => 'ctr'.$counter}));
    }

    my %record = &Apache::lonnet::restore($symb,$env{'request.course.id'},$udom,$uname);
    my ($partlist,$handgrade,$responseType) = &response_type($symb);

    # Display student info
    $request->print(($counter == 0 ? '' : '<br />'));
    my $result='<div class="LC_grade_submissions">';
    
    $result.='<div class="LC_grade_submissions_header">';
    $result.= &mt('Submissions');
    $result.='<input type="hidden" name="name'.$counter.
	'" value="'.$env{'form.fullname'}.'" />'."\n";
    if ($env{'form.handgrade'} eq 'no') {
	$result.='<span class="LC_grade_check_note">'.
	    &mt('Part(s) graded correct by the computer is marked with a [_1] symbol.',$checkIcon)."</span>\n";

    }



    # If any part of the problem is an essay-response (handgraded), then check for collaborators
    my $fullname;
    my $col_fullnames = [];
    if ($env{'form.handgrade'} eq 'yes') {
	(my $sub_result,$fullname,$col_fullnames)=
	    &check_collaborators($symb,$uname,$udom,\%record,$handgrade,
				 $counter);
	$result.=$sub_result;
    }
    $request->print($result."\n");
    $request->print('</div>'."\n");
    # print student answer/submission
    # Options are (1) Handgaded submission only
    #             (2) Last submission, includes submission that is not handgraded 
    #                  (for multi-response type part)
    #             (3) Last submission plus the parts info
    #             (4) The whole record for this student
    if ($env{'form.lastSub'} =~ /^(lastonly|hdgrade)$/) {
	my ($string,$timestamp)= &get_last_submission(\%record);
	
	my $lastsubonly;

	if ($$timestamp eq '') {
	    $lastsubonly.='<div class="LC_grade_submissions_body">'.$$string[0].'</div>'; 
	} else {
	    $lastsubonly = '<div class="LC_grade_submissions_body"> <b>Date Submitted:</b> '.$$timestamp."\n";

	    my %seenparts;
	    my @part_response_id = &flatten_responseType($responseType);
	    foreach my $part (@part_response_id) {
		next if ($env{'form.lastSub'} eq 'hdgrade' 
			 && $$handgrade{$$part[0].'_'.$$part[1]} ne 'yes');

		my ($partid,$respid) = @{ $part };
		my $display_part=&get_display_part($partid,$symb);
		if ($env{"form.$uname:$udom:$partid:submitted_by"}) {
		    if (exists($seenparts{$partid})) { next; }
		    $seenparts{$partid}=1;
		    my $submitby='<b>Part:</b> '.$display_part.
			' <b>Collaborative submission by:</b> '.
			'<a href="javascript:viewSubmitter(\''.
			$env{"form.$uname:$udom:$partid:submitted_by"}.
			'\');" target="_self">'.
			$$fullname{$env{"form.$uname:$udom:$partid:submitted_by"}}.'</a><br />';
		    $request->print($submitby);
		    next;
		}
		my $responsetype = $responseType->{$partid}->{$respid};
		if (!exists($record{"resource.$partid.$respid.submission"})) {
		    $lastsubonly.="\n".'<div class="LC_grade_submission_part"><b>Part:</b> '.
			$display_part.' <span class="LC_internal_info">( ID '.$respid.
			' )</span>&nbsp; &nbsp;'.
			'<span class="LC_warning">'.&mt('Nothing submitted - no attempts').'</span><br /><br /></div>';
		    next;
		}
		foreach my $submission (@$string) {
		    my ($partid,$respid) = ($submission =~ /^resource\.([^\.]*)\.([^\.]*)\.submission/);
		    if (join('_',@{$part}) ne ($partid.'_'.$respid)) { next; }
		    my ($ressub,$subval) = split(/:/,$submission,2);
		    # Similarity check
		    my $similar='';
		    if($env{'form.checkPlag'}){
			my ($oname,$odom,$ocrsid,$oessay,$osim)=
			    &most_similar($uname,$udom,$subval,\%old_essays);
			if ($osim) {
			    $osim=int($osim*100.0);
			    my %old_course_desc = 
				&Apache::lonnet::coursedescription($ocrsid,
								   {'one_time' => 1});

			    $similar="<hr /><h3><span class=\"LC_warning\">".
				&mt('Essay is [_1]% similar to an essay by [_2] ([_3]:[_4]) in course [_5] (course id [_6]:[_7])',
				    $osim,
				    &Apache::loncommon::plainname($oname,$odom),
				    $oname,$odom,
				    $old_course_desc{'description'},
				    $old_course_desc{'num'},
				    $old_course_desc{'domain'}).
				'</span></h3><blockquote><i>'.
				&keywords_highlight($oessay).
				'</i></blockquote><hr />';
			}
		    }
		    my $order=&get_order($partid,$respid,$symb,$uname,$udom);
		    if ($env{'form.lastSub'} eq 'lastonly' || 
			($env{'form.lastSub'} eq 'hdgrade' && 
			 $$handgrade{$$part[0].'_'.$$part[1]} eq 'yes')) {
			my $display_part=&get_display_part($partid,$symb);
			$lastsubonly.='<div class="LC_grade_submission_part"><b>Part:</b> '.
			    $display_part.' <span class="LC_internal_info">( ID '.$respid.
			    ' )</span>&nbsp; &nbsp;';
			my $files=&get_submitted_files($udom,$uname,$partid,$respid,\%record);
			if (@$files) {
			    $lastsubonly.='<br /><span class="LC_warning">'.&mt('Like all files provided by users, this file may contain virusses').'</span><br />';
			    my $file_counter = 0;
			    foreach my $file (@$files) {
			        $file_counter++;
				&Apache::lonnet::allowuploaded('/adm/grades',$file);
				$lastsubonly.='<br /><a href="'.$file.'?rawmode=1" target="lonGRDs"><img src="'.&Apache::loncommon::icon($file).'" border=0"> '.$file.'</a>';
			    }
			    $lastsubonly.='<br />';
			}
			$lastsubonly.='<b>'.&mt('Submitted Answer:').' </b>'.
			    &cleanRecord($subval,$responsetype,$symb,$partid,
					 $respid,\%record,$order);
			if ($similar) {$lastsubonly.="<br /><br />$similar\n";}
			$lastsubonly.='</div>';
		    }
		}
	    }
	    $lastsubonly.='</div>'."\n";
	}
	$request->print($lastsubonly);
   } elsif ($env{'form.lastSub'} eq 'datesub') {
	my (undef,$responseType,undef,$parts) = &showResourceInfo($symb);
	$request->print(&displaySubByDates($symb,\%record,$parts,$responseType,$checkIcon,$uname,$udom));
    } elsif ($env{'form.lastSub'} =~ /^(last|all)$/) {
	$request->print(&Apache::loncommon::get_previous_attempt($symb,$uname,$udom,
								 $env{'request.course.id'},
								 $last,'.submission',
								 'Apache::grades::keywords_highlight'));
    }

    $request->print('<input type="hidden" name="unamedom'.$counter.'" value="'.$uname.':'
	.$udom.'" />'."\n");
    # return if view submission with no grading option
    if ($env{'form.showgrading'} eq '' || (!&canmodify($usec))) {
	my $toGrade.='<input type="button" value="Grade Student" '.
	    'onClick="javascript:checksubmit(this.form,\'Grade Student\',\''
	    .$counter.'\');" target="_self" /> &nbsp;'."\n" if (&canmodify($usec));
	$toGrade.='</div>'."\n";
	if (($env{'form.command'} eq 'submission') || 
	    ($env{'form.command'} eq 'processGroup' && $counter == $total)) {
	    $toGrade.='</form>'.&show_grading_menu_form($symb); 
	}
	$request->print($toGrade);
	return;
    } else {
	$request->print('</div>'."\n");
    }

    # essay grading message center
    if ($env{'form.handgrade'} eq 'yes') {
	my $result='<div class="LC_grade_message_center">';
    
	$result.='<div class="LC_grade_message_center_header">'.
	    &mt('Send Message').'</div><div class="LC_grade_message_center_body">';
	my ($lastname,$givenn) = split(/,/,$env{'form.fullname'});
	my $msgfor = $givenn.' '.$lastname;
	if (scalar(@$col_fullnames) > 0) {
	    my $lastone = pop(@$col_fullnames);
	    $msgfor .= ', '.(join ', ',@$col_fullnames).' and '.$lastone.'.';
	}
	$msgfor =~ s/\'/\\'/g; #' stupid emacs - no! javascript
	$result.='<input type="hidden" name="includemsg'.$counter.'" value="" />'."\n".
	    '<input type="hidden" name="newmsg'.$counter.'" value="" />'."\n";
	$result.='&nbsp;<a href="javascript:msgCenter(document.SCORE,'.$counter.
	    ',\''.$msgfor.'\');" target="_self">'.
	    &mt('Compose message to student').(scalar(@$col_fullnames) >= 1 ? 's' : '').'</a><label> ('.
	    &mt('incl. grades').' <input type="checkbox" name="withgrades'.$counter.'" /></label>)'.
	    '<img src="'.$request->dir_config('lonIconsURL').
	    '/mailbkgrd.gif" width="14" height="10" name="mailicon'.$counter.'" />'."\n".
	    '<br />&nbsp;('.
	    &mt('Message will be sent when you click on Save &amp; Next below.').")\n";
	$result.='</div></div>';
	$request->print($result);
    }

    my %seen = ();
    my @partlist;
    my @gradePartRespid;
    my @part_response_id = &flatten_responseType($responseType);
    $request->print('<div class="LC_grade_assign">'.
		    
		    '<div class="LC_grade_assign_header">'.
		    &mt('Assign Grades').'</div>'.
		    '<div class="LC_grade_assign_body">');
    foreach my $part_response_id (@part_response_id) {
    	my ($partid,$respid) = @{ $part_response_id };
	my $part_resp = join('_',@{ $part_response_id });
	next if ($seen{$partid} > 0);
	$seen{$partid}++;
	next if ($$handgrade{$part_resp} ne 'yes' 
		 && $env{'form.lastSub'} eq 'hdgrade');
	push @partlist,$partid;
	push @gradePartRespid,$partid.'.'.$respid;
	$request->print(&gradeBox($request,$symb,$uname,$udom,$counter,$partid,\%record));
    }
    $request->print('</div></div>');

    $request->print('<div class="LC_grade_info_links">');
    if ($perm{'vgr'}) {
	$request->print(
	    &Apache::loncommon::track_student_link(&mt('View recent activity'),
						   $uname,$udom,'check'));
    }
    if ($perm{'opa'}) {
	$request->print(
	    &Apache::loncommon::pprmlink(&mt('Set/Change parameters'),
					 $uname,$udom,$symb,'check'));
    }
    $request->print('</div>');

    $result='<input type="hidden" name="partlist'.$counter.
	'" value="'.(join ":",@partlist).'" />'."\n";
    $result.='<input type="hidden" name="gradePartRespid'.
	'" value="'.(join ":",@gradePartRespid).'" />'."\n" if ($counter == 0);
    my $ctr = 0;
    while ($ctr < scalar(@partlist)) {
	$result.='<input type="hidden" name="partid'.$counter.'_'.$ctr.'" value="'.
	    $partlist[$ctr].'" />'."\n";
	$ctr++;
    }
    $request->print($result.''."\n");

# Done with printing info for one student

    $request->print('</div>');#LC_grade_show_user_body
    $request->print('</div>');#LC_grade_show_user


    # print end of form
    if ($counter == $total) {
	my $endform='<table border="0"><tr><td>'."\n";
	$endform.='<input type="button" value="'.&mt('Save &amp; Next').'" '.
	    'onClick="javascript:checksubmit(this.form,\'Save & Next\','.
	    $total.','.scalar(@partlist).');" target="_self" /> &nbsp;'."\n";
	my $ntstu ='<select name="NTSTU">'.
	    '<option>1</option><option>2</option>'.
	    '<option>3</option><option>5</option>'.
	    '<option>7</option><option>10</option></select>'."\n";
	my $nsel = ($env{'form.NTSTU'} ne '' ? $env{'form.NTSTU'} : '1');
	$ntstu =~ s/<option>$nsel</<option selected="selected">$nsel</;
	$endform.=&mt('[_1]student(s)',$ntstu);
	$endform.='&nbsp;&nbsp;<input type="button" value="'.&mt('Previous').'" '.
	    'onClick="javascript:checksubmit(this.form,\'Previous\');" target="_self" /> &nbsp;'."\n".
	    '<input type="button" value="'.&mt('Next').'" '.
	    'onClick="javascript:checksubmit(this.form,\'Next\');" target="_self" /> &nbsp;';
	$endform.=&mt('(Next and Previous (student) do not save the scores.)')."\n" ;
        $endform.="<input type='hidden' value='".&get_increment().
            "' name='increment' />";
	$endform.='</td></tr></table></form>';
	$endform.=&show_grading_menu_form($symb);
	$request->print($endform);
    }
    return '';
}

sub check_collaborators {
    my ($symb,$uname,$udom,$record,$handgrade,$counter) = @_;
    my ($result,@col_fullnames);
    my ($classlist,undef,$fullname) = &getclasslist('all','0');
    foreach my $part (keys(%$handgrade)) {
	my $ncol = &Apache::lonnet::EXT('resource.'.$part.
					'.maxcollaborators',
					$symb,$udom,$uname);
	next if ($ncol <= 0);
	$part =~ s/\_/\./g;
	next if ($record->{'resource.'.$part.'.collaborators'} eq '');
	my (@good_collaborators, @bad_collaborators);
	foreach my $possible_collaborator
	    (split(/,?\s+/,$record->{'resource.'.$part.'.collaborators'})) { 
	    $possible_collaborator =~ s/[\$\^\(\)]//g;
	    next if ($possible_collaborator eq '');
	    my ($co_name,$co_dom) = split(/\@|:/,$possible_collaborator);
	    $co_dom = $udom if (! defined($co_dom) || $co_dom =~ /^domain$/i);
	    next if ($co_name eq $uname && $co_dom eq $udom);
	    # Doing this grep allows 'fuzzy' specification
	    my @matches = grep(/^\Q$co_name\E:\Q$co_dom\E$/i, 
			       keys(%$classlist));
	    if (! scalar(@matches)) {
		push(@bad_collaborators, $possible_collaborator);
	    } else {
		push(@good_collaborators, @matches);
	    }
	}
	if (scalar(@good_collaborators) != 0) {
	    $result.='<br />'.&mt('Collaborators: ');
	    foreach my $name (@good_collaborators) {
		my ($lastname,$givenn) = split(/,/,$$fullname{$name});
		push(@col_fullnames, $givenn.' '.$lastname);
		$result.=$fullname->{$name}.'&nbsp; &nbsp; &nbsp;';
	    }
	    $result.='<br />'."\n";
	    my ($part)=split(/\./,$part);
	    $result.='<input type="hidden" name="collaborator'.$counter.
		'" value="'.$part.':'.(join ':',@good_collaborators).'" />'.
		"\n";
	}
	if (scalar(@bad_collaborators) > 0) {
	    $result.='<div class="LC_warning">';
	    $result.=&mt('This student has submitted [quant,_1,invalid collaborator]: [_2]',scalar(@bad_collaborators),join(', ',@bad_collaborators));
	    $result .= '</div>';
	}         
	if (scalar(@bad_collaborators > $ncol)) {
	    $result .= '<div class="LC_warning">';
	    $result .= &mt('This student has submitted too many '.
		'collaborators.  Maximum is [_1].',$ncol);
	    $result .= '</div>';
	}
    }
    return ($result,$fullname,\@col_fullnames);
}

#--- Retrieve the last submission for all the parts
sub get_last_submission {
    my ($returnhash)=@_;
    my (@string,$timestamp);
    if ($$returnhash{'version'}) {
	my %lasthash=();
	my ($version);
	for ($version=1;$version<=$$returnhash{'version'};$version++) {
	    foreach my $key (sort(split(/\:/,
					$$returnhash{$version.':keys'}))) {
		$lasthash{$key}=$$returnhash{$version.':'.$key};
		$timestamp = 
		    scalar(localtime($$returnhash{$version.':timestamp'}));
	    }
	}
	foreach my $key (keys(%lasthash)) {
	    next if ($key !~ /\.submission$/);

	    my ($partid,$foo) = split(/submission$/,$key);
	    my $draft  = $lasthash{$partid.'awarddetail'} eq 'DRAFT' ?
		'<span class="LC_warning">Draft Copy</span> ' : '';
	    push(@string, join(':', $key, $draft.$lasthash{$key}));
	}
    }
    if (!@string) {
	$string[0] =
	    '<span class="LC_warning">Nothing submitted - no attempts.</span>';
    }
    return (\@string,\$timestamp);
}

#--- High light keywords, with style choosen by user.
sub keywords_highlight {
    my $string    = shift;
    my $size      = $env{'form.kwsize'} eq '0' ? '' : 'size='.$env{'form.kwsize'};
    my $styleon   = $env{'form.kwstyle'} eq ''  ? '' : $env{'form.kwstyle'};
    (my $styleoff = $styleon) =~ s/\</\<\//;
    my @keylist   = split(/[,\s+]/,$env{'form.keywords'});
    foreach my $keyword (@keylist) {
	$string =~ s/\b\Q$keyword\E(\b|\.)/<font color\=$env{'form.kwclr'} $size\>$styleon$keyword$styleoff<\/font>/gi;
    }
    return $string;
}

#--- Called from submission routine
sub processHandGrade {
    my ($request) = shift;
    my $symb   = &get_symb($request);
    my (undef,undef,$url) = &Apache::lonnet::decode_symb($symb);
    my $button = $env{'form.gradeOpt'};
    my $ngrade = $env{'form.NCT'};
    my $ntstu  = $env{'form.NTSTU'};
    my $cdom   = $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cnum   = $env{'course.'.$env{'request.course.id'}.'.num'};

    if ($button eq 'Save & Next') {
	my $ctr = 0;
	while ($ctr < $ngrade) {
	    my ($uname,$udom) = split(/:/,$env{'form.unamedom'.$ctr});
	    my ($errorflag,$pts,$wgt) = &saveHandGrade($request,$symb,$uname,$udom,$ctr);
	    if ($errorflag eq 'no_score') {
		$ctr++;
		next;
	    }
	    if ($errorflag eq 'not_allowed') {
		$request->print("<span class=\"LC_warning\">Not allowed to modify grades for $uname:$udom</span>");
		$ctr++;
		next;
	    }
	    my $includemsg = $env{'form.includemsg'.$ctr};
	    my ($subject,$message,$msgstatus) = ('','','');
	    my $restitle = &Apache::lonnet::gettitle($symb);
            my ($feedurl,$showsymb) =
		&get_feedurl_and_symb($symb,$uname,$udom);
	    my $messagetail;
	    if ($includemsg =~ /savemsg|newmsg\Q$ctr\E/) {
		$subject = $env{'form.msgsub'} if ($includemsg =~ /msgsub/);
		unless ($subject=~/\w/) { $subject=&mt('Grading Feedback'); }
		$subject.=' ['.$restitle.']';
		my (@msgnum) = split(/,/,$includemsg);
		foreach (@msgnum) {
		    $message.=$env{'form.'.$_} if ($_ =~ /savemsg|newmsg/ && $_ ne '');
		}
		$message =&Apache::lonfeedback::clear_out_html($message);
		if ($env{'form.withgrades'.$ctr}) {
		    $message.="\n\nPoint".($pts > 1 ? 's':'').' awarded = '.$pts.' out of '.$wgt;
		    $messagetail = " for <a href=\"".
		                   $feedurl."?symb=$showsymb\">$env{'form.probTitle'}</a>";
		}
		$msgstatus = 
                    &Apache::lonmsg::user_normal_msg($uname,$udom,$subject,
						     $message.$messagetail,
                                                     undef,$feedurl,undef,
                                                     undef,undef,$showsymb,
                                                     $restitle);
		$request->print('<br />'.&mt('Sending message to [_1]:[_2]',$uname,$udom).': '.
				$msgstatus);
	    }
	    if ($env{'form.collaborator'.$ctr}) {
		my @collabstrs=&Apache::loncommon::get_env_multiple("form.collaborator$ctr");
		foreach my $collabstr (@collabstrs) {
		    my ($part,@collaborators) = split(/:/,$collabstr);
		    foreach my $collaborator (@collaborators) {
			my ($errorflag,$pts,$wgt) = 
			    &saveHandGrade($request,$symb,$collaborator,$udom,$ctr,
					   $env{'form.unamedom'.$ctr},$part);
			if ($errorflag eq 'not_allowed') {
			    $request->print("<span class=\"LC_error\">".&mt('Not allowed to modify grades for [_1]',"$collaborator:$udom")."</span>");
			    next;
			} elsif ($message ne '') {
			    my ($baseurl,$showsymb) = 
				&get_feedurl_and_symb($symb,$collaborator,
						      $udom);
			    if ($env{'form.withgrades'.$ctr}) {
				$messagetail = " for <a href=\"".
                                    $baseurl."?symb=$showsymb\">$env{'form.probTitle'}</a>";
			    }
			    $msgstatus = 
				&Apache::lonmsg::user_normal_msg($collaborator,$udom,$subject,$message.$messagetail,undef,$baseurl,undef,undef,undef,$showsymb,$restitle);
			}
		    }
		}
	    }
	    $ctr++;
	}
    }

    if ($env{'form.handgrade'} eq 'yes') {
	# Keywords sorted in alphabatical order
	my $loginuser = $env{'user.name'}.':'.$env{'user.domain'};
	my %keyhash = ();
	$env{'form.keywords'}           =~ s/,\s{0,}|\s+/ /g;
	$env{'form.keywords'}           =~ s/^\s+|\s+$//;
	my (@keywords) = sort(split(/\s+/,$env{'form.keywords'}));
	$env{'form.keywords'} = join(' ',@keywords);
	$keyhash{$symb.'_keywords'}     = $env{'form.keywords'};
	$keyhash{$symb.'_subject'}      = $env{'form.msgsub'};
	$keyhash{$loginuser.'_kwclr'}   = $env{'form.kwclr'};
	$keyhash{$loginuser.'_kwsize'}  = $env{'form.kwsize'};
	$keyhash{$loginuser.'_kwstyle'} = $env{'form.kwstyle'};

	# message center - Order of message gets changed. Blank line is eliminated.
	# New messages are saved in env for the next student.
	# All messages are saved in nohist_handgrade.db
	my ($ctr,$idx) = (1,1);
	while ($ctr <= $env{'form.savemsgN'}) {
	    if ($env{'form.savemsg'.$ctr} ne '') {
		$keyhash{$symb.'_savemsg'.$idx} = $env{'form.savemsg'.$ctr};
		$idx++;
	    }
	    $ctr++;
	}
	$ctr = 0;
	while ($ctr < $ngrade) {
	    if ($env{'form.newmsg'.$ctr} ne '') {
		$keyhash{$symb.'_savemsg'.$idx} = $env{'form.newmsg'.$ctr};
		$env{'form.savemsg'.$idx} = $env{'form.newmsg'.$ctr};
		$idx++;
	    }
	    $ctr++;
	}
	$env{'form.savemsgN'} = --$idx;
	$keyhash{$symb.'_savemsgN'} = $env{'form.savemsgN'};
	my $putresult = &Apache::lonnet::put
	    ('nohist_handgrade',\%keyhash,$cdom,$cnum);
    }
    # Called by Save & Refresh from Highlight Attribute Window
    my (undef,undef,$fullname) = &getclasslist($env{'form.section'},'1');
    if ($env{'form.refresh'} eq 'on') {
	my ($ctr,$total) = (0,0);
	while ($ctr < $ngrade) {
	    $total++ if  $env{'form.unamedom'.$ctr} ne '';
	    $ctr++;
	}
	$env{'form.NTSTU'}=$ngrade;
	$ctr = 0;
	while ($ctr < $total) {
	    my $processUser = $env{'form.unamedom'.$ctr};
	    ($env{'form.student'},$env{'form.userdom'}) = split(/:/,$processUser);
	    $env{'form.fullname'} = $$fullname{$processUser};
	    &submission($request,$ctr,$total-1);
	    $ctr++;
	}
	return '';
    }

# Go directly to grade student - from submission or link from chart page
    if ($button eq 'Grade Student') {
	(undef,undef,$env{'form.handgrade'},undef,undef) = &showResourceInfo($symb);
	my $processUser = $env{'form.unamedom'.$env{'form.studentNo'}};
	($env{'form.student'},$env{'form.userdom'}) = split(/:/,$processUser);
	$env{'form.fullname'} = $$fullname{$processUser};
	&submission($request,0,0);
	return '';
    }

    # Get the next/previous one or group of students
    my $firststu = $env{'form.unamedom0'};
    my $laststu = $env{'form.unamedom'.($ngrade-1)};
    my $ctr = 2;
    while ($laststu eq '') {
	$laststu  = $env{'form.unamedom'.($ngrade-$ctr)};
	$ctr++;
	$laststu = $firststu if ($ctr > $ngrade);
    }

    my (@parsedlist,@nextlist);
    my ($nextflg) = 0;
    foreach (sort 
	     {
		 if (lc($$fullname{$a}) ne lc($$fullname{$b})) {
		     return (lc($$fullname{$a}) cmp lc($$fullname{$b}));
		 }
		 return $a cmp $b;
	     } (keys(%$fullname))) {
	if ($nextflg == 1 && $button =~ /Next$/) {
	    push @parsedlist,$_;
	}
	$nextflg = 1 if ($_ eq $laststu);
	if ($button eq 'Previous') {
	    last if ($_ eq $firststu);
	    push @parsedlist,$_;
	}
    }
    $ctr = 0;
    @parsedlist = reverse @parsedlist if ($button eq 'Previous');
    my ($partlist) = &response_type($symb);
    foreach my $student (@parsedlist) {
	my $submitonly=$env{'form.submitonly'};
	my ($uname,$udom) = split(/:/,$student);
	
	if ($submitonly eq 'queued') {
	    my %queue_status = 
		&Apache::bridgetask::get_student_status($symb,$cdom,$cnum,
							$udom,$uname);
	    next if (!defined($queue_status{'gradingqueue'}));
	}

	if ($submitonly =~ /^(yes|graded|incorrect)$/) {
#	    my %record = &Apache::lonnet::restore($symb,$env{'request.course.id'},$udom,$uname);
	    my %status=&student_gradeStatus($symb,$udom,$uname,$partlist);
	    my $submitted = 0;
	    my $ungraded = 0;
	    my $incorrect = 0;
	    foreach (keys(%status)) {
		$submitted = 1 if ($status{$_} ne 'nothing');
		$ungraded = 1 if ($status{$_} =~ /^ungraded/);
		$incorrect = 1 if ($status{$_} =~ /^incorrect/);
		my ($foo,$partid,$foo1) = split(/\./,$_);
		if ($status{'resource.'.$partid.'.submitted_by'} ne '') {
		    $submitted = 0;
		}
	    }
	    next if (!$submitted && ($submitonly eq 'yes' ||
				     $submitonly eq 'incorrect' ||
				     $submitonly eq 'graded'));
	    next if (!$ungraded && ($submitonly eq 'graded'));
	    next if (!$incorrect && $submitonly eq 'incorrect');
	}
	push @nextlist,$student if ($ctr < $ntstu);
	last if ($ctr == $ntstu);
	$ctr++;
    }

    $ctr = 0;
    my $total = scalar(@nextlist)-1;

    foreach (sort @nextlist) {
	my ($uname,$udom,$submitter) = split(/:/);
	$env{'form.student'}  = $uname;
	$env{'form.userdom'}  = $udom;
	$env{'form.fullname'} = $$fullname{$_};
	&submission($request,$ctr,$total);
	$ctr++;
    }
    if ($total < 0) {
	my $the_end = '<h3><span class="LC_info">'.&mt('LON-CAPA User Message').'</span></h3><br />'."\n";
	$the_end.=&mt('<b>Message: </b> No more students for this section or class.').'<br /><br />'."\n";
	$the_end.=&mt('Click on the button below to return to the grading menu.').'<br /><br />'."\n";
	$the_end.=&show_grading_menu_form($symb);
	$request->print($the_end);
    }
    return '';
}

#---- Save the score and award for each student, if changed
sub saveHandGrade {
    my ($request,$symb,$stuname,$domain,$newflg,$submitter,$part) = @_;
    my @version_parts;
    my $usec = &Apache::lonnet::getsection($domain,$stuname,
					   $env{'request.course.id'});
    if (!&canmodify($usec)) { return('not_allowed'); }
    my %record = &Apache::lonnet::restore($symb,$env{'request.course.id'},$domain,$stuname);
    my @parts_graded;
    my %newrecord  = ();
    my ($pts,$wgt) = ('','');
    my %aggregate = ();
    my $aggregateflag = 0;
    my @parts = split(/:/,$env{'form.partlist'.$newflg});
    foreach my $new_part (@parts) {
	#collaborator ($submi may vary for different parts
	if ($submitter && $new_part ne $part) { next; }
	my $dropMenu = $env{'form.GD_SEL'.$newflg.'_'.$new_part};
	if ($dropMenu eq 'excused') {
	    if ($record{'resource.'.$new_part.'.solved'} ne 'excused') {
		$newrecord{'resource.'.$new_part.'.solved'} = 'excused';
		if (exists($record{'resource.'.$new_part.'.awarded'})) {
		    $newrecord{'resource.'.$new_part.'.awarded'} = '';
		}
	        $newrecord{'resource.'.$new_part.'.regrader'}="$env{'user.name'}:$env{'user.domain'}";
	    }
	} elsif ($dropMenu eq 'reset status'
		 && exists($record{'resource.'.$new_part.'.solved'})) { #don't bother if no old records -> no attempts
	    foreach my $key (keys (%record)) {
		if ($key=~/^resource\.\Q$new_part\E\./) { $newrecord{$key} = ''; }
	    }
	    $newrecord{'resource.'.$new_part.'.regrader'}=
		"$env{'user.name'}:$env{'user.domain'}";
            my $totaltries = $record{'resource.'.$part.'.tries'};

            my %last_resets = &get_last_resets($symb,$env{'request.course.id'},
					       [$new_part]);
            my $aggtries =$totaltries;
            if ($last_resets{$new_part}) {
                $aggtries = &get_num_tries(\%record,$last_resets{$new_part},
					   $new_part);
            }

            my $solvedstatus = $record{'resource.'.$new_part.'.solved'};
            if ($aggtries > 0) {
                &decrement_aggs($symb,$new_part,\%aggregate,$aggtries,$totaltries,$solvedstatus);
                $aggregateflag = 1;
            }
	} elsif ($dropMenu eq '') {
	    $pts = ($env{'form.GD_BOX'.$newflg.'_'.$new_part} ne '' ? 
		    $env{'form.GD_BOX'.$newflg.'_'.$new_part} : 
		    $env{'form.RADVAL'.$newflg.'_'.$new_part});
	    if ($pts eq '' && $env{'form.GD_SEL'.$newflg.'_'.$new_part} eq '') {
		next;
	    }
	    $wgt = $env{'form.WGT'.$newflg.'_'.$new_part} eq '' ? 1 : 
		$env{'form.WGT'.$newflg.'_'.$new_part};
	    my $partial= $pts/$wgt;
	    if ($partial eq $record{'resource.'.$new_part.'.awarded'}) {
		#do not update score for part if not changed.
                &handback_files($request,$symb,$stuname,$domain,$newflg,$new_part,\%newrecord);
		next;
	    } else {
	        push @parts_graded, $new_part;
	    }
	    if ($record{'resource.'.$new_part.'.awarded'} ne $partial) {
		$newrecord{'resource.'.$new_part.'.awarded'}  = $partial;
	    }
	    my $reckey = 'resource.'.$new_part.'.solved';
	    if ($partial == 0) {
		if ($record{$reckey} ne 'incorrect_by_override') {
		    $newrecord{$reckey} = 'incorrect_by_override';
		}
	    } else {
		if ($record{$reckey} ne 'correct_by_override') {
		    $newrecord{$reckey} = 'correct_by_override';
		}
	    }	    
	    if ($submitter && 
		($record{'resource.'.$new_part.'.submitted_by'} ne $submitter)) {
		$newrecord{'resource.'.$new_part.'.submitted_by'} = $submitter;
	    }
	    $newrecord{'resource.'.$new_part.'.regrader'}=
		"$env{'user.name'}:$env{'user.domain'}";
	}
	# unless problem has been graded, set flag to version the submitted files
	unless ($record{'resource.'.$new_part.'.solved'} =~ /^correct_/  || 
	        $record{'resource.'.$new_part.'.solved'} eq 'incorrect_by_override' ||
	        $dropMenu eq 'reset status')
	   {
	    push (@version_parts,$new_part);
	}
    }
    my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};

    if (%newrecord) {
        if (@version_parts) {
            my @changed_keys = &version_portfiles(\%record, \@parts_graded, 
                                $env{'request.course.id'}, $symb, $domain, $stuname, \@version_parts);
	    @newrecord{@changed_keys} = @record{@changed_keys};
	    foreach my $new_part (@version_parts) {
		&handback_files($request,$symb,$stuname,$domain,$newflg,
				$new_part,\%newrecord);
	    }
        }
	&Apache::lonnet::cstore(\%newrecord,$symb,
				$env{'request.course.id'},$domain,$stuname);
	&check_and_remove_from_queue(\@parts,\%record,\%newrecord,$symb,
				     $cdom,$cnum,$domain,$stuname);
    }
    if ($aggregateflag) {
        &Apache::lonnet::cinc('nohist_resourcetracker',\%aggregate,
			      $cdom,$cnum);
    }
    return ('',$pts,$wgt);
}

sub check_and_remove_from_queue {
    my ($parts,$record,$newrecord,$symb,$cdom,$cnum,$domain,$stuname) = @_;
    my @ungraded_parts;
    foreach my $part (@{$parts}) {
	if (    $record->{   'resource.'.$part.'.awarded'} eq ''
	     && $record->{   'resource.'.$part.'.solved' } ne 'excused'
	     && $newrecord->{'resource.'.$part.'.awarded'} eq ''
	     && $newrecord->{'resource.'.$part.'.solved' } ne 'excused'
		) {
	    push(@ungraded_parts, $part);
	}
    }
    if ( !@ungraded_parts ) {
	&Apache::bridgetask::remove_from_queue('gradingqueue',$symb,$cdom,
					       $cnum,$domain,$stuname);
    }
}

sub handback_files {
    my ($request,$symb,$stuname,$domain,$newflg,$new_part,$newrecord) = @_;
    my $portfolio_root = '/userfiles/portfolio';
    my ($partlist,$handgrade,$responseType) = &response_type($symb);

    my @part_response_id = &flatten_responseType($responseType);
    foreach my $part_response_id (@part_response_id) {
    	my ($part_id,$resp_id) = @{ $part_response_id };
	my $part_resp = join('_',@{ $part_response_id });
            if (($env{'form.'.$newflg.'_'.$part_resp.'_returndoc1'}) && ($new_part == $part_id)) {
                # if multiple files are uploaded names will be 'returndoc2','returndoc3'
                my $file_counter = 1;
		my $file_msg;
                while ($env{'form.'.$newflg.'_'.$part_resp.'_returndoc'.$file_counter}) {
                    my $fname=$env{'form.'.$newflg.'_'.$part_resp.'_returndoc'.$file_counter.'.filename'};
                    my ($directory,$answer_file) = 
                        ($env{'form.'.$newflg.'_'.$part_resp.'_origdoc'.$file_counter} =~ /^(.*?)([^\/]*)$/);
                    my ($answer_name,$answer_ver,$answer_ext) =
		        &file_name_version_ext($answer_file);
		    my ($portfolio_path) = ($directory =~ /^.+$stuname\/portfolio(.*)/);
                    my $getpropath = 1;
		    my @dir_list = &Apache::lonnet::dirlist($portfolio_root.$portfolio_path,$domain,$stuname,$getpropath);
		    my $version = &get_next_version($answer_name, $answer_ext, \@dir_list);
                    # fix file name
                    my ($save_file_name) = (($directory.$answer_name.".$version.".$answer_ext) =~ /^.+\/${stuname}\/(.*)/);
                    my $result=&Apache::lonnet::finishuserfileupload($stuname,$domain,
            	                                $newflg.'_'.$part_resp.'_returndoc'.$file_counter,
            	                                $save_file_name);
                    if ($result !~ m|^/uploaded/|) {
                        $request->print('<span class="LC_error">An error occurred ('.$result.
                        ') while trying to upload '.$newflg.'_'.$part_resp.'_returndoc'.$file_counter.'</span><br />');
                    } else {
                        # mark the file as read only
                        my @files = ($save_file_name);
                        my @what = ($symb,$env{'request.course.id'},'handback');
                        &Apache::lonnet::mark_as_readonly($domain,$stuname,\@files,\@what);
			if (exists($$newrecord{"resource.$new_part.$resp_id.handback"})) {
			    $$newrecord{"resource.$new_part.$resp_id.handback"}.=',';
			}
                        $$newrecord{"resource.$new_part.$resp_id.handback"} .= $save_file_name;
			$file_msg.= "\n".'<br /><span class="LC_filename"><a href="/uploaded/'."$domain/$stuname/".$save_file_name.'">'.$save_file_name."</a></span><br />";

                    }
                    $request->print("<br />".$fname." will be the uploaded file name");
                    $request->print(" ".$env{'form.'.$newflg.'_'.$part_resp.'_origdoc'.$file_counter});
                    $file_counter++;
                }
		my $subject = "File Handed Back by Instructor ";
		my $message = "A file has been returned that was originally submitted in reponse to: <br />";
		$message .= "<strong>".&Apache::lonnet::gettitle($symb)."</strong><br />";
		$message .= ' The returned file(s) are named: '. $file_msg;
		$message .= " and can be found in your portfolio space.";
		my ($feedurl,$showsymb) = 
		    &get_feedurl_and_symb($symb,$domain,$stuname);
                my $restitle = &Apache::lonnet::gettitle($symb);
		my $msgstatus = 
                   &Apache::lonmsg::user_normal_msg($stuname,$domain,$subject.
			 ' (File Returned) ['.$restitle.']',$message,undef,
                         $feedurl,undef,undef,undef,$showsymb,$restitle);
            }
        }
    return;
}

sub get_feedurl_and_symb {
    my ($symb,$uname,$udom) = @_;
    my (undef,undef,$url) = &Apache::lonnet::decode_symb($symb);
    $url = &Apache::lonnet::clutter($url);
    my $encrypturl=&Apache::lonnet::EXT('resource.0.encrypturl',
					$symb,$udom,$uname);
    if ($encrypturl =~ /^yes$/i) {
	&Apache::lonenc::encrypted(\$url,1);
	&Apache::lonenc::encrypted(\$symb,1);
    }
    return ($url,$symb);
}

sub get_submitted_files {
    my ($udom,$uname,$partid,$respid,$record) = @_;
    my @files;
    if ($$record{"resource.$partid.$respid.portfiles"}) {
        my $file_url = '/uploaded/'.$udom.'/'.$uname.'/portfolio';
        foreach my $file (split(',',$$record{"resource.$partid.$respid.portfiles"})) {
    	    push(@files,$file_url.$file);
        }
    }
    if ($$record{"resource.$partid.$respid.uploadedurl"}) {
        push(@files,$$record{"resource.$partid.$respid.uploadedurl"});
    }
    return (\@files);
}

# ----------- Provides number of tries since last reset.
sub get_num_tries {
    my ($record,$last_reset,$part) = @_;
    my $timestamp = '';
    my $num_tries = 0;
    if ($$record{'version'}) {
        for (my $version=$$record{'version'};$version>=1;$version--) {
            if (exists($$record{$version.':resource.'.$part.'.solved'})) {
                $timestamp = $$record{$version.':timestamp'};
                if ($timestamp > $last_reset) {
                    $num_tries ++;
                } else {
                    last;
                }
            }
        }
    }
    return $num_tries;
}

# ----------- Determine decrements required in aggregate totals 
sub decrement_aggs {
    my ($symb,$part,$aggregate,$aggtries,$totaltries,$solvedstatus) = @_;
    my %decrement = (
                        attempts => 0,
                        users => 0,
                        correct => 0
                    );
    $decrement{'attempts'} = $aggtries;
    if ($solvedstatus =~ /^correct/) {
        $decrement{'correct'} = 1;
    }
    if ($aggtries == $totaltries) {
        $decrement{'users'} = 1;
    }
    foreach my $type (keys (%decrement)) {
        $$aggregate{$symb."\0".$part."\0".$type} = -$decrement{$type};
    }
    return;
}

# ----------- Determine timestamps for last reset of aggregate totals for parts  
sub get_last_resets {
    my ($symb,$courseid,$partids) =@_;
    my %last_resets;
    my $cdom = $env{'course.'.$courseid.'.domain'};
    my $cname = $env{'course.'.$courseid.'.num'};
    my @keys;
    foreach my $part (@{$partids}) {
	push(@keys,"$symb\0$part\0resettime");
    }
    my %results=&Apache::lonnet::get('nohist_resourcetracker',\@keys,
				     $cdom,$cname);
    foreach my $part (@{$partids}) {
	$last_resets{$part}=$results{"$symb\0$part\0resettime"};
    }
    return %last_resets;
}

# ----------- Handles creating versions for portfolio files as answers
sub version_portfiles {
    my ($record, $parts_graded, $courseid, $symb, $domain, $stu_name, $v_flag) = @_;
    my $version_parts = join('|',@$v_flag);
    my @returned_keys;
    my $parts = join('|', @$parts_graded);
    my $portfolio_root = '/userfiles/portfolio';
    foreach my $key (keys(%$record)) {
        my $new_portfiles;
        if ($key =~ /^resource\.($version_parts)\./ && $key =~ /\.portfiles$/ ) {
            my @versioned_portfiles;
            my @portfiles = split(/\s*,\s*/,$$record{$key});
            foreach my $file (@portfiles) {
                &Apache::lonnet::unmark_as_readonly($domain,$stu_name,[$symb,$env{'request.course.id'}],$file);
                my ($directory,$answer_file) =($file =~ /^(.*?)([^\/]*)$/);
		my ($answer_name,$answer_ver,$answer_ext) =
		    &file_name_version_ext($answer_file);
                my $getpropath = 1;    
                my @dir_list = &Apache::lonnet::dirlist($portfolio_root.$directory,$domain,$stu_name,$getpropath);
                my $version = &get_next_version($answer_name, $answer_ext, \@dir_list);
                my $new_answer = &version_selected_portfile($domain, $stu_name, $directory, $answer_file, $version);
                if ($new_answer ne 'problem getting file') {
                    push(@versioned_portfiles, $directory.$new_answer);
                    &Apache::lonnet::mark_as_readonly($domain,$stu_name,
                        [$directory.$new_answer],
                        [$symb,$env{'request.course.id'},'graded']);
                }
            }
            $$record{$key} = join(',',@versioned_portfiles);
            push(@returned_keys,$key);
        }
    } 
    return (@returned_keys);   
}

sub get_next_version {
    my ($answer_name, $answer_ext, $dir_list) = @_;
    my $version;
    foreach my $row (@$dir_list) {
        my ($file) = split(/\&/,$row,2);
        my ($file_name,$file_version,$file_ext) =
	    &file_name_version_ext($file);
        if (($file_name eq $answer_name) && 
	    ($file_ext eq $answer_ext)) {
                # gets here if filename and extension match, regardless of version
                if ($file_version ne '') {
                # a versioned file is found  so save it for later
                if ($file_version > $version) {
		    $version = $file_version;
	        }
            }
        }
    } 
    $version ++;
    return($version);
}

sub version_selected_portfile {
    my ($domain,$stu_name,$directory,$file_name,$version) = @_;
    my ($answer_name,$answer_ver,$answer_ext) =
        &file_name_version_ext($file_name);
    my $new_answer;
    $env{'form.copy'} = &Apache::lonnet::getfile("/uploaded/$domain/$stu_name/portfolio$directory$file_name");
    if($env{'form.copy'} eq '-1') {
        $new_answer = 'problem getting file';
    } else {
        $new_answer = $answer_name.'.'.$version.'.'.$answer_ext;
        my $copy_result = &Apache::lonnet::finishuserfileupload(
                            $stu_name,$domain,'copy',
		        '/portfolio'.$directory.$new_answer);
    }    
    return ($new_answer);
}

sub file_name_version_ext {
    my ($file)=@_;
    my @file_parts = split(/\./, $file);
    my ($name,$version,$ext);
    if (@file_parts > 1) {
	$ext=pop(@file_parts);
	if (@file_parts > 1 && $file_parts[-1] =~ /^\d+$/) {
	    $version=pop(@file_parts);
	}
	$name=join('.',@file_parts);
    } else {
	$name=join('.',@file_parts);
    }
    return($name,$version,$ext);
}

#--------------------------------------------------------------------------------------
#
#-------------------------- Next few routines handles grading by section or whole class
#
#--- Javascript to handle grading by section or whole class
sub viewgrades_js {
    my ($request) = shift;

    $request->print(<<VIEWJAVASCRIPT);
<script type="text/javascript" language="javascript">
   function writePoint(partid,weight,point) {
	var radioButton = document.classgrade["RADVAL_"+partid];
	var textbox = document.classgrade["TEXTVAL_"+partid];
	if (point == "textval") {
	    point = document.classgrade["TEXTVAL_"+partid].value;
	    if (isNaN(point) || parseFloat(point) < 0) {
		alert("A number equal or greater than 0 is expected. Entered value = "+parseFloat(point));
		var resetbox = false;
		for (var i=0; i<radioButton.length; i++) {
		    if (radioButton[i].checked) {
			textbox.value = i;
			resetbox = true;
		    }
		}
		if (!resetbox) {
		    textbox.value = "";
		}
		return;
	    }
	    if (parseFloat(point) > parseFloat(weight)) {
		var resp = confirm("You entered a value ("+parseFloat(point)+
				   ") greater than the weight for the part. Accept?");
		if (resp == false) {
		    textbox.value = "";
		    return;
		}
	    }
	    for (var i=0; i<radioButton.length; i++) {
		radioButton[i].checked=false;
		if (parseFloat(point) == i) {
		    radioButton[i].checked=true;
		}
	    }

	} else {
	    textbox.value = parseFloat(point);
	}
	for (i=0;i<document.classgrade.total.value;i++) {
	    var user = document.classgrade["ctr"+i].value;
	    user = user.replace(new RegExp(':', 'g'),"_");
	    var scorename = document.classgrade["GD_"+user+"_"+partid+"_awarded"];
	    var saveval   = document.classgrade["GD_"+user+"_"+partid+"_solved_s"].value;
	    var selname   = document.classgrade["GD_"+user+"_"+partid+"_solved"];
	    if (saveval != "correct") {
		scorename.value = point;
		if (selname[0].selected != true) {
		    selname[0].selected = true;
		}
	    }
	}
	document.classgrade["SELVAL_"+partid][0].selected = true;
    }

    function writeRadText(partid,weight) {
	var selval   = document.classgrade["SELVAL_"+partid];
	var radioButton = document.classgrade["RADVAL_"+partid];
        var override = document.classgrade["FORCE_"+partid].checked;
	var textbox = document.classgrade["TEXTVAL_"+partid];
	if (selval[1].selected || selval[2].selected) {
	    for (var i=0; i<radioButton.length; i++) {
		radioButton[i].checked=false;

	    }
	    textbox.value = "";

	    for (i=0;i<document.classgrade.total.value;i++) {
		var user = document.classgrade["ctr"+i].value;
		user = user.replace(new RegExp(':', 'g'),"_");
		var scorename = document.classgrade["GD_"+user+"_"+partid+"_awarded"];
		var saveval   = document.classgrade["GD_"+user+"_"+partid+"_solved_s"].value;
		var selname   = document.classgrade["GD_"+user+"_"+partid+"_solved"];
		if ((saveval != "correct") || override) {
		    scorename.value = "";
		    if (selval[1].selected) {
			selname[1].selected = true;
		    } else {
			selname[2].selected = true;
			if (Number(document.classgrade["GD_"+user+"_"+partid+"_tries"].value)) 
			{document.classgrade["GD_"+user+"_"+partid+"_tries"].value = '0';}
		    }
		}
	    }
	} else {
	    for (i=0;i<document.classgrade.total.value;i++) {
		var user = document.classgrade["ctr"+i].value;
		user = user.replace(new RegExp(':', 'g'),"_");
		var scorename = document.classgrade["GD_"+user+"_"+partid+"_awarded"];
		var saveval   = document.classgrade["GD_"+user+"_"+partid+"_solved_s"].value;
		var selname   = document.classgrade["GD_"+user+"_"+partid+"_solved"];
		if ((saveval != "correct") || override) {
		    scorename.value = document.classgrade["GD_"+user+"_"+partid+"_awarded_s"].value;
		    selname[0].selected = true;
		}
	    }
	}	    
    }

    function changeSelect(partid,user) {
	var selval = document.classgrade["GD_"+user+'_'+partid+"_solved"];
	var textbox = document.classgrade["GD_"+user+'_'+partid+"_awarded"];
	var point  = textbox.value;
	var weight = document.classgrade["weight_"+partid].value;

	if (isNaN(point) || parseFloat(point) < 0) {
	    alert("A number equal or greater than 0 is expected. Entered value = "+parseFloat(point));
	    textbox.value = "";
	    return;
	}
	if (parseFloat(point) > parseFloat(weight)) {
	    var resp = confirm("You entered a value ("+parseFloat(point)+
			       ") greater than the weight of the part. Accept?");
	    if (resp == false) {
		textbox.value = "";
		return;
	    }
	}
	selval[0].selected = true;
    }

    function changeOneScore(partid,user) {
	var selval = document.classgrade["GD_"+user+'_'+partid+"_solved"];
	if (selval[1].selected || selval[2].selected) {
	    document.classgrade["GD_"+user+'_'+partid+"_awarded"].value = "";
	    if (selval[2].selected) {
		document.classgrade["GD_"+user+'_'+partid+"_tries"].value = "0";
	    }
        }
    }

    function resetEntry(numpart) {
	for (ctpart=0;ctpart<numpart;ctpart++) {
	    var partid = document.classgrade["partid_"+ctpart].value;
	    var radioButton = document.classgrade["RADVAL_"+partid];
	    var textbox = document.classgrade["TEXTVAL_"+partid];
	    var selval  = document.classgrade["SELVAL_"+partid];
	    for (var i=0; i<radioButton.length; i++) {
		radioButton[i].checked=false;

	    }
	    textbox.value = "";
	    selval[0].selected = true;

	    for (i=0;i<document.classgrade.total.value;i++) {
		var user = document.classgrade["ctr"+i].value;
		user = user.replace(new RegExp(':', 'g'),"_");
		var resetscore = document.classgrade["GD_"+user+"_"+partid+"_awarded"];
		resetscore.value = document.classgrade["GD_"+user+"_"+partid+"_awarded_s"].value;
		var resettries = document.classgrade["GD_"+user+"_"+partid+"_tries"];
		resettries.value = document.classgrade["GD_"+user+"_"+partid+"_tries_s"].value;
		var saveselval   = document.classgrade["GD_"+user+"_"+partid+"_solved_s"].value;
		var selname   = document.classgrade["GD_"+user+"_"+partid+"_solved"];
		if (saveselval == "excused") {
		    if (selname[1].selected == false) { selname[1].selected = true;}
		} else {
		    if (selname[0].selected == false) {selname[0].selected = true};
		}
	    }
	}
    }

</script>
VIEWJAVASCRIPT
}

#--- show scores for a section or whole class w/ option to change/update a score
sub viewgrades {
    my ($request) = shift;
    &viewgrades_js($request);

    my ($symb) = &get_symb($request);
    #need to make sure we have the correct data for later EXT calls, 
    #thus invalidate the cache
    &Apache::lonnet::devalidatecourseresdata(
                 $env{'course.'.$env{'request.course.id'}.'.num'},
                 $env{'course.'.$env{'request.course.id'}.'.domain'});
    &Apache::lonnet::clear_EXT_cache_status();

    my $result='<h3><span class="LC_info">'.&mt('Manual Grading').'</span></h3>';
    $result.='<h4>'.&mt('<b>Current Resource: </b>[_1]',$env{'form.probTitle'}).'</h4>'."\n";

    #view individual student submission form - called using Javascript viewOneStudent
    $result.=&jscriptNform($symb);

    #beginning of class grading form
    my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
    $result.= '<form action="/adm/grades" method="post" name="classgrade">'."\n".
	'<input type="hidden" name="symb"    value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="command" value="editgrades" />'."\n".
	&build_section_inputs().
	'<input type="hidden" name="saveState" value="'.$env{'form.saveState'}.'" />'."\n".
	'<input type="hidden" name="Status" value="'.$env{'stu_status'}.'" />'."\n".
	'<input type="hidden" name="probTitle" value="'.$env{'form.probTitle'}.'" />'."\n";

    my $sectionClass;
    my $section_display = join (", ",&Apache::loncommon::get_env_multiple('form.section'));
    if ($env{'form.section'} eq 'all') {
	$sectionClass='Class';
    } elsif ($env{'form.section'} eq 'none') {
	$sectionClass='Students in no Section';
    } else {
	$sectionClass='Students in Section(s) [_1]';
    }
    $result.=
	'<h3>'.
	&mt("Assign Common Grade To $sectionClass",$section_display).'</h3>';
    $result.= &Apache::loncommon::start_data_table();
    #radio buttons/text box for assigning points for a section or class.
    #handles different parts of a problem
    my ($partlist,$handgrade,$responseType) = &response_type($symb);
    my %weight = ();
    my $ctsparts = 0;
    my %seen = ();
    my @part_response_id = &flatten_responseType($responseType);
    foreach my $part_response_id (@part_response_id) {
    	my ($partid,$respid) = @{ $part_response_id };
	my $part_resp = join('_',@{ $part_response_id });
	next if $seen{$partid};
	$seen{$partid}++;
	my $handgrade=$$handgrade{$part_resp};
	my $wgt = &Apache::lonnet::EXT('resource.'.$partid.'.weight',$symb);
	$weight{$partid} = $wgt eq '' ? '1' : $wgt;

	my $display_part=&get_display_part($partid,$symb);
	my $radio.='<table border="0"><tr>';  
	my $ctr = 0;
	while ($ctr<=$weight{$partid}) { # display radio buttons in a nice table 10 across
	    $radio.= '<td><label><input type="radio" name="RADVAL_'.$partid.'" '.
		'onclick="javascript:writePoint(\''.$partid.'\','.$weight{$partid}.
		','.$ctr.')" />'.$ctr."</label></td>\n";
	    $result.=(($ctr+1)%10 == 0 ? '</tr><tr>' : '');
	    $ctr++;
	}
	$radio.='</tr></table>';
	my $line = '<input type="text" name="TEXTVAL_'.
	    $partid.'" size="4" '.'onChange="javascript:writePoint(\''.
		$partid.'\','.$weight{$partid}.',\'textval\')" /> /'.
	    $weight{$partid}.' (problem weight)</td>'."\n";
	$line.= '<td><select name="SELVAL_'.$partid.'"'.
	    'onChange="javascript:writeRadText(\''.$partid.'\','.
		$weight{$partid}.')"> '.
	    '<option selected="selected"> </option>'.
	    '<option value="excused">'.&mt('excused').'</option>'.
	    '<option value="reset status">'.&mt('reset status').'</option>'.
	    '</select></td>'.
            '<td><label><input type="checkbox" name="FORCE_'.$partid.'" />'.&mt('Override "Correct"').'</label>';
	$line.='<input type="hidden" name="partid_'.
	    $ctsparts.'" value="'.$partid.'" />'."\n";
	$line.='<input type="hidden" name="weight_'.
	    $partid.'" value="'.$weight{$partid}.'" />'."\n";

	$result.=
	    &Apache::loncommon::start_data_table_row()."\n".
	    &mt('<td><b>Part:</b></td><td>[_1]</td><td><b>Points:</b></td><td>[_2]</td><td>or</td><td>[_3]</td>',$display_part,$radio,$line).
	    &Apache::loncommon::end_data_table_row()."\n";
	$ctsparts++;
    }
    $result.=&Apache::loncommon::end_data_table()."\n".
	'<input type="hidden" name="totalparts" value="'.$ctsparts.'" />';
    $result.='<input type="button" value="'.&mt('Revert to Default').'" '.
	'onClick="javascript:resetEntry('.$ctsparts.');" />';

    #table listing all the students in a section/class
    #header of table
    $result.= '<h3>'.&mt('Assign Grade to Specific Students in '.$sectionClass,
			 $section_display).'</h3>';
    $result.= &Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th>'.&mt('No.').'</th>'.
	'<th>'.&nameUserString('header')."</th>\n";
    my (@parts) = sort(&getpartlist($symb));
    my (undef,undef,$url)=&Apache::lonnet::decode_symb($symb);
    my @partids = ();
    foreach my $part (@parts) {
	my $display=&Apache::lonnet::metadata($url,$part.'.display');
	$display =~ s|^Number of Attempts|Tries<br />|; # makes the column narrower
	if  (!$display) { $display = &Apache::lonnet::metadata($url,$part.'.name'); }
	my ($partid) = &split_part_type($part);
        push(@partids, $partid);
	my $display_part=&get_display_part($partid,$symb);
	if ($display =~ /^Partial Credit Factor/) {
	    $result.='<th>'.
		&mt('Score Part: [_1]<br /> (weight = [_2])',
		    $display_part,$weight{$partid}).'</th>'."\n";
	    next;
	    
	} else {
	    if ($display =~ /Problem Status/) {
		my $grade_status_mt = &mt('Grade Status');
		$display =~ s{Problem Status}{$grade_status_mt<br />};
	    }
	    my $part_mt = &mt('Part:');
	    $display =~s{\[Part: \Q$partid\E\]}{$part_mt $display_part};
	}

	$result.='<th>'.$display.'</th>'."\n";
    }
    $result.=&Apache::loncommon::end_data_table_header_row();

    my %last_resets = 
	&get_last_resets($symb,$env{'request.course.id'},\@partids);

    #get info for each student
    #list all the students - with points and grade status
    my (undef,undef,$fullname) = &getclasslist($env{'form.section'},'1');
    my $ctr = 0;
    foreach (sort 
	     {
		 if (lc($$fullname{$a}) ne lc($$fullname{$b})) {
		     return (lc($$fullname{$a}) cmp lc($$fullname{$b}));
		 }
		 return $a cmp $b;
	     } (keys(%$fullname))) {
	$ctr++;
	$result.=&viewstudentgrade($symb,$env{'request.course.id'},
				   $_,$$fullname{$_},\@parts,\%weight,$ctr,\%last_resets);
    }
    $result.=&Apache::loncommon::end_data_table();
    $result.='<input type="hidden" name="total" value="'.$ctr.'" />'."\n";
    $result.='<input type="button" value="'.&mt('Save').'" '.
	'onClick="javascript:submit();" target="_self" /></form>'."\n";
    if (scalar(%$fullname) eq 0) {
	my $colspan=3+scalar(@parts);
	my $section_display = join (", ",&Apache::loncommon::get_env_multiple('form.section'));
        my $stu_status = join(' or ',&Apache::loncommon::get_env_multiple('form.Status'));
	$result='<span class="LC_warning">'.
	    &mt('There are no students in section(s) [_1] with enrollment status [_2] to modify or grade.',
	        $section_display, $stu_status).
	    '</span>';
    }
    $result.=&show_grading_menu_form($symb);
    return $result;
}

#--- call by previous routine to display each student
sub viewstudentgrade {
    my ($symb,$courseid,$student,$fullname,$parts,$weight,$ctr,$last_resets) = @_;
    my ($uname,$udom) = split(/:/,$student);
    my %record=&Apache::lonnet::restore($symb,$courseid,$udom,$uname);
    my %aggregates = (); 
    my $result=&Apache::loncommon::start_data_table_row().'<td align="right">'.
	'<input type="hidden" name="ctr'.($ctr-1).'" value="'.$student.'" />'.
	"\n".$ctr.'&nbsp;</td><td>&nbsp;'.
	'<a href="javascript:viewOneStudent(\''.$uname.'\',\''.$udom.
	'\');" target="_self">'.$fullname.'</a> '.
	'<span class="LC_internal_info">('.$uname.($env{'user.domain'} eq $udom ? '' : ':'.$udom).')</span></td>'."\n";
    $student=~s/:/_/; # colon doen't work in javascript for names
    foreach my $apart (@$parts) {
	my ($part,$type) = &split_part_type($apart);
	my $score=$record{"resource.$part.$type"};
        $result.='<td align="center">';
        my ($aggtries,$totaltries);
        unless (exists($aggregates{$part})) {
	    $totaltries = $record{'resource.'.$part.'.tries'};

	    $aggtries = $totaltries;
            if ($$last_resets{$part}) {  
                $aggtries = &get_num_tries(\%record,$$last_resets{$part},
					   $part);
            }
            $result.='<input type="hidden" name="'.
                'GD_'.$student.'_'.$part.'_aggtries" value="'.$aggtries.'" />'."\n";
            $result.='<input type="hidden" name="'.
                'GD_'.$student.'_'.$part.'_totaltries" value="'.$totaltries.'" />'."\n";
            $aggregates{$part} = 1;
        }
	if ($type eq 'awarded') {
	    my $pts = $score eq '' ? '' : &compute_points($score,$$weight{$part});
	    $result.='<input type="hidden" name="'.
		'GD_'.$student.'_'.$part.'_awarded_s" value="'.$pts.'" />'."\n";
	    $result.='<input type="text" name="'.
		'GD_'.$student.'_'.$part.'_awarded" '.
		'onChange="javascript:changeSelect(\''.$part.'\',\''.$student.
		'\')" value="'.$pts.'" size="4" /></td>'."\n";
	} elsif ($type eq 'solved') {
	    my ($status,$foo)=split(/_/,$score,2);
	    $status = 'nothing' if ($status eq '');
	    $result.='<input type="hidden" name="'.'GD_'.$student.'_'.
		$part.'_solved_s" value="'.$status.'" />'."\n";
	    $result.='&nbsp;<select name="'.
		'GD_'.$student.'_'.$part.'_solved" '.
		'onChange="javascript:changeOneScore(\''.$part.'\',\''.$student.'\')" >'."\n";
	    $result.= (($status eq 'excused') ? '<option> </option><option selected="selected" value="excused">'.&mt('excused').'</option>' 
		: '<option selected="selected"> </option><option value="excused">'.&mt('excused').'</option>')."\n";
	    $result.='<option value="reset status">'.&mt('reset status').'</option>';
	    $result.="</select>&nbsp;</td>\n";
	} else {
	    $result.='<input type="hidden" name="'.
		'GD_'.$student.'_'.$part.'_'.$type.'_s" value="'.$score.'" />'.
		    "\n";
	    $result.='<input type="text" name="'.
		'GD_'.$student.'_'.$part.'_'.$type.'" '.
		'value="'.$score.'" size="4" /></td>'."\n";
	}
    }
    $result.=&Apache::loncommon::end_data_table_row();
    return $result;
}

#--- change scores for all the students in a section/class
#    record does not get update if unchanged
sub editgrades {
    my ($request) = @_;

    my $symb=&get_symb($request);
    my $section_display = join (", ",&Apache::loncommon::get_env_multiple('form.section'));
    my $title='<h2>'.&mt('Current Grade Status').'</h2>';
    $title.='<h4>'.&mt('<b>Current Resource: </b>[_1]',$env{'form.probTitle'}).'</h4>'."\n";
    $title.='<h4>'.&mt('<b>Section: </b>[_1]',$section_display).'</h4>'."\n";

    my $result= &Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th rowspan="2" valign="middle">'.&mt('No.').'</th>'.
	'<th rowspan="2" valign="middle">'.&nameUserString('header')."</th>\n";
    my %scoreptr = (
		    'correct'  =>'correct_by_override',
		    'incorrect'=>'incorrect_by_override',
		    'excused'  =>'excused',
		    'ungraded' =>'ungraded_attempted',
		    'nothing'  => '',
		    );
    my ($classlist,undef,$fullname) = &getclasslist($env{'form.section'},'0');

    my (@partid);
    my %weight = ();
    my %columns = ();
    my ($i,$ctr,$count,$rec_update) = (0,0,0,0);

    my (@parts) = sort(&getpartlist($symb));
    my $header;
    while ($ctr < $env{'form.totalparts'}) {
	my $partid = $env{'form.partid_'.$ctr};
	push @partid,$partid;
	$weight{$partid} = $env{'form.weight_'.$partid};
	$ctr++;
    }
    my (undef,undef,$url) = &Apache::lonnet::decode_symb($symb);
    foreach my $partid (@partid) {
	$header .= '<th align="center">'.&mt('Old Score').'</th>'.
	    '<th align="center">'.&mt('New Score').'</th>';
	$columns{$partid}=2;
	foreach my $stores (@parts) {
	    my ($part,$type) = &split_part_type($stores);
	    if ($part !~ m/^\Q$partid\E/) { next;}
	    if ($type eq 'awarded' || $type eq 'solved') { next; }
	    my $display=&Apache::lonnet::metadata($url,$stores.'.display');
	    $display =~ s/\[Part: (\w)+\]//;
	    $display =~ s/Number of Attempts/Tries/;
	    $header .= '<th align="center">'.&mt('Old '.$display).'</th>'.
		'<th align="center">'.&mt('New '.$display).'</th>';
	    $columns{$partid}+=2;
	}
    }
    foreach my $partid (@partid) {
	my $display_part=&get_display_part($partid,$symb);
	$result .= '<th colspan="'.$columns{$partid}.'" align="center">'.
	    &mt('Part: [_1] (Weight = [_2])',$display_part,$weight{$partid}).
	    '</th>';

    }
    $result .= &Apache::loncommon::end_data_table_header_row().
	&Apache::loncommon::start_data_table_header_row().
	$header.
	&Apache::loncommon::end_data_table_header_row();
    my @noupdate;
    my ($updateCtr,$noupdateCtr) = (1,1);
    for ($i=0; $i<$env{'form.total'}; $i++) {
	my $line;
	my $user = $env{'form.ctr'.$i};
	my ($uname,$udom)=split(/:/,$user);
	my %newrecord;
	my $updateflag = 0;
	$line .= '<td>'.&nameUserString(undef,$$fullname{$user},$uname,$udom).'</td>';
	my $usec=$classlist->{"$uname:$udom"}[5];
	if (!&canmodify($usec)) {
	    my $numcols=scalar(@partid)*4+2;
	    push(@noupdate,
		 $line."<td colspan=\"$numcols\"><span class=\"LC_warning\">".
		 &mt('Not allowed to modify student')."</span></td></tr>");
	    next;
	}
        my %aggregate = ();
        my $aggregateflag = 0;
	$user=~s/:/_/; # colon doen't work in javascript for names
	foreach (@partid) {
	    my $old_aw    = $env{'form.GD_'.$user.'_'.$_.'_awarded_s'};
	    my $old_part_pcr = $old_aw/($weight{$_} ne '0' ? $weight{$_}:1);
	    my $old_part  = $old_aw eq '' ? '' : $old_part_pcr;
	    my $old_score = $scoreptr{$env{'form.GD_'.$user.'_'.$_.'_solved_s'}};
	    my $awarded   = $env{'form.GD_'.$user.'_'.$_.'_awarded'};
	    my $pcr       = $awarded/($weight{$_} ne '0' ? $weight{$_} : 1);
	    my $partial   = $awarded eq '' ? '' : $pcr;
	    my $score;
	    if ($partial eq '') {
		$score = $scoreptr{$env{'form.GD_'.$user.'_'.$_.'_solved_s'}};
	    } elsif ($partial > 0) {
		$score = 'correct_by_override';
	    } elsif ($partial == 0) {
		$score = 'incorrect_by_override';
	    }
	    my $dropMenu = $env{'form.GD_'.$user.'_'.$_.'_solved'};
	    $score = 'excused' if (($dropMenu eq 'excused') && ($score ne 'excused'));

	    $newrecord{'resource.'.$_.'.regrader'}=
		"$env{'user.name'}:$env{'user.domain'}";
	    if ($dropMenu eq 'reset status' &&
		$old_score ne '') { # ignore if no previous attempts => nothing to reset
		$newrecord{'resource.'.$_.'.tries'} = '';
		$newrecord{'resource.'.$_.'.solved'} = '';
		$newrecord{'resource.'.$_.'.award'} = '';
		$newrecord{'resource.'.$_.'.awarded'} = '';
		$updateflag = 1;
                if ($env{'form.GD_'.$user.'_'.$_.'_aggtries'} > 0) {
                    my $aggtries = $env{'form.GD_'.$user.'_'.$_.'_aggtries'};
                    my $totaltries = $env{'form.GD_'.$user.'_'.$_.'_totaltries'};
                    my $solvedstatus = $env{'form.GD_'.$user.'_'.$_.'_solved_s'};
                    &decrement_aggs($symb,$_,\%aggregate,$aggtries,$totaltries,$solvedstatus);
                    $aggregateflag = 1;
                }
	    } elsif (!($old_part eq $partial && $old_score eq $score)) {
		$updateflag = 1;
		$newrecord{'resource.'.$_.'.awarded'}  = $partial if $partial ne '';
		$newrecord{'resource.'.$_.'.solved'}   = $score;
		$rec_update++;
	    }

	    $line .= '<td align="center">'.$old_aw.'&nbsp;</td>'.
		'<td align="center">'.$awarded.
		($score eq 'excused' ? $score : '').'&nbsp;</td>';


	    my $partid=$_;
	    foreach my $stores (@parts) {
		my ($part,$type) = &split_part_type($stores);
		if ($part !~ m/^\Q$partid\E/) { next;}
		if ($type eq 'awarded' || $type eq 'solved') { next; }
		my $old_aw    = $env{'form.GD_'.$user.'_'.$part.'_'.$type.'_s'};
		my $awarded   = $env{'form.GD_'.$user.'_'.$part.'_'.$type};
		if ($awarded ne '' && $awarded ne $old_aw) {
		    $newrecord{'resource.'.$part.'.'.$type}= $awarded;
		    $newrecord{'resource.'.$part.'.regrader'}="$env{'user.name'}:$env{'user.domain'}";
		    $updateflag=1;
		}
		$line .= '<td align="center">'.$old_aw.'&nbsp;</td>'.
		    '<td align="center">'.$awarded.'&nbsp;</td>';
	    }
	}
	$line.="\n";

	my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
	my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};

	if ($updateflag) {
	    $count++;
	    &Apache::lonnet::cstore(\%newrecord,$symb,$env{'request.course.id'},
				    $udom,$uname);

	    if (&Apache::bridgetask::in_queue('gradingqueue',$symb,$cdom,
					      $cnum,$udom,$uname)) {
		# need to figure out if should be in queue.
		my %record =  
		    &Apache::lonnet::restore($symb,$env{'request.course.id'},
					     $udom,$uname);
		my $all_graded = 1;
		my $none_graded = 1;
		foreach my $part (@parts) {
		    if ( $record{'resource.'.$part.'.awarded'} eq '' ) {
			$all_graded = 0;
		    } else {
			$none_graded = 0;
		    }
		}

		if ($all_graded || $none_graded) {
		    &Apache::bridgetask::remove_from_queue('gradingqueue',
							   $symb,$cdom,$cnum,
							   $udom,$uname);
		}
	    }

	    $result.=&Apache::loncommon::start_data_table_row().
		'<td align="right">&nbsp;'.$updateCtr.'&nbsp;</td>'.$line.
		&Apache::loncommon::end_data_table_row();
	    $updateCtr++;
	} else {
	    push(@noupdate,
		 '<td align="right">&nbsp;'.$noupdateCtr.'&nbsp;</td>'.$line);
	    $noupdateCtr++;
	}
        if ($aggregateflag) {
            &Apache::lonnet::cinc('nohist_resourcetracker',\%aggregate,
				  $cdom,$cnum);
        }
    }
    if (@noupdate) {
#	my $numcols=(scalar(@partid)*(scalar(@parts)-1)*2)+3;
	my $numcols=scalar(@partid)*4+2;
	$result .= &Apache::loncommon::start_data_table_row('LC_empty_row').
	    '<td align="center" colspan="'.$numcols.'">'.
	    &mt('No Changes Occurred For the Students Below').
	    '</td>'.
	    &Apache::loncommon::end_data_table_row();
	foreach my $line (@noupdate) {
	    $result.=
		&Apache::loncommon::start_data_table_row().
		$line.
		&Apache::loncommon::end_data_table_row();
	}
    }
    $result .= &Apache::loncommon::end_data_table().
	&show_grading_menu_form($symb);
    my $msg = '<p><b>'.
	&mt('Number of records updated = [_1] for [quant,_2,student].',
	    $rec_update,$count).'</b><br />'.
	'<b>'.&mt('Total number of students = [_1]',$env{'form.total'}).
	'</b></p>';
    return $title.$msg.$result;
}

sub split_part_type {
    my ($partstr) = @_;
    my ($temp,@allparts)=split(/_/,$partstr);
    my $type=pop(@allparts);
    my $part=join('_',@allparts);
    return ($part,$type);
}

#------------- end of section for handling grading by section/class ---------
#
#----------------------------------------------------------------------------


#----------------------------------------------------------------------------
#
#-------------------------- Next few routines handles grading by csv upload
#
#--- Javascript to handle csv upload
sub csvupload_javascript_reverse_associate {
    my $error1=&mt('You need to specify the username or ID');
    my $error2=&mt('You need to specify at least one grading field');
  return(<<ENDPICK);
  function verify(vf) {
    var foundsomething=0;
    var founduname=0;
    var foundID=0;
    for (i=0;i<=vf.nfields.value;i++) {
      tw=eval('vf.f'+i+'.selectedIndex');
      if (i==0 && tw!=0) { foundID=1; }
      if (i==1 && tw!=0) { founduname=1; }
      if (i!=0 && i!=1 && i!=2 && tw!=0) { foundsomething=1; }
    }
    if (founduname==0 && foundID==0) {
	alert('$error1');
	return;
    }
    if (foundsomething==0) {
	alert('$error2');
	return;
    }
    vf.submit();
  }
  function flip(vf,tf) {
    var nw=eval('vf.f'+tf+'.selectedIndex');
    var i;
    for (i=0;i<=vf.nfields.value;i++) {
      //can not pick the same destination field for both name and domain
      if (((i ==0)||(i ==1)) && 
          ((tf==0)||(tf==1)) && 
          (i!=tf) &&
          (eval('vf.f'+i+'.selectedIndex')==nw)) {
        eval('vf.f'+i+'.selectedIndex=0;')
      }
    }
  }
ENDPICK
}

sub csvupload_javascript_forward_associate {
    my $error1=&mt('You need to specify the username or ID');
    my $error2=&mt('You need to specify at least one grading field');
  return(<<ENDPICK);
  function verify(vf) {
    var foundsomething=0;
    var founduname=0;
    var foundID=0;
    for (i=0;i<=vf.nfields.value;i++) {
      tw=eval('vf.f'+i+'.selectedIndex');
      if (tw==1) { foundID=1; }
      if (tw==2) { founduname=1; }
      if (tw>3) { foundsomething=1; }
    }
    if (founduname==0 && foundID==0) {
	alert('$error1');
	return;
    }
    if (foundsomething==0) {
	alert('$error2');
	return;
    }
    vf.submit();
  }
  function flip(vf,tf) {
    var nw=eval('vf.f'+tf+'.selectedIndex');
    var i;
    //can not pick the same destination field twice
    for (i=0;i<=vf.nfields.value;i++) {
      if ((i!=tf) && (eval('vf.f'+i+'.selectedIndex')==nw)) {
        eval('vf.f'+i+'.selectedIndex=0;')
      }
    }
  }
ENDPICK
}

sub csvuploadmap_header {
    my ($request,$symb,$datatoken,$distotal)= @_;
    my $javascript;
    if ($env{'form.upfile_associate'} eq 'reverse') {
	$javascript=&csvupload_javascript_reverse_associate();
    } else {
	$javascript=&csvupload_javascript_forward_associate();
    }

    my ($result) = &showResourceInfo($symb,$env{'form.probTitle'});
    my $checked=(($env{'form.noFirstLine'})?' checked="checked"':'');
    my $ignore=&mt('Ignore First Line');
    $symb = &Apache::lonenc::check_encrypt($symb);
    $request->print(<<ENDPICK);
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<h3><span class="LC_info">Uploading Class Grades</span></h3>
$result
<hr />
<h3>Identify fields</h3>
Total number of records found in file: $distotal <hr />
Enter as many fields as you can. The system will inform you and bring you back
to this page if the data selected is insufficient to run your class.<hr />
<input type="button" value="Reverse Association" onClick="javascript:this.form.associate.value='Reverse Association';submit(this.form);" />
<label><input type="checkbox" name="noFirstLine" $checked />$ignore</label>
<input type="hidden" name="associate"  value="" />
<input type="hidden" name="phase"      value="three" />
<input type="hidden" name="datatoken"  value="$datatoken" />
<input type="hidden" name="fileupload" value="$env{'form.fileupload'}" />
<input type="hidden" name="upfiletype" value="$env{'form.upfiletype'}" />
<input type="hidden" name="upfile_associate" 
                                       value="$env{'form.upfile_associate'}" />
<input type="hidden" name="symb"       value="$symb" />
<input type="hidden" name="saveState"  value="$env{'form.saveState'}" />
<input type="hidden" name="probTitle"  value="$env{'form.probTitle'}" />
<input type="hidden" name="command"    value="csvuploadoptions" />
<hr />
<script type="text/javascript" language="Javascript">
$javascript
</script>
ENDPICK
    return '';

}

sub csvupload_fields {
    my ($symb) = @_;
    my (@parts) = &getpartlist($symb);
    my @fields=(['ID','Student ID'],
		['username','Student Username'],
		['domain','Student Domain']);
    my (undef,undef,$url) = &Apache::lonnet::decode_symb($symb);
    foreach my $part (sort(@parts)) {
	my @datum;
	my $display=&Apache::lonnet::metadata($url,$part.'.display');
	my $name=$part;
	if  (!$display) { $display = $name; }
	@datum=($name,$display);
	if ($name=~/^stores_(.*)_awarded/) {
	    push(@fields,['stores_'.$1.'_points',"Points [Part: $1]"]);
	}
	push(@fields,\@datum);
    }
    return (@fields);
}

sub csvuploadmap_footer {
    my ($request,$i,$keyfields) =@_;
    $request->print(<<ENDPICK);
</table>
<input type="hidden" name="nfields" value="$i" />
<input type="hidden" name="keyfields" value="$keyfields" />
<input type="button" onClick="javascript:verify(this.form)" value="Assign Grades" /><br />
</form>
ENDPICK
}

sub checkforfile_js {
    my $result =<<CSVFORMJS;
<script type="text/javascript" language="javascript">
    function checkUpload(formname) {
	if (formname.upfile.value == "") {
	    alert("Please use the browse button to select a file from your local directory.");
	    return false;
	}
	formname.submit();
    }
    </script>
CSVFORMJS
    return $result;
}

sub upcsvScores_form {
    my ($request) = shift;
    my ($symb)=&get_symb($request);
    if (!$symb) {return '';}
    my $result=&checkforfile_js();
    $env{'form.probTitle'} = &Apache::lonnet::gettitle($symb);
    my ($table) = &showResourceInfo($symb,$env{'form.probTitle'});
    $result.=$table;
    $result.='<br /><table width="100%" border="0"><tr><td bgcolor="#777777">'."\n";
    $result.='<table width="100%" border="0"><tr bgcolor="#e6ffff"><td>'."\n";
    $result.='&nbsp;<b>'.&mt('Specify a file containing the class scores for current resource').
	'.</b></td></tr>'."\n";
    $result.='<tr bgcolor=#ffffe6><td>'."\n";
    my $upload=&mt("Upload Scores");
    my $upfile_select=&Apache::loncommon::upfile_select_html();
    my $ignore=&mt('Ignore First Line');
    $symb = &Apache::lonenc::check_encrypt($symb);
    $result.=<<ENDUPFORM;
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<input type="hidden" name="symb" value="$symb" />
<input type="hidden" name="command" value="csvuploadmap" />
<input type="hidden" name="probTitle" value="$env{'form.probTitle'}" />
<input type="hidden" name="saveState"  value="$env{'form.saveState'}" />
$upfile_select
<br /><input type="button" onClick="javascript:checkUpload(this.form);" value="$upload" />
<label><input type="checkbox" name="noFirstLine" />$ignore</label>
</form>
ENDUPFORM
    $result.=&Apache::loncommon::help_open_topic("Course_Convert_To_CSV",
                           &mt("How do I create a CSV file from a spreadsheet"))
    .'</td></tr></table>'."\n";
    $result.='</td></tr></table><br /><br />'."\n";
    $result.=&show_grading_menu_form($symb);
    return $result;
}


sub csvuploadmap {
    my ($request)= @_;
    my ($symb)=&get_symb($request);
    if (!$symb) {return '';}

    my $datatoken;
    if (!$env{'form.datatoken'}) {
	$datatoken=&Apache::loncommon::upfile_store($request);
    } else {
	$datatoken=$env{'form.datatoken'};
	&Apache::loncommon::load_tmp_file($request);
    }
    my @records=&Apache::loncommon::upfile_record_sep();
    if ($env{'form.noFirstLine'}) { shift(@records); }
    &csvuploadmap_header($request,$symb,$datatoken,$#records+1);
    my ($i,$keyfields);
    if (@records) {
	my @fields=&csvupload_fields($symb);

	if ($env{'form.upfile_associate'} eq 'reverse') {	
	    &Apache::loncommon::csv_print_samples($request,\@records);
	    $i=&Apache::loncommon::csv_print_select_table($request,\@records,
							  \@fields);
	    foreach (@fields) { $keyfields.=$_->[0].','; }
	    chop($keyfields);
	} else {
	    unshift(@fields,['none','']);
	    $i=&Apache::loncommon::csv_samples_select_table($request,\@records,
							    \@fields);
            foreach my $rec (@records) {
                my %temp = &Apache::loncommon::record_sep($rec);
                if (%temp) {
                    $keyfields=join(',',sort(keys(%temp)));
                    last;
                }
            }
	}
    }
    &csvuploadmap_footer($request,$i,$keyfields);
    $request->print(&show_grading_menu_form($symb));

    return '';
}

sub csvuploadoptions {
    my ($request)= @_;
    my ($symb)=&get_symb($request);
    my $checked=(($env{'form.noFirstLine'})?'1':'0');
    my $ignore=&mt('Ignore First Line');
    $request->print(<<ENDPICK);
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<h3><span class="LC_info">Uploading Class Grade Options</span></h3>
<input type="hidden" name="command"    value="csvuploadassign" />
<!--
<p>
<label>
   <input type="checkbox" name="show_full_results" />
   Show a table of all changes
</label>
</p>
-->
<p>
<label>
   <input type="checkbox" name="overwite_scores" checked="checked" />
   Overwrite any existing score
</label>
</p>
ENDPICK
    my %fields=&get_fields();
    if (!defined($fields{'domain'})) {
	my $domform = &Apache::loncommon::select_dom_form($env{'request.role.domain'},'default_domain');
	$request->print("\n<p> Users are in domain: ".$domform."</p>\n");
    }
    foreach my $key (sort(keys(%env))) {
	if ($key !~ /^form\.(.*)$/) { next; }
	my $cleankey=$1;
	if ($cleankey eq 'command') { next; }
	$request->print('<input type="hidden" name="'.$cleankey.
			'"  value="'.$env{$key}.'" />'."\n");
    }
    # FIXME do a check for any duplicated user ids...
    # FIXME do a check for any invalid user ids?...
    $request->print('<input type="submit" value="Assign Grades" /><br />
<hr /></form>'."\n");
    $request->print(&show_grading_menu_form($symb));
    return '';
}

sub get_fields {
    my %fields;
    my @keyfields = split(/\,/,$env{'form.keyfields'});
    for (my $i=0; $i<=$env{'form.nfields'}; $i++) {
	if ($env{'form.upfile_associate'} eq 'reverse') {
	    if ($env{'form.f'.$i} ne 'none') {
		$fields{$keyfields[$i]}=$env{'form.f'.$i};
	    }
	} else {
	    if ($env{'form.f'.$i} ne 'none') {
		$fields{$env{'form.f'.$i}}=$keyfields[$i];
	    }
	}
    }
    return %fields;
}

sub csvuploadassign {
    my ($request)= @_;
    my ($symb)=&get_symb($request);
    if (!$symb) {return '';}
    my $error_msg = '';
    &Apache::loncommon::load_tmp_file($request);
    my @gradedata = &Apache::loncommon::upfile_record_sep();
    if ($env{'form.noFirstLine'}) { shift(@gradedata); }
    my %fields=&get_fields();
    $request->print('<h3>Assigning Grades</h3>');
    my $courseid=$env{'request.course.id'};
    my ($classlist) = &getclasslist('all',0);
    my @notallowed;
    my @skipped;
    my $countdone=0;
    foreach my $grade (@gradedata) {
	my %entries=&Apache::loncommon::record_sep($grade);
	my $domain;
	if ($entries{$fields{'domain'}}) {
	    $domain=$entries{$fields{'domain'}};
	} else {
	    $domain=$env{'form.default_domain'};
	}
	$domain=~s/\s//g;
	my $username=$entries{$fields{'username'}};
	$username=~s/\s//g;
	if (!$username) {
	    my $id=$entries{$fields{'ID'}};
	    $id=~s/\s//g;
	    my %ids=&Apache::lonnet::idget($domain,$id);
	    $username=$ids{$id};
	}
	if (!exists($$classlist{"$username:$domain"})) {
	    my $id=$entries{$fields{'ID'}};
	    $id=~s/\s//g;
	    if ($id) {
		push(@skipped,"$id:$domain");
	    } else {
		push(@skipped,"$username:$domain");
	    }
	    next;
	}
	my $usec=$classlist->{"$username:$domain"}[5];
	if (!&canmodify($usec)) {
	    push(@notallowed,"$username:$domain");
	    next;
	}
	my %points;
	my %grades;
	foreach my $dest (keys(%fields)) {
	    if ($dest eq 'ID' || $dest eq 'username' ||
		$dest eq 'domain') { next; }
	    if ($entries{$fields{$dest}} =~ /^\s*$/) { next; }
	    if ($dest=~/stores_(.*)_points/) {
		my $part=$1;
		my $wgt =&Apache::lonnet::EXT('resource.'.$part.'.weight',
					      $symb,$domain,$username);
                if ($wgt) {
                    $entries{$fields{$dest}}=~s/\s//g;
                    my $pcr=$entries{$fields{$dest}} / $wgt;
                    my $award=($pcr == 0) ? 'incorrect_by_override'
                                          : 'correct_by_override';
                    $grades{"resource.$part.awarded"}=$pcr;
                    $grades{"resource.$part.solved"}=$award;
                    $points{$part}=1;
                } else {
                    $error_msg = "<br />" .
                        &mt("Some point values were assigned"
                            ." for problems with a weight "
                            ."of zero. These values were "
                            ."ignored.");
                }
	    } else {
		if ($dest=~/stores_(.*)_awarded/) { if ($points{$1}) {next;} }
		if ($dest=~/stores_(.*)_solved/)  { if ($points{$1}) {next;} }
		my $store_key=$dest;
		$store_key=~s/^stores/resource/;
		$store_key=~s/_/\./g;
		$grades{$store_key}=$entries{$fields{$dest}};
	    }
	}
	if (! %grades) { 
           push(@skipped,&mt("[_1]: no data to save","$username:$domain")); 
        } else {
	   $grades{"resource.regrader"}="$env{'user.name'}:$env{'user.domain'}";
	   my $result=&Apache::lonnet::cstore(\%grades,$symb,
					   $env{'request.course.id'},
					   $domain,$username);
	   if ($result eq 'ok') {
	      $request->print('.');
	   } else {
	      $request->print("<p><span class=\"LC_error\">".
                              &mt("Failed to save data for student [_1]. Message when trying to save was: [_2]",
                                  "$username:$domain",$result)."</span></p>");
	   }
	   $request->rflush();
	   $countdone++;
        }
    }
    $request->print('<br /><span class="LC_info">'.&mt("Saved [_1] students",$countdone)."</span>\n");
    if (@skipped) {
	$request->print('<p><span class="LC_warning">'.&mt('Skipped Students').'</span></p>');
	foreach my $student (@skipped) { $request->print("$student<br />\n"); }
    }
    if (@notallowed) {
	$request->print('<p><span class="LC_error">'.&mt('Students Not Allowed to Modify').'</span></p>');
	foreach my $student (@notallowed) { $request->print("$student<br />\n"); }
    }
    $request->print("<br />\n");
    $request->print(&show_grading_menu_form($symb));
    return $error_msg;
}
#------------- end of section for handling csv file upload ---------
#
#-------------------------------------------------------------------
#
#-------------- Next few routines handle grading by page/sequence
#
#--- Select a page/sequence and a student to grade
sub pickStudentPage {
    my ($request) = shift;

    $request->print(<<LISTJAVASCRIPT);
<script type="text/javascript" language="javascript">

function checkPickOne(formname) {
    if (radioSelection(formname.student) == null) {
	alert("Please select the student you wish to grade.");
	return;
    }
    ptr = pullDownSelection(formname.selectpage);
    formname.page.value = formname["page"+ptr].value;
    formname.title.value = formname["title"+ptr].value;
    formname.submit();
}

</script>
LISTJAVASCRIPT
    &commonJSfunctions($request);
    my ($symb) = &get_symb($request);
    my $cdom      = $env{"course.$env{'request.course.id'}.domain"};
    my $cnum      = $env{"course.$env{'request.course.id'}.num"};
    my $getsec    = $env{'form.section'} eq '' ? 'all' : $env{'form.section'};

    my $result='<h3><span class="LC_info">&nbsp;'.
	&mt('Manual Grading by Page or Sequence').'</span></h3>';

    $result.='<form action="/adm/grades" method="post" name="displayPage">'."\n";
    my ($titles,$symbx) = &getSymbMap();
    my ($curpage) =&Apache::lonnet::decode_symb($symb); 
#    my ($curpage,$mapId) =&Apache::lonnet::decode_symb($symb); 
#    my $type=($curpage =~ /\.(page|sequence)/);
    my $select = '<select name="selectpage">'."\n";
    my $ctr=0;
    foreach (@$titles) {
	my ($minder,$showtitle) = ($_ =~ /(\d+)\.(.*)/);
	$select.='<option value="'.$ctr.'" '.
	    ($$symbx{$_} =~ /$curpage$/ ? 'selected="selected"' : '').
	    '>'.$showtitle.'</option>'."\n";
	$ctr++;
    }
    $select.= '</select>';
    $result.=&mt('&nbsp;<b>Problems from:</b> [_1]',$select)."<br />\n";

    $ctr=0;
    foreach (@$titles) {
	my ($minder,$showtitle) = ($_ =~ /(\d+)\.(.*)/);
	$result.='<input type="hidden" name="page'.$ctr.'" value="'.$$symbx{$_}.'" />'."\n";
	$result.='<input type="hidden" name="title'.$ctr.'" value="'.$showtitle.'" />'."\n";
	$ctr++;
    }
    $result.='<input type="hidden" name="page" />'."\n".
	'<input type="hidden" name="title" />'."\n";

    my $options =
	'<label><input type="radio" name="vProb" value="no" checked="checked" /> '.&mt('no').' </label>'."\n".
	'<label><input type="radio" name="vProb" value="yes" /> '.&mt('yes').' </label>'."<br />\n";
    $result.='&nbsp;'.&mt('<b>View Problems Text: </b> [_1]',$options);

    $options =
	'<label><input type="radio" name="lastSub" value="none" /> '.&mt('none').' </label>'."\n".
	'<label><input type="radio" name="lastSub" value="datesub" checked="checked" /> '.&mt('by dates and submissions').'</label>'."\n".
	'<label><input type="radio" name="lastSub" value="all" /> '.&mt('all details').' </label>'."\n";
    $result.='&nbsp;'.&mt('<b>Submission Details: </b>[_1]',$options);
    
    $result.=&build_section_inputs();
    my $stu_status = join(':',&Apache::loncommon::get_env_multiple('form.Status'));
    $result.='<input type="hidden" name="Status"  value="'.$stu_status.'" />'."\n".
	'<input type="hidden" name="command" value="displayPage" />'."\n".
	'<input type="hidden" name="symb"    value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="saveState" value="'.$env{'form.saveState'}.'" />'."<br />\n";

    $result.='&nbsp;'.&mt('<b>Use CODE: [_1] </b>',
			  '<input type="text" name="CODE" value="" />').
			      '<br />'."\n";

    $result.='&nbsp;<input type="button" '.
	'onClick="javascript:checkPickOne(this.form);" value="'.&mt('Next-&gt;').'" /><br />'."\n";

    $request->print($result);

    my $studentTable.='&nbsp;<b>'.&mt('Select a student you wish to grade and then click on the Next button.').'</b><br />'.
	&Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th align="right">&nbsp;'.&mt('No.').'</th>'.
	'<th>'.&nameUserString('header').'</th>'.
	'<th align="right">&nbsp;'.&mt('No.').'</th>'.
	'<th>'.&nameUserString('header').'</th>'.
	&Apache::loncommon::end_data_table_header_row();
 
    my (undef,undef,$fullname) = &getclasslist($getsec,'1');
    my $ptr = 1;
    foreach my $student (sort 
			 {
			     if (lc($$fullname{$a}) ne lc($$fullname{$b})) {
				 return (lc($$fullname{$a}) cmp lc($$fullname{$b}));
			     }
			     return $a cmp $b;
			 } (keys(%$fullname))) {
	my ($uname,$udom) = split(/:/,$student);
	$studentTable.=($ptr%2==1 ? &Apache::loncommon::start_data_table_row()
                                  : '</td>');
	$studentTable.='<td align="right">'.$ptr.'&nbsp;</td>';
	$studentTable.='<td>&nbsp;<label><input type="radio" name="student" value="'.$student.'" /> '
	    .&nameUserString(undef,$$fullname{$student},$uname,$udom)."</label>\n";
	$studentTable.=
	    ($ptr%2 == 0 ? '</td>'.&Apache::loncommon::end_data_table_row() 
                         : '');
	$ptr++;
    }
    if ($ptr%2 == 0) {
	$studentTable.='</td><td>&nbsp;</td><td>&nbsp;</td>'.
	    &Apache::loncommon::end_data_table_row();
    }
    $studentTable.=&Apache::loncommon::end_data_table()."\n";
    $studentTable.='<input type="button" '.
	'onClick="javascript:checkPickOne(this.form);" value="'.&mt('Next-&gt;').'" /></form>'."\n";

    $studentTable.=&show_grading_menu_form($symb);
    $request->print($studentTable);

    return '';
}

sub getSymbMap {
    my $navmap = Apache::lonnavmaps::navmap->new();

    my %symbx = ();
    my @titles = ();
    my $minder = 0;

    # Gather every sequence that has problems.
    my @sequences = $navmap->retrieveResources(undef, sub { shift->is_map(); },
					       1,0,1);
    for my $sequence ($navmap->getById('0.0'), @sequences) {
	if ($navmap->hasResource($sequence, sub { shift->is_problem(); }, 0) ) {
	    my $title = $minder.'.'.
		&HTML::Entities::encode($sequence->compTitle(),'"\'&');
	    push(@titles, $title); # minder in case two titles are identical
	    $symbx{$title} = &HTML::Entities::encode($sequence->symb(),'"\'&');
	    $minder++;
	}
    }
    return \@titles,\%symbx;
}

#
#--- Displays a page/sequence w/wo problems, w/wo submissions
sub displayPage {
    my ($request) = shift;

    my ($symb) = &get_symb($request);
    my $cdom      = $env{"course.$env{'request.course.id'}.domain"};
    my $cnum      = $env{"course.$env{'request.course.id'}.num"};
    my $getsec    = $env{'form.section'} eq '' ? 'all' : $env{'form.section'};
    my $pageTitle = $env{'form.page'};
    my ($classlist,undef,$fullname) = &getclasslist($getsec,'1');
    my ($uname,$udom) = split(/:/,$env{'form.student'});
    my $usec=$classlist->{$env{'form.student'}}[5];

    #need to make sure we have the correct data for later EXT calls, 
    #thus invalidate the cache
    &Apache::lonnet::devalidatecourseresdata(
                 $env{'course.'.$env{'request.course.id'}.'.num'},
                 $env{'course.'.$env{'request.course.id'}.'.domain'});
    &Apache::lonnet::clear_EXT_cache_status();

    if (!&canview($usec)) {
	$request->print('<span class="LC_warning">'.&mt('Unable to view requested student. ([_1])',$env{'form.student'}).'</span>');
	$request->print(&show_grading_menu_form($symb));
	return;
    }
    my $result='<h3><span class="LC_info">&nbsp;'.$env{'form.title'}.'</span></h3>';
    $result.='<h3>&nbsp;'.&mt('Student: [_1]',&nameUserString(undef,$$fullname{$env{'form.student'}},$uname,$udom)).
	'</h3>'."\n";
    $env{'form.CODE'} = uc($env{'form.CODE'});
    if (&Apache::lonnet::validCODE(uc($env{'form.CODE'}))) {
	$result.='<h3>&nbsp;'.&mt('CODE: [_1]',$env{'form.CODE'}).'</h3>'."\n";
    } else {
	delete($env{'form.CODE'});
    }
    &sub_page_js($request);
    $request->print($result);

    my $navmap = Apache::lonnavmaps::navmap->new();
    my ($mapUrl, $id, $resUrl)=&Apache::lonnet::decode_symb($env{'form.page'});
    my $map = $navmap->getResourceByUrl($resUrl); # add to navmaps
    if (!$map) {
	$request->print('<span class="LC_warning">'.&mt('Unable to view requested sequence. ([_1])',$resUrl).'</span>');
	$request->print(&show_grading_menu_form($symb));
	return; 
    }
    my $iterator = $navmap->getIterator($map->map_start(),
					$map->map_finish());

    my $studentTable='<form action="/adm/grades" method="post" name="gradePage">'."\n".
	'<input type="hidden" name="command" value="gradeByPage" />'."\n".
	'<input type="hidden" name="fullname" value="'.$$fullname{$env{'form.student'}}.'" />'."\n".
	'<input type="hidden" name="student" value="'.$env{'form.student'}.'" />'."\n".
	'<input type="hidden" name="page"    value="'.$pageTitle.'" />'."\n".
	'<input type="hidden" name="title"   value="'.$env{'form.title'}.'" />'."\n".
	'<input type="hidden" name="symb"    value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="overRideScore" value="no" />'."\n".
	'<input type="hidden" name="saveState" value="'.$env{'form.saveState'}.'" />'."\n";

    if (defined($env{'form.CODE'})) {
	$studentTable.=
	    '<input type="hidden" name="CODE" value="'.$env{'form.CODE'}.'" />'."\n";
    }
    my $checkIcon = '<img alt="'.&mt('Check Mark').
	'" src="'.&Apache::loncommon::lonhttpdurl($request->dir_config('lonIconsURL').'/check.gif').'" height="16" border="0" />';

    $studentTable.='&nbsp;'.&mt('<b>Note:</b> Problems graded correct by the computer are marked with a [_1] symbol.',$checkIcon)."\n".
	&Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th align="center">&nbsp;Prob.&nbsp;</th>'.
	'<th>&nbsp;'.($env{'form.vProb'} eq 'no' ? &mt('Title') : &mt('Problem Text')).'/'.&mt('Grade').'</th>'.
	&Apache::loncommon::end_data_table_header_row();

    &Apache::lonxml::clear_problem_counter();
    my ($depth,$question,$prob) = (1,1,1);
    $iterator->next(); # skip the first BEGIN_MAP
    my $curRes = $iterator->next(); # for "current resource"
    while ($depth > 0) {
        if($curRes == $iterator->BEGIN_MAP) { $depth++; }
        if($curRes == $iterator->END_MAP) { $depth--; }

        if (ref($curRes) && $curRes->is_problem()) {
	    my $parts = $curRes->parts();
            my $title = $curRes->compTitle();
	    my $symbx = $curRes->symb();
	    $studentTable.=
		&Apache::loncommon::start_data_table_row().
		'<td align="center" valign="top" >'.$prob.
		(scalar(@{$parts}) == 1 ? '' 
		                        : '<br />('.&mt('[_1]&nbsp;parts)',
							scalar(@{$parts}))
		 ).
		 '</td>';
	    $studentTable.='<td valign="top">';
	    my %form = ('CODE' => $env{'form.CODE'},);
	    if ($env{'form.vProb'} eq 'yes' ) {
		$studentTable.=&show_problem($request,$symbx,$uname,$udom,1,
					     undef,'both',\%form);
	    } else {
		my $companswer = &Apache::loncommon::get_student_answers($symbx,$uname,$udom,$env{'request.course.id'},%form);
		$companswer =~ s|<form(.*?)>||g;
		$companswer =~ s|</form>||g;
#		while ($companswer =~ /(<a href\=\"javascript:newWindow.*?Script Vars<\/a>)/s) { #<a href="javascript:newWindow</a>
#		    $companswer =~ s/$1/ /ms;
#		    $request->print('match='.$1."<br />\n");
#		}
#		$companswer =~ s|<table border=\"1\">|<table border=\"0\">|g;
		$studentTable.='&nbsp;<b>'.$title.'</b>&nbsp;<br />&nbsp;'.&mt('<b>Correct answer:</b><br />[_1]',$companswer);
	    }

	    my %record = &Apache::lonnet::restore($symbx,$env{'request.course.id'},$udom,$uname);

	    if ($env{'form.lastSub'} eq 'datesub') {
		if ($record{'version'} eq '') {
		    $studentTable.='<br />&nbsp;<span class="LC_warning">'.&mt('No recorded submission for this problem.').'</span><br />';
		} else {
		    my %responseType = ();
		    foreach my $partid (@{$parts}) {
			my @responseIds =$curRes->responseIds($partid);
			my @responseType =$curRes->responseType($partid);
			my %responseIds;
			for (my $i=0;$i<=$#responseIds;$i++) {
			    $responseIds{$responseIds[$i]}=$responseType[$i];
			}
			$responseType{$partid} = \%responseIds;
		    }
		    $studentTable.= &displaySubByDates($symbx,\%record,$parts,\%responseType,$checkIcon,$uname,$udom);

		}
	    } elsif ($env{'form.lastSub'} eq 'all') {
		my $last = ($env{'form.lastSub'} eq 'last' ? 'last' : '');
		$studentTable.=&Apache::loncommon::get_previous_attempt($symbx,$uname,$udom,
									$env{'request.course.id'},
									'','.submission');
 
	    }
	    if (&canmodify($usec)) {
		foreach my $partid (@{$parts}) {
		    $studentTable.=&gradeBox($request,$symbx,$uname,$udom,$question,$partid,\%record);
		    $studentTable.='<input type="hidden" name="q_'.$question.'" value="'.$partid.'" />'."\n";
		    $question++;
		}
		$prob++;
	    }
	    $studentTable.='</td></tr>';

	}
        $curRes = $iterator->next();
    }

    $studentTable.='</table>'."\n".
	'<input type="button" value="'.&mt('Save').'" '.
	'onClick="javascript:checkSubmitPage(this.form,'.$question.');" />'.
	'</form>'."\n";
    $studentTable.=&show_grading_menu_form($symb);
    $request->print($studentTable);

    return '';
}

sub displaySubByDates {
    my ($symb,$record,$parts,$responseType,$checkIcon,$uname,$udom) = @_;
    my $isCODE=0;
    my $isTask = ($symb =~/\.task$/);
    if (exists($record->{'resource.CODE'})) { $isCODE=1; }
    my $studentTable=&Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th>'.&mt('Date/Time').'</th>'.
	($isCODE?'<th>'.&mt('CODE').'</th>':'').
	'<th>'.&mt('Submission').'</th>'.
	'<th>'.&mt('Status').'</th>'.
	&Apache::loncommon::end_data_table_header_row();
    my ($version);
    my %mark;
    my %orders;
    $mark{'correct_by_student'} = $checkIcon;
    if (!exists($$record{'1:timestamp'})) {
	return '<br />&nbsp;<span class="LC_warning">'.&mt('Nothing submitted - no attempts').'</span><br />';
    }

    my $interaction;
    for ($version=1;$version<=$$record{'version'};$version++) {
	my $timestamp = 
	    &Apache::lonlocal::locallocaltime($$record{$version.':timestamp'});
	if (exists($$record{$version.':resource.0.version'})) {
	    $interaction = $$record{$version.':resource.0.version'};
	}

	my $where = ($isTask ? "$version:resource.$interaction"
		             : "$version:resource");
	$studentTable.=&Apache::loncommon::start_data_table_row().
	    '<td>'.$timestamp.'</td>';
	if ($isCODE) {
	    $studentTable.='<td>'.$record->{$version.':resource.CODE'}.'</td>';
	}
	my @versionKeys = split(/\:/,$$record{$version.':keys'});
	my @displaySub = ();
	foreach my $partid (@{$parts}) {
	    my @matchKey = ($isTask ? sort(grep /^resource\.\d+\.\Q$partid\E\.award$/,@versionKeys)
			            : sort(grep /^resource\.\Q$partid\E\..*?\.submission$/,@versionKeys));
	    

#	    next if ($$record{"$version:resource.$partid.solved"} eq '');
	    my $display_part=&get_display_part($partid,$symb);
	    foreach my $matchKey (@matchKey) {
		if (exists($$record{$version.':'.$matchKey}) &&
		    $$record{$version.':'.$matchKey} ne '') {

		    my ($responseId)= ($isTask ? ($matchKey=~ /^resource\.(.*?)\.\Q$partid\E\.award$/)
				               : ($matchKey=~ /^resource\.\Q$partid\E\.(.*?)\.submission$/));
		    $displaySub[0].='<b>'.&mt('Part:').'</b>&nbsp;'.$display_part.'&nbsp;';
		    $displaySub[0].='<span class="LC_internal_info">('.&mt('ID').'&nbsp;'.
			$responseId.')</span>&nbsp;<b>';
		    if ($$record{"$where.$partid.tries"} eq '') {
			$displaySub[0].=&mt('Trial&nbsp;not&nbsp;counted');
		    } else {
			$displaySub[0].=&mt('Trial&nbsp;[_1]',
					    $$record{"$where.$partid.tries"});
		    }
		    my $responseType=($isTask ? 'Task'
                                              : $responseType->{$partid}->{$responseId});
		    if (!exists($orders{$partid})) { $orders{$partid}={}; }
		    if (!exists($orders{$partid}->{$responseId})) {
			$orders{$partid}->{$responseId}=
			    &get_order($partid,$responseId,$symb,$uname,$udom);
		    }
		    $displaySub[0].='</b>&nbsp; '.
			&cleanRecord($$record{$version.':'.$matchKey},$responseType,$symb,$partid,$responseId,$record,$orders{$partid}->{$responseId},"$version:",$uname,$udom).'<br />';
		}
	    }
	    if (exists($$record{"$where.$partid.checkedin"})) {
		$displaySub[1].=&mt('Checked in by [_1] into slot [_2]',
				    $$record{"$where.$partid.checkedin"},
				    $$record{"$where.$partid.checkedin.slot"}).
					'<br />';
	    }
	    if (exists $$record{"$where.$partid.award"}) {
		$displaySub[1].='<b>'.&mt('Part:').'</b>&nbsp;'.$display_part.' &nbsp;'.
		    lc($$record{"$where.$partid.award"}).' '.
		    $mark{$$record{"$where.$partid.solved"}}.
		    '<br />';
	    }
	    if (exists $$record{"$where.$partid.regrader"}) {
		$displaySub[2].=$$record{"$where.$partid.regrader"}.
		    ' (<b>'.&mt('Part').':</b> '.$display_part.')';
	    } elsif ($$record{"$version:resource.$partid.regrader"} =~ /\S/) {
		$displaySub[2].=
		    $$record{"$version:resource.$partid.regrader"}.
		    ' (<b>'.&mt('Part').':</b> '.$display_part.')';
	    }
	}
	# needed because old essay regrader has not parts info
	if (exists $$record{"$version:resource.regrader"}) {
	    $displaySub[2].=$$record{"$version:resource.regrader"};
	}
	$studentTable.='<td>'.$displaySub[0].'&nbsp;</td><td>'.$displaySub[1];
	if ($displaySub[2]) {
	    $studentTable.=&mt('Manually graded by [_1]',$displaySub[2]);
	}
	$studentTable.='&nbsp;</td>'.
	    &Apache::loncommon::end_data_table_row();
    }
    $studentTable.=&Apache::loncommon::end_data_table();
    return $studentTable;
}

sub updateGradeByPage {
    my ($request) = shift;

    my $cdom      = $env{"course.$env{'request.course.id'}.domain"};
    my $cnum      = $env{"course.$env{'request.course.id'}.num"};
    my $getsec    = $env{'form.section'} eq '' ? 'all' : $env{'form.section'};
    my $pageTitle = $env{'form.page'};
    my ($classlist,undef,$fullname) = &getclasslist($getsec,'1');
    my ($uname,$udom) = split(/:/,$env{'form.student'});
    my $usec=$classlist->{$env{'form.student'}}[5];
    if (!&canmodify($usec)) {
	$request->print('<span class="LC_warning">Unable to modify requested student.('.$env{'form.student'}.'</span>');
	$request->print(&show_grading_menu_form($env{'form.symb'}));
	return;
    }
    my $result='<h3><span class="LC_info">&nbsp;'.$env{'form.title'}.'</span></h3>';
    $result.='<h3>&nbsp;Student: '.&nameUserString(undef,$env{'form.fullname'},$uname,$udom).
	'</h3>'."\n";

    $request->print($result);

    my $navmap = Apache::lonnavmaps::navmap->new();
    my ($mapUrl, $id, $resUrl) = &Apache::lonnet::decode_symb( $env{'form.page'});
    my $map = $navmap->getResourceByUrl($resUrl); # add to navmaps
    if (!$map) {
	$request->print('<span class="LC_warning">Unable to grade requested sequence. ('.$resUrl.')</span>');
	my ($symb)=&get_symb($request);
	$request->print(&show_grading_menu_form($symb));
	return; 
    }
    my $iterator = $navmap->getIterator($map->map_start(),
					$map->map_finish());

    my $studentTable=
	&Apache::loncommon::start_data_table().
	&Apache::loncommon::start_data_table_header_row().
	'<th align="center">&nbsp;'.&mt('Prob.').'&nbsp;</th>'.
	'<th>&nbsp;'.&mt('Title').'&nbsp;</th>'.
	'<th>&nbsp;'.&mt('Previous Score').'&nbsp;</th>'.
	'<th>&nbsp;'.&mt('New Score').'&nbsp;</th>'.
	&Apache::loncommon::end_data_table_header_row();

    $iterator->next(); # skip the first BEGIN_MAP
    my $curRes = $iterator->next(); # for "current resource"
    my ($depth,$question,$prob,$changeflag)= (1,1,1,0);
    while ($depth > 0) {
        if($curRes == $iterator->BEGIN_MAP) { $depth++; }
        if($curRes == $iterator->END_MAP) { $depth--; }

        if (ref($curRes) && $curRes->is_problem()) {
	    my $parts = $curRes->parts();
            my $title = $curRes->compTitle();
	    my $symbx = $curRes->symb();
	    $studentTable.=
		&Apache::loncommon::start_data_table_row().
		'<td align="center" valign="top" >'.$prob.
		(scalar(@{$parts}) == 1 ? '' 
                                        : '<br />('.&mt('[quant,_1,&nbsp;parts]',scalar(@{$parts}))
		 ).')</td>';
	    $studentTable.='<td valign="top">&nbsp;<b>'.$title.'</b>&nbsp;</td>';

	    my %newrecord=();
	    my @displayPts=();
            my %aggregate = ();
            my $aggregateflag = 0;
	    foreach my $partid (@{$parts}) {
		my $newpts = $env{'form.GD_BOX'.$question.'_'.$partid};
		my $oldpts = $env{'form.oldpts'.$question.'_'.$partid};

		my $wgt = $env{'form.WGT'.$question.'_'.$partid} != 0 ? 
		    $env{'form.WGT'.$question.'_'.$partid} : 1;
		my $partial = $newpts/$wgt;
		my $score;
		if ($partial > 0) {
		    $score = 'correct_by_override';
		} elsif ($newpts ne '') { #empty is taken as 0
		    $score = 'incorrect_by_override';
		}
		my $dropMenu = $env{'form.GD_SEL'.$question.'_'.$partid};
		if ($dropMenu eq 'excused') {
		    $partial = '';
		    $score = 'excused';
		} elsif ($dropMenu eq 'reset status'
			 && $env{'form.solved'.$question.'_'.$partid} ne '') { #update only if previous record exists
		    $newrecord{'resource.'.$partid.'.tries'} = 0;
		    $newrecord{'resource.'.$partid.'.solved'} = '';
		    $newrecord{'resource.'.$partid.'.award'} = '';
		    $newrecord{'resource.'.$partid.'.awarded'} = 0;
		    $newrecord{'resource.'.$partid.'.regrader'} = "$env{'user.name'}:$env{'user.domain'}";
		    $changeflag++;
		    $newpts = '';
                    
                    my $aggtries =  $env{'form.aggtries'.$question.'_'.$partid};
                    my $totaltries = $env{'form.totaltries'.$question.'_'.$partid};
                    my $solvedstatus = $env{'form.solved'.$question.'_'.$partid};
                    if ($aggtries > 0) {
                        &decrement_aggs($symbx,$partid,\%aggregate,$aggtries,$totaltries,$solvedstatus);
                        $aggregateflag = 1;
                    }
		}
		my $display_part=&get_display_part($partid,$curRes->symb());
		my $oldstatus = $env{'form.solved'.$question.'_'.$partid};
		$displayPts[0].='&nbsp;<b>Part:</b> '.$display_part.' = '.
		    (($oldstatus eq 'excused') ? 'excused' : $oldpts).
		    '&nbsp;<br />';
		$displayPts[1].='&nbsp;<b>Part:</b> '.$display_part.' = '.
		     (($score eq 'excused') ? 'excused' : $newpts).
		    '&nbsp;<br />';
		$question++;
		next if ($dropMenu eq 'reset status' || ($newpts eq $oldpts && $score ne 'excused'));

		$newrecord{'resource.'.$partid.'.awarded'}  = $partial if $partial ne '';
		$newrecord{'resource.'.$partid.'.solved'}   = $score if $score ne '';
		$newrecord{'resource.'.$partid.'.regrader'} = "$env{'user.name'}:$env{'user.domain'}"
		    if (scalar(keys(%newrecord)) > 0);

		$changeflag++;
	    }
	    if (scalar(keys(%newrecord)) > 0) {
		my %record = 
		    &Apache::lonnet::restore($symbx,$env{'request.course.id'},
					     $udom,$uname);

		if (&Apache::lonnet::validCODE($env{'form.CODE'})) {
		    $newrecord{'resource.CODE'} = $env{'form.CODE'};
		} elsif (&Apache::lonnet::validCODE($record{'resource.CODE'})) {
		    $newrecord{'resource.CODE'} = '';
		}
		&Apache::lonnet::cstore(\%newrecord,$symbx,$env{'request.course.id'},
					$udom,$uname);
		%record = &Apache::lonnet::restore($symbx,
						   $env{'request.course.id'},
						   $udom,$uname);
		&check_and_remove_from_queue($parts,\%record,undef,$symbx,
					     $cdom,$cnum,$udom,$uname);
	    }
	    
            if ($aggregateflag) {
                &Apache::lonnet::cinc('nohist_resourcetracker',\%aggregate,
                      $env{'course.'.$env{'request.course.id'}.'.domain'},
                      $env{'course.'.$env{'request.course.id'}.'.num'});
            }

	    $studentTable.='<td valign="top">'.$displayPts[0].'</td>'.
		'<td valign="top">'.$displayPts[1].'</td>'.
		&Apache::loncommon::end_data_table_row();

	    $prob++;
	}
        $curRes = $iterator->next();
    }

    $studentTable.=&Apache::loncommon::end_data_table();
    $studentTable.=&show_grading_menu_form($env{'form.symb'});
    my $grademsg=($changeflag == 0 ? 'No score was changed or updated.' :
		  'The scores were changed for '.
		  $changeflag.' problem'.($changeflag == 1 ? '.' : 's.'));
    $request->print($grademsg.$studentTable);

    return '';
}

#-------- end of section for handling grading by page/sequence ---------
#
#-------------------------------------------------------------------

#--------------------Scantron Grading-----------------------------------
#
#------ start of section for handling grading by page/sequence ---------

=pod

=head1 Bubble sheet grading routines

  For this documentation:

   'scanline' refers to the full line of characters
   from the file that we are parsing that represents one entire sheet

   'bubble line' refers to the data
   representing the line of bubbles that are on the physical bubble sheet


The overall process is that a scanned in bubble sheet data is uploaded
into a course. When a user wants to grade, they select a
sequence/folder of resources, a file of bubble sheet info, and pick
one of the predefined configurations for what each scanline looks
like.

Next each scanline is checked for any errors of either 'missing
bubbles' (it's an error because it may have been mis-scanned
because too light bubbling), 'double bubble' (each bubble line should
have no more that one letter picked), invalid or duplicated CODE,
invalid student ID

If the CODE option is used that determines the randomization of the
homework problems, either way the student ID is looked up into a
username:domain.

During the validation phase the instructor can choose to skip scanlines. 

After the validation phase, there are now 3 bubble sheet files

  scantron_original_filename (unmodified original file)
  scantron_corrected_filename (file where the corrected information has replaced the original information)
  scantron_skipped_filename (contains the exact text of scanlines that where skipped)

Also there is a separate hash nohist_scantrondata that contains extra
correction information that isn't representable in the bubble sheet
file (see &scantron_getfile() for more information)

After all scanlines are either valid, marked as valid or skipped, then
foreach line foreach problem in the picked sequence, an ssi request is
made that simulates a user submitting their selected letter(s) against
the homework problem.

=over 4



=item defaultFormData

  Returns html hidden inputs used to hold context/default values.

 Arguments:
  $symb - $symb of the current resource 

=cut

sub defaultFormData {
    my ($symb)=@_;
    return '<input type="hidden" name="symb"    value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
     '<input type="hidden" name="saveState" value="'.$env{'form.saveState'}.'" />'."\n".
     '<input type="hidden" name="probTitle" value="'.$env{'form.probTitle'}.'" />'."\n";
}


=pod 

=item getSequenceDropDown

   Return html dropdown of possible sequences to grade
 
 Arguments:
   $symb - $symb of the current resource 

=cut

sub getSequenceDropDown {
    my ($symb)=@_;
    my $result='<select name="selectpage">'."\n";
    my ($titles,$symbx) = &getSymbMap();
    my ($curpage)=&Apache::lonnet::decode_symb($symb); 
    my $ctr=0;
    foreach (@$titles) {
	my ($minder,$showtitle) = ($_ =~ /(\d+)\.(.*)/);
	$result.='<option value="'.$$symbx{$_}.'" '.
	    ($$symbx{$_} =~ /$curpage$/ ? 'selected="selected"' : '').
	    '>'.$showtitle.'</option>'."\n";
	$ctr++;
    }
    $result.= '</select>';
    return $result;
}

my %bubble_lines_per_response;     # no. bubble lines for each response.
                                   # index is "symb.part_id"

my %first_bubble_line;             # First bubble line no. for each bubble.

my %subdivided_bubble_lines;       # no. bubble lines for optionresponse, 
                                   # matchresponse or rankresponse, where 
                                   # an individual response can have multiple 
                                   # lines

my %responsetype_per_response;     # responsetype for each response

# Save and restore the bubble lines array to the form env.


sub save_bubble_lines {
    foreach my $line (keys(%bubble_lines_per_response)) {
	$env{"form.scantron.bubblelines.$line"}  = $bubble_lines_per_response{$line};
	$env{"form.scantron.first_bubble_line.$line"} =
	    $first_bubble_line{$line};
        $env{"form.scantron.sub_bubblelines.$line"} = 
            $subdivided_bubble_lines{$line};
        $env{"form.scantron.responsetype.$line"} =
            $responsetype_per_response{$line};
    }
}


sub restore_bubble_lines {
    my $line = 0;
    %bubble_lines_per_response = ();
    while ($env{"form.scantron.bubblelines.$line"}) {
	my $value = $env{"form.scantron.bubblelines.$line"};
	$bubble_lines_per_response{$line} = $value;
	$first_bubble_line{$line}  =
	    $env{"form.scantron.first_bubble_line.$line"};
        $subdivided_bubble_lines{$line} =
            $env{"form.scantron.sub_bubblelines.$line"};
        $responsetype_per_response{$line} =
            $env{"form.scantron.responsetype.$line"};
	$line++;
    }

}

#  Given the parsed scanline, get the response for 
#  'answer' number n:

sub get_response_bubbles {
    my ($parsed_line, $response)  = @_;


    my $bubble_line = $first_bubble_line{$response-1} +1;
    my $bubble_lines= $bubble_lines_per_response{$response-1};
    
    my $selected = "";

    for (my $bline = 0; $bline < $bubble_lines; $bline++) {
	$selected .= $$parsed_line{"scantron.$bubble_line.answer"}.":";
	$bubble_line++;
    }
    return $selected;
}

=pod 

=item scantron_filenames

   Returns a list of the scantron files in the current course 

=cut

sub scantron_filenames {
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $getpropath = 1;
    my @files=&Apache::lonnet::dirlist('userfiles',$cdom,$cname,
                                       $getpropath);
    my @possiblenames;
    foreach my $filename (sort(@files)) {
	($filename)=split(/&/,$filename);
	if ($filename!~/^scantron_orig_/) { next ; }
	$filename=~s/^scantron_orig_//;
	push(@possiblenames,$filename);
    }
    return @possiblenames;
}

=pod 

=item scantron_uploads

   Returns  html drop-down list of scantron files in current course.

 Arguments:
   $file2grade - filename to set as selected in the dropdown

=cut

sub scantron_uploads {
    my ($file2grade) = @_;
    my $result=	'<select name="scantron_selectfile">';
    $result.="<option></option>";
    foreach my $filename (sort(&scantron_filenames())) {
	$result.="<option".($filename eq $file2grade ? ' selected="selected"':'').">$filename</option>\n";
    }
    $result.="</select>";
    return $result;
}

=pod 

=item scantron_scantab

  Returns html drop down of the scantron formats in the scantronformat.tab
  file.

=cut

sub scantron_scantab {
    my $result='<select name="scantron_format">'."\n";
    $result.='<option></option>'."\n";
    my @lines = &get_scantronformat_file();
    if (@lines > 0) {
        foreach my $line (@lines) {
            next if (($line =~ /^\#/) || ($line eq ''));
	    my ($name,$descrip)=split(/:/,$line);
	    $result.='<option value="'.$name.'">'.$descrip.'</option>'."\n";
        }
    }
    $result.='</select>'."\n";
    return $result;
}

=pod

=item get_scantronformat_file

  Returns an array containing lines from the scantron format file for
  the domain of the course.

  If a url for a custom.tab file is listed in domain's configuration.db, 
  lines are from this file.

  Otherwise, if a default.tab has been published in RES space by the 
  domainconfig user, lines are from this file.

  Otherwise, fall back to getting lines from the legacy file on the
  local server:  /home/httpd/lonTabs/default_scantronformat.tab    

=cut

sub get_scantronformat_file {
    my $cdom= $env{'course.'.$env{'request.course.id'}.'.domain'};
    my %domconfig = &Apache::lonnet::get_dom('configuration',['scantron'],$cdom);
    my $gottab = 0;
    my @lines;
    if (ref($domconfig{'scantron'}) eq 'HASH') {
        if ($domconfig{'scantron'}{'scantronformat'} ne '') {
            my $formatfile = &Apache::lonnet::getfile($Apache::lonnet::perlvar{'lonDocRoot'}.$domconfig{'scantron'}{'scantronformat'});
            if ($formatfile ne '-1') {
                @lines = split("\n",$formatfile,-1);
                $gottab = 1;
            }
        }
    }
    if (!$gottab) {
        my $confname = $cdom.'-domainconfig';
        my $default = $Apache::lonnet::perlvar{'lonDocRoot'}.'/res/'.$cdom.'/'.$confname.'/default.tab';
        my $formatfile =  &Apache::lonnet::getfile($default);
        if ($formatfile ne '-1') {
            @lines = split("\n",$formatfile,-1);
            $gottab = 1;
        }
    }
    if (!$gottab) {
        my @domains = &Apache::lonnet::current_machine_domains();
        if (grep(/^\Q$cdom\E$/,@domains)) {
            my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.'/scantronformat.tab');
            @lines = <$fh>;
            close($fh);
        } else {
            my $fh=Apache::File->new($Apache::lonnet::perlvar{'lonTabDir'}.'/default_scantronformat.tab');
            @lines = <$fh>;
            close($fh);
        }
    }
    return @lines;
}

=pod 

=item scantron_CODElist

  Returns html drop down of the saved CODE lists from current course,
  generated from earlier printings.

=cut

sub scantron_CODElist {
    my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
    my @names=&Apache::lonnet::getkeys('CODEs',$cdom,$cnum);
    my $namechoice='<option></option>';
    foreach my $name (sort {uc($a) cmp uc($b)} @names) {
	if ($name =~ /^error: 2 /) { next; }
	if ($name =~ /^type\0/) { next; }
	$namechoice.='<option value="'.$name.'">'.$name.'</option>';
    }
    $namechoice='<select name="scantron_CODElist">'.$namechoice.'</select>';
    return $namechoice;
}

=pod 

=item scantron_CODEunique

  Returns the html for "Each CODE to be used once" radio.

=cut

sub scantron_CODEunique {
    my $result='<span style="white-space: nowrap;">
                 <label><input type="radio" name="scantron_CODEunique"
                        value="yes" checked="checked" />'.&mt('Yes').' </label>
                </span>
                <span style="white-space: nowrap;">
                 <label><input type="radio" name="scantron_CODEunique"
                        value="no" />'.&mt('No').' </label>
                </span>';
    return $result;
}

=pod 

=item scantron_selectphase

  Generates the initial screen to start the bubble sheet process.
  Allows for - starting a grading run.
             - downloading existing scan data (original, corrected
                                                or skipped info)

             - uploading new scan data

 Arguments:
  $r          - The Apache request object
  $file2grade - name of the file that contain the scanned data to score

=cut

sub scantron_selectphase {
    my ($r,$file2grade) = @_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}
    my $sequence_selector=&getSequenceDropDown($symb);
    my $default_form_data=&defaultFormData($symb);
    my $grading_menu_button=&show_grading_menu_form($symb);
    my $file_selector=&scantron_uploads($file2grade);
    my $format_selector=&scantron_scantab();
    my $CODE_selector=&scantron_CODElist();
    my $CODE_unique=&scantron_CODEunique();
    my $result;

    $ssi_error = 0;

    # Chunk of form to prompt for a file to grade and how:

    $result.= '
    <br />
    <form method="post" enctype="multipart/form-data" action="/adm/grades" name="scantron_process">
    <input type="hidden" name="command" value="scantron_warning" />
    '.$default_form_data.'
    '.&Apache::loncommon::start_data_table('LC_scantron_action').'
       '.&Apache::loncommon::start_data_table_header_row().'
            <th colspan="2">
              &nbsp;'.&mt('Specify file and which Folder/Sequence to grade').'
            </th>
       '.&Apache::loncommon::end_data_table_header_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td> '.&mt('Sequence to grade:').' </td><td> '.$sequence_selector.' </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td> '.&mt('Filename of scoring office file:').' </td><td> '.$file_selector.' </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td> '.&mt('Format of data file:').' </td><td> '.$format_selector.' </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td> '.&mt('Saved CODEs to validate against:').' </td><td> '.$CODE_selector.' </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td> '.&mt('Each CODE is only to be used once:').'</td><td> '.$CODE_unique.' </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
	    <td> '.&mt('Options:').' </td>
            <td>
	       <label><input type="checkbox" name="scantron_options_redo" value="redo_skipped"/> '.&mt('Do only previously skipped records').'</label> <br />
               <label><input type="checkbox" name="scantron_options_ignore" value="ignore_corrections"/> '.&mt('Remove all existing corrections').'</label> <br />
               <label><input type="checkbox" name="scantron_options_hidden" value="ignore_hidden"/> '.&mt('Skip hidden resources when grading').'</label>
	    </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td colspan="2">
              <input type="submit" value="'.&mt('Grading: Validate Scantron Records').'" />
            </td>
       '.&Apache::loncommon::end_data_table_row().'
    '.&Apache::loncommon::end_data_table().'
    </form>
';
   
    $r->print($result);

    if (&Apache::lonnet::allowed('usc',$env{'request.role.domain'}) ||
        &Apache::lonnet::allowed('usc',$env{'request.course.id'})) {

	# Chunk of form to prompt for a scantron file upload.

        $r->print('
    <br />
    '.&Apache::loncommon::start_data_table('LC_scantron_action').'
       '.&Apache::loncommon::start_data_table_header_row().'
            <th>
              &nbsp;'.&mt('Specify a Scantron data file to upload.').'
            </th>
       '.&Apache::loncommon::end_data_table_header_row().'
       '.&Apache::loncommon::start_data_table_row().'
            <td>
');
    my $default_form_data=&defaultFormData(&get_symb($r,1));
    my $cdom= $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cnum= $env{'course.'.$env{'request.course.id'}.'.num'};
    $r->print('
              <script type="text/javascript" language="javascript">
    function checkUpload(formname) {
	if (formname.upfile.value == "") {
	    alert("'.&mt('Please use the browse button to select a file from your local directory.').'");
	    return false;
	}
	formname.submit();
    }
              </script>

              <form enctype="multipart/form-data" action="/adm/grades" name="rules" method="post">
                '.$default_form_data.'
                <input name="courseid" type="hidden" value="'.$cnum.'" />
                <input name="domainid" type="hidden" value="'.$cdom.'" />
                <input name="command" value="scantronupload_save" type="hidden" />
                '.&mt('File to upload: [_1]','<input type="file" name="upfile" size="50" />').'
                <br />
                <input type="button" onClick="javascript:checkUpload(this.form);" value="'.&mt('Upload Scantron Data').'" />
              </form>
');

        $r->print('
            </td>
       '.&Apache::loncommon::end_data_table_row().'
       '.&Apache::loncommon::end_data_table().'
');
    }

    # Chunk of the form that prompts to view a scoring office file,
    # corrected file, skipped records in a file.

    $r->print('
   <br />
   <form action="/adm/grades" name="scantron_download">
     '.$default_form_data.'
     <input type="hidden" name="command" value="scantron_download" />
     '.&Apache::loncommon::start_data_table('LC_scantron_action').'
       '.&Apache::loncommon::start_data_table_header_row().'
              <th>
                &nbsp;'.&mt('Download a scoring office file').'
              </th>
       '.&Apache::loncommon::end_data_table_header_row().'
       '.&Apache::loncommon::start_data_table_row().'
              <td> '.&mt('Filename of scoring office file: [_1]',$file_selector).' 
                <br />
                <input type="submit" value="'.&mt('Download: Show List of Associated Files').'" />
       '.&Apache::loncommon::end_data_table_row().'
     '.&Apache::loncommon::end_data_table().'
   </form>
   <br />
');

    &Apache::lonpickcode::code_list($r,2);
    $r->print($grading_menu_button);
    return
}

=pod

=item get_scantron_config

   Parse and return the scantron configuration line selected as a
   hash of configuration file fields.

 Arguments:
    which - the name of the configuration to parse from the file.


 Returns:
            If the named configuration is not in the file, an empty
            hash is returned.
    a hash with the fields
      name         - internal name for the this configuration setup
      description  - text to display to operator that describes this config
      CODElocation - if 0 or the string 'none'
                          - no CODE exists for this config
                     if -1 || the string 'letter'
                          - a CODE exists for this config and is
                            a string of letters
                     Unsupported value (but planned for future support)
                          if a positive integer
                               - The CODE exists as the first n items from
                                 the question section of the form
                          if the string 'number'
                               - The CODE exists for this config and is
                                 a string of numbers
      CODEstart   - (only matter if a CODE exists) column in the line where
                     the CODE starts
      CODElength  - length of the CODE
      IDstart     - column where the student ID number starts
      IDlength    - length of the student ID info
      Qstart      - column where the information from the bubbled
                    'questions' start
      Qlength     - number of columns comprising a single bubble line from
                    the sheet. (usually either 1 or 10)
      Qon         - either a single character representing the character used
                    to signal a bubble was chosen in the positional setup, or
                    the string 'letter' if the letter of the chosen bubble is
                    in the final, or 'number' if a number representing the
                    chosen bubble is in the file (1->A 0->J)
      Qoff        - the character used to represent that a bubble was
                    left blank
      PaperID     - if the scanning process generates a unique number for each
                    sheet scanned the column that this ID number starts in
      PaperIDlength - number of columns that comprise the unique ID number
                      for the sheet of paper
      FirstName   - column that the first name starts in
      FirstNameLength - number of columns that the first name spans
 
      LastName    - column that the last name starts in
      LastNameLength - number of columns that the last name spans

=cut

sub get_scantron_config {
    my ($which) = @_;
    my @lines = &get_scantronformat_file();
    my %config;
    #FIXME probably should move to XML it has already gotten a bit much now
    foreach my $line (@lines) {
	my ($name,$descrip)=split(/:/,$line);
	if ($name ne $which ) { next; }
	chomp($line);
	my @config=split(/:/,$line);
	$config{'name'}=$config[0];
	$config{'description'}=$config[1];
	$config{'CODElocation'}=$config[2];
	$config{'CODEstart'}=$config[3];
	$config{'CODElength'}=$config[4];
	$config{'IDstart'}=$config[5];
	$config{'IDlength'}=$config[6];
	$config{'Qstart'}=$config[7];
 	$config{'Qlength'}=$config[8];
	$config{'Qoff'}=$config[9];
	$config{'Qon'}=$config[10];
	$config{'PaperID'}=$config[11];
	$config{'PaperIDlength'}=$config[12];
	$config{'FirstName'}=$config[13];
	$config{'FirstNamelength'}=$config[14];
	$config{'LastName'}=$config[15];
	$config{'LastNamelength'}=$config[16];
	last;
    }
    return %config;
}

=pod 

=item username_to_idmap

    creates a hash keyed by student id with values of the corresponding
    student username:domain.

  Arguments:

    $classlist - reference to the class list hash. This is a hash
                 keyed by student name:domain  whose elements are references
                 to arrays containing various chunks of information
                 about the student. (See loncoursedata for more info).

  Returns
    %idmap - the constructed hash

=cut

sub username_to_idmap {
    my ($classlist)= @_;
    my %idmap;
    foreach my $student (keys(%$classlist)) {
	$idmap{$classlist->{$student}->[&Apache::loncoursedata::CL_ID]}=
	    $student;
    }
    return %idmap;
}

=pod

=item scantron_fixup_scanline

   Process a requested correction to a scanline.

  Arguments:
    $scantron_config   - hash from &get_scantron_config()
    $scan_data         - hash of correction information 
                          (see &scantron_getfile())
    $line              - existing scanline
    $whichline         - line number of the passed in scanline
    $field             - type of change to process 
                         (either 
                          'ID'     -> correct the student ID number
                          'CODE'   -> correct the CODE
                          'answer' -> fixup the submitted answers)
    
   $args               - hash of additional info,
                          - 'ID' 
                               'newid' -> studentID to use in replacement
                                          of existing one
                          - 'CODE' 
                               'CODE_ignore_dup' - set to true if duplicates
                                                   should be ignored.
	                       'CODE' - is new code or 'use_unfound'
                                        if the existing unfound code should
                                        be used as is
                          - 'answer'
                               'response' - new answer or 'none' if blank
                               'question' - the bubble line to change
                               'questionnum' - the question identifier,
                                               may include subquestion. 

  Returns:
    $line - the modified scanline

  Side effects: 
    $scan_data - may be updated

=cut


sub scantron_fixup_scanline {
    my ($scantron_config,$scan_data,$line,$whichline,$field,$args)=@_;
    if ($field eq 'ID') {
	if (length($args->{'newid'}) > $$scantron_config{'IDlength'}) {
	    return ($line,1,'New value too large');
	}
	if (length($args->{'newid'}) < $$scantron_config{'IDlength'}) {
	    $args->{'newid'}=sprintf('%-'.$$scantron_config{'IDlength'}.'s',
				     $args->{'newid'});
	}
	substr($line,$$scantron_config{'IDstart'}-1,
	       $$scantron_config{'IDlength'})=$args->{'newid'};
	if ($args->{'newid'}=~/^\s*$/) {
	    &scan_data($scan_data,"$whichline.user",
		       $args->{'username'}.':'.$args->{'domain'});
	}
    } elsif ($field eq 'CODE') {
	if ($args->{'CODE_ignore_dup'}) {
	    &scan_data($scan_data,"$whichline.CODE_ignore_dup",'1');
	}
	&scan_data($scan_data,"$whichline.useCODE",'1');
	if ($args->{'CODE'} ne 'use_unfound') {
	    if (length($args->{'CODE'}) > $$scantron_config{'CODElength'}) {
		return ($line,1,'New CODE value too large');
	    }
	    if (length($args->{'CODE'}) < $$scantron_config{'CODElength'}) {
		$args->{'CODE'}=sprintf('%-'.$$scantron_config{'CODElength'}.'s',$args->{'CODE'});
	    }
	    substr($line,$$scantron_config{'CODEstart'}-1,
		   $$scantron_config{'CODElength'})=$args->{'CODE'};
	}
    } elsif ($field eq 'answer') {
	my $length=$scantron_config->{'Qlength'};
	my $off=$scantron_config->{'Qoff'};
	my $on=$scantron_config->{'Qon'};
	my $answer=${off}x$length;
	if ($args->{'response'} eq 'none') {
	    &scan_data($scan_data,
		       "$whichline.no_bubble.".$args->{'questionnum'},'1');
	} else {
	    if ($on eq 'letter') {
		my @alphabet=('A'..'Z');
		$answer=$alphabet[$args->{'response'}];
	    } elsif ($on eq 'number') {
		$answer=$args->{'response'}+1;
		if ($answer == 10) { $answer = '0'; }
	    } else {
		substr($answer,$args->{'response'},1)=$on;
	    }
	    &scan_data($scan_data,
		       "$whichline.no_bubble.".$args->{'questionnum'},undef,'1');
	}
	my $where=$length*($args->{'question'}-1)+$scantron_config->{'Qstart'};
	substr($line,$where-1,$length)=$answer;
    }
    return $line;
}

=pod

=item scan_data

    Edit or look up  an item in the scan_data hash.

  Arguments:
    $scan_data  - The hash (see scantron_getfile)
    $key        - shorthand of the key to edit (actual key is
                  scantronfilename_key).
    $data        - New value of the hash entry.
    $delete      - If true, the entry is removed from the hash.

  Returns:
    The new value of the hash table field (undefined if deleted).

=cut


sub scan_data {
    my ($scan_data,$key,$value,$delete)=@_;
    my $filename=$env{'form.scantron_selectfile'};
    if (defined($value)) {
	$scan_data->{$filename.'_'.$key} = $value;
    }
    if ($delete) { delete($scan_data->{$filename.'_'.$key}); }
    return $scan_data->{$filename.'_'.$key};
}

# ----- These first few routines are general use routines.----

# Return the number of occurences of a pattern in a string.

sub occurence_count {
    my ($string, $pattern) = @_;

    my @matches = ($string =~ /$pattern/g);

    return scalar(@matches);
}


# Take a string known to have digits and convert all the
# digits into letters in the range J,A..I.

sub digits_to_letters {
    my ($input) = @_;

    my @alphabet = ('J', 'A'..'I');

    my @input    = split(//, $input);
    my $output ='';
    for (my $i = 0; $i < scalar(@input); $i++) {
	if ($input[$i] =~ /\d/) {
	    $output .= $alphabet[$input[$i]];
	} else {
	    $output .= $input[$i];
	}
    }
    return $output;
}

=pod 

=item scantron_parse_scanline

  Decodes a scanline from the selected scantron file

 Arguments:
    line             - The text of the scantron file line to process
    whichline        - Line number
    scantron_config  - Hash describing the format of the scantron lines.
    scan_data        - Hash of extra information about the scanline
                       (see scantron_getfile for more information)
    just_header      - True if should not process question answers but only
                       the stuff to the left of the answers.
 Returns:
   Hash containing the result of parsing the scanline

   Keys are all proceeded by the string 'scantron.'

       CODE    - the CODE in use for this scanline
       useCODE - 1 if the CODE is invalid but it usage has been forced
                 by the operator
       CODE_ignore_dup - 1 if the CODE is a duplicated use when unique
                            CODEs were selected, but the usage has been
                            forced by the operator
       ID  - student ID
       PaperID - if used, the ID number printed on the sheet when the 
                 paper was scanned
       FirstName - first name from the sheet
       LastName  - last name from the sheet

     if just_header was not true these key may also exist

       missingerror - a list of bubble ranges that are considered to be answers
                      to a single question that don't have any bubbles filled in.
                      Of the form questionnumber:firstbubblenumber:count.
       doubleerror  - a list of bubble ranges that are considered to be answers
                      to a single question that have more than one bubble filled in.
                      Of the form questionnumber::firstbubblenumber:count
   
                In the above, count is the number of bubble responses in the
                input line needed to represent the possible answers to the question.
                e.g. a radioresponse with 15 choices in an answer sheet with 10 choices
                per line would have count = 2.

       maxquest     - the number of the last bubble line that was parsed

       (<number> starts at 1)
       <number>.answer - zero or more letters representing the selected
                         letters from the scanline for the bubble line 
                         <number>.
                         if blank there was either no bubble or there where
                         multiple bubbles, (consult the keys missingerror and
                         doubleerror if this is an error condition)

=cut

sub scantron_parse_scanline {
    my ($line,$whichline,$scantron_config,$scan_data,$just_header)=@_;

    my %record;
    my $questions=substr($line,$$scantron_config{'Qstart'}-1);  # Answers
    my $data=substr($line,0,$$scantron_config{'Qstart'}-1);     # earlier stuff
    if (!($$scantron_config{'CODElocation'} eq 0 ||
	  $$scantron_config{'CODElocation'} eq 'none')) {
	if ($$scantron_config{'CODElocation'} < 0 ||
	    $$scantron_config{'CODElocation'} eq 'letter' ||
	    $$scantron_config{'CODElocation'} eq 'number') {
	    $record{'scantron.CODE'}=substr($data,
					    $$scantron_config{'CODEstart'}-1,
					    $$scantron_config{'CODElength'});
	    if (&scan_data($scan_data,"$whichline.useCODE")) {
		$record{'scantron.useCODE'}=1;
	    }
	    if (&scan_data($scan_data,"$whichline.CODE_ignore_dup")) {
		$record{'scantron.CODE_ignore_dup'}=1;
	    }
	} else {
	    #FIXME interpret first N questions
	}
    }
    $record{'scantron.ID'}=substr($data,$$scantron_config{'IDstart'}-1,
				  $$scantron_config{'IDlength'});
    $record{'scantron.PaperID'}=
	substr($data,$$scantron_config{'PaperID'}-1,
	       $$scantron_config{'PaperIDlength'});
    $record{'scantron.FirstName'}=
	substr($data,$$scantron_config{'FirstName'}-1,
	       $$scantron_config{'FirstNamelength'});
    $record{'scantron.LastName'}=
	substr($data,$$scantron_config{'LastName'}-1,
	       $$scantron_config{'LastNamelength'});
    if ($just_header) { return \%record; }

    my @alphabet=('A'..'Z');
    my $questnum=0;
    my $ansnum  =1;		# Multiple 'answer lines'/question.

    chomp($questions);		# Get rid of any trailing \n.
    $questions =~ s/\r$//;      # Get rid of trailing \r too (MAC or Win uploads).
    while (length($questions)) {
	my $answers_needed = $bubble_lines_per_response{$questnum};
        my $answer_length  = ($$scantron_config{'Qlength'} * $answers_needed)
                             || 1;
        $questnum++;
        my $quest_id = $questnum;
        my $currentquest = substr($questions,0,$answer_length);
        $questions       = substr($questions,$answer_length);
        if (length($currentquest) < $answer_length) { next; }

        if ($subdivided_bubble_lines{$questnum-1} =~ /,/) {
            my $subquestnum = 1;
            my $subquestions = $currentquest;
            my @subanswers_needed = 
                split(/,/,$subdivided_bubble_lines{$questnum-1});  
            foreach my $subans (@subanswers_needed) {
                my $subans_length =
                    ($$scantron_config{'Qlength'} * $subans)  || 1;
                my $currsubquest = substr($subquestions,0,$subans_length);
                $subquestions   = substr($subquestions,$subans_length);
                $quest_id = "$questnum.$subquestnum";
                if (($$scantron_config{'Qon'} eq 'letter') ||
                    ($$scantron_config{'Qon'} eq 'number')) {
                    $ansnum = &scantron_validator_lettnum($ansnum, 
                        $questnum,$quest_id,$subans,$currsubquest,$whichline,
                        \@alphabet,\%record,$scantron_config,$scan_data);
                } else {
                    $ansnum = &scantron_validator_positional($ansnum,
                        $questnum,$quest_id,$subans,$currsubquest,$whichline,                        \@alphabet,\%record,$scantron_config,$scan_data);
                }
                $subquestnum ++;
            }
        } else {
            if (($$scantron_config{'Qon'} eq 'letter') ||
                ($$scantron_config{'Qon'} eq 'number')) {
                $ansnum = &scantron_validator_lettnum($ansnum,$questnum,
                    $quest_id,$answers_needed,$currentquest,$whichline,
                    \@alphabet,\%record,$scantron_config,$scan_data);
            } else {
                $ansnum = &scantron_validator_positional($ansnum,$questnum,
                    $quest_id,$answers_needed,$currentquest,$whichline,
                    \@alphabet,\%record,$scantron_config,$scan_data);
            }
        }
    }
    $record{'scantron.maxquest'}=$questnum;
    return \%record;
}

sub scantron_validator_lettnum {
    my ($ansnum,$questnum,$quest_id,$answers_needed,$currquest,$whichline,
        $alphabet,$record,$scantron_config,$scan_data) = @_;

    # Qon 'letter' implies for each slot in currquest we have:
    #    ? or * for doubles, a letter in A-Z for a bubble, and
    #    about anything else (esp. a value of Qoff) for missing
    #    bubbles.
    #
    # Qon 'number' implies each slot gives a digit that indexes the
    #    bubbles filled, or Qoff, or a non-number for unbubbled lines,
    #    and * or ? for double bubbles on a single line.
    #

    my $matchon;
    if ($$scantron_config{'Qon'} eq 'letter') {
        $matchon = '[A-Z]';
    } elsif ($$scantron_config{'Qon'} eq 'number') {
        $matchon = '\d';
    }
    my $occurrences = 0;
    if (($responsetype_per_response{$questnum-1} eq 'essayresponse') ||
        ($responsetype_per_response{$questnum-1} eq 'formularesponse') ||
        ($responsetype_per_response{$questnum-1} eq 'stringresponse') ||
        ($responsetype_per_response{$questnum-1} eq 'imageresponse') ||
        ($responsetype_per_response{$questnum-1} eq 'reactionresponse') ||
        ($responsetype_per_response{$questnum-1} eq 'organicresponse')) {
        my @singlelines = split('',$currquest);
        foreach my $entry (@singlelines) {
            $occurrences = &occurence_count($entry,$matchon);
            if ($occurrences > 1) {
                last;
            }
        } 
    } else {
        $occurrences = &occurence_count($currquest,$matchon); 
    }
    if (($currquest =~ /\?/ || $currquest =~ /\*/) || ($occurrences > 1)) {
        push(@{$record->{'scantron.doubleerror'}},$quest_id);
        for (my $ans=0; $ans<$answers_needed; $ans++) {
            my $bubble = substr($currquest,$ans,1);
            if ($bubble =~ /$matchon/ ) {
                if ($$scantron_config{'Qon'} eq 'number') {
                    if ($bubble == 0) {
                        $bubble = 10; 
                    }
                    $record->{"scantron.$ansnum.answer"} = 
                        $alphabet->[$bubble-1];
                } else {
                    $record->{"scantron.$ansnum.answer"} = $bubble;
                }
            } else {
                $record->{"scantron.$ansnum.answer"}='';
            }
            $ansnum++;
        }
    } elsif (!defined($currquest)
            || (&occurence_count($currquest, $$scantron_config{'Qoff'}) == length($currquest))
            || (&occurence_count($currquest,$matchon) == 0)) {
        for (my $ans=0; $ans<$answers_needed; $ans++ ) {
            $record->{"scantron.$ansnum.answer"}='';
            $ansnum++;
        }
        if (!&scan_data($scan_data,"$whichline.no_bubble.$quest_id")) {
            push(@{$record->{'scantron.missingerror'}},$quest_id);
        }
    } else {
        if ($$scantron_config{'Qon'} eq 'number') {
            $currquest = &digits_to_letters($currquest);            
        }
        for (my $ans=0; $ans<$answers_needed; $ans++) {
            my $bubble = substr($currquest,$ans,1);
            $record->{"scantron.$ansnum.answer"} = $bubble;
            $ansnum++;
        }
    }
    return $ansnum;
}

sub scantron_validator_positional {
    my ($ansnum,$questnum,$quest_id,$answers_needed,$currquest,
        $whichline,$alphabet,$record,$scantron_config,$scan_data) = @_;

    # Otherwise there's a positional notation;
    # each bubble line requires Qlength items, and there are filled in
    # bubbles for each case where there 'Qon' characters.
    #

    my @array=split($$scantron_config{'Qon'},$currquest,-1);

    # If the split only gives us one element.. the full length of the
    # answer string, no bubbles are filled in:

    if ($answers_needed eq '') {
        return;
    }

    if (length($array[0]) eq $$scantron_config{'Qlength'}*$answers_needed) {
        for (my $ans=0; $ans<$answers_needed; $ans++ ) {
            $record->{"scantron.$ansnum.answer"}='';
            $ansnum++;
        }
        if (!&scan_data($scan_data,"$whichline.no_bubble.$quest_id")) {
            push(@{$record->{"scantron.missingerror"}},$quest_id);
        }
    } elsif (scalar(@array) == 2) {
        my $location = length($array[0]);
        my $line_num = int($location / $$scantron_config{'Qlength'});
        my $bubble   = $alphabet->[$location % $$scantron_config{'Qlength'}];
        for (my $ans=0; $ans<$answers_needed; $ans++) {
            if ($ans eq $line_num) {
                $record->{"scantron.$ansnum.answer"} = $bubble;
            } else {
                $record->{"scantron.$ansnum.answer"} = ' ';
            }
            $ansnum++;
         }
    } else {
        #  If there's more than one instance of a bubble character
        #  That's a double bubble; with positional notation we can
        #  record all the bubbles filled in as well as the
        #  fact this response consists of multiple bubbles.
        #
        if (($responsetype_per_response{$questnum-1} eq 'essayresponse') ||
            ($responsetype_per_response{$questnum-1} eq 'formularesponse') ||
            ($responsetype_per_response{$questnum-1} eq 'stringresponse') ||
            ($responsetype_per_response{$questnum-1} eq 'imageresponse') ||
            ($responsetype_per_response{$questnum-1} eq 'reactionresponse') ||
            ($responsetype_per_response{$questnum-1} eq 'organicresponse')) {
            my $doubleerror = 0;
            while (($currquest >= $$scantron_config{'Qlength'}) && 
                   (!$doubleerror)) {
               my $currline = substr($currquest,0,$$scantron_config{'Qlength'});
               $currquest = substr($currquest,$$scantron_config{'Qlength'});
               my @currarray = split($$scantron_config{'Qon'},$currline,-1);
               if (length(@currarray) > 2) {
                   $doubleerror = 1;
               } 
            }
            if ($doubleerror) {
                push(@{$record->{'scantron.doubleerror'}},$quest_id);
            }
        } else {
            push(@{$record->{'scantron.doubleerror'}},$quest_id);
        }
        my $item = $ansnum;
        for (my $ans=0; $ans<$answers_needed; $ans++) {
            $record->{"scantron.$item.answer"} = '';
            $item ++;
        }

        my @ans=@array;
        my $i=0;
        my $increment = 0;
        while ($#ans) {
            $i+=length($ans[0]) + $increment;
            my $line   = int($i/$$scantron_config{'Qlength'} + $ansnum);
            my $bubble = $i%$$scantron_config{'Qlength'};
            $record->{"scantron.$line.answer"}.=$alphabet->[$bubble];
            shift(@ans);
            $increment = 1;
        }
        $ansnum += $answers_needed;
    }
    return $ansnum;
}

=pod

=item scantron_add_delay

   Adds an error message that occurred during the grading phase to a
   queue of messages to be shown after grading pass is complete

 Arguments:
   $delayqueue  - arrary ref of hash ref of error messages
   $scanline    - the scanline that caused the error
   $errormesage - the error message
   $errorcode   - a numeric code for the error

 Side Effects:
   updates the $delayqueue to have a new hash ref of the error

=cut

sub scantron_add_delay {
    my ($delayqueue,$scanline,$errormessage,$errorcode)=@_;
    push(@$delayqueue,
	 {'line' => $scanline, 'emsg' => $errormessage,
	  'ecode' => $errorcode }
	 );
}

=pod

=item scantron_find_student

   Finds the username for the current scanline

  Arguments:
   $scantron_record - hash result from scantron_parse_scanline
   $scan_data       - hash of correction information 
                      (see &scantron_getfile() form more information)
   $idmap           - hash from &username_to_idmap()
   $line            - number of current scanline
 
  Returns:
   Either 'username:domain' or undef if unknown

=cut

sub scantron_find_student {
    my ($scantron_record,$scan_data,$idmap,$line)=@_;
    my $scanID=$$scantron_record{'scantron.ID'};
    if ($scanID =~ /^\s*$/) {
 	return &scan_data($scan_data,"$line.user");
    }
    foreach my $id (keys(%$idmap)) {
 	if (lc($id) eq lc($scanID)) {
 	    return $$idmap{$id};
 	}
    }
    return undef;
}

=pod

=item scantron_filter

   Filter sub for lonnavmaps, filters out hidden resources if ignore
   hidden resources was selected

=cut

sub scantron_filter {
    my ($curres)=@_;

    if (ref($curres) && $curres->is_problem()) {
	# if the user has asked to not have either hidden
	# or 'randomout' controlled resources to be graded
	# don't include them
	if ($env{'form.scantron_options_hidden'} eq 'ignore_hidden'
	    && $curres->randomout) {
	    return 0;
	}
	return 1;
    }
    return 0;
}

=pod

=item scantron_process_corrections

   Gets correction information out of submitted form data and corrects
   the scanline

=cut

sub scantron_process_corrections {
    my ($r) = @_;
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my ($scanlines,$scan_data)=&scantron_getfile();
    my $classlist=&Apache::loncoursedata::get_classlist();
    my $which=$env{'form.scantron_line'};
    my $line=&scantron_get_line($scanlines,$scan_data,$which);
    my ($skip,$err,$errmsg);
    if ($env{'form.scantron_skip_record'}) {
	$skip=1;
    } elsif ($env{'form.scantron_corrections'} =~ /^(duplicate|incorrect)ID$/) {
	my $newstudent=$env{'form.scantron_username'}.':'.
	    $env{'form.scantron_domain'};
	my $newid=$classlist->{$newstudent}->[&Apache::loncoursedata::CL_ID];
	($line,$err,$errmsg)=
	    &scantron_fixup_scanline(\%scantron_config,$scan_data,$line,$which,
				     'ID',{'newid'=>$newid,
				    'username'=>$env{'form.scantron_username'},
				    'domain'=>$env{'form.scantron_domain'}});
    } elsif ($env{'form.scantron_corrections'} =~ /^(duplicate|incorrect)CODE$/) {
	my $resolution=$env{'form.scantron_CODE_resolution'};
	my $newCODE;
	my %args;
	if      ($resolution eq 'use_unfound') {
	    $newCODE='use_unfound';
	} elsif ($resolution eq 'use_found') {
	    $newCODE=$env{'form.scantron_CODE_selectedvalue'};
	} elsif ($resolution eq 'use_typed') {
	    $newCODE=$env{'form.scantron_CODE_newvalue'};
	} elsif ($resolution =~ /^use_closest_(\d+)/) {
	    $newCODE=$env{"form.scantron_CODE_closest_$1"};
	}
	if ($env{'form.scantron_corrections'} eq 'duplicateCODE') {
	    $args{'CODE_ignore_dup'}=1;
	}
	$args{'CODE'}=$newCODE;
	($line,$err,$errmsg)=
	    &scantron_fixup_scanline(\%scantron_config,$scan_data,$line,$which,
				     'CODE',\%args);
    } elsif ($env{'form.scantron_corrections'} =~ /^(missing|double)bubble$/) {
	foreach my $question (split(',',$env{'form.scantron_questions'})) {
	    ($line,$err,$errmsg)=
		&scantron_fixup_scanline(\%scantron_config,$scan_data,$line,
					 $which,'answer',
					 { 'question'=>$question,
		      		   'response'=>$env{"form.scantron_correct_Q_$question"},
                                   'questionnum'=>$env{"form.scantron_questionnum_Q_$question"}});
	    if ($err) { last; }
	}
    }
    if ($err) {
	$r->print("<span class=\"LC_warning\">Unable to accept last correction, an error occurred :$errmsg:</span>");
    } else {
	&scantron_put_line($scanlines,$scan_data,$which,$line,$skip);
	&scantron_putfile($scanlines,$scan_data);
    }
}

=pod

=item reset_skipping_status

   Forgets the current set of remember skipped scanlines (and thus
   reverts back to considering all lines in the
   scantron_skipped_<filename> file)

=cut

sub reset_skipping_status {
    my ($scanlines,$scan_data)=&scantron_getfile();
    &scan_data($scan_data,'remember_skipping',undef,1);
    &scantron_putfile(undef,$scan_data);
}

=pod

=item start_skipping

   Marks a scanline to be skipped. 

=cut

sub start_skipping {
    my ($scan_data,$i)=@_;
    my %remembered=split(':',&scan_data($scan_data,'remember_skipping'));
    if ($env{'form.scantron_options_redo'} =~ /^redo_/) {
	$remembered{$i}=2;
    } else {
	$remembered{$i}=1;
    }
    &scan_data($scan_data,'remember_skipping',join(':',%remembered));
}

=pod

=item should_be_skipped

   Checks whether a scanline should be skipped.

=cut

sub should_be_skipped {
    my ($scanlines,$scan_data,$i)=@_;
    if ($env{'form.scantron_options_redo'} !~ /^redo_/) {
	# not redoing old skips
	if ($scanlines->{'skipped'}[$i]) { return 1; }
	return 0;
    }
    my %remembered=split(':',&scan_data($scan_data,'remember_skipping'));

    if (exists($remembered{$i}) && $remembered{$i} != 2 ) {
	return 0;
    }
    return 1;
}

=pod

=item remember_current_skipped

   Discovers what scanlines are in the scantron_skipped_<filename>
   file and remembers them into scan_data for later use.

=cut

sub remember_current_skipped {
    my ($scanlines,$scan_data)=&scantron_getfile();
    my %to_remember;
    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	if ($scanlines->{'skipped'}[$i]) {
	    $to_remember{$i}=1;
	}
    }

    &scan_data($scan_data,'remember_skipping',join(':',%to_remember));
    &scantron_putfile(undef,$scan_data);
}

=pod

=item check_for_error

    Checks if there was an error when attempting to remove a specific
    scantron_.. bubble sheet data file. Prints out an error if
    something went wrong.

=cut

sub check_for_error {
    my ($r,$result)=@_;
    if ($result ne 'ok' && $result ne 'not_found' ) {
	$r->print(&mt("An error occurred ([_1]) when trying to remove the existing corrections.",$result));
    }
}

=pod

=item scantron_warning_screen

   Interstitial screen to make sure the operator has selected the
   correct options before we start the validation phase.

=cut

sub scantron_warning_screen {
    my ($button_text)=@_;
    my $title=&Apache::lonnet::gettitle($env{'form.selectpage'});
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my $CODElist;
    if ($scantron_config{'CODElocation'} &&
	$scantron_config{'CODEstart'} &&
	$scantron_config{'CODElength'}) {
	$CODElist=$env{'form.scantron_CODElist'};
	if ($env{'form.scantron_CODElist'} eq '') { $CODElist='<span class="LC_warning">None</span>'; }
	$CODElist=
	    '<tr><td><b>'.&mt('List of CODES to validate against:').'</b></td><td><tt>'.
	    $env{'form.scantron_CODElist'}.'</tt></td></tr>';
    }
    return ('
<p>
<span class="LC_warning">
'.&mt('Please double check the information below before clicking on \'[_1]\'',&mt($button_text)).'</span>
</p>
<table>
<tr><td><b>'.&mt('Sequence to be Graded:').'</b></td><td>'.$title.'</td></tr>
<tr><td><b>'.&mt('Data File that will be used:').'</b></td><td><tt>'.$env{'form.scantron_selectfile'}.'</tt></td></tr>
'.$CODElist.'
</table>
<br />
<p> '.&mt('If this information is correct, please click on \'[_1]\'.',&mt($button_text)).'</p>
<p> '.&mt('If something is incorrect, please click the \'Grading Menu\' button to start over.').'</p>

<br />
');
}

=pod

=item scantron_do_warning

   Check if the operator has picked something for all required
   fields. Error out if something is missing.

=cut

sub scantron_do_warning {
    my ($r)=@_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}
    my $default_form_data=&defaultFormData($symb);
    $r->print(&scantron_form_start().$default_form_data);
    if ( $env{'form.selectpage'} eq '' ||
	 $env{'form.scantron_selectfile'} eq '' ||
	 $env{'form.scantron_format'} eq '' ) {
	$r->print("<p>".&mt('You have forgetten to specify some information. Please go Back and try again.')."</p>");
	if ( $env{'form.selectpage'} eq '') {
	    $r->print('<p><span class="LC_error">'.&mt('You have not selected a Sequence to grade').'</span></p>');
	} 
	if ( $env{'form.scantron_selectfile'} eq '') {
	    $r->print('<p><span class="LC_error">'.&mt('You have not selected a file that contains the student\'s response data.').'</span></p>');
	} 
	if ( $env{'form.scantron_format'} eq '') {
	    $r->print('<p><span class="LC_error">'.&mt('You have not selected a the format of the student\'s response data.').'</span></p>');
	} 
    } else {
	my $warning=&scantron_warning_screen('Grading: Validate Records');
	$r->print('
'.$warning.'
<input type="submit" name="submit" value="'.&mt('Grading: Validate Records').'" />
<input type="hidden" name="command" value="scantron_validate" />
');
    }
    $r->print("</form><br />".&show_grading_menu_form($symb));
    return '';
}

=pod

=item scantron_form_start

    html hidden input for remembering all selected grading options

=cut

sub scantron_form_start {
    my ($max_bubble)=@_;
    my $result= <<SCANTRONFORM;
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="scantronupload">
  <input type="hidden" name="selectpage" value="$env{'form.selectpage'}" />
  <input type="hidden" name="scantron_format" value="$env{'form.scantron_format'}" />
  <input type="hidden" name="scantron_selectfile" value="$env{'form.scantron_selectfile'}" />
  <input type="hidden" name="scantron_maxbubble" value="$max_bubble" />
  <input type="hidden" name="scantron_CODElist" value="$env{'form.scantron_CODElist'}" />
  <input type="hidden" name="scantron_CODEunique" value="$env{'form.scantron_CODEunique'}" />
  <input type="hidden" name="scantron_options_redo" value="$env{'form.scantron_options_redo'}" />
  <input type="hidden" name="scantron_options_ignore" value="$env{'form.scantron_options_ignore'}" />
  <input type="hidden" name="scantron_options_hidden" value="$env{'form.scantron_options_hidden'}" />
SCANTRONFORM

  my $line = 0;
    while (defined($env{"form.scantron.bubblelines.$line"})) {
       my $chunk =
	   '<input type="hidden" name="scantron.bubblelines.'.$line.'" value="'.$env{"form.scantron.bubblelines.$line"}.'" />'."\n";
       $chunk .=
	   '<input type="hidden" name="scantron.first_bubble_line.'.$line.'" value="'.$env{"form.scantron.first_bubble_line.$line"}.'" />'."\n";
       $chunk .= 
           '<input type="hidden" name="scantron.sub_bubblelines.'.$line.'" value="'.$env{"form.scantron.sub_bubblelines.$line"}.'" />'."\n";
       $chunk .=
           '<input type="hidden" name="scantron.responsetype.'.$line.'" value="'.$env{"form.scantron.responsetype.$line"}.'" />'."\n";
       $result .= $chunk;
       $line++;
   }
    return $result;
}

=pod

=item scantron_validate_file

    Dispatch routine for doing validation of a bubble sheet data file.

    Also processes any necessary information resets that need to
    occur before validation begins (ignore previous corrections,
    restarting the skipped records processing)

=cut

sub scantron_validate_file {
    my ($r) = @_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}
    my $default_form_data=&defaultFormData($symb);
    
    # do the detection of only doing skipped records first befroe we delete
    # them when doing the corrections reset
    if ($env{'form.scantron_options_redo'} ne 'redo_skipped_ready') {
	&reset_skipping_status();
    }
    if ($env{'form.scantron_options_redo'} eq 'redo_skipped') {
	&remember_current_skipped();
	$env{'form.scantron_options_redo'}='redo_skipped_ready';
    }

    if ($env{'form.scantron_options_ignore'} eq 'ignore_corrections') {
	&check_for_error($r,&scantron_remove_file('corrected'));
	&check_for_error($r,&scantron_remove_file('skipped'));
	&check_for_error($r,&scantron_remove_scan_data());
	$env{'form.scantron_options_ignore'}='done';
    }

    if ($env{'form.scantron_corrections'}) {
	&scantron_process_corrections($r);
    }
    $r->print('<p>'.&mt('Gathering necessary information.').'</p>');$r->rflush();
    #get the student pick code ready
    $r->print(&Apache::loncommon::studentbrowser_javascript());
    my $max_bubble=&scantron_get_maxbubble();
    my $result=&scantron_form_start($max_bubble).$default_form_data;
    $r->print($result);
    
    my @validate_phases=( 'sequence',
			  'ID',
			  'CODE',
			  'doublebubble',
			  'missingbubbles');
    if (!$env{'form.validatepass'}) {
	$env{'form.validatepass'} = 0;
    }
    my $currentphase=$env{'form.validatepass'};


    my $stop=0;
    while (!$stop && $currentphase < scalar(@validate_phases)) {
	$r->print(&mt('Validating '.$validate_phases[$currentphase]).'<br />');
	$r->rflush();
	my $which="scantron_validate_".$validate_phases[$currentphase];
	{
	    no strict 'refs';
	    ($stop,$currentphase)=&$which($r,$currentphase);
	}
    }
    if (!$stop) {
	my $warning=&scantron_warning_screen('Start Grading');
	$r->print(&mt('Validation process complete.').'<br />
'.$warning.'
<input type="submit" name="submit" value="'.&mt('Start Grading').'" />
<input type="hidden" name="command" value="scantron_process" />
');

    } else {
	$r->print('<input type="hidden" name="command" value="scantron_validate" />');
	$r->print("<input type='hidden' name='validatepass' value='".$currentphase."' />");
    }
    if ($stop) {
	if ($validate_phases[$currentphase] eq 'sequence') {
	    $r->print('<input type="submit" name="submit" value="'.&mt('Ignore -&gt;').' " />');
	    $r->print(' '.&mt('this error').' <br />');

	    $r->print(" <p>".&mt("Or click the 'Grading Menu' button to start over.")."</p>");
	} else {
            if ($validate_phases[$currentphase] eq 'doublebubble' || $validate_phases[$currentphase] eq 'missingbubbles') {
	        $r->print('<input type="button" name="submitbutton" value="'.&mt('Continue -&gt;').'" onclick="javascript:verify_bubble_radio(this.form)" />');
            } else {
                $r->print('<input type="submit" name="submit" value="'.&mt('Continue -&gt;').'" />');
            }
	    $r->print(' '.&mt('using corrected info').' <br />');
	    $r->print("<input type='submit' value='".&mt("Skip")."' name='scantron_skip_record' />");
	    $r->print(" ".&mt("this scanline saving it for later."));
	}
    }
    $r->print(" </form><br />".&show_grading_menu_form($symb));
    return '';
}


=pod

=item scantron_remove_file

   Removes the requested bubble sheet data file, makes sure that
   scantron_original_<filename> is never removed


=cut

sub scantron_remove_file {
    my ($which)=@_;
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my $file='scantron_';
    if ($which eq 'corrected' || $which eq 'skipped') {
	$file.=$which.'_';
    } else {
	return 'refused';
    }
    $file.=$env{'form.scantron_selectfile'};
    return &Apache::lonnet::removeuserfile($cname,$cdom,$file);
}


=pod

=item scantron_remove_scan_data

   Removes all scan_data correction for the requested bubble sheet
   data file.  (In the case that both the are doing skipped records we need
   to remember the old skipped lines for the time being so that element
   persists for a while.)

=cut

sub scantron_remove_scan_data {
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my @keys=&Apache::lonnet::getkeys('nohist_scantrondata',$cdom,$cname);
    my @todelete;
    my $filename=$env{'form.scantron_selectfile'};
    foreach my $key (@keys) {
	if ($key=~/^\Q$filename\E_/) {
	    if ($env{'form.scantron_options_redo'} eq 'redo_skipped_ready' &&
		$key=~/remember_skipping/) {
		next;
	    }
	    push(@todelete,$key);
	}
    }
    my $result;
    if (@todelete) {
	$result = &Apache::lonnet::del('nohist_scantrondata',
				       \@todelete,$cdom,$cname);
    } else {
	$result = 'ok';
    }
    return $result;
}


=pod

=item scantron_getfile

    Fetches the requested bubble sheet data file (all 3 versions), and
    the scan_data hash
  
  Arguments:
    None

  Returns:
    2 hash references

     - first one has 
         orig      -
         corrected -
         skipped   -  each of which points to an array ref of the specified
                      file broken up into individual lines
         count     - number of scanlines
 
     - second is the scan_data hash possible keys are
       ($number refers to scanline numbered $number and thus the key affects
        only that scanline
        $bubline refers to the specific bubble line element and the aspects
        refers to that specific bubble line element)

       $number.user - username:domain to use
       $number.CODE_ignore_dup 
                    - ignore the duplicate CODE error 
       $number.useCODE
                    - use the CODE in the scanline as is
       $number.no_bubble.$bubline
                    - it is valid that there is no bubbled in bubble
                      at $number $bubline
       remember_skipping
                    - a frozen hash containing keys of $number and values
                      of either 
                        1 - we are on a 'do skipped records pass' and plan
                            on processing this line
                        2 - we are on a 'do skipped records pass' and this
                            scanline has been marked to skip yet again

=cut

sub scantron_getfile {
    #FIXME really would prefer a scantron directory
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my $lines;
    $lines=&Apache::lonnet::getfile('/uploaded/'.$cdom.'/'.$cname.'/'.
		       'scantron_orig_'.$env{'form.scantron_selectfile'});
    my %scanlines;
    $scanlines{'orig'}=[(split("\n",$lines,-1))];
    my $temp=$scanlines{'orig'};
    $scanlines{'count'}=$#$temp;

    $lines=&Apache::lonnet::getfile('/uploaded/'.$cdom.'/'.$cname.'/'.
		       'scantron_corrected_'.$env{'form.scantron_selectfile'});
    if ($lines eq '-1') {
	$scanlines{'corrected'}=[];
    } else {
	$scanlines{'corrected'}=[(split("\n",$lines,-1))];
    }
    $lines=&Apache::lonnet::getfile('/uploaded/'.$cdom.'/'.$cname.'/'.
		       'scantron_skipped_'.$env{'form.scantron_selectfile'});
    if ($lines eq '-1') {
	$scanlines{'skipped'}=[];
    } else {
	$scanlines{'skipped'}=[(split("\n",$lines,-1))];
    }
    my @tmp=&Apache::lonnet::dump('nohist_scantrondata',$cdom,$cname);
    if ($tmp[0] =~ /^(error:|no_such_host)/) { @tmp=(); }
    my %scan_data = @tmp;
    return (\%scanlines,\%scan_data);
}

=pod

=item lonnet_putfile

   Wrapper routine to call &Apache::lonnet::finishuserfileupload

 Arguments:
   $contents - data to store
   $filename - filename to store $contents into

 Returns:
   result value from &Apache::lonnet::finishuserfileupload

=cut

sub lonnet_putfile {
    my ($contents,$filename)=@_;
    my $docuname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $docudom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    $env{'form.sillywaytopassafilearound'}=$contents;
    &Apache::lonnet::finishuserfileupload($docuname,$docudom,'sillywaytopassafilearound',$filename);

}

=pod

=item scantron_putfile

    Stores the current version of the bubble sheet data files, and the
    scan_data hash. (Does not modify the original version only the
    corrected and skipped versions.

 Arguments:
    $scanlines - hash ref that looks like the first return value from
                 &scantron_getfile()
    $scan_data - hash ref that looks like the second return value from
                 &scantron_getfile()

=cut

sub scantron_putfile {
    my ($scanlines,$scan_data) = @_;
    #FIXME really would prefer a scantron directory
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    if ($scanlines) {
	my $prefix='scantron_';
# no need to update orig, shouldn't change
#   &lonnet_putfile(join("\n",@{$scanlines->{'orig'}}),$prefix.'orig_'.
#		    $env{'form.scantron_selectfile'});
	&lonnet_putfile(join("\n",@{$scanlines->{'corrected'}}),
			$prefix.'corrected_'.
			$env{'form.scantron_selectfile'});
	&lonnet_putfile(join("\n",@{$scanlines->{'skipped'}}),
			$prefix.'skipped_'.
			$env{'form.scantron_selectfile'});
    }
    &Apache::lonnet::put('nohist_scantrondata',$scan_data,$cdom,$cname);
}

=pod

=item scantron_get_line

   Returns the correct version of the scanline

 Arguments:
    $scanlines - hash ref that looks like the first return value from
                 &scantron_getfile()
    $scan_data - hash ref that looks like the second return value from
                 &scantron_getfile()
    $i         - number of the requested line (starts at 0)

 Returns:
   A scanline, (either the original or the corrected one if it
   exists), or undef if the requested scanline should be
   skipped. (Either because it's an skipped scanline, or it's an
   unskipped scanline and we are not doing a 'do skipped scanlines'
   pass.

=cut

sub scantron_get_line {
    my ($scanlines,$scan_data,$i)=@_;
    if (&should_be_skipped($scanlines,$scan_data,$i)) { return undef; }
    #if ($scanlines->{'skipped'}[$i]) { return undef; }
    if ($scanlines->{'corrected'}[$i]) {return $scanlines->{'corrected'}[$i];}
    return $scanlines->{'orig'}[$i]; 
}

=pod

=item scantron_todo_count

    Counts the number of scanlines that need processing.

 Arguments:
    $scanlines - hash ref that looks like the first return value from
                 &scantron_getfile()
    $scan_data - hash ref that looks like the second return value from
                 &scantron_getfile()

 Returns:
    $count - number of scanlines to process

=cut

sub get_todo_count {
    my ($scanlines,$scan_data)=@_;
    my $count=0;
    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	my $line=&scantron_get_line($scanlines,$scan_data,$i);
	if ($line=~/^[\s\cz]*$/) { next; }
	$count++;
    }
    return $count;
}

=pod

=item scantron_put_line

    Updates the 'corrected' or 'skipped' versions of the bubble sheet
    data file.

 Arguments:
    $scanlines - hash ref that looks like the first return value from
                 &scantron_getfile()
    $scan_data - hash ref that looks like the second return value from
                 &scantron_getfile()
    $i         - line number to update
    $newline   - contents of the updated scanline
    $skip      - if true make the line for skipping and update the
                 'skipped' file

=cut

sub scantron_put_line {
    my ($scanlines,$scan_data,$i,$newline,$skip)=@_;
    if ($skip) {
	$scanlines->{'skipped'}[$i]=$newline;
	&start_skipping($scan_data,$i);
	return;
    }
    $scanlines->{'corrected'}[$i]=$newline;
}

=pod

=item scantron_clear_skip

   Remove a line from the 'skipped' file

 Arguments:
    $scanlines - hash ref that looks like the first return value from
                 &scantron_getfile()
    $scan_data - hash ref that looks like the second return value from
                 &scantron_getfile()
    $i         - line number to update

=cut

sub scantron_clear_skip {
    my ($scanlines,$scan_data,$i)=@_;
    if (exists($scanlines->{'skipped'}[$i])) {
	undef($scanlines->{'skipped'}[$i]);
	return 1;
    }
    return 0;
}

=pod

=item scantron_filter_not_exam

   Filter routine used by &Apache::lonnavmaps::retrieveResources(), to
   filter out resources that are not marked as 'exam' mode

=cut

sub scantron_filter_not_exam {
    my ($curres)=@_;
    
    if (ref($curres) && $curres->is_problem() && !$curres->is_exam()) {
	# if the user has asked to not have either hidden
	# or 'randomout' controlled resources to be graded
	# don't include them
	if ($env{'form.scantron_options_hidden'} eq 'ignore_hidden'
	    && $curres->randomout) {
	    return 0;
	}
	return 1;
    }
    return 0;
}

=pod

=item scantron_validate_sequence

    Validates the selected sequence, checking for resource that are
    not set to exam mode.

=cut

sub scantron_validate_sequence {
    my ($r,$currentphase) = @_;

    my $navmap=Apache::lonnavmaps::navmap->new();
    my (undef,undef,$sequence)=
	&Apache::lonnet::decode_symb($env{'form.selectpage'});

    my $map=$navmap->getResourceByUrl($sequence);

    $r->print('<input type="hidden" name="validate_sequence_exam"
                                    value="ignore" />');
    if ($env{'form.validate_sequence_exam'} ne 'ignore') {
	my @resources=
	    $navmap->retrieveResources($map,\&scantron_filter_not_exam,1,0);
	if (@resources) {
	    $r->print("<p>".&mt('Some resources in the sequence currently are not set to exam mode. Grading these resources currently may not work correctly.')."</p>");
	    return (1,$currentphase);
	}
    }

    return (0,$currentphase+1);
}

=pod

=item scantron_validate_ID

   Validates all scanlines in the selected file to not have any
   invalid or underspecified student IDs

=cut

sub scantron_validate_ID {
    my ($r,$currentphase) = @_;
    
    #get student info
    my $classlist=&Apache::loncoursedata::get_classlist();
    my %idmap=&username_to_idmap($classlist);

    #get scantron line setup
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my ($scanlines,$scan_data)=&scantron_getfile();
    
    &scantron_get_maxbubble();	# parse needs the bubble_lines.. array.

    my %found=('ids'=>{},'usernames'=>{});
    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	my $line=&scantron_get_line($scanlines,$scan_data,$i);
	if ($line=~/^[\s\cz]*$/) { next; }
	my $scan_record=&scantron_parse_scanline($line,$i,\%scantron_config,
						 $scan_data);
	my $id=$$scan_record{'scantron.ID'};
	my $found;
	foreach my $checkid (keys(%idmap)) {
	    if (lc($checkid) eq lc($id)) { $found=$checkid;last; }
	}
	if ($found) {
	    my $username=$idmap{$found};
	    if ($found{'ids'}{$found}) {
		&scantron_get_correction($r,$i,$scan_record,\%scantron_config,
					 $line,'duplicateID',$found);
		return(1,$currentphase);
	    } elsif ($found{'usernames'}{$username}) {
		&scantron_get_correction($r,$i,$scan_record,\%scantron_config,
					 $line,'duplicateID',$username);
		return(1,$currentphase);
	    }
	    #FIXME store away line we previously saw the ID on to use above
	    $found{'ids'}{$found}++;
	    $found{'usernames'}{$username}++;
	} else {
	    if ($id =~ /^\s*$/) {
		my $username=&scan_data($scan_data,"$i.user");
		if (defined($username) && $found{'usernames'}{$username}) {
		    &scantron_get_correction($r,$i,$scan_record,
					     \%scantron_config,
					     $line,'duplicateID',$username);
		    return(1,$currentphase);
		} elsif (!defined($username)) {
		    &scantron_get_correction($r,$i,$scan_record,
					     \%scantron_config,
					     $line,'incorrectID');
		    return(1,$currentphase);
		}
		$found{'usernames'}{$username}++;
	    } else {
		&scantron_get_correction($r,$i,$scan_record,\%scantron_config,
					 $line,'incorrectID');
		return(1,$currentphase);
	    }
	}
    }

    return (0,$currentphase+1);
}

=pod

=item scantron_get_correction

   Builds the interface screen to interact with the operator to fix a
   specific error condition in a specific scanline

 Arguments:
    $r           - Apache request object
    $i           - number of the current scanline
    $scan_record - hash ref as returned from &scantron_parse_scanline()
    $scan_config - hash ref as returned from &get_scantron_config()
    $line        - full contents of the current scanline
    $error       - error condition, valid values are
                   'incorrectCODE', 'duplicateCODE',
                   'doublebubble', 'missingbubble',
                   'duplicateID', 'incorrectID'
    $arg         - extra information needed
       For errors:
         - duplicateID   - paper number that this studentID was seen before on
         - duplicateCODE - array ref of the paper numbers this CODE was
                           seen on before
         - incorrectCODE - current incorrect CODE 
         - doublebubble  - array ref of the bubble lines that have double
                           bubble errors
         - missingbubble - array ref of the bubble lines that have missing
                           bubble errors

=cut

sub scantron_get_correction {
    my ($r,$i,$scan_record,$scan_config,$line,$error,$arg)=@_;
#FIXME in the case of a duplicated ID the previous line, probably need
#to show both the current line and the previous one and allow skipping
#the previous one or the current one

    if ( $$scan_record{'scantron.PaperID'} =~ /\S/) {
	$r->print("<p>".&mt("<b>An error was detected ($error)</b>".
			    " for PaperID <tt>[_1]</tt>",
			    $$scan_record{'scantron.PaperID'})."</p> \n");
    } else {
	$r->print("<p>".&mt("<b>An error was detected ($error)</b>".
			    " in scanline [_1] <pre>[_2]</pre>",
			    $i,$line)."</p> \n");
    }
    my $message="<p>".&mt("The ID on the form is  <tt>[_1]</tt><br />".
			  "The name on the paper is [_2],[_3]",
			  $$scan_record{'scantron.ID'},
			  $$scan_record{'scantron.LastName'},
			  $$scan_record{'scantron.FirstName'})."</p>";

    $r->print('<input type="hidden" name="scantron_corrections" value="'.$error.'" />'."\n");
    $r->print('<input type="hidden" name="scantron_line" value="'.$i.'" />'."\n");
                           # Array populated for doublebubble or
    my @lines_to_correct;  # missingbubble errors to build javascript
                           # to validate radio button checking   

    if ($error =~ /ID$/) {
	if ($error eq 'incorrectID') {
	    $r->print("<p>".&mt("The encoded ID is not in the classlist").
		      "</p>\n");
	} elsif ($error eq 'duplicateID') {
	    $r->print("<p>".&mt("The encoded ID has also been used by a previous paper [_1]",$arg)."</p>\n");
	}
	$r->print($message);
	$r->print("<p>".&mt("How should I handle this?")." <br /> \n");
	$r->print("\n<ul><li> ");
	#FIXME it would be nice if this sent back the user ID and
	#could do partial userID matches
	$r->print(&Apache::loncommon::selectstudent_link('scantronupload',
				       'scantron_username','scantron_domain'));
	$r->print(": <input type='text' name='scantron_username' value='' />");
	$r->print("\n@".
		 &Apache::loncommon::select_dom_form($env{'request.role.domain'},'scantron_domain'));

	$r->print('</li>');
    } elsif ($error =~ /CODE$/) {
	if ($error eq 'incorrectCODE') {
	    $r->print("<p>".&mt("The encoded CODE is not in the list of possible CODEs.")."</p>\n");
	} elsif ($error eq 'duplicateCODE') {
	    $r->print("<p>".&mt("The encoded CODE has also been used by a previous paper [_1], and CODEs are supposed to be unique.",join(', ',@{$arg}))."</p>\n");
	}
	$r->print("<p>".&mt("The CODE on the form is  <tt>'[_1]'</tt>",
			    $$scan_record{'scantron.CODE'})."<br />\n");
	$r->print($message);
	$r->print("<p>".&mt("How should I handle this?")." <br /> \n");
	$r->print("\n<br /> ");
	my $i=0;
	if ($error eq 'incorrectCODE' 
	    && $$scan_record{'scantron.CODE'}=~/\S/ ) {
	    my ($max,$closest)=&scantron_get_closely_matching_CODEs($arg,$$scan_record{'scantron.CODE'});
	    if ($closest > 0) {
		foreach my $testcode (@{$closest}) {
		    my $checked='';
		    if (!$i) { $checked=' checked="checked" '; }
		    $r->print("
   <label>
       <input type='radio' name='scantron_CODE_resolution' value='use_closest_$i' $checked />
       ".&mt("Use the similar CODE [_1] instead.",
	    "<b><tt>".$testcode."</tt></b>")."
    </label>
    <input type='hidden' name='scantron_CODE_closest_$i' value='$testcode' />");
		    $r->print("\n<br />");
		    $i++;
		}
	    }
	}
	if ($$scan_record{'scantron.CODE'}=~/\S/ ) {
	    my $checked; if (!$i) { $checked=' checked="checked" '; }
	    $r->print("
    <label>
        <input type='radio' name='scantron_CODE_resolution' value='use_unfound' $checked />
       ".&mt("Use the CODE [_1] that is was on the paper, ignoring the error.",
	     "<b><tt>".$$scan_record{'scantron.CODE'}."</tt></b>")."
    </label>");
	    $r->print("\n<br />");
	}

	$r->print(<<ENDSCRIPT);
<script type="text/javascript">
function change_radio(field) {
    var slct=document.scantronupload.scantron_CODE_resolution;
    var i;
    for (i=0;i<slct.length;i++) {
        if (slct[i].value==field) { slct[i].checked=true; }
    }
}
</script>
ENDSCRIPT
	my $href="/adm/pickcode?".
	   "form=".&escape("scantronupload").
	   "&scantron_format=".&escape($env{'form.scantron_format'}).
	   "&scantron_CODElist=".&escape($env{'form.scantron_CODElist'}).
	   "&curCODE=".&escape($$scan_record{'scantron.CODE'}).
	   "&scantron_selectfile=".&escape($env{'form.scantron_selectfile'});
	if ($env{'form.scantron_CODElist'} =~ /\S/) { 
	    $r->print("
    <label>
       <input type='radio' name='scantron_CODE_resolution' value='use_found' />
       ".&mt("[_1]Select[_2] a CODE from the list of all CODEs and use it.",
	     "<a target='_blank' href='$href'>","</a>")."
    </label> 
    ".&mt("Selected CODE is [_1]","<input readonly='true' type='text' size='8' name='scantron_CODE_selectedvalue' onfocus=\"javascript:change_radio('use_found')\" onchange=\"javascript:change_radio('use_found')\" />"));
	    $r->print("\n<br />");
	}
	$r->print("
    <label>
       <input type='radio' name='scantron_CODE_resolution' value='use_typed' />
       ".&mt("Use [_1] as the CODE.",
	     "</label><input type='text' size='8' name='scantron_CODE_newvalue' onfocus=\"javascript:change_radio('use_typed')\" onkeypress=\"javascript:change_radio('use_typed')\" />"));
	$r->print("\n<br /><br />");
    } elsif ($error eq 'doublebubble') {
	$r->print("<p>".&mt("There have been multiple bubbles scanned for some question(s)")."</p>\n");

	# The form field scantron_questions is acutally a list of line numbers.
	# represented by this form so:

	my $line_list = &questions_to_line_list($arg);

	$r->print('<input type="hidden" name="scantron_questions" value="'.
		  $line_list.'" />');
	$r->print($message);
	$r->print("<p>".&mt("Please indicate which bubble should be used for grading")."</p>");
	foreach my $question (@{$arg}) {
	    my @linenums = &prompt_for_corrections($r,$question,$scan_config,
                                                   $scan_record, $error);
            push (@lines_to_correct,@linenums);
	}
        $r->print(&verify_bubbles_checked(@lines_to_correct));
    } elsif ($error eq 'missingbubble') {
	$r->print("<p>".&mt("There have been <b>no</b> bubbles scanned for some question(s)")."</p>\n");
	$r->print($message);
	$r->print("<p>".&mt("Please indicate which bubble should be used for grading.")."</p>");
	$r->print(&mt("Some questions have no scanned bubbles.")."\n");

	# The form field scantron_questions is actually a list of line numbers not
	# a list of question numbers. Therefore:
	#
	
	my $line_list = &questions_to_line_list($arg);

	$r->print('<input type="hidden" name="scantron_questions" value="'.
		  $line_list.'" />');
	foreach my $question (@{$arg}) {
	    my @linenums = &prompt_for_corrections($r,$question,$scan_config,
                                                   $scan_record, $error);
            push (@lines_to_correct,@linenums);
	}
        $r->print(&verify_bubbles_checked(@lines_to_correct));
    } else {
	$r->print("\n<ul>");
    }
    $r->print("\n</li></ul>");
}

sub verify_bubbles_checked {
    my (@ansnums) = @_;
    my $ansnumstr = join('","',@ansnums);
    my $warning = &mt("A bubble or 'No bubble' selection has not been made for one or more lines.");
    my $output = (<<ENDSCRIPT);
<script type="text/javascript">
function verify_bubble_radio(form) {
    var ansnumArray = new Array ("$ansnumstr");
    var need_bubble_count = 0;
    for (var i=0; i<ansnumArray.length; i++) {
        if (form.elements["scantron_correct_Q_"+ansnumArray[i]].length > 1) {
            var bubble_picked = 0; 
            for (var j=0; j<form.elements["scantron_correct_Q_"+ansnumArray[i]].length; j++) {
                if (form.elements["scantron_correct_Q_"+ansnumArray[i]][j].checked == true) {
                    bubble_picked = 1;
                }
            }
            if (bubble_picked == 0) {
                need_bubble_count ++;
            }
        }
    }
    if (need_bubble_count) {
        alert("$warning");
        return;
    }
    form.submit(); 
}
</script>
ENDSCRIPT
    return $output;
}

=pod

=item  questions_to_line_list

Converts a list of questions into a string of comma separated
line numbers in the answer sheet used by the questions.  This is
used to fill in the scantron_questions form field.

  Arguments:
     questions    - Reference to an array of questions.

=cut


sub questions_to_line_list {
    my ($questions) = @_;
    my @lines;

    foreach my $item (@{$questions}) {
        my $question = $item;
        my ($first,$count,$last);
        if ($item =~ /^(\d+)\.(\d+)$/) {
            $question = $1;
            my $subquestion = $2;
            $first = $first_bubble_line{$question-1} + 1;
            my @subans = split(/,/,$subdivided_bubble_lines{$question-1});
            my $subcount = 1;
            while ($subcount<$subquestion) {
                $first += $subans[$subcount-1];
                $subcount ++;
            }
            $count = $subans[$subquestion-1];
        } else {
	    $first   = $first_bubble_line{$question-1} + 1;
	    $count   = $bubble_lines_per_response{$question-1};
        }
        $last = $first+$count-1;
        push(@lines, ($first..$last));
    }
    return join(',', @lines);
}

=pod 

=item prompt_for_corrections

Prompts for a potentially multiline correction to the
user's bubbling (factors out common code from scantron_get_correction
for multi and missing bubble cases).

 Arguments:
   $r           - Apache request object.
   $question    - The question number to prompt for.
   $scan_config - The scantron file configuration hash.
   $scan_record - Reference to the hash that has the the parsed scanlines.
   $error       - Type of error

 Implicit inputs:
   %bubble_lines_per_response   - Starting line numbers for each question.
                                  Numbered from 0 (but question numbers are from
                                  1.
   %first_bubble_line           - Starting bubble line for each question.
   %subdivided_bubble_lines     - optionresponse, matchresponse and rankresponse 
                                  type problems render as separate sub-questions, 
                                  in exam mode. This hash contains a 
                                  comma-separated list of the lines per 
                                  sub-question.
   %responsetype_per_response   - essayresponse, formularesponse,
                                  stringresponse, imageresponse, reactionresponse,
                                  and organicresponse type problem parts can have
                                  multiple lines per response if the weight
                                  assigned exceeds 10.  In this case, only
                                  one bubble per line is permitted, but more 
                                  than one line might contain bubbles, e.g.
                                  bubbling of: line 1 - J, line 2 - J, 
                                  line 3 - B would assign 22 points.  

=cut

sub prompt_for_corrections {
    my ($r, $question, $scan_config, $scan_record, $error) = @_;
    my ($current_line,$lines);
    my @linenums;
    my $questionnum = $question;
    if ($question =~ /^(\d+)\.(\d+)$/) {
        $question = $1;
        $current_line = $first_bubble_line{$question-1} + 1 ;
        my $subquestion = $2;
        my @subans = split(/,/,$subdivided_bubble_lines{$question-1});
        my $subcount = 1;
        while ($subcount<$subquestion) {
            $current_line += $subans[$subcount-1];
            $subcount ++;
        }
        $lines = $subans[$subquestion-1];
    } else {
        $current_line = $first_bubble_line{$question-1} + 1 ;
        $lines        = $bubble_lines_per_response{$question-1};
    }
    if ($lines > 1) {
        $r->print(&mt('The group of bubble lines below responds to a single question.').'<br />');
        if (($responsetype_per_response{$question-1} eq 'essayresponse') ||
            ($responsetype_per_response{$question-1} eq 'formularesponse') ||
            ($responsetype_per_response{$question-1} eq 'stringresponse') ||
            ($responsetype_per_response{$question-1} eq 'imageresponse') ||
            ($responsetype_per_response{$question-1} eq 'reactionresponse') ||
            ($responsetype_per_response{$question-1} eq 'organicresponse')) {
            $r->print(&mt("Although this particular question type requires handgrading, the instructions for this question in the exam directed students to leave [quant,_1,line] blank on their scantron sheets.",$lines).'<br /><br />'.&mt('A non-zero score can be assigned to the student during scantron grading by selecting a bubble in at least one line.').'<br />'.&mt('The score for this question will be a sum of the numeric values for the selected bubbles from each line, where A=1 point, B=2 points etc.').'<br />'.&mt("To assign a score of zero for this question, mark all lines as 'No bubble'.").'<br /><br />');
        } else {
            $r->print(&mt("Select at most one bubble in a single line and select 'No Bubble' in all the other lines. ")."<br />");
        }
    }
    for (my $i =0; $i < $lines; $i++) {
        my $selected = $$scan_record{"scantron.$current_line.answer"};
	&scantron_bubble_selector($r,$scan_config,$current_line, 
	        		  $questionnum,$error,split('', $selected));
        push (@linenums,$current_line);
	$current_line++;
    }
    if ($lines > 1) {
	$r->print("<hr /><br />");
    }
    return @linenums;
}

=pod

=item scantron_bubble_selector
  
   Generates the html radiobuttons to correct a single bubble line
   possibly showing the existing the selected bubbles if known

 Arguments:
    $r           - Apache request object
    $scan_config - hash from &get_scantron_config()
    $line        - Number of the line being displayed.
    $questionnum - Question number (may include subquestion)
    $error       - Type of error.
    @selected    - Array of bubbles picked on this line.

=cut

sub scantron_bubble_selector {
    my ($r,$scan_config,$line,$questionnum,$error,@selected)=@_;
    my $max=$$scan_config{'Qlength'};

    my $scmode=$$scan_config{'Qon'};
    if ($scmode eq 'number' || $scmode eq 'letter') { $max=10; }	     

    my @alphabet=('A'..'Z');
    $r->print(&Apache::loncommon::start_data_table().
              &Apache::loncommon::start_data_table_row());
    $r->print('<td rowspan="2" class="LC_leftcol_header">'.$line.'</td>');
    for (my $i=0;$i<$max+1;$i++) {
	$r->print("\n".'<td align="center">');
	if ($selected[0] eq $alphabet[$i]) { $r->print('X'); shift(@selected) }
	else { $r->print('&nbsp;'); }
	$r->print('</td>');
    }
    $r->print(&Apache::loncommon::end_data_table_row().
              &Apache::loncommon::start_data_table_row());
    for (my $i=0;$i<$max;$i++) {
	$r->print("\n".
		  '<td><label><input type="radio" name="scantron_correct_Q_'.
		  $line.'" value="'.$i.'" />'.$alphabet[$i]."</label></td>");
    }
    my $nobub_checked = ' ';
    if ($error eq 'missingbubble') {
        $nobub_checked = ' checked = "checked" ';
    }
    $r->print("\n".'<td><label><input type="radio" name="scantron_correct_Q_'.
	      $line.'" value="none"'.$nobub_checked.'/>'.&mt('No bubble').
              '</label>'."\n".'<input type="hidden" name="scantron_questionnum_Q_'.
              $line.'" value="'.$questionnum.'" /></td>');
    $r->print(&Apache::loncommon::end_data_table_row().
              &Apache::loncommon::end_data_table());
}

=pod

=item num_matches

   Counts the number of characters that are the same between the two arguments.

 Arguments:
   $orig - CODE from the scanline
   $code - CODE to match against

 Returns:
   $count - integer count of the number of same characters between the
            two arguments

=cut

sub num_matches {
    my ($orig,$code) = @_;
    my @code=split(//,$code);
    my @orig=split(//,$orig);
    my $same=0;
    for (my $i=0;$i<scalar(@code);$i++) {
	if ($code[$i] eq $orig[$i]) { $same++; }
    }
    return $same;
}

=pod

=item scantron_get_closely_matching_CODEs

   Cycles through all CODEs and finds the set that has the greatest
   number of same characters as the provided CODE

 Arguments:
   $allcodes - hash ref returned by &get_codes()
   $CODE     - CODE from the current scanline

 Returns:
   2 element list
    - first elements is number of how closely matching the best fit is 
      (5 means best set has 5 matching characters)
    - second element is an arrary ref containing the set of valid CODEs
      that best fit the passed in CODE

=cut

sub scantron_get_closely_matching_CODEs {
    my ($allcodes,$CODE)=@_;
    my @CODEs;
    foreach my $testcode (sort(keys(%{$allcodes}))) {
	push(@{$CODEs[&num_matches($CODE,$testcode)]},$testcode);
    }

    return ($#CODEs,$CODEs[-1]);
}

=pod

=item get_codes

   Builds a hash which has keys of all of the valid CODEs from the selected
   set of remembered CODEs.

 Arguments:
  $old_name - name of the set of remembered CODEs
  $cdom     - domain of the course
  $cnum     - internal course name

 Returns:
  %allcodes - keys are the valid CODEs, values are all 1

=cut

sub get_codes {
    my ($old_name, $cdom, $cnum) = @_;
    if (!$old_name) {
	$old_name=$env{'form.scantron_CODElist'};
    }
    if (!$cdom) {
	$cdom =$env{'course.'.$env{'request.course.id'}.'.domain'};
    }
    if (!$cnum) {
	$cnum =$env{'course.'.$env{'request.course.id'}.'.num'};
    }
    my %result=&Apache::lonnet::get('CODEs',[$old_name,"type\0$old_name"],
				    $cdom,$cnum);
    my %allcodes;
    if ($result{"type\0$old_name"} eq 'number') {
	%allcodes=map {($_,1)} split(',',$result{$old_name});
    } else {
	%allcodes=map {(&Apache::lonprintout::num_to_letters($_),1)} split(',',$result{$old_name});
    }
    return %allcodes;
}

=pod

=item scantron_validate_CODE

   Validates all scanlines in the selected file to not have any
   invalid or underspecified CODEs and that none of the codes are
   duplicated if this was requested.

=cut

sub scantron_validate_CODE {
    my ($r,$currentphase) = @_;
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    if ($scantron_config{'CODElocation'} &&
	$scantron_config{'CODEstart'} &&
	$scantron_config{'CODElength'}) {
	if (!defined($env{'form.scantron_CODElist'})) {
	    &FIXME_blow_up()
	}
    } else {
	return (0,$currentphase+1);
    }
    
    my %usedCODEs;

    my %allcodes=&get_codes();

    &scantron_get_maxbubble();	# parse needs the lines per response array.

    my ($scanlines,$scan_data)=&scantron_getfile();
    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	my $line=&scantron_get_line($scanlines,$scan_data,$i);
	if ($line=~/^[\s\cz]*$/) { next; }
	my $scan_record=&scantron_parse_scanline($line,$i,\%scantron_config,
						 $scan_data);
	my $CODE=$$scan_record{'scantron.CODE'};
	my $error=0;
	if (!&Apache::lonnet::validCODE($CODE)) {
	    &scantron_get_correction($r,$i,$scan_record,
				     \%scantron_config,
				     $line,'incorrectCODE',\%allcodes);
	    return(1,$currentphase);
	}
	if (%allcodes && !exists($allcodes{$CODE}) 
	    && !$$scan_record{'scantron.useCODE'}) {
	    &scantron_get_correction($r,$i,$scan_record,
				     \%scantron_config,
				     $line,'incorrectCODE',\%allcodes);
	    return(1,$currentphase);
	}
	if (exists($usedCODEs{$CODE}) 
	    && $env{'form.scantron_CODEunique'} eq 'yes'
	    && !$$scan_record{'scantron.CODE_ignore_dup'}) {
	    &scantron_get_correction($r,$i,$scan_record,
				     \%scantron_config,
				     $line,'duplicateCODE',$usedCODEs{$CODE});
	    return(1,$currentphase);
	}
	push (@{$usedCODEs{$CODE}},$$scan_record{'scantron.PaperID'});
    }
    return (0,$currentphase+1);
}

=pod

=item scantron_validate_doublebubble

   Validates all scanlines in the selected file to not have any
   bubble lines with multiple bubbles marked.

=cut

sub scantron_validate_doublebubble {
    my ($r,$currentphase) = @_;
    #get student info
    my $classlist=&Apache::loncoursedata::get_classlist();
    my %idmap=&username_to_idmap($classlist);

    #get scantron line setup
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my ($scanlines,$scan_data)=&scantron_getfile();
    &scantron_get_maxbubble();	# parse needs the bubble line array.

    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	my $line=&scantron_get_line($scanlines,$scan_data,$i);
	if ($line=~/^[\s\cz]*$/) { next; }
	my $scan_record=&scantron_parse_scanline($line,$i,\%scantron_config,
						 $scan_data);
	if (!defined($$scan_record{'scantron.doubleerror'})) { next; }
	&scantron_get_correction($r,$i,$scan_record,\%scantron_config,$line,
				 'doublebubble',
				 $$scan_record{'scantron.doubleerror'});
    	return (1,$currentphase);
    }
    return (0,$currentphase+1);
}

=pod

=item scantron_get_maxbubble

   Returns the maximum number of bubble lines that are expected to
   occur. Does this by walking the selected sequence rendering the
   resource and then checking &Apache::lonxml::get_problem_counter()
   for what the current value of the problem counter is.

   Caches the results to $env{'form.scantron_maxbubble'},
   $env{'form.scantron.bubble_lines.n'}, 
   $env{'form.scantron.first_bubble_line.n'} and
   $env{"form.scantron.sub_bubblelines.n"}
   which are the total number of bubble, lines, the number of bubble
   lines for response n and number of the first bubble line for response n,
   and a comma separated list of numbers of bubble lines for sub-questions
   (for optionresponse, matchresponse, and rankresponse items), for response n.  

=cut

sub scantron_get_maxbubble {
    if (defined($env{'form.scantron_maxbubble'}) &&
	$env{'form.scantron_maxbubble'}) {
	&restore_bubble_lines();
	return $env{'form.scantron_maxbubble'};
    }

    my (undef, undef, $sequence) =
	&Apache::lonnet::decode_symb($env{'form.selectpage'});

    my $navmap=Apache::lonnavmaps::navmap->new();
    my $map=$navmap->getResourceByUrl($sequence);
    my @resources=$navmap->retrieveResources($map,\&scantron_filter,1,0);

    &Apache::lonxml::clear_problem_counter();

    my $uname       = $env{'form.student'};
    my $udom        = $env{'form.userdom'};
    my $cid         = $env{'request.course.id'};
    my $total_lines = 0;
    %bubble_lines_per_response = ();
    %first_bubble_line         = ();
    %subdivided_bubble_lines   = ();
    %responsetype_per_response = ();
  
    my $response_number = 0;
    my $bubble_line     = 0;
    foreach my $resource (@resources) {
        my $symb = $resource->symb();
        # Need to retrieve part IDs and response IDs because essayresponse,
        # reactionresponse and organicresponse items are not included in 
        # $analysis{'parts'} from lonnet::ssi.  
        my %possible_part_ids; 
        if (ref($resource->parts()) eq 'ARRAY') { 
            foreach my $part (@{$resource->parts()}) {
                if (!&Apache::loncommon::check_if_partid_hidden($part,$symb,$udom,$uname)) {
                    my @resp_ids = $resource->responseIds($part);
                    foreach my $id (@resp_ids) {
                        $possible_part_ids{$part.'.'.$id} = 1;
                    }
                }
            }
        }
	my $result=&ssi_with_retries($resource->src(), $ssi_retries,
					('symb' => $symb,
					 'grade_target' => 'analyze',
					 'grade_courseid' => $cid,
					 'grade_domain' => $udom,
					 'grade_username' => $uname));
	my (undef, $an) =
	    split(/_HASH_REF__/,$result, 2);

        my @parts;

	my %analysis = &Apache::lonnet::str2hash($an);

        if (ref($analysis{'parts'}) eq 'ARRAY') {
            foreach my $part (@{$analysis{'parts'}}) {
                my ($id,$respid) = split(/\./,$part);
                if (!&Apache::loncommon::check_if_partid_hidden($id,$symb,$udom,$uname)) {
                    push(@parts,$part);
                }
            }
        }
        # Add part_ids for any essayresponse items. 
        foreach my $part_id (keys(%possible_part_ids)) {
            if (($analysis{$part_id.'.type'} eq 'essayresponse') ||
                ($analysis{$part_id.'.type'} eq 'reactionresponse') ||
                ($analysis{$part_id.'.type'} eq 'organicresponse')) {
                if (!grep(/^\Q$part_id\E$/,@parts)) {
                    push (@parts,$part_id);
                }
            }
        }

	foreach my $part_id (@parts) {
            my $lines = $analysis{"$part_id.bubble_lines"};

	    # TODO - make this a persistent hash not an array.

            # optionresponse, matchresponse and rankresponse type items 
            # render as separate sub-questions in exam mode.
            if (($analysis{$part_id.'.type'} eq 'optionresponse') ||
                ($analysis{$part_id.'.type'} eq 'matchresponse') ||
                ($analysis{$part_id.'.type'} eq 'rankresponse')) {
                my ($numbub,$numshown);
                if ($analysis{$part_id.'.type'} eq 'optionresponse') {
                    if (ref($analysis{$part_id.'.options'}) eq 'ARRAY') {
                        $numbub = scalar(@{$analysis{$part_id.'.options'}});
                    }
                } elsif ($analysis{$part_id.'.type'} eq 'matchresponse') {
                    if (ref($analysis{$part_id.'.items'}) eq 'ARRAY') {
                        $numbub = scalar(@{$analysis{$part_id.'.items'}});
                    }
                } elsif ($analysis{$part_id.'.type'} eq 'rankresponse') {
                    if (ref($analysis{$part_id.'.foils'}) eq 'ARRAY') {
                        $numbub = scalar(@{$analysis{$part_id.'.foils'}});
                    }
                }
                if (ref($analysis{$part_id.'.shown'}) eq 'ARRAY') {
                    $numshown = scalar(@{$analysis{$part_id.'.shown'}});
                }
                my $bubbles_per_line = 10;
                my $inner_bubble_lines = int($numshown/$bubbles_per_line);
                if (($numshown % $bubbles_per_line) != 0) {
                    $inner_bubble_lines++;
                }
                for (my $i=0; $i<$numshown; $i++) {
                    $subdivided_bubble_lines{$response_number} .= 
                        $inner_bubble_lines.',';
                }
                $subdivided_bubble_lines{$response_number} =~ s/,$//;
            } 

            $first_bubble_line{$response_number} = $bubble_line;
	    $bubble_lines_per_response{$response_number} = $lines;
            $responsetype_per_response{$response_number} = 
                $analysis{$part_id.'.type'};
	    $response_number++;

	    $bubble_line +=  $lines;
	    $total_lines +=  $lines;
	}

    }
    &Apache::lonnet::delenv('scantron\.');

    &save_bubble_lines();
    $env{'form.scantron_maxbubble'} =
	$total_lines;
    return $env{'form.scantron_maxbubble'};
}

=pod

=item scantron_validate_missingbubbles

   Validates all scanlines in the selected file to not have any
    answers that don't have bubbles that have not been verified
    to be bubble free.

=cut

sub scantron_validate_missingbubbles {
    my ($r,$currentphase) = @_;
    #get student info
    my $classlist=&Apache::loncoursedata::get_classlist();
    my %idmap=&username_to_idmap($classlist);

    #get scantron line setup
    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my ($scanlines,$scan_data)=&scantron_getfile();
    my $max_bubble=&scantron_get_maxbubble();
    if (!$max_bubble) { $max_bubble=2**31; }
    for (my $i=0;$i<=$scanlines->{'count'};$i++) {
	my $line=&scantron_get_line($scanlines,$scan_data,$i);
	if ($line=~/^[\s\cz]*$/) { next; }
	my $scan_record=&scantron_parse_scanline($line,$i,\%scantron_config,
						 $scan_data);
	if (!defined($$scan_record{'scantron.missingerror'})) { next; }
	my @to_correct;
	
	# Probably here's where the error is...

	foreach my $missing (@{$$scan_record{'scantron.missingerror'}}) {
            my $lastbubble;
            if ($missing =~ /^(\d+)\.(\d+)$/) {
               my $question = $1;
               my $subquestion = $2;
               if (!defined($first_bubble_line{$question -1})) { next; }
               my $first = $first_bubble_line{$question-1};
               my @subans = split(/,/,$subdivided_bubble_lines{$question-1});
               my $subcount = 1;
               while ($subcount<$subquestion) {
                   $first += $subans[$subcount-1];
                   $subcount ++;
               }
               my $count = $subans[$subquestion-1];
               $lastbubble = $first + $count;
            } else {
                if (!defined($first_bubble_line{$missing - 1})) { next; }
                $lastbubble = $first_bubble_line{$missing - 1} + $bubble_lines_per_response{$missing - 1};
            }
            if ($lastbubble > $max_bubble) { next; }
	    push(@to_correct,$missing);
	}
	if (@to_correct) {
	    &scantron_get_correction($r,$i,$scan_record,\%scantron_config,
				     $line,'missingbubble',\@to_correct);
	    return (1,$currentphase);
	}

    }
    return (0,$currentphase+1);
}

=pod

=item scantron_process_students

   Routine that does the actual grading of the bubble sheet information.

   The parsed scanline hash is added to %env 

   Then foreach unskipped scanline it does an &Apache::lonnet::ssi()
   foreach resource , with the form data of

	'submitted'     =>'scantron' 
	'grade_target'  =>'grade',
	'grade_username'=> username of student
	'grade_domain'  => domain of student
	'grade_courseid'=> of course
	'grade_symb'    => symb of resource to grade

    This triggers a grading pass. The problem grading code takes care
    of converting the bubbled letter information (now in %env) into a
    valid submission.

=cut

sub scantron_process_students {
    my ($r) = @_;

    my (undef,undef,$sequence)=&Apache::lonnet::decode_symb($env{'form.selectpage'});
    my ($symb)=&get_symb($r);
    if (!$symb) {
	return '';
    }
    my $default_form_data=&defaultFormData($symb);

    my %scantron_config=&get_scantron_config($env{'form.scantron_format'});
    my ($scanlines,$scan_data)=&scantron_getfile();
    my $classlist=&Apache::loncoursedata::get_classlist();
    my %idmap=&username_to_idmap($classlist);
    my $navmap=Apache::lonnavmaps::navmap->new();
    my $map=$navmap->getResourceByUrl($sequence);
    my @resources=$navmap->retrieveResources($map,\&scantron_filter,1,0);
#    $r->print("geto ".scalar(@resources)."<br />");
    my $result= <<SCANTRONFORM;
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="scantronupload">
  <input type="hidden" name="command" value="scantron_configphase" />
  $default_form_data
SCANTRONFORM
    $r->print($result);

    my @delayqueue;
    my %completedstudents;
    
    my $lock=&Apache::lonnet::set_lock(&mt('Grading bubblesheet exam'));
    my $count=&get_todo_count($scanlines,$scan_data);
    my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r,'Scantron Status',
 				    'Scantron Progress',$count,
				    'inline',undef,'scantronupload');
    &Apache::lonhtmlcommon::Update_PrgWin($r,\%prog_state,
					  'Processing first student');
    my $start=&Time::HiRes::time();
    my $i=-1;
    my ($uname,$udom,$started);

    &scantron_get_maxbubble();	# Need the bubble lines array to parse.
    

    # If an ssi failed in scantron_get_maxbubble, put an error message out to
    # the user and return.

    if ($ssi_error) {
	$r->print("</form>");
	&ssi_print_error($r);
	$r->print(&show_grading_menu_form($symb));
        &Apache::lonnet::remove_lock($lock);
	return '';		# Dunno why the other returns return '' rather than just returning.
    }

    while ($i<$scanlines->{'count'}) {
 	($uname,$udom)=('','');
 	$i++;
 	my $line=&scantron_get_line($scanlines,$scan_data,$i);
 	if ($line=~/^[\s\cz]*$/) { next; }
	if ($started) {
	    &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
						     'last student');
	}
	$started=1;
 	my $scan_record=&scantron_parse_scanline($line,$i,\%scantron_config,
 						 $scan_data);
 	unless ($uname=&scantron_find_student($scan_record,$scan_data,
 					      \%idmap,$i)) {
  	    &scantron_add_delay(\@delayqueue,$line,
 				'Unable to find a student that matches',1);
 	    next;
  	}
 	if (exists $completedstudents{$uname}) {
 	    &scantron_add_delay(\@delayqueue,$line,
 				'Student '.$uname.' has multiple sheets',2);
 	    next;
 	}
  	($uname,$udom)=split(/:/,$uname);

	&Apache::lonxml::clear_problem_counter();
  	&Apache::lonnet::appenv($scan_record);

	if (&scantron_clear_skip($scanlines,$scan_data,$i)) {
	    &scantron_putfile($scanlines,$scan_data);
	}
	
	my $i=0;
	foreach my $resource (@resources) {
	    $i++;
	    my %form=('submitted'     =>'scantron',
		      'grade_target'  =>'grade',
		      'grade_username'=>$uname,
		      'grade_domain'  =>$udom,
		      'grade_courseid'=>$env{'request.course.id'},
		      'grade_symb'    =>$resource->symb());
	    if (exists($scan_record->{'scantron.CODE'})
		&& 
		&Apache::lonnet::validCODE($scan_record->{'scantron.CODE'})) {
		$form{'CODE'}=$scan_record->{'scantron.CODE'};
	    } else {
		$form{'CODE'}='';
	    } 
	    my $result=&ssi_with_retries($resource->src(), $ssi_retries, %form);
	    if ($ssi_error) {
		$ssi_error = 0;	# So end of handler error message does not trigger.
		$r->print("</form>");
		&ssi_print_error($r);
		$r->print(&show_grading_menu_form($symb));
                &Apache::lonnet::remove_lock($lock);
		return '';	# Why return ''?  Beats me.
	    }

	    if (&Apache::loncommon::connection_aborted($r)) { last; }
	}
	$completedstudents{$uname}={'line'=>$line};
	if (&Apache::loncommon::connection_aborted($r)) { last; }
    } continue {
	&Apache::lonxml::clear_problem_counter();
	&Apache::lonnet::delenv('scantron\.');
    }
    &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
    &Apache::lonnet::remove_lock($lock);
#    my $lasttime = &Time::HiRes::time()-$start;
#    $r->print("<p>took $lasttime</p>");

    $r->print("</form>");
    $r->print(&show_grading_menu_form($symb));
    return '';
}

=pod

=item scantron_upload_scantron_data

    Creates the screen for adding a new bubble sheet data file to a course.

=cut

sub scantron_upload_scantron_data {
    my ($r)=@_;
    $r->print(&Apache::loncommon::coursebrowser_javascript($env{'request.role.domain'}));
    my $select_link=&Apache::loncommon::selectcourse_link('rules','courseid',
							  'domainid',
							  'coursename');
    my $domsel=&Apache::loncommon::select_dom_form($env{'request.role.domain'},
						   'domainid');
    my $default_form_data=&defaultFormData(&get_symb($r,1));
    $r->print('
<script type="text/javascript" language="javascript">
    function checkUpload(formname) {
	if (formname.upfile.value == "") {
	    alert("Please use the browse button to select a file from your local directory.");
	    return false;
	}
	formname.submit();
    }
</script>

<form enctype="multipart/form-data" action="/adm/grades" name="rules" method="post">
'.$default_form_data.'
<table>
<tr><td>'.$select_link.'                             </td></tr>
<tr><td>'.&mt('Course ID:').'     </td>
    <td><input name="courseid"   type="text" />      </td></tr>
<tr><td>'.&mt('Course Name:').'   </td>
    <td><input name="coursename" type="text" />      </td></tr>
<tr><td>'.&mt('Domain:').'        </td>
    <td>'.$domsel.'                                  </td></tr>
<tr><td>'.&mt('File to upload:').'</td>
    <td><input type="file" name="upfile" size="50" /></td></tr>
</table>
<input name="command" value="scantronupload_save" type="hidden" />
<input type="button" onClick="javascript:checkUpload(this.form);" value="'.&mt('Upload Scantron Data').'" />
</form>
');
    return '';
}

=pod

=item scantron_upload_scantron_data_save

   Adds a provided bubble information data file to the course if user
   has the correct privileges to do so.  

=cut

sub scantron_upload_scantron_data_save {
    my($r)=@_;
    my ($symb)=&get_symb($r,1);
    my $doanotherupload=
	'<br /><form action="/adm/grades" method="post">'."\n".
	'<input type="hidden" name="command" value="scantronupload" />'."\n".
	'<input type="submit" name="submit" value="'.&mt('Do Another Upload').'" />'."\n".
	'</form>'."\n";
    if (!&Apache::lonnet::allowed('usc',$env{'form.domainid'}) &&
	!&Apache::lonnet::allowed('usc',
			    $env{'form.domainid'}.'_'.$env{'form.courseid'})) {
	$r->print(&mt("You are not allowed to upload Scantron data to the requested course.")."<br />");
	if ($symb) {
	    $r->print(&show_grading_menu_form($symb));
	} else {
	    $r->print($doanotherupload);
	}
	return '';
    }
    my %coursedata=&Apache::lonnet::coursedescription($env{'form.domainid'}.'_'.$env{'form.courseid'});
    $r->print(&mt("Doing upload to [_1]",$coursedata{'description'})." <br />");
    my $fname=$env{'form.upfile.filename'};
    #FIXME
    #copied from lonnet::userfileupload()
    #make that function able to target a specified course
    # Replace Windows backslashes by forward slashes
    $fname=~s/\\/\//g;
    # Get rid of everything but the actual filename
    $fname=~s/^.*\/([^\/]+)$/$1/;
    # Replace spaces by underscores
    $fname=~s/\s+/\_/g;
    # Replace all other weird characters by nothing
    $fname=~s/[^\w\.\-]//g;
    # See if there is anything left
    unless ($fname) { return 'error: no uploaded file'; }
    my $uploadedfile=$fname;
    $fname='scantron_orig_'.$fname;
    if (length($env{'form.upfile'}) < 2) {
	$r->print(&mt("<span class=\"LC_error\">Error:</span> The file you attempted to upload, [_1]  contained no information. Please check that you entered the correct filename.",'<span class="LC_filename">'.&HTML::Entities::encode($env{'form.upfile.filename'},'<>&"')."</span>"));
    } else {
	my $result=&Apache::lonnet::finishuserfileupload($env{'form.courseid'},$env{'form.domainid'},'upfile',$fname);
	if ($result =~ m|^/uploaded/|) {
	    $r->print(&mt("<span class=\"LC_success\">Success:</span> Successfully uploaded [_1] bytes of data into location [_2]",
			  (length($env{'form.upfile'})-1),
			  '<span class="LC_filename">'.$result."</span>"));
	} else {
	    $r->print(&mt("<span class=\"LC_error\">Error:</span> An error ([_1]) occurred when attempting to upload the file, [_2]",
			  $result,
			  '<span class="LC_filename">'.&HTML::Entities::encode($env{'form.upfile.filename'},'<>&"')."</span>"));

	}
    }
    if ($symb) {
	$r->print(&scantron_selectphase($r,$uploadedfile));
    } else {
	$r->print($doanotherupload);
    }
    return '';
}

=pod

=item valid_file

   Validates that the requested bubble data file exists in the course.

=cut

sub valid_file {
    my ($requested_file)=@_;
    foreach my $filename (sort(&scantron_filenames())) {
	if ($requested_file eq $filename) { return 1; }
    }
    return 0;
}

=pod

=item scantron_download_scantron_data

   Shows a list of the three internal files (original, corrected,
   skipped) for a specific bubble sheet data file that exists in the
   course.

=cut

sub scantron_download_scantron_data {
    my ($r)=@_;
    my $default_form_data=&defaultFormData(&get_symb($r,1));
    my $cname=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my $file=$env{'form.scantron_selectfile'};
    if (! &valid_file($file)) {
	$r->print('
	<p>
	    '.&mt('The requested file name was invalid.').'
        </p>
');
	$r->print(&show_grading_menu_form(&get_symb($r,1)));
	return;
    }
    my $orig='/uploaded/'.$cdom.'/'.$cname.'/scantron_orig_'.$file;
    my $corrected='/uploaded/'.$cdom.'/'.$cname.'/scantron_corrected_'.$file;
    my $skipped='/uploaded/'.$cdom.'/'.$cname.'/scantron_skipped_'.$file;
    &Apache::lonnet::allowuploaded('/adm/grades',$orig);
    &Apache::lonnet::allowuploaded('/adm/grades',$corrected);
    &Apache::lonnet::allowuploaded('/adm/grades',$skipped);
    $r->print('
    <p>
	'.&mt('[_1]Original[_2] file as uploaded by the scantron office.',
	      '<a href="'.$orig.'">','</a>').'
    </p>
    <p>
	'.&mt('[_1]Corrections[_2], a file of corrected records that were used in grading.',
	      '<a href="'.$corrected.'">','</a>').'
    </p>
    <p>
	'.&mt('[_1]Skipped[_2], a file of records that were skipped.',
	      '<a href="'.$skipped.'">','</a>').'
    </p>
');
    $r->print(&show_grading_menu_form(&get_symb($r,1)));
    return '';
}

=pod

=back

=cut

#-------- end of section for handling grading scantron forms -------
#
#-------------------------------------------------------------------

#-------------------------- Menu interface -------------------------
#
#--- Show a Grading Menu button - Calls the next routine ---
sub show_grading_menu_form {
    my ($symb)=@_;
    my $result.='<br /><form action="/adm/grades" method="post">'."\n".
	'<input type="hidden" name="symb" value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="saveState"  value="'.$env{'form.saveState'}.'" />'."\n".
	'<input type="hidden" name="command" value="gradingmenu" />'."\n".
	'<input type="submit" name="submit" value="'.&mt('Grading Menu').'" />'."\n".
	'</form>'."\n";
    return $result;
}

# -- Retrieve choices for grading form
sub savedState {
    my %savedState = ();
    if ($env{'form.saveState'}) {
	foreach (split(/:/,$env{'form.saveState'})) {
	    my ($key,$value) = split(/=/,$_,2);
	    $savedState{$key} = $value;
	}
    }
    return \%savedState;
}

sub grading_menu {
    my ($request) = @_;
    my ($symb)=&get_symb($request);
    if (!$symb) {return '';}
    my $probTitle = &Apache::lonnet::gettitle($symb);
    my ($table,undef,$hdgrade) = &showResourceInfo($symb,$probTitle);

    $request->print($table);
    my %fields = ('symb'=>&Apache::lonenc::check_encrypt($symb),
                  'handgrade'=>$hdgrade,
                  'probTitle'=>$probTitle,
                  'command'=>'submit_options',
                  'saveState'=>"",
                  'gradingMenu'=>1,
                  'showgrading'=>"yes");
    my $url = &Apache::lonhtmlcommon::build_url('grades/',\%fields);
    my @menu = ({ url => $url,
                     name => &mt('Manual Grading/View Submissions'),
                     short_description => 
    &mt('Start the process of hand grading submissions.'),
                 });
    $fields{'command'} = 'csvform';
    $url = &Apache::lonhtmlcommon::build_url('grades/',\%fields);
    push (@menu, { url => $url,
                   name => &mt('Upload Scores'),
                   short_description => 
            &mt('Specify a file containing the class scores for current resource.')});
    $fields{'command'} = 'processclicker';
    $url = &Apache::lonhtmlcommon::build_url('grades/',\%fields);
    push (@menu, { url => $url,
                   name => &mt('Process Clicker'),
                   short_description => 
            &mt('Specify a file containing the clicker information for this resource.')});
    $fields{'command'} = 'scantron_selectphase';
    $url = &Apache::lonhtmlcommon::build_url('grades/',\%fields);
    push (@menu, { url => $url,
                   name => &mt('Grade/Manage Scantron Forms'),
                   short_description => 
            &mt('')});
    $fields{'command'} = 'verify';
    $url = &Apache::lonhtmlcommon::build_url('grades/',\%fields);
    push (@menu, { url => "",
                   name => &mt('Verify Receipt'),
                   short_description => 
            &mt('')});
    #
    # Create the menu
    my $Str;
    # $Str .= '<h2>'.&mt('Please select a grading task').'</h2>';
    $Str .= '<form method="post" action="" name="gradingMenu">';
    $Str .= '<input type="hidden" name="command" value="" />'.
    	'<input type="hidden" name="symb"        value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="handgrade"   value="'.$hdgrade.'" />'."\n".
	'<input type="hidden" name="probTitle"   value="'.$probTitle.'" />'."\n".
	'<input type="hidden" name="saveState"   value="" />'."\n".
	'<input type="hidden" name="gradingMenu" value="1" />'."\n".
	'<input type="hidden" name="showgrading" value="yes" />'."\n";

    foreach my $menudata (@menu) {
        if ($menudata->{'name'} ne &mt('Verify Receipt')) {
            $Str .='    <h3><a '.
                $menudata->{'jscript'}.
                ' href="'.
                $menudata->{'url'}.'" >'.
                $menudata->{'name'}."</a></h3>\n";
        } else {
            $Str .='<hr /><input type="button" value="'.&mt('Verify Receipt').'" '.
                $menudata->{'jscript'}.
                ' onClick="javascript:checkChoice(document.forms.gradingMenu,\'5\',\'verify\')" '.
                ' /> '.
		&Apache::lonnet::recprefix($env{'request.course.id'}).
                    '-<input type="text" name="receipt" size="4" onChange="javascript:checkReceiptNo(this.form,\'OK\')" />';
        }
        $Str .= '    '.('&nbsp;'x8).$menudata->{'short_description'}.
            "\n";
    }
    $Str .="</form>\n";
    $request->print(<<GRADINGMENUJS);
<script type="text/javascript" language="javascript">
    function checkChoice(formname,val,cmdx) {
	if (val <= 2) {
	    var cmd = radioSelection(formname.radioChoice);
	    var cmdsave = cmd;
	} else {
	    cmd = cmdx;
	    cmdsave = 'submission';
	}
	formname.command.value = cmd;
	if (val < 5) formname.submit();
	if (val == 5) {
	    if (!checkReceiptNo(formname,'notOK')) { 
	        return false;
	    } else {
	        formname.submit();
	    }
	}
    }

    function checkReceiptNo(formname,nospace) {
	var receiptNo = formname.receipt.value;
	var checkOpt = false;
	if (nospace == "OK" && isNaN(receiptNo)) {checkOpt = true;}
	if (nospace == "notOK" && (isNaN(receiptNo) || receiptNo == "")) {checkOpt = true;}
	if (checkOpt) {
	    alert("Please enter a receipt number given by a student in the receipt box.");
	    formname.receipt.value = "";
	    formname.receipt.focus();
	    return false;
	}
	return true;
    }
</script>
GRADINGMENUJS
    &commonJSfunctions($request);
    return $Str;    
}


#--- Displays the submissions first page -------
sub submit_options {
    my ($request) = @_;
    my ($symb)=&get_symb($request);
    if (!$symb) {return '';}
    my $probTitle = &Apache::lonnet::gettitle($symb);

    $request->print(<<GRADINGMENUJS);
<script type="text/javascript" language="javascript">
    function checkChoice(formname,val,cmdx) {
	if (val <= 2) {
	    var cmd = radioSelection(formname.radioChoice);
	    var cmdsave = cmd;
	} else {
	    cmd = cmdx;
	    cmdsave = 'submission';
	}
	formname.command.value = cmd;
	formname.saveState.value = "saveCmd="+cmdsave+":saveSec="+pullDownSelection(formname.section)+
	    ":saveSub="+pullDownSelection(formname.submitonly)+":saveStatus="+pullDownSelection(formname.Status);
	if (val < 5) formname.submit();
	if (val == 5) {
	    if (!checkReceiptNo(formname,'notOK')) { return false;}
	    formname.submit();
	}
	if (val < 7) formname.submit();
    }

    function checkReceiptNo(formname,nospace) {
	var receiptNo = formname.receipt.value;
	var checkOpt = false;
	if (nospace == "OK" && isNaN(receiptNo)) {checkOpt = true;}
	if (nospace == "notOK" && (isNaN(receiptNo) || receiptNo == "")) {checkOpt = true;}
	if (checkOpt) {
	    alert("Please enter a receipt number given by a student in the receipt box.");
	    formname.receipt.value = "";
	    formname.receipt.focus();
	    return false;
	}
	return true;
    }
</script>
GRADINGMENUJS
    &commonJSfunctions($request);
    my ($table,undef,$hdgrade) = &showResourceInfo($symb,$probTitle);
    my $result;
    my (undef,$sections) = &getclasslist('all','0');
    my $savedState = &savedState();
    my $saveCmd = ($$savedState{'saveCmd'} eq '' ? 'submission' : $$savedState{'saveCmd'});
    my $saveSec = ($$savedState{'saveSec'} eq '' ? 'all' : $$savedState{'saveSec'});
    my $saveSub = ($$savedState{'saveSub'} eq '' ? 'all' : $$savedState{'saveSub'});
    my $saveStatus = ($$savedState{'saveStatus'} eq '' ? 'Active' : $$savedState{'saveStatus'});

    $result.='<form action="/adm/grades" method="post" name="gradingMenu">'."\n".
	'<input type="hidden" name="symb"        value="'.&Apache::lonenc::check_encrypt($symb).'" />'."\n".
	'<input type="hidden" name="handgrade"   value="'.$hdgrade.'" />'."\n".
	'<input type="hidden" name="probTitle"   value="'.$probTitle.'" />'."\n".
	'<input type="hidden" name="command"     value="" />'."\n".
	'<input type="hidden" name="saveState"   value="" />'."\n".
	'<input type="hidden" name="gradingMenu" value="1" />'."\n".
	'<input type="hidden" name="showgrading" value="yes" />'."\n";

    $result.='
    <div class="LC_grade_select_mode">
      <div class="LC_grade_select_mode_current">
        <h2>
          '.&mt('Grade Current Resource').'
        </h2>
        <div class="LC_grade_select_mode_body">
          <div class="LC_grades_resource_info">
           '.$table.'
          </div>
          <div class="LC_grade_select_mode_selector">
             <div class="LC_grade_select_mode_selector_header">
                '.&mt('Sections').'
             </div>
             <div class="LC_grade_select_mode_selector_body">
	       <select name="section" multiple="multiple" size="5">'."\n";
    if (ref($sections)) {
	foreach my $section (sort (@$sections)) {
	    $result.='<option value="'.$section.'" '.
		($saveSec eq $section ? 'selected="selected"':'').'>'.$section.'</option>'."\n";
	}
    }
    $result.= '<option value="all" '.($saveSec eq 'all' ? 'selected="selected"' : ''). '>all</option></select> &nbsp; ';
    $result.='
             </div>
          </div>
          <div class="LC_grade_select_mode_selector">
             <div class="LC_grade_select_mode_selector_header">
                '.&mt('Groups').'
             </div>
             <div class="LC_grade_select_mode_selector_body">
                '.&Apache::lonstatistics::GroupSelect('group','multiple',5).'
             </div>
          </div>
          <div class="LC_grade_select_mode_selector">
             <div class="LC_grade_select_mode_selector_header">
                '.&mt('Access Status').'
             </div>
             <div class="LC_grade_select_mode_selector_body">
                '.&Apache::lonhtmlcommon::StatusOptions($saveStatus,undef,5,undef,'mult').'
             </div>
          </div>
          <div class="LC_grade_select_mode_selector">
             <div class="LC_grade_select_mode_selector_header">
                '.&mt('Submission Status').'
             </div>
             <div class="LC_grade_select_mode_selector_body">
               <select name="submitonly" size="5">
	         <option value="yes" '.      ($saveSub eq 'yes'       ? 'selected="selected"' : '').'>'.&mt('with submissions').'</option>
	         <option value="queued" '.   ($saveSub eq 'queued'    ? 'selected="selected"' : '').'>'.&mt('in grading queue').'</option>
	         <option value="graded" '.   ($saveSub eq 'graded'    ? 'selected="selected"' : '').'>'.&mt('with ungraded submissions').'</option>
	         <option value="incorrect" '.($saveSub eq 'incorrect' ? 'selected="selected"' : '').'>'.&mt('with incorrect submissions').'</option>
                 <option value="all" '.      ($saveSub eq 'all'       ? 'selected="selected"' : '').'>'.&mt('with any status').'</option>
               </select>
             </div>
          </div>
          <div class="LC_grade_select_mode_type_body">
            <div class="LC_grade_select_mode_type">
              <label>
                <input type="radio" name="radioChoice" value="submission" '.
                  ($saveCmd eq 'submission' ? 'checked="checked"' : '').' /> '.
             &mt('Select individual students to grade and view submissions.').'
	      </label> 
            </div>
            <div class="LC_grade_select_mode_type">
	      <label>
                <input type="radio" name="radioChoice" value="viewgrades" '.
                  ($saveCmd eq 'viewgrades' ? 'checked="checked"' : '').' /> '.
                    &mt('Grade all selected students in a grading table.').'
              </label>
            </div>
            <div class="LC_grade_select_mode_type">
	      <input type="button" onClick="javascript:checkChoice(this.form,\'2\');" value="'.&mt('Next-&gt;').'" />
            </div>
          </div>
        </div>
      </div>
      <div class="LC_grade_select_mode_page">
        <h2>
         '.&mt('Grade Complete Folder for One Student').'
        </h2>
        <div class="LC_grades_select_mode_body">
          <div class="LC_grade_select_mode_type_body">
            <div class="LC_grade_select_mode_type">
              <label>
                <input type="radio" name="radioChoice" value="pickStudentPage" '.
	  ($saveCmd eq 'pickStudentPage' ? 'checked="checked"' : '').' /> '.
  &mt('The <b>complete</b> page/sequence/folder: For one student').'
              </label>
            </div>
            <div class="LC_grade_select_mode_type">
	      <input type="button" onClick="javascript:checkChoice(this.form,\'2\');" value="'.&mt('Next-&gt;').'" />
            </div>
          </div>
        </div>
      </div>
    </div>
  </form>';
    $result .= &show_grading_menu_form($symb);
    return $result;
}

sub reset_perm {
    undef(%perm);
}

sub init_perm {
    &reset_perm();
    foreach my $test_perm ('vgr','mgr','opa') {

	my $scope = $env{'request.course.id'};
	if (!($perm{$test_perm}=&Apache::lonnet::allowed($test_perm,$scope))) {

	    $scope .= '/'.$env{'request.course.sec'};
	    if ( $perm{$test_perm}=
		 &Apache::lonnet::allowed($test_perm,$scope)) {
		$perm{$test_perm.'_section'}=$env{'request.course.sec'};
	    } else {
		delete($perm{$test_perm});
	    }
	}
    }
}

sub gather_clicker_ids {
    my %clicker_ids;

    my $classlist = &Apache::loncoursedata::get_classlist();

    # Set up a couple variables.
    my $username_idx = &Apache::loncoursedata::CL_SNAME();
    my $domain_idx   = &Apache::loncoursedata::CL_SDOM();
    my $status_idx   = &Apache::loncoursedata::CL_STATUS();

    foreach my $student (keys(%$classlist)) {
        if ($classlist->{$student}->[$status_idx] ne 'Active') { next; }
        my $username = $classlist->{$student}->[$username_idx];
        my $domain   = $classlist->{$student}->[$domain_idx];
        my $clickers =
	    (&Apache::lonnet::userenvironment($domain,$username,'clickers'))[1];
        foreach my $id (split(/\,/,$clickers)) {
            $id=~s/^[\#0]+//;
            $id=~s/[\-\:]//g;
            if (exists($clicker_ids{$id})) {
		$clicker_ids{$id}.=','.$username.':'.$domain;
            } else {
		$clicker_ids{$id}=$username.':'.$domain;
            }
        }
    }
    return %clicker_ids;
}

sub gather_adv_clicker_ids {
    my %clicker_ids;
    my $cnum=$env{'course.'.$env{'request.course.id'}.'.num'};
    my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
    my %coursepersonnel=&Apache::lonnet::get_course_adv_roles($cdom.'/'.$cnum);
    foreach my $element (sort(keys(%coursepersonnel))) {
        foreach my $person (split(/\,/,$coursepersonnel{$element})) {
            my ($puname,$pudom)=split(/\:/,$person);
            my $clickers =
		(&Apache::lonnet::userenvironment($pudom,$puname,'clickers'))[1];
            foreach my $id (split(/\,/,$clickers)) {
		$id=~s/^[\#0]+//;
                $id=~s/[\-\:]//g;
		if (exists($clicker_ids{$id})) {
		    $clicker_ids{$id}.=','.$puname.':'.$pudom;
		} else {
		    $clicker_ids{$id}=$puname.':'.$pudom;
		}
            }
        }
    }
    return %clicker_ids;
}

sub clicker_grading_parameters {
    return ('gradingmechanism' => 'scalar',
            'upfiletype' => 'scalar',
            'specificid' => 'scalar',
            'pcorrect' => 'scalar',
            'pincorrect' => 'scalar');
}

sub process_clicker {
    my ($r)=@_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}
    my $result=&checkforfile_js();
    $env{'form.probTitle'} = &Apache::lonnet::gettitle($symb);
    my ($table) = &showResourceInfo($symb,$env{'form.probTitle'});
    $result.=$table;
    $result.='<br /><table width="100%" border="0"><tr><td bgcolor="#777777">'."\n";
    $result.='<table width="100%" border="0"><tr bgcolor="#e6ffff"><td>'."\n";
    $result.='&nbsp;<b>'.&mt('Specify a file containing the clicker information for this resource').
        '.</b></td></tr>'."\n";
    $result.='<tr bgcolor=#ffffe6><td>'."\n";
# Attempt to restore parameters from last session, set defaults if not present
    my %Saveable_Parameters=&clicker_grading_parameters();
    &Apache::loncommon::restore_course_settings('grades_clicker',
                                                 \%Saveable_Parameters);
    if (!$env{'form.pcorrect'}) { $env{'form.pcorrect'}=100; }
    if (!$env{'form.pincorrect'}) { $env{'form.pincorrect'}=100; }
    if (!$env{'form.gradingmechanism'}) { $env{'form.gradingmechanism'}='attendance'; }
    if (!$env{'form.upfiletype'}) { $env{'form.upfiletype'}='iclicker'; }

    my %checked;
    foreach my $gradingmechanism ('attendance','personnel','specific') {
       if ($env{'form.gradingmechanism'} eq $gradingmechanism) {
          $checked{$gradingmechanism}="checked='checked'";
       }
    }

    my $upload=&mt("Upload File");
    my $type=&mt("Type");
    my $attendance=&mt("Award points just for participation");
    my $personnel=&mt("Correctness determined from response by course personnel");
    my $specific=&mt("Correctness determined from response with clicker ID(s)"); 
    my $pcorrect=&mt("Percentage points for correct solution");
    my $pincorrect=&mt("Percentage points for incorrect solution");
    my $selectform=&Apache::loncommon::select_form($env{'form.upfiletype'},'upfiletype',
						   ('iclicker' => 'i>clicker',
                                                    'interwrite' => 'interwrite PRS'));
    $symb = &Apache::lonenc::check_encrypt($symb);
    $result.=<<ENDUPFORM;
<script type="text/javascript">
function sanitycheck() {
// Accept only integer percentages
   document.forms.gradesupload.pcorrect.value=Math.round(document.forms.gradesupload.pcorrect.value);
   document.forms.gradesupload.pincorrect.value=Math.round(document.forms.gradesupload.pincorrect.value);
// Find out grading choice
   for (i=0; i<document.forms.gradesupload.gradingmechanism.length; i++) {
      if (document.forms.gradesupload.gradingmechanism[i].checked) {
         gradingchoice=document.forms.gradesupload.gradingmechanism[i].value;
      }
   }
// By default, new choice equals user selection
   newgradingchoice=gradingchoice;
// Not good to give more points for false answers than correct ones
   if (Math.round(document.forms.gradesupload.pcorrect.value)<Math.round(document.forms.gradesupload.pincorrect.value)) {
      document.forms.gradesupload.pcorrect.value=document.forms.gradesupload.pincorrect.value;
   }
// If new choice is attendance only, and old choice was correctness-based, restore defaults
   if ((gradingchoice=='attendance') && (document.forms.gradesupload.waschecked.value!='attendance')) {
      document.forms.gradesupload.pcorrect.value=100;
      document.forms.gradesupload.pincorrect.value=100;
   }
// If the values are different, cannot be attendance only
   if ((Math.round(document.forms.gradesupload.pcorrect.value)!=Math.round(document.forms.gradesupload.pincorrect.value)) &&
       (gradingchoice=='attendance')) {
       newgradingchoice='personnel';
   }
// Change grading choice to new one
   for (i=0; i<document.forms.gradesupload.gradingmechanism.length; i++) {
      if (document.forms.gradesupload.gradingmechanism[i].value==newgradingchoice) {
         document.forms.gradesupload.gradingmechanism[i].checked=true;
      } else {
         document.forms.gradesupload.gradingmechanism[i].checked=false;
      }
   }
// Remember the old state
   document.forms.gradesupload.waschecked.value=newgradingchoice;
}
</script>
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<input type="hidden" name="symb" value="$symb" />
<input type="hidden" name="command" value="processclickerfile" />
<input type="hidden" name="probTitle" value="$env{'form.probTitle'}" />
<input type="hidden" name="saveState"  value="$env{'form.saveState'}" />
<input type="file" name="upfile" size="50" />
<br /><label>$type: $selectform</label>
<br /><label><input type="radio" name="gradingmechanism" value="attendance" $checked{'attendance'} onClick="sanitycheck()" />$attendance </label>
<br /><label><input type="radio" name="gradingmechanism" value="personnel" $checked{'personnel'} onClick="sanitycheck()" />$personnel</label>
<br /><label><input type="radio" name="gradingmechanism" value="specific" $checked{'specific'} onClick="sanitycheck()" />$specific </label>
<input type="text" name="specificid" value="$env{'form.specificid'}" size="20" />
<input type="hidden" name="waschecked" value="$env{'form.gradingmechanism'}" />
<br /><label>$pcorrect: <input type="text" name="pcorrect" size="4" value="$env{'form.pcorrect'}" onChange="sanitycheck()" /></label>
<br /><label>$pincorrect: <input type="text" name="pincorrect" size="4" value="$env{'form.pincorrect'}" onChange="sanitycheck()" /></label>
<br /><input type="button" onClick="javascript:checkUpload(this.form);" value="$upload" />
</form>
ENDUPFORM
    $result.='</td></tr></table>'."\n".
             '</td></tr></table><br /><br />'."\n";
    $result.=&show_grading_menu_form($symb);
    return $result;
}

sub process_clicker_file {
    my ($r)=@_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}

    my %Saveable_Parameters=&clicker_grading_parameters();
    &Apache::loncommon::store_course_settings('grades_clicker',
                                              \%Saveable_Parameters);

    my ($result) = &showResourceInfo($symb,$env{'form.probTitle'});
    if (($env{'form.gradingmechanism'} eq 'specific') && ($env{'form.specificid'}!~/\w/)) {
	$result.='<span class="LC_error">'.&mt('You need to specify a clicker ID for the correct answer').'</span>';
	return $result.&show_grading_menu_form($symb);
    }
    my %clicker_ids=&gather_clicker_ids();
    my %correct_ids;
    if ($env{'form.gradingmechanism'} eq 'personnel') {
	%correct_ids=&gather_adv_clicker_ids();
    }
    if ($env{'form.gradingmechanism'} eq 'specific') {
	foreach my $correct_id (split(/[\s\,]/,$env{'form.specificid'})) {;
	   $correct_id=~tr/a-z/A-Z/;
	   $correct_id=~s/\s//gs;
	   $correct_id=~s/^[\#0]+//;
           $correct_id=~s/[\-\:]//g;
           if ($correct_id) {
	      $correct_ids{$correct_id}='specified';
           }
        }
    }
    if ($env{'form.gradingmechanism'} eq 'attendance') {
	$result.=&mt('Score based on attendance only');
    } else {
	my $number=0;
	$result.='<p><b>'.&mt('Correctness determined by the following IDs').'</b>';
	foreach my $id (sort(keys(%correct_ids))) {
	    $result.='<br /><tt>'.$id.'</tt> - ';
	    if ($correct_ids{$id} eq 'specified') {
		$result.=&mt('specified');
	    } else {
		my ($uname,$udom)=split(/\:/,$correct_ids{$id});
		$result.=&Apache::loncommon::plainname($uname,$udom);
	    }
	    $number++;
	}
        $result.="</p>\n";
	if ($number==0) {
	    $result.='<span class="LC_error">'.&mt('No IDs found to determine correct answer').'</span>';
	    return $result.&show_grading_menu_form($symb);
	}
    }
    if (length($env{'form.upfile'}) < 2) {
        $result.=&mt('[_1] Error: [_2] The file you attempted to upload, [_3] contained no information. Please check that you entered the correct filename.',
		     '<span class="LC_error">',
		     '</span>',
		     '<span class="LC_filename">'.&HTML::Entities::encode($env{'form.upfile.filename'},'<>&"').'</span>');
        return $result.&show_grading_menu_form($symb);
    }

# Were able to get all the info needed, now analyze the file

    $result.=&Apache::loncommon::studentbrowser_javascript();
    $symb = &Apache::lonenc::check_encrypt($symb);
    my $heading=&mt('Scanning clicker file');
    $result.=(<<ENDHEADER);
<br /><table width="100%" border="0"><tr><td bgcolor="#777777">
<table width="100%" border="0"><tr bgcolor="#e6ffff"><td>
<b>$heading</b></td></tr><tr bgcolor=#ffffe6><td>
<form method="post" action="/adm/grades" name="clickeranalysis">
<input type="hidden" name="symb" value="$symb" />
<input type="hidden" name="command" value="assignclickergrades" />
<input type="hidden" name="probTitle" value="$env{'form.probTitle'}" />
<input type="hidden" name="saveState"  value="$env{'form.saveState'}" />
<input type="hidden" name="gradingmechanism" value="$env{'form.gradingmechanism'}" />
<input type="hidden" name="pcorrect" value="$env{'form.pcorrect'}" />
<input type="hidden" name="pincorrect" value="$env{'form.pincorrect'}" />
ENDHEADER
    my %responses;
    my @questiontitles;
    my $errormsg='';
    my $number=0;
    if ($env{'form.upfiletype'} eq 'iclicker') {
	($errormsg,$number)=&iclicker_eval(\@questiontitles,\%responses);
    }
    if ($env{'form.upfiletype'} eq 'interwrite') {
        ($errormsg,$number)=&interwrite_eval(\@questiontitles,\%responses);
    }
    $result.='<br />'.&mt('Found [_1] question(s)',$number).'<br />'.
             '<input type="hidden" name="number" value="'.$number.'" />'.
             &mt('Awarding [_1] percent for correct and [_2] percent for incorrect responses',
                 $env{'form.pcorrect'},$env{'form.pincorrect'}).
             '<br />';
# Remember Question Titles
# FIXME: Possibly need delimiter other than ":"
    for (my $i=0;$i<$number;$i++) {
        $result.='<input type="hidden" name="question:'.$i.'" value="'.
                 &HTML::Entities::encode($questiontitles[$i],'"&<>').'" />';
    }
    my $correct_count=0;
    my $student_count=0;
    my $unknown_count=0;
# Match answers with usernames
# FIXME: Possibly need delimiter other than ":"
    foreach my $id (keys(%responses)) {
       if ($correct_ids{$id}) {
          $result.="\n".'<input type="hidden" name="correct:'.$correct_count.':'.$correct_ids{$id}.'" value="'.$responses{$id}.'" />';
          $correct_count++;
       } elsif ($clicker_ids{$id}) {
          if ($clicker_ids{$id}=~/\,/) {
# More than one user with the same clicker!
             $result.="\n<hr />".&mt('Clicker registered more than once').": <tt>".$id."</tt><br />";
             $result.="\n".'<input type="hidden" name="unknown:'.$id.'" value="'.$responses{$id}.'" />'.
                           "<select name='multi".$id."'>";
             foreach my $reguser (sort(split(/\,/,$clicker_ids{$id}))) {
                 $result.="<option value='".$reguser."'>".&Apache::loncommon::plainname(split(/\:/,$reguser)).' ('.$reguser.')</option>';
             }
             $result.='</select>';
             $unknown_count++;
          } else {
# Good: found one and only one user with the right clicker
             $result.="\n".'<input type="hidden" name="student:'.$clicker_ids{$id}.'" value="'.$responses{$id}.'" />';
             $student_count++;
          }
       } else {
          $result.="\n<hr />".&mt('Unregistered Clicker')." <tt>".$id."</tt><br />";
          $result.="\n".'<input type="hidden" name="unknown:'.$id.'" value="'.$responses{$id}.'" />'.
                   "\n".&mt("Username").": <input type='text' name='uname".$id."' />&nbsp;".
                   "\n".&mt("Domain").": ".
                   &Apache::loncommon::select_dom_form($env{'course.'.$env{'request.course.id'}.'.domain'},'udom'.$id).'&nbsp;'.
                   &Apache::loncommon::selectstudent_link('clickeranalysis','uname'.$id,'udom'.$id);
          $unknown_count++;
       }
    }
    $result.='<hr />'.
             &mt('Found [_1] registered and [_2] unregistered clickers.',$student_count,$unknown_count);
    if ($env{'form.gradingmechanism'} ne 'attendance') {
       if ($correct_count==0) {
          $errormsg.="Found no correct answers answers for grading!";
       } elsif ($correct_count>1) {
          $result.='<br /><span class="LC_warning">'.&mt("Found [_1] entries for grading!",$correct_count).'</span>';
       }
    }
    if ($number<1) {
       $errormsg.="Found no questions.";
    }
    if ($errormsg) {
       $result.='<br /><span class="LC_error">'.&mt($errormsg).'</span>';
    } else {
       $result.='<br /><input type="submit" name="finalize" value="'.&mt('Finalize Grading').'" />';
    }
    $result.='</form></td></tr></table>'."\n".
             '</td></tr></table><br /><br />'."\n";
    return $result.&show_grading_menu_form($symb);
}

sub iclicker_eval {
    my ($questiontitles,$responses)=@_;
    my $number=0;
    my $errormsg='';
    foreach my $line (split(/[\n\r]/,$env{'form.upfile'})) {
        my %components=&Apache::loncommon::record_sep($line);
        my @entries=map {$components{$_}} (sort(keys(%components)));
	if ($entries[0] eq 'Question') {
	    for (my $i=3;$i<$#entries;$i+=6) {
		$$questiontitles[$number]=$entries[$i];
		$number++;
	    }
	}
	if ($entries[0]=~/^\#/) {
	    my $id=$entries[0];
	    my @idresponses;
	    $id=~s/^[\#0]+//;
	    for (my $i=0;$i<$number;$i++) {
		my $idx=3+$i*6;
		push(@idresponses,$entries[$idx]);
	    }
	    $$responses{$id}=join(',',@idresponses);
	}
    }
    return ($errormsg,$number);
}

sub interwrite_eval {
    my ($questiontitles,$responses)=@_;
    my $number=0;
    my $errormsg='';
    my $skipline=1;
    my $questionnumber=0;
    my %idresponses=();
    foreach my $line (split(/[\n\r]/,$env{'form.upfile'})) {
        my %components=&Apache::loncommon::record_sep($line);
        my @entries=map {$components{$_}} (sort(keys(%components)));
        if ($entries[1] eq 'Time') { $skipline=0; next; }
        if ($entries[1] eq 'Response') { $skipline=1; }
        next if $skipline;
        if ($entries[0]!=$questionnumber) {
           $questionnumber=$entries[0];
           $$questiontitles[$number]=&mt('Question [_1]',$questionnumber);
           $number++;
        }
        my $id=$entries[4];
        $id=~s/^[\#0]+//;
        $id=~s/^v\d*\://i;
        $id=~s/[\-\:]//g;
        $idresponses{$id}[$number]=$entries[6];
    }
    foreach my $id (keys %idresponses) {
       $$responses{$id}=join(',',@{$idresponses{$id}});
       $$responses{$id}=~s/^\s*\,//;
    }
    return ($errormsg,$number);
}

sub assign_clicker_grades {
    my ($r)=@_;
    my ($symb)=&get_symb($r);
    if (!$symb) {return '';}
# See which part we are saving to
    my ($partlist,$handgrade,$responseType) = &response_type($symb);
# FIXME: This should probably look for the first handgradeable part
    my $part=$$partlist[0];
# Start screen output
    my ($result) = &showResourceInfo($symb,$env{'form.probTitle'});

    my $heading=&mt('Assigning grades based on clicker file');
    $result.=(<<ENDHEADER);
<br /><table width="100%" border="0"><tr><td bgcolor="#777777">
<table width="100%" border="0"><tr bgcolor="#e6ffff"><td>
<b>$heading</b></td></tr><tr bgcolor=#ffffe6><td>
ENDHEADER
# Get correct result
# FIXME: Possibly need delimiter other than ":"
    my @correct=();
    my $gradingmechanism=$env{'form.gradingmechanism'};
    my $number=$env{'form.number'};
    if ($gradingmechanism ne 'attendance') {
       foreach my $key (keys(%env)) {
          if ($key=~/^form\.correct\:/) {
             my @input=split(/\,/,$env{$key});
             for (my $i=0;$i<=$#input;$i++) {
                 if (($correct[$i]) && ($input[$i]) &&
                     ($correct[$i] ne $input[$i])) {
                    $result.='<br /><span class="LC_warning">'.
                             &mt('More than one correct result given for question "[_1]": [_2] versus [_3].',
                                 $env{'form.question:'.$i},$correct[$i],$input[$i]).'</span>';
                 } elsif ($input[$i]) {
                    $correct[$i]=$input[$i];
                 }
             }
          }
       }
       for (my $i=0;$i<$number;$i++) {
          if (!$correct[$i]) {
             $result.='<br /><span class="LC_error">'.
                      &mt('No correct result given for question "[_1]"!',
                          $env{'form.question:'.$i}).'</span>';
          }
       }
       $result.='<br />'.&mt("Correct answer: [_1]",join(', ',map { ($_?$_:'-') } @correct));
    }
# Start grading
    my $pcorrect=$env{'form.pcorrect'};
    my $pincorrect=$env{'form.pincorrect'};
    my $storecount=0;
    foreach my $key (keys(%env)) {
       my $user='';
       if ($key=~/^form\.student\:(.*)$/) {
          $user=$1;
       }
       if ($key=~/^form\.unknown\:(.*)$/) {
          my $id=$1;
          if (($env{'form.uname'.$id}) && ($env{'form.udom'.$id})) {
             $user=$env{'form.uname'.$id}.':'.$env{'form.udom'.$id};
          } elsif ($env{'form.multi'.$id}) {
             $user=$env{'form.multi'.$id};
          }
       }
       if ($user) { 
          my @answer=split(/\,/,$env{$key});
          my $sum=0;
          for (my $i=0;$i<$number;$i++) {
             if ($answer[$i]) {
                if ($gradingmechanism eq 'attendance') {
                   $sum+=$pcorrect;
                } else {
                   if ($answer[$i] eq $correct[$i]) {
                      $sum+=$pcorrect;
                   } else {
                      $sum+=$pincorrect;
                   }
                }
             }
          }
          my $ave=$sum/(100*$number);
# Store
          my ($username,$domain)=split(/\:/,$user);
          my %grades=();
          $grades{"resource.$part.solved"}='correct_by_override';
          $grades{"resource.$part.awarded"}=$ave;
          $grades{"resource.regrader"}="$env{'user.name'}:$env{'user.domain'}";
          my $returncode=&Apache::lonnet::cstore(\%grades,$symb,
                                                 $env{'request.course.id'},
                                                 $domain,$username);
          if ($returncode ne 'ok') {
             $result.="<br /><span class=\"LC_error\">Failed to save student $username:$domain. Message when trying to save was ($returncode)</span>";
          } else {
             $storecount++;
          }
       }
    }
# We are done
    $result.='<br />'.&mt('Successfully stored grades for [_1] student(s).',$storecount).
             '</td></tr></table>'."\n".
             '</td></tr></table><br /><br />'."\n";
    return $result.&show_grading_menu_form($symb);
}

sub handler {
    my $request=$_[0];
    &reset_caches();
    if ($env{'browser.mathml'}) {
	&Apache::loncommon::content_type($request,'text/xml');
    } else {
	&Apache::loncommon::content_type($request,'text/html');
    }
    $request->send_http_header;
    return '' if $request->header_only;
    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
    my $symb=&get_symb($request,1);
    my @commands=&Apache::loncommon::get_env_multiple('form.command');
    my $command=$commands[0];

    if ($#commands > 0) {
	&Apache::lonnet::logthis("grades got multiple commands ".join(':',@commands));
    }

    $ssi_error = 0;
    $request->print(&Apache::loncommon::start_page('Grading'));
    if ($symb eq '' && $command eq '') {
	if ($env{'user.adv'}) {
	    if (($env{'form.codeone'}) && ($env{'form.codetwo'}) &&
		($env{'form.codethree'})) {
		my $token=$env{'form.codeone'}.'*'.$env{'form.codetwo'}.'*'.
		    $env{'form.codethree'};
		my ($tsymb,$tuname,$tudom,$tcrsid)=
		    &Apache::lonnet::checkin($token);
		if ($tsymb) {
		    my ($map,$id,$url)=&Apache::lonnet::decode_symb($tsymb);
		    if (&Apache::lonnet::allowed('mgr',$tcrsid)) {
			$request->print(&ssi_with_retries('/res/'.$url, $ssi_retries,
					  ('grade_username' => $tuname,
					   'grade_domain' => $tudom,
					   'grade_courseid' => $tcrsid,
					   'grade_symb' => $tsymb)));
		    } else {
			$request->print('<h3>Not authorized: '.$token.'</h3>');
		    }
		} else {
		    $request->print('<h3>Not a valid DocID: '.$token.'</h3>');
		}
	    } else {
		$request->print(&Apache::lonxml::tokeninputfield());
	    }
	}
    } else {
	&init_perm();
	if ($command eq 'submission' && $perm{'vgr'}) {
	    ($env{'form.student'} eq '' ? &listStudents($request) : &submission($request,0,0));
	} elsif ($command eq 'pickStudentPage' && $perm{'vgr'}) {
	    &pickStudentPage($request);
	} elsif ($command eq 'displayPage' && $perm{'vgr'}) {
	    &displayPage($request);
	} elsif ($command eq 'gradeByPage' && $perm{'mgr'}) {
	    &updateGradeByPage($request);
	} elsif ($command eq 'processGroup' && $perm{'vgr'}) {
	    &processGroup($request);
	} elsif ($command eq 'gradingmenu' && $perm{'vgr'}) {
	    $request->print(&grading_menu($request));
	} elsif ($command eq 'submit_options' && $perm{'vgr'}) {
	    $request->print(&submit_options($request));
	} elsif ($command eq 'viewgrades' && $perm{'vgr'}) {
	    $request->print(&viewgrades($request));
	} elsif ($command eq 'handgrade' && $perm{'mgr'}) {
	    $request->print(&processHandGrade($request));
	} elsif ($command eq 'editgrades' && $perm{'mgr'}) {
	    $request->print(&editgrades($request));
	} elsif ($command eq 'verify' && $perm{'vgr'}) {
	    $request->print(&verifyreceipt($request));
        } elsif ($command eq 'processclicker' && $perm{'mgr'}) {
            $request->print(&process_clicker($request));
        } elsif ($command eq 'processclickerfile' && $perm{'mgr'}) {
            $request->print(&process_clicker_file($request));
        } elsif ($command eq 'assignclickergrades' && $perm{'mgr'}) {
            $request->print(&assign_clicker_grades($request));
	} elsif ($command eq 'csvform' && $perm{'mgr'}) {
	    $request->print(&upcsvScores_form($request));
	} elsif ($command eq 'csvupload' && $perm{'mgr'}) {
	    $request->print(&csvupload($request));
	} elsif ($command eq 'csvuploadmap' && $perm{'mgr'} ) {
	    $request->print(&csvuploadmap($request));
	} elsif ($command eq 'csvuploadoptions' && $perm{'mgr'}) {
	    if ($env{'form.associate'} ne 'Reverse Association') {
		$request->print(&csvuploadoptions($request));
	    } else {
		if ( $env{'form.upfile_associate'} ne 'reverse' ) {
		    $env{'form.upfile_associate'} = 'reverse';
		} else {
		    $env{'form.upfile_associate'} = 'forward';
		}
		$request->print(&csvuploadmap($request));
	    }
	} elsif ($command eq 'csvuploadassign' && $perm{'mgr'} ) {
	    $request->print(&csvuploadassign($request));
	} elsif ($command eq 'scantron_selectphase' && $perm{'mgr'}) {
	    $request->print(&scantron_selectphase($request));
 	} elsif ($command eq 'scantron_warning' && $perm{'mgr'}) {
 	    $request->print(&scantron_do_warning($request));
	} elsif ($command eq 'scantron_validate' && $perm{'mgr'}) {
	    $request->print(&scantron_validate_file($request));
	} elsif ($command eq 'scantron_process' && $perm{'mgr'}) {
	    $request->print(&scantron_process_students($request));
 	} elsif ($command eq 'scantronupload' && 
 		 (&Apache::lonnet::allowed('usc',$env{'request.role.domain'})||
		  &Apache::lonnet::allowed('usc',$env{'request.course.id'}))) {
 	    $request->print(&scantron_upload_scantron_data($request)); 
 	} elsif ($command eq 'scantronupload_save' &&
 		 (&Apache::lonnet::allowed('usc',$env{'request.role.domain'})||
		  &Apache::lonnet::allowed('usc',$env{'request.course.id'}))) {
 	    $request->print(&scantron_upload_scantron_data_save($request));
 	} elsif ($command eq 'scantron_download' &&
		 &Apache::lonnet::allowed('usc',$env{'request.course.id'})) {
 	    $request->print(&scantron_download_scantron_data($request));
	} elsif ($command) {
	    $request->print("Access Denied ($command)");
	}
    }
    if ($ssi_error) {
	&ssi_print_error($request);
    }
    $request->print(&Apache::loncommon::end_page());
    &reset_caches();
    return '';
}

1;

__END__;

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