# The LearningOnline Network with CAPA
# input  definitons
#
# $Id: inputtags.pm,v 1.248.2.1 2008/12/10 22:47:31 raeburn 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::inputtags;
use HTML::Entities();
use strict;
use Apache::loncommon;
use Apache::lonlocal;
use Apache::lonnet;
use LONCAPA;
 

BEGIN {
    &Apache::lonxml::register('Apache::inputtags',('hiddenline','textfield','textline'));
}

#   Initializes a set of global variables used during the parse of the problem.
#
#  @Apache::inputtags::input        - List of current input ids.
#  @Apache::inputtags::inputlist    - List of all input ids seen this problem.
#  @Apache::inputtags::response     - List of all current resopnse ids.
#  @Apache::inputtags::responselist - List of all response ids seen this 
#                                       problem.
#  @Apache::inputtags::hint         - List of all hint ids.
#  @Apache::inputtags::hintlist     - List of all hint ids seen this problem.
#  @Apache::inputtags::previous     - List describing if specific responseds
#                                       have been used
#  @Apache::inputtags::previous_version - Submission responses were used in.
#  $Apache::inputtags::part         - Current part id (valid only in 
#                                       <problem>)
#                                     0 if not in a part.
#  @Apache::inputtags::partlist     - List of part ids seen in the current
#                                       <problem>
#  @Apache::inputtags::status       - List of problem  statuses. First 
#                                     element is the status of the <problem>
#                                     the remainder are for individual <part>s.
#  %Apache::inputtags::params       - Hash of defined parameters for the
#                                     current response.
#  @Apache::inputtags::import       - List of all ids for <import> thes get
#                                     join()ed and prepended.
#  @Apache::inputtags::importlist   - List of all import ids seen.
#  $Apache::inputtags::response_with_no_part
#                                   - Flag set true if we have seen a response
#                                     that is not inside a <part>
#  %Apache::inputtags::answertxt    - <*response> tags store correct
#                                     answer strings for display by <textline/>
#                                     in this hash.
#  %Apache::inputtags::submission_display
#                                   - <*response> tags store improved display
#                                     of submission strings for display by part
#                                     end.

sub initialize_inputtags {
    @Apache::inputtags::input=();
    @Apache::inputtags::inputlist=();
    @Apache::inputtags::response=();
    @Apache::inputtags::responselist=();
    @Apache::inputtags::hint=();
    @Apache::inputtags::hintlist=();
    @Apache::inputtags::previous=();
    @Apache::inputtags::previous_version=();
    $Apache::inputtags::part='';
    @Apache::inputtags::partlist=();
    @Apache::inputtags::status=();
    %Apache::inputtags::params=();
    @Apache::inputtags::import=();
    @Apache::inputtags::importlist=();
    $Apache::inputtags::response_with_no_part=0;
    %Apache::inputtags::answertxt=();
    %Apache::inputtags::submission_display=();
}

sub check_for_duplicate_ids {
    my %check;
    foreach my $id (@Apache::inputtags::partlist,
		    @Apache::inputtags::responselist,
		    @Apache::inputtags::hintlist,
		    @Apache::inputtags::importlist) {
	$check{$id}++;
    }
    my @duplicates;
    foreach my $id (sort(keys(%check))) {
	if ($check{$id} > 1) {
	    push(@duplicates,$id);
	}
    }
    if (@duplicates) {
	&Apache::lonxml::error("Duplicated ids found, problem will operate incorrectly. Duplicated ids seen: ",join(', ',@duplicates));
    }
}

sub start_input {
    my ($parstack,$safeeval)=@_;
    my $id = &Apache::lonxml::get_id($parstack,$safeeval);
    push (@Apache::inputtags::input,$id);
    push (@Apache::inputtags::inputlist,$id);
    return $id;
}

sub end_input {
    pop @Apache::inputtags::input;
    return '';
}

sub addchars {
    my ($fieldid,$addchars)=@_;
    my $output='';
    foreach (split(/\,/,$addchars)) {
	$output.='<a href="javascript:void(document.forms.lonhomework.'.
	    $fieldid.'.value+=\''.$_.'\')">'.$_.'</a> ';
    }
    return $output;
}

sub start_textfield {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result = "";
    my $id = &start_input($parstack,$safeeval);
    my $resid=$Apache::inputtags::response[-1];
    if ($target eq 'web') {
	$Apache::lonxml::evaluate--;
	my $partid=$Apache::inputtags::part;
	my $oldresponse = &HTML::Entities::encode($Apache::lonhomework::history{"resource.$partid.$resid.submission"},'<>&"');
	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
	    my $cols = &Apache::lonxml::get_param('cols',$parstack,$safeeval);
	    if ( $cols eq '') { $cols = 80; }
	    my $rows = &Apache::lonxml::get_param('rows',$parstack,$safeeval);
	    if ( $rows eq '') { $rows = 16; }
	    my $addchars=&Apache::lonxml::get_param('addchars',$parstack,$safeeval);
	    $result='';
	    if ($addchars) {
		$result.=&addchars('HWVAL_'.$resid,$addchars);
	    }
	    &Apache::lonhtmlcommon::add_htmlareafields('HWVAL_'.$resid);
	    $result.= '<textarea wrap="hard" name="HWVAL_'.$resid.'" id="HWVAL_'.$resid.'" '.
		"rows=\"$rows\" cols=\"$cols\">".$oldresponse;
	    if ($oldresponse ne '') {

		#get rid of any startup text if the user has already responded
		&Apache::lonxml::get_all_text("/textfield",$parser,$style);
	    }
	} else {
	    #show past answer in the essayresponse case
	    if ($oldresponse =~ /\S/
		&& &Apache::londefdef::is_inside_of($tagstack,
						    'essayresponse') ) {
		$result='<table class="LC_pastsubmission"><tr><td>'.
		    $oldresponse.'</td></tr></table>';
	    }
	    #get rid of any startup text
	    &Apache::lonxml::get_all_text("/textfield",$parser,$style);
	}
    } elsif ($target eq 'grade') {
	my $seedtext=&Apache::lonxml::get_all_text("/textfield",$parser,
						   $style);
	if ($seedtext eq $env{'form.HWVAL_'.$resid}) {
	    # if the seed text is still there it wasn't a real submission
	    $env{'form.HWVAL_'.$resid}='';
	}
    } elsif ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Rows:','rows',$token,4);
	$result.=&Apache::edit::text_arg('Columns:','cols',$token,4);
	$result.=&Apache::edit::text_arg
	    ('Click-On Texts (comma sep):','addchars',$token,10);
	my $bodytext=&Apache::lonxml::get_all_text("/textfield",$parser,
						   $style);
	$result.=&Apache::edit::editfield($token->[1],$bodytext,'Text you want to appear by default:',80,2);
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'rows','cols',
						     'addchars');
	if ($constructtag) {
	    $result = &Apache::edit::rebuild_tag($token);
	} else {
	    $result=$token->[4];
	}
	$result.=&Apache::edit::modifiedfield("/textfield",$parser);
    } elsif ($target eq 'tex') {
	my $number_of_lines = &Apache::lonxml::get_param('rows',$parstack,$safeeval);
	my $width_of_box = &Apache::lonxml::get_param('cols',$parstack,$safeeval);
	if ($$tagstack[-2] eq 'essayresponse' and $Apache::lonhomework::type eq 'exam') {
	    $result = '\fbox{\fbox{\parbox{\textwidth-5mm}{';
	    for (my $i=0;$i<int $number_of_lines*2;$i++) {$result.='\strut \\\\ ';}
	    $result.='\strut \\\\\strut \\\\\strut \\\\\strut \\\\}}}';
	} else {
	    my $TeXwidth=$width_of_box/80;
	    $result = '\vskip 1 mm \fbox{\fbox{\parbox{'.$TeXwidth.'\textwidth-5mm}{';
	    for (my $i=0;$i<int $number_of_lines*2;$i++) {$result.='\strut \\\\ ';}
	    $result.='}}}\vskip 2 mm ';
	}
    }
    return $result;
}

sub end_textfield {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $result;
    if ($target eq 'web') {
	$Apache::lonxml::evaluate++;
	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
	    return "</textarea>";
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::end_table();
    }
    &end_input;
    return $result;
}

sub exam_score_line {
    my ($target) = @_;

    my $result;
    if ($target eq 'tex') {
	my $repetition = &Apache::response::repetition();
	$result.='\begin{enumerate}';
	if ($env{'request.state'} eq "construct" ) {$result.='\item[\strut]';}
	foreach my $i (0..$repetition-1) {
	    $result.='\item[\textbf{'.
		($Apache::lonxml::counter+$i).
		'}.]\textit{Leave blank on scoring form}\vskip 0 mm';
	}
	$result.= '\end{enumerate}';
    }

    return $result;
}

sub exam_box {
    my ($target) = @_;
    my $result;

    if ($target eq 'tex') {
	$result .= '\fbox{\fbox{\parbox{\textwidth-5mm}{\strut\\\\\strut\\\\\strut\\\\\strut\\\\}}}';
	$result .= &exam_score_line($target);
    } elsif ($target eq 'web') {
	my $id=$Apache::inputtags::response[-1];
	$result.= '<br /><br />
                   <textarea name="HWVAL_'.$id.'" rows="4" cols="50">
                   </textarea> <br /><br />';
    }
    return $result;
}

sub needs_exam_box {
    my ($tagstack) = @_;
    my @tags = ('formularesponse',
		'stringresponse',
		'reactionresponse',
		'organicresponse',
		);

    foreach my $tag (@tags) {
	if (grep(/\Q$tag\E/,@$tagstack)) {
	    return 1;
	}
    }
    return 0;
}

sub start_textline {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $result = "";
    my $input_id = &start_input($parstack,$safeeval);
    if ($target eq 'web') {
	$Apache::lonxml::evaluate--;
	my $partid=$Apache::inputtags::part;
	my $id=$Apache::inputtags::response[-1];
	if (!&Apache::response::show_answer()) {
	    my $size = &Apache::lonxml::get_param('size',$parstack,$safeeval);
	    my $maxlength;
	    if ($size eq '') { $size=20; } else {
		if ($size < 20) {
		    $maxlength = ' maxlength="'.$size.'"';
		}
	    }
	    my $oldresponse = $Apache::lonhomework::history{"resource.$partid.$id.submission"};
	    &Apache::lonxml::debug("oldresponse $oldresponse is ".ref($oldresponse));

	    if (ref($oldresponse) eq 'ARRAY') {
		$oldresponse = $oldresponse->[$#Apache::inputtags::inputlist];
	    }
	    $oldresponse = &HTML::Entities::encode($oldresponse,'<>&"');
            $oldresponse =~ s/^\s+//;
            $oldresponse =~ s/\s+$//;
            $oldresponse =~ s/\s+/ /g;
	    if ($Apache::lonhomework::type ne 'exam') {
		my $addchars=&Apache::lonxml::get_param('addchars',$parstack,$safeeval);
		$result='';
		if ($addchars) {
		    $result.=&addchars('HWVAL_'.$id,$addchars);
		}
		my $readonly=&Apache::lonxml::get_param('readonly',$parstack,
							$safeeval);
		if (lc($readonly) eq 'yes' 
		    || $Apache::inputtags::status[-1] eq 'CANNOT_ANSWER') {
		    $readonly=' readonly="readonly" ';
		} else {
		    $readonly='';
		}
		my $name = 'HWVAL_'.$id;
		if ($Apache::inputtags::status[-1] eq 'CANNOT_ANSWER') {
		    $name = "none";
		}
		$result.= '<input onkeydown="javascript:setSubmittedPart(\''.$partid.'\');" type="text" '.$readonly.' name="'.$name.'" value="'.
		    $oldresponse.'" size="'.$size.'"'.$maxlength.' />';
	    }
	    if ($Apache::lonhomework::type eq 'exam'
		&& &needs_exam_box($tagstack)) {
		$result.=&exam_box($target);
	    }
	} else {
	    #right or wrong don't show what was last typed in.
	    my $count = scalar(@Apache::inputtags::inputlist)-1;
	    $result='<b>'.$Apache::inputtags::answertxt{$id}[$count].'</b>';
	    #$result='';
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Size:','size',$token,'5').
	    &Apache::edit::text_arg('Click-On Texts (comma sep):',
				    'addchars',$token,10);
        $result.=&Apache::edit::select_arg('Readonly:','readonly',
					   ['no','yes'],$token);
	$result.=&Apache::edit::end_row();
	$result.=&Apache::edit::end_table();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'size',
						     'addchars','readonly');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    } elsif ($target eq 'tex' 
	     && $Apache::lonhomework::type ne 'exam') {
	my $size = &Apache::lonxml::get_param('size',$parstack,$safeeval);
	if ($size != 0) {$size=$size*2; $size.=' mm';} else {$size='40 mm';}
	if ($env{'form.pdfFormFields'} eq 'yes') {
            my $fieldname = $env{'request.symb'}.
                                 '&part_'. $Apache::inputtags::part.
                                 '&textresponse'.
                                 '&HWVAL_' . $Apache::inputtags::response['-1'];
            $result="\n\\\\\n".'\textField{'.$fieldname.'}{'.$size.'}{12 bp}';
        } else {
            $result='\framebox['.$size.'][s]{\tiny\strut}';
        }
    } elsif ($target eq 'tex' 
	     && $Apache::lonhomework::type eq 'exam'
	     && &needs_exam_box($tagstack)) {
	$result.=&exam_box($target);
    }
    return $result;
}

sub end_textline {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    if    ($target eq 'web') { $Apache::lonxml::evaluate++; }
    elsif ($target eq 'edit') { return ('','no'); }
    &end_input();
    return "";
}

sub start_hiddenline {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $result = "";
    my $input_id = &start_input($parstack,$safeeval);
    if ($target eq 'web') {
	$Apache::lonxml::evaluate--;
	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
	    my $partid=$Apache::inputtags::part;
	    my $id=$Apache::inputtags::response[-1];
	    my $oldresponse = $Apache::lonhomework::history{"resource.$partid.$id.submission"};
	    if (ref($oldresponse) eq 'ARRAY') {
		$oldresponse = $oldresponse->[$#Apache::inputtags::inputlist];
	    }
	    $oldresponse = &HTML::Entities::encode($oldresponse,'<>&"');

	    if ($Apache::lonhomework::type ne 'exam') {
		$result= '<input type="hidden" name="HWVAL_'.$id.'" value="'.
		    $oldresponse.'" />';
	    }
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::end_table;
    }

    if ( ($target eq 'web' || $target eq 'tex')
	 && $Apache::lonhomework::type eq 'exam'
	 && &needs_exam_box($tagstack)) {
	$result.=&exam_box($target);
    }
    return $result;
}

sub end_hiddenline {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    if    ($target eq 'web') { $Apache::lonxml::evaluate++; }
    elsif ($target eq 'edit') { return ('','no'); }
    &end_input();
    return "";
}

# $part -> partid
# $id -> responseid
# $uploadefiletypes -> comma seperated list of extensions allowed or * for any
# $which -> 'uploadedonly'  -> only newly uploaded files
#           'portfolioonly' -> only allow files from portfolio
#           'both' -> allow files from either location
# $extratext -> additional text to go between the link and the input box
# returns a table row <tr> 
sub file_selector {
    my ($part,$id,$uploadedfiletypes,$which,$extratext)=@_;
    if (!$uploadedfiletypes) { return ''; }

    my $jspart=$part;
    $jspart=~s/\./_/g;

    my $result;
    
    $result.='<tr><td>';
    if ($uploadedfiletypes ne '*') {
	$result.=
	    &mt('Allowed filetypes: <b>[_1]</b>',$uploadedfiletypes).'<br />';
    }
    if ($which eq 'uploadonly' || $which eq 'both') { 
	$result.=&mt('Submit a file: (only one file can be uploaded)').
	    ' <br /><input type="file" size="50" name="HWFILE'.
	    $jspart.'_'.$id.'" /><br />';
	$result .= &show_past_file_submission($part,$id);
    }
    if ( $which eq 'both') { 
	$result.='<br />'.'<strong>'.&mt('OR:').'</strong><br />';
    }
    if ($which eq 'portfolioonly' || $which eq 'both') { 
	$result.=$extratext.'<a href='."'".'javascript:void(window.open("/adm/portfolio?mode=selectfile&amp;fieldname='.$env{'form.request.prefix'}.'HWPORT'.$jspart.'_'.$id.'","cat","height=600,width=800,scrollbars=1,resizable=1,menubar=2,location=1"))'."'".'>'.
	    &mt('Select Portfolio Files').'</a><br />'.
	    '<input type="text" size="50" name="HWPORT'.$jspart.'_'.$id.'" value="" />'.
	    '<br />';
	$result .= &show_past_portfile_submission($part,$id);

    }
    $result.='</td></tr>'; 
    return $result;
}

sub show_past_file_submission {
    my ($part,$id) = @_;
    my $uploadedfile= &HTML::Entities::encode($Apache::lonhomework::history{"resource.$part.$id.uploadedfile"},'<>&"');

    return if (!$uploadedfile);

    my $url=$Apache::lonhomework::history{"resource.$part.$id.uploadedurl"};
    &Apache::lonxml::extlink($url);
    &Apache::lonnet::allowuploaded('/adm/essayresponse',$url);
    my $icon=&Apache::loncommon::icon($url);
    my $curfile='<a href="'.$url.'"><img src="'.$icon.
	'" border="0" />'.$uploadedfile.'</a>';
    return &mt('Currently submitted: <tt>[_1]</tt>',$curfile);

}

sub show_past_portfile_submission {
    my ($part,$id) = @_;
    if ($Apache::lonhomework::history{"resource.$part.$id.portfiles"}!~/[^\s]/){
	return;
    }
    my (@file_list,@bad_file_list);
    foreach my $file (split(/\s*,\s*/,&unescape($Apache::lonhomework::history{"resource.$part.$id.portfiles"}))) {
	my (undef,undef,$domain,$user)=&Apache::lonnet::whichuser();
	my $url="/uploaded/$domain/$user/portfolio$file";
	my $icon=&Apache::loncommon::icon($url);
	push(@file_list,'<a href="'.$url.'"><img src="'.$icon.
	     '" border="0" />'.$file.'</a>');
	if (! &Apache::lonnet::stat_file($url)) {
	    &Apache::lonnet::logthis("bad file is $url");
	    push(@bad_file_list,'<a href="'.$url.'"><img src="'.$icon.
		 '" border="0" />'.$file.'</a>');
	}
    }
    my $files = '<span class="LC_filename">'.
	join('</span>, <span class="LC_filename">',@file_list).
	'</span>';
    my $result = &mt("Portfolio files previously selected: [_1]",$files);
    if (@bad_file_list) {
	my $bad_files = '<span class="LC_filename">'.
	    join('</span>, <span class="LC_filename">',@bad_file_list).
	    '</span>';
	$result.='<br />'.&mt('<span class="LC_error">These file(s) don\'t exist:</span> [_1]',$bad_files);
    }
    return $result;

}

sub valid_award {
    my ($award) =@_;
    foreach my $possibleaward ('EXTRA_ANSWER','MISSING_ANSWER', 'ERROR',
			       'NO_RESPONSE',
			       'TOO_LONG', 'UNIT_INVALID_INSTRUCTOR',
			       'UNIT_INVALID_STUDENT', 'UNIT_IRRECONCIBLE',
			       'UNIT_FAIL', 'NO_UNIT',
			       'UNIT_NOTNEEDED', 'WANTED_NUMERIC',
			       'BAD_FORMULA', 'INTERNAL_ERROR', 'SIG_FAIL', 'INCORRECT', 
			       'MISORDERED_RANK', 'INVALID_FILETYPE',
                               'EXCESS_FILESIZE', 'DRAFT',
			       'SUBMITTED', 'ASSIGNED_SCORE',
			       'APPROX_ANS', 'EXACT_ANS','COMMA_FAIL') {
	if ($award eq $possibleaward) { return 1; }
    }
    return 0;
}

{
    my @awards = ('EXTRA_ANSWER', 'MISSING_ANSWER', 'ERROR', 'NO_RESPONSE',
		  'TOO_LONG',
		  'UNIT_INVALID_INSTRUCTOR', 'UNIT_INVALID_STUDENT',
		  'UNIT_IRRECONCIBLE', 'UNIT_FAIL', 'NO_UNIT',
		  'UNIT_NOTNEEDED', 'WANTED_NUMERIC', 'BAD_FORMULA', 'INTERNAL_ERROR',
		  'COMMA_FAIL', 'SIG_FAIL', 'INCORRECT', 'MISORDERED_RANK',
		  'INVALID_FILETYPE', 'EXCESS_FILESIZE', 'DRAFT', 'SUBMITTED',
                  'ASSIGNED_SCORE', 'APPROX_ANS', 'EXACT_ANS');
    my $i=0;
    my %fwd_awards = map { ($_,$i++) } @awards;
    my $max=scalar(@awards);
    @awards=reverse(@awards);
    $i=0;
    my %rev_awards = map { ($_,$i++) } @awards;

sub awarddetail_to_awarded {
    my ($awarddetail) = @_;
    if ($awarddetail eq 'EXACT_ANS'
	|| $awarddetail eq 'APPROX_ANS') {
	return 1;
    }
    return 0;
}

sub hide_award {
    my ($award) = @_;
    if (&Apache::lonhomework::show_no_problem_status()) {
	return 1;
    }
    if ($award =~
	/^(?:EXACT_ANS|APPROX_ANS|SUBMITTED|ASSIGNED_SCORE|INCORRECT)/) {
	return 1;
    }
    return 0;
}

sub finalizeawards {
    my ($awardref,$msgref,$nameref,$reverse,$final_scantron)=@_;
    my $result;
    if ($#$awardref == -1) { $result = "NO_RESPONSE"; }
    if ($result eq '' ) {
	my $blankcount;
	foreach my $award (@$awardref) {
	    if ($award eq '') {
		$result='MISSING_ANSWER';
		$blankcount++;
	    }
	}
	if ($blankcount == ($#$awardref + 1)) {
	    return ('NO_RESPONSE');
	}
    }

    if ($Apache::lonxml::internal_error) { $result='INTERNAL_ERROR'; }

    if (!$final_scantron && defined($result)) { return ($result); }

    # if in scantron mode, if the award for any response is 
    # assigned score, then the part gets an assigned score
    if ($final_scantron 
	&& grep {$_ eq 'ASSIGNED_SCORE'} (@$awardref)) {
	return ('ASSIGNED_SCORE');
    }

    # if in scantron mode, if the award for any response is 
    # correct and there are non-correct responses,
    # then the part gets an assigned score
    if ($final_scantron 
	&& (grep { $_ eq 'EXACT_ANS' ||
		   $_ eq 'APPROX_ANS'  } (@$awardref))
	&& (grep { $_ ne 'EXACT_ANS' &&
		   $_ ne 'APPROX_ANS'  } (@$awardref))) {
	return ('ASSIGNED_SCORE');
    }
    # these awards are ordered from most important error through best correct
    my $awards = (!$reverse) ? \%fwd_awards : \%rev_awards ;

    my $best = $max;
    my $j=0;
    my $which;
    foreach my $award (@$awardref) {
	if ($awards->{$award} < $best) {
	    $best  = $awards->{$award};
	    $which = $j;
	}
	$j++;
    }

    if (defined($which)) {
	if (ref($nameref)) {
	    return ($$awardref[$which],$$msgref[$which],$$nameref[$which]);
	} else {
	    return ($$awardref[$which],$$msgref[$which]);
	}
    }
    return ('ERROR',undef);
}
}

sub decideoutput {
    my ($award,$awarded,$awardmsg,$solved,$previous,$target)=@_;
    my $message='';
    my $button=0;
    my $previousmsg;
    my $css_class='orange';
    my $added_computer_text=0;
    my %possible_class =
	( 'correct'         => 'LC_answer_correct',
	  'charged_try'     => 'LC_answer_charged_try',
	  'not_charged_try' => 'LC_answer_not_charged_try',
	  'no_grade'        => 'LC_answer_no_grade',
	  'no_message'      => 'LC_no_message',
	  );

    my $part = $Apache::inputtags::part;
    my $tohandgrade = &Apache::lonnet::EXT("resource.$part.handgrade");
    my $handgrade = ('yes' eq lc($tohandgrade)); 
    
    my $computer = ($handgrade)? ''
	                       : " ".&mt("Computer's answer now shown above.");
    &Apache::lonxml::debug("handgrade has :$handgrade:");

    if ($previous) { $previousmsg=&mt('You have entered that answer before'); }
    
    if ($solved =~ /^correct/) {
        $css_class=$possible_class{'correct'};
	$message=&mt('You are correct.');
	if ($awarded < 1 && $awarded > 0) {
	    $message=&mt('You are partially correct.');
	    $css_class=$possible_class{'not_charged_try'};
	} elsif ($awarded < 1) {
	    $message=&mt('Incorrect.');
	    $css_class=$possible_class{'charged_try'};
	}
	if ($env{'request.filename'} =~ 
	    m|/res/lib/templates/examupload.problem$|) {
	    $message = &mt("A score has been assigned.");
	    $added_computer_text=1;
	} else {
	    if ($target eq 'tex') {
		$message = '\textbf{'.$message.'}';
	    } else {
		$message = "<b>".$message."</b>";
		$message.= $computer;
	    }
	    $added_computer_text=1;
	    if ($awarded > 0) {
		my ($symb) = &Apache::lonnet::whichuser();
		if (($symb ne '') 
		    &&
		    ($env{'course.'.$env{'request.course.id'}.
			      '.disable_receipt_display'} ne 'yes') &&
                    ($Apache::lonhomework::type ne 'practice')) { 
		    $message.=(($target eq 'web')?'<br />':' ').
			&mt('Your receipt is [_1]',
			    (&Apache::lonnet::receipt($Apache::inputtags::part).
			     (($target eq 'web')?&Apache::loncommon::help_open_topic('Receipt'):'')));
		}
	    }
	}
	$button=0;
	$previousmsg='';
    } elsif ($solved =~ /^excused/) {
	if ($target eq 'tex') {
	    $message = ' \textbf{'.&mt('You are excused from the problem.').'} ';
	} else {
	    $message = "<b>".&mt('You are excused from the problem.')."</b>";
	}
	$css_class=$possible_class{'charged_try'};
	$button=0;
	$previousmsg='';
    } elsif ($award eq 'EXACT_ANS' || $award eq 'APPROX_ANS' ) {
	if ($solved =~ /^incorrect/ || $solved eq '') {
	    $message = &mt("Incorrect").".";
	    $css_class=$possible_class{'charged_try'};
	    $button=1;
	} else {
	    if ($target eq 'tex') {
		$message = '\textbf{'.&mt('You are correct.').'}';
	    } else {
		$message = "<b>".&mt('You are correct.')."</b>";
		$message.= $computer;
	    }
	    $added_computer_text=1;
	    if  ($awarded > 0 
		 && $env{'course.'.
			     $env{'request.course.id'}.
			     '.disable_receipt_display'} ne 'yes') { 
		$message.=(($target eq 'web')?'<br />':' ').
		    &mt('Your receipt is [_1]',
			(&Apache::lonnet::receipt($Apache::inputtags::part).
			 (($target eq 'web')?&Apache::loncommon::help_open_topic('Receipt'):'')));
	    }
	    $css_class=$possible_class{'correct'};
	    $button=0;
	    $previousmsg='';
	}
    } elsif ($award eq 'NO_RESPONSE') {
	$message = '';
	$css_class=$possible_class{'no_feedback'};
	$button=1;
    } elsif ($award eq 'EXTRA_ANSWER') {
	$message = &mt('Some extra items were submitted.');
	$css_class=$possible_class{'not_charged_try'};
	$button = 1;
    } elsif ($award eq 'MISSING_ANSWER') {
	$message = &mt('Some items were not submitted.');
        if ($target ne 'tex') {
           $message .= &Apache::loncommon::help_open_topic('Some_Items_Were_Not_Submitted');
        }
	$css_class=$possible_class{'not_charged_try'};
	$button = 1;
    } elsif ($award eq 'ERROR') {
	$message = &mt('An error occurred while grading your answer.');
	$css_class=$possible_class{'not_charged_try'};
	$button = 1;
    } elsif ($award eq 'TOO_LONG') {
	$message = &mt("The submitted answer was too long.");
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'WANTED_NUMERIC') {
	$message = &mt("This question expects a numeric answer.");
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'MISORDERED_RANK') {
        $message = &mt('You have provided an invalid ranking.');
        if ($target ne 'tex') {
            $message.=' '.&mt('Please refer to [_1]',&Apache::loncommon::help_open_topic('Ranking_Problems',&mt('help on ranking problems')));
        }
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'EXCESS_FILESIZE') {
        $message = &mt('Submission won\'t be graded. The combined size of submitted files exceeded the amount allowed.');
        $css_class=$possible_class{'not_charged_try'};
        $button=1;

    } elsif ($award eq 'INVALID_FILETYPE') {
	$message = &mt('Submission won\'t be graded. The type of file submitted is not allowed.');
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'SIG_FAIL') {
	my ($used,$min,$max)=split(':',$awardmsg);
	my $word = ($used < $min) ? 'more' : 'fewer';
	$message = &mt("Submission not graded.  Use $word digits.",$used);
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'UNIT_INVALID_INSTRUCTOR') {
	$message = &mt('Error in instructor specifed unit. This error has been reported to the instructor.', $awardmsg);
	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'UNIT_INVALID_STUDENT') {
	$message = &mt('Unable to interpret units. Computer reads units as "[_1]".',&markup_unit($awardmsg,$target));
	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'UNIT_FAIL' || $award eq 'UNIT_IRRECONCIBLE') {
	$message = &mt('Incompatible units. No conversion found between "[_1]" and the required units.',&markup_unit($awardmsg,$target));
	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units');} 
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'UNIT_NOTNEEDED') {
	$message = &mt('Only a number required. Computer reads units of "[_1]".',&markup_unit($awardmsg,$target));
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'NO_UNIT') {
	$message = &mt("Units required").'.';
	if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Physical_Units')};
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'COMMA_FAIL') {
	$message = &mt("Proper comma separation is required").'.';
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'BAD_FORMULA') {
	$message = &mt("Unable to understand formula").'.';
        if ($target ne 'tex') {$message.=&Apache::loncommon::help_open_topic('Formula_Answers')};
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'INTERNAL_ERROR') {
        $message = &mt("An internal error occurred while processing your answer. Please try again later.");
        $css_class=$possible_class{'not_charged_try'};
        $button=1;
    } elsif ($award eq 'INCORRECT') {
	$message = &mt("Incorrect").'.';
	$css_class=$possible_class{'charged_try'};
	$button=1;
    } elsif ($award eq 'SUBMITTED') {
	$message = &mt("Your submission has been recorded.");
	$css_class=$possible_class{'no_grade'};
	$button=1;
    } elsif ($award eq 'DRAFT') {
	$message = &mt("A draft copy has been saved.");
	$css_class=$possible_class{'not_charged_try'};
	$button=1;
    } elsif ($award eq 'ASSIGNED_SCORE') {
	$message = &mt("A score has been assigned.");
	$css_class=$possible_class{'correct'};
	$button=0;
    } elsif ($award eq '') {
	if ($handgrade && $Apache::inputtags::status[-1] eq 'SHOW_ANSWER') {
	    $message = &mt("Nothing submitted.");
	    $css_class=$possible_class{'charged_try'};
	} else {
	    $css_class=$possible_class{'not_charged_try'};
	}
	$button=1;
    } else {
	$message = &mt("Unknown message").": $award";
	$button=1;
    }
    my (undef,undef,$domain,$user)=&Apache::lonnet::whichuser();
    foreach my $resid(@Apache::inputtags::response){
        if ($Apache::lonhomework::history{"resource.$part.$resid.handback"}) {
	    $message.='<br />';
	    my @files = split(/\s*,\s*/,
			      $Apache::lonhomework::history{"resource.$part.$resid.handback"});
	    my $file_msg;
	    foreach my $file (@files) {
		$file_msg.= '<br /><a href="/uploaded/'."$domain/$user".'/'.$file.'">'.$file.'</a>';
	    }
	    $message .= &mt('Returned file(s): [_1]',$file_msg);
	}
    }

    if (&Apache::lonhomework::hide_problem_status()
	&& $Apache::inputtags::status[-1] ne 'SHOW_ANSWER'
	&& &hide_award($award)) {
	$message = &mt("Answer Submitted: Your final submission will be graded after the due date.");
	$css_class=$possible_class{'no_grade'};
	$button=1;
    }
    if ($Apache::inputtags::status[-1] eq 'SHOW_ANSWER' && 
	!$added_computer_text && $target ne 'tex') {
	$message.= $computer;
	$added_computer_text=1;
    }
    if ($Apache::lonhomework::type eq 'practice') {
       if ($target eq 'web') {
           $message .= '<br />';
       } else {
           $message .= ' ';      
       }
       $message.=&mt('Submissions to practice problems are not permanently recorded.');
    }

    return ($button,$css_class,$message,$previousmsg);
}

sub markup_unit {
    my ($unit,$target)=@_;
    if ($target eq 'tex') {
	return '\texttt{'.&Apache::lonxml::latex_special_symbols($unit).'}'; 
    } else {
	return "<tt>".$unit."</tt>";
    }
}

sub removealldata {
    my ($id)=@_;
    foreach my $key (keys(%Apache::lonhomework::results)) {
	if (($key =~ /^resource\.\Q$id\E\./) && ($key !~ /\.collaborators$/)) {
	    &Apache::lonxml::debug("Removing $key");
	    delete($Apache::lonhomework::results{$key});
	}
    }
}

sub hidealldata {
    my ($id)=@_;
    foreach my $key (keys(%Apache::lonhomework::results)) {
	if (($key =~ /^resource\.\Q$id\E\./) && ($key !~ /\.collaborators$/)) {
	    &Apache::lonxml::debug("Hidding $key");
	    my $newkey=$key;
	    $newkey=~s/^(resource\.\Q$id\E\.[^\.]+\.)(.*)$/${1}hidden${2}/;
	    $Apache::lonhomework::results{$newkey}=
		$Apache::lonhomework::results{$key};
	    delete($Apache::lonhomework::results{$key});
	}
    }
}

sub setgradedata {
    my ($award,$msg,$id,$previously_used) = @_;
    if ($Apache::lonhomework::scantronmode && 
	&Apache::lonnet::validCODE($env{'form.CODE'})) {
	$Apache::lonhomework::results{"resource.CODE"}=$env{'form.CODE'};
    } elsif ($Apache::lonhomework::scantronmode && 
	     $env{'form.CODE'} eq '' &&
	     $Apache::lonhomework::history{"resource.CODE"} ne '') {
	$Apache::lonhomework::results{"resource.CODE"}='';
    }

    if (!$Apache::lonhomework::scantronmode &&
	$Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
	$Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER') {
	$Apache::lonhomework::results{"resource.$id.afterduedate"}=$award;
	return '';
    } elsif ( $Apache::lonhomework::history{"resource.$id.solved"} !~
	      /^correct/ 
	      || $Apache::lonhomework::scantronmode 
	      || &Apache::lonhomework::hide_problem_status()  ) {
        # the student doesn't already have it correct,
	# or we are in a mode (scantron orno problem status) where a correct 
        # can become incorrect
	# handle assignment of tries and solved status
	my $solvemsg;
	if ($Apache::lonhomework::scantronmode) {
	    $solvemsg='correct_by_scantron';
	} else {
	    $solvemsg='correct_by_student';
	}
	if ($Apache::lonhomework::history{"resource.$id.afterduedate"}) {
	    $Apache::lonhomework::results{"resource.$id.afterduedate"}='';
	}
	if ( $award eq 'ASSIGNED_SCORE') {
	    $Apache::lonhomework::results{"resource.$id.tries"} =
		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
	    $Apache::lonhomework::results{"resource.$id.solved"} =
		$solvemsg;
	    my $numawards=scalar(@Apache::inputtags::response);
	    $Apache::lonhomework::results{"resource.$id.awarded"} = 0;
	    foreach my $res (@Apache::inputtags::response) {
		if (defined($Apache::lonhomework::results{"resource.$id.$res.awarded"})) {
		    $Apache::lonhomework::results{"resource.$id.awarded"}+=
			$Apache::lonhomework::results{"resource.$id.$res.awarded"};
		} else {
		    $Apache::lonhomework::results{"resource.$id.awarded"}+=
			&awarddetail_to_awarded($Apache::lonhomework::results{"resource.$id.$res.awarddetail"});
		}
	    }
	    if ($numawards > 0) {
		$Apache::lonhomework::results{"resource.$id.awarded"}/=
		    $numawards;
	    }
	} elsif ( $award eq 'APPROX_ANS' || $award eq 'EXACT_ANS' ) {
	    $Apache::lonhomework::results{"resource.$id.tries"} =
		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
	    $Apache::lonhomework::results{"resource.$id.solved"} =
		$solvemsg;
	    $Apache::lonhomework::results{"resource.$id.awarded"} = '1';
	} elsif ( $award eq 'INCORRECT' ) {
	    $Apache::lonhomework::results{"resource.$id.tries"} =
		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
	    if (&Apache::lonhomework::hide_problem_status()
		|| $Apache::lonhomework::scantronmode) {
		$Apache::lonhomework::results{"resource.$id.awarded"} = 0;
	    }
	    $Apache::lonhomework::results{"resource.$id.solved"} =
		'incorrect_attempted';
	} elsif ( $award eq 'SUBMITTED' ) {
	    $Apache::lonhomework::results{"resource.$id.tries"} =
		$Apache::lonhomework::history{"resource.$id.tries"} + 1;
	    $Apache::lonhomework::results{"resource.$id.solved"} =
		'ungraded_attempted';
	} elsif ( $award eq 'DRAFT' ) {
	    $Apache::lonhomework::results{"resource.$id.solved"} = '';
	} elsif ( $award eq 'NO_RESPONSE' ) {
	    #no real response so delete any data that got stored
	    &removealldata($id);
	    return '';
	} else {
	    $Apache::lonhomework::results{"resource.$id.solved"} =
		'incorrect_attempted';
	    if (&Apache::lonhomework::show_no_problem_status()
		|| $Apache::lonhomework::scantronmode) {
		$Apache::lonhomework::results{"resource.$id.tries"} =
		    $Apache::lonhomework::history{"resource.$id.tries"} + 1;
		$Apache::lonhomework::results{"resource.$id.awarded"} = 0;
	    }

	    if (&Apache::lonhomework::show_some_problem_status()) {
		# clear out the awarded if they had gotten it wrong/right
		# and are now in an error mode	
		$Apache::lonhomework::results{"resource.$id.awarded"} = '';
	    }
	}
	if (defined($msg)) {
	    $Apache::lonhomework::results{"resource.$id.awardmsg"} = $msg;
	}
	# did either of the overall awards chage? If so ignore the 
	# previous check
	if (($Apache::lonhomework::results{"resource.$id.awarded"} eq
	     $Apache::lonhomework::history{"resource.$id.awarded"}) &&
	    ($Apache::lonhomework::results{"resource.$id.solved"} eq
	     $Apache::lonhomework::history{"resource.$id.solved"})) {
	    # check if this was a previous submission if it was delete the
	    # unneeded data and update the previously_used attribute
	    if ( $previously_used eq 'PREVIOUSLY_USED') {
		if (&Apache::lonhomework::show_problem_status()) {
		    delete($Apache::lonhomework::results{"resource.$id.tries"});
		    $Apache::lonhomework::results{"resource.$id.previous"} = '1';
		}
	    } elsif ( $previously_used eq 'PREVIOUSLY_LAST') {
		#delete all data as they student didn't do anything, but save
		#the list of collaborators.
		&removealldata($id);
		#and since they didn't do anything we were never here
		return '';
	    } else {
		$Apache::lonhomework::results{"resource.$id.previous"} = '0';
	    }
	}
    } elsif ( $Apache::lonhomework::history{"resource.$id.solved"} =~
	      /^correct/ ) {
	#delete all data as they student already has it correct
	&removealldata($id);
	#and since they didn't do anything we were never here
	return '';
    }
    $Apache::lonhomework::results{"resource.$id.award"} = $award;
    if ($award eq 'SUBMITTED') {
	&Apache::response::add_to_gradingqueue();
    }
}

sub find_which_previous {
    my ($version) = @_;
    my $part = $Apache::inputtags::part;
    my (@previous_version);
    foreach my $resp (@Apache::inputtags::response) {
	my $key = "$version:resource.$part.$resp.submission";
	my $submission = $Apache::lonhomework::history{$key};
	my %previous = &Apache::response::check_for_previous($submission,
							     $part,$resp,
							     $version);
	push(@previous_version,$previous{'version'});
    }
    return &previous_match(\@previous_version,
			   scalar(@Apache::inputtags::response));
}

sub previous_match {
    my ($previous_array,$count) = @_;
    my $match = 0;
    my @matches;
    foreach my $versionar (@$previous_array) {
	foreach my $version (@$versionar) {
	    $matches[$version]++;
	}
    }
    my $which=0;
    foreach my $elem (@matches) {
	if ($elem eq $count) {
	    $match=1;
	    last;
	}
	$which++;
    }
    return ($match,$which);
}

sub grade {
    my ($target) = @_;
    my $id = $Apache::inputtags::part;
    my $response='';
    if ( defined $env{'form.submitted'}) {
	my (@awards,@msgs);
	foreach $response (@Apache::inputtags::response) {
	    &Apache::lonxml::debug("looking for response.$id.$response.awarddetail");
	    my $value=$Apache::lonhomework::results{"resource.$id.$response.awarddetail"};
	    &Apache::lonxml::debug("keeping $value from $response for $id");
	    push (@awards,$value);
	    $value=$Apache::lonhomework::results{"resource.$id.$response.awardmsg"};
	    &Apache::lonxml::debug("got message $value from $response for $id");
	    push (@msgs,$value);
	}
	my ($finalaward,$msg) = 
	    &finalizeawards(\@awards,\@msgs,undef,undef,
			    $Apache::lonhomework::scantronmode);
	my $previously_used;
	if ( $#Apache::inputtags::previous eq $#awards ) {
	    my ($match) =
		&previous_match(\@Apache::inputtags::previous_version,
				scalar(@Apache::inputtags::response));

	    if ($match) {
		$previously_used = 'PREVIOUSLY_LAST';
		foreach my $value (@Apache::inputtags::previous) {
		    if ($value eq 'PREVIOUSLY_USED' ) {
			$previously_used = $value;
			last;
		    }
		}
	    }
	}
	&Apache::lonxml::debug("final award $finalaward, $previously_used, message $msg");
	&setgradedata($finalaward,$msg,$id,$previously_used);
    }
    return '';
}

sub get_grade_messages {
    my ($id,$prefix,$target,$status) = @_;

    my ($message,$latemessage,$trystr,$previousmsg);
    my $showbutton = 1;

    my $award = $Apache::lonhomework::history{"$prefix.award"};
    my $awarded = $Apache::lonhomework::history{"$prefix.awarded"};
    my $solved = $Apache::lonhomework::history{"$prefix.solved"};
    my $previous = $Apache::lonhomework::history{"$prefix.previous"};
    my $awardmsg = $Apache::lonhomework::history{"$prefix.awardmsg"};
    &Apache::lonxml::debug("Found Award |$award|$solved|$awardmsg");
    if ( $award ne '' || $solved ne '' || $status eq 'SHOW_ANSWER') {
	&Apache::lonxml::debug('Getting message');
	($showbutton,my $css_class,$message,$previousmsg) =
	    &decideoutput($award,$awarded,$awardmsg,$solved,$previous,
			  $target);
	if ($target eq 'tex') {
	    $message='\vskip 2 mm '.$message.' ';
	} else {
	    $message="<td class=\"$css_class\">$message</td>";
	    if ($previousmsg) {
		$previousmsg="<td class=\"LC_answer_previous\">$previousmsg</td>";
	    }
	}
    }
    my $tries = $Apache::lonhomework::history{"$prefix.tries"};
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    &Apache::lonxml::debug("got maxtries of :$maxtries:");
    #if tries are set to negative turn off the Tries/Button and messages
    if (defined($maxtries) && $maxtries < 0) { return ''; }
    if ( $tries eq '' ) { $tries = '0'; }
    if ( $maxtries eq '' ) { $maxtries = '2'; } 
    if ( $maxtries eq 'con_lost' ) { $maxtries = '0'; } 
    my $tries_text=&mt('Tries');
    if ( $Apache::lonhomework::type eq 'survey' ||
	 $Apache::lonhomework::parsing_a_task) {
	$tries_text=&mt('Submissions');
    }

    if ($showbutton) {
	if ($target eq 'tex') {
	    if ($env{'request.state'} ne "construct"
		&& $Apache::lonhomework::type ne 'exam'
		&& $env{'form.suppress_tries'} ne 'yes') {
		$trystr = ' {\vskip 1 mm \small \textit{'.$tries_text.'} '.
		    $tries.'/'.$maxtries.'} \vskip 2 mm ';
	    } else {
		$trystr = '\vskip 0 mm ';
	    }
	} else {
	    $trystr = "<td><nobr>".$tries_text." $tries";
	    if ($Apache::lonhomework::parsing_a_task) {
	    } elsif($env{'request.state'} ne 'construct') {
		$trystr.="/$maxtries";
	    } else {
		if (defined($Apache::inputtags::params{'maxtries'})) {
		    $trystr.="/".$Apache::inputtags::params{'maxtries'};
		}
	    }
	    $trystr.="</nobr></td>";
	}
    }

    if ($Apache::lonhomework::history{"$prefix.afterduedate"}) {
	#last submissions was after due date
	$latemessage=&mt(' The last submission was after the Due Date ');;
	if ($target eq 'web') {
	    $latemessage='<td class="LC_answer_late">'.$latemessage.'</td>';
	}
    }
    return ($previousmsg,$latemessage,$message,$trystr,$showbutton);
}

sub gradestatus {
    my ($id,$target,$no_previous) = @_;
    my $showbutton = 1;
    my $message = '';
    my $latemessage = '';
    my $trystr='';
    my $button='';
    my $previousmsg='';

    my $status = $Apache::inputtags::status['-1'];
    &Apache::lonxml::debug("gradestatus has :$status:");
    if ( $status ne 'CLOSED' 
	 && $status ne 'UNAVAILABLE' 
	 && $status ne 'INVALID_ACCESS' 
	 && $status ne 'NEEDS_CHECKIN' 
	 && $status ne 'NOT_IN_A_SLOT') {  

	($previousmsg,$latemessage,$message,$trystr) =
	    &get_grade_messages($id,"resource.$id",$target,$status,
				$showbutton);
	if ( $status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
	    $showbutton = 0;
	}
	if ( $status eq 'SHOW_ANSWER') {
	    undef($previousmsg);
	}
	if ( $showbutton ) { 
	    if ($target ne 'tex') {
		$button = 
		    '<input 
                          onmouseup="javascript:setSubmittedPart(\''.$id.'\')"
                           onsubmit="javascript:setSubmittedPart(\''.$id.'\')"
                        type="submit" name="submit_'.$id.'"
                         value="'.&mt('Submit Answer').'" />';
	    }
	}

    }
    my $output= $previousmsg.$latemessage.$message.$trystr;
    if ($output =~ /^\s*$/) {
	return $button;
    } else {
	if ($target eq 'tex') {
	    return $button.' \vskip 0 mm '.$output.' ';
	} else {
	    $output =
		'<table><tr><td>'.$button.'</td>'.$output;
	    if (!$no_previous) {
		$output.='<td>'.&previous_tries($id,$target).'</td>';
	    }
	    $output.= '</tr></table>';
	    return $output;
	}
    }
}

sub previous_tries {
    my ($id,$target) = @_;
    my $output;
    my $status = $Apache::inputtags::status['-1'];

    my $count;
    my %count_lookup;

    foreach my $i (1..$Apache::lonhomework::history{'version'}) {
	my $prefix = $i.":resource.$id";

	next if (!exists($Apache::lonhomework::history{"$prefix.award"}));
	$count++;
	$count_lookup{$i} = $count;
	
	my ($previousmsg,$latemessage,$message,$trystr);

	($previousmsg,$latemessage,$message,$trystr) =
	    &get_grade_messages($id,"$prefix",$target,$status);

	if ($previousmsg ne '') {
	    my ($match,$which) = &find_which_previous($i);
	    $message=$previousmsg;
	    my $previous = $count_lookup{$which};
	    $message =~ s{(</td>)}{ as submission \# $previous $1};
	} elsif ($Apache::lonhomework::history{"$prefix.tries"}) {
	    if (!(&Apache::lonhomework::hide_problem_status()
		  && $Apache::inputtags::status[-1] ne 'SHOW_ANSWER')
		&& $Apache::lonhomework::history{"$prefix.solved"} =~/^correct/
		) {
		
                my $txt_correct = &mt('Correct');
		$message =~ s{(<td.*?>)(.*?)(</td>)}
                             {$1 <strong>$txt_correct</strong>. $3}s;
	    }
            my $trystr = "(".&mt('Try [_1]',$Apache::lonhomework::history{"$prefix.tries"}).")";
	    $message =~ s{(</td>)}{ $trystr $1};
	}
	my ($class) = ($message =~ m{<td.*class="([^"]*)"}); #"
	$message =~ s{(<td.*?>)}{<td>};
	

	$output.='<tr class="'.$class.'">';
	$output.='<td align="center">'.$count.'</td>';
	$output.=$message;

	foreach my $resid (@Apache::inputtags::response) {
	    my $prefix = $prefix.".$resid";
	    if (exists($Apache::lonhomework::history{"$prefix.submission"})) {
		my $submission =
		    $Apache::inputtags::submission_display{"$prefix.submission"};
		if (!defined($submission)) {
		    $submission = 
			$Apache::lonhomework::history{"$prefix.submission"};
		}
		$output.='<td>'.$submission.'</td>';
	    } else {
		$output.='<td></td>';
	    }
	}
	$output.=&Apache::loncommon::end_data_table_row()."\n";
    }
    return if ($output eq '');
    my $headers = 
	'<tr>'.'<th>'.&mt('Submission #').'</th><th>'.&mt('Try').
	'</th><th colspan="'.scalar(@Apache::inputtags::response).'">'.
	&mt('Submitted Answer').'</th>';
    $output ='<table class="LC_prior_tries">'.$headers.$output.'</table>';
    #return $output;
    $output = &Apache::loncommon::js_ready($output); 
    $output.='<br /><form action=""><center><input type="button" name="close" value="'.&mt('Close Window').'" onClick="window.close()" /></center></form>';

    my $windowopen=&Apache::lonhtmlcommon::javascript_docopen();
    my $start_page =
	&Apache::loncommon::start_page('Previous Tries', undef,
				       {'only_body'      => 1,
					'bgcolor'        => '#FFFFFF',
					'js_ready'       => 1,
				        'inherit_jsmath' => 1, });
    my $end_page =
	&Apache::loncommon::end_page({'js_ready' => 1,});
    my $prefix = $env{'form.request.prefix'};
    $prefix =~ tr{.}{_};
    my $function_name = "LONCAPA_previous_tries_".$prefix.
	$Apache::lonxml::curdepth.'_'.$env{'form.counter'};
    my $result ="<script type=\"text/javascript\">
// <![CDATA[
    function $function_name() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('$start_page $output $end_page');newWindow.document.close();newWindow.focus()}
// ]]>
</script><a href=\"javascript:$function_name();void(0);\">".&mt("Previous Tries")."</a><br />";
    #use Data::Dumper;
    #&Apache::lonnet::logthis(&Dumper(\%Apache::inputtags::submission_display));
    return $result;
}

1;
__END__