# The LearningOnline Network with CAPA
# The LON-CAPA Grading handler
#
# $Id: grades.pm,v 1.33 2002/06/27 21:34:18 ng 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/
#
# 2/9,2/13 Guy Albertelli
# 6/8 Gerd Kortemeyer
# 7/26 H.K. Ng
# 8/20 Gerd Kortemeyer
# Year 2002
# June 2002 H.K. Ng
#

package Apache::grades;
use strict;
use Apache::style;
use Apache::lonxml;
use Apache::lonnet;
use Apache::loncommon;
use Apache::lonhomework;
use Apache::Constants qw(:common);

sub moreinfo {
  my ($request,$reason) = @_;
  $request->print("Unable to process request: $reason");
  if ( $Apache::grades::viewgrades eq 'F' ) {
    $request->print('<form action="/adm/grades" method="post">'."\n");
    if ($ENV{'form.url'}) {
      $request->print('<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />'."\n");
    }
    if ($ENV{'form.symb'}) {
      $request->print('<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />'."\n");
    }
    $request->print('<input type="hidden" name="command" value="'.$ENV{'form.command'}.'" />'."\n");
    $request->print("Student:".'<input type="text" name="student" value="'.$ENV{'form.student'}.'" />'."<br />\n");
    $request->print("Domain:".'<input type="text" name="domain" value="'.$ENV{'user.domain'}.'" />'."<br />\n");
    $request->print('<input type="submit" name="submit" value="ReSubmit" />'."<br />\n");
    $request->print('</form>');
  }
  return '';
}

sub verifyreceipt {
    my $request=shift;
    my $courseid=$ENV{'request.course.id'};
    my $cdom=$ENV{"course.$courseid.domain"};
    my $cnum=$ENV{"course.$courseid.num"};
    my $receipt=unpack("%32C*",$Apache::lonnet::perlvar{'lonHostID'}).'-'.
                $ENV{'form.receipt'};
    $receipt=~s/[^\-\d]//g;
    my $symb=$ENV{'form.symb'};
    unless ($symb) {
	$symb=&Apache::lonnet::symbread($ENV{'form.url'});
    }
    if ((&Apache::lonnet::allowed('mgr',$courseid)) && ($symb)) {
        $request->print('<h1>Verifying Submission Receipt '.$receipt.'</h1>');
        my $matches=0;
        my (%classlist) = &getclasslist($cdom,$cnum,'0');
        foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
            my ($uname,$udom)=split(/\:/,$student);
            if ($receipt eq 
             &Apache::lonnet::ireceipt($uname,$udom,$courseid,$symb)) {
               $request->print('Matching '.$student.'<br>');
               $matches++;
	   }
        }
        $request->printf('<p>'.$matches." match%s</p>",$matches <= 1 ? '' : 'es');
# needs to print who is matched
    }
    return '';
}

sub receiptInput {
  my ($request) = shift;
  my $cdom=$ENV{"course.$ENV{'request.course.id'}.domain"};
  my $cnum=$ENV{"course.$ENV{'request.course.id'}.num"};
  my $hostver=unpack("%32C*",$Apache::lonnet::perlvar{'lonHostID'});
  $request->print(<<ENDHEADER);
<h2><font color="#339933">Verify a Submission Receipt Issued by this Server</font></h2>
<form action="/adm/grades" method="post">
<tt>$hostver-<input type="text" name="receipt" size="4"></tt>
<input type="submit" name="submit" value="Verify">
<input type="hidden" name="command" value="verify">
ENDHEADER
	  if ($ENV{'form.url'}) {
	    $request->print(
    '<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />');
	  }
	  if ($ENV{'form.symb'}) {
	    $request->print(
    '<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />');
	  }
#  $request->print(<<ENDTABLEST);
  $request->print('</form>');
    return '';
}

sub student_gradeStatus {
  my ($url,$udom,$uname) = @_;
  my $symb=($ENV{'form.symb'} ne '' ? $ENV{'form.symb'} : (&Apache::lonnet::symbread($url)));
  my %record= &Apache::lonnet::restore($symb,$ENV{'request.course.id'},$udom,$uname);
  foreach my $part (&getpartlist($url)) {
    my ($temp,$part,$type)=split(/_/,$part);
    if ($type eq 'solved') {
      my ($status,$foo)=split(/_/,$record{"resource.$part.$type"},2);
      $status = 'nothing' if ($status eq '');
      return $type,$status;
    }
  }
  return '';
}

sub listStudents {
  my ($request) = shift;
  my $cdom=$ENV{"course.$ENV{'request.course.id'}.domain"};
  my $cnum=$ENV{"course.$ENV{'request.course.id'}.num"};

  $request->print(<<ENDTABLEST);
<h2><font color="#339933">Show Student Submissions on Assessment</font></h2>

<table border="0"><tr><td bgcolor="#777777">
<table border="0">
<tr bgcolor="#e6ffff"><td colspan="7"><b>Resource: </b> $ENV{'form.url'}</td></tr>
<tr bgcolor="#e6ffff"><td><b>Username</b></td><td><b>Name</b></td><td><b>Domain</b></td>
<td><b>View Problem</b></td><td><b>Submissions</b></td>
<td><b>Grade Status</b></td><td><b>Action</b></td></tr>
ENDTABLEST
  my (%classlist) = &getclasslist($cdom,$cnum,'0');
  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
      my ($sname,$sdom) = split(/:/,$student);

      my %name=&Apache::lonnet::get('environment', ['lastname','generation',
						    'firstname','middlename'],
				    $sdom,$sname);
      my $fullname;
      my ($tmp) = keys(%name);
      if ($tmp !~ /^(con_lost|error|no_such_host)/i) {
	$fullname=$name{'lastname'}.$name{'generation'};
	if ($fullname =~ /[^\s]+/) { $fullname.=', '; }
	$fullname.=$name{'firstname'}.' '.$name{'middlename'};
      }
      if ( $Apache::grades::viewgrades eq 'F' ) {
	  $request->print("\n".'<tr bgcolor=#ffffe6>'."<td>$sname</td><td>$fullname</td><td align=\"middle\">$sdom</td>".
			  '<form action="/adm/grades" method="post">');
	  if ($ENV{'form.url'}) {
	    $request->print(
			    '<input type="hidden" name="url" value="'.$ENV{'form.url'}.'" />');
	  }
	  if ($ENV{'form.symb'}) {
	    $request->print(
			    '<input type="hidden" name="symb" value="'.$ENV{'form.symb'}.'" />');
	  }
	  $request->print(
			  '<input type="hidden" name="command" value="'.$ENV{'form.command'}.'" />');
	  $request->print(
			  '<input type="hidden" name="student" value="'.$sname.'" />');
	  $request->print(
			  '<input type="hidden" name="fullname" value="'.$fullname.'" />');
	  $request->print(
			  '<input type="hidden" name="domain" value="'.$sdom.'" />');
	  $request->print('<td>'.
			  '<input type="radio" name="vProb" value="no" checked> no '.
			  '<input type="radio" name="vProb" value="yes"> yes </td>');
	  $request->print('<td>'.
			  '<input type="radio" name="lastSub" value="last" checked> last '.
			  '<input type="radio" name="lastSub" value="all"> all </td>');
	  my ($type,$status) = &student_gradeStatus($ENV{'form.url'},$cdom,$sname);
	  $request->print(
			  '<td align="middle">'.$status.'&nbsp;</td>');
	  $request->print(
                         '<td><input type="submit" name="submit" value="View/Grade" />');
	  $request->print('</td></tr></form>');
#	  $request->print('</form></td></tr>');
      }
  }
  $request->print('</table></td></tr></table>');
}


#FIXME - needs to handle multiple matches
sub finduser {
  my ($name) = @_;
  my $domain = '';

  if ( $Apache::grades::viewgrades eq 'F' ) {
    #get classlist
    my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
    #print "Found $cdom:$cnum<br />";
    my (%classlist) = &getclasslist($cdom,$cnum,'0');
    foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
      my ($posname,$posdomain) = split(/:/,$student);
      if ($posname =~ $name) { $name=$posname; $domain=$posdomain; last; }
    }
    return ($name,$domain);
  } else {
    return ($ENV{'user.name'},$ENV{'user.domain'});
  }
}

sub getclasslist {
  my ($coursedomain,$coursenum,$hideexpired) = @_;
  my %classlist=&Apache::lonnet::dump('classlist',$coursedomain,$coursenum);
  my $now = time;
  foreach my $student (keys(%classlist)) {
    my ($end,$start)=split(/:/,$classlist{$student});
    # still a student?
    if (($hideexpired) && ($end) && ($end < $now)) {
      #print "Skipping:$name:$end:$now<br />\n";
      next;
    }
    #print "record=$record<br>";
    push( @{ $classlist{'allids'} }, $student);
  }
  return (%classlist);
}

sub getpartlist {
  my ($url) = @_;
  my @parts =();
  my (@metakeys) = split(/,/,&Apache::lonnet::metadata($url,'keys'));
  foreach my $key (@metakeys) {
    if ( $key =~ m/stores_([0-9]+)_.*/) {
      push(@parts,$key);
    }
  }
  return @parts;
}

sub viewstudentgrade {
  my ($url,$symb,$courseid,$student,@parts) = @_;
  my $result ='';
  my $cellclr = '"#ffffdd"';
  my ($username,$domain) = split(/:/,$student);

  my (@requests) = ('lastname','firstname','middlename','generation');
  my (%name) = &Apache::lonnet::get('environment',\@requests,$domain,$username);
  my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$username);

  my $fullname=$name{'lastname'}.$name{'generation'};
  if ($fullname =~ /[^\s]+/) { $fullname.=', '; }
  $fullname.=$name{'firstname'}.' '.$name{'middlename'};

  $result.="<tr bgcolor=$cellclr><td>$username</td><td>$fullname</td><td align=\"middle\">$domain</td>\n";
  foreach my $part (@parts) {
    my ($temp,$part,$type)=split(/_/,$part);
    my $score=$record{"resource.$part.$type"};
    if ($type eq 'awarded' || $type eq 'tries') {
      $result.='<td align="middle"><input type="text" name="GRADE.'.$student.'.'.$part.'.'.$type.
	  '" value="'.$score.'" size="4" /></td>'."\n";
    } elsif ($type eq 'solved') {
      my ($status,$foo)=split(/_/,$score,2);
      $result.="<td align=\"middle\"><select name=\"GRADE.$student.$part.$type\">\n";
      my $optsel = '<option>correct</option><option>incorrect</option><option>excused</option>'.
	  '<option>ungraded</option><option>partial</option><option>nothing</option>'."\n";
      $status = 'nothing' if ($status eq '');
      $optsel =~ s/<option>$status/<option selected="on">$status/;
      $result.=$optsel;
      $result.="</select></td>\n";
    }
  }
  $result.='<td></td></tr>';
  return $result;
}

#FIXME need to look at the metadata <stores> spec on what type of data to accept and provide an
#interface based on that, also do that to above function.
sub setstudentgrade {
  my ($url,$symb,$courseid,$student,@parts) = @_;

  my $result ='';
  my ($stuname,$domain) = split(/:/,$student);
  my %record=&Apache::lonnet::restore($symb,$courseid,$domain,$stuname);
  my %newrecord;

  foreach my $part (@parts) {
    my ($temp,$part,$type)=split(/_/,$part);
    my $oldscore=$record{"resource.$part.$type"};
    my $newscore=$ENV{"form.GRADE.$student.$part.$type"};
    print "old=$oldscore:new=$newscore:<br>";
    if ($type eq 'solved') {
      my $update=0;
      if ($newscore eq 'nothing' ) {
	if ($oldscore ne '') {
	  $update=1;
	  $newscore = '';
	}
      } elsif ($oldscore !~ m/^$newscore/) {
	$update=1;
	$result.="Updating $stuname to $newscore<br />\n";
	if ($newscore eq 'correct') { $newscore = 'correct_by_override'; }
	if ($newscore eq 'incorrect') { $newscore = 'incorrect_by_override'; }
	if ($newscore eq 'excused') { $newscore = 'excused'; }
	if ($newscore eq 'ungraded') { $newscore = 'ungraded_attempted'; }
      } else {
	#$result.="$stuname:$part:$type:unchanged  $oldscore to $newscore:<br />\n";
      }
      if ($update) { $newrecord{"resource.$part.$type"}=$newscore; }
    } else {
      if ($oldscore ne $newscore) {
	$newrecord{"resource.$part.$type"}=$newscore;
	$result.="Updating $student"."'s status for $part.$type to $newscore<br />\n";
      } else {
	#$result.="$stuname:$part:$type:unchanged  $oldscore to $newscore:<br />\n";
      }
    }
  }
  if ( scalar(keys(%newrecord)) > 0 ) {
    $newrecord{'resource.regrader'}="$ENV{'user.name'}:$ENV{'user.domain'}";
    print "grader=$newrecord{'resource.regrader'}:<br>records<br>";
    while (my ($k,$v) = each %newrecord) {
	print "k=$k:v=$v:<br>\n";
    }
    &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$stuname);

    $result.="Stored away ".scalar(keys(%newrecord))." elements.<br />\n";
  }
  return $result;
}

#
# --------------------------- show submissions of a student, option to grade --------
sub submission {
  my ($request) = @_;

  $request->print(<<JAVASCRIPT);
<script type="text/javascript" language="javascript">
  function updateRadio(radioButton,formtextbox,formsel,wgt) {
     var pts = formtextbox.value;
     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) {
	      formtextbox.value = i;
	      resetbox = true;
	   }
	}
	if (!resetbox) {
	   formtextbox.value = "";
	}
	return;
    }

    for (var i=0; i<radioButton.length; i++) {
	radioButton[i].checked=false;
	if (pts == i) {
	   radioButton[i].checked=true;
	}
    }
    updateSelect(formsel,pts,wgt);
  }

  function writeBox(formrad,formsel,pts,wgt) {
    formrad.value = pts;
    updateSelect(formsel,pts,wgt);
    return;
  }

  function updateSelect(formsel,pts,wgt) {
    if (pts == 0) {
      formsel[1].selected = true;
    }
    if (pts > 0 && pts < wgt) {
      formsel[4].selected = true;
    }
    if (pts == wgt) {
      formsel[0].selected = true;
    }
    return;
  }

</script>
JAVASCRIPT
  (my $url=$ENV{'form.url'})=~s-^http://($ENV{'SERVER_NAME'}|$ENV{'HTTP_HOST'})--;
  if ($ENV{'form.student'} eq '') { &moreinfo($request,"Need student login id"); return ''; }
  print "formstu=$ENV{'form.student'}:<br>";
  my ($uname,$udom) = &finduser($ENV{'form.student'});
  if ($uname eq '') { &moreinfo($request,"Unable to find student"); return ''; }

  my $symb=($ENV{'form.symb'} ne '' ? $ENV{'form.symb'} : (&Apache::lonnet::symbread($url)));
  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$url:."); return ''; }
#
# header info
  my $result='<h2><font color="#339933">Submission Record</font></h2>';
  $result.='<table border="0"><tr><td><b>Username: </b>'.$uname.
      '</td><td><b>Fullname: </b>'.$ENV{'form.fullname'}.'</td><td><b>Domain: </b>'.$udom.'</td></tr>';
  $result.='<tr><td colspan=3><b>Resource: </b>'.$url.'</td></tr></table>';
#
# option to display problem
  if ($ENV{'form.vProb'} eq 'yes') {
      my $rendered=&Apache::loncommon::get_student_view($symb,$uname,$udom,
						   $ENV{'request.course.id'});
      my $companswer=&Apache::loncommon::get_student_answers($symb,$uname,$udom,
							 $ENV{'request.course.id'});
      $result.='<table border="0" width="100%"><tr><td bgcolor="#777777">';
      $result.='<table border="0" width="100%"><tr><td bgcolor="#e6ffff">';
      $result.='<b>Student\'s view of the problem</b></td></tr><tr><td bgcolor="#ffffff">'.$rendered.'<br />';
      $result.='<b>Correct answer:</b><br />'.$companswer;
      $result.='</td></tr></table>';
      $result.='</td></tr></table><br />';
  }
  my $last = ($ENV{'form.lastSub'} eq 'last' ? 'last' : '');
  my $answer=&Apache::loncommon::get_previous_attempt($symb,$uname,$udom,
						      $ENV{'request.course.id'},$last);
  $result.=$answer;

  my $wgt   = &Apache::lonnet::EXT('resource.partid.weight',$symb,$udom,$uname);
  my %record= &Apache::lonnet::restore($symb,$ENV{'request.course.id'},$udom,$uname);
  my $score = $record{'resource.0.awarded'}*$wgt;

  $result.= '<form action="/adm/grades" method="post" name="SCORE">'."\n".
    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
        '<input type="hidden" name="vProb" value="'.$ENV{'form.vProb'}.'" />'."\n".
          '<input type="hidden" name="lastSub" value="'.$last.'" />'."\n".
	    '<input type="hidden" name="command" value="handgrade" />'."\n".
	      '<input type="hidden" name="NCT"'.
	        ' value="'.($ENV{'form.NTSTU'} ne '' ? $ENV{'form.NTSTU'} : '1').'" />'."\n";

  my $counter = 0;
  $result.='<input type="hidden" name="WGT'.$counter.'" value="'.$wgt.'" />'.
      '<input type="hidden" name="unamedom'.$counter.'" value="'.$uname.':'.$udom.'" />'."\n";
  $result.='<table border="0"><tr><td><b>Points</b></td><td>';
  my $ctr = 0;
  while ($ctr<=$wgt) {
      $result.= '<input type="radio" name="RADVAL'.$counter.'" '.
	  'onclick="javascript:writeBox(this.form.GRADE_BOX'.$counter.
	    ',this.form.GRADE_SEL'.$counter.',\''.$ctr.'\',\''.$wgt.'\')" '.
		($score == $ctr? 'checked':'').' /> '.$ctr."\n";
      $ctr++;
  }
  $result.='</td><td>&nbsp;<b>or</b>&nbsp;</td>';
  $result.='<td><input type="text" name="GRADE_BOX'.$counter.'"'.
      ($score ne ''? ' value = "'.$score.'"':'').' size="4" '.
       'onChange="javascript:updateRadio(this.form.RADVAL'.$counter.
        ',this.form.GRADE_BOX'.$counter.
	   ',this.form.GRADE_SEL'.$counter.',\''.$wgt.'\')" /></td>'."\n";
  $result.='<td>/'.($wgt > 0 ? $wgt.' (problem weight)' : '<font color="red">invalid problem weight</font>' ).
      ' </td><td>';

  foreach my $part (&getpartlist($url)) {
    my ($temp,$part,$type)=split(/_/,$part);
    if ($type eq 'solved') {
      my ($status,$foo)=split(/_/,$record{"resource.$part.$type"},2);
      $result.='<select name="GRADE_SEL'.$counter.'">'."\n";
      my $optsel = '<option>correct</option><option>incorrect</option>'.
	  '<option>excused</option><option>ungraded</option>'.
	      '<option>partial</option><option>nothing</option>'."\n";
      $status = 'nothing' if ($status eq '');
      $optsel =~ s/<option>$status/<option selected="on">$status/;
      $result.=$optsel;
      $result.="</select></td></tr>\n";
    }
  }

  $result.='<tr><td colspan="6"><input type="submit" name="gradeOpt" value="Save & Next" />';
  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="on">$nsel/;
  $result.=$ntstu.'student(s) &nbsp;'."\n <br />";
  $result.='<input type="submit" name="gradeOpt" value="Next" />&nbsp';
  $result.='<input type="submit" name="gradeOpt" value="Previous" />&nbsp';
  $result.='(Next and Previous do not save the scores.)';
  $result.='</td><tr></table></form>';
  return $result;
}

sub processHandGrade {
  my ($request) = @_;
  my $result='';

  my $url    = $ENV{'form.url'};
  my $symb   = $ENV{'form.symb'};
  my $button = $ENV{'form.gradeOpt'};
  my $ngrade = $ENV{'form.NCT'};
  my $ntstu  = $ENV{'form.NTSTU'};
  my $vProb  = $ENV{'form.vProb'};
  my $lastSub= $ENV{'form.lastSub'};

  my (@parts) = sort(&getpartlist($url));
  if ($button eq 'Save & Next') {
      my $ctr = 0;
      while ($ctr < $ENV{'form.NCT'}) {
	  my $pts    = ($ENV{'form.GRADE_BOX'.$ctr} ne '' ? $ENV{'form.GRADE_BOX'.$ctr} : $ENV{'form.RADVAL'.$ctr});
	  my $wgt    = $ENV{'form.WGT'.$ctr};
	  my $sel    = $ENV{'form.GRADE_SEL'.$ctr};
	  my $score  = $pts/$wgt if ($wgt != 0);
	  my ($uname,$udom) = split(/:/,$ENV{'form.unamedom'.$ctr});
	  &saveHandGrade($url,$symb,$uname,$udom,$score,@parts);
	  $ctr++;
      }
  }
  my $firststu = $ENV{'form.unamedom0'};
  my $laststu  = $ENV{'form.unamedom'.($ngrade-1)};

  #get classlist
  my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
  my (%classlist) = &getclasslist($cdom,$cnum,'0');

  my (@nextlist,@prevlist);
  my ($nextflg,$prevflg,$ctr) = (0,0,0);
  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
      my ($uname,$udom) = split(/:/,$student);
      if ($nextflg == 1 && $button =~ /Next$/) {
	  push @nextlist,$uname if ($ctr < $ENV{'form.NTSTU'});
	  $ctr++;
      }
      $nextflg = 1 if ($student eq $laststu);
      $prevflg = 1 if ($student eq $firststu);
  }
  foreach my $student (@nextlist) {
      $ENV{'form.student'} = $student;
      $request->print(&submission($request));
  }
  $request->print ("<h2><font color=\"#339933\">Grading</font></h2>");

  #get info for each student
  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
    my $display=&viewstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
      print "ID=$ENV{'request.course.id'}:STU=$student:DIS=$display:<br>\n";
#    $result.=&viewstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
  }

  return 'The End';
#  return $result;
}

sub saveHandGrade {
  my ($url,$symb,$stuname,$domain,$newscore,@parts) = @_;

#  my ($stuname,$domain) = split(/:/,$student);
  my %record=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},$domain,$stuname);
  my %newrecord;

  foreach my $part (@parts) {
    my ($temp,$part,$type)=split(/_/,$part);
    my $oldscore=$record{"resource.$part.$type"};
    if ($type eq 'solved') {
      my $update=0;
      if ($newscore eq 'nothing' ) {
	if ($oldscore ne '') {
	  $update=1;
	  $newscore = '';
	}
      } elsif ($oldscore !~ m/^$newscore/) {
	$update=1;
	if ($newscore eq 'correct')   { $newscore = 'correct_by_override'; }
	if ($newscore eq 'incorrect') { $newscore = 'incorrect_by_override'; }
	if ($newscore eq 'excused')   { $newscore = 'excused'; }
	if ($newscore eq 'ungraded')  { $newscore = 'ungraded_attempted'; }
	if ($newscore eq 'partial')   { $newscore = 'partial_correct'; }
      }
      if ($update) { $newrecord{"resource.$part.$type"}=$newscore; }
    } else {
      if ($oldscore ne $newscore) {
	$newrecord{"resource.$part.$type"}=$newscore;
      }
    }
    if ( scalar(keys(%newrecord)) > 0 ) {
      $newrecord{'resource.regrader'}="$ENV{'user.name'}:$ENV{'user.domain'}";
#      print "grader=$newrecord{'resource.regrader'}:<br>records<br>";
#      while (my ($k,$v) = each %newrecord) {
#	 print "k=$k:v=$v:<br>\n";
#      }
#     &Apache::lonnet::cstore(\%newrecord,$symb,$courseid,$domain,$stuname);
    }
    return '';
  }
}

sub get_symb_and_url {
 my ($request) = @_;
  my $url=$ENV{'form.url'};
  $url=~s-^http://($ENV{'SERVER_NAME'}|$ENV{'HTTP_HOST'})--;
#  my $symb=$ENV{'form.symb'};
#  if (!$symb) { $symb=&Apache::lonnet::symbread($url); }
  my $symb=($ENV{'form.symb'} ne '' ? $ENV{'form.symb'} : (&Apache::lonnet::symbread($url)));
  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$url:."); return ''; }
 return ($symb,$url);
}

sub view_edit_entire_class_form {
  my ($symb,$url)=@_;
  my $result.='<form action="/adm/grades" method="post">'."\n".
    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="viewgrades" />'."\n".
	  '<input type="submit" name="submit" value="View/Grade Entire Class" />'."\n".
	    '</form>'."\n";
  return $result;
}

sub show_grading_menu_form {
  my ($symb,$url)=@_;
  my $result.='<form action="/adm/grades" method="post">'."\n".
    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="gradingmenu" />'."\n".
	  '<input type="submit" name="submit" value="Grading Menu" />'."\n".
	    '</form>'."\n";
  return $result;
}

sub gradingmenu {
  my ($request) = @_;
  my ($symb,$url)=&get_symb_and_url($request);
  if (!$symb) {return '';}

  my $result='<h2>&nbsp;<font color="#339933">Select a Grading Method</font></h2><br />';
  $result.='<table width=100% border=0><tr><td bgcolor=#777777>'."\n";
  $result.='<table width=100% border=0><tr><td bgcolor=#e6ffff>'."\n";
  $result.='&nbsp;<b>Resource :</b> '.$url.'</td></tr>'."\n";
  $result.='<tr bgcolor=#ffffe6><td>'."\n";
  $result.=&view_edit_entire_class_form($symb,$url);
  $result.='<form action="/adm/grades" method="post">'."\n".
     '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="csvupload" />'."\n".
	  '<input type="submit" name="submit" value="Upload Scores" />'."\n".
	    '</form>'."\n";
  $result.='<form action="/adm/grades" method="post">'."\n".
     '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="submission" />'."\n".
	  '<input type="submit" name="submit" value="View/Grade A Student" />'."\n".
	    '</form>'."\n";
  $result.='<form action="/adm/grades" method="post">'."\n".
     '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="receiptInput" />'."\n".
	  '<input type="submit" name="submit" value="Verify Receipt" />'."\n".
	    '</form>'."\n";
  $result.='</td></tr></table>'."\n";
  $result.='</td></tr></table>'."\n";
  return $result;
}

sub viewgrades {
  my ($request) = @_;
  my $result='';

  #get resource reference
  my ($symb,$url)=&get_symb_and_url($request);
  if (!$symb) {return '';}
  #get classlist
  my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
  #print "Found $cdom:$cnum<br />";
  my (%classlist) = &getclasslist($cdom,$cnum,'0');
  my $headerclr = '"#ccffff"';
  my $cellclr = '"#ffffcc"';

  #get list of parts for this problem
  my (@parts) = sort(&getpartlist($url));

  $request->print ("<h2><font color=\"#339933\">Manual Grading</font></h2>");

  #start the form
  $result = '<form action="/adm/grades" method="post">'."\n".
    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="editgrades" />'."\n".
	  '<input type="submit" name="submit" value="Submit Changes" />'."\n".
	    '<table border=0><tr><td bgcolor="#777777">'."\n".
	     '<table border=0>'."\n".
	      '<tr bgcolor='.$headerclr.'><td><b>Username</b></td><td><b>Name</b></td><td><b>Domain</b></td>'."\n";
  foreach my $part (@parts) {
     my $display=&Apache::lonnet::metadata($url,$part.'.display');
     if  (!$display) { $display = &Apache::lonnet::metadata($url,$part.'.name'); }
      print "Manual grading:$url:$part:$display:<br>";
     $result.='<td><b>'.$display.'</b></td>'."\n";
  }
  $result.='</tr>';
  #get info for each student
  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
    my $display=&viewstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
#      print "ID=$ENV{'request.course.id'}:STU=$student:DIS=$display:<br>\n";
    $result.=&viewstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
  }
  $result.='</table></td></tr></table>';
  $result.='<input type="submit" name="submit" value="Submit Changes" /></form>';
  $result.=&show_grading_menu_form($symb,$url);
  return $result;
}

sub editgrades {
  my ($request) = @_;
  my $result='';

  my $symb=$ENV{'form.symb'};
  if ($symb eq '') { $request->print("Unable to handle ambiguous references:$symb:$ENV{'form.url'}"); return ''; }
  my $url=$ENV{'form.url'};
  #get classlist
  my ($cdom,$cnum) = split(/_/,$ENV{'request.course.id'});
  #print "Found $cdom:$cnum<br />";
  my (%classlist) = &getclasslist($cdom,$cnum,'0');

  #get list of parts for this problem
  my (@parts) = &getpartlist($url);

  $result.='<form action="/adm/grades" method="post">'."\n".
    '<input type="hidden" name="symb" value="'.$symb.'" />'."\n".
      '<input type="hidden" name="url" value="'.$url.'" />'."\n".
	'<input type="hidden" name="command" value="viewgrades" />'."\n".
	  '<input type="submit" name="submit" value="See Grades" /> <br />'."\n";

  foreach my $student ( sort(@{ $classlist{'allids'} }) ) {
    $result.=&setstudentgrade($url,$symb,$ENV{'request.course.id'},$student,@parts);
  }

  $result.='<input type="submit" name="submit" value="See Grades" /></table></form>';
  return $result;
}

sub csvupload {
  my ($request)= @_;
  my $result;
  my ($symb,$url)=&get_symb_and_url($request);
  if (!$symb) {return '';}
  my $upfile_select=&Apache::loncommon::upfile_select_html();
  $result.=<<ENDUPFORM;
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<input type="hidden" name="symb" value="$symb" />
<input type="hidden" name="url" value="$url" />
<input type="hidden" name="command" value="csvuploadmap" />
<hr />
<h3>Specify a file containing the class grades for resource $url</h3>
$upfile_select
<p><input type="submit" name="submit" value="Upload Grades" />
ENDUPFORM
  return $result;
}

sub csvupload_javascript_reverse_associate {
  return(<<ENDPICK);
  function verify(vf) {
    var foundsomething=0;
    var founduname=0;
    var founddomain=0;
    for (i=0;i<=vf.nfields.value;i++) {
      tw=eval('vf.f'+i+'.selectedIndex');
      if (i==0 && tw!=0) { founduname=1; }
      if (i==1 && tw!=0) { founddomain=1; }
      if (i!=0 && i!=1 && tw!=0) { foundsomething=1; }
    }
    if (founduname==0 || founddomain==0) {
      alert('You need to specify at both the username and domain');
      return;
    }
    if (foundsomething==0) {
      alert('You need to specify at least one grading field');
      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 {
  return(<<ENDPICK);
  function verify(vf) {
    var foundsomething=0;
    var founduname=0;
    var founddomain=0;
    for (i=0;i<=vf.nfields.value;i++) {
      tw=eval('vf.f'+i+'.selectedIndex');
      if (tw==1) { founduname=1; }
      if (tw==2) { founddomain=1; }
      if (tw>2) { foundsomething=1; }
    }
    if (founduname==0 || founddomain==0) {
      alert('You need to specify at both the username and domain');
      return;
    }
    if (foundsomething==0) {
      alert('You need to specify at least one grading field');
      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,$url,$datatoken,$distotal)= @_;
  my $result;
  my $javascript;
  if ($ENV{'form.upfile_associate'} eq 'reverse') {
    $javascript=&csvupload_javascript_reverse_associate();
  } else {
    $javascript=&csvupload_javascript_forward_associate();
  }
  $request->print(<<ENDPICK);
<form method="post" enctype="multipart/form-data" action="/adm/grades" name="gradesupload">
<h3>Uploading Class Grades for resource $url</h3>
<hr>
<h3>Identify fields</h3>
Total number of records found in file: $distotal <hr />
Enter as many fields as you can. The system will inform you and bring you back
to this page if the data selected is insufficient to run your class.<hr />
<input type="button" value="Reverse Association" onClick="javascript:this.form.associate.value='Reverse Association';submit(this.form);" />
<input type="hidden" name="associate"  value="" />
<input type="hidden" name="phase"      value="three" />
<input type="hidden" name="datatoken"  value="$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="url"        value="$url" />
<input type="hidden" name="command"    value="csvuploadassign" />
<hr />
<script type="text/javascript" language="Javascript">
$javascript
</script>
ENDPICK
  return '';

}

sub csvupload_fields {
  my ($url) = @_;
  my (@parts) = &getpartlist($url);
  my @fields=(['username','Student Username'],['domain','Student Domain']);
  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);
    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 csvuploadmap {
  my ($request)= @_;
  my ($symb,$url)=&get_symb_and_url($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($request);
  }
  my @records=&Apache::loncommon::upfile_record_sep();
  &csvuploadmap_header($request,$symb,$url,$datatoken,$#records+1);
  my $i;
  my $keyfields;
  if (@records) {
    my @fields=&csvupload_fields($url);
    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);
      my %sone=&Apache::loncommon::record_sep($records[0]);
      $keyfields=join(',',sort(keys(%sone)));
    }
  }
  &csvuploadmap_footer($request,$i,$keyfields);
  return '';
}

sub csvuploadassign {
  my ($request)= @_;
  my ($symb,$url)=&get_symb_and_url($request);
  if (!$symb) {return '';}
  &Apache::loncommon::load_tmp_file($request);
  my @gradedata=&Apache::loncommon::upfile_record_sep();
  my @keyfields = split(/\,/,$ENV{'form.keyfields'});
  my %fields=();
  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];
      }
    }
  }
  $request->print('<h3>Assigning Grades</h3>');
  my $courseid=$ENV{'request.course.id'};
  my $cdom=$ENV{"course.$courseid.domain"};
  my $cnum=$ENV{"course.$courseid.num"};
  my (%classlist) = &getclasslist($cdom,$cnum,'1');
  my @skipped;
  my $countdone=0;
  foreach my $grade (@gradedata) {
    my %entries=&Apache::loncommon::record_sep($grade);
    my $username=$entries{$fields{'username'}};
    my $domain=$entries{$fields{'domain'}};
    if (!exists($classlist{"$username:$domain"})) {
      push(@skipped,"$username:$domain");
      next;
    }
    my %grades;
    foreach my $dest (keys(%fields)) {
      if ($dest eq 'username' || $dest eq 'domain') { next; }
      if ($entries{$fields{$dest}} eq '') { next; }
      my $store_key=$dest;
      $store_key=~s/^stores/resource/;
      $store_key=~s/_/\./g;
      $grades{$store_key}=$entries{$fields{$dest}};
    }
    $grades{"resource.regrader"}="$ENV{'user.name'}:$ENV{'user.domain'}";
    &Apache::lonnet::cstore(\%grades,$symb,$ENV{'request.course.id'},
			    $domain,$username);
    $request->print('.');
    $request->rflush();
    $countdone++;
  }
  $request->print("<br />Stored $countdone students\n");
  if (@skipped) {
    $request->print('<br /><font size="+1"><b>Skipped Students</b></font><br />');
    foreach my $student (@skipped) { $request->print("<br />$student"); }
  }
  $request->print(&view_edit_entire_class_form($symb,$url));
  $request->print(&show_grading_menu_form($symb,$url));
  return '';
}

sub send_header {
  my ($request)= @_;
  $request->print(&Apache::lontexconvert::header());
#  $request->print("
#<script>
#remotewindow=open('','homeworkremote');
#remotewindow.close();
#</script>"); 
  $request->print('<body bgcolor="#FFFFFF">');
}

sub send_footer {
  my ($request)= @_;
  $request->print('</body>');
  $request->print(&Apache::lontexconvert::footer());
}

sub handler {
  my $request=$_[0];

  if ($ENV{'browser.mathml'}) {
    $request->content_type('text/xml');
  } else {
    $request->content_type('text/html');
  }
  $request->send_http_header;
  return OK if $request->header_only;
  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'});
  my $url=$ENV{'form.url'};
  my $symb=$ENV{'form.symb'};
  my $command=$ENV{'form.command'};
  if (!$url) {
    my ($temp1,$temp2);
    ($temp1,$temp2,$ENV{'form.url'})=split(/___/,$symb);
    $url = $ENV{'form.url'};
  }
  &send_header($request);
  if ($url eq '' && $symb eq '') {
     if ($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)=split(/\_\_\_/,$tsymb);
                if (&Apache::lonnet::allowed('mgr',$tcrsid)) {
                   $request->print(
                     &Apache::lonnet::ssi('/res/'.$url,
                        ('grade_username' => $tuname,
                         'grade_domain' => $tudom,
                         'grade_courseid' => $tcrsid,
                         'grade_symb' => $tsymb)));
                } else {
                   $request->print('<h1>Not authorized: '.$token.'</h1>');
                }           
	    } else {
                $request->print('<h1>Not a valid DocID: '.$token.'</h1>');
            }
	 } else {
             $request->print(&Apache::lonxml::tokeninputfield());
         }
     }
  } else {
    #&Apache::lonhomework::showhashsubset(\%ENV,'^form');
    $Apache::grades::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
    if ($command eq 'submission') {
      &listStudents($request) if ($ENV{'form.student'} eq '');
      $request->print(&submission($request)) if ($ENV{'form.student'} ne '');
    } elsif ($command eq 'gradingmenu') {
      $request->print(&gradingmenu($request));
    } elsif ($command eq 'viewgrades') {
      $request->print(&viewgrades($request));
    } elsif ($command eq 'handgrade') {
      $request->print(&processHandGrade($request));
    } elsif ($command eq 'editgrades') {
      $request->print(&editgrades($request));
    } elsif ($command eq 'verify') {
      $request->print(&verifyreceipt($request));
    } elsif ($command eq 'csvupload') {
      $request->print(&csvupload($request));
    } elsif ($command eq 'csvuploadmap') {
      $request->print(&csvuploadmap($request));
    } elsif ($command eq 'receiptInput') {
      &receiptInput($request);
    } elsif ($command eq 'csvuploadassign') {
      if ($ENV{'form.associate'} ne 'Reverse Association') {
	$request->print(&csvuploadassign($request));
      } else {
	if ( $ENV{'form.upfile_associate'} ne 'reverse' ) {
	  $ENV{'form.upfile_associate'} = 'reverse';
	} else {
	  $ENV{'form.upfile_associate'} = 'forward';
	}
	$request->print(&csvuploadmap($request));
      }
    } else {
      $request->print("Unknown action: $command:");
    }
  }
  &send_footer($request);
  return OK;
}

1;

__END__;