# The LearningOnline Network with CAPA
# input  definitons
#
# $Id: inputtags.pm,v 1.355 2021/09/07 20:37:33 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/

=pod

=head1 NAME

Apache::inputtags

=head1 SYNOPSIS



This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.


=head1 NOTABLE SUBROUTINES

=over

=item 

=back

=cut

package Apache::inputtags;
use HTML::Entities();
use strict;
use Apache::loncommon;
use Apache::lonhtmlcommon;
use Apache::lonlocal;
use Apache::lonnet;
use LONCAPA;
 

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

=pod

=item initialize_inputtags()

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.

=cut

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=();
}

#
#  provides the onblur binding for spellchecking.  This could be an
#  empty string if spellchecking was not enabled.
#  Jquery selector binding is done rather than setting an onblur
#  attribute because we'll need to set the element's spellcheck language
#  option dynamically so we need $(this) to be defined.
#
# @param id   - The element id to bind.
# @param lang - Language in which spellchecking is desired.
#               if undef, nothing is generated.  
# @return string - onblur specification to do the requested spellchecking.
#
sub spellcheck_onblur {
    my ($id, $lang) = @_;
    my $result = '';
    if ($lang) {

	$result = <<JAVASCRIPT;
<script type="text/javascript">
\$('\#$id').blur(function() {
    doSpellcheck('\#$id', '$lang');
 });
</script>

JAVASCRIPT


    }
    return $result;
}

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 ($oldresponse,$newvariation);
        if ((($Apache::lonhomework::history{"resource.$partid.type"} eq 'randomizetry') ||
             ($Apache::lonhomework::type eq 'randomizetry')) &&
             ($Apache::inputtags::status[-1] eq 'CAN_ANSWER')) {
            if ($env{'form.'.$partid.'.rndseed'} ne
                $Apache::lonhomework::history{"resource.$partid.rndseed"}) {
                $newvariation = 1;
            }
        }
        unless ($newvariation) {
            if ((($env{'form.grade_username'} eq '') && ($env{'form.grade_domain'} eq '')) ||
                (($env{'form.grade_username'} eq $env{'user.name'}) &&
                 ($env{'form.grade_domain'} eq $env{'user.domain'}))) {
                $oldresponse = $Apache::lonhomework::history{"resource.$partid.$resid.submission"};
            } elsif (($Apache::lonhomework::history{"resource.$partid.type"} eq 'anonsurvey') ||
                    ($Apache::lonhomework::history{"resource.$partid.type"} eq 'anonsurveycred')) {
                $oldresponse = '* '.&mt('(only shown to submitter)').' *';
            } else {
                $oldresponse = $Apache::lonhomework::history{"resource.$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='';
	    my $tagident = 'HWVAL_' . $resid;
            my $itemid = 'HWVAL_'.$partid.'_'.$resid;
	    if ($addchars) {
		$result.=&addchars($tagident, $addchars);
	    }
            my $textareaclass;
            unless (&Apache::londefdef::is_inside_of($tagstack,
                                                    'externalresponse')) {
                $textareaclass = 'class="LC_richDetectHtml spellchecked"';
            }
	    $result.= '<textarea wrap="hard" name="'.$tagident.'" id="'.$itemid.'" ' .
		      'rows="'.$rows.'" cols="'.$cols.'" '.$textareaclass
		      .'>'.
                      &HTML::Entities::encode($oldresponse,'<>&"');
	    if ($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') ) {
		$result='<table class="LC_pastsubmission"><tr><td>'.
		    &HTML::Entities::encode($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);
        my $spell_langs = &spelling_languages();
	$result .= &Apache::edit::select_arg('Spellcheck for:', 'spellcheck',
					     $spell_langs, $token);
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'rows','cols',
						     'addchars', 'spellcheck');
	if ($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 \\\\ ';}
	    $result.='\strut \\\\\strut \\\\\strut \\\\\strut \\\\}}}';
	} else {
            if ($env{'form.pdfFormFields'} eq 'yes') {
                my $fieldname = $env{'request.symb'}.
                                '&part_'. $Apache::inputtags::part.
                                '&textresponse'.
                                '&HWVAL_' . $Apache::inputtags::response['-1'];
                $result.='\TextField[name='.$fieldname.',multiline=true,height=6\baselineskip,width=270,borderwidth=0,backgroundcolor={.85 .85 .85}]\\';
            } 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') {
	my $spellcheck = &Apache::lonxml::get_param('spellcheck', $parstack, $safeeval);
	$Apache::lonxml::evaluate++;
	if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
            my $partid=$Apache::inputtags::part;
	    my $resid = $Apache::inputtags::response[-1];
	    my $itemid = 'HWVAL_' . $partid . '_' . $resid;
	    my $result =  "</textarea>";
	    $result .= &spellcheck_onblur($itemid, $spellcheck);
	    return $result;
	}
    } elsif ($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);

    # The spellcheck attribute 
    # 1. enables spellchecking.
    # 2. Provides the language code in which the spellchecking will be performed.

    my $spellcheck = &Apache::lonxml::get_param('spellcheck', $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 ($oldresponse,$newvariation);
            if ((($Apache::lonhomework::history{"resource.$partid.type"} eq 'randomizetry') ||
                 ($Apache::lonhomework::type eq 'randomizetry')) &&
                 ($Apache::inputtags::status[-1] eq 'CAN_ANSWER')) {
                if ($env{'form.'.$partid.'.rndseed'} ne
                    $Apache::lonhomework::history{"resource.$partid.rndseed"}) {
                    $newvariation = 1;
                }
            }
            unless ($newvariation) {
                if ((($env{'form.grade_username'} eq '') && ($env{'form.grade_domain'} eq '')) ||
                    (($env{'form.grade_username'} eq $env{'user.name'}) &&
                     ($env{'form.grade_domain'} eq $env{'user.domain'}))) {
                    $oldresponse = $Apache::lonhomework::history{"resource.$partid.$id.submission"};
                } elsif (($Apache::lonhomework::history{"resource.$partid.type"} eq 'anonsurvey') ||
                        ($Apache::lonhomework::history{"resource.$partid.type"} eq 'anonsurveycred') ||
                        ($Apache::lonhomework::type eq 'anonsurvey') ||
                        ($Apache::lonhomework::type eq 'anonsurveycred')) {
                        $oldresponse = '* '.&mt('(only shown to submitter)').' *';
                } else {
                    $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;
                my $itemid = 'HWVAL_'.$partid.'_'.$id;
                # NOTE: the input id should match the one given by defaut_homework input_id().
                my $input_tag_id = $itemid.'_'.$input_id;
		if ($Apache::inputtags::status[-1] eq 'CANNOT_ANSWER') {
		    $name = "none";
		}
		$result.= '<input onkeydown="javascript:setSubmittedPart(\''.$partid.'\');"'
		     . ' onfocus="javascript:disableAutoComplete(\''.$input_tag_id.'\');"'
		     . ' type="text" '.$readonly.' name="'. $name . '"'
		     . ' id="' . $input_tag_id . '"'
		     . ' value="'.  $oldresponse.'"'
		     . ' class="LC_textline spellchecked"  size="'.$size.'"'.$maxlength.' />';

		$result .= &spellcheck_onblur($itemid, $spellcheck);
                if (($Apache::inputtags::status['-1'] eq 'CAN_ANSWER') &&
                    (($tagstack->[-2] eq 'formularesponse') || ($tagstack->[-2] eq 'mathresponse')) &&
                    (&Apache::lonnet::EXT('resource.'.$partid.'_'.$id.'.turnoffeditor') ne 'yes')) {
                    $result.=&edit_mathresponse_button($input_tag_id);
                }
	    }
	    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);
        my $spell_langs = &spelling_languages();
	$result.=&Apache::edit::select_arg('Spellcheck for:', 'spellcheck',
					   $spell_langs, $token);
	$result.=&Apache::edit::end_row();
	$result.=&Apache::edit::end_table();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'size',
						     'addchars','readonly', 'spellcheck');
	if ($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'
            && $Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
            my $fieldname = $env{'request.symb'}.
                                 '&part_'. $Apache::inputtags::part.
                                 '&textresponse'.
                                 '&HWVAL_' . $Apache::inputtags::response['-1'];
            $result='\textField{'.$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 "";
}


sub start_hiddensubmission {
    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];
            if ($Apache::lonhomework::type ne 'exam') {
                my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
                $value = &HTML::Entities::encode($value,'<>&"');
                $result= '<input type="hidden" name="HWVAL_'.$id.'" value="'.$value.'" />';
            }
        }
    } elsif ($target eq 'edit') {
        $result=&Apache::edit::tag_start($target,$token);
        $result.=&Apache::edit::text_arg('Value:','value',$token,'15');
        $result.=&Apache::edit::end_row();
        $result.=&Apache::edit::end_table();
    } elsif ($target eq 'modified') {
        my $constructtag=&Apache::edit::get_new_args($token,$parstack,
                                                     $safeeval,'value');
        if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }

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

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

=pod

=item file_selector()

$part -> partid
$id -> responseid
$uploadefiletypes -> comma seperated list of extensions allowed or * for any
$which -> 'uploadonly'  -> 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
$maxfilesize -> maximum cumulative filesize for submitted files (in MB).
returns a table row <tr> 

=cut

sub file_selector {
    my ($part,$id,$uploadedfiletypes,$which,$extratext,$maxfilesize)=@_;
    if (!$uploadedfiletypes) { return ''; }

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

    my $result;
    my $current_files_display = &current_file_submissions($part,$id);
    my $addfiles;
    if ($current_files_display) {
        $result .= &Apache::lonhtmlcommon::row_title(&mt('Files currently selected for submission')).
                   $current_files_display.
                   &Apache::lonhtmlcommon::row_closure();
        $addfiles = &mt('Submit other file(s)');
    } else {
        $addfiles = &mt('Choose file(s) to submit');
    }
    $result .= &Apache::lonhtmlcommon::row_title($addfiles);
    my $constraints;
    if ($uploadedfiletypes ne '*') {
	$constraints =
	    &mt('Allowed filetypes: [_1]','<b>'.$uploadedfiletypes.'</b>').'<br />';
    }
    if ($maxfilesize) {
        $constraints .= &mt('Combined size of all files not to exceed: [_1] MB.',
                        '<b>'.$maxfilesize.'</b>').'<br />';
    }
    if ($constraints) {
        $result .= $constraints.'<br />';
    }
    if ($which eq 'uploadonly' || $which eq 'both') {
        my $free_space = $maxfilesize * 1048576;
        $result .= &mt('Submit a file: (only one file per submission)').
            ' <br /><input type="file" size="50" name="HWFILE'.$jspart.'_'.$id.
            '" id="HWFILE'.$jspart.'_'.$id.'" class="LC_flUpload LC_hwkfile" />'.
            '<input type="hidden" id="LC_free_space_'.$jspart.'_'.$id.'"'.
            ' value="'.$free_space.'" /><br />';
    }
    if ( $which eq 'both') {
	$result.='<br />'.'<strong>'.&mt('OR:').'</strong><br />';
    }
    if ($which eq 'portfolioonly' || $which eq 'both') {
        my $symb = $env{'request.symb'};
        (undef,undef,my $res)=&Apache::lonnet::decode_symb($symb);
        my $showsymb;
        # If resource is a .task and URL is unencrypted, include symb in query string
        # for url opened in portfolio file selection window. Can be used to override
        # blocking of portfolio access resulting from an exam event in a different course. 
        if ($res =~ /\.task$/i) {
            my $encsymb = &Apache::lonenc::check_encrypt($symb);
            if ($symb eq $encsymb) {
                $showsymb = $symb;
            }
        }
	$result.=$extratext.'<a href='."'".'javascript:void(window.open("/adm/portfolio?mode=selectfile&amp;fieldname='.$env{'form.request.prefix'}.'HWPORT'.$jspart.'_'.$id.'&amp;symb='.$showsymb.'","cat","height=600,width=800,scrollbars=1,resizable=1,menubar=2,location=1"))'."'".'>'.
	    &mt('Select Portfolio Files: (one or more files per submission)').'</a><br />'.
	    '<input type="text" size="50" name="HWPORT'.$jspart.'_'.$id.'" value="" />'.
	    '<br />';
    }
    $result.=&Apache::lonhtmlcommon::row_closure(1);
    return $result;
}

sub current_file_submissions {
    my ($part,$id) = @_;
    my $jspart=$part;
    $jspart=~s/\./_/g;
    my $uploadedfile=$Apache::lonhomework::history{"resource.$part.$id.uploadedfile"};
    my $portfiles=$Apache::lonhomework::history{"resource.$part.$id.portfiles"};
    return if (($uploadedfile eq '') && ($portfiles !~/[^\s]/));
    my @unversioned;
    foreach my $file (split(/\s*,\s*/,&unescape($portfiles))) {
        my ($path,$name) = ($file =~ m{^(.*/)([^/]+)$});
        my ($origname,$version,$ext) = &Apache::lonnet::file_name_version_ext($name);
        unless ($version) {
            push(@unversioned,$file);
        }    
    }
    return if (!@unversioned);
    my $header = &portpath_popup_js().
                 &Apache::loncommon::start_data_table().
                 &Apache::loncommon::start_data_table_header_row();
    if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
        $header .= '<th>'.&mt('Delete?').'</th>';
    }
    $header .=   '<th>'.&mt('File').'</th>'.
                 '<th>'.&mt('Size (MB)').'</th>'.
                 '<th>'.&mt('Last Modified').'</th>'.
                 &Apache::loncommon::end_data_table_header_row();
    my ($symb,$crsid,$udom,$uname)=&Apache::lonnet::whichuser();
    my ($cdom,$cnum) = ($crsid =~ /^($LONCAPA::match_domain)_($LONCAPA::match_courseid)$/);
    my ($result,$header_shown,%okfiles,%rows,%legacy,@bad_file_list);
    if ($uploadedfile) {
        my $url=$Apache::lonhomework::history{"resource.$part.$id.uploadedurl"};
        my $link = &HTML::Entities::encode($url,'<>&"');
        my ($path,$name) = ($url =~ m{^(/uploaded/\Q$udom\E/\Q$uname\E/essayresponse.*/)([^/]+)$});
        my ($status,$hashref,$error) =
            &current_file_info($url,$link,$name,$path);
        if ($status eq 'ok') {
            push(@{$okfiles{$name}},$url);
            $rows{$url} = $hashref;
            $legacy{$url} = 1;
            &Apache::lonxml::extlink($url);
            &Apache::lonnet::allowuploaded('/adm/essayresponse',$url);
        } else {
            push(@bad_file_list,$error);
        }
    }
    if (@unversioned > 0) {
        my $prefix = "/uploaded/$udom/$uname/portfolio";
        foreach my $file (@unversioned) {
            my ($path,$name) = ($file =~ m{^(.*/)([^/]+)$});
            my $url = $prefix.$path.$name;
            my $uploadedfile = &HTML::Entities::encode($url,'<>&"');
            my ($status,$hashref,$error) =
                &current_file_info($url,$uploadedfile,$name,$path);
            if ($status eq 'ok') {
                push(@{$okfiles{$name}},$url);
                $rows{$url} = $hashref;
            } else {
                push(@bad_file_list,$error);
            }
        }
    }
    my $num = 0;
    foreach my $name (sort(keys(%okfiles))) {
        if (ref($okfiles{$name}) eq 'ARRAY') {
            foreach my $url (@{$okfiles{$name}}) {
                if (ref($rows{$url}) eq 'HASH') {
                    my $link = $rows{$url}{link};
                    my $portfile = $rows{$url}{path}.$rows{$url}{name};
                    $portfile = &HTML::Entities::encode($portfile,'<>&"');
                    if ($link) {
                        my $icon=&Apache::loncommon::icon($url);
                        unless ($header_shown) {
                            $result .= $header;
                            $header_shown = 1;
                        }
                        $result.=
                            &Apache::loncommon::start_data_table_row()."\n";
                        if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
                            $result .=
                                 '<td valign="bottom"><input type="checkbox" name="HWFILE'.$jspart.'_'.$id.'_delete"'.
                                 ' value="'.$portfile.'" id="HWFILE'.$jspart.'_'.$id.'_'.$num.'_delete" /></td>'."\n";
                            $num ++;
                        }
                        my $pathid = 'HWFILE'.$jspart.'_'.$id.'_'.$num.'_path';
                        my $pathidtext = $pathid.'text';
                        my ($showname,$showpath);
                        if ($legacy{$url}) {
                            $showname = $name.' '.&mt('not in portfolio');
                        } else {
                            $showname = $name;
                            $showpath = '<br />'. 
                                        '<span id="'.$pathidtext.'" class="LC_cusr_subheading">'.
                                        '<a href="javascript:showPortPath('."'$pathid','$pathidtext'".');" '.
                                        'class="LC_menubuttons_link">'.
                                        &mt('(Show path)').'</a></span>'.
                                        '<div id="'.$pathid.'" class="LC_dccid">'.$rows{$url}{path}.$name.
'</div>';
                        }
                        $result .= 
                            '<td><a href="'.$link.'"><img src="'.$icon.
                            '" border="0" alt="" />'.$showname.'</a>'.$showpath.'</td>'."\n".
                            '<td align="right" valign="bottom">'.$rows{$url}{size}.'</td>'."\n".
                            '<td align="right" valign="bottom">'.$rows{$url}{lastmodified}.'</td>'."\n".
                            &Apache::loncommon::end_data_table_row();
                    }
                }
            }
        }
    }
    if ($header_shown) {
        $result .= &Apache::loncommon::end_data_table();
        if ($Apache::inputtags::status[-1] eq 'CAN_ANSWER') {
            $result .= '<br /><span class="LC_warning">'.
                       &mt('Exclude existing file(s) from grading by checking the "Delete?" checkbox(es) and clicking "Submit Answer"').'</span>';
        }
    }
    if (@bad_file_list) {
        my $bad_files = '<span class="LC_filename">'.
            join('</span>, <span class="LC_filename">',@bad_file_list).
            '</span>';
        $result.='<p class="LC_error">'.
                 &mt("These file(s) don't exist: [_1]",$bad_files).
                 '</p>';
    }
    return $result;
}

sub current_file_info {
    my ($url,$uploadedfile,$name,$path) = @_;
    my ($status,$error,%info);
    my @stat = &Apache::lonnet::stat_file($url);
    if ((@stat) && ($stat[0] ne 'no_such_dir')) {
        my ($lastmod,$size);
        if ($stat[9] =~ /^\d+$/) {
            $lastmod = &Apache::lonlocal::locallocaltime($stat[9]);
        }
        $size = $stat[7]/(1024*1024);
        $size = sprintf("%.3f",$size);
        %info = (
                    link         => $uploadedfile,
                    name         => $name,
                    path         => $path,
                    size         => $size,
                    lastmodified => $lastmod,
                );
        $status = 'ok';
    } else {
        &Apache::lonnet::logthis("bad file is $url");
        my $icon=&Apache::loncommon::icon($url);
        $error = '<a href="'.$url.'"><img src="'.$icon.
                 '" border="0" />'.$uploadedfile.'</a>';
    }
    return ($status,\%info,$error);
}

sub portpath_popup_js {
    my %lt = &Apache::lonlocal::texthash(
                                          show => '(Show path)',
                                          hide => '(Hide)',
                                        );
    return <<"END";
<script type="text/javascript"> 
// <![CDATA[

function showPortPath(id,idtext) {
    document.getElementById(id).style.display='block';
    document.getElementById(id).style.textAlign='left';
    document.getElementById(id).style.textFace='normal';
    if (document.getElementById(idtext)) {
        document.getElementById(idtext).innerHTML ='<a href="javascript:hidePortPath(\\''+id+'\\',\\''+idtext+'\\'); '+
                                                   '"class="LC_menubuttons_link">$lt{'hide'}</a>&nbsp;';
    }
    return;
}

function hidePortPath(id,idtext) {
    if (document.getElementById(id)) {
        document.getElementById(id).style.display='none';
    }
    if (document.getElementById(idtext)) {
        document.getElementById(idtext).innerHTML ='<a href="javascript:showPortPath(\\''+id+'\\',\\''+idtext+'\\');" '+
                                                   'class="LC_menubuttons_link">$lt{'show'}</a>';
    }
    return;
}

// ]]>
</script>

END
}

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

{
    my @awards = ('EXTRA_ANSWER', 'MISSING_ANSWER', 'ERROR', 'NO_RESPONSE',
		  'WRONG_NUMBOXESCHECKED','TOO_LONG',
		  'UNIT_INVALID_INSTRUCTOR', 'UNIT_INVALID_STUDENT',
		  'UNIT_IRRECONCIBLE', 'UNIT_FAIL', 'NO_UNIT',
		  'UNIT_NOTNEEDED', 'WANTED_NUMERIC', 'BAD_FORMULA',  'NOT_FUNCTION', 
                  'WRONG_FORMAT', 'INTERNAL_ERROR',
		  'COMMA_FAIL', 'SIG_FAIL', 'INCORRECT', 'MISORDERED_RANK',
		  'INVALID_FILETYPE', 'EXCESS_FILESIZE', 'FILENAME_INUSE', 
                  'DRAFT', 'SUBMITTED',
                  'SUBMITTED_CREDIT', 'ANONYMOUS', 'ANONYMOUS_CREDIT',
                  '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|SUBMITTED_CREDIT|ANONYMOUS|ANONYMOUS_CREDIT|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 at least one response item is set to include lenient grading
    # and that item is partially correct then overall award reflects
    # that, unless an award for one of the other response items does
    # not fall within the basic awards for correct or incorrect.
    if ($Apache::inputtags::leniency) {
        if (($$awardref[$which] eq 'INCORRECT')
            && (grep { $_ eq 'EXACT_ANS' ||
                       $_ eq 'APPROX_ANS' ||
                       $_ eq 'ASSIGNED_SCORE' } (@$awardref))
            && !((grep { $_ ne 'INCORRECT' &&
                         $_ ne 'EXACT_ANS' &&
                         $_ ne 'APPROX_ANS' &&
                         $_ ne 'ASSIGNED_SCORE' } (@$awardref)))) {
            return ('ASSIGNED_SCORE');
        }
    }

    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,$nocorrect,$tdclass)=@_;

    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',
          'no_charge_warn'  => 'LC_answer_warning',
	  );

    my $part = $Apache::inputtags::part;
    my $tohandgrade = &Apache::lonnet::EXT("resource.$part.handgrade");
    my $handgrade = ('yes' eq lc($tohandgrade)); 
#
# Should "Computer's Answer" be displayed?
# Should not be displayed if still answerable,
# if the problem is handgraded,
# or if the problem does not give a correct answer
#
    
    my $computer = ($handgrade || $nocorrect)? ''
	                       : &mt("Computer's answer now shown above.");
    &Apache::lonxml::debug("handgrade has :$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 ($handgrade || 
            ($env{'request.filename'}=~/\/res\/lib\/templates\/(examupload|DropBox).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>";
                if ($computer) {
                    $message = "$computer $message";
                }
	    }
	    $added_computer_text=1;
	    if ($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 no. is [_1]',
			    (&Apache::lonnet::receipt($Apache::inputtags::part).
			     (($target eq 'web')?&Apache::loncommon::help_open_topic('Receipt'):'')));
		}
	    }
	}
        if ($awarded >= 1) {
            $button=0;
        } elsif (&Apache::lonnet::EXT("resource.$part.retrypartial") !~/^1|on|yes$/i) {
            $button=0;
        } else {
            $button=1;
        }
	$previousmsg='';
    } elsif ($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 {
		$message = "<b>".&mt('You are correct.')."</b>";
                if ($computer) {
                    $message = "$computer $message";
                }
	    }
	    $added_computer_text=1;
	    if  ($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');
        }
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$possible_class{'not_charged_try'};
        }
	$button = 1;
    } elsif ($award eq 'WRONG_NUMBOXESCHECKED') {
        $message = &mt('Number of boxes checked outside permissible range (either too few or too many).');
        if ($target ne 'tex') {
           $message .= &Apache::loncommon::help_open_topic('Wrong_Num_Boxes_Checked');
        }
        $css_class=$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 'FILENAME_INUSE') {
        $message = &mt('You have already uploaded a file with that filename.');
        if ($target eq 'tex') {
            $message.= "\\\\\n";
        } else {
            $message .= '<br />';
        }
        $message .= &mt('Please use a different filename.');
        $css_class=$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 significant figures.");
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$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');} 
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$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');} 
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$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));
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$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')};
        if (&Apache::lonhomework::show_some_problem_status()) {
            $css_class=$possible_class{'no_charge_warn'};
        } else {
            $css_class=$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 'NOT_FUNCTION') {
        $message = &mt("Not a function").'.';
        $css_class=$possible_class{'not_charged_try'};
        $button=1;
    } elsif ($award eq 'WRONG_FORMAT') {
        $message = &mt("Wrong format").'.';
        $css_class=$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 'SUBMITTED_CREDIT') {
        $message = &mt("Your submission has been recorded, and credit awarded.");
        $css_class=$possible_class{'correct'};
        $button=1;
    } elsif ($award eq 'ANONYMOUS') {
        $message = &mt("Your anonymous submission has been recorded.");
        $css_class=$possible_class{'no_grade'};
        $button=1;
    } elsif ($award eq 'ANONYMOUS_CREDIT') {
        $message = &mt("Your anonymous submission has been recorded, and credit awarded.");
        $css_class=$possible_class{'correct'};
        $button=1;
    } elsif ($award eq 'DRAFT') {
	$message = &mt("Copy saved but not submitted.");
	$css_class=$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"}) {
            if ($target eq 'tex') {
                $message.= "\\\\\n";
            } else {
                $message.='<br />';
            }
	    my @files = split(/\s*,\s*/,
			      $Apache::lonhomework::history{"resource.$part.$resid.handback"});
	    my $file_msg;
	    foreach my $file (@files) {
                if ($target eq 'tex') {
                    $file_msg.= "\\\\\n".$file;
                } else {
                    $file_msg.= '<br /><a href="/uploaded/'."$domain/$user".'/'.$file.'">'.$file.'</a>';
                }
	    }
	    $message .= &mt('Returned file(s): [_1]',$file_msg);
            if ($target eq 'tex') {
                $message.= "\\\\\n";
            } else {
                $message.='<br />';
            }
	}
    }

    if (&Apache::lonhomework::hide_problem_status()
	&& $Apache::inputtags::status[-1] ne 'SHOW_ANSWER'
	&& &hide_award($award)) {
        $message = &mt("Answer Submitted: Your final submission will be graded after the due date.");
        my @interval= &Apache::lonnet::EXT("resource.$part.interval");
        if ($interval[0] =~ /\d+/) {
            my $first_access=&Apache::lonnet::get_first_access($interval[1]);
            if (defined($first_access)) {
                my $due_date= &Apache::lonnet::EXT("resource.$part.duedate");
                my ($timelimit) = ($interval[0] =~ /^(\d+)/);
                unless (($due_date) && ($due_date < $first_access + $timelimit)) { 
                    $message = &mt("Answer Submitted: Your final submission will be graded when the time limit is reached.");
                }
            }
        }
	$css_class=$possible_class{'no_grade'};
	$button=1;
        if ($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') {
            if ($Apache::inputtags::status[-1] eq 'CANNOT_ANSWER') {
                $message = 'Answer Submitted';
            } else {
                undef($message); 
            }
        }
    }
    if ($Apache::inputtags::status[-1] eq 'SHOW_ANSWER' && 
	!$added_computer_text && $target ne 'tex') {
        if ($computer) {
            $message = "$computer $message";
        }
	$added_computer_text=1;
    }
    if ($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.awarded"} < 1
	      || $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 'SUBMITTED_CREDIT' ) {
            $Apache::lonhomework::results{"resource.$id.tries"} =
                $Apache::lonhomework::history{"resource.$id.tries"} + 1;
            $Apache::lonhomework::results{"resource.$id.solved"} =
                'credit_attempted';
            $Apache::lonhomework::results{"resource.$id.awarded"} = '1';
        }  elsif ( $award eq 'ANONYMOUS_CREDIT' ) {
            $Apache::lonhomework::results{"resource.$id.tries"} =
                $Apache::lonhomework::history{"resource.$id.tries"} + 1;
            $Apache::lonhomework::results{"resource.$id.solved"} =
                'credit_attempted';
            $Apache::lonhomework::results{"resource.$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 'ANONYMOUS' ) {
            $Apache::lonhomework::results{"resource.$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.awarded"} == 1 ) {
	#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();
    }
    $Apache::lonhomework::results{"resource.$id.type"} = $Apache::lonhomework::type;
    $Apache::lonhomework::results{"resource.$id.duedate"} = &Apache::lonnet::EXT("resource.$id.duedate");
    $Apache::lonhomework::results{"resource.$id.hinttries"} = &Apache::lonnet::EXT("resource.$id.hinttries");
    $Apache::lonhomework::results{"resource.$id.version"} = &Apache::lonnet::usedversion();
    $Apache::lonhomework::results{"resource.$id.maxtries"} = &Apache::lonnet::EXT("resource.$id.maxtries");
}

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,$nocorrect,$tdclass) = @_;
# nocorrect suppresses "Computer's answer now shown above"
    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,
			  $target,(($status eq 'CAN_ANSWER') || $nocorrect),$tdclass);
	if ($target eq 'tex') {
	    $message='\vskip 2 mm '.$message.' ';
	} else {
            if ($message) {
	        $message="<td class=\"$tdclass $css_class\">$message</td>";
            } else {
                $message="<td class=\"$tdclass\"></td>";  
            }
	    if ($previousmsg) {
		$previousmsg="<td class=\"$tdclass 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 $tries_text= &get_tries_text();
    if ($showbutton) {
	if ($target eq 'tex') {
	    if ($env{'request.state'} ne "construct"
		&& $Apache::lonhomework::type ne 'exam'
		&& $env{'form.suppress_tries'} ne 'yes') {
		$trystr ='{\vskip 1 mm \small '
                        .&mt('[_1]'.$tries_text.'[_2] [_3]'
				,'\textit{','}',$tries.'/'.$maxtries ) 
                        .'} \vskip 2 mm';
	    } else {
		$trystr = '\vskip 0 mm ';
	    }
	} else {
	    my $trial =$tries;
	    if ($Apache::lonhomework::parsing_a_task) {
	    } elsif($env{'request.state'} ne 'construct') {
		$trial.="/".&Apache::lonhtmlcommon::direct_parm_link($maxtries,$env{'request.symb'},'maxtries',$id,$target);
	    } else {
		if (defined($Apache::inputtags::params{'maxtries'})) {
		    $trial.="/".$Apache::inputtags::params{'maxtries'};
		}
	    }
            
            unless (($env{'request.state'} ne "construct") && 
                    ($env{'course.'.$env{'request.course.id'}.'.type'} eq 'Placement') && 
                    (!$env{'request.role.adv'})) {
                $trystr = '<span class="LC_nobreak">'.&mt($tries_text.' [_1]',$trial).'</span>';
            }
	    $trystr = '<td class="'.$tdclass.'">'.$trystr.'</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') {
	    $latemessage='<td class="'.$tdclass.' 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 $tdclass='';

    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'
         && $status ne 'RESERVABLE'
         && $status ne 'RESERVABLE_LATER'
         && $status ne 'NOTRESERVABLE'
         && $status ne 'NEED_DIFFERENT_IP') {

	if ($status eq 'SHOW_ANSWER') {
            $showbutton = 0;
        }

        unless (($status eq 'SHOW_ANSWER') || ($status eq 'CANNOT_ANSWER')) {
            if ($target ne 'tex') {
                $tdclass = 'LC_status_submit_'.$id;
            }
        }

	($previousmsg,$latemessage,$message,$trystr) =
	    &get_grade_messages($id,"resource.$id",$target,$status,
				$showbutton,$tdclass);
	if ($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.'\');this.form.action+=\'#'.&escape($id).'\';"
                    type="submit" name="submit_'.$id.'" id="submit_'.$id.'" class="LC_hwk_submit"
                    value="'.&mt('Submit Answer').'" />&nbsp;'.
                    '<div id="msg_submit_'.$id.'" style="display:none">'.
                    &mt('Processing your submission ...').'</div>';
	    }
	}

    }
    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) &&
                (($env{'course.'.$env{'request.course.id'}.'.type'} ne 'Placement') ||
                 ($env{'request.role.adv'}))) {
		$output.='<td class="'.$tdclass.'">'.&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 $count;
    my %count_lookup;
    my ($lastrndseed,$lasttype);
    my $numstamps = 0;

    foreach my $i (1..$Apache::lonhomework::history{'version'}) {
	my $prefix = $i.":resource.$id";
        my $is_anon;
        my $curr_type = $Apache::lonhomework::history{"$prefix.type"};    
        if (defined($env{'form.grade_symb'})) {
            if (($curr_type eq 'anonsurvey') || ($curr_type eq 'anonsurveycred')) {
                $is_anon = 1;
            }
        }
	next if (!exists($Apache::lonhomework::history{"$prefix.award"}));
	$count++;
	$count_lookup{$i} = $count;
        my $curr_rndseed = $Apache::lonhomework::history{"$prefix.rndseed"};
	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');
                my $awarded = $Apache::lonhomework::history{"$prefix.awarded"};
                if ($awarded < 1 && $awarded > 0) {
                    $txt_correct=&mt('Partially Correct');
                } elsif ($awarded < 1) {
                    if ($awarded eq '') {
                        $txt_correct='';
                    } else {
                        $txt_correct=&mt('Incorrect');
                    }
                }
		$message =~ s{(<td.*?>)(.*?)(</td>)}
                             {$1 <strong>$txt_correct</strong>. $3}s;
	    }
            my $trystr = "(".&mt('Try [_1]',$Apache::lonhomework::history{"$prefix.tries"}).")";
            if (($curr_rndseed ne '') &&  ($lastrndseed ne '')) {
                if (($curr_rndseed ne $lastrndseed) && 
                    (($curr_type eq 'randomizetry') || ($lasttype eq 'randomizetry'))) {
                    $trystr .= '<br /><span style="color: green; white-space: nowrap; font-style: italic; font-weight: bold; font-size: 80%;">'.&mt('New problem variation this try.').'</span>';
                }
            } 
	    $message =~ s{(</td>)}{ $trystr $1};
	}
	my ($class) = ($message =~ m{<td.*class="([^"]*)"}); #"
	$message =~ s{(<td.*?>)}{<td>};
	

	$output .= '<tr class="'.$class.'">'.
	           '<td align="center">'.$count.'</td>'.$message;
        if ((!$is_anon) && ($Apache::lonhomework::history{"$prefix.tries"}) &&
            ($Apache::lonhomework::history{"$prefix.award"} ne 'ASSIGNED_SCORE') &&
            ($Apache::lonhomework::history{$i.':timestamp'})) {
            $output .= '<td>'.&Apache::lonlocal::locallocaltime(
                             $Apache::lonhomework::history{$i.':timestamp'}).'</td>';
            $numstamps ++;
        } else {
            $output .= '<td></td>';
        }
	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"};
		}
                if ($is_anon) {
                    $output.='<td>'.&mt('(only shown to submitter)').'</td>';
                } else {
		    $output.='<td>'.$submission.'</td>';
                }
	    } else {
		$output.='<td></td>';
	    }
	}
	$output.=&Apache::loncommon::end_data_table_row()."\n";
        $lastrndseed = $curr_rndseed;
        $lasttype = $curr_type;
    }
    return if ($output eq '');
    my $headers = '<tr>'.
                  '<th>'.&mt('Submission #').'</th>'.
                  '<th>'.&mt('Try').'</th><th>';
    if ($numstamps) {
        $headers .= &mt('When');
    }
    $headers .= '</th>';
    my $colspan = scalar(@Apache::inputtags::response);
    if ($colspan > 1) {
        $headers .= '<th colspan="'.$colspan.'">';
    } else {
        $headers .= '<th>';
    }
    $headers .= &mt('Submitted Answer').'</th></tr>';
    $output ='<table class="LC_prior_tries">'.$headers.$output.'</table>';

    my $tries_text = &get_tries_text('link');
    my $prefix = $env{'form.request.prefix'};
    $prefix =~ tr{.}{_};
    my $function_name = 'LONCAPA_previous_tries_'.$prefix;
    if (($env{'request.state'} eq 'construct') || ($id =~ /\W/)) {
        $function_name .= $Apache::lonxml::curdepth;
    } else {
        $function_name .= $id;
    }
    $function_name .= '_'.$Apache::lonxml::counter;
    my $possmathjax = 1;
    my $result = &Apache::loncommon::modal_adhoc_window($function_name,420,410,$output,
                                                        &mt($tries_text),$possmathjax)."<br />";
    return $result;
}

sub get_tries_text {
    my ($context) = @_;
    my $tries_text;
    if ($context eq 'link') {
        $tries_text = 'Previous Tries';
    } else {
        $tries_text = 'Tries';
    }
    if ( $Apache::lonhomework::type eq 'survey' ||
         $Apache::lonhomework::type eq 'surveycred' ||
         $Apache::lonhomework::type eq 'anonsurvey' ||
         $Apache::lonhomework::type eq 'anonsurveycred' ||
         $Apache::lonhomework::parsing_a_task) {
        if ($context eq 'link') {
            $tries_text = 'Previous Submissions';
        } else {
            $tries_text = 'Submissions';
        }
    }
    return $tries_text;
}

sub spelling_languages {
    my %langchoices;
    foreach my $id (&Apache::loncommon::languageids()) {
        my $code = &Apache::loncommon::supportedlanguagecode($id);
        if ($code ne '') {
            $langchoices{$code} =  &Apache::loncommon::plainlanguagedescription($id);
        }
    }
    my @spelllangs = ('none');
    foreach my $code ('en','de','he','es','fr','pt','tr') {
        push(@spelllangs,[$code,$langchoices{$code}]);
    }
    return \@spelllangs;
}

sub edit_mathresponse_button {
    my ($field) = @_;
    my $eqneditor = 'lcmath';
    if ($env{'browser.type'} eq 'safari') {
        if ($env{'browser.os'} eq 'mac') {
            my ($prefix,$version) = ($env{'browser.version'} =~ /^(\d*)(\d{3})\./);
            if ($env{'browser.mobile'}) {
                if (($version < 531) || (($prefix eq '') && ($version < 533))) {
                    $eqneditor = '';
                }
            } elsif ($version < 533) {
                $eqneditor = 'dragmath';
            }
        } elsif ($env{'browser.os'} eq 'win') {
            if ($env{'browser.version'} < 533) {
                $eqneditor = 'dragmath';
            }
        }
    } elsif ($env{'browser.type'} eq 'explorer') {
        if ($env{'browser.version'} < 9) {
            $eqneditor = 'dragmath';
        }
    } elsif ($env{'browser.type'} eq 'mozilla') {
        if ($env{'browser.version'} < 5) {
            $eqneditor = 'dragmath';
        } else {
            if ($env{'browser.info'} =~ /^firefox\-([\d\.]+)/) {
                my $firefox = $1;
                if ($firefox < 4) {
                    $eqneditor = 'dragmath';
                }
            }
        }
    } elsif ($env{'browser.type'} eq 'chrome') {
        if ($env{'browser.version'} < 5) {
            $eqneditor = 'dragmath';
        }
    } elsif ($env{'browser.type'} eq 'opera') {
        if ($env{'browser.version'} < 12) {
            $eqneditor = 'dragmath';
        }
    }
    if ($eqneditor eq 'lcmath') {
        if (($env{'request.course.id'}) && ($env{'request.state'} ne 'construct')) {
            if (exists($env{'course.'.$env{'request.course.id'}.'.uselcmath'})) {
                if ($env{'course.'.$env{'request.course.id'}.'.uselcmath'} eq '0') {
                    $eqneditor = 'dragmath';
                }
            } else {
                my %domdefs = &Apache::lonnet::get_domain_defaults($env{'course.'.$env{'request.course.id'}.'.domain'});
                if ($domdefs{'uselcmath'} eq '0') {
                    $eqneditor = 'dragmath';
                }
            }
        } else {
            my %domdefs = &Apache::lonnet::get_domain_defaults($env{'course.'.$env{'request.course.id'}.'.domain'});
            if ($domdefs{'uselcmath'} eq '0') {
                $eqneditor = 'dragmath';
            }
        }
    }
    if ($eqneditor eq 'dragmath') {
        # DragMath applet
        my $button=&mt('Edit Answer');
#       my $helplink=&Apache::loncommon::help_open_topic('Formula_Editor');
        my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
        return(<<ENDFORMULABUTTON);
<script type="text/javascript" language="JavaScript">
function LC_mathedit_${field} (LCtextline) {
    thenumber = LCtextline;
    var thedata = '';
    if (document.getElementById(LCtextline)) {
        thedata = document.getElementById(LCtextline).value;
    }
    newwin = window.open("/adm/dragmath/MaximaPopup.html","","width=565,height=400,resizable");
}
</script>
<a href="javascript:LC_mathedit_${field}('${field}');void(0);"><img class="stift" src="$iconpath/stift.gif" alt="$button" title="$button" /></a>
ENDFORMULABUTTON
    } elsif ($eqneditor eq 'lcmath') {
        # LON-CAPA math equation editor
        my $mathjaxjs;
        unless (lc(&Apache::lontexconvert::tex_engine()) eq 'mathjax') {
            $mathjaxjs = <<"MATHJAX_SCRIPT";
var mathjaxscript = document.createElement("script");
    mathjaxscript.type = "text/javascript";
    mathjaxscript.src = "/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML";
    document.body.appendChild(mathjaxscript);
MATHJAX_SCRIPT
        }
        return(<<EQ_EDITOR_SCRIPT);
<script type="text/javascript">
  var LCmathField = document.getElementById('${field}');
  LCmathField.className += ' math'; // note the space
  LCmathField.setAttribute('data-implicit_operators', 'true');
  var LCMATH_started;
  if (typeof LCMATH_started === 'undefined') {
    $mathjaxjs
    LCMATH_started = true;
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = "/adm/LC_math_editor/LC_math_editor.min.js";
    document.body.appendChild(script);
    window.addEventListener('load', function(e) {
        LCMATH.initEditors();
    }, false);
  }
</script>
EQ_EDITOR_SCRIPT
    }
}

1;
__END__

=pod

=back

=cut