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- BUG#4716

# The LearningOnline Network with CAPA
# mutliple choice style responses
#
# $Id: radiobuttonresponse.pm,v 1.106 2006/03/27 21:18:16 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::radiobuttonresponse;
use strict;
use HTML::Entities();
use Apache::lonlocal;
use Apache::lonnet;

BEGIN {
    &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
}

sub start_radiobuttonresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    #when in a radiobutton response use these
    &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
    push (@Apache::lonxml::namespace,'radiobuttonresponse');
    my $id = &Apache::response::start_response($parstack,$safeeval);
    %Apache::hint::radiobutton=();
    undef(%Apache::response::foilnames);
    if ($target eq 'meta') {
	$result=&Apache::response::meta_package_write('radiobuttonresponse');
    } elsif ($target eq 'edit' ) {
	$result.=&Apache::edit::start_table($token).
	    '<tr><td>'.&Apache::lonxml::description($token).
	    &Apache::loncommon::help_open_topic('Radio_Response_Problems').
	    "</td><td>Delete:".
	    &Apache::edit::deletelist($target,$token)
	    ."</td><td>&nbsp".&Apache::edit::end_row()
	    .&Apache::edit::start_spanning_row();
	$result.=
	    &Apache::edit::text_arg('Max Number Of Shown Foils:','max',
				    $token,'4').
	    &Apache::edit::select_arg('Randomize Foil Order','randomize',
				      ['yes','no'],$token).
	    &Apache::edit::select_arg('Display Direction','direction',
				      ['vertical','horizontal'],$token).
				      &Apache::edit::end_row().
				      &Apache::edit::start_spanning_row()."\n";
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'max',
						     'randomize','direction');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    } elsif ($target eq 'tex') {
	my $type=&Apache::lonxml::get_param('TeXtype',$parstack,$safeeval,
					    undef,0);
	if ($type eq '1') {
	    $result .= ' \renewcommand{\labelenumi}{\arabic{enumi}.}';
	} elsif ($type eq 'A') {
	    $result .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}';
	} elsif ($type eq 'a') {
	    $result .= ' \renewcommand{\labelenumi}{\alph{enumi}.}';
	} elsif ($type eq 'i') {
	    $result .= ' \renewcommand{\labelenumi}{\roman{enumi}.}';
	} else {
	    $result .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}';
	}
	$result .= '\begin{enumerate}';
    } elsif ($target eq 'analyze') {
	my $part_id="$Apache::inputtags::part.$id";
	push (@{ $Apache::lonhomework::analyze{"parts"} },$part_id);
    }
    return $result;
}

sub end_radiobuttonresponse {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    if ($target eq 'edit') { $result=&Apache::edit::end_table(); }
    if ($target eq 'tex') { $result .= '\end{enumerate}'; }
    &Apache::response::end_response;
    pop @Apache::lonxml::namespace;
    &Apache::lonxml::deregister('Apache::radiobuttonresponse',('foilgroup','foil','conceptgroup'));
    undef(%Apache::response::foilnames);
    return $result;
}

%Apache::response::foilgroup=();
sub start_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    %Apache::response::foilgroup=();
    $Apache::radiobuttonresponse::conceptgroup=0;
    &Apache::response::pushrandomnumber();
    if ($target eq 'tex' && $Apache::lonhomework::type eq 'exam') {
	$result.='\item[\textbf{'.$Apache::lonxml::counter.'}.]';
    }
    return $result;
}

sub storesurvey {
    if ( !&Apache::response::submitted() ) { return ''; }
    my $response = $env{'form.HWVAL_'.$Apache::inputtags::response['-1']};
    &Apache::lonxml::debug("Here I am!:$response:");
    if ( $response !~ /[0-9]+/) { return ''; }
    my $part = $Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my @whichfoils=@{ $Apache::response::foilgroup{'names'} };
    my %responsehash;
    $responsehash{$whichfoils[$response]}=$response;
    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
	$responsestr;
    my %previous=&Apache::response::check_for_previous($responsestr,$part,$id);
    my $ad=$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}='SUBMITTED';
    &Apache::response::handle_previous(\%previous,$ad);
    &Apache::lonxml::debug("submitted a $response<br />\n");
    return '';
}

sub grade_response {
    my ($max,$randomize)=@_;
    #keep the random numbers the same must always call this
    my ($answer,@whichfoils)=&whichfoils($max,$randomize);
    if ( !&Apache::response::submitted() ) { return; }
    my $response;
    if ($env{'form.submitted'} eq 'scantron') {
	$response=&Apache::response::getresponse();
    } else {
	$response = $env{'form.HWVAL_'.$Apache::inputtags::response['-1']};
    }
    if ( $response !~ /[0-9]+/) { return; }
    my $part=$Apache::inputtags::part;
    my $id = $Apache::inputtags::response['-1'];
    my %responsehash;
    $responsehash{$whichfoils[$response]}=$response;
    my $responsestr=&Apache::lonnet::hash2str(%responsehash);
    my %previous=&Apache::response::check_for_previous($responsestr,
						       $part,$id);
    $Apache::lonhomework::results{"resource.$part.$id.submission"}=
	$responsestr;
    &Apache::lonxml::debug("submitted a $response<br />\n");
    my $ad;
    if ($response == $answer) {
	$ad='EXACT_ANS';
    } else {
	$ad='INCORRECT';
    }
    $Apache::lonhomework::results{"resource.$part.$id.awarddetail"}=$ad;
    &Apache::response::handle_previous(\%previous,$ad);
}

sub end_foilgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;

    my $result;
    if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
	$target eq 'tex' || $target eq 'analyze') {
	my $style = $Apache::lonhomework::type;
	my $direction = &Apache::lonxml::get_param('direction',$parstack,
						   $safeeval,'-2');
	if ( $style eq 'survey'  && $target ne 'analyze') {
	    if ($target eq 'web' || $target eq 'tex') {
		$result=&displayallfoils($direction);
	    } elsif ( $target eq 'answer' ) {
		$result=&displayallanswers();
	    } elsif ( $target eq 'grade' ) {
		$result=&storesurvey();
	    }
	} else {
	    my $name;
	    my $max = &Apache::lonxml::get_param('max',$parstack,$safeeval,
						 '-2');
	    my $randomize = &Apache::lonxml::get_param('randomize',$parstack,
						       $safeeval,'-2');
	    if ($target eq 'web' || $target eq 'tex') {
		$result=&displayfoils($target,$max,$randomize,$direction);
	    } elsif ($target eq 'answer' ) {
		$result=&displayanswers($max,$randomize);
	    } elsif ( $target eq 'grade') {
		&grade_response($max,$randomize);
	    }  elsif ( $target eq 'analyze') {
		my @shown = &whichfoils($max,$randomize);
		&Apache::response::analyze_store_foilgroup(\@shown,
							   ['text','value','location']);
		my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
		push (@{ $Apache::lonhomework::analyze{"$part_id.options"} },
		      ('true','false'));
	    }
	}
    }
    &Apache::response::poprandomnumber();
    &Apache::lonxml::increment_counter();
    return $result;
}

sub getfoilcounts {
    my @names;
    my $truecnt=0;
    my $falsecnt=0;
    my $name;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    foreach $name (@names) {
	if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
	    $truecnt++;
	} elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
	    $falsecnt++;
	}
    }
    return ($truecnt,$falsecnt);
}

sub displayallfoils {
    my ($direction)=@_;
    my $result;
    &Apache::lonxml::debug("survey style display");
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    my $temp=0;
    my $id=$Apache::inputtags::response['-1'];
    my $part=$Apache::inputtags::part;
    my $lastresponse=
	$Apache::lonhomework::history{"resource.$part.$id.submission"};
    if ($direction eq 'horizontal') { $result.='<table><tr>'; }
    my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
    if (&Apache::response::show_answer() ) {
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
		if ($direction eq 'horizontal') {
		    $result.="<td>";
		} else {
		    $result.="<br />";
		}
		if (defined($lastresponse{$name})) {
		    $result.='<b>';
		}
		$result .= $Apache::response::foilgroup{$name.'.text'};
		if (defined($lastresponse{$name})) {
		    $result.='</b>';
		}
		if ($direction eq 'horizontal') { $result.="</td>"; }
	    }
	}
    } else {
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} ne 'unused') {
		if ($direction eq 'horizontal') {
		    $result.="<td>";
		} else {
		    $result.="<br />";
		}
                $result .= '<label>';
		$result.="<input type=\"radio\" name=\"HWVAL_$Apache::inputtags::response['-1']\" value=\"$temp\" ";
		if (defined($lastresponse{$name})) { $result .= 'checked="on"'; }
		$result .= '>'.$Apache::response::foilgroup{$name.'.text'}.
                    '</label>';
		$temp++;
		if ($direction eq 'horizontal') { $result.="</td>"; }
	    }
	}
    }
    if ($direction eq 'horizontal') { $result.='</tr></table>'; }
    return $result;
}

sub whichfoils {
    my ($max,$randomize)=@_;

    my @truelist;
    my @falselist;
    my @whichfalse =();
    my ($truecnt,$falsecnt) = &getfoilcounts();
    my $count=0;
    # we will add in 1 of the true statements
    if ( $max>0 && ($falsecnt+1)>$max) { $count=$max } else { $count=$falsecnt+1; $max=$count; }
    my $answer=int(&Math::Random::random_uniform() * ($count));
    &Apache::lonxml::debug("Count is $count, $answer is $answer");
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
    if (&Apache::response::showallfoils()) {
	@whichfalse=@names;
    } elsif ($randomize eq 'no') {
	&Apache::lonxml::debug("No randomization");
	my $havetrue=0;
	foreach my $name (@names) {
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		if (!$havetrue ) {
		    push(@whichfalse,$name); $havetrue++; $answer=$#whichfalse;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
		push (@whichfalse,$name);
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
	    } else {
		&Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>",'<>&"'));
	    }
	}
	if (!$havetrue && $Apache::lonhomework::type ne 'survey') {
	    &Apache::lonxml::error("There are no true statements available.<br />");
	}
    } else {
	my $current=0;
	&Apache::lonhomework::showhash(%Apache::response::foilgroup);
	my (%top,%bottom);
	#first find out where everyone wants to be
	foreach my $name (@names) {
	    $current++;
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		push (@truelist,$name);
		if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
		    $top{$name}=$current;
		} elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
		    $bottom{$name}=$current;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
		push (@falselist,$name);
		if ($Apache::response::foilgroup{$name.'.location'} eq 'top') {
		    $top{$name}=$current;
		} elsif ($Apache::response::foilgroup{$name.'.location'} eq 'bottom') {
		    $bottom{$name}=$current;
		}
	    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
	    } else {
		&Apache::lonxml::error(&HTML::Entities::encode("No valid value assigned ($Apache::response::foilgroup{$name.'.value'}) for foil $name in <foilgroup>",'<>&"'));
	    }
	}
	#pick a true statement
	my $notrue=0;
	if (scalar(@truelist) == 0) { $notrue=1; }
	my $whichtrue = int(&Math::Random::random_uniform() * ($#truelist+1));
	&Apache::lonxml::debug("Max is $max, From $#truelist elms, picking $whichtrue");
	my (@toplist, @bottomlist);
	my $topcount=0;
	my $bottomcount=0;
	# assign everyone to either toplist/bottomlist or whichfalse
	# which false is randomized, toplist bottomlist are in order
	while ((($#whichfalse+$topcount+$bottomcount) < $max-2) && ($#falselist > -1)) {
	    &Apache::lonxml::debug("Have $#whichfalse max is $max");
	    my $afalse=int(&Math::Random::random_uniform() * ($#falselist+1));
	    &Apache::lonxml::debug("From $#falselist elms, picking $afalse");
	    $afalse=splice(@falselist,$afalse,1);
	    &Apache::lonxml::debug("Picked $afalse");
	    &Apache::lonhomework::showhash(('names'=>\@names));
	    &Apache::lonhomework::showhash(%top);
	    if ($top{$afalse}) {
		$toplist[$top{$afalse}]=$afalse;
		$topcount++;
	    } elsif ($bottom{$afalse}) {
		$bottomlist[$bottom{$afalse}]=$afalse;
		$bottomcount++;
	    } else {
		push (@whichfalse,$afalse);
	    }
	}
	&Apache::lonxml::debug("Answer wants $answer");
	my $truename=$truelist[$whichtrue];
	my $dosplice=1;
	if ($notrue && $Apache::lonhomework::type ne 'survey') {
	    $dosplice=0;
	    &Apache::lonxml::error("There are no true statements available.<br />");
	}
	#insert the true statement, keeping track of where it wants to be
	if ($Apache::response::foilgroup{$truename.'.location'} eq 'top' && $dosplice) {
	    $toplist[$top{$truename}]=$truename;
	    $answer=-1;
	    foreach my $top (reverse(@toplist)) {
		if ($top) { $answer++;}
		if ($top eq $truename) { last; }
	    }
	    $dosplice=0;
	} elsif ($Apache::response::foilgroup{$truename.'.location'} eq 'bottom' && $dosplice) {
	    $bottomlist[$bottom{$truename}]=$truename;
	    $answer=-1;
	    foreach my $bot (@bottomlist) {
		if ($bot) { $answer++;}
		if ($bot eq $truename) { last; }
	    }
	    $answer+=$topcount+$#whichfalse+1;
	    $dosplice=0;
	} else {
	    if ($topcount>0 || $bottomcount>0) {
		$answer = int(&Math::Random::random_uniform() * ($#whichfalse+1))
		    + $topcount;
	    }
	}
	&Apache::lonxml::debug("Answer now wants $answer");
	#add the top items to the top, bottom items to the bottom
	for (my $i=0;$i<=$#toplist;$i++) {
	    if ($toplist[$i]) { unshift(@whichfalse,$toplist[$i]) }
	}
	for (my $i=0;$i<=$#bottomlist;$i++) {
	    if ($bottomlist[$i]) { push(@whichfalse,$bottomlist[$i]) }
	}
	#if the true statement is randomized insert it into the list
	if ($dosplice) { splice(@whichfalse,$answer,0,$truelist[$whichtrue]); }
    }
    &Apache::lonxml::debug("Answer is $answer");
    return ($answer,@whichfalse);
}

sub displayfoils {
    my ($target,$max,$randomize,$direction)=@_;
    my $result;

    my ($answer,@whichfoils)=&whichfoils($max,$randomize);
    my $part=$Apache::inputtags::part;
    my $solved=$Apache::lonhomework::history{"resource.$part.solved"};
    if ( ($target ne 'tex') &&
	 &Apache::response::show_answer() ) {
	if ($direction eq 'horizontal') {
	    if ($target ne 'tex') {
		$result.='<table><tr>';
	    }
	}
	foreach my $name (@whichfoils) {
	    if ($direction eq 'horizontal') {
		if ($target ne 'tex') { $result.='<td>'; }
	    }
	    if ($target ne 'tex') {
		$result.="<br />";
	    } else {
		$result.='\item \vskip -2 mm  ';
	    }
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') { 
		if ($target ne 'tex') { $result.='Correct:<b>'; } else { $result.='Correct: \textbf{';}
	    } else {
		$result.='Incorrect:';
	    }
	    if ($target eq 'web') { $result.="<label>"; }
	    $result.=$Apache::response::foilgroup{$name.'.text'};
	    if ($target eq 'web') { $result.="</label>"; }
	    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
		if ($target ne 'tex') { $result.='</b>';} else {$result.='}';}
	    }
	    if ($direction eq 'horizontal') {
		if ($target ne 'tex') { $result.='</td>'; }
	    }
	}
	if ($direction eq 'horizontal') {
	    if ($target ne 'tex') {
		$result.='</tr></table>';
	    }
	}
    } else {
	my @alphabet = ('A'..'Z');
	my $i = 0;
	my $temp=0;  
	my $id=$Apache::inputtags::response['-1'];
	my $part=$Apache::inputtags::part;
	my $lastresponse=$Apache::lonhomework::history{"resource.$part.$id.submission"};
	my %lastresponse=&Apache::lonnet::str2hash($lastresponse);
	if ($target ne 'tex' && $direction eq 'horizontal') {
	    $result.="<table><tr>";
	}
	foreach my $name (@whichfoils) {
	    if ($target ne 'tex') {
		if ($direction eq 'horizontal') {
		    $result.="<td>"; 
		} else { 
		    $result.="<br />";
		} 
	    }
	    if ($target ne 'tex') { 
                $result.= '<label>';
		$result.="<input type=\"radio\" name=\"HWVAL_$Apache::inputtags::response['-1']\" value=\"$temp\" ";
		if (defined($lastresponse{$name})) { $result .= 'checked="on"'; }
		$result .= '>'.$Apache::response::foilgroup{$name.'.text'}."</label>";
	    } else {
		if ($Apache::lonhomework::type eq 'exam') {
		    $result .= '{\small \textbf{'.$alphabet[$i].'}}$\bigcirc$'.$Apache::response::foilgroup{$name.'.text'}.'\\\\';  #' stupid emacs
		    $i++;
		} else {
		    $result .= '\vspace*{-2 mm}\item '.$Apache::response::foilgroup{$name.'.text'};
		}
	    }
	    if ($target ne 'tex' && $direction eq 'horizontal') {
		$result.="</td>"; 
	    }
	    $temp++;
	}
	if ($target ne 'tex' && $direction eq 'horizontal') {
	    $result.="</tr></table>";
	}
    }
    if ($target ne 'tex') { if ($direction ne 'horizontal') { $result.="<br />";} } else { $result.='\vskip 0 mm '; }
    return $result;
}

sub displayallanswers {
    my @names;
    if ( $Apache::response::foilgroup{'names'} ) {
	@names= @{ $Apache::response::foilgroup{'names'} };
    }
  
    my $result=&Apache::response::answer_header('radiobuttonresponse');
    foreach my $name (@names) {
	$result.=&Apache::response::answer_part('radiobuttonresponse',
				$Apache::response::foilgroup{$name.'.value'});
    }
    $result.=&Apache::response::answer_footer('radiobuttonresponse');
    return $result;
}

sub displayanswers {
    my ($max,$randomize)=@_;
    my ($answer,@whichopt) = &whichfoils($max,$randomize);
    my $result=&Apache::response::answer_header('radiobuttonresponse');
    if ($Apache::lonhomework::type eq 'exam') {
	my $correct = ('A'..'Z')[$answer];
	$result.=&Apache::response::answer_part('radiobuttonresponse',
						$correct);
    }
    foreach my $name (@whichopt) {
	$result.=&Apache::response::answer_part('radiobuttonresponse',
						$Apache::response::foilgroup{$name.'.value'});
    }
    $result.=&Apache::response::answer_footer('radiobuttonresponse');
    return $result;
}

sub start_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::radiobuttonresponse::conceptgroup=1;
    %Apache::response::conceptgroup=();
    my $result;
    if ($target eq 'edit') {
	$result.=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Concept:','concept',$token,'50').
	    &Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'concept');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_conceptgroup {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    $Apache::radiobuttonresponse::conceptgroup=0;
    my $result;
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer'  ||
	$target eq 'tex' || $target eq 'analyze') {
	&Apache::response::pick_foil_for_concept($target,
						 ['value','text','location'],
						 \%Apache::hint::radiobutton,
						 $parstack,$safeeval);
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::end_table();
    }
    return $result;
}

sub insert_conceptgroup {
    my $result="\n\t\t<conceptgroup concept=\"\">".&insert_foil()."\n\t\t</conceptgroup>\n";
    return $result;
}

sub start_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result='';
    if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
	&Apache::lonxml::startredirection;
	if ($target eq 'analyze') {
	    &Apache::response::check_if_computed($token,$parstack,$safeeval,'value');
	}
    } elsif ($target eq 'edit') {
	$result=&Apache::edit::tag_start($target,$token);
	$result.=&Apache::edit::text_arg('Name:','name',$token);
	$result.=&Apache::edit::select_or_text_arg('Correct Option:','value',
						   ['unused','true','false'],
						   $token);
	my $randomize=&Apache::lonxml::get_param('randomize',$parstack,
						 $safeeval,'-3');
	if ($randomize ne 'no') {
	    $result.=&Apache::edit::select_arg('Location:','location',
					       ['random','top','bottom'],$token);
	}
	$result.=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'value','name',
						     'location');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    } 
    return $result;
}

sub end_foil {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $text='';
    if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
	$text=&Apache::lonxml::endredirection;
    }
    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer'
	|| $target eq 'tex' || $target eq 'analyze') {
	my $value = &Apache::lonxml::get_param('value',$parstack,$safeeval);
	if ($value ne 'unused') {
	    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval);
	    if ($name eq "") {
		&Apache::lonxml::warning("Foils without names exist. This can cause problems to malfunction.");
		$name=$Apache::lonxml::curdepth;
	    }
	    if (defined($Apache::response::foilnames{$name})) {
		&Apache::lonxml::error(&mt("Foil name <b><tt>[_1]</tt></b> appears more than once. Foil names need to be unique.",$name));
	    }
	    $Apache::response::foilnames{$name}++;
	    my $location =&Apache::lonxml::get_param('location',$parstack,
						     $safeeval);
	    if ( $Apache::radiobuttonresponse::conceptgroup
		 && !&Apache::response::showallfoils() ) {
		push @{ $Apache::response::conceptgroup{'names'} }, $name;
		$Apache::response::conceptgroup{"$name.value"} = $value;
		$Apache::response::conceptgroup{"$name.text"} = $text;	
		$Apache::response::conceptgroup{"$name.location"} = $location;
	    } else {
		push @{ $Apache::response::foilgroup{'names'} }, $name;
		$Apache::response::foilgroup{"$name.value"} = $value;
		$Apache::response::foilgroup{"$name.text"} = $text;
		$Apache::response::foilgroup{"$name.location"} = $location;
	    }
	}
    }
    return '';
}

sub insert_foil {
    return '
<foil name="" value="unused">
<startouttext />
<endouttext />
</foil>';
}
1;
__END__