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- symb is already present in the key for all parameters stored for an
  instance of a simpleproblem.

# The LearningOnline Network
# Simple Problem Parameter Setting "Editor"
#
# $Id: lonsimpleproblemedit.pm,v 1.38 2015/09/11 00:56:41 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::lonsimpleproblemedit;

use strict;
use Apache::Constants qw(:common :http);
use Apache::loncommon;
use Apache::lonnet;
use Apache::lonlocal;
use Apache::lonnavmaps;
use lib '/home/httpd/lib/perl/';
use LONCAPA;
 

my %qparms;
my $prefix;
my $qtype;

sub evaloptionhash {
    my $options=shift;
    $options=~s/^\(\'//;
    $options=~s/\'\)$//;
    my %returnhash=();
    foreach (split(/\'\,\'/,$options)) {
	$returnhash{$_}=$_;
    }
    return %returnhash;
}

sub rawrendering {
    my ($symb)=@_;
    my %data=('show_errors'=>'on',
	      'simple_edit_button' => 'off',
	      'devalidatecourseresdata'=>'on');
    return &Apache::loncommon::get_student_view($symb,time,time,
						$env{'request.course.id'},
						'web',\%data);
}

sub questiontext {
    my $text=$qparms{$prefix.'questiontext'};
    my $qt=&mt('Question Text');
    my $spell_link=
	&Apache::lonhtmlcommon::spelllink('simpleedit','questiontext');
    return (<<ENDQUESTION);
<table bgcolor="#dddd22" cellspacing="4" cellpadding="2" style="width:100%">
<tr><td><b>$qt</b><br />
<textarea style="width:99%" name="questiontext" cols="80" rows="8">$text</textarea>
<br />$spell_link
</td></tr>
</table>
<br />
ENDQUESTION
}

sub hint {
    my $text=$qparms{$prefix.'hinttext'};
    my $ht=&mt('Hint Text');
    my $spell_link=
	&Apache::lonhtmlcommon::spelllink('simpleedit','hinttext');
    return (<<ENDHINT);
<table bgcolor="#accacc" cellspacing="4" cellpadding="2" style="width:100%">
<tr><td><b>$ht</b><br />
<textarea style="width:99%" name="hinttext" cols="80" rows="4">$text</textarea>
<br />$spell_link
</td></tr>
</table>
<br />
ENDHINT
}

sub script {
    my $text=$qparms{$prefix.'numericalscript'};
    my $ht=&mt('Scripting (optional)');
    return (<<ENDSCRIPT);
<table bgcolor="#ccccaa" cellspacing="4" cellpadding="2" style="width:100%">
<tr><td><b>$ht</b><br />
<textarea style="width:99%" name="numericalscript" cols="80" rows="4">$text</textarea>
</td></tr>
</table>
<br />
ENDSCRIPT
}

sub foil {
    my $number=shift;
    my (%values,%defaultvalues,%customvalues);
    %defaultvalues = &Apache::lonlocal::texthash(
                         'unused' => 'Not shown, not used'
                     );
    if ($qtype eq 'radio') {
        %customvalues = &Apache::lonlocal::texthash(
                                       'true' => 'True',
                                       'false' => 'False'
        );
    } elsif ($qtype eq 'option') {
        %customvalues=&evaloptionhash($qparms{$prefix.'options'});
    }
    %values = (%defaultvalues,%customvalues);
    my $value=$qparms{$prefix.'value'.$number};
    unless (defined($value)) { $value='unused'; }
    unless ($values{$value}) { $value='unused'; }
    my $position=$qparms{$prefix.'position'.$number};
    my %positions=('random' => 'Random position',
		   'top'    => 'Show always at top position',
		   'bottom' => 'Show always at bottom position');
    unless (defined($position)) { $position='random'; }
    unless ($positions{$position}) {
	$position='random';
    }
    my $selectvalue=&Apache::loncommon::select_form(
                        $value,
                        'value'.$number,
                        \%values);
    my $selectposition=&Apache::loncommon::select_form(
                           $position,
                           'position'.$number,
                           {&Apache::lonlocal::texthash(%positions)});
    my $text=$qparms{$prefix.'text'.$number};
    my %lt=&Apache::lonlocal::texthash('foil'  => 'Foil',
				       'value' => 'Value',
				       'pos'   => 'Position',
				       'text'  => 'Text');

    my $spell_link=
	&Apache::lonhtmlcommon::spelllink('simpleedit',"text$number");
    return (<<ENDFOIL);
<table bgcolor="#E8D8EE" cellspacing="2" cellpadding="1" style="width:100%">
<tr><td colspan="2"><b>$lt{'foil'}</b></td></tr>
<tr><td>$lt{'value'}: $selectvalue</td><td>$lt{'pos'}: $selectposition</td></tr>
<tr><td colspan="2">$lt{'text'}:<br />
<textarea style="width:99%" name="text$number" cols="80" rows="4">$text</textarea>
<br />$spell_link
</td></tr>
</table>
<br />
ENDFOIL
}

sub get_parent_uri {
    my ($cur_symb)=@_;
    my $navmap = Apache::lonnavmaps::navmap->new();
    if (defined($navmap)) {
        my $it = $navmap->getIterator(undef, undef, undef, 1);
        while ( my $res=$it->next()) {
	    if (ref($res) &&  $res->symb() eq  $cur_symb) { last; }
        }
        my ($src,$symb,$anchor)=&Apache::lonnavmaps::getLinkForResource($it->getStack());
        if (defined($anchor)) { $anchor='#'.$anchor; }
        return $src.'?symb='.&escape($symb).$anchor;
    }
    return;
}

sub handler {
    my $r = shift;

    if ($r->header_only) {
        &Apache::loncommon::content_type($r,'text/html');
        $r->send_http_header;
        return OK;
    }

# -------------------------------------------------------------------- Allowed?
    unless (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
	return HTTP_NOT_ACCEPTABLE; 
    }
# ----------------------------------------------------------------- Send header
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
# ----------------------------------------------------- Figure out where we are
    my $uri=$r->uri;
    $uri=~s/\/smpedit$//;
    my $symb=&Apache::lonnet::symbread();

# ------------------------------------------------ Prefix for everything stored
    $prefix=$env{'request.course.id'}.'.'.$symb.'.0.';
#------------------------------------------------- Prefix for storing weight of Problem Parts
    my $weightprefix=$env{'request.course.id'}.'.'.$symb.'.';
    
# ---------------------------------------------------------- Anything to store?
    my $storeresult;
    if (($symb) && (defined($env{'form.questiontype'}))) {
        my %storecontent=();
        undef %storecontent;
        if ($env{'form.questiontype'} eq 'option') {
	    my %curoptions=&evaloptionhash($env{'form.options'});
	    if ($env{'form.delopt'}) {
		delete $curoptions{$env{'form.delopt'}};
	    }
	    if ($env{'form.newopt'}) {
		$env{'form.newopt'}=~s/\'/\\\'/g;
                $curoptions{$env{'form.newopt'}}=$env{'form.newopt'};
	    }
            $env{'form.options'}="('".join("','",keys(%curoptions))."')";
	}
	$env{'form.hiddenparts'}='!'.$env{'form.questiontype'};
        foreach my $envkey (keys(%env)) {
	    if ($envkey=~/^form\.(\w+)$/) {
                my $parm=$1;
                next if ($parm eq 'symb');
		$storecontent{$prefix.$parm}=$env{'form.'.$parm};
                $storecontent{$prefix.$parm}=~s/^\s+//s;
		$storecontent{$prefix.$parm}=~s/\s+$//s;
	    }
	}
# ---------------------------------------------------- Set weights of hidden parts to zero
# ------------------------------------------------------ and used part to 1
	$storecontent{$weightprefix.'essay.weight'}=0;
	$storecontent{$weightprefix.'numerical.weight'}=0;
	$storecontent{$weightprefix.'option.weight'}=0;
	$storecontent{$weightprefix.'radio.weight'}=0;
	$storecontent{$weightprefix.'string.weight'}=0;
	$storecontent{$weightprefix.$env{'form.questiontype'}.'.weight'}=1;


	my $reply=&Apache::lonnet::cput
	    ('resourcedata',\%storecontent,
	     $env{'course.'.$env{'request.course.id'}.'.domain'},
	     $env{'course.'.$env{'request.course.id'}.'.num'});

        &Apache::lonnet::devalidatecourseresdata(
                            $env{'course.'.$env{'request.course.id'}.'.num'},
                            $env{'course.'.$env{'request.course.id'}.'.domain'});
        if ($reply eq 'ok') {
            if ($env{'form.forceview'}) {
                my $dest = &get_parent_uri($symb);
                if ($dest) {
                    $r->internal_redirect($dest);
                    return OK;
                }
            }
        } else {
            $storeresult = $reply;
        }
    }
# ------------------------------------------------------------------- Read Data

    %qparms=&Apache::lonnet::dump('resourcedata',
		     $env{'course.'.$env{'request.course.id'}.'.domain'},
		     $env{'course.'.$env{'request.course.id'}.'.num'},
		     $env{'request.course.id'}.'.'.$symb);

    my $js = <<"ENDJS";

<script type="text/javascript">
// <![CDATA[

function setForceView() {
    if (document.getElementById('spview')) {
        document.getElementById('spview').value = 1;
    }
    return true;
}
// END LON-CAPA Internal -->
// ]]>
</script>

ENDJS

# ------------------------------------------------------------ Print the screen
    my $spell_header=&Apache::lonhtmlcommon::spellheader();
    $r->print(&Apache::loncommon::start_page('Simple Problem Editor',
					     $spell_header.$js));
    if ($symb) {
	    my $title='<h1>'.&Apache::lonnet::gettitle($symb).'</h1>';
        if (&get_parent_uri($symb)) {
            $r->print($title);
            if ($storeresult) {
                $r->print('<p class="LC_error">'.&mt('An error: [_1] occurred saving your changes',$storeresult).'</p>'); 
            }
        } else {
            $r->print($title
                     .'<p class="LC_error">'
                     .&mt('An error occurred retrieving the link to this problem.')
                     .'<br />'
                     .&mt('You may need to [_1]re-select the course[_2] and then return to this resource to view it.'
                         ,'<a href="/adm/roles">','</a>')
                     .'</p>'
            );
        }
        $r->print('<p class="LC_warning">'
                 .&mt('Note: it can take up to 10 minutes for changes to take effect for all users.')
                 .&Apache::loncommon::help_open_topic('Caching')
                 .'</p>'
        );

        $r->print(
            '<div class="LC_Box">'
           .&rawrendering($symb)
           .'</div>'
        );
        $r->print('<form name="simpleedit" method="post" action="">');
# Question Type        
        my %questiontypes=(
               'radio'     => '1 out of N multiple choice (radio button)',
               'option'    => 'Option Response',
               'string'    => 'Short string response',
               'essay'     => 'Essay, open end',
               'numerical' => 'Numerical Response');
        $qtype=$qparms{$prefix.'questiontype'};
        unless (defined($qtype)) { $qtype='radio'; }
        unless ($questiontypes{$qtype}) { $qtype='radio'; }
        $r->print(
            '<fieldset style="width:400px;">'
           .'<legend>'.&mt('Question Type').'</legend>'
           .&Apache::loncommon::select_form(
                $qtype,
                'questiontype',
                {&Apache::lonlocal::texthash(%questiontypes)})
           .'</fieldset>'
        );
        $r->print(
            '<p>'
           .'<input type="hidden" name="forceview" value="" id="spview" />' 
           .'<input type="submit" value="'.&mt('Save and Edit').'" />'
           .('&nbsp;' x3)
           .'<input type="submit" value="'.&mt('Save and View').'" onclick="javascript:setForceView();" />'
           .'</p>'
        );
# Script
        if ($qtype eq 'numerical') {
           $r->print(&script());
        }
# Question Text
        $r->print(&questiontext());
# Radio, Option ===
	if (($qtype eq 'radio') || ($qtype eq 'option')) {
# Response
            my $maxfoils=$qparms{$prefix.'maxfoils'};
            unless (defined($maxfoils)) { $maxfoils=10; }
            unless ($maxfoils=~/^\d+$/) { $maxfoils=10; }
            if ($maxfoils<=0) { $maxfoils=10; }
            my %randomizes=(
                   'yes' => 'Display foils in random order',
                   'no'  => 'Display foils in order given');
	    my $randomize=$qparms{$prefix.'randomize'};
            unless (defined($randomize)) { $randomize='yes'; }
            unless ($randomizes{$randomize}) { $randomize='yes'; }
	    $r->print(
		  '<table bgcolor="#00ee44" cellspacing="4" cellpadding="2" style="width:100%">'.
	          '<tr><td>'.&mt('Max number of foils displayed').
': <input type="text" size="3" name="maxfoils" value="'.$maxfoils.'" />&nbsp;&nbsp;'.
                      &Apache::loncommon::select_form(
                          $randomize,
                          'randomize',
                          {&Apache::lonlocal::texthash(%randomizes)}).
		  '</td></tr><tr><td bgcolor="#F0F0F0">');
# Option Response: Options
	    if ($qtype eq 'option') {
		my $options=$qparms{$prefix.'options'};
                unless (defined($options)) { $options="('true','false')"; }
                my %optionshash=&evaloptionhash($options);
		$r->print(
		  '<table bgcolor="#ffcc22" cellspacing="4" cellpadding="2" style="width:100%">'.
		  '<tr><td><input type="hidden" name="options" value="'.
                  $options.'" />'.&mt('Add new option').': '.
          '<input type="text" name="newopt" size="15" />'.
          &mt('Delete an option').': '.
          &Apache::loncommon::select_form('','delopt',{'' => '',%optionshash}).
          '</td></tr><tr><td>');
	    }
# Foils
	    for (my $i=1;$i<=10;$i++) {
		$r->print(&foil($i));
	    }
# End Options
	    if ($qtype eq 'option') {
		$r->print('</td></tr></table>');
	    }

# End Response
	    $r->print('</td></tr></table><br />');
# Hint
	    $r->print(&hint());
	}
	if ($qtype eq 'string') {
            my %stringtypes=(
	       'cs' => 'Case sensitive',
	       'ci' => 'Case Insensitive',
	       'mc' => 'Multiple Choice, Order of characters unchecked');
            my $stringanswer=$qparms{$prefix.'stringanswer'};
            unless (defined($stringanswer)) { $stringanswer=''; }
            my $stringtype=$qparms{$prefix.'stringtype'};
            unless (defined($stringtype)) { $stringtype='cs'; }
            unless ($stringtypes{$stringtype}) { $stringtype='cs'; }
	    $r->print(
		  '<table bgcolor="#00ee44" cellspacing="4" cellpadding="2" style="width:100%">'.
	          '<tr><td><label>'.&mt('Correct answer').': <input type="text" size="20" name="stringanswer" value="'.$stringanswer.'" /></label>&nbsp;&nbsp;'.
                      &Apache::loncommon::select_form(
                          $stringtype,
                          'stringtype',
                          {&Apache::lonlocal::texthash(%stringtypes)}).
		  '</td></tr></table><br />');
# Hint
	    $r->print(&hint());
	}
        if ($qtype eq 'numerical') {
           my $numericalanswer=$qparms{$prefix.'numericalanswer'};
           unless (defined($numericalanswer)) { $numericalanswer=''; }
           my $numericaltolerance=$qparms{$prefix.'numericaltolerance'};
           unless (defined($numericaltolerance)) { $numericaltolerance='5%'; }
           my $numericalsigfigs=$qparms{$prefix.'numericalsigfigs'};
           unless (defined($numericalsigfigs)) { $numericalsigfigs='1,15'; }

           $r->print(
                  '<table bgcolor="#00ee44" cellspacing="4" cellpadding="2" style="width:100%">'.
                  '<tr><td><label>'.&mt('Correct answer').': <input type="text" size="20" name="numericalanswer" value="'.$numericalanswer.'" /></label>&nbsp;&nbsp;'.
                  '<label>'.&mt('Unit').':  <input type="text" size="5" name="numericalunit" value="'.$qparms{$prefix.'numericalunit'}.'" /></label>&nbsp;&nbsp;'.
                  '<label>'.&mt('Format').':  <input type="text" size="5" name="numericalformat" value="'.$qparms{$prefix.'numericalformat'}.'" /></label>&nbsp;&nbsp;'.
                  '<label>'.&mt('Tolerance').':  <input type="text" size="5" name="numericaltolerance" value="'.$numericaltolerance.'" /></label>&nbsp;&nbsp;'.
                  '<label>'.&mt('Significant digits').':  <input type="text" size="5" name="numericalsigfigs" value="'.$numericalsigfigs.'" /></label>'.
                  '</td></tr></table><br />');
           $r->print(&hint());
        }
# Store Button
	$r->print(
  '<input type="submit" value="'.&mt('Save and Edit').'" />'.
  ('&nbsp;' x3).
  '<input type="submit" value="'.&mt('Save and View').'" onclick="javascript:setForceView();" />'.
  '</form>');
    } else {
	$r->print(&mt('Could not identify problem.'));
    }
    $r->print(&Apache::loncommon::end_page());
    return OK;
}

1;
__END__