# The LearningOnline Network with CAPA
# displays the main menu
#
# $Id: lonmainmenu.pm,v 1.8.4.3 2009/12/07 22:33:26 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/
#
#
# There are two parameters controlling the action of this module:
#
# browser.interface - if this is 'textual', it overrides the second parameter
# and goes to screen reader PDA mode
#
# environment.remote - if this is 'on', the routines controll the remote
# control, otherwise they render the main window controls; ignored it
# browser.interface is 'textual'
#

package Apache::lonmainmenu;

use strict;
use Apache::Constants qw(:common);
use Apache::loncommon();
use Apache::lonnet;
use Apache::lonmenu();
use Apache::lonlocal;
use LONCAPA qw(:DEFAULT :match);

sub handler {
    my $r = shift;
    &Apache::loncommon::no_cache($r);
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    return OK if $r->header_only;

    my $form;
    if ($env{'environment.remote'} ne 'off') {
	$form=&Apache::lonmenu::serverform();
    }

    my $custommenu = &Apache::loncommon::needs_gci_custom();
    my ($script_tag,$switcher);
    if ($env{'environment.remote'} ne 'off') {
        my $utility=&Apache::lonmenu::utilityfunctions('/adm/menu');
        $script_tag=(<<ENDSCRIPT);
<script type="text/javascript">
$utility
</script>
ENDSCRIPT
    } elsif ($custommenu) {
        my $switcher_js;
        my %courses = &Apache::loncommon::existing_gcitest_courses();
        my $numcourses = keys(%courses);
        if ($numcourses > 0) {
            $switcher = &gcitest_switcher(%courses);
            my $current;
            if ($env{'request.course.id'}) {
                $current = 'cc./'.$env{'course.'.$env{'request.course.id'}.'.domain'}.
                           '/'.$env{'course.'.$env{'request.course.id'}.'.num'};
            }
            $switcher_js = &gcitest_switcher_js($current,$numcourses);
            $script_tag= <<"ENDSCRIPT";
<script type="text/javascript">
$switcher_js
</script>
ENDSCRIPT
        }
    }
# ---- Print the screen, pretend to be in text mode to generate text-based menu
# temporarily set interface to "faketextual" and remote to "off", which renders
# the main menu
    $env{'browser.interface'}='faketextual';
    $env{'environment.remote'}='off';

    $r->print(&Apache::loncommon::start_page( 'Main Menu',
                                              $script_tag,
                                              {'bread_crumbs' => 1}));
    if ($custommenu) {
        $r->print(&Apache::lonmenu::inlinemenu('gcicustom',$switcher).$form);
    } else {
        $r->print(&Apache::lonmenu::inlinemenu().$form);
    }
    $r->print(&Apache::loncommon::end_page());
    return OK;
}

sub gcitest_switcher {
    my (%courses) = @_;
    my $output;
    my %Sortby;
    foreach my $course (sort(keys(%courses))) {
        next unless (ref($courses{$course}) eq 'HASH');
        my $clean_title = $courses{$course}{'description'};
        $clean_title =~ s/\W+//g;
        if ($clean_title eq '') {
            $clean_title = $courses{$course}{'description'};
        }
        push(@{$Sortby{$clean_title}},$course);
    }
    my @sorted_courses = sort { lc($a) cmp lc($b) } (keys(%Sortby));
    my $default;
    if (@sorted_courses > 1) {
        if (($env{'request.course.id'}) && ($courses{$env{'request.course.id'}})) {
            $default = &mt('Switch concept test ...');
        } else {
            $default = &mt('Select a concept test ...');
        }
    } else {
        unless (($env{'request.course.id'}) && ($courses{$env{'request.course.id'}})) {
            $default = &mt('Select concept test ...');
        }
    }
    if ($default) {
        $output = '<form name="pickrole" action="/adm/roles" method="post">'.
                  '<select name="newrole" method="post" onchange="javascript:courseswitcher();">'.
                  '<option value="" selected="selected">'.$default.'</option>';
        foreach my $item (@sorted_courses) {
            foreach my $course (@{$Sortby{$item}}) {
                my ($cdom,$cnum) = split('_',$course);
                $output .= '<option value="cc./'.$cdom.'/'.$cnum.'">'.$item.'</option>';
            }
        }
        $output .= '</select><input type="hidden" name="selectrole" value="" /></form>';
    }
    return $output;
}

sub gcitest_switcher_js {
    my ($current,$numcourses) = @_;
    my $output = <<"ENDJS";

function courseswitcher(caller) {
    var numcourses = $numcourses;
    var current = '$current';
    var choice = document.pickrole.newrole.options[document.pickrole.newrole.selectedIndex].value;
    if (choice == '') {
        if (caller == 'icon') {
            alert('No Concept Test selected');
        }
        document.pickrole.selectrole.value = '';
        return;
    }
    if (choice == current) {
        if ((caller != 'icon') && (numcourses > 1)) {
            alert('You have selected the current course.\\nPlease select a different Concept Test course');
        }
        document.pickrole.newrole.selectedIndex = 0;
        document.pickrole.selectrole.value = '';
        return;
    }
    document.pickrole.selectrole.value = '1';
    document.pickrole.submit();
    return;
}

ENDJS
    return $output;
}

1;
__END__