# The LearningOnline Network
# Page with Daxe on the left side and the preview on the right side
#
# $Id: daxepage.pm,v 1.6 2023/11/19 21:28:17 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::daxepage;
use strict;

use Apache::loncommon();
use Apache::lonhtmlcommon();
use Apache::lonmenu();
use Apache::lonlocal;
use Apache::Constants qw(:common);
use HTML::Entities();

sub handler {
    my $request = shift;
    my $uri = $request->uri;
    $uri =~ s{^/daxepage}{};
    &Apache::loncommon::content_type($request,'text/html');
    if ($uri !~ /\.(task|problem|exam|quiz|assess|survey|library|xml|html|htm|xhtml|xhtm)$/) {
        $request->status(406);
        return OK;
    }
    my %editors = &Apache::loncommon::permitted_editors();
    unless ($editors{'daxe'}) {
        my $msg = '<p class="LC_warning">'.
                  &mt('Daxe editor is not enabled for this Authoring Space.').'</p>';
        &do_redirect($request,$uri,$msg);
        return OK;
    }
    my %lt = &Apache::lonlocal::texthash(
                                          'noif' => 'No iframe support.',
                                          'show' => 'Show content in pop-up window',
                                        );
    my $name = $uri;
    $name =~ s/^.*\/([^\/]+)$/$1/;
    my $daxeurl = '/adm/daxe/daxe.html?config=config/loncapa_config.xml&save=/daxesave'.
                  '&file=/daxeopen'.$uri;
    my $headjs = &Apache::loncommon::iframe_wrapper_headjs().
                 &toggle_LCmenus_js();
    my $args = {
                'collapsible_header' => 1,
               };
    my $startpage = &Apache::loncommon::start_page('Daxe: '.$name,$headjs,$args).
                    &Apache::lonmenu::constspaceform();
    my $endpage = &Apache::loncommon::end_page();

    # javascript will position the iframe if window was resized (or zoomed)
    my $script = &Apache::loncommon::iframe_wrapper_resizejs();
    my $dest = &HTML::Entities::encode($daxeurl,'&<>"');
    my $noiframe = &Apache::loncommon::modal_link($dest,$lt{'show'},500,400);

    $request->print(<<"ENDFRAME");
$startpage
$script
<div class="LC_iframecontainer" style="padding-right: 5px">
<iframe src="$dest">$lt{'noif'} $noiframe</iframe>
</div>
$endpage
ENDFRAME
    return OK;
}

sub toggle_LCmenus_js {
    my %lt = &Apache::lonlocal::texthash(
                                         altc => 'menu state: collapsed',
                                         alte => 'menu state: explanded',
                                         ttlc => 'display standard menus',
                                         ttle => 'hide standard menus',
    );
    return <<"ENDJS";
<script type="text/javascript">
//<![CDATA[
\$(document).ready (function () {
    \$(".LC_collapse_trigger").on("click", function (e) {
        var id = this.id;
        var \$content = \$(this).next (".LC_menus_content");
        var expanded = \$content.hasClass ("shown");
        var frameleftpos;
        if (expanded) {
            \$content.removeClass ("shown");
            \$content.addClass ("hidden");
        } else {
            \$content.removeClass ("hidden");
            \$content.addClass ("shown");
        }

        \$(this).find ("[aria-expanded]")
        .attr ("aria-expanded", !expanded);

        \$(this).find ("[aria-pressed]")
        .attr ("aria-pressed", !expanded);

        \$(this).find (".LC_collapsible_indicator").attr ({
        "src":
        (expanded)? "/res/adm/pages/collapsed.png" : "/res/adm/pages/expanded.png",
        "alt":
        (expanded)? "$lt{altc}" : "$lt{alte}",
        "title":
        (expanded)? "$lt{ttlc}" : "$lt(ttle}"
        });

        \$(window).trigger('resize');
        \$(this).focus ();
    });

    \$("#LC_expandingContainer").attr ("aria-live", "off");
});
//]]>
</script>
ENDJS

}

sub do_redirect {
    my ($request,$uri,$msg) = @_;
    &Apache::lonhtmlcommon::clear_breadcrumbs();
    $request->print(
        &Apache::loncommon::start_page('Authoring Space',undef,
                                       {'redirect'       => [2,$uri]}).

        '<div style="padding:0;clear:both;margin:0;border:0"></div>'."\n".
        "$msg\n".
        &Apache::loncommon::end_page());
    return;
}

1;
__END__