# The LearningOnline Network
# Group Bulletin Boards Manager
#
# 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::groupboards;

use strict;
use Apache::Constants qw(:common :http);
use Apache::loncommon;
use Apache::lonnet;
use Apache::lonnavmaps;
use Apache::lonuserstate;
use Apache::lonratedt;
use Apache::lonlocal;
use LONCAPA;

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

    #  Needs to be in a course
    if (! ($env{'request.course.fn'})) {
        # Not in a course
        $env{'user.error.msg'}=
     "/adm/groupboards:mdg:0:0:Cannot edit or view course groups";
        return HTTP_NOT_ACCEPTABLE;
    }

    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
                        ['group']);

    my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
    my $now = time;
    my $crstype = &Apache::loncommon::course_type();
    my $gpterm =  &Apache::loncommon::group_term();
    my $bodytitle = &mt('[_1] Discussion Boards',$crstype);
    my $group = $env{'form.group'};
    if (!defined($group)) {
        $r->print(&Apache::loncommon::start_page($bodytitle));
        $r->print(&mt('No [_1] defined, so there are no [_1] discussion boards to display',$gpterm));
        $r->print(&Apache::loncommon::end_page());
        return OK;
    }
    my $can_create=&Apache::lonnet::allowed('cgb',$env{'request.course.id'}.
                                            '/'.$group);
    my $can_view=&Apache::lonnet::allowed('pgd',$env{'request.course.id'}.
                                          '/'.$group);
    if (defined($env{'form.newbul'})) {
        if (($can_create) || (&Apache::lonnet::allowed('mdg',$env{'request.course.id'}))) {
            $r->print(&Apache::loncommon::start_page($bodytitle));
            my ($outcome,$symb,$newurl,$bbtitle) = 
		&create_board($cdom,$cnum,$group,$env{'form.newbul'});
            if ($outcome eq 'ok') {
                my ($furl,$ferr)= &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
                $r->print(&mt('The new discussion board was added successfully.<br />'));
                $r->print('<table border="0"><tr><td>'.
                          '<a href="'.$newurl.'?group='.$group.'">'.
                          &mt('Edit [_1] board',$bbtitle).'</a></td>'.
                           '<td>&nbsp;&nbsp;</td><td>'.
                          '<a href="/adm/groupboards?group='.$group.'">'.
                          &mt('View all group discussion boards').
                          '</a></td></tr></table>');
            } else {
                $r->print(&mt('There was a problem creating the new discussion board - [_1]','<span class="LC_error">'.$outcome.'</span>').'<br /><a href="/adm/groupboards?group='.$group.'">'.
                         &mt('Return to discussion boards').'</a>');
            }
            $r->print(&Apache::loncommon::end_page());
            return OK;
        }
    }
    my $jscript;
    if (($can_create) || (&Apache::lonnet::allowed('mdg',$env{'request.course.id'}))) {
        $jscript = qq|
function makebulboard() {
   var title=prompt('Discussion Board Title');
   if (title) {
    this.document.forms.newbb.newbul.value=
        title+'=/adm/$cdom/$cnum/$now/bulletinboard';
    this.document.forms.newbb.submit();
   }
}
|;
    }
    $r->print(&Apache::loncommon::start_page($bodytitle,
                                       '<script type="text/javascript">'.
                                       $jscript.'</script>'));
    if (!$can_view) {
        $r->print(&mt('You do not have privileges to view discussion boards in this [_1]',$crstype));
        return OK;
    }
    my $navmap = Apache::lonnavmaps::navmap->new();
    my @groupboards;
    my %boards;
    my $grpbbmap = &get_bbfolder_url($cdom,$cnum,$group);
    if ($grpbbmap) {
        my $bbfolderres = $navmap->getResourceByUrl($grpbbmap);
        if ($bbfolderres) {
            my @boards = $navmap->retrieveResources($bbfolderres,undef,0,0);
            foreach my $res (@boards) {
                my $url = $res->src();
                if ($url =~ m|^/adm/\Q$cdom\E/\Q$cnum\E/\d+/bulletinboard|) {
                    push(@groupboards,$res->symb());
                    $boards{$res->symb()} = {
                                        title => $res->title(),
                                        url   => $res->src(),
				    };
                }
            }
        }
    }
    if (($can_create) || (&Apache::lonnet::allowed('mdg',$env{'request.course.id'}))) {
        $r->print('<form method="post" name="newbb" action="/adm/groupboards">'.
                  "\n".'<input type="button" name="bbbutton" value="'.
                  &mt('New Discussion Board').
                  '" onClick="javascript:makebulboard();" />'."\n".
                  '  <input type="hidden" name="newbul" />'."\n".
                  '  <input type="hidden" name="group" value="'.$group.'" />'.
                  "\n".'</form><br />');
    }
    if (@groupboards) {
        foreach my $board (@groupboards) {
            $r->print('<a href="'.$boards{$board}{'url'}.'?group='.$group.'">'.$boards{$board}{'title'}.'</a><br />');
        }
    } else {
        $r->print(&mt('There are currently no discussion boards in this [_1].',
                      $gpterm));
    }
    $r->print(&Apache::loncommon::end_page());
    return OK;
}

sub create_board {
    my ($cdom,$cnum,$group,$newboard,$symb) = @_;
    my ($bbtitle,$newurl)=split(/\=/,$newboard);
    $bbtitle=&unescape($bbtitle);
    $newurl=&unescape($newurl);
    my $allbbsmap = &get_bbfolder_url($cdom,$cnum,$group);
    my ($outcome,$symb);
    if ($allbbsmap =~ m|^/uploaded|) {
        my ($errtext,$fatal)=&Apache::lonratedt::mapread($allbbsmap);
        if (!$fatal) {
            my $newidx=&Apache::lonratedt::getresidx($newurl);
            $Apache::lonratedt::resources[$newidx]=$bbtitle.':'.$newurl.
                                                   ':false:normal:res';
            push(@Apache::lonratedt::order,$newidx);
            my ($errtext,$fatal)=&Apache::lonratedt::storemap($allbbsmap,1);
            if ($fatal) {
                $outcome = "error: failed to store discussion boards map - $errtext\n";
            } else {
                $outcome = 'ok';
                $symb = &Apache::lonnet::encode_symb($allbbsmap,$newidx,$newurl);
            }
        } else {
            $outcome = "error: failed to read all discussion boards map - $errtext\n";
        }
    } else {
        $outcome = 'error: discussion boards folder absent, '.
                   'or in unexpected location - '.$allbbsmap."\n";
    }
    return ($outcome,$symb,$newurl,$bbtitle);
}

sub get_bbfolder_url {
    my ($cdom,$cnum,$group) = @_;
    my %curr_groups = &Apache::longroup::coursegroups($cdom,$cnum,$group);
    my $grpbbmap;
    if (%curr_groups) {
        my %group_info =  &Apache::longroup::get_group_settings(
                                                    $curr_groups{$group});
        my $creation = $group_info{'creation'};
        my $bbfolder = $creation + 1;
        my $crspath = '/uploaded/'.$cdom.'/'.$cnum.'/';
        $grpbbmap = $crspath.'default_'.$bbfolder.'.sequence';
    }
    return $grpbbmap;
}

1;