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# The LearningOnline Network
# Bulletin Board Handler
#
# $Id: lonbulletin.pm,v 1.43 2007/05/02 01:33:48 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::lonbulletin;

use strict;
use Apache::Constants qw(:common);
use Apache::loncommon;
use Apache::lonnet;
use Apache::lontexconvert;
use Apache::lonfeedback;
use Apache::lonlocal;
use Apache::lonhtmlcommon;
use HTML::Entities();
use LONCAPA;

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

# ------------------------------------------------------------ Print the screen
    if ($target eq 'tex') {
	$r->print(&Apache::lonprintout::print_latex_header($env{'form.latex_type'}));
    }
    my (undef,undef,undef,undef,$marker)=split(/\//,$r->uri);
# Is this even in a course?
    if (!$env{'request.course.id'}) {
	&Apache::loncommon::simple_error_page($r,'Not in a course',
				                'Not in a course');
        return OK;
    }

    $marker=~s/\D//g;

    if (!$marker) {
	&Apache::loncommon::simple_error_page($r,'Invalid Call',
					      'Invalid Call');
        return OK;
    }

    my $dom = $env{'course.'.$env{'request.course.id'}.'.domain'};
    my $crs = $env{'course.'.$env{'request.course.id'}.'.num'};
    my ($group,$grp_desc);

# --------------------------------------------------------- The syllabus fields
    my %syllabusfields=&Apache::lonlocal::texthash(
       'aaa_title'         => 'Topic',
       'bbb_content'       => 'Task',
       'ccc_webreferences' => 'Web References');

# ------------------------------------------------------------ Get Query String
    &Apache::loncommon::get_unprocessed_cgi
                ($ENV{'QUERY_STRING'},['forcestudent','forceedit','register',
                                       'origpage','group','ref']);
# ----------------------------------------------------- Force menu registration
    my %addentries;
    if ($env{'form.origpage'}) {
	$addentries{'onload'} = "document.location='#newpost';";
    }
# --------------------------------------------------------------- Force Student
    my $forcestudent='';
    if ($env{'form.forcestudent'}) { $forcestudent='student'; }

    my $forceedit='';
    if ($env{'form.forceedit'}) { $forceedit='edit'; }
    my $refarg = '';
    if (exists($env{'form.ref'})) { $refarg = 'ref='.$env{'form.ref'}; }

    my %syllabus=&Apache::lonnet::dump('bulletinpage_'.$marker,$dom,$crs);

    my $boardurl = $r->uri;
    if ($boardurl =~ m|/adm/\Q$dom\E/\Q$crs\E/\d+/bulletinboard|) {
        if (!exists($syllabus{'group'})) {
            &Apache::loncommon::simple_error_page($r,'Group information missing',
                                                 'Group information missing');

            return OK;
        } else {
            $group = $syllabus{'group'};
            if ($group eq '') {
                &Apache::loncommon::simple_error_page($r,'Invalid group',
                                                     'Invalid group');
                return OK;
            }
            my %curr_groups = &Apache::longroup::coursegroups($dom,$crs,$group);
            if (!defined($curr_groups{$group})) {
                &Apache::loncommon::simple_error_page($r,'Invalid group',
                                                     'Invalid group');
                return OK;
            } else {
                my %content = &Apache::longroup::get_group_settings(
                                                          $curr_groups{$group});
                $grp_desc = &unescape($content{'description'});
            }
        }
    }
       
# --------------------------------------- There is such a user, get environment
    if ($target ne 'tex') {  
	my $start_page =
	    &Apache::loncommon::start_page("Bulletin Board/Discussion",undef,
					   {'function'       => $forcestudent,
					    'add_entries'    => \%addentries,
					    'domain'         => $dom,
					    'force_register' =>
						$env{'form.register'}});
	$r->print($start_page);
        if ($group ne '' && $env{'form.group'} eq $group) {
            my $gpterm =  &Apache::loncommon::group_term();
            my $ucgpterm = $gpterm;
            $ucgpterm =~ s/^(\w)/uc($1)/e;
            my ($groupboards,$boards) =
                &Apache::longroup::get_group_bbinfo($dom,$crs,$group,$boardurl);
            my $boardtitle;
            if ((ref($groupboards) eq 'ARRAY') && (@{$groupboards} > 0)) {
                $boardtitle = $$boards{$$groupboards[0]}{'title'};
            }
            $boardurl .= '?register=1&group='.$group;
            $r->print(&groupboard_breadcrumbs($dom,$crs,$group,$refarg,$gpterm,
                                $ucgpterm,$grp_desc,$boardurl,$boardtitle));
        }
    }
    my ($allowed);
    if ($group ne '') {
        $allowed=&Apache::lonnet::allowed('mdg',$env{'request.course.id'}.($env{'request.course.sec'}?'/'.$env{'request.course.sec'}:''));
        if (!$allowed) {
            $allowed = &Apache::lonnet::allowed('cgb',$env{'request.course.id'}.
                                                '/'.$group);
        }
        if (!$allowed) {
            if ((!&Apache::lonnet::allowed('vcg',$env{'request.course.id'}.($env{'request.course.sec'}?'/'.$env{'request.course.sec'}:''))) &&
               (!&Apache::lonnet::allowed('vgb',$env{'request.course.id'}.
                                                '/'.$group))) { 
                 &print_end_page($r,$target);
                 return OK;   
            }
        }
    } else {
        $allowed=&Apache::lonnet::allowed('mdc',$env{'request.course.id'});
    }

    my $privileged=$allowed;
    if (($syllabus{'uploaded.lastmodified'}) && (!$forceedit)) {
 	$forcestudent='student';
    }
    if ($target ne 'tex') { $r->print('<table><tr><td>'); }
      if ($forcestudent or $target eq 'tex') { $allowed=0; }
 
      if ($allowed) {
          my $query_str = 'forcestudent=1';
          if (($group ne '') && ($env{'form.group'} eq $group)) {
              $query_str.='&amp;group='.$group.'&amp;'.$refarg;
          }
          $r->print(
	  '<p>'.
&Apache::loncommon::help_open_topic('Uploaded_Templates_TextBoxes','Help with filling in text boxes').'<br /><a href="'.$r->uri.'?'.$query_str.'"><font size="+1">'.&mt('Show Student View').'</font></a>'.
 &Apache::loncommon::help_open_topic('Uploaded_Templates_PublicView').'</p>');
      }  elsif ($privileged and $target ne 'tex') {
          my $query_str = 'forceedit=edit';
          if (($group ne '') && ($env{'form.group'} eq $group)) {
              $query_str.='&amp;group='.$group.'&amp;'.$refarg;
          }
	  $r->print('<a href="'.$r->uri.'?'.$query_str.'"><font size="+1">'
		    .&mt('Edit').'</font></a>');
      } 

      if (($env{'form.uploaddoc.filename'}) &&
          ($env{'form.storeupl'}) && ($allowed)) {
 	  if ($env{'form.uploaddoc.filename'}=~/\.(gif|jpg|png|jpeg)$/i) {
	      if ($syllabus{'uploaded.photourl'}) {
		  &Apache::lonnet::removeuploadedurl($syllabus{'uploaded.photourl'});
	      }
              if ($group ne '') {
	          $syllabus{'uploaded.photourl'}=
		      &Apache::lonnet::userfileupload('uploaddoc',1,
                                                      'bulletin/'.$group.'/'.$marker);
              } else {
                  $syllabus{'uploaded.photourl'}=
                      &Apache::lonnet::userfileupload('uploaddoc',1,
                                                      'bulletin/'.$marker);
              }
 	  }
          $syllabus{'uploaded.lastmodified'}=time;
          &Apache::lonnet::put('bulletinpage_'.$marker,\%syllabus,$dom,$crs);
       }
       if (($allowed) && ($env{'form.storesyl'})) {
	   foreach my $syl_field (keys(%syllabusfields)) {
               my $field=$env{'form.'.$syl_field};
               $field=~s/\s+$//s;
               $field=&Apache::lonfeedback::clear_out_html($field,1);
	       $syllabus{$syl_field}=$field;
           }
           $syllabus{'uploaded.lastmodified'}=time;
           &Apache::lonnet::put('bulletinpage_'.$marker,\%syllabus,$dom,$crs);
       }

# ---------------------------------------------------------------- Get syllabus
    if (($syllabus{'uploaded.lastmodified'}) || ($allowed)) {
       if ($syllabus{'uploaded.photourl'}) {
	   &Apache::lonnet::allowuploaded('/adm/syllabus',
					  $syllabus{'uploaded.photourl'});
	   $r->print('<img src="'.$syllabus{'uploaded.photourl'}.
	       '" align="right" />');
       }
       if ($allowed) {
           $r->print(
	 '<form method="post" enctype="multipart/form-data">'.
 	 '<input type="hidden" name="forceedit" value="edit" />'.
         '<h3>'.&mt('Upload a Photo').'</h3>'.
         '<input type="file" name="uploaddoc" size="50">'.
         '<input type="submit" name="storeupl" value="'.&mt('Upload').'">'.
	 '</form><form method="post">');
       }
       foreach my $field (sort(keys(%syllabusfields))) {
          if (($syllabus{$field}) || ($allowed)) {
              my $message=$syllabus{$field};
	      &Apache::lonfeedback::newline_to_br(\$message);
	      $message
        =~s/(https*\:\/\/[^\s]+)/\<a href=\"$1\"\>\<tt\>$1\<\/tt\>\<\/a\>/g;
	      if ($allowed) {
		  $message=&Apache::lonspeller::markeduptext($message);
	      }
	      $message=&Apache::lontexconvert::msgtexconverted($message);
	      unless ($field eq 'aaa_title') {
		if (($field ne 'bbb_content') || ($allowed)) {
		    if ($target ne 'tex') {
			$r->print('<h3>'.$syllabusfields{$field}.'</h3>');
		    } else {
			$r->print('\\\\\textbf{'.$syllabusfields{$field}.'}\\\\');
		    }
		}
		if ($target ne 'tex') {
		    $r->print('<blockquote>'.
                              $message.'</blockquote>');
		} else {
		    $r->print(' '.&Apache::lonxml::xmlparse($r,'tex',$message).' ');
		}
                 if ($allowed) {
                $r->print('<br /><textarea cols="80" rows="10" name="'.$field.'">'.
			  &HTML::Entities::encode($syllabus{$field},'&"<>').
           '</textarea><input type="submit" name="storesyl" value="'.&mt('Save').'" />');
	        }
	    } else {
                if ($target ne 'tex') {
		    $r->print('<h1>'.$message.'</h1>');
		} else {
		    $r->print('\\\\\textbf{'.&Apache::lonxml::xmlparse($r,'tex',$message).'}\\\\');
		}
                if ($allowed) {
                 $r->print(
                '<br />'.&mt('Topic').'<br /><textarea cols="80" rows="2" name="'.$field.'">'.
			  &HTML::Entities::encode($syllabus{$field},'&"<>').
           '</textarea><input type="submit" name="storesyl" value="'.&mt('Store').'" />');
                }
            }
	  }
       }
       if ($allowed) {
	   $r->print('</form>');
       }
       if ($target ne 'tex') {$r->print('</p>');} else {$r->print('\\\\');}
    } else {
       $r->print('<p>'.&mt('No page information provided.').'</p>');
    }
    if ($target ne 'tex') { $r->print('</td></tr></table>'); }
    if ($target ne 'tex') {
	$r->print(&Apache::lonfeedback::list_discussion
	           ('board','OPEN','bulletin___'.$marker.'___'.
	            $r->uri,undef,$group));
    } else {
	$r->print('\\\\'.&Apache::lonxml::xmlparse($r,'tex',&Apache::lonfeedback::list_discussion
	           ('board','OPEN','bulletin___'.$marker.'___'.
	            $r->uri,undef,$group)));
    }
    &print_end_page($r,$target);
    return OK;
}

sub print_end_page {
    my ($r,$target) = @_;
    if ($target ne 'tex') {
        $r->print(&Apache::loncommon::end_page());
    } else {
        $r->print('\end{document}');
    }
}

sub groupboard_breadcrumbs {
    my ($cdom,$cnum,$group,$refarg,$gpterm,$ucgpterm,$description,$boardurl,
        $boardtitle)= @_;
    &Apache::lonhtmlcommon::clear_breadcrumbs();
    if ($refarg ne '') {
        &Apache::lonhtmlcommon::add_breadcrumb
            ({href=>"/adm/coursegroups",
              text=>"Groups",
              title=>"View course groups"});
    }
    &Apache::lonhtmlcommon::add_breadcrumb
        ({href=>"/adm/$cdom/$cnum/$group/smppg?$refarg",
          text=>"$ucgpterm: $description",
          title=>"Go to group's home page"},
         {href=>"/adm/groupboards?group=$group&amp;$refarg",
          text=>"Discussion Boards",
          title=>"Display group discussion boards"},
         {href=>"$boardurl",
          text=>"$boardtitle",
          title=>"$boardtitle"},
        );
    my $output .= &Apache::lonhtmlcommon::breadcrumbs(&mt('[_1] discussion boards - [_2]',$gpterm,$description));
    return $output;
}

1;
__END__