# The LearningOnline Network
# Feedback
#
# $Id: lonfeedback.pm,v 1.99.2.11 2004/10/11 18:02:40 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::lonfeedback;

use strict;
use Apache::Constants qw(:common);
use Apache::lonmsg();
use Apache::loncommon();
use Apache::lontexconvert();
use Apache::lonlocal; # must not have ()
use Apache::lonhtmlcommon();
use Apache::lonnavmaps();

sub discussion_open {
    my ($status)=@_;
    if (defined($status) &&
	!($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER'
	  || $status eq 'OPEN')) {
	return 0;
    }
    my $close=&Apache::lonnet::EXT('resource.0.discussend');
    if (defined($close) && $close ne '' && $close < time) {
	return 0;
    }
    return 1;
}

sub discussion_visible {
    my ($status)=@_;
    if (not &discussion_open($status)) {
	my $hidden=&Apache::lonnet::EXT('resource.0.discusshide');
	if (lc($hidden) eq 'yes' or $hidden eq '' or !defined($hidden))  {
	    return 0;
	}
    }
    return 1;
}

sub list_discussion {
    my ($mode,$status,$symb)=@_;

    my $outputtarget=$ENV{'form.grade_target'};
    if (not &discussion_visible($status)) { return ''; }
    my @bgcols = ("#cccccc","#eeeeee");
    my $discussiononly=0;
    if ($mode eq 'board') { $discussiononly=1; }
    unless ($ENV{'request.course.id'}) { return ''; }
    my $crs='/'.$ENV{'request.course.id'};
    if ($ENV{'request.course.sec'}) {
	$crs.='_'.$ENV{'request.course.sec'};
    }                 
    $crs=~s/\_/\//g;
    unless ($symb) {
	$symb=&Apache::lonnet::symbread();
    }
    unless ($symb) { return ''; }

# backward compatibility (bulletin boards used to be 'wrapped')
    my $ressymb=$symb;
    if ($mode eq 'board') {
        unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
            $ressymb=~s|(bulletin___\d+___)|$1adm/wrapper|;
        }
    }

# Get discussion display settings for this discussion
    my $lastkey = $ressymb.'_lastread';
    my $showkey = $ressymb.'_showonlyunread';
    my $ondispkey = $ressymb.'_markondisp';
    my %dischash = &Apache::lonnet::get('nohist_'.$ENV{'request.course.id'}.'_discuss',[$lastkey,$showkey,$ondispkey],$ENV{'user.domain'},$ENV{'user.name'});
    my %discinfo = ();
    my $showonlyunread = 0;
    my $markondisp = 0;
    my $prevread = 0;
    my $previous = 0;
    my $newpostsflag = 0;

# Retain identification of "NEW" posts identified in last display, if continuing 'previous' browsing of posts.
    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['previous']);
    $previous = $ENV{'form.previous'};
    if ($previous > 0) {
        $prevread = $previous;
    } elsif (defined($dischash{$lastkey})) {
        unless ($dischash{$lastkey} eq '') {
            $prevread = $dischash{$lastkey};
        }
    }

# Get discussion display default settings for user
    if ($ENV{'environment.discdisplay'} eq 'unread') {
        $showonlyunread = 1;
    }
    if ($ENV{'environment.discmarkread'} eq 'ondisp') {
        $markondisp = 1;
    }

# Override user's default if user specified display setting for this discussion
    if (defined($dischash{$ondispkey})) {
	unless ($dischash{$showkey} eq '') {
	    $markondisp = $dischash{$ondispkey};
	}
    }
    if ($markondisp) {
        $discinfo{$lastkey} = time;
    }

    if (defined($dischash{$showkey})) {
	unless ($dischash{$showkey} eq '') {
	    $showonlyunread = $dischash{$showkey};
	}
    }

    my $seeid=&Apache::lonnet::allowed('rin',$crs);
    my $viewgrades=(&Apache::lonnet::allowed('vgr',$crs)
	&& ($symb=~/\.(problem|exam|quiz|assess|survey|form)$/));
    my @discussionitems=();
    my %contrib=&Apache::lonnet::restore($ressymb,$ENV{'request.course.id'},
			  $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
			  $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
    my $visible=0;
    my @depth=();
    my @original=();
    my @index=();
    my @replies=();
    my %alldiscussion=();
    my %notshown = ();
    my %newitem = ();
    my $maxdepth=0;

    my $target='';
    unless ($ENV{'browser.interface'} eq 'textual' ||
	    $ENV{'environment.remote'} eq 'off' ) {
	$target='target="LONcom"';
    }
    
    my $now = time;
    if (%discinfo) {
	&Apache::lonnet::put('nohist_'.$ENV{'request.course.id'}.'_discuss',\%discinfo,$ENV{'user.domain'},$ENV{'user.name'});
    }

    if ($contrib{'version'}) {
        my $oldest = $contrib{'1:timestamp'};
        if ($prevread eq '0') {
            $prevread = $oldest-1;
        }
	for (my $id=1;$id<=$contrib{'version'};$id++) {
	    my $idx=$id;
            my $posttime = $contrib{$idx.':timestamp'};
            if ($prevread <= $posttime) {
                $newpostsflag = 1;
            }
	    my $hidden=($contrib{'hidden'}=~/\.$idx\./);
	    my $deleted=($contrib{'deleted'}=~/\.$idx\./);
	    my $origindex='0.';
	    if (($contrib{$idx.':replyto'}) && ($ENV{'environment.threadeddiscussion'})) {
# this is a follow-up message
		$original[$idx]=$original[$contrib{$idx.':replyto'}];
		$depth[$idx]=$depth[$contrib{$idx.':replyto'}]+1;
		$origindex=$index[$contrib{$idx.':replyto'}];
		if ($depth[$idx]>$maxdepth) { $maxdepth=$depth[$idx]; }
	    } else {
# this is an original message
		$original[$idx]=0;
		$depth[$idx]=0;
	    }
	    if ($replies[$depth[$idx]]) {
		$replies[$depth[$idx]]++;
	    } else {
		$replies[$depth[$idx]]=1;
	    }
	    unless ((($hidden) && (!$seeid)) || ($deleted)) {
		$visible++;
		my $message=$contrib{$idx.':message'};
		$message=~s/\n/\<br \/\>/g;
		$message=&Apache::lontexconvert::msgtexconverted($message);
                my $subject=$contrib{$idx.':subject'};
                if (defined($subject)) {
                    $subject=~s/\n/\<br \/\>/g;
                    $subject=&Apache::lontexconvert::msgtexconverted($subject);
                }
		if ($contrib{$idx.':attachmenturl'}) {
		    my ($fname)
                        =($contrib{$idx.':attachmenturl'}=~m|/([^/]+)$|);
		    &Apache::lonnet::allowuploaded('/adm/feedback',
					   $contrib{$idx.':attachmenturl'});
		    $message.='<p>'.&mt('Attachment').
			': <a href="'.$contrib{$idx.':attachmenturl'}.'"><tt>'.
			$fname.'</tt></a></p>';
		}
		if ($message) {
		    if ($hidden) {
			$message='<font color="#888888">'.$message.'</font>';
		    }
#		    my $screenname=&Apache::loncommon::screenname(
#					    $contrib{$idx.':sendername'},
#					    $contrib{$idx.':senderdomain'});
#		    my $plainname=&Apache::loncommon::nickname(
#					    $contrib{$idx.':sendername'},
#					    $contrib{$idx.':senderdomain'});
		    my ($screenname,$plainname)=($contrib{$idx.':screenname'},
						 $contrib{$idx.':plainname'});
		    my $sender=&mt('Anonymous');
		    if ((!$contrib{$idx.':anonymous'}) || ($seeid)) {
			$sender=&Apache::loncommon::aboutmewrapper(
					 $plainname,
					 $contrib{$idx.':sendername'},
					 $contrib{$idx.':senderdomain'}).' ('.
					 $contrib{$idx.':sendername'}.' at '.
					 $contrib{$idx.':senderdomain'}.')';
			if ($contrib{$idx.':anonymous'}) {
			    $sender.=' ['.&mt('anonymous').'] '.
				$screenname;
			}
			if ($seeid) {
			    if ($hidden) {
				$sender.=' <a href="/adm/feedback?unhide='.
				    $ressymb.':::'.$idx;
                                if ($newpostsflag) {
                                    $sender .= '&previous='.$prevread;
                                }
                                $sender .= '">'.&mt('Make Visible').'</a>';
			    } else {
				$sender.=' <a href="/adm/feedback?hide='.
				    $ressymb.':::'.$idx;
                                if ($newpostsflag) {
                                    $sender .= '&previous='.$prevread;
                                }
                                $sender .= '">'.&mt('Hide').'</a>';
			    }                     
			    $sender.=' <a href="/adm/feedback?deldisc='.
				$ressymb.':::'.$idx;
                                if ($newpostsflag) {
                                    $sender .= '&previous='.$prevread;
                                }
                                $sender .= '">'.&mt('Delete').'</a>';
			}
		    } else {
			if ($screenname) {
			    $sender='<i>'.$screenname.'</i>';
			}
		    }
		    if (&discussion_open($status) &&
			&Apache::lonnet::allowed('pch',
						 $ENV{'request.course.id'}.
						 ($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {
			$sender.=' <a href="/adm/feedback?replydisc='.
			    $ressymb.':::'.$idx;
                        if ($newpostsflag) {
                            $sender .= '&previous='.$prevread;
                        }
                        $sender .= '" '.$target.'>'.&mt('Reply').'</a>';
		    }
		    my $vgrlink;
		    if ($viewgrades) {
			$vgrlink=&Apache::loncommon::submlink('Submissions',
            $contrib{$idx.':sendername'},$contrib{$idx.':senderdomain'},$symb);
		    }
#figure out at what position this needs to print
		    my $thisindex=$idx;
		    if ($ENV{'environment.threadeddiscussion'}) {
			$thisindex=$origindex.substr('00'.$replies[$depth[$idx]],-2,2);	
		    }
		    $alldiscussion{$thisindex}=$idx;
		    $index[$idx]=$thisindex;
                    my $spansize = 2;
                    if ($showonlyunread && $prevread > $posttime) {
                        $notshown{$idx} = 1;
                    } else {
                        if ($prevread > 0 && $prevread <= $posttime) {
                            $newitem{$idx} = 1;
                            $discussionitems[$idx] .= '
                             <p><table border="0" width="100%">
                              <tr><td align="left"><font color="#FF0000"><b>NEW</b></font></td>';
                        } else {
                            $newitem{$idx} = 0;
                            $discussionitems[$idx] .= '
                             <p><table border="0" width="100%">
                              <tr><td align="left">&nbsp;</td>';
                        }
                        $discussionitems[$idx] .= '<td align ="left">&nbsp;&nbsp;'.
                            '<b>'.$subject.'</b>&nbsp;&nbsp;'.
                            $sender.'</b> '.$vgrlink.' ('.
                            localtime($posttime).')</td></tr>'.
                            '</table><blockquote>'.$message.'</blockquote></p>';
                    }
                }
            }
	}
    }

    my $discussion='';

    my $function = &Apache::loncommon::get_users_function();
    my $color = &Apache::loncommon::designparm($function.'.tabbg',
                                                    $ENV{'user.domain'});
    my %lt = &Apache::lonlocal::texthash(
        'cuse' => 'Current discussion settings',
        'allposts' => 'All posts',
        'unread' => 'New posts only',
        'ondisp' => 'Once displayed',
        'onmark' => 'Once marked read',
        'disa' => 'Posts to be displayed',
        'npce' => 'Posts cease to be marked "NEW"',
        'chgt' => 'Change',
        'disp' => 'Display',
        'nolo' => 'Not new',
    );

    my $currdisp = $lt{'allposts'};
    my $currmark = $lt{'onmark'};
    my $dispchange = $lt{'unread'};
    my $markchange = $lt{'ondisp'};
    my $chglink = '/adm/feedback?modifydisp='.$ressymb;
    my $displink = 'onlyunread';
    my $marklink = 'markondisp';

    if ($markondisp) {
        $currmark = $lt{'ondisp'};
        $markchange = $lt{'onmark'};
        $marklink = 'markonread';
    }

    if ($showonlyunread) {
        $currdisp = $lt{'unread'};
        $dispchange = $lt{'allposts'};
        $displink = 'allposts';
    }
   
    $chglink .= '&changes='.$displink.'_'.$marklink;

    if ($newpostsflag) {
        $chglink .= '&previous='.$prevread;
    }

    if ($visible) {
# Print the discusssion
	if ($outputtarget ne 'tex') {
            my $colspan=$maxdepth+1;
	    $discussion.='<table bgcolor="#AAAAAA" cellpadding="2" cellspacing="2" border="0">';
	    $discussion .='<tr><td bgcolor="#DDDDBB" colspan="'.$colspan.'">'.
		'<table border="0" width="100%" bgcolor="#DDDDBB"><tr>';
	    if ($visible>2) {
		$discussion.='<td align="left">'.
		    '<a href="/adm/feedback?threadedon='.$ressymb;
		if ($newpostsflag) {
		    $discussion .= '&previous='.$prevread;
		}
		$discussion .='">'.&mt('Threaded View').'</a>&nbsp;&nbsp;'.
		    '<a href="/adm/feedback?threadedoff='.$ressymb;
		if ($newpostsflag) {
		    $discussion .= '&previous='.$prevread;
		}
		$discussion .='">'.&mt('Chronological View').'</a>&nbsp;&nbsp;</td>';
	    }
	    if ($newpostsflag) {
		if (!$markondisp) {
		    $discussion .='<td align="right"><a href="/adm/feedback?markread='.$ressymb.'">'.&mt('Mark new posts as read').'</a>&nbsp;&nbsp;';
		} else {
		    $discussion .= '<td>&nbsp;</td>';
		}
	    } else {
		$discussion .= '<td>&nbsp;</td>';
	    }
	    $discussion .= '</tr></table></td></tr>';
	} else {
	    $discussion.='\vskip 0 mm\noindent\makebox[2 cm][b]{\hrulefill}'.
                         '\textbf{DISCUSSIONS}\makebox[2 cm][b]{\hrulefill}'.
                         '\vskip 0 mm\noindent\textbf{'.$lt{'cuse'}.'}:\vskip 0 mm'.
                         '\noindent\textbf{'.$lt{'disa'}.'}: \textit{'.$currdisp.'}\vskip 0 mm'.
                         '\noindent\textbf{'.$lt{'npce'}.'}: \textit{'.$currmark.'}';
	}
        my $numhidden = keys %notshown;
        if ($numhidden > 0) {
            my $colspan = $maxdepth+1;
            $discussion.="\n".'<tr><td bgcolor="#CCCCCC" colspan="'.$colspan.'">'.
                         '<a href="/adm/feedback?allposts='.$ressymb;
            if ($newpostsflag) {
                $discussion .= '&previous='.$prevread;
            }
            $discussion .= '">'.&mt('Show all posts').'</a> '.&mt('to display').' '.
                         $numhidden.' '.&mt('previously viewed posts').
                         '<br/></td></tr>';
        }
	foreach (sort { $a <=> $b } keys %alldiscussion) {
            unless ($notshown{$alldiscussion{$_}} eq '1') {
                if ($outputtarget ne 'tex') {
		    $discussion.="\n<tr>";
		} else {
		    $discussion.='\vskip 0 mm\noindent\makebox[2 cm][b]{\hrulefill}';
		}
	        my $thisdepth=$depth[$alldiscussion{$_}];
                if ($outputtarget ne 'tex') {
		    for (1..$thisdepth) {
			$discussion.='<td>&nbsp;&nbsp;&nbsp;</td>';
		    }
		}
	        my $colspan=$maxdepth-$thisdepth+1;
                if ($outputtarget ne 'tex') {
		    $discussion.='<td  bgcolor="'.$bgcols[$newitem{$alldiscussion{$_}}].'" colspan="'.$colspan.'">'.
                             $discussionitems[$alldiscussion{$_}].
	                     '</td></tr>';
		} else {
		    #cleanup block
		    $discussionitems[$alldiscussion{$_}]=~s/<table([^>]*)>/<table TeXwidth="90 mm">/;
		    $discussionitems[$alldiscussion{$_}]=~s/<tr([^>]*)><td([^>]*)>/<tr><td TeXwidth="20 mm" align="left">/;
                    my $threadinsert='';
                    if ($thisdepth > 0) {
			$threadinsert='<br /><strong>Reply: '.$thisdepth.'</strong>';
		    }
		    $discussionitems[$alldiscussion{$_}]=~s/<\/td><td([^>]*)>/$threadinsert<\/td><td TeXwidth="65 mm" align="left">/;
		    $discussionitems[$alldiscussion{$_}]=~s/<a([^>]+)>(Hide|Delete|Reply|Submissions)<\/a>//g;
                    $discussionitems[$alldiscussion{$_}]=~s/(<b>|<\/b>|<\/a>|<a([^>]+)>)//g;
		    
                    #FIXME xmlparse can't be safely called from inside xmlparse
                    #   due to the global variables that are use, the safe
                    #   space etc. I expect this has unforseen issues that
                    #   need resolving.
		    
                    $discussion.=&Apache::lonxml::xmlparse('','tex',$discussionitems[$alldiscussion{$_}]);
		}
	    }
        }
	if ($outputtarget ne 'tex') {
            my $colspan=$maxdepth+1;
            $discussion .= <<END; 
            <tr bgcolor="#FFFFFF">
             <td colspan="$colspan" valign="top">
              <table border="0" bgcolor="#FFFFFF" width="100%" cellspacing="2" cellpadding="2">
               <tr>
                <td align="left">
                 <table border="0" cellpadding="0" cellspacing="4">
                  <tr>
                   <td>
                    <font size="-1"><b>$lt{'cuse'}</b>:</td>
                   <td>&nbsp;</td>
END
            if ($newpostsflag) {
                $discussion .= 
                   '<td><font size="-1">1.&nbsp;'.$lt{'disp'}.'&nbsp;-&nbsp;<i>'.$currdisp.'</i>&nbsp;&nbsp;2.&nbsp;'.$lt{'nolo'}.'&nbsp;-&nbsp;<i>'.$currmark.'</i></font></td>';
            } else {
                $discussion .=
                   '<td><font size="-1">'.$lt{'disp'}.'&nbsp;-&nbsp;<i>'.$currdisp.'</i></font></td>';
            }
            $discussion .= <<END;
                   <td>&nbsp;</td>
                   <td>
                    <font size="-1"><b><a href="$chglink">$lt{'chgt'}</a>?</font></b></td>
                  </tr>
                 </table>
                </td>
               </tr>
              </table>
             </td>
            </tr>
           </table>
           <br /><br />
END
	}
    }
    if ($discussiononly) {
	$discussion.=(<<ENDDISCUSS);
<form action="/adm/feedback" method="post" name="mailform" enctype="multipart/form-data">
<input type="submit" name="discuss" value="Post Discussion" />
<input type="submit" name="anondiscuss" value="Post Anonymous Discussion" />
<input type="hidden" name="symb" value="$ressymb" />
<input type="hidden" name="sendit" value="true" />
<br />
<font size="1">Note: in anonymous discussion, your name is visible only to
course faculty</font><br />
<b>Title:</b>&nbsp;<input type="text" name="subject" value="" size="30" /><br /><br />
<textarea name="comment" cols="80" rows="14" wrap="hard"></textarea>
<p>
Attachment (128 KB max size): <input type="file" name="attachment" />
</p>
</form>
ENDDISCUSS
        if ($outputtarget ne 'tex') {
	    $discussion.=&generate_preview_button();
	}
    } else {
	if (&discussion_open($status) &&
	    &Apache::lonnet::allowed('pch',
				   $ENV{'request.course.id'}.
	($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {
	    if ($outputtarget ne 'tex') {
		$discussion.='<table bgcolor="#BBBBBB"><tr><td><a href="/adm/feedback?replydisc='.
		    $symb.':::" '.$target.'>'.
		    '<img src="/adm/lonMisc/chat.gif" border="0" />'.
		    &mt('Post Discussion').'</a></td></tr></table>';
	    }
			}
    }
   return $discussion;
}

sub mail_screen {
  my ($r,$feedurl,$options) = @_;
  my $bodytag=&Apache::loncommon::bodytag('Resource Feedback and Discussion',
                                          '','onLoad="window.focus();"');
  my $title=&Apache::lonnet::gettitle($feedurl);
  if (!$title) { $title = $feedurl; }
  my $quote='';
  my $subject = '';
  my $prevtag = '';
  if ($ENV{'form.replydisc'}) {
      my ($symb,$idx)=split(/\:\:\:/,$ENV{'form.replydisc'});
      my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
					   $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
					   $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
      unless (($contrib{'hidden'}=~/\.$idx\./) || ($contrib{'deleted'}=~/\.$idx\./)) {
	  my $message=$contrib{$idx.':message'};
	  $message=~s/\n/\<br \/\>/g;
	  $quote='<blockquote>'.&Apache::lontexconvert::msgtexconverted($message).'</blockquote>';
          if ($idx > 0) {
              $subject = 'Re: '.$contrib{$idx.':subject'};
          }
      }
      if ($ENV{'form.previous'}) {
          $prevtag = '<input type="hidden" name="previous" value="'.$ENV{'form.previous'}.'" />';
      }
  }
  my $latexHelp=&Apache::loncommon::helpLatexCheatsheet();
  my $htmlheader=&Apache::lonhtmlcommon::htmlareaheaders();
  my $send=&mt('Send');
  $r->print(<<ENDDOCUMENT);
<html>
<head>
<title>The LearningOnline Network with CAPA</title>
<meta http-equiv="pragma" content="no-cache"></meta>
$htmlheader
<script type="text/javascript">
//<!--
    function gosubmit() {
        var rec=0;
        if (typeof(document.mailform.elements.author)!="undefined") {
          if (document.mailform.elements.author.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.question)!="undefined") {
          if (document.mailform.elements.question.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.course)!="undefined") {
          if (document.mailform.elements.course.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.policy)!="undefined") {
          if (document.mailform.elements.policy.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.discuss)!="undefined") {
          if (document.mailform.elements.discuss.checked) {
             rec=1;
          } 
        }
        if (typeof(document.mailform.elements.anondiscuss)!="undefined") {
          if (document.mailform.elements.anondiscuss.checked) {
             rec=1;
          } 
        }

        if (rec) {
            if (typeof(document.mailform.onsubmit)=='function') {
		document.mailform.onsubmit();
	    }
	    document.mailform.submit();
        } else {
            alert('Please check a feedback type.');
	}
    }
//-->
</script>
</head>
$bodytag
<h2><tt>$title</tt></h2>
<form action="/adm/feedback" method="post" name="mailform"
enctype="multipart/form-data">
$prevtag
<input type="hidden" name="postdata" value="$feedurl" />
<input type="hidden" name="replydisc" value="$ENV{'form.replydisc'}" />
Please check at least one of the following feedback types:
$options<hr />
$quote
<p>My question/comment/feedback:</p>
<p>
$latexHelp
Title: <input type="text" name="subject" size="30" value="$subject" /></p>
<p>
<textarea name="comment" id="comment" cols="60" rows="10" wrap="hard">
</textarea></p>
<p>
Attachment (128 KB max size): <input type="file" name="attachment" />
</p>
<p>
<input type="hidden" name="sendit" value="1" />
<input type="button" value="$send" onClick='gosubmit();' />
</p>
</form>
ENDDOCUMENT
$r->print(&generate_preview_button().
&Apache::lonhtmlcommon::htmlareaselectactive('comment').
'</body></html>');
}

sub print_display_options {
    my ($r,$symb,$previous,$dispchg,$markchg,$feedurl) = @_;
 # backward compatibility (bulletin boards used to be 'wrapped')
    if ($feedurl=~m|^/adm/wrapper/adm/.*/bulletinboard$|) {
        $feedurl=~s|^/adm/wrapper||;
    }

    my $function = &Apache::loncommon::get_users_function();
    my $tabcolor = &Apache::loncommon::designparm($function.'.tabbg',
                                                    $ENV{'user.domain'});
    my $bodytag=&Apache::loncommon::bodytag('Discussion options',
                                          '','');

    my %lt = &Apache::lonlocal::texthash(
        'dido' => 'Discussion display options',
        'pref' => 'Display Preference',
        'curr' => 'Current setting ',
        'actn' => 'Action',
        'deff' => 'Default for all discussions',
        'prca' => 'Preferences can be set for this discussion that determine ....',
        'whpo' => 'Which posts are displayed when you display this bulletin board or resource, and',
        'unwh' => 'Under what circumstances posts are identfied as "New."',
        'allposts' => 'All posts',
        'unread' => 'New posts only',
        'ondisp' => 'Once displayed',
        'onmark' => 'Once marked as read',
        'disa' => 'Posts displayed?',
        'npmr' => 'New posts cease to be identified as "New"?',
        'chgt' => 'Change to ',
        'mkdf' => 'Set to ',
        'yhni' => 'You have not indicated that you wish to change either of the discussion settings',
        'ywbr' => 'You will be returned to the previous page if you click OK.'
    );

    my $dispchange = $lt{'unread'};
    my $markchange = $lt{'ondisp'};
    my $currdisp = $lt{'allposts'};
    my $currmark = $lt{'onmark'};
    my $discdisp = 'allposts';
    my $discmark = 'onmark';
                                                                                      
    if ($dispchg eq 'allposts') {
        $dispchange = $lt{'allposts'};
        $currdisp = $lt{'unread'};
        $discdisp = 'unread';
    }
                                                                                      
    if ($markchg eq 'markonread') {
        $markchange = $lt{'onmark'};
        $currmark = $lt{'ondisp'};
        $discmark = 'ondisp';
    }
    $r->print(<<END);
<html>
<head>
<title>$lt{'dido'}</title>
<meta http-equiv="pragma" content="no-cache" />
<script>
function setDisp() {
    var prev = "$previous"
    var chktotal = 0
    if (document.modifydisp.discdisp.checked == true) {
        document.modifydisp.$dispchg.value = "$symb"
        chktotal ++
    }
    if (document.modifydisp.discmark.checked == true) {
        document.modifydisp.$markchg.value = "$symb"
        chktotal ++
    }
    if (chktotal > 0) { 
        document.modifydisp.submit()
    } else {
        if(confirm("$lt{'yhni'}. \\n$lt{'ywbr'}"))      {
            if (prev > 0) {
                location.href = "$feedurl?previous=$previous"
            } else {
                location.href = "$feedurl"
            }
        }
    }
}
</script>
</head>
$bodytag
<form name="modifydisp" method="post" action="/adm/feedback">
$lt{'sdpf'}<br/> $lt{'prca'}  <ol><li>$lt{'whpo'}</li><li>$lt{'unwh'}</li></ol>
<br />
<table border="0" cellpadding="0" cellspacing="0">
 <tr>
  <td width="100%" bgcolor="#000000">
   <table width="100%" border="0" cellpadding="1" cellspacing="0">
    <tr>
     <td width="100%" bgcolor="#000000">
      <table border="0" cellpadding="3" cellspacing="1" bgcolor="#FFFFFF">
       <tr bgcolor="$tabcolor">
        <td><b>$lt{'pref'}</b></td>
        <td><b>$lt{'curr'}</b></td>
        <td><b>$lt{'actn'}?</b></td>
       </tr>
       <tr bgcolor="#dddddd">
       <td>$lt{'disa'}</td>
       <td>$lt{$discdisp}</td>
       <td><input type="checkbox" name="discdisp" />&nbsp;$lt{'chgt'} "$dispchange"</td>
      </tr><tr bgcolor="#eeeeee">
       <td>$lt{'npmr'}</td>
       <td>$lt{$discmark}</td>
       <td><input type="checkbox" name="discmark" />$lt{'chgt'} "$markchange"</td>
      </tr>
     </table>
    </td>
   </tr>
  </table>
 </td>
</tr>
</table>
<br />
<br />
<input type="hidden" name="previous" value="$previous" />
<input type="hidden" name="$dispchg" value=""/>
<input type="hidden" name="$markchg" value=""/>
<input type="button" name="sub" value="Store Changes" onClick="javascript:setDisp()" />
<br />
<br />
</form>
</body>
</html>
END
    return;
}

sub fail_redirect {
  my ($r,$feedurl) = @_;
  if ($feedurl=~/^\/adm\//) { $feedurl.='?register=1' };
  $r->print (<<ENDFAILREDIR);
<html>
<head><title>Feedback not sent</title>
<meta http-equiv="pragma" content="no-cache" />
<meta HTTP-EQUIV="Refresh" CONTENT="2; url=$feedurl" />
</head>
<body bgcolor="#FFFFFF">
<img align="right" src="/adm/lonIcons/lonlogos.gif" />
<b>Sorry, no recipients  ...</b>
<br /><a href="$feedurl">Continue</a>
</body>
</html>
ENDFAILREDIR
}

sub redirect_back {
  my ($r,$feedurl,$typestyle,$sendsomething,$sendposts,$status,$previous) = @_;
  my $prevtag = '';
  my $qrystr = '';
 # backward compatibility (bulletin boards used to be 'wrapped')
  if ($feedurl=~m|^/adm/wrapper/adm/.*/bulletinboard$|) {
      $feedurl=~s|^/adm/wrapper||;
  }

  if ($feedurl=~/^\/adm\//) { $feedurl.='?register=1' };
  if ($previous > 0) {
      $qrystr = 'previous='.$previous;
      if ($feedurl =~ /\?register=1/) {
          $feedurl .= '&'.$qrystr;
      } else {
          $feedurl .= '?'.$qrystr;
      }
      $prevtag = '<input type="hidden" name="previous" value="'.$previous.'" />';
  }
  $r->print (<<ENDREDIR);
<html>
<head>
<title>Feedback sent</title>
<meta http-equiv="pragma" content="no-cache" />
<meta HTTP-EQUIV="Refresh" CONTENT="2; url=$feedurl" />
</head>
<body bgcolor="#FFFFFF" onLoad='if (window.name!="loncapaclient") { this.document.reldt.submit(); self.close(); }'>
<img align="right" src="/adm/lonIcons/lonlogos.gif" />
$typestyle
<b>Sent $sendsomething message(s), and $sendposts post(s).</b>
<font color="red">$status</font>
<form name="reldt" action="$feedurl" target="loncapaclient">
$prevtag
</form>
<br /><a href="$feedurl">Continue</a>
</body>
</html>
ENDREDIR
}

sub no_redirect_back {
  my ($r,$feedurl) = @_;
  $r->print (<<ENDNOREDIR);
<html>
<head><title>Feedback not sent</title>
<meta http-equiv="pragma" content="no-cache" />
ENDNOREDIR

  if ($feedurl!~/^\/adm\/feedback/) { 
    $r->print('<meta HTTP-EQUIV="Refresh" CONTENT="2; url='.$feedurl.'">');
  }
  
  $r->print (<<ENDNOREDIRTWO);
</head>
<body bgcolor="#FFFFFF" onLoad='if (window.name!="loncapaclient") { self.close(); }'>
<img align="right" src="/adm/lonIcons/lonlogos.gif" />
<b>Sorry, no feedback possible on this resource  ...</b>
<br /><a href="$feedurl">Continue</a>
</body>
</html>
ENDNOREDIRTWO
}

sub screen_header {
    my ($feedurl) = @_;
    my $msgoptions='';
    my $discussoptions='';
    unless ($ENV{'form.replydisc'}) {
	if (($feedurl=~/^\/res\//) && ($feedurl!~/^\/res\/adm/)) {
	    $msgoptions= 
		'<p><input type="checkbox" name="author" /> '.
		&mt('Feedback to resource author').'</p>';
	}
	if (&feedback_available(1)) {
	    $msgoptions.=
		'<br /><input type="checkbox" name="question" /> '.
		&mt('Question about resource content');
	}
	if (&feedback_available(0,1)) {
	    $msgoptions.=
		'<br /><input type="checkbox" name="course" /> '.
		&mt('Question/Comment/Feedback about course content');
	}
	if (&feedback_available(0,0,1)) {
	    $msgoptions.=
		'<br /><input type="checkbox" name="policy" /> '.
		&mt('Question/Comment/Feedback about course policy');
	}
    }
    if ($ENV{'request.course.id'}) {
	if (&discussion_open() &&
	    &Apache::lonnet::allowed('pch',
				     $ENV{'request.course.id'}.
				     ($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {
	    $discussoptions='<input type="checkbox" name="discuss" onClick="this.form.anondiscuss.checked=false;" '.
		($ENV{'form.replydisc'}?' checked="1"':'').' /> '.
		&mt('Contribution to course discussion of resource');
	    $discussoptions.='<br /><input type="checkbox" name="anondiscuss" onClick="this.form.discuss.checked=false;" /> '.
		&mt('Anonymous contribution to course discussion of resource').
		' <i>('.&mt('name only visible to course faculty').')</i>';
      }
    }
    if ($msgoptions) { $msgoptions='<h2><img src="/adm/lonMisc/feedback.gif" />'.&mt('Sending Messages').'</h2>'.$msgoptions; }
    if ($discussoptions) { 
	$discussoptions='<h2><img src="/adm/lonMisc/chat.gif" />'.&mt('Discussion Contributions').'</h2>'.$discussoptions; }
    return $msgoptions.$discussoptions;
}

sub resource_output {
  my ($feedurl) = @_;
  my $usersaw=&Apache::lonnet::ssi_body($feedurl);
  $usersaw=~s/\<body[^\>]*\>//gi;
  $usersaw=~s/\<\/body\>//gi;
  $usersaw=~s/\<html\>//gi;
  $usersaw=~s/\<\/html\>//gi;
  $usersaw=~s/\<head\>//gi;
  $usersaw=~s/\<\/head\>//gi;
  $usersaw=~s/action\s*\=/would_be_action\=/gi;
  return $usersaw;
}

sub clear_out_html {
  my ($message,$override)=@_;
  unless (&Apache::lonhtmlcommon::htmlareablocked()) { return $message; }
  my $cid=$ENV{'request.course.id'};
  if (($ENV{"course.$cid.allow_limited_html_in_feedback"} =~ m/yes/i) ||
      ($override)) {
      # allows <B> <I> <P> <A> <LI> <OL> <UL> <EM> <BR> <TT> <STRONG> 
      # <BLOCKQUOTE> <DIV .*> <DIV> <IMG> <M> <SPAN> <H1> <H2> <H3> <H4> <SUB>
      # <SUP>
      my %html=(B=>1, I=>1, P=>1, A=>1, LI=>1, OL=>1, UL=>1, EM=>1,
		BR=>1, TT=>1, STRONG=>1, BLOCKQUOTE=>1, DIV=>1, IMG=>1,
                M=>1, SUB=>1, SUP=>1, SPAN=>1, 
		H1=>1, H2=>1, H3=>1, H4=>1, H5=>1);

      $message =~ s/\<(\/?\s*(\w+)[^\>\<]*)/
	  {($html{uc($2)}&&(length($1)<1000))?"\<$1":"\&lt;$1"}/ge;
      $message =~ s/(\<?\s*(\w+)[^\<\>]*)\>/
	  {($html{uc($2)}&&(length($1)<1000))?"$1\>":"$1\&gt;"}/ge;
  } else {
      $message=~s/\</\&lt\;/g;
      $message=~s/\>/\&gt\;/g;
  }
  return $message;
}

sub assemble_email {
  my ($feedurl,$message,$prevattempts,$usersaw,$useranswer)=@_;
  my $email=<<"ENDEMAIL";
Refers to <a href="$feedurl">$feedurl</a>

$message
ENDEMAIL
    my $citations=<<"ENDCITE";
<h2>Previous attempts of student (if applicable)</h2>
$prevattempts
<br /><hr />
<h2>Original screen output (if applicable)</h2>
$usersaw
<h2>Correct Answer(s) (if applicable)</h2>
$useranswer
ENDCITE
  return ($email,$citations);
}

sub secapply {
    my $rec=shift;
    my $defaultflag=shift;
    $rec=~s/\s+//g;
    $rec=~s/\@/\:/g;
    my ($adr,$sections)=($rec=~/^([^\(]+)\(([^\)]+)\)/);
    if ($sections) {
	foreach (split(/\;/,$sections)) {
            if (($_ eq $ENV{'request.course.sec'}) ||
                ($defaultflag && ($_ eq '*'))) {
                return $adr; 
            }
        }
    } else {
       return $rec;
    }
    return '';
}

sub decide_receiver {
  my ($feedurl,$author,$question,$course,$policy,$defaultflag) = @_;
  my $typestyle='';
  my %to=();
  if ($ENV{'form.author'}||$author) {
    $typestyle.='Submitting as Author Feedback<br>';
    $feedurl=~/^\/res\/(\w+)\/(\w+)\//;
    $to{$2.':'.$1}=1;
  }
  if ($ENV{'form.question'}||$question) {
    $typestyle.='Submitting as Question<br>';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.question.email'})
	     ) {
	my $rec=&secapply($_,$defaultflag);
        if ($rec) { $to{$rec}=1; }
    } 
  }
  if ($ENV{'form.course'}||$course) {
    $typestyle.='Submitting as Comment<br />';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'})
	     ) {
	my $rec=&secapply($_,$defaultflag);
        if ($rec) { $to{$rec}=1; }
    } 
  }
  if ($ENV{'form.policy'}||$policy) {
    $typestyle.='Submitting as Policy Feedback<br />';
    foreach (split(/\,/,
		   $ENV{'course.'.$ENV{'request.course.id'}.'.policy.email'})
	     ) {
	my $rec=&secapply($_,$defaultflag);
        if ($rec) { $to{$rec}=1; }
    } 
  }
  if ((scalar(%to) eq '0') && (!$defaultflag)) {
     ($typestyle,%to)=
	 &decide_receiver($feedurl,$author,$question,$course,$policy,1);
  }
  return ($typestyle,%to);
}

sub feedback_available {
    my ($question,$course,$policy)=@_;
    my ($typestyle,%to)=&decide_receiver('',0,$question,$course,$policy);
    return scalar(%to);
}

sub send_msg {
  my ($feedurl,$email,$citations,$attachmenturl,%to)=@_;
  my $status='';
  my $sendsomething=0;
  foreach (keys %to) {
    if ($_) {
      my $declutter=&Apache::lonnet::declutter($feedurl);
      unless (&Apache::lonmsg::user_normal_msg(split(/\:/,$_),
               'Feedback ['.$declutter.']',$email,$citations,$feedurl,
                $attachmenturl)=~/ok/) {
	$status.='<br />'.&mt('Error sending message to').' '.$_.'<br />';
      } else {
	$sendsomething++;
      }
    }
  }

    my %record=&Apache::lonnet::restore('_feedback');
    my ($temp)=keys %record;
    unless ($temp=~/^error\:/) {
       my %newrecord=();
       $newrecord{'resource'}=$feedurl;
       $newrecord{'subnumber'}=$record{'subnumber'}+1;
       unless (&Apache::lonnet::cstore(\%newrecord,'_feedback') eq 'ok') {
	   $status.='<br />'.&mt('Not registered').'<br />';
       }
    }
       
  return ($status,$sendsomething);
}

sub adddiscuss {
    my ($symb,$email,$anon,$attachmenturl,$subject)=@_;
    my $status='';
    if (&discussion_open() &&
	&Apache::lonnet::allowed('pch',$ENV{'request.course.id'}.
        ($ENV{'request.course.sec'}?'/'.$ENV{'request.course.sec'}:''))) {

    my %contrib=('message'      => $email,
                 'sendername'   => $ENV{'user.name'},
                 'senderdomain' => $ENV{'user.domain'},
                 'screenname'   => $ENV{'environment.screenname'},
                 'plainname'    => $ENV{'environment.firstname'}.' '.
		                   $ENV{'environment.middlename'}.' '.
                                   $ENV{'environment.lastname'}.' '.
                                   $ENV{'enrironment.generation'},
                 'attachmenturl'=> $attachmenturl,
                 'subject'      => $subject);
    if ($ENV{'form.replydisc'}) {
	$contrib{'replyto'}=(split(/\:\:\:/,$ENV{'form.replydisc'}))[1];
    }
    if ($anon) {
	$contrib{'anonymous'}='true';
    }
    if (($symb) && ($email)) {
       $status='Adding to class discussion'.($anon?' (anonymous)':'').': '.
        &Apache::lonnet::store(\%contrib,$symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
        my %storenewentry=($symb => time);
        $status.='<br />'.&mt('Updating discussion time').': '.
        &Apache::lonnet::put('discussiontimes',\%storenewentry,
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
    }
    my %record=&Apache::lonnet::restore('_discussion');
    my ($temp)=keys %record;
    unless ($temp=~/^error\:/) {
       my %newrecord=();
       $newrecord{'resource'}=$symb;
       $newrecord{'subnumber'}=$record{'subnumber'}+1;
       $status.='<br />'.&mt('Registering').': '.
               &Apache::lonnet::cstore(\%newrecord,'_discussion');
    }
    } else {
	$status.='Failed.';
    }
    return $status.'<br />';   
}

# ----------------------------------------------------------- Preview function

sub show_preview {
    my $r=shift;
    my $message=&clear_out_html($ENV{'form.comment'});
    $message=~s/\n/\<br \/\>/g;
    $message=&Apache::lontexconvert::msgtexconverted($message);
    my $subject=&clear_out_html($ENV{'form.subject'});
    $subject=~s/\n/\<br \/\>/g;
    $subject=&Apache::lontexconvert::msgtexconverted($subject);
    $r->print('<table border="2"><tr><td>'.
       '<b>Subject:</b> '.$subject.'<br /><br />'.
       $message.'</td></tr></table>');
}

sub generate_preview_button {
    my $pre=&mt("Show Preview");
    return(<<ENDPREVIEW);
<form name="preview" action="/adm/feedback?preview=1" method="post" target="preview">
<input type="hidden" name="subject">
<input type="hidden" name="comment" />
<input type="button" value="$pre"
onClick="if (typeof(document.mailform.onsubmit)=='function') {document.mailform.onsubmit();};this.form.comment.value=document.mailform.comment.value;this.form.subject.value=document.mailform.subject.value;this.form.submit();" />
</form>
ENDPREVIEW
}

sub has_discussion {
    my $resourcesref = shift;
    my $navmap = Apache::lonnavmaps::navmap->new();
    my @allres=$navmap->retrieveResources();
    foreach my $resource (@allres) {
	if ($resource->hasDiscussion()) {
	    my $ressymb;
	    if ($resource->symb() =~ m-(___adm/\w+/\w+)/(\d+)/bulletinboard$-) {
		$ressymb = 'bulletin___'.$2.$1.'/'.$2.'/bulletinboard';
	    } else {
		$ressymb = $resource->symb();
	    }
	    push @{$resourcesref}, $ressymb;
	}
    }
    $navmap->untieHashes();
    return;
}

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

# --------------------------- Get query string for limited number of parameters

  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
         ['hide','unhide','deldisc','postdata','preview','replydisc','threadedon','threadedoff','onlyunread','allposts','previous','markread','markonread','markondisp','modifydisp','changes','navtime','navurl']);
  if ($ENV{'form.navtime'}) {
      my %discinfo = ();
      my @resources = ();
      &has_discussion(\@resources);
      my $numitems = @resources;
      my $feedurl = '/adm/navmaps';
      if ($ENV{'form.navurl'}) {
          $feedurl .= '?'.$ENV{'form.navurl'};
      }
      my %lt = &Apache::lonlocal::texthash(
          'mnpa' => 'Marked "New" posts as read in a total of',
          'robb' => 'resources/bulletin boards.',
          'twnp' => 'There are currently no resources or bulletin boards with unread discussion postings.'
      );       
      foreach (@resources) {
# backward compatibility (bulletin boards used to be 'wrapped')
          my $ressymb=$_;
          if ($ressymb =~ m/bulletin___\d+___/) {
              unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
                  $ressymb=~s|(bulletin___\d+___)|$1adm/wrapper/|;
              }
          }
          my $lastkey = $ressymb.'_lastread';
          $discinfo{$lastkey} = $ENV{'form.navtime'};
      }
      my $textline = "<b>$lt{'mnpa'} $numitems $lt{'robb'}</b>";
      if ($numitems > 0) {
          &Apache::lonnet::put('nohist_'.$ENV{'request.course.id'}.'_discuss',\%discinfo,$ENV{'user.domain'},$ENV{'user.name'});
      } else {
          $textline = "<b>$lt{'twnp'}</b>";
      }
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      $r->print (<<ENDREDIR);
<html>
<head>
<title>New posts marked as read</title>
<meta http-equiv="pragma" content="no-cache" />
<meta HTTP-EQUIV="Refresh" CONTENT="2; url=$feedurl" />
</head>
<body bgcolor="#FFFFFF" onLoad='if (window.name!="loncapaclient") { this.document.reldt.submit(); self.close(); }'>
<img align="right" src="/adm/lonIcons/lonlogos.gif" />
$textline
<form name="reldt" action="$feedurl" target="loncapaclient">
</form>
<br /><a href="$feedurl">Continue</a>
</body>
</html>
ENDREDIR
      return OK;
  } elsif ($ENV{'form.modifydisp'}) {
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      my $symb=$ENV{'form.modifydisp'};
      my ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);
      my $previous=$ENV{'form.previous'};
      my ($dispchg,$markchg) = split/_/,$ENV{'form.changes'};
      my $feedurl = &Apache::lonnet::clutter($url);
 # backward compatibility (bulletin boards used to be 'wrapped')  
      if ($feedurl=~m|^/adm/wrapper/adm/.*/bulletinboard$|) {
          $feedurl=~s|^/adm/wrapper||;
      }
      &print_display_options($r,$symb,$previous,$dispchg,$markchg,$feedurl);
      return OK;
  } elsif (($ENV{'form.markondisp'}) || ($ENV{'form.markonread'}) || ($ENV{'form.allposts'}) || ($ENV{'form.onlyunread'}) ) {
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      my $previous=$ENV{'form.previous'};
      my ($map,$ind,$url);
      if (($ENV{'form.markondisp'}) || ($ENV{'form.markonread'})) {
# ---------------------- Modify setting for identification of 'NEW' posts in this discussion
          my $symb=$ENV{'form.markondisp'}?$ENV{'form.markondisp'}:$ENV{'form.markonread'};
          my $ressymb = $symb;
          ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);
          unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
              $ressymb=~s|(bulletin___\d+___)|$1adm/wrapper|;
          }
          my %discinfo = ();
          my $lastkey = $ressymb.'_lastread';
          my $ondispkey = $ressymb.'_markondisp';
          if ($ENV{'form.markondisp'}) {
              $discinfo{$lastkey} = time;
              $discinfo{$ondispkey} = 1;
          } elsif ($ENV{'form.markonread'}) {
              if ( $previous > 0 ) {
                  $discinfo{$lastkey} = $previous;
              }
              $discinfo{$ondispkey} = 0;
          }
          &Apache::lonnet::put('nohist_'.$ENV{'request.course.id'}.'_discuss',\%discinfo,$ENV{'user.domain'},$ENV{'user.name'});
      }
      if (($ENV{'form.allposts'}) || ($ENV{'form.onlyunread'})) {
# ----------------------------------------------------------------- Modify display setting for this discussion 
          my $symb=$ENV{'form.allposts'}?$ENV{'form.allposts'}:$ENV{'form.onlyunread'};
          my $ressymb = $symb;
          ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);
          unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
              $ressymb=~s|(bulletin___\d+___)|$1adm/wrapper|;
          }
          my %discinfo = ();
          if ($ENV{'form.allposts'}) {
              $discinfo{$ressymb.'_showonlyunread'} = 0;
          } elsif ($ENV{'form.onlyunread'}) {
              $discinfo{$ressymb.'_showonlyunread'} = 1;
          }
          &Apache::lonnet::put('nohist_'.$ENV{'request.course.id'}.'_discuss',\%discinfo,$ENV{'user.domain'},$ENV{'user.name'});
      }
      if (($ENV{'form.markonread'}) || ($ENV{'form.allposts'}) || ($ENV{'form.onlyunread'}) ) {
          &redirect_back($r,&Apache::lonnet::clutter($url),&mt('Changed display status').'<br />','0','0','',$previous);
      } else {
          &redirect_back($r,&Apache::lonnet::clutter($url),&mt('Changed display status').'<br />','0','0');
      }
      return OK;
  } elsif ($ENV{'form.markread'}) {
# ----------------------------------------------------------------- Mark new posts as read
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      my $symb=$ENV{'form.markread'};
      my $ressymb = $symb;
      my ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);
      unless ($ressymb =~ m|bulletin___\d+___adm/wrapper|) {
          $ressymb=~s|(bulletin___\d+___)|$1adm/wrapper|;
      }
      my %discinfo = ();
      my $lastkey = $ressymb.'_lastread';
      $discinfo{$lastkey} = time;
      &Apache::lonnet::put('nohist_'.$ENV{'request.course.id'}.'_discuss',\%discinfo,$ENV{'user.domain'},$ENV{'user.name'});
      &redirect_back($r,&Apache::lonnet::clutter($url),&mt('Changed reading status').'<br />','0','0');
      return OK;
  } elsif (($ENV{'form.hide'}) || ($ENV{'form.unhide'})) {
# ----------------------------------------------------------------- Hide/unhide
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;

    my $entry=$ENV{'form.hide'}?$ENV{'form.hide'}:$ENV{'form.unhide'};

    my ($symb,$idx)=split(/\:\:\:/,$entry);
    my ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);

    my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

        
    my $currenthidden=$contrib{'hidden'};
    
    if ($ENV{'form.hide'}) {
	$currenthidden.='.'.$idx.'.';
    } else {
        $currenthidden=~s/\.$idx\.//g;
    }
    my %newhash=('hidden' => $currenthidden);

    &Apache::lonnet::store(\%newhash,$symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

    &redirect_back($r,&Apache::lonnet::clutter($url),
       &mt('Changed discussion status').'<br />','0','0','',$ENV{'form.previous'});
  } elsif (($ENV{'form.threadedon'}) || ($ENV{'form.threadedoff'})) {
      &Apache::loncommon::content_type($r,'text/html');
      $r->send_http_header;
      if ($ENV{'form.threadedon'}) {
	  &Apache::lonnet::put('environment',{'threadeddiscussion' => 'on'});
	  &Apache::lonnet::appenv('environment.threadeddiscussion' => 'on');
      } else {
 	  &Apache::lonnet::del('environment',['threadeddiscussion']);
	  &Apache::lonnet::delenv('environment\.threadeddiscussion');
      }
      my $symb=$ENV{'form.threadedon'}?$ENV{'form.threadedon'}:$ENV{'form.threadedoff'};
      my ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);
      &redirect_back($r,&Apache::lonnet::clutter($url),
		     &mt('Changed discussion view mode').'<br />','0','0','',$ENV{'form.previous'});
  } elsif ($ENV{'form.deldisc'}) {
# --------------------------------------------------------------- Hide for good
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;

    my $entry=$ENV{'form.deldisc'};

    my ($symb,$idx)=split(/\:\:\:/,$entry);
    my ($map,$ind,$url)=&Apache::lonnet::decode_symb($symb);

    my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

        
    my $currentdeleted=$contrib{'deleted'};
    
    $currentdeleted.='.'.$idx.'.';

    my %newhash=('deleted' => $currentdeleted);

    &Apache::lonnet::store(\%newhash,$symb,$ENV{'request.course.id'},
                     $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		     $ENV{'course.'.$ENV{'request.course.id'}.'.num'});

    &redirect_back($r,&Apache::lonnet::clutter($url),
       &mt('Changed discussion status').'<br />','0','0','',$ENV{'form.previous'});
  } elsif ($ENV{'form.preview'}) {
# -------------------------------------------------------- User wants a preview
      $r->content_type('text/html');
      $r->send_http_header;
      &show_preview($r);
  } else {
# ------------------------------------------------------------- Normal feedback
  my $feedurl=$ENV{'form.postdata'};
  $feedurl=~s/^http\:\/\///;
  $feedurl=~s/^$ENV{'SERVER_NAME'}//;
  $feedurl=~s/^$ENV{'HTTP_HOST'}//;
  $feedurl=~s/\?.+$//;

  my $symb;
  if ($ENV{'form.replydisc'}) {
      $symb=(split(/\:\:\:/,$ENV{'form.replydisc'}))[0];
      my ($map,$id,$url)=&Apache::lonnet::decode_symb($symb);
      $feedurl=&Apache::lonnet::clutter($url);
  } else {
      $symb=&Apache::lonnet::symbread($feedurl);
  }
  unless ($symb) {
      $symb=$ENV{'form.symb'};
      if ($symb) {
	  my ($map,$id,$url)=&Apache::lonnet::decode_symb($symb);
          $feedurl=&Apache::lonnet::clutter($url);
      }
  }
  my $goahead=1;
  if ($feedurl=~/\.(problem|exam|quiz|assess|survey|form)$/) {
      unless ($symb) { $goahead=0; }
  }
  # backward compatibility (bulletin boards used to be 'wrapped')
  if ($feedurl=~m|^/adm/wrapper/adm/.*/bulletinboard$|) {
      $feedurl=~s|^/adm/wrapper||;
  }
  if ($goahead) {
# Go ahead with feedback, no ambiguous reference
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
  
    if (
      (
       ($feedurl=~m:^/res:) && ($feedurl!~m:^/res/adm:)
      ) 
      || 
      ($ENV{'request.course.id'} && ($feedurl!~m:^/adm:))
      ||
      ($ENV{'request.course.id'} && ($symb=~/^bulletin\_\_\_/))
     ) {
# --------------------------------------------------- Print login screen header
    unless ($ENV{'form.sendit'}) {
      my $options=&screen_header($feedurl);
      if ($options) {
	&mail_screen($r,$feedurl,$options);
      } else {
	&fail_redirect($r,$feedurl);
      }
    } else {
      
# Get previous user input
      my $prevattempts=&Apache::loncommon::get_previous_attempt(
            $symb,$ENV{'user.name'},$ENV{'user.domain'},
            $ENV{'request.course.id'});

# Get output from resource
      my $usersaw=&resource_output($feedurl);

# Get resource answer (need to allow student to view grades for this to work)
      &Apache::lonnet::appenv(('allowed.vgr'=>'F'));
      my $useranswer=&Apache::loncommon::get_student_answers(
                       $symb,$ENV{'user.name'},$ENV{'user.domain'},
		       $ENV{'request.course.id'});
      &Apache::lonnet::delenv('allowed.vgr');
# Get attachments, if any, and not too large
      my $attachmenturl='';
      if ($ENV{'form.attachment.filename'}) {
	  unless (length($ENV{'form.attachment'})>131072) {
	      $attachmenturl=&Apache::lonnet::userfileupload('attachment',undef,'feedback');
	  }
      }
# Filter HTML out of message (could be nasty)
      my $message=&clear_out_html($ENV{'form.comment'});

# Assemble email
      my ($email,$citations)=&assemble_email($feedurl,$message,$prevattempts,
          $usersaw,$useranswer);
 
# Who gets this?
      my ($typestyle,%to) = &decide_receiver($feedurl);

# Actually send mail
      my ($status,$numsent)=&send_msg($feedurl,$email,$citations,
          $attachmenturl,%to);

# Discussion? Store that.

      my $numpost=0;
      if ($ENV{'form.discuss'}) {
          my $subject = &clear_out_html($ENV{'form.subject'});
	  $typestyle.=&adddiscuss($symb,$message,0,$attachmenturl,$subject);
	  $numpost++;
      }

      if ($ENV{'form.anondiscuss'}) {
          my $subject = &clear_out_html($ENV{'form.subject'});
	  $typestyle.=&adddiscuss($symb,$message,1,$attachmenturl,$subject);
	  $numpost++;
      }


# Receipt screen and redirect back to where came from
      &redirect_back($r,$feedurl,$typestyle,$numsent,$numpost,$status,$ENV{'form.previous'});

    }
   } else {
# Unable to give feedback
    &no_redirect_back($r,$feedurl);
   }
  } else {
# Ambiguous Problem Resource
      if ( &Apache::lonnet::mod_perl_version() == 2 ) {
	  &Apache::lonnet::cleanenv();
      }
      $r->internal_redirect('/adm/ambiguous');
  }
}
  return OK;
} 

1;
__END__