# The LearningOnline Network with CAPA
#
# Routines for messaging
#
# (Routines to control the menu
#
# (TeX Conversion Module
#
# 05/29/00,05/30 Gerd Kortemeyer)
#
# 10/05 Gerd Kortemeyer)
#
# 10/19,10/20,10/30,
# 02/06/01 Gerd Kortemeyer
# 07/27 Guy Albertelli
# 07/27,07/28,07/30,08/03,08/06,08/08,08/09 Gerd Kortemeyer

package Apache::lonmsg;

use strict;
use Apache::lonnet();
use vars qw($msgcount);
use HTML::TokeParser;
use Apache::Constants qw(:common);

# ===================================================================== Package

sub packagemsg {
    my ($subject,$message,$citation)=@_;
    $message=~s/\</\&lt\;/g;
    $message=~s/\>/\&gt\;/g;
    $citation=~s/\</\&lt\;/g;
    $citation=~s/\>/\&gt\;/g;
    $subject=~s/\</\&lt\;/g;
    $subject=~s/\>/\&gt\;/g;
    my $now=time;
    $msgcount++;
    my $partsubj=$subject;
    $partsubj=&Apache::lonnet::escape($partsubj);
    $partsubj=substr($partsubj,0,50);
    my $msgid=&Apache::lonnet::escape(
           $now.':'.$partsubj.':'.$ENV{'user.name'}.':'.
           $ENV{'user.domain'}.':'.$msgcount.':'.$$);
    return $msgid,
           '<sendername>'.$ENV{'user.name'}.'</sendername>'.
           '<senderdomain>'.$ENV{'user.domain'}.'</senderdomain>'.
           '<subject>'.$subject.'</subject>'.
	   '<time>'.localtime($now).'</time>'.
	   '<servername>'.$ENV{'SERVER_NAME'}.'</servername>'.
           '<host>'.$ENV{'HTTP_HOST'}.'</host>'.
	   '<client>'.$ENV{'REMOTE_ADDR'}.'</client>'.
	   '<browsertype>'.$ENV{'browser.type'}.'</browsertype>'.
	   '<browseros>'.$ENV{'browser.os'}.'</browseros>'.
	   '<browserversion>'.$ENV{'browser.version'}.'</browserversion>'.
           '<browsermathml>'.$ENV{'browser.mathml'}.'</browsermathml>'.
	   '<browserraw>'.$ENV{'HTTP_USER_AGENT'}.'</browserraw>'.
	   '<courseid>'.$ENV{'request.course.id'}.'</courseid>'.
	   '<role>'.$ENV{'request.role'}.'</role>'.
	   '<resource>'.$ENV{'request.filename'}.'</resource>'.
           '<msgid>'.$msgid.'</msgid>'.
	   '<message>'.$message.'</message>'.
	   '<citation>'.$citation.'</citation>';
}

# ================================================== Unpack message into a hash

sub unpackagemsg {
    my $message=shift;
    my %content=();
    my $parser=HTML::TokeParser->new(\$message);
    my $token;
    while ($token=$parser->get_token) {
       if ($token->[0] eq 'S') {
	   my $entry=$token->[1];
           my $value=$parser->get_text('/'.$entry);
           $content{$entry}=$value;
       }
    }
    return %content;
}

# ======================================================= Get info out of msgid

sub unpackmsgid {
    my $msgid=&Apache::lonnet::unescape(shift);
    my ($sendtime,$shortsubj,$fromname,$fromdomain)=split(/\:/,
                          &Apache::lonnet::unescape($msgid));
    my %status=&Apache::lonnet::get('email_status',[$msgid]);
    if ($status{$msgid}=~/^error\:/) { $status{$msgid}=''; }
    unless ($status{$msgid}) { $status{$msgid}='new'; }
    return ($sendtime,$shortsubj,$fromname,$fromdomain,$status{$msgid});
} 

# =============================== Automated message to the author of a resource

sub author_res_msg {
    my ($filename,$message)=@_;
    unless ($message) { return 'empty'; }
    $filename=&Apache::lonnet::declutter($filename);
    my ($domain,$author,@dummy)=split(/\//,$filename);
    my $homeserver=&Apache::lonnet::homeserver($author,$domain);
    if ($homeserver ne 'no_host') {
       my $id=unpack("%32C*",$message);
       my $msgid;
       ($msgid,$message)=&packagemsg($filename,$message);
       return &Apache::lonnet::reply('put:'.$domain.':'.$author.
         ':nohist_res_msgs:'.
          &Apache::lonnet::escape($filename.'_'.$id).'='.
          &Apache::lonnet::escape($message),$homeserver);
    }
    return 'no_host';
}

# ================================================== Critical message to a user

sub user_crit_msg {
    my ($user,$domain,$subject,$message)=@_;
# Check if allowed missing
    my $status='';
    my $msgid='undefined';
    unless (($message)&&($user)&&($domain)) { $status='empty'; };
    my $homeserver=&Apache::lonnet::homeserver($user,$domain);
    if ($homeserver ne 'no_host') {
       my $msgid;
       ($msgid,$message)=&packagemsg($subject,$message);
       $status=&Apache::lonnet::critical(
           'put:'.$domain.':'.$user.':critical:'.
           &Apache::lonnet::escape($msgid).'='.
           &Apache::lonnet::escape($message),$homeserver);
    } else {
       $status='no_host';
    }
    &Apache::lonnet::logthis(
      'Sending critical email '.$msgid.
      ', log status: '.
      &Apache::lonnet::log($ENV{'user.domain'},$ENV{'user.name'},
                         $ENV{'user.home'},
      'Sending critical '.$msgid.' to '.$user.' at '.$domain.' with status: '
      .$status));
    return $status;
}

# =================================================== Critical message received

sub user_crit_received {
    my $msgid=shift;
    my %message=&Apache::lonnet::get('critical',[$msgid]);
    my %contents=&unpackagemsg($message{$msgid});
    my $status='rec: '.
     &user_normal_msg($contents{'sendername'},$contents{'senderdomain'},
                     'Receipt: '.$ENV{'user.name'}.' at '.$ENV{'user.domain'},
                     'User '.$ENV{'user.name'}.' at '.$ENV{'user.domain'}.
                     ' acknowledged receipt of message "'.
                     $contents{'subject'}.'" dated '.$contents{'time'}.".\n\n"
                     .'Message ID: '.$contents{'msgid'});
    $status.=' trans: '.
     &Apache::lonnet::put(
     'nohist_email',{$contents{'msgid'} => $message{$msgid}});
    $status.=' del: '.
     &Apache::lonnet::del('critical',[$contents{'msgid'}]);
    &Apache::lonnet::log($ENV{'user.domain'},$ENV{'user.name'},
                         $ENV{'user.home'},'Received critical message '.
                         $contents{'msgid'}.
                         ', '.$status);
    return $status;
}

# ======================================================== Normal communication

sub user_normal_msg {
    my ($user,$domain,$subject,$message,$citation)=@_;
# Check if allowed missing
    my $status='';
    my $msgid='undefined';
    unless (($message)&&($user)&&($domain)) { $status='empty'; };
    my $homeserver=&Apache::lonnet::homeserver($user,$domain);
    if ($homeserver ne 'no_host') {
       my $msgid;
       ($msgid,$message)=&packagemsg($subject,$message,$citation);
       $status=&Apache::lonnet::critical(
           'put:'.$domain.':'.$user.':nohist_email:'.
           &Apache::lonnet::escape($msgid).'='.
           &Apache::lonnet::escape($message),$homeserver);
    } else {
       $status='no_host';
    }
    &Apache::lonnet::log($ENV{'user.domain'},$ENV{'user.name'},
                         $ENV{'user.home'},
      'Sending '.$msgid.' to '.$user.' at '.$domain.' with status: '.$status);
    return $status;
}

# =============================================================== Status Change

sub statuschange {
    my ($msgid,$newstatus)=@_;
    my %status=&Apache::lonnet::get('email_status',[$msgid]);
    if ($status{$msgid}=~/^error\:/) { $status{$msgid}=''; }
    unless ($status{$msgid}) { $status{$msgid}='new'; }
    unless (($status{$msgid} eq 'replied') || 
            ($status{$msgid} eq 'forwarded')) {
	&Apache::lonnet::put('email_status',{$msgid => $newstatus});
    }
    if (($newstatus eq 'deleted') || ($newstatus eq 'new')) {
	&Apache::lonnet::put('email_status',{$msgid => $newstatus});
    }
}

# ======================================================= Display a course list

sub discourse {
    my $r=shift;
    my %courselist=&Apache::lonnet::dump(
                   'classlist',
		   $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
		   $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
    my $now=time;
    $r->print(<<ENDDISHEADER);
<input type=hidden name=sendmode value=group>
<script>
    function checkall() {
	for (i=0; i<document.forms.compemail.elements.length; i++) {
            if 
          (document.forms.compemail.elements[i].name.indexOf('send_to_')==0) {
	      document.forms.compemail.elements[i].checked=true;
            }
        }
    }

    function uncheckall() {
	for (i=0; i<document.forms.compemail.elements.length; i++) {
            if 
          (document.forms.compemail.elements[i].name.indexOf('send_to_')==0) {
	      document.forms.compemail.elements[i].checked=false;
            }
        }
    }
</script>
<input type=button onClick="checkall()" value="Check for All">
<input type=button onClick="uncheckall()" value="Check for None">
<p>
ENDDISHEADER
    map {
        my ($end,$start)=split(/\:/,$courselist{$_});
        my $active=1;
        if (($end) && ($now>$end)) { $active=0; }
        if ($active) {
           my ($sname,$sdom)=split(/\:/,$_);
           my %reply=&Apache::lonnet::get('environment',
              ['firstname','middlename','lastname','generation'],
              $sdom,$sname);
           $r->print('<br><input type=checkbox name="send_to_'.$_.'"> '.
		      $reply{'firstname'}.' '. 
                      $reply{'middlename'}.' '.
                      $reply{'lastname'}.' '.
                      $reply{'generation'}.
                      ' ('.$_.')');
        } 
    } sort keys %courselist;
}

# ==================================================== Display Critical Message

sub discrit {
    my $r=shift;
      $r->print('<h1><font color=red>Critical Messages</font></h1>'.
         '<form action=/adm/email method=post>'.
         '<input type=hidden name=confirm value=true>');
      my %what=&Apache::lonnet::dump('critical');
      map {
          my %content=&unpackagemsg($what{$_});
          $content{'message'}=~s/\n/\<br\>/g;
	  $r->print('<hr>From: <b>'.$content{'sendername'}.'@'.
                    $content{'senderdomain'}.'</b> ('.$content{'time'}.
                    ')<br><blockquote>'.$content{'message'}.'</blockquote>'.
  '<input type=submit name="rec_'.$_.'" value="Confirm Receipt">'.
 '<input type=submit name="reprec_'.$_.'" value="Confirm Receipt and Reply">');
      } sort keys %what;
      $r->print(
          '<input type=hidden name="displayedcrit" value="true"></form>');
}

# =============================================================== Compose reply

sub comprep {
    my ($r,$msgid)=@_;
      my %message=&Apache::lonnet::get('nohist_email',[$msgid]);
      my %content=&unpackagemsg($message{$msgid});
      my $quotemsg='> '.$content{'message'};
      $quotemsg=~s/\r/\n/g;
      $quotemsg=~s/\f/\n/g;
      $quotemsg=~s/\n+/\n\> /g;
      my $subject='Re: '.$content{'subject'};
      my $dispcrit='';
      if (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})) {
         $dispcrit=
	     '<input type=checkbox name=critmsg> Send as critical message<p>';
      }
      $r->print(<<"ENDREPLY");
<form action="/adm/email" method=post>
<input type=hidden name=sendreply value="$msgid">
Subject: <input type=text size=50 name=subject value="$subject"><p>
<textarea name=message cols=60 rows=10>
$quotemsg
</textarea><p>
$dispcrit
<input type=submit value="Send Reply">
</form>
ENDREPLY
}

# ======================================================== Display all messages

sub disall {
    my $r=shift;
    $r->print('<h1>Display All Messages</h1>'.
     '<table border=2><tr><th colspan=2>&nbsp</th><th>Date</th>'.
     '<th>Username</th><th>Domain</th><th>Subject</th><th>Status</th></tr>');
    map {
        my ($sendtime,$shortsubj,$fromname,$fromdomain,$status)=
	    &Apache::lonmsg::unpackmsgid($_);
       unless ($status eq 'deleted') {
        if ($status eq 'new') {
	    $r->print('<tr bgcolor="#FFBB77">');
        } elsif ($status eq 'read') {
	    $r->print('<tr bgcolor="#BBBB77">');
        } elsif ($status eq 'replied') {
	    $r->print('<tr bgcolor="#AAAA88">');
	} else {
	    $r->print('<tr bgcolor="#99BBBB">');
        }
        $r->print('<td><a href="/adm/email?display='.$_.
                  '">Open</a></td><td><a href="/adm/email?markdel='.$_.
                  '">Delete</a></td><td>'.localtime($sendtime).'</td><td>'.
                  $fromname.'</td><td>'.$fromdomain.'</td><td>'.
		      &Apache::lonnet::unescape($shortsubj).'</td><td>'.
                      $status.'</td></tr>');
       }
    } sort split(/\&/,&Apache::lonnet::reply('keys:'.
					$ENV{'user.domain'}.':'.
                                        $ENV{'user.name'}.':nohist_email',
                                        $ENV{'user.home'}));
    $r->print('</table></body></html>');
}

# ============================================================== Compose output

sub compout {
    my ($r,$forwarding,$broadcast)=@_;
      my $dispcrit='';
    my $dissub='';
    my $dismsg='';
    my $func='Send New';
      if (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'})) {
         $dispcrit=
	     '<input type=checkbox name=critmsg> Send as critical message<p>';
      }
    if ($forwarding) {
       $dispcrit.='<input type=hidden name=forwid value="'.
	   $forwarding.'">';
       $func='Forward';
      my %message=&Apache::lonnet::get('nohist_email',[$forwarding]);
      my %content=&unpackagemsg($message{$forwarding});

       $dissub='Forwarding: '.$content{'subject'};
       $dismsg='Forwarded message from '.
	   $content{'sendername'}.' at '.$content{'senderdomain'};
    }
    my $defdom=$ENV{'user.domain'};
      $r->print('<form action="/adm/email"  name="compemail" method=post>'.
                '<input type=hidden name=sendmail value=on><table>');
    unless ($broadcast eq 'group') {
       $r->print(<<"ENDREC");
<table>
<tr><td>Username:</td><td><input type=text size=12 name=recuname></td></tr>
<tr><td>Domain:</td>
<td><input type=text size=12 name=recdomain value="$defdom"></td></tr>
ENDREC
    }
    $r->print(<<"ENDCOMP");
<tr><td>Subject:</td><td><input type=text size=50 name=subject value="$dissub">
</td></tr></table>
<textarea name=message cols=60 rows=10>$dismsg
</textarea><p>
$dispcrit
<input type=submit value="$func Mail">
ENDCOMP
    if ($broadcast eq 'group') {
       &discourse;
    }
    $r->print('</form>');
}

# ===================================================================== Handler

sub handler {
    my $r=shift;

# ----------------------------------------------------------- Set document type

  $r->content_type('text/html');
  $r->send_http_header;

  return OK if $r->header_only;

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

    map {
       my ($name, $value) = split(/=/,$_);
       $value =~ tr/+/ /;
       $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
       if (($name eq 'display') || ($name eq 'replyto') || 
           ($name eq 'forward') || ($name eq 'markread') ||
           ($name eq 'markdel') || ($name eq 'markunread') ||
           ($name eq 'sendreply') || ($name eq 'compose') ||
           ($name eq 'sendmail') || ($name eq 'critical')) {
           unless ($ENV{'form.'.$name}) {
              $ENV{'form.'.$name}=$value;
	   }
       }
    } (split(/&/,$ENV{'QUERY_STRING'}));

# --------------------------------------------------------------- Render Output
  
  $r->print('<html><head><title>EMail and Messaging</title></head>');
  $r->print(
   '<body bgcolor="#FFFFFF"><img align=right src=/adm/lonIcons/lonlogos.gif>');
  $r->print('<h1>EMail</h1>');
  if ($ENV{'form.display'}) {
      my $msgid=$ENV{'form.display'};
      &statuschange($msgid,'read');
      my %message=&Apache::lonnet::get('nohist_email',[$msgid]);
      my %content=&unpackagemsg($message{$msgid});
      $r->print('<b>Subject:</b> '.$content{'subject'}.
             '<br><b>From:</b> '.$content{'sendername'}.' at '.
                                 $content{'senderdomain'}.
             '<br><b>Time:</b> '.$content{'time'}.'<p>'.
             '<table border=2><tr bgcolor="#FFFFAA"><td>Functions:</td>'.
           '<td><a href="/adm/email?replyto='.&Apache::lonnet::escape($msgid).
             '"><b>Reply</b></a></td>'.
           '<td><a href="/adm/email?forward='.&Apache::lonnet::escape($msgid).
             '"><b>Forward</b></a></td>'.
        '<td><a href="/adm/email?markunread='.&Apache::lonnet::escape($msgid).
             '"><b>Mark Unread</b></a></td>'.
        '<td><a href="/adm/email"><b>Display all Messages</b></a></td>'.
             '</tr></table><p><pre>'.
             $content{'message'}.'</pre><hr>'.$content{'citation'});
  } elsif ($ENV{'form.replyto'}) {
      &comprep($r,$ENV{'form.replyto'});
  } elsif ($ENV{'form.sendreply'}) {
      my $msgid=$ENV{'form.sendreply'};
      my %message=&Apache::lonnet::get('nohist_email',[$msgid]);
      my %content=&unpackagemsg($message{$msgid});
      &statuschange($msgid,'replied');
      if (($ENV{'form.critmsg'}) && 
          (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'}))) {
         $r->print('Sending critical: '.
                &user_crit_msg($content{'sendername'},
                                 $content{'senderdomain'},
                                 $ENV{'form.subject'},
                                 $ENV{'form.message'}));
      } else {
         $r->print('Sending: '.&user_normal_msg($content{'sendername'},
                                 $content{'senderdomain'},
                                 $ENV{'form.subject'},
                                 $ENV{'form.message'}));
      }
      if ($ENV{'form.displayedcrit'}) {
          &discrit($r);
      } else {
	  &disall($r);
      }
  } elsif ($ENV{'form.confirm'}) {
      map {
          if ($_=~/^form\.rec\_(.*)$/) {
	      $r->print('<b>Confirming Receipt:</b> '.
                        &user_crit_received($1).'<br>');
          }
          if ($_=~/^form\.reprec\_(.*)$/) {
              my $msgid=$1;
	      $r->print('<b>Confirming Receipt:</b> '.
                        &user_crit_received($msgid).'<br>');
              &comprep($r,$msgid);
          }
      } keys %ENV;
      &discrit($r);
  } elsif ($ENV{'form.critical'}) {
      &discrit($r);
  } elsif ($ENV{'form.forward'}) {
      &compout($r,$ENV{'form.forward'});
  } elsif ($ENV{'form.markread'}) {
  } elsif ($ENV{'form.markdel'}) {
      &statuschange($ENV{'form.markdel'},'deleted');
      &disall($r);
  } elsif ($ENV{'form.markunread'}) {
      &statuschange($ENV{'form.markunread'},'new');
      &disall($r);
  } elsif ($ENV{'form.compose'}) {
      &compout($r,'',$ENV{'form.compose'});
  } elsif ($ENV{'form.sendmail'}) {
      my %content=();
      undef %content;
      if ($ENV{'form.forwid'}) {
        my $msgid=$ENV{'form.forwid'};
        my %message=&Apache::lonnet::get('nohist_email',[$msgid]);
        %content=&unpackagemsg($message{$msgid});
        &statuschange($msgid,'forwarded');
        $ENV{'form.message'}.="\n\n-- Forwarded message --\n\n".
	                       $content{'message'};
      }
      if (($ENV{'form.critmsg'}) && 
          (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'}))) {
         $r->print('Sending critical: '.
                &user_crit_msg($ENV{'form.recuname'},
                                 $ENV{'form.recdomain'},
                                 $ENV{'form.subject'},
                                 $ENV{'form.message'},
                                 $content{'citation'}));
      } else {
         $r->print('Sending: '.&user_normal_msg($ENV{'form.recuname'},
                                 $ENV{'form.recdomain'},
                                 $ENV{'form.subject'},
                                 $ENV{'form.message'},
                                 $content{'citation'}));
      }
      if ($ENV{'form.displayedcrit'}) {
          &discrit($r);
      } else {
	  &disall($r);
      }
  } else {
      &disall($r);
  }
  $r->print('</body></html>');
  return OK;

}
# ================================================= Main program, reset counter

sub BEGIN {
    $msgcount=0;
}

1;
__END__