# The LearningOnline Network with CAPA
# Navigate Maps Handler
#
# $Id: lonnavmaps.pm,v 1.45 2002/09/02 18:25:55 bowersj2 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/
#
# (Page Handler
#
# (TeX Content Handler
#
# 05/29/00,05/30 Gerd Kortemeyer)
# 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
# 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer)
#
# 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer
# YEAR=2002
# 1/1 Gerd Kortemeyer
#

package Apache::lonnavmaps;

use strict;
use Apache::Constants qw(:common :http);
use Apache::lonnet();
use Apache::loncommon();
use HTML::TokeParser;
use GDBM_File;

# -------------------------------------------------------------- Module Globals
my %hash;
my @rows;

#
# These cache hashes need to be independent of user, resource and course
# (user and course can/should be in the keys)
#

my %courserdatas;
my %userrdatas;

#
# These global hashes are dependent on user, course and resource, 
# and need to be initialized every time when a sheet is calculated
#
my %courseopt;
my %useropt;
my %parmhash;

# ------------------------------------------------------------------ Euclid gcd

sub euclid {
    my ($e,$f)=@_;
    my $a; my $b; my $r;
    if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; }
    while ($r!=0) {
	$a=$b; $b=$r;
        $r=$a%$b;
    }
    return $b;
}

# --------------------------------------------------------------------- Parmval

# -------------------------------------------- Figure out a cascading parameter
#
# For this function to work
#
# * parmhash needs to be tied
# * courseopt and useropt need to be initialized for this user and course
#

sub parmval {
    my ($what,$symb)=@_;
    my $cid=$ENV{'request.course.id'};
    my $csec=$ENV{'request.course.sec'};
    my $uname=$ENV{'user.name'};
    my $udom=$ENV{'user.domain'};

    unless ($symb) { return ''; }
    my $result='';

    my ($mapname,$id,$fn)=split(/\_\_\_/,$symb);

# ----------------------------------------------------- Cascading lookup scheme
    my $rwhat=$what;
    $what=~s/^parameter\_//;
    $what=~s/\_/\./;

    my $symbparm=$symb.'.'.$what;
    my $mapparm=$mapname.'___(all).'.$what;
    my $usercourseprefix=$uname.'_'.$udom.'_'.$cid;

    my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what;
    my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm;
    my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm;

    my $courselevel= $usercourseprefix.'.'.$what;
    my $courselevelr=$usercourseprefix.'.'.$symbparm;
    my $courselevelm=$usercourseprefix.'.'.$mapparm;

# ---------------------------------------------------------- first, check user
    if ($uname) {
	if ($useropt{$courselevelr}) { return $useropt{$courselevelr}; }
	if ($useropt{$courselevelm}) { return $useropt{$courselevelm}; }
	if ($useropt{$courselevel}) { return $useropt{$courselevel}; }
    }

# ------------------------------------------------------- second, check course
    if ($csec) {
	if ($courseopt{$seclevelr}) { return $courseopt{$seclevelr}; }
        if ($courseopt{$seclevelm}) { return $courseopt{$seclevelm}; }
        if ($courseopt{$seclevel}) { return $courseopt{$seclevel}; }
    }

    if ($courseopt{$courselevelr}) { return $courseopt{$courselevelr}; }
    if ($courseopt{$courselevelm}) { return $courseopt{$courselevelm}; }
    if ($courseopt{$courselevel}) { return $courseopt{$courselevel}; }

# ----------------------------------------------------- third, check map parms

    my $thisparm=$parmhash{$symbparm};
    if ($thisparm) { return $thisparm; }

# ----------------------------------------------------- fourth , check default

    my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default');
    if ($default) { return $default}

# --------------------------------------------------- fifth , cascade up parts

    my ($space,@qualifier)=split(/\./,$rwhat);
    my $qualifier=join('.',@qualifier);
    unless ($space eq '0') {
	my ($part,$id)=split(/\_/,$space);
	if ($id) {
	    my $partgeneral=&parmval($part.".$qualifier",$symb);
	    if ($partgeneral) { return $partgeneral; }
	} else {
	    my $resourcegeneral=&parmval("0.$qualifier",$symb);
	    if ($resourcegeneral) { return $resourcegeneral; }
	}
    }
    return '';
}



# ------------------------------------------------------------- Find out status
# return codes
# tcode (timecode)
# 1: will open later
# 2: is open and not past due yet
# 3: is past due date
# 4: due in the next 24 hours
#
# code (curent solved status)
# 1: not attempted
# 2: attempted but wrong, or incorrect by instructor
# 3: solved or correct by instructor
# 4: partially correct (one or more parts correct)
# "excused" needs to be supported, but is not yet.
sub astatus {
    my $rid=shift;
    my $code=0;
    my $ctext='';
    $rid=~/(\d+)\.(\d+)/;
    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
	&Apache::lonnet::declutter($hash{'src_'.$rid});
    my %duedate=();
    my %opendate=();
    my %answerdate=();
    # need to always check part 0's open/due/answer status
    foreach (sort(split(/\,/,&Apache::lonnet::metadata($hash{'src_'.$rid},'keys')))) {
        if ($_=~/^parameter\_(.*)\_opendate$/) {
	    my $part=$1;
            $duedate{$part}=&parmval($part.'.duedate',$symb);
            $opendate{$part}=&parmval($part.'.opendate',$symb);
            $answerdate{$part}=&parmval($part.'.answerdate',$symb);
        }
    }
    my $now=time;
    my $tcode=0;

    my %returnhash=&Apache::lonnet::restore($symb);

    foreach (sort(keys(%opendate))) {
	my $duedate=$duedate{$_};
	my $opendate=$opendate{$_};
	my $answerdate=$answerdate{$_};
	my $preface='';
	unless ($_ eq '0') { $preface=' Part: '.$_.' '; }
	if ($opendate) {
	    if ($now<$duedate || (!$duedate)) {
		unless ($tcode==4) { $tcode=2; }
		if ($duedate) {
		    $ctext.=$preface.'Due: '.localtime($duedate);
		} else {
		    $ctext.=$preface.'No Due Date';
		}
		if ($now<$opendate) {
		    unless ($tcode) { $tcode=1; }
		    $ctext.=$preface.'Open: '.localtime($opendate);
		}
		if ($duedate && $duedate-$now<86400) {
		    $tcode=4;
		    $ctext.=$preface.'Due: '.localtime($duedate);
		}
	    } else {
		unless (($tcode==4) || ($tcode eq 2)) { $tcode=3; }
		if ($now<$answerdate) {
		    $ctext.='Answer: '.localtime($duedate);
		}
	    }
	} else {
	    unless (($tcode==2) || ($tcode==4)) { $tcode=1; }
	}
	
	my $status=$returnhash{'resource.'.$_.'.solved'};
	
	if ($status eq 'correct_by_student') {
	    if ($code==0||$code==3) { $code=3; } else { $code=4; }
	    $ctext.=' solved';
	} elsif ($status eq 'correct_by_override') {
	    if ($code==0||$code==3) { $code=3; } else { $code=4; }
	    $ctext.=' override';
	} elsif ($status eq 'incorrect_attempted') {
	    if ($code!=4 && $code!=3) { $code=2; }
	    if ($code==3) { $code=4; }
	    $ctext.=' ('.
		($returnhash{'resource.'.$_.'.tries'}?
		 $returnhash{'resource.'.$_.'.tries'}:'0');
	    my $numtries = &parmval($_.'.maxtries',$symb);
	    if ($numtries) { $ctext.='/'.$numtries.' tries'; }
	    $ctext.=')';
	} elsif ($status eq 'incorrect_by_override') {
	    if ($code!=4 && $code!=3) { $code=2; }
	    if ($code==3) { $code=4; }
	    $ctext.=' override';
	} elsif ($status eq 'excused') {
	    if ($code==0||$code==3) { $code=3; } else { $code=4; }
	    $ctext.=' excused';
	} else {
	    if ($code==0) { $code=1; }
	}
    }

    return 'p'.$code.$tcode.'"'.$ctext.'"';
}


sub addresource {
    my ($resource,$sofar,$rid,$showtypes,$indent,$linkid)=@_;
    if ($showtypes eq 'problems') {
	if ($resource!~/\.(problem|exam|quiz|assess|survey|form)$/) {
	    return;
	}
    }
    my $brepriv=&Apache::lonnet::allowed('bre',$resource);
    if ($hash{'src_'.$rid}) {
	if (($brepriv eq '2') || ($brepriv eq 'F')) {
	    my $pprefix='';
	    if ($resource=~/\.(problem|exam|quiz|assess|survey|form)$/) {
		$pprefix=&astatus($rid);
	    }
	    $$sofar++;
	    if ($indent) { $pprefix='i'.$indent.','.$pprefix; }
	    if ($linkid) { $pprefix='l'.$linkid.','.$pprefix; }
	    if (defined($rows[$$sofar])) {
		$rows[$$sofar].='&'.$pprefix.$rid;
	    } else {
		$rows[$$sofar]=$pprefix.$rid;
	    }
	}
    }
}

sub followlinks () {
    my ($rid,$sofar,$beenhere,$further,$showtypes,$indent,$linkid)=@_;
    my $mincond=1;
    my $next='';
    foreach (split(/\,/,$hash{'to_'.$rid})) {
	my $thiscond=
	    &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
	if ($thiscond>=$mincond) {
	    if ($next) {
		$next.=','.$_.':'.$thiscond;
	    } else {
		$next=$_.':'.$thiscond;
	    }
	    if ($thiscond>$mincond) { $mincond=$thiscond; }
	}
    }
    my $col=0;
    &Apache::lonxml::debug("following links -$next-");
    foreach (split(/\,/,$next)) {
	my ($nextlinkid,$condval)=split(/\:/,$_);
	if ($condval>=$mincond) {
	    my $now=&tracetable($sofar,$hash{'goesto_'.$nextlinkid},
				$beenhere,$showtypes,$indent,$linkid);
	    if ($now>$further) {		
		if ($col>0) {
		    my $string;
		    for(my $i=0;$i<$col;$i++) { $string.='&'; }
		    for(my $i=$further+1;$now-1>$i;$i++) {
			$rows[$i]=$string.$rows[$i];
		    }
		}
		$further=$now;
	    }
	}
	$col++;
    }
    return $further;
}
# ------------------------------------------------------------ Build page table

sub tracetable {
    my ($sofar,$rid,$beenhere,$showtypes,$indent,$linkid)=@_;
    my $newshowtypes=$showtypes;
    my $further=$sofar;
# $Apache::lonxml::debug=1;
    &Apache::lonxml::debug("$rid ; $linkid ; $sofar ; $beenhere ; ".$hash{'src_'.$rid});
    if ($beenhere=~/\&$rid\&/) { return $further; }
    $beenhere.=$rid.'&';

    if (defined($hash{'is_map_'.$rid})) {
	$sofar++;
	my $tprefix='';
	if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
	    eq 'sequence') {
	    $tprefix='h';
	} elsif ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}}
		 eq 'page') {
	    $tprefix='j';
	    if ($indent) { $tprefix='i'.$indent.','.$tprefix; }
	    if ($linkid) { $tprefix='l'.$linkid.','.$tprefix; }
	    $newshowtypes='problems';
	    $indent++;
	    #if in a .page continue to link the encompising .page
	    if (!$linkid) { $linkid=$rid; }
	}
	if (defined($rows[$sofar])) {
	    $rows[$sofar].='&'.$tprefix.$rid;
	} else {
	    $rows[$sofar]=$tprefix.$rid;
	}
	if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
	    (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
	    my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
	    $sofar=&tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
			       '&'.$frid.'&',$newshowtypes,$indent,$linkid);
	    &addresource($hash{'src_'.$frid},\$sofar,$frid,$newshowtypes,
			 $indent,$linkid);
	    if ($tprefix =~ /j$/) { $indent--; $linkid=''; }
	}
    } else {
	&addresource($hash{'src_'.$rid},\$sofar,$rid,$showtypes,
		     $indent,$linkid);
    }

    if (defined($hash{'to_'.$rid})) {
	$further=&followlinks($rid,$sofar,$beenhere,$further,$showtypes,
			      $indent,$linkid);
    }

    return $further;
}

# ================================================================ Main Handler

sub handler {
    my $r=shift;


# ------------------------------------------- Set document type for header only

    if ($r->header_only) {
	if ($ENV{'browser.mathml'}) {
	    $r->content_type('text/xml');
	} else {
	    $r->content_type('text/html');
	}
	$r->send_http_header;
	return OK;
    }
    my $requrl=$r->uri;
    my $hashtied;
# ----------------------------------------------------------------- Tie db file
    my $fn;
    if ($ENV{'request.course.fn'}) {
	$fn=$ENV{'request.course.fn'};
	if (-e "$fn.db") {
	    if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) &&
		(tie(%parmhash,'GDBM_File',
		     $ENV{'request.course.fn'}.'_parms.db',
		     &GDBM_READER(),0640))) {
		$hashtied=1;
	    }
	}
    }
    if (!$hashtied) {
	$ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
	return HTTP_NOT_ACCEPTABLE; 
    }

# ------------------------------------------------------------------- Hash tied

    if ($ENV{'browser.mathml'}) {
	$r->content_type('text/xml');
    } else {
	$r->content_type('text/html');
    }
    &Apache::loncommon::no_cache($r);
    $r->send_http_header;

    my $firstres=$hash{'map_start_'.
           &Apache::lonnet::clutter($ENV{'request.course.uri'})};
    my $lastres=$hash{'map_finish_'.
           &Apache::lonnet::clutter($ENV{'request.course.uri'})};
    if (!(($firstres) && ($lastres))) {
	$r->print('<html><body>Coursemap undefined.</body></html>');
    } else {

# ----------------------------------------------------------------- Render page
# -------------------------------------------------------------- Set parameters


# ---------------------------- initialize coursedata and userdata for this user
	undef %courseopt;
	undef %useropt;

	my $uname=$ENV{'user.name'};
	my $udom=$ENV{'user.domain'};
	my $uhome=$ENV{'user.home'};
	my $cid=$ENV{'request.course.id'};
	my $chome=$ENV{'course.'.$cid.'.home'};
	my ($cdom,$cnum)=split(/\_/,$cid);

	my $userprefix=$uname.'_'.$udom.'_';

	unless ($uhome eq 'no_host') { 
# -------------------------------------------------------------- Get coursedata
	    unless ((time-$courserdatas{$cid.'.last_cache'})<240) {
		my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum.
						 ':resourcedata',$chome);
		if ($reply!~/^error\:/) {
		    $courserdatas{$cid}=$reply;
		    $courserdatas{$cid.'.last_cache'}=time;
		}
	    }
	    foreach (split(/\&/,$courserdatas{$cid})) {
		my ($name,$value)=split(/\=/,$_);
		$courseopt{$userprefix.&Apache::lonnet::unescape($name)}=
		    &Apache::lonnet::unescape($value);
	    }
# --------------------------------------------------- Get userdata (if present)
	    unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) {
		my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
		if ($reply!~/^error\:/) {
		    $userrdatas{$uname.'___'.$udom}=$reply;
		    $userrdatas{$uname.'___'.$udom.'.last_cache'}=time;
		}
	    }
	    foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) {
		my ($name,$value)=split(/\=/,$_);
		$useropt{$userprefix.&Apache::lonnet::unescape($name)}=
		    &Apache::lonnet::unescape($value);
	    }
	}

	@rows=();

	&tracetable(0,$firstres,'&','',0);

# ------------------------------------------------------------------ Page parms

	my $j;
	my $i;
	my $lcm=1;
	my $contents=0;

# ---------------------------------------------- Go through table to get layout

	for ($i=0;$i<=$#rows;$i++) {
	    if ($rows[$i]) {
		&Apache::lonxml::debug("Row $i is:".$rows[$i]);
		$contents++;
		my @colcont=split(/\&/,$rows[$i]);
		$lcm*=($#colcont+1)/euclid($lcm,($#colcont+1));
	    } 
	}


	unless ($contents) {
	    $r->print('<html><body>Empty Map.</body></html>');
	} else {

# ------------------------------------------------------------------ Build page

	    my $currenturl=$ENV{'form.postdata'};
	    $currenturl=~s/^http\:\/\///;
	    $currenturl=~s/^[^\/]+//;

# ---------------------------------------------------------------- Send headers

	    my $date=localtime;
	    my $now=time;
# ----------------------------------------- Get email status and discussiontime

	    my %emailstatus=&Apache::lonnet::dump('email_status');
	    my $logouttime=$emailstatus{'logout'};
	    my $courseleave=$emailstatus{'logout_'.$ENV{'request.course.id'}};
	    my $lastcheck=($courseleave>$logouttime?$courseleave:$logouttime);

	    my %discussiontimes=&Apache::lonnet::dump('discussiontimes',
							  $cdom,$cnum);

	    my %feedback=();
	    my %error=();
	    foreach my $msgid (split(/\&/,&Apache::lonnet::reply('keys:'.
								 $ENV{'user.domain'}.':'.
								 $ENV{'user.name'}.':nohist_email',
								 $ENV{'user.home'}))) {
		$msgid=&Apache::lonnet::unescape($msgid);
		my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid));
		if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) {
		    my ($what,$url)=($1,$2);
		    my %status=
			&Apache::lonnet::get('email_status',[$msgid]);
		    if ($status{$msgid}=~/^error\:/) { 
			$status{$msgid}=''; 
		    }
			
		    if (($status{$msgid} eq 'new') || 
			(!$status{$msgid})) { 
			if ($what eq 'Error') {
			    $error{$url}.=','.$msgid; 
			} else {
			    $feedback{$url}.=','.$msgid;
			}
		    }
		}
	    }
# ----------------------------------------------------------- Start Page Output
            my $bodytagadd='';
	    $r->print(
                   '<html><head><title>Navigate Course Map</title></head>');
	    if (($currenturl=~/^\/res/) &&
		($currenturl!~/^\/res\/adm/)) {
		$bodytagadd='onLoad="window.location.hash='."'curloc'".'"';
	    }
	    $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
                                                  $bodytagadd));
	    $r->print('<script>window.focus();</script>');
	    my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
	    if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }
	    $r->print("<h3>$date</h3>\n");
	    $r->rflush();
	    $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.
		      localtime($lastcheck).
		      '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'); 
	    if (($currenturl=~/^\/res/) &&
		($currenturl!~/^\/res\/adm/)) {
		$r->print('<a href="#curloc">Current Location</a><p>');
	    }
# ----------------------------------------------------- The little content list
	    for ($i=0;$i<=$#rows;$i++) {
		if ($rows[$i]) {
		    my @colcont=split(/\&/,$rows[$i]);
		    my $avespan=$lcm/($#colcont+1);
		    for ($j=0;$j<=$#colcont;$j++) {
			my $rid=$colcont[$j];
			if ($rid=~/^h(.+)/) {
			    $rid=$1;
			    $r->print('&nbsp;&nbsp;&nbsp;<a href="#'.
				      $rid.'">'.$hash{'title_'.$rid}.
				      '</a><br>');
			}
		    }
		}
	    }
# ----------------------------------------------------------------- Start table
	    $r->print('<hr><table cols="'.$lcm.'" border="0">');
	    for ($i=0;$i<=$#rows;$i++) {
		if ($rows[$i]) {
		    $r->print("\n<tr>");
		    my @colcont=split(/\&/,$rows[$i]);
		    my $avespan=$lcm/($#colcont+1);

		    # for each item I wish to print on this row...
		    for ($j=0;$j<=$#colcont;$j++) {
			my $indent;my $indentstr;
			my $linkid;
			my $rid=$colcont[$j];

			# bug? $rid can't accept a list of two elements
                        $rid=~/(\d+)\.(\d+)$/;
			my $src=
			   &Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2});
			my $symb=
	  &Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.$src;
			my $add='<td>';
			my $adde='</td>';
			my $hwk='<font color="#223322">';
			my $hwke='</font>';
			if ($rid=~/^l(\d+\.\d+),(.+)/) { $linkid=$1; $rid=$2; }
			if ($rid=~/^i(\d+),(.+)/) { $indent=$1; $rid=$2; }
			if ($rid=~/^h(.+)/) {
			    $rid=$1;
			    $add='<th bgcolor="#AAFF55"><a name="'.$rid.'">';
			    $adde='</th>';
                            if (($ENV{'user.adv'}) && 
				($parmhash{$symb.'.0.parameter_randompick'})) {
                               $adde=' (randomly select '.
				   $parmhash{$symb.'.0.parameter_randompick'}.
                                   ')</th>';
                            }
			}
			if ($rid=~/^j(.+)/) { $rid=$1; }
			if ($rid=~/^p(\d)(\d)\"([\w\: \(\)\/\,]*)\"(.+)/) {
			    # sub astatus describes what code/tcode mean
			    my $code=$1;
			    my $tcode=$2;
			    my $ctext=$3;
			    $rid=$4;
			    if ($tcode eq '1') {
				$add='<td bgcolor="#AAAAAA">';
			    }
			    if ($code eq '3') {
				$add='<td bgcolor="#AAFFAA">';
			    } elsif ($code eq '4') {
				$add='<td bgcolor="#E0FFAA">';
			    } else {
				$add='<td bgcolor="#CCCCFF">';
				if ($tcode eq '2') {
				    $add='<td bgcolor="#FFFFAA">';
				}
				if ($tcode eq '4') {
				    $add='<td bgcolor="#FFFF33">';
				    $adde='</td>';
				}
			    }
			    $hwk='<font color="#888811"><b>';
			    $hwke='</b></font>';
			    if ($code eq '1') {
				$hwke='</b> ('.$ctext.')</font>';
			    }
			    if ($code eq '2' || $code eq '4') {
				$hwk='<font color="#992222"><b>';
				$hwke='</b> ('.$ctext.')</font>';
			    }
			    if ($code eq '3') {
				$hwk='<font color="#229922"><b>';
				$hwke='</b> ('.$ctext.')</font>';
			    }
			}
			if ($rid && $hash{'src_'.$rid} eq $currenturl) {
			    $add=$add.'<a name="curloc"></a>'.
				'<font color=red size=+2><b>&gt; </b></font>';
			    $adde=
				'<font color=red size=+2><b> &lt;</b></font>'.$adde;
			}
			if ($discussiontimes{$symb}>$lastcheck) {
			    $adde=
				'<img border=0 src="/adm/lonMisc/chat.gif">'.
				    $adde;
			}
			if ($error{$src}) {
			    foreach (split(/\,/,$error{$src})) {
				if ($_) {
				    $adde=
					'&nbsp;<a href="/adm/email?display='.
					    &Apache::lonnet::escape($_).
						'"><img src="/adm/lonMisc/bomb.gif" border=0></a>'
						    .$adde;
				}
			    }
			}
			if ($feedback{$src}) {
			    foreach (split(/\,/,$feedback{$src})) {
				if ($_) {
				    $adde=
					'&nbsp;<a href="/adm/email?display='.
					    &Apache::lonnet::escape($_).
						'"><img src="/adm/lonMisc/feedback.gif" border=0></a>'
						    .$adde;
				}
			    }
			}
			if ($indent) {
			    my $is="&nbsp;&nbsp;";
			    for(my $i=-1;$i<$indent;$i++) { $indentstr.=$is; }
			}
			if (!$linkid) { $linkid=$rid; }
                        if ($hash{'randomout_'.$rid}) {
                            $adde=' <i>(hidden)</i>'.$adde;
                        }
			$r->print($add.$indentstr);
			if ($rid) {
			    $r->print('<a href="'.$hash{'src_'.$linkid}.
                                      (($hash{'src_'.$linkid}=~/\?/)?'&':'?').
                                      'symb='.&Apache::lonnet::escape($symb)
                                       .'">'.
				      $hwk.$hash{'title_'.$rid}.$hwke.'</a>');
			}
			$r->print($adde);
		    }
		    $r->print('</tr>');
		}
	    }
	    $r->print("\n</table>");
	    $r->print('</body></html>');
# -------------------------------------------------------------------- End page
	}                  
# ------------------------------------------------------------- End render page
    }
# ------------------------------------------------------------------ Untie hash
    unless (untie(%hash)) {
	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
				 "Could not untie coursemap $fn (browse).</font>"); 
    }
    unless (untie(%parmhash)) {
	&Apache::lonnet::logthis("<font color=blue>WARNING: ".
				 "Could not untie parmhash (browse).</font>"); 
    }
    return OK;
}

1;
__END__