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# The LearningOnline Network with CAPA
# Page Handler
#
# (TeX Content Handler
#
# 05/29/00,05/30 Gerd Kortemeyer)
# 08/30,08/31 Gerd Kortemeyer

package Apache::lonpage;

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

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

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

sub tracetable {
    my ($sofar,$rid,$beenhere)=@_;
    my $further=$sofar;
    unless ($beenhere=~/\&$rid\&/) {
       $beenhere.=$rid.'&';  

       if (defined($hash{'is_map_'.$rid})) {
           if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
               (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
	       $sofar=
                &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},
                '&'.$hash{'map_finish_'.$hash{'src_'.$rid}}.'&');
               $sofar++;
               if (defined($rows[$sofar])) {
                   $rows[$sofar].='&'.$hash{'map_finish_'.$hash{'src_'.$rid}};
               } else {
                   $rows[$sofar]=$hash{'map_finish_'.$hash{'src_'.$rid}};
               }
	   }
       } else {
           $sofar++;
           if (defined($rows[$sofar])) {
               $rows[$sofar].='&'.$rid;
           } else {
               $rows[$sofar]=$rid;
           }
       }

       if (defined($hash{'to_'.$rid})) {
          map {
              my $now=&tracetable($sofar,$hash{'goesto_'.$_},$beenhere);
              if ($now>$further) { $further=$now; }
          } split(/\,/,$hash{'to_'.$rid});
       }
    }
    return $further;
}


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

sub handler {
  my $r=shift;

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

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

  return OK if $r->header_only;

  my $requrl=$r->uri;
# ----------------------------------------------------------------- Tie db file
  if ($ENV{'request.course.fn'}) {
      my $fn=$ENV{'request.course.fn'};
      if (-e "$fn.db") {
          if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT,0640)) {
# ------------------------------------------------------------------- Hash tied
              my $firstres=$hash{'map_start_'.$requrl};
              my $lastres=$hash{'map_finish_'.$requrl};
              if (($firstres) && ($lastres)) {
# ----------------------------------------------------------------- Render page

		  $r->print("<h2>All is cool.</h2>");

                  @rows=();
                  &tracetable(0,$firstres,'&'.$lastres.'&');
                  $rows[$#rows+1]=''.$lastres;

                  my $i;
                  for ($i=0;$i<=$#rows;$i++) {
                      $r->print($i.' - '.$rows[$i].'<br>');
                  }

# ------------------------------------------------------------- End render page
              } else {
		  $r->print("<h2>Page undefined.</h2>");
              }
# ------------------------------------------------------------------ Untie hash
              unless (untie(%hash)) {
                   &Apache::lonnet::logthis("<font color=blue>WARNING: ".
                       "Could not untie coursemap $fn (browse).</font>"); 
              }
# -------------------------------------------------------------------- All done
	      return OK;
# ----------------------------------------------- Errors, hash could no be tied
          }
      } 
  }
  $ENV{'user.error.msg'}="$requrl:bre:1:1:Course not initialized";
  return HTTP_NOT_ACCEPTABLE; 
}

1;
__END__