# The LearningOnline Network with CAPA
# Server for RAT Maps
#
# (Edit Handler for RAT Maps
# (TeX Content Handler
#
# 05/29/00,05/30 Gerd Kortemeyer)
# 7/1 Gerd Kortemeyer)
# 7/1,7/3,7/4,7/7,7/8,7/10,7/26,10/2 Gerd Kortemeyer
# 4/30/2001 Scott Harrison
# 5/3,06/25 Gerd Kortemeyer

package Apache::lonratsrv;

use strict;
use Apache::Constants qw(:common);
use Apache::File;
use HTML::TokeParser;


# ------------------------------------------------------------- From RAT to XML

sub qtescape {
    my $str=shift;
    $str=~s/\&\#58\;/\:/g;
    $str=~s/\&\#39\;/\'/g;
    $str=~s/\&\#44\;/\,/g;
    $str=~s/\"/\&\#34\;/g;
    return $str;
}

# ------------------------------------------------------------- From XML to RAT

sub qtunescape {
    my $str=shift;
    $str=~s/\:/\&\#58\;/g;
    $str=~s/\'/\&\#39\;/g;
    $str=~s/\,/\&\#44\;/g;
    $str=~s/\"/\&\#34\;/g;
    return $str;
}

# --------------------------------------------------------- Loads map from disk

sub loadmap {
    my ($fn,$errtext)=@_;
    my $outstr='';
    my @content=();
    my @obj=();
    my @links=();
    if (-e $fn) {
        {
	    my $fh=Apache::File->new($fn);
            @content=<$fh>;
        }
        my $instr=join('',@content);
        my $parser = HTML::TokeParser->new(\$instr);
        my $token;
        my $graphmode=0;

        $fn=~/\.(\w+)$/;
        $outstr="mode<:>$1";

        while ($token = $parser->get_token) {
	    if ($token->[0] eq 'S') {
                if ($token->[1] eq 'map') {
		    $graphmode=($token->[2]->{'mode'} eq 'rat/graphical');
                } elsif ($token->[1] eq 'resource') {
# -------------------------------------------------------------------- Resource
                    $outstr.='<&>objcont';
                    if ($token->[2]->{'id'}) {
			$outstr.='<:>'.$token->[2]->{'id'};
                        if ($obj[$token->[2]->{'id'}]==1) {
                           $errtext.='Error: multiple use of ID '.
                                     $token->[2]->{'id'}.'. ';
                        }
                        $obj[$token->[2]->{'id'}]=1; 
                    } else {
                        my $i=1;
                        while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
                        $outstr.='<:>'.$i;
                        $obj[$i]=1;
                    }
                    $outstr.='<:>';
                    $outstr.=qtunescape($token->[2]->{'title'}).":";
                    $outstr.=qtunescape($token->[2]->{'src'}).":";
                    if ($token->[2]->{'src'}=~/\/\//) {
                        $outstr.='true:';
                    } else {
                        $outstr.='false:';
                    }
                    if ($token->[2]->{'type'}) {
			$outstr.=$token->[2]->{'type'}.':';
                    }  else {
                        $outstr.='normal:';
                    }
                    $outstr.='res';
                } elsif ($token->[1] eq 'condition') {
# ------------------------------------------------------------------- Condition
                    $outstr.='<&>objcont';
                    if ($token->[2]->{'id'}) {
			$outstr.='<:>'.$token->[2]->{'id'};
                        if ($obj[$token->[2]->{'id'}]==1) {
                           $errtext.='Error: multiple use of ID '.
                                     $token->[2]->{'id'}.'. ';
                        }
                        $obj[$token->[2]->{'id'}]=1; 
                    } else {
                        my $i=1;
                        while (($i<=$#obj) && ($obj[$i]!=0)) { $i++; }
                        $outstr.='<:>'.$i;
                        $obj[$i]=1;
                    }
                    $outstr.='<:>';
                    $outstr.=qtunescape($token->[2]->{'value'}).':';
                    if ($token->[2]->{'type'}) {
			$outstr.=$token->[2]->{'type'}.':';
                    } else {
                        $outstr.='normal:';
                    }
                    $outstr.='cond';
                } elsif ($token->[1] eq 'link') {
# ----------------------------------------------------------------------- Links
                    $outstr.='<&>objlinks';

                        if ($token->[2]->{'index'}) {
			   if ($links[$token->[2]->{'index'}]) {
                               $errtext.='Error: multiple use of link index '.
			       $token->[2]->{'index'}.'. ';
                           }
			   $outstr.='<:>'.$token->[2]->{'index'};
                           $links[$token->[2]->{'index'}]=1;
                        } else {
                           my $i=1;
                           while (($i<=$#links) && ($links[$i]==1)) { $i++; }
                           $outstr.='<:>'.$i;
                           $links[$i]=1;
		       }
		    
                    $outstr.='<:>'.$token->[2]->{'from'}.
                             ':'.$token->[2]->{'to'};
                    if ($token->[2]->{'condition'}) {
			$outstr.=':'.$token->[2]->{'condition'};
                    } else {
 			$outstr.=':0';
                    }
# ------------------------------------------------------------------- Parameter
                } elsif ($token->[1] eq 'param') {
                    $outstr.='<&>objparms<:>'.$token->[2]->{'to'}.'<:>'.
                             $token->[2]->{'type'}.'___'.$token->[2]->{'name'}                                                   
                                                 .'___'.$token->[2]->{'value'};
                } elsif ($graphmode) {
# --------------------------------------------- All other tags (graphical only)
                    $outstr.='<&>'.$token->[1];
                    if (defined($token->[2]->{'index'})) {
			$outstr.='<:>'.$token->[2]->{'index'};
                        if ($token->[1] eq 'obj') {
			    $obj[$token->[2]->{'index'}]=2;
                        }
                    }
                    $outstr.='<:>'.$token->[2]->{'value'};
                }
            }
        }

    } else {
        $errtext.='Map not loaded: The file does not exist. ';
    }
    return($outstr,$errtext);
}


# ----------------------------------------------------------- Saves map to disk

sub savemap {
    my ($fn,$errtext)=@_;
    if (($fn=~/\.sequence$/) ||
        ($fn=~/\.page$/)) {

# ------------------------------------------------------------- Deal with input
        my @tags=split(/<&>/,$ENV{'form.output'});
        my $outstr='';
        my $graphdef=0;
        if ($tags[0] eq 'graphdef<:>yes') {
	    $outstr='<map mode="rat/graphical">'."\n";
            $graphdef=1;
        } else {
            $outstr="<map>\n";
        }
        map {
	   my @parts=split(/<:>/,$_);
           if ($parts[0] eq 'objcont') {
               my @comp=split(/:/,$parts[$#parts]);
# --------------------------------------------------------------- Logical input
	       if ($comp[$#comp] eq 'res') {
                   $comp[0]=qtescape($comp[0]);
                   $comp[1]=qtescape($comp[1]);
                   if ($comp[2] eq 'true') {
		       if ($comp[1]!~/^http\:\/\//) {
			   $comp[1]='http://'.$comp[1];
                       }
                   } else {
		       if ($comp[1]=~/^http\:\/\//) {
			   $comp[1]=~s/^http\:\/\/[^\/]*\//\//;
                       }
                   }
		   $outstr.='<resource id="'.$parts[1].'" src="'
                          .$comp[1].'"';

                   if (($comp[3] ne '') && ($comp[3] ne 'normal')) {
		       $outstr.=' type="'.$comp[3].'"';
                   }
                   if ($comp[0] ne '') {
		       $outstr.=' title="'.$comp[0].'"';
                   }
                   $outstr.="></resource>\n";
               } elsif ($comp[$#comp] eq 'cond') {
                   $outstr.='<condition id="'.$parts[1].'"';
                   if (($comp[1] ne '') && ($comp[1] ne 'normal')) {
		       $outstr.=' type="'.$comp[1].'"';
                   }
                   $outstr.=' value="'.qtescape($comp[0]).'"';
                   $outstr.="></condition>\n";
               }
           } elsif ($parts[0] eq 'objlinks') {
               my @comp=split(/:/,$parts[$#parts]);
               $outstr.='<link';
               $outstr.=' from="'.$comp[0].'"';
               $outstr.=' to="'.$comp[1].'"';
               if (($comp[2] ne '') && ($comp[2]!=0)) {
                  $outstr.=' condition="'.$comp[2].'"';
               }
               $outstr.=' index="'.$parts[1].'"';
               $outstr.="></link>\n";
           } elsif ($parts[0] eq 'objparms') {
               map {
                   my ($type,$name,$value)=split(/\_\_\_/,$_);
                   $outstr.='<param to="'.$parts[1].'" type="'.$type.'"'
                          .' name="'.$name.'" value="'.$value.'">'."\n";
               } split(/:/,$parts[$#parts]);
           } elsif (($parts[0] ne '') && ($graphdef)) {
# ------------------------------------------------------------- Graphical input
               $outstr.='<'.$parts[0];
               if ($#parts==2) {
		   $outstr.=' index="'.$parts[1].'"';
               }
               $outstr.=' value="'.qtescape($parts[$#parts]).'"></'.
                        $parts[0].">\n";
           }
        } @tags;
        $outstr.="</map>\n";
        {
          my $fh;
          if ($fh=Apache::File->new(">$fn")) {
             print $fh $outstr;
             $errtext.="Map saved as $fn. ";
	  } else {
             $errtext.='Could not write file $fn. Map not saved. ';
	  }
        }
    } else {
# -------------------------------------------- Cannot write to that file, error
        $errtext.='Map not saved: The specified path does not exist. ';
    }
    return $errtext;
}

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

sub handler {
  my $r=shift;
  $r->content_type('text/html');
  $r->send_http_header;

  return OK if $r->header_only;

  my $url=$r->uri;
  $url=~/\/(\w+)\/ratserver$/;
  my $mode=$1;

  $url=~s/\/loadonly\/ratserver$/\/save\/ratserver/;
  
  my $fn=$r->filename;
  my $errtext='';
  my $outtext='';

  if ($mode ne 'loadonly') {
     $errtext=&savemap($fn,$errtext);
  }
  ($outtext,$errtext)=&loadmap($fn,$errtext);

  $r->print(<<ENDDOCUMENT);
<html>
<body bgcolor="#FFFFFF">
<form name=storage method=post action="$url">
<input type=hidden name=output value="$outtext">
</form>
<script>
    parent.flag=1;
</script>
ENDDOCUMENT
    if ($errtext ne '') {
	$r->print(<<ENDSCRIPT);
<script>
    alert("$errtext");
</script>
ENDSCRIPT
    }
    $r->print("</body>\n</html>\n");

  return OK;
}

1;
__END__
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>