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# The LearningOnline Network with CAPA
# Handler to set parameters for assessments
#
# (Handler to resolve ambiguous file locations
#
# (TeX Content Handler
#
# 05/29/00,05/30,10/11 Gerd Kortemeyer)
#
# 10/11,10/12,10/16 Gerd Kortemeyer)
#
# 11/20,11/21 Gerd Kortemeyer

package Apache::lonparmset;

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

my %courseopt;
my %useropt;
my %bighash;
my %parmhash;

my @srcp;
my @typep;
my @resp;
my @mapp;
my @symbp;

my $uname;
my $udom;
my $uhome;

my $csec;

# -------------------------------------------- Figure out a cascading parameter

sub parmval {
    my ($what,$idx)=@_;
# ----------------------------------------------------- Cascading lookup scheme
       my $symbparm=$symbp[$idx].'.'.$what;
       my $reslevel=
	    $ENV{'request.course.id'}.'.'.$symbparm;
       my $seclevel=
            $ENV{'request.course.id'}.'.'.
		$ENV{'request.course.sec'}.'.'.$what;
       my $courselevel=
            $ENV{'request.course.id'}.'.'.$what;

# ----------------------------------------------------------- first, check user

       if ($useropt{$reslevel}) { return $useropt{$reslevel}; }
       if ($useropt{$seclevel}) { return $useropt{$seclevel}; }
       if ($useropt{$courselevel}) { return $useropt{$courselevel}; }

# -------------------------------------------------------- second, check course

       if ($courseopt{$reslevel}) { return $courseopt{$reslevel}; }
       if ($courseopt{$seclevel}) { return $courseopt{$seclevel}; }  
       if ($courseopt{$courselevel}) { return $courseopt{$courselevel}; }

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

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

     
# --------------------------------------------- last, look in resource metadata

        my $filename='/home/httpd/res/'.$srcp[$idx].'.meta';
        if (-e $filename) {
            my @content;
            {
             my $fh=Apache::File->new($filename);
             @content=<$fh>;
            }
            if (join('',@content)=~
                 /\<$what[^\>]*\>([^\<]*)\<\/$what\>/) {
	        return $1;
 	    }
        }
    return '';
}

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

sub handler {
   my $r=shift;

   if ($r->header_only) {
      $r->content_type('text/html');
      $r->send_http_header;
      return OK;
   }

# ----------------------------------------------------- Needs to be in a course

   if (($ENV{'request.course.fn'}) && 
       (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'}))) {
# -------------------------------------------------------- Variable declaration

      %courseopt=();
      %useropt=();
      %bighash=();

      @srcp=();
      @typep=();
      @resp=();
      @mapp=();
      @symbp=();

      $uname=$ENV{'form.uname'};
      $udom=$ENV{'form.udom'};
      unless ($udom) { $uname=''; }
      $uhome='';
      if ($uname) {
	  $uhome=&Apache::lonnet::homeserver($uname,$udom);
      }

      $csec=$ENV{'form.csec'};

# ------------------------------------------------------------------- Tie hashs
      if ((tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
                       &GDBM_READER,0640)) &&
          (tie(%parmhash,'GDBM_File',
           $ENV{'request.course.fn'}.'_parms.db',&GDBM_READER,0640))) {

# -------------------------------------------------------------- Get coursedata
        my $reply=&Apache::lonnet::reply('dump:'.
              $ENV{'course.'.$ENV{'request.course.id'}.'.domain'}.':'.
              $ENV{'course.'.$ENV{'request.course.id'}.'.num'}.':resourcedata',
              $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
        if ($reply!~/^error\:/) {
           map {
             my ($name,$value)=split(/\=/,$_);
             $courseopt{unescape($name)}=unescape($value);  
           } split(/\&/,$reply);
        }
# --------------------------------------------------- Get userdata (if present)
        if ($uname) {
           my $reply=
       &Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome);
           if ($reply!~/^error\:/) {
              map {
                my ($name,$value)=split(/\=/,$_);
                $useropt{unescape($name)}=unescape($value);  
              } split(/\&/,$reply);
           }
        }
# --------------------------------------------------------- Get all assessments
        map {
	    if ($_=~/^src\_(\d+)\.(\d+)$/) {
	       my $mapid=$1;
               my $resid=$2;
               if ($bighash{$_}=~/\.(problem|exam|quiz|assess|survey|form)$/) {
                  $typep[$#typep+1]=$1;
                  $mapp[$#mapp+1]=$mapid;
                  $resp[$#resp+1]=$resid;
                  $srcp[$#srcp+1]=&Apache::lonnet::declutter($bighash{$_});
                  $symbp[$#symbp+1]=
		    &Apache::lonnet::declutter($bighash{'map_id_'.$mapid}).
			'___'.$resid.'___'.$srcp[$#srcp];
	       }
            }
        } keys %bighash;
# ------------------------------------------------------------------- Sort this

# ------------------------------------------------------------------ Start page
         $r->content_type('text/html');
         $r->send_http_header;
	 $r->print('<html><body bgcolor="#FFFFFF">');

         $r->print('</body></html>');
         untie(%bighash);
	 untie(%parmhash);
      }
   } else {
# ----------------------------- Not in a course, or not allowed to modify parms
      $ENV{'user.error.msg'}=
        "/adm/flip:opa:0:0:Cannot modify assessment parameters";
      return HTTP_NOT_ACCEPTABLE; 
   }
   return OK;
}

1;
__END__