# The LearningOnline Network with CAPA
# Homework Performance Chart
#
# (Navigate Maps Handler
#
# (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 Gerd Kortemeyer)
#
# 1/31 Gerd Kortemeyer

package Apache::lonchart;

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

# -------------------------------------------------------------- Module Globals
my %hash;
my @cols;
my @rowlabels;
my @students;

# ------------------------------------------------------------- Find out status

sub astatus {
    my ($rid,$student)=@_;
    my ($uname,$udom)=split(/\:/,$student);
    my $code=' ';
    $rid=~/(\d+)\.(\d+)/;
    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
	     &Apache::lonnet::declutter($hash{'src_'.$rid});
    my $answer=&Apache::lonnet::reply(
              "restore:$udom:$uname:".
              $ENV{'request.course.id'}.':'.
              &Apache::lonnet::escape($symb),
              &Apache::lonnet::homeserver($uname,$udom));
    my %returnhash=();
    map {
	my ($name,$value)=split(/\=/,$_);
        $returnhash{&Apache::lonnet::unescape($name)}=
                    &Apache::lonnet::unescape($value);
    } split(/\&/,$answer);
    if ($returnhash{'version'}) {
       my $version;
       for ($version=1;$version<=$returnhash{'version'};$version++) {
          map {
             $returnhash{$_}=$returnhash{$version.':'.$_};
          } split(/\:/,$returnhash{$version.':keys'});
       }
       my $totaltries=0;
       map {
           if (($_=~/\.(\w+)\.solved$/) && ($_!~/^\d+\:/)) {
               my $part=$1;
	       if ($returnhash{$_} eq 'correct_by_student') {
                   unless (($code eq '.') || ($code eq '-')) { $code='*'; }
                   $totaltries+=$returnhash{'resource.'.$part.'.tries'};
               } elsif ($returnhash{$_} eq 'correct_by_override') {
                   unless (($code eq '.') || ($code eq '-')) { $code='+'; }
               } elsif ($returnhash{$_} eq 'incorrect_attempted') {
                   $code='.';
               } elsif ($returnhash{$_} eq 'incorrect_by_override') {
                   $code='-';
               } elsif ($returnhash{$_} eq 'excused') {
                   unless (($code eq '.') || ($code eq '-')) { $code='x'; }
               }
           }
       } keys %returnhash;
       if (($code eq '*') && ($totaltries<10)) { $code="$totaltries"; }
    }
    return $code;
}

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

sub tracetable {
    my ($rid,$beenhere)=@_;
    unless ($beenhere=~/\&$rid\&/) {
       $beenhere.=$rid.'&';  
       if (defined($hash{'is_map_'.$rid})) {
           if ($hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}} 
            eq 'sequence') { 
               $cols[$#cols+1]=0; 
           }
           if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
               (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
              my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};

                &tracetable($hash{'map_start_'.$hash{'src_'.$rid}},
                '&'.$frid.'&');

              if ($hash{'src_'.$frid}) {
                 if ($hash{'src_'.$frid}=~
                                 /\.(problem|exam|quiz|assess|survey|form)$/) {
		     $cols[$#cols+1]=$frid;
                 }
	      }

	   }
       } else {
          if ($hash{'src_'.$rid}) {
             if ($hash{'src_'.$rid}=~
                                 /\.(problem|exam|quiz|assess|survey|form)$/) {
	         $cols[$#cols+1]=$rid;
             }
          }
       }
       if (defined($hash{'to_'.$rid})) {
          map {
              &tracetable($hash{'goesto_'.$_},$beenhere);
          } split(/\,/,$hash{'to_'.$rid});
       }
    }
}

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

sub handler {
  my $r=shift;

  if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
# ------------------------------------------- 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;
# ----------------------------------------------------------------- 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_READER,0640)) {
# ------------------------------------------------------------------- Hash tied


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

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

             $r->content_type('text/html');
             $r->send_http_header;
             $r->print(
  '<html><head><title>LON-CAPA Assessment Chart</title></head>');

	     $r->print('<body bgcolor="#FFFFFF">'.
                                    '<script>window.focus();</script>'.
                           '<img align=right src=/adm/lonIcons/lonlogos.gif>'.
                                    '<h1>Assessment Chart</h1>');

# ---------------------------------------------------------------- Course title

    $r->print('<h1>'.
            $ENV{'course.'.$ENV{'request.course.id'}.'.description'}.'</h1>');


# ------------------------------- This is going to take a while, produce output

             $r->rflush();

# ----------------------- Get first and last resource, see if there is anything


              my $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
              my $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
              if (($firstres) && ($lastres)) {
# ----------------------------------------------------------------- Render page

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

# ---------------------------------------------- Read class list and row labels

    undef @rowlabels;
    undef @students;

    my $classlst=&Apache::lonnet::reply
                                 ('dump:'.$cdom.':'.$cnum.':classlist',$chome);
    my $now=time;
    unless ($classlst=~/^error\:/) {
        map {
            my ($name,$value)=split(/\=/,$_);
            my ($end,$start)=split(/\:/,&Apache::lonnet::unescape($value));
            my $active=1;
            if (($end) && ($now>$end)) { $active=0; }
            if ($active) {
                my $thisindex=$#students+1;
                $name=&Apache::lonnet::unescape($name);
                $students[$thisindex]=$name;
                my ($sname,$sdom)=split(/\:/,$name);
                my $ssec=&Apache::lonnet::usection($sdom,$sname,$cid);
                if ($ssec==-1) {
                    $rowlabels[$thisindex]=
                      'Data not available: '.$name;
                } else {
                    my %reply=&Apache::lonnet::idrget($sdom,$sname);
		    my $reply=&Apache::lonnet::reply('get:'.$sdom.':'.$sname.
                                                     ':environment:lastname&generation&firstname&middlename',
                                                     &Apache::lonnet::homeserver($sname,$sdom));
                    $rowlabels[$thisindex]=
                      sprintf('%3s',$ssec).' '.$reply{$sname}.' ';
                    my $i=0;
                    map {
                      $i++;
                      if ( $_ ne '') {
                        $rowlabels[$thisindex].=&Apache::lonnet::unescape($_).' ';
                      }
                      if ($i == 2) {
                        chop($rowlabels[$thisindex]);
                        $rowlabels[$thisindex].=', ';
                      }
                    } split(/\&/,$reply);

                }
            }
        } sort split(/\&/,$classlst);

    } else {
        $r->print('<h1>Could not access course data</h1>');
    }

    my $allstudents=$#students+1;
    $r->print('<h3>'.$allstudents.' students</h3>');
    $r->rflush();

# --------------- Find all assessments and put them into some linear-like order

   &tracetable($firstres,'&'.$lastres.'&');

# ----------------------------------------------------------------- Start table

                          $r->print('<p><pre>');
 			  my $index;
                           for ($index=0;$index<=$#students;$index++) {
                              $r->print(
                                       substr($students[$index].
       '                                                        ',0,14).' ! '.
        			       substr($rowlabels[$index].
       '                                                        ',0,45).' ! ');
                              map {
                                  if ($_) {
                                     $r->print(&astatus($_,$students[$index]));
                                  } else {
                                     $r->print(' ! ');
                                  }
                              } @cols;
                              $r->print("\n");
                              $r->rflush();
                          }
                          $r->print('</pre>');

	     } else {
                 $r->print('<h3>Undefined course sequence</h3>');
             }

                      $r->print('</body></html>');
                                     
# ------------------------------------------------------------- End render page
              } else {
                  $r->content_type('text/html');
                  $r->send_http_header;
		  $r->print('<html><body>Coursemap undefined.</body></html>');
              }
# ------------------------------------------------------------------ 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
      }
  } else {
  $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
  return HTTP_NOT_ACCEPTABLE; 
}
} else {
      $ENV{'user.error.msg'}=
        $r->uri.":vgr:0:0:Cannot view grades for complete course";
      return HTTP_NOT_ACCEPTABLE; 

}
}
1;
__END__