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Prints date on screen, explains symbols

# 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
#
# 7/10/01 Behrouz Minaei
# 9/8 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 ExtractStudentData {
    my ($index,$coid)=@_;
    my ($sname,$sdom) = split( /\:/, $students[$index] );
    my $shome=&Apache::lonnet::homeserver( $sname,$sdom );          
    my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.':'.$coid,$shome );
    my %result=();
    my $ResId;
    my $Code;
    my $Tries;
    my $Wrongs;
    my $Version;
                
    my $Str=substr($students[$index].
            '                                                        ',0,14).' ! '.
            substr($rowlabels[$index].
            '                                                        ',0,45).' ! ';

    unless ($reply=~/^error\:/) {
        map {
            my ($name,$value)=split(/\=/,&Apache::lonnet::unescape($_));
            $result{$name}=$value;
        } split(/\&/,$reply);
        foreach $ResId (@cols) {
	    if ( !$ResId ) { $Str .= ' ! '; next; }
            $ResId=~/(\d+)\.(\d+)/;
            my $Prob = &Apache::lonnet::declutter( $hash{'map_id_'.$1} ).
                       '___'.$2.'___'.
                       &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
            $Code=' ';
            $Tries = 0;
  	    $Version = $result{"version:$Prob"};            
            if ( $Version ) {
                my $vkeys = $result{"$Version:keys:$Prob"};
                my @keys = split(/:/,$vkeys);
                foreach my $Key (@keys) {
                    if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
                        my $Part = $1;
                        $Tries = $result{"$Version:$Prob:resource.$Part.tries"};
                        my $Val = $result{"$Version:$Prob:$Key"};
	                if ($Val eq 'correct_by_student'){$Code='*';} 
                        elsif ($Val eq 'correct_by_override'){$Code = '+';}                        
                        elsif ($Val eq 'incorrect_attempted'){$Code = '.';} 
                        elsif ($Val eq 'incorrect_by_override'){$Code = '-';}
                        elsif ($Val eq 'excused'){$Code = 'x';}
      		    }
                    if (($Code eq '*')&&($Tries<10)){$Code=$Tries;}
                } 
            }   
            $Str .= $Code; 
        } 
    }
    return $Str;
}

#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><h3>'.
    localtime()."</h3><p><pre>1..9: correct by student in 1..9 tries\n".
                            "   *: correct by student in more than 9 tries\n".
	                    "   +: correct by override\n".
                            "   -: incorrect by override\n".
	                    "   .: incorrect attempted\n".
                            "    : not attempted\n".
	                    "   x: excused</pre><p>");
  
# ------------------------------- 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");
                              $r->print(&ExtractStudentData($index,$cid).'<br>');
                              $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__