--- loncom/interface/lonstatistics.pm	2002/05/31 16:02:11	1.26
+++ loncom/interface/lonstatistics.pm	2002/07/29 21:00:53	1.35
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # (Publication Handler
 #
-# $Id: lonstatistics.pm,v 1.26 2002/05/31 16:02:11 minaeibi Exp $
+# $Id: lonstatistics.pm,v 1.35 2002/07/29 21:00:53 minaeibi Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,1010 +31,377 @@
 # 11/1,11/4,11/16,12/14,12/16,12/18,12/20,12/31 Behrouz Minaei
 # YEAR=2002
 # 1/22,2/1,2/6,2/25,3/2,3/6,3/17,3/21,3/22,3/26,4/7,5/6 Behrouz Minaei
-# 5/12,5/14,5/15,5/19,5/26 Behrouz Minaei
+# 5/12,5/14,5/15,5/19,5/26,7/16,25/7,29/7  Behrouz Minaei
 #
 ###
 
 package Apache::lonstatistics; 
 
-use strict; 
+use strict;
 use Apache::Constants qw(:common :http);
 use Apache::lonnet();
 use Apache::lonhomework;
 use Apache::loncommon;
+use Apache::loncoursedata;
+use Apache::lonhtmlcommon;
+use Apache::lonproblemanalysis;
+use Apache::lonproblemstatistics;
+use Apache::lonstudentassessment;
+use Apache::lonchart;
 use HTML::TokeParser;
 use GDBM_File;
 
-# -------------------------------------------------------------- Module Globals
-my %hash;
-my %CachData;
-my %GraphDat;
-my %OpResp;
-my %maps;
-my %mapsort;
-my %section;
-my %StuBox;
-my %DiscFac;
-my %DisUp;
-my %DisLow;
-my $UpCnt;
-my $CurMap;
-my $CurSec;
-my $CurStu;
-my @cols;
-my @list;
-my @students;
-my $p_count;
-my $Pos;
-my $r;
-my $OpSel1;
-my $OpSel2;
-my $OpSel3;
-my $OpSel4;
-my $GData;
-my $cid;
-my $firstres;
-my $lastres;
-my $DiscFlag;
-my $HWN;
-my $P_Order;
-my %color;
-my %foil_to_concept;
-my @Concepts;
-my %ConceptData;
-my %Header = (0,"Homework Sets Order",1,"#Stdnts",2,"Tries",3,"Mod",
-              4,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"DoDiff",
-              9,"S.D.",10,"Skew.",11,"D.F.1st",12,"D.F.2nd");
-my %Answer = ();
-
-
-sub Activity {
-    my $file="/home/minaeibi/activity.log";
-    my $userid='adamsde1';
-    $r->print("<br>Using $file");
-    $r->rflush();
-    open(FILEID, "<$file");
-    my $line;
-    my @allaccess;
-    my $Count=0;
-    while ($line=<FILEID>) {
-	my ($time,$machine,$what)=split(':',$line);
-	$what=&Apache::lonnet::unescape($what);
-	my @accesses=split('&',$what);
-	foreach my $access (@accesses) {
-	    my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
-	    if ($who ne $userid) { next; }
-	    if (!$resource) { next; }
-	    my $res=&Apache::lonnet::unescape($resource);
-	    if (($res =~ /\.(problem|htm|html)/)) {
-		$Count++;
-		$r->print("<br>$Count) ".localtime($date).": $who --> $res");
-#	        if ($post) { 
-#		    $Count++;
-#		    $r->print("<br><b>$Count) Sent data ".join(':',
-#                              &Apache::lonnet::unescape(@posts)).'</b>');
-#		}
-		$r->rflush();
-	    }
-	##    push (@allaccess,unescape($access));
-	    #print $machine;
-	}
-    }
-#    @allaccess=sort(@allaccess);
-#    $Count=0;
-#    foreach my $access (@allaccess) {
-#	my ($date,$resource,$who,$domain,$post,@posts)=split(':',$access);
-#	$Count++;
-#	$r->print("<br>$Count) $date: $who --> $resource");
-#	$r->rflush();
-#	if ($post) { 
-#	    $r->print("<br><b>Sent data ".join(':',unescape(@posts)).'</b>');
-#	}
-#    }
-}
 
+sub CheckFormElement {
+    my ($cache, $ENVName, $cacheName, $default)=@_;
 
-
-sub InitAnalysis {
-    my ($rid, $student)=@_;
-    my ($uname,$udom)=split(/\:/,$student);
-    $rid=~/(\d+)\.(\d+)/;
-    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
-	     &Apache::lonnet::declutter($hash{'src_'.$rid});
-    my $URI = $hash{'src_'.$rid};
-    my $Answ=&Apache::lonnet::ssi($URI,('grade_target' => 'analyze',
-                                  'grade_username' => $uname,
-                                  'grade_domain' => $udom,
-                                  'grade_courseid' => $cid,
-                                  'grade_symb' => $symb));
-#    my $Answ=&Apache::lonnet::ssi($URI,('grade_target' => 'analyze'));
-
-    (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
-    %Answer=();
-    %Answer=&Apache::lonnet::str2hash($Answ);
-
-    my $parts='';
-    foreach my $elm (@{$Answer{"parts"}}) {
-	$parts.="$elm,";
-    }
-    chop($parts);
-    my $conc='';
-    foreach my $elm (@{$Answer{"$parts.concepts"}}) {
-	$conc.="$elm@";
-    }
-    chop($conc);
-
-    @Concepts=split(/\@/,$conc);
-    foreach my $concept (@{$Answer{"$parts.concepts"}}) {
-	foreach my $foil (@{$Answer{"$parts.concept.$concept"}}) {
-	    $foil_to_concept{$foil} = $concept;
-	    #$ConceptData{$foil} = $Answer{"$parts.foil.value.$foil"};
-	}
+    if(defined($ENV{'form.'.$ENVName})) {
+        $cache->{$cacheName} = $ENV{'form.'.$ENVName};
+    } elsif(!defined($cache->{$cacheName})) {
+        $cache->{$cacheName} = $default;
+    }
+
+    return;
+}
+
+sub ProcessFormData{
+    my ($cache)=@_;
+
+    $cache->{'reportKey'} = 'false';
+
+    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                            ['sort','download',
+                                             'reportSelected',
+                                             'StudentAssessmentStudent']);
+    &CheckFormElement($cache, 'Status', 'Status', 'Active');
+    &CheckFormElement($cache, 'postdata', 'reportSelected', 'Class list');
+    &CheckFormElement($cache, 'reportSelected', 'reportSelected', 
+                      'Class list');
+    $cache->{'reportSelected'} = 
+        &Apache::lonnet::unescape($cache->{'reportSelected'});
+    &CheckFormElement($cache, 'DownloadAll', 'DownloadAll', 'false');
+    &CheckFormElement($cache, 'sort', 'sort', 'fullname');
+    &CheckFormElement($cache, 'download', 'download', 'false');
+
+    if(defined($ENV{'form.CreateStudentAssessment'}) ||
+       defined($ENV{'form.NextStudent'}) ||
+       defined($ENV{'form.PreviousStudent'})) {
+        $cache->{'reportSelected'} = 'Student Assessment';
+    }
+    if(defined($ENV{'form.NextStudent'})) {
+        $cache->{'StudentAssessmentMove'} = 'next';
+    } elsif(defined($ENV{'form.PreviousStudent'})) {
+        $cache->{'StudentAssessmentMove'} = 'previous';
+    } else {
+        $cache->{'StudentAssessmentMove'} = 'selected';
+    }
+    &CheckFormElement($cache, 'StudentAssessmentStudent', 
+                      'StudentAssessmentStudent', 'All Students');
+    $cache->{'StudentAssessmentStudent'} = 
+        &Apache::lonnet::unescape($cache->{'StudentAssessmentStudent'});
+    &CheckFormElement($cache, 'DefaultColumns', 'DefaultColumns', 'false');
+
+    if(defined($ENV{'form.Section'})) {
+        my @sectionsSelected = (ref($ENV{'form.Section'}) ?
+                               @{$ENV{'form.Section'}} :
+                                ($ENV{'form.Section'}));
+        $cache->{'sectionsSelected'} = join(':', @sectionsSelected);
+    } elsif(!defined($cache->{'sectionsSelected'})) {
+        $cache->{'sectionsSelected'} = $cache->{'sectionList'};
+    }
+
+    my @headingColumns=();
+    my @sequenceColumns=();
+    my $foundColumn = 0;
+    if(defined($ENV{'form.ReselectColumns'})) {
+        my @reselected = (ref($ENV{'form.ReselectColumns'}) ? 
+                          @{$ENV{'form.ReselectColumns'}}
+                          : ($ENV{'form.ReselectColumns'}));
+        foreach (@reselected) {
+            if(/HeadingColumn/) {
+                push(@headingColumns, $_);
+                $foundColumn = 1;
+            } elsif(/SequenceColumn/) {
+                push(@sequenceColumns, $_);
+                $foundColumn = 1;
+            }
+        }
     }
-    return $symb;
-}
 
+    foreach (keys(%ENV)) {
+        if(/form\.Analyze:::/) {
+#            $cache->{'reportSelected'} = 'Analyze';
+#            $cache->{'reportKey'} = 'Problem Analysis';
+            my ($uri, $title, $part, $problem);
+            (undef, $uri, $title, $part, $problem)=split(':::', $_);
+            $cache->{'AnalyzeURI'}     = $uri;
+            $cache->{'AnalyzeTitle'}   = $title;
+            $cache->{'AnalyzePart'}    = $part;
+            $cache->{'AnalyzeProblem'} = $problem;
+            
+            &CheckFormElement($cache, 'Interval', 'Interval', '1');
+        } elsif(/form\.HeadingColumn/) {
+            my $value = $_;
+            $value =~ s/form\.//;
+            push(@headingColumns, $value);
+            $foundColumn=1;
+        } elsif(/form\.SequenceColumn/) {
+            my $value = $_;
+            $value =~ s/form\.//;
+            push(@sequenceColumns, $value);
+            $foundColumn=1;
+        }
+    }
 
-sub Interval {
-    my ($rid,$part,$symb)=@_;
-    my $Int=$ConceptData{"Interval"};
-    my $due = &Apache::lonnet::EXT('resource.$part.duedate',$symb)+1;
-    my $opn = &Apache::lonnet::EXT('resource.$part.opendate',$symb);
-    my $add=int(($due-$opn)/$Int);
-    $ConceptData{"Int.0"}=$opn;
-    for (my $i=1;$i<$Int;$i++) {
-	$ConceptData{"Int.$i"}=$opn+$i*$add;
-    }
-    $ConceptData{"Int.$Int"}=$due;     
-    for (my $i=0;$i<$Int;$i++) {
-	for (my $n=0; $n<=$#Concepts; $n++ ) {
-	    my $tmp=$Concepts[$n];
-	    $ConceptData{"$tmp.$i.true"}=0;
-	    $ConceptData{"$tmp.$i.false"}=0;
-	}
+    if($foundColumn) {
+        $cache->{'HeadingsFound'} = join(':', @headingColumns);
+        $cache->{'SequencesFound'} = join(':', @sequenceColumns);;
+    }
+    if(!defined($cache->{'HeadingsFound'}) || 
+       $cache->{'DefaultColumns'} ne 'false') {
+        $cache->{'HeadingsFound'}='HeadingColumnFull Name';
+    }
+    if(!defined($cache->{'SequencesFound'}) ||
+       $cache->{'DefaultColumns'} ne 'false') {
+        $cache->{'SequencesFound'}='All Sequences';
+    }
+    $cache->{'DefaultColumns'} = 'false';
+
+    return;
+
+    # Select page to display
+    if(defined($ENV{'form.ProblemStatistics'}) ||
+       defined($ENV{'form.ProblemStatisticsRecalculate'}) || 
+       defined($ENV{'form.DisplayCSVFormat'})) {
+        $cache->{'GoToPage'} = 'ProblemStatistics';
+        &CheckFormElement($cache, 'DisplayCSVFormat',
+                          'DisplayFormat', 'Display Table Format');
+        &CheckFormElement($cache, 'Ascend','ProblemStatisticsAscend',
+                          'Ascending');
+        &CheckFormElement($cache, 'Maps', 'ProblemStatisticsMap', 
+                          'All Maps');
+    } elsif(defined($ENV{'form.ProblemAnalysis'})) {
+        $cache->{'GoToPage'} = 'ProblemAnalysis';
+        &CheckFormElement($cache, 'Interval', 'Interval', '1');
+    } elsif(defined($ENV{'form.DoDiffGraph'})) {
+        $cache->{'GoToPage'} = 'DoDiffGraph';
+    } elsif(defined($ENV{'form.PercentWrongGraph'})) {
+        $cache->{'GoToPage'} = 'PercentWrongGraph';
+    } elsif(defined($ENV{'form.ActivityLog'})) {
+        $cache->{'GoToPage'} = 'ActivityLog';
+    } else {
+        $cache->{'GoToPage'} = 'Menu';
     }
-}
 
+    &CheckFormElement($cache, 'Status', 'Status', 'Active');
 
-sub ShowOpGraph {
-    my ($InpStr, $Int_No)=@_;
-    my ($rid,$part)=split(/\:/,substr($InpStr,8));
-    $ConceptData{"Interval"}=$Int_No;
-    #Initialize the option response true answers
-    my $symb=&InitAnalysis($rid,$students[0]);
-    #compute the intervals
-    &Interval($rid,$part,$symb);
-    my $URI = $hash{'src_'.$rid};
-    my $Src = $hash{'title_'.$rid};
-    $Src =~ s/\ /"_"/eg;
-    $r->print('<br><b>'.$URI.'</b>');
-    $r->rflush();
-    
-    #Java script Progress window
-    &Create_PrgWin();
-    &Update_PrgWin("Starting to analyze problem");
-    for (my $index=0;$index<=$#students;$index++) {
-	&Update_PrgWin($index);
-	&OpStatus($rid,$students[$index]);
-    }
-    &Close_PrgWin();
-
-    $r->print('<br>');
-    for (my $k=0; $k<$Int_No; $k++ ) {
-	&DrawGraph($k,$Src);
-    }
-    for (my $k=0; $k<$Int_No; $k++ ) {
-	&DrawTable($k);
-    }
-#$Apache::lonxml::debug=1;
-#&Apache::lonhomework::showhash(%ConceptData);
-#$Apache::lonxml::debug=0;
-    my $Answ=&Apache::lonnet::ssi($URI);
-    $r->print("<br><b>Here you can see the Problem:</b><br>$Answ");
+    return;
 }
 
+=pod
 
-sub DrawTable {
-    my $k=shift;
-    my $Max=0;
-    my @data1;
-    my @data2;
-    my $Correct=0;
-    my $Wrong=0;
-    for (my $n=0; $n<=$#Concepts; $n++ ) {
-	my $tmp=$Concepts[$n];
-	$data1[$n]=$ConceptData{"$tmp.$k.true"};
-	$Correct+=$data1[$n];
-	$data2[$n]=$ConceptData{"$tmp.$k.false"};
-	$Wrong+=$data2[$n];
-	my $Sum=$data1[$n]+$data2[$n];
-	if ( $Max<$Sum ) {$Max=$Sum;}
-    }
-    for (my $n=0; $n<=$#Concepts; $n++ ) {
-	if ($data1[$n]+$data2[$n]<$Max) {
-	    $data2[$n]+=$Max-($data1[$n]+$data2[$n]);
-	}
-    }
-    my $P_No = $#data1+1;
-#    $r->print('<br><b>From: ['.localtime($ConceptData{'Int.'.($k-1)}).
-#              '] To: ['.localtime($ConceptData{"Int.$k"}).']</b>'); 
-    my $Str = "\n".'<table border=2>'.
-              "\n".'<tr>'.
-              "\n".'<th> # </th>'.
-	      "\n".'<th> Concept </th>'.
-	      "\n".'<th> Correct </th>'.
-	      "\n".'<th> Wrong </th>'.
-	      "\n".'</tr>';
-
-    for (my $n=0; $n<=$#Concepts; $n++ ) {
-	$Str .= "\n"."<tr>".
-	        "\n"."<td>".($n+1)."</td>".
-                "\n".'<td bgcolor='.$color{"yellow"}.'> '.$Concepts[$n]." </td>".
-                "\n".'<td bgcolor='.$color{"green"}.'> '.$data1[$n]." </td>".
-                "\n".'<td bgcolor='.$color{"red"}.'> '.$data2[$n]." </td>".
-                "\n"."</tr>";
-    }
-    $Str.='<td></td><td><b>From:['.localtime($ConceptData{'Int.'.$k}).
-          '] To: ['.localtime($ConceptData{'Int.'.($k+1)}-1).
-          "]</b></td><td>$Correct</td><td>$Wrong</td>";
-
-    $Str .= "\n".'</table>';
-
-    $r->print($Str);
-#$Apache::lonxml::debug=1;
-#&Apache::lonhomework::showhash(%ConceptData);
-#$Apache::lonxml::debug=0;
-}
+=item &SortStudents()
 
+Determines which students to display and in which order.  Which are 
+displayed are determined by their status(active/expired).  The order
+is determined by the sort button pressed (default to username).  The
+type of sorting is username, lastname, or section.
 
-sub DrawGraph {
-    my ($k,$Src)=@_;
-    my $Max=0;
-    my @data1;
-    my @data2;
-
-    # Adjust Data and find the Max 
-    for (my $n=0; $n<=$#Concepts; $n++ ) {
-	my $tmp=$Concepts[$n];
-	$data1[$n]=$ConceptData{"$tmp.$k.true"};
-	$data2[$n]=$ConceptData{"$tmp.$k.false"};
-	my $Sum=$data1[$n]+$data2[$n];
-	if ( $Max<$Sum ) {$Max=$Sum;}
-    }
-    for (my $n=0; $n<=$#Concepts; $n++ ) {
-	if ($data1[$n]+$data2[$n]<$Max) {
-	    $data2[$n]+=$Max-($data1[$n]+$data2[$n]);
-	}
-    }
-    my $P_No = $#data1+1;
-
-    if ( $Max > 1 ) { 
-	$Max += (10 - $Max % 10);
-	$Max = int($Max);
-    } else { $Max = 1; }
-
-    my $Titr=($ConceptData{'Interval'}>1) ? $Src.'_interval_'.($k+1) : $Src;
-#    $GData=$Titr.'&Concepts'.'&'.'Answers'.'&'.$Max.'&'.$P_No.'&'.$data1.'&'.$data2;
-    $GData="$Titr&Concepts&Answers&$Max&$P_No&".
-           (join(',',@data1)).'&'.(join(',',@data2));
+=over 4
 
-    $r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" border=1/>');
-}
+Input: $students, $CacheData
 
+$students: A array pointer to a list of students (username:domain)
 
-sub AnalyzeProblem {
-    # selecting the number of intervals
-    my $OpSel='';
-    my $CurInt = $ENV{'form.interval'};
-    if ($CurInt eq '') {$CurMap = '1';}
-    my $Ptr = '<br><b>Select number of intervals</b>'."\n".
-       	      '<select name="interval">'."\n";                     	     	     
-    for (my $n=1;$n<=7;$n++) {	          
-	$Ptr .= '<option';
-        if ($CurInt eq $n) {$Ptr .= ' selected';}     
-	$Ptr .= '>'.$n."</option>"."\n";	     
-    }
-    $Ptr .= '</select>'."\n";
-    $r->print( $Ptr );
-
-    #the table of option response problems
-    $r->print('<br><b> Option Response Problems in this course:</b><br><br>');
-    my $Str = "\n".'<table border=2>'.
-              "\n".'<tr>'.
-              "\n".'<th> # </th>'.
-	      "\n".'<th> Problem Title </th>'.
-	      "\n".'<th> Resource </th>'.
-	      "\n".'<th> Address </th>'.
-	      "\n".'</tr>';
-
-     my $P_No=1;
-     foreach (sort keys %OpResp) {
-	 my ($rid,$part)=split(/\:/,$OpResp{$_});
-	 my $Temp = '<a href="'.$hash{'src_'.$rid}.
-                    '" target="_blank">'.$hash{'title_'.$rid}.'</a>';
-	 $Str .= "\n"."<tr>".
-	         "\n"."<td> $P_No </td>".
-                 "\n"."<td bgcolor=".$color{"green"}."> ".$Temp." </td>".
-                 "\n"."<td bgcolor=".$color{"yellow"}."> ".$hash{'src_'.$rid}." </td>".
-	         "\n"."<td> ".'<input type="submit" name="sort" value="'.'Analyze_'.$rid.'" />'.'</td>'.
-                 "\n"."</tr>";
-	 $P_No++;
-     }
-     $Str .= "\n".'</table>';
-     $Str .= "\n".'</form>';
-     $r->print($Str);
-     $r->rflush();	
-}
+$CacheData: A pointer to the hash tied to the cached data
 
+Output: \@order
 
-sub Decide {
-    #deciding the true or false answer belongs to each interval
-    my ($type,$foil,$time)=@_; 
-    my $k=0;
-    while ($time>$ConceptData{'Int.'.($k+1)} && 
-           $k<$ConceptData{'Interval'}) {$k++;}
-    $ConceptData{"$foil_to_concept{$foil}.$k.$type"}++;
-}
+@order: An ordered list of students (username:domain)
+
+=back
+
+=cut
 
+sub SortStudents {
+    my ($cache)=@_;
 
-#restore the student submissions and finding the result
-sub OpStatus {
-    my ($rid,$student)=@_;
-    my ($uname,$udom)=split(/\:/,$student);
-    my $code='U';
-    $rid=~/(\d+)\.(\d+)/;
-    my $symb=&Apache::lonnet::declutter($hash{'map_id_'.$1}).'___'.$2.'___'.
-	     &Apache::lonnet::declutter($hash{'src_'.$rid});
-    my %reshash=&Apache::lonnet::restore($symb,$cid,$udom,$uname);
-    my @True = ();
-    my @False = ();
-    my $flag=0;
-    if ($reshash{'version'}) {
-        my $tries=0;
-	&Apache::lonhomework::showhash(%Answer);
-	for (my $version=1;$version<=$reshash{'version'};$version++) {
-	    my $time=$reshash{"$version:timestamp"};
-	   
-	    foreach my $key (sort(split(/\:/,$reshash{$version.':keys'}))) {
-		if (($key=~/\.(\w+)\.(\w+)\.submission$/)) {
-		    my $Id1 = $1; my $Id2 = $2;
-		    #check if this is a repeat submission, if so skip it
-          	    if ($reshash{"$version:resource.$Id1.previous"}) { next; }
-		    #if no solved this wasn't a real submission, ignore it
-		    if (!defined($reshash{"$version:resource.$Id1.solved"})) {
-			&Apache::lonxml::debug("skipping ");
-			next;
-		    }
-		    my $Resp = $reshash{"$version:$key"};
-		    my %submission=&Apache::lonnet::str2hash($Resp);
-		    foreach (keys %submission) {
-			my $Ansr = $Answer{"$Id1.$Id2.foil.value.$_"};
-			if ($submission{$_}) {
-			    if ($submission{$_} eq $Ansr) {
-				&Decide("true",$_,$time );
-			    }
-			    else {&Decide("false",$_,$time );}
-			}
-		    }
-	        }	  
-	    }
+    my @students = split(':::',$cache->{'NamesOfStudents'});
+    my @sorted1Students=();
+    foreach (@students) {
+        if($cache->{'Status'} eq 'Any' || 
+           $cache->{$_.':Status'} eq $cache->{'Status'}) {
+            push(@sorted1Students, $_);
         }
     }
-}
-
 
-#------- Processing upperlist and lowerlist according to each problem
-sub ProcessDisc {
-    my @List = @_;
-    @List = sort (@List);
-    my $Count = $#List+1;
-    my $Prb;
-    my @Dis;
-    my $Slvd=0;
-    my $tmp;
-    my $Sum1=0;
-    my $Sum2=0;
-    my $nIdx=0;
-    my $nStud=0;
-    my %Proc;
-    undef %Proc;
-    while ($nIdx<$Count) {
-	($Prb,$tmp)=split(/\=/,$List[$nIdx]);
-	@Dis=split(/\+/,$tmp);
-	my $Temp = $Prb;
-	do {
-	    $nIdx++;
-	    $nStud++;
-	    $Sum1 += $Dis[0];
-	    $Sum2 += $Dis[1];
-	    ($Prb,$tmp)=split(/\=/,$List[$nIdx]);
-	    @Dis=split(/\+/,$tmp);
-	} while ( $Prb eq $Temp && $nIdx < $Count );
-#	$Proc{$Temp}=($Sum1/$nStud).':'.$nStud;
-	$Proc{$Temp}=($Sum1/$nStud).':'.($Sum2/$nStud);
-#       $r->print("$nIdx) $Temp --> ($nStud) $Proc{$Temp} <br>");
-	$Sum1=0;
-	$Sum2=0;
-	$nStud=0;
+    my $sortBy = '';
+    if(defined($cache->{'sort'})) {
+        $sortBy = ':'.$cache->{'sort'};
     }
-    return %Proc;
+    my @order = sort { $cache->{$a.$sortBy} cmp $cache->{$b.$sortBy} ||
+                       $cache->{$a.':fullname'} cmp $cache->{$b.':fullname'} } 
+                @sorted1Students;
+
+    return \@order;
 }
 
+=pod
 
-#------- Creating Discimination factor   
-sub Discriminant {
-    my $Count=0;
-    foreach (keys(%DiscFac)){ 
-	$Count++;
-    }
-    $UpCnt = int(0.27*$Count);
-    my $low=0;
-    my $up=$Count-$UpCnt;
-    my @UpList=();
-    my @LowList=();
-    $Count=0;
-    foreach my $key (sort(keys(%DiscFac))){ 
-	$Count++;    
-        #$r->print("<br>$Count) $key = $DiscFac{$key}");
-	if ($low < $UpCnt || $Count > $up) {
-	    $low++;
-	    my $str=$DiscFac{$key};
-	    foreach(split(/\:/,$str)){
-		if ($_) {
-		    if ($low<$UpCnt){push(@LowList,$_);}
-		    else {push(@UpList,$_);}
-		}
-	    }
-	}
-    }
-    %DisUp=&ProcessDisc(@UpList);
-    %DisLow=&ProcessDisc(@LowList);
-}
+=item &SpaceColumns()
 
-   
-sub NumericSort {          
-    $a <=> $b;
-}
+Determines the width of all the columns in the chart.  It is based on
+the max of the data for that column and its header.
 
-# ------ Create different Student Report 
-sub StudentReport {
-    my ($sname,$sdom)=@_;
-    if ( $sname eq 'All Students' ) {
-	$r->print( '<h3><font color=blue>WARNING: 
-                    Please select a student</font></h3>' );
-	return;
-    }
-    my %result = &Apache::lonnet::dump($cid,$sdom,$sname);
-    my $ResId;
-    my $PrOrd;
-    my $Code;
-    my $Tries;
-    my $TotalTries = 0;
-    my $ParCr = 0;
-    my $Wrongs;
-    my %TempHash;
-    my $Version;
-    my $LatestVersion;
-    my $PtrTry='';
-    my $PtrCod='';
-    my $SetNo=0;
-    my $Str = "\n".'<table border=2>'.
-              "\n".'<tr>'.
-              "\n".'<th> # </th>'.
-	      "\n".'<th> Set Title </th>'.
-	      "\n".'<th> Results </th>'.
-	      "\n".'<th> Tries </th>'.
-	      "\n".'</tr>';
-    my ($temp)=keys(%result);
-    unless ($temp=~/^(con_lost|error|no_such_host)/i) {
-        foreach my $CurCol (@cols) {
-	    if (!$CurCol){
-		my $Set=&Apache::lonnet::declutter($hash{'map_id_'.$1});
-		if ( $Set ) {
-		    $SetNo++;
-		    $Str .= "\n"."<tr>".
-			    "\n"."<td> $SetNo </td>".
-                            "\n"."<td> $Set </td>".
-                            "\n"."<td> $PtrCod </td>".
-                            "\n"."<td> $PtrTry</td>".
-                            "\n"."</tr>";
-		}
-		$PtrTry='';
-		$PtrCod='';
-		next; 
-	    }
-	    ($PrOrd,$ResId)=split(/\:/,$CurCol);
-            $ResId=~/(\d+)\.(\d+)/;
-            my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-            if ( $CurMap ne 'All Maps' ) {
-		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
-		if ( $Map ne $ResMap ) { next; }
-	    }
-	    my $meta=$hash{'src_'.$ResId};
-	    my $PartNo = 0;
-	    undef %TempHash;
-	    foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))){
-		if ($_=~/^stores\_(\w+)\_tries$/) {
-                    my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		    if ( $TempHash{"$Part"} eq '' ) { 
-			$TempHash{"$Part"} = $Part;
-			$TempHash{$PartNo}=$Part;
-			$TempHash{"$Part.Code"} = '-';  
-			$TempHash{"$Part.PrOrd"} = $PrOrd+$PartNo;  
-			$PartNo++;
-		    }
-		}
-            }
+=over 4
+
+Input: $students, $studentInformation, $headings, $ChartDB
+
+$students: An array pointer to a list of students (username:domain)
+
+$studentInformatin: The type of data for the student information.  It is
+used as part of the key in $CacheData.
+
+$headings: The name of the student information columns.
 
-            my $Prob = $Map.'___'.$2.'___'.
-                       &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-            $Code='U';
-            $Tries = 0;
-            $Wrongs = 0;
-  	    $LatestVersion = $result{"version:$Prob"};
-	    if ( $LatestVersion ) {
-		for ( my $Version=1; $Version<=$LatestVersion; $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"};
-			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0; 
-			    $TotalTries += $Tries;
-			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
-			    if ( $Val eq 'correct_by_student' )
-                                { $Wrongs = $Tries - 1; $Code = 'Y'; } 
-			    elsif ( $Val eq 'correct_by_override' )
-                                { $Wrongs = $Tries - 1; $Code = 'y'; }                        
-			    elsif ( $Val eq 'incorrect_attempted' || 
-                                $Val eq 'incorrect_by_override' )
-		                { $Wrongs = $Tries; $Code = 'N'; }
-			    $TempHash{"$Part.Code"} = $Code;
-			    $TempHash{"$Part.Wrongs"} = $Wrongs;
-			}
-     		    }
-                }
-		for ( my $n = 0; $n < $PartNo; $n++ ) {		  
-		    my $part = $TempHash{$n};
-		    if ($PtrTry ne '') {$PtrTry .= ',';}
-		    $PtrTry .= "$TempHash{$part.'.Tries'}";
-                    $PtrCod .= "$TempHash{$part.'.Code'}";    
-		}
+$ChartDB: The name of the cache database which is opened for read/write.
+
+Output: None - All data stored in cache.
+
+=back
+
+=cut
+
+sub SpaceColumns {
+    my ($students,$studentInformation,$headings,$cache)=@_;
+
+    # Initialize Lengths
+    for(my $index=0; $index<(scalar @$headings); $index++) {
+        my @titleLength=split(//,$headings->[$index]);
+        $cache->{$studentInformation->[$index].':columnWidth'}=
+            scalar @titleLength;
+    }
+
+    foreach my $name (@$students) {
+        foreach (@$studentInformation) {
+            my @dataLength=split(//,$cache->{$name.':'.$_});
+            my $length=(scalar @dataLength);
+            if($length > $cache->{$_.':columnWidth'}) {
+                $cache->{$_.':columnWidth'}=$length;
             }
-	    else { 
-		for(my $n=0; $n<$PartNo; $n++) { 
-		    if ($PtrTry ne '') {$PtrTry .= ',';}
-		    $PtrTry .= "0";
-                    $PtrCod .= "-"; 
-		}
-	    }
         }
     }
-    $Str .= "\n".'</table>';
-    $r->print($Str);
-    $r->rflush();
-}
 
-sub CreateTable {
-    my ($Hd, $Hid)=@_;
-    if ($ENV{'form.showcsv'}) { 
-	if ( $Hd == 1 ) {
-	    $r->print('<br>"'.$hash{'title_'.$Hid}.'","'.$hash{'src_'.$Hid}.'"');
-	}
-	return;
-    }
-    my $ColNo=0;
-    foreach (keys(%Header)){ 
-	$ColNo++;
-    } 
-    if ( $Hd == 1 ) {
-	$r->print('<br><a href="'.$hash{'src_'.$Hid}.
-                  '" target="_blank">'.$hash{'title_'.$Hid}.'</a>');
-    }
-    my $Result = "\n".'<table border=2>';
-    $Result .= '<tr><th>P#</th>'."\n";
-    for ( my $nIdx=0; $nIdx < $ColNo; $nIdx++ ) { 
-	$Result .= '<th>'.'<input type="submit" name="sort" value="'.
-                   $Header{$nIdx}.'" />'.'</th>'."\n";
-    }
-    $Result .= "\n".'</tr>'."\n";    
-    $r->print( $Result );
-    $r->rflush();
+    return;
 }
 
-sub CloseTable {
-    if ($ENV{'form.showcsv'}) {
-	return;
-    }    
-    $r->print("\n".'</table>'."\n");
-    $r->rflush();
-}
- 
-# ------------------------------------------- Prepare Statistics Table
-sub PreStatTable {
-
-    my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_statistics.db";
-    my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_graph.db";
-    my $OpSel11='';
-    my $OpSel12='';
-    my $OpSel13='';
-    my $Status = $ENV{'form.status'};
-    if ( $Status eq 'Any' ) { $OpSel13='selected'; }
-    elsif ($Status eq 'Expired' ) { $OpSel12 = 'selected'; }
-    else { $OpSel11 = 'selected'; }
-
-    my $Ptr = '';
-    $Ptr .= '<br><b> Student Status: &nbsp; </b>'."\n".
-            '<select name="status">'. 
-            '<option '.$OpSel11.' >Active</option>'."\n".
-            '<option '.$OpSel12.' >Expired</option>'."\n".
-	    '<option '.$OpSel13.' >Any</option> </select> '."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type=submit name=sort value="Recalculate Statistics"/>'."\n";
-
-    $Ptr .= '<br><b> Sorting Type: &nbsp; </b>'."\n".
-            '<select name="order"> <option '.$OpSel1.' >Ascending</option>'."\n".
-	    '<option '.$OpSel2.'>Descending</option> </select> '."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type="submit" name="sort" value="DoDiff Graph" />'."\n";
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-    $Ptr .= '<input type="submit" name="sort" value="%Wrong Graph" />'."\n";
-
-    $Ptr .= '<pre>'.
-    '<b>  #Stdnts</b>: Total Number of Students opened the problem.<br>'. 
-    '<b>  Tries  </b>: Total Number of Tries for solving the problem.<br>'. 
-    '<b>  Mod    </b>: Maximunm Number of Tries for solving the problem.<br>'. 
-    '<b>  Mean   </b>: Average Number of the tries. [ Tries / #Stdnts ]<br>'.
-    '<b>  #YES   </b>: Number of students solved the problem correctly.<br>'. 
-    '<b>  #yes   </b>: Number of students solved the problem by override.<br>'.
-    '<b>  %Wrng  </b>: Percentage of students tried to solve the problem but'.
-    ' still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]<br>'.
-#    '  DoDiff : Degree of Difficulty of the problem. [ Tries/(#YES+#yes+0.1) ]<br>'. Kashy formula
-    '<b>  DoDiff </b>: Degree of Difficulty of the problem. [ 1 - ((#YES+#yes) / Tries) ]<br>'. #Gerd formula
-    '<b>  S.D.  </b> : Standard Deviation of the tries.'.
-    '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)'.
-    ' where Xi denotes every student\'s tries ]<br>'.
-    '<b>  Skew.  </b>: Skewness of the students tries.'.
-	' [ (sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3) ]<br>'.
-    '<b>  Dis.F. </b>: Discrimination Factor: A Standard for '.
-	'evaluating the problem according to a Criterion<br>'.
-	'<b>           [Applied Criterion in %27 Upper Students - '.
-	'Applied the same Criterion in %27 Lower Students]</b><br>'.
-    '<b>           1st Criterion</b> for Sorting the Students: '.
-	'<b>Sum of Partial Credit Awarded / Total Number of Tries</b><br>'.
-    '<b>           2nd Criterion</b> for Sorting the Students: '.
-	'<b>Total number of Correct Answers / Total Number of Tries</b>'.	
-            '</pre>';
-
-    $r->print($Ptr);
-    
-    $r->print('Output CSV format: <input type=checkbox name=showcsv onClick="submit()"');
-    if ($ENV{'form.showcsv'}) { $r->print(' checked'); }
-    $r->print('>');
-
-    $r->rflush();	
-
-    if ((-e "$CacheDB")&&($ENV{'form.sort'} ne 'Recalculate Statistics')) {
-	if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
-	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
-	    &Cache_Statistics();
-        }
-        else {
-	    $r->print("Unable to tie hash to db file");
-        }
+sub PrepareData {
+    my ($c, $cacheDB, $studentInformation, $headings)=@_;
+
+    # Test for access to the cache data
+    my $courseID=$ENV{'request.course.id'};
+    my $isRecalculate=0;
+    if(defined($ENV{'form.Recalculate'})) {
+        $isRecalculate=1;
     }
-    else {
-	if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
-	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
-	    foreach (keys %DiscFac) {delete $CachData{$_};}
-	    foreach (keys %CachData) {delete $CachData{$_};}
-	    $DiscFlag=0;
-	    &Build_Statistics();
-	}
-        else {
-	    $r->print("Unable to tie hash to db file");
-        }
+
+    my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB, 
+                                                         $isRecalculate);
+    if($isCached < 0) {
+        return "Unable to tie hash to db file.";
     }
 
-#    $r->print('Total instances of the problems : '.($p_count*($#students+1)));
-    untie(%CachData);
-    untie(%GraphDat);
-}
+    # Download class list information if not using cached data
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_WRCREAT,0640)) {
+        return "Unable to tie hash to db file.";
+    }
 
+    if(!$isCached) {
+        my $processTopResourceMapReturn=
+            &Apache::loncoursedata::ProcessTopResourceMap(\%cache, $c);
+        if($processTopResourceMapReturn ne 'OK') {
+            untie(%cache);
+            return $processTopResourceMapReturn;
+        }
+    }
 
-# ------------------------------------- Find the section of student in a course
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
 
-sub usection {
-    my ($udom,$unam,$courseid,$ActiveFlag)=@_;
-    $courseid=~s/\_/\//g;
-    $courseid=~s/^(\w)/\/$1/;
-
-    my %result=&Apache::lonnet::dump('roles',$udom,$unam);
-    my ($checkForResult)=keys(%result);
-    if ($checkForResult=~/^(con_lost|error|no_such_host)/i) {
-	return -1;
-    }
-    foreach my $key (keys (%result)) {
-	my $value=$result{$key};
-        if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
-            my $section=$1;
-            if ($key eq $courseid.'_st') { $section=''; }
-	    my ($dummy,$end,$start)=split(/\_/,$value);
-	    if ( $ActiveFlag ne 'Any' ) {
-		my $now=time;
-		my $notactive=0;
-		if ($start) {
-		    if ($now<$start) { $notactive=1; }
-		}
-		if ($end) {
-		    if ($now>$end) { $notactive=1; }
-		}
-		if ((($ActiveFlag eq 'Expired') && $notactive == 1) || 
-                    (($ActiveFlag eq 'Active') && $notactive == 0 ) ) {
-		    return $section;
-		}
-		else { return '-1'; } 
-	    }
-	    return $section;
+    my $classlist=&Apache::loncoursedata::DownloadClasslist($courseID,
+                                                $cache{'ClasslistTimestamp'},
+                                                $c);
+    foreach (keys(%$classlist)) {
+        if(/^(con_lost|error|no_such_host)/i) {
+            untie(%cache);
+            return "Error getting student data.";
         }
     }
-    return '-1';
-}
-
 
-# ------ Dump the Student's DB file and handling the data for statistics table 
-sub ExtractStudentData {
-    my $student=shift;
-    my ($sname,$sdom) = split( /\:/, $student );
-    my %result = &Apache::lonnet::dump($cid,$sdom,$sname);
-    my $ResId;
-    my $PrOrd;
-    my $Dis = '';
-    my $Code;
-    my $Tries;
-    my $ParCr;
-    my $TotalTries = 0;
-    my $TotalOpend = 0;
-    my $ProbSolved = 0;
-    my $ProbTot = 0;
-    my $TimeTot = 0;
-    my $TotParCr = 0;
-    my $Wrongs;
-    my %TempHash;
-    my $Version; 
-    my $LatestVersion;
-    my $SecLimit;
-    my $MapLimit;
-    my ($temp)=keys(%result);
-    unless ($temp=~/^(con_lost|error|no_such_host)/i) {
-        foreach my $CurCol(@cols) {
-	    ($PrOrd,$ResId)=split(/\:/,$CurCol);
-	    if ( !$CurCol ) { next; }
-            $ResId=~/(\d+)\.(\d+)/;
-	    my $MapId=$1;
-	    my $PrbId=$2;
-            my $MapOrg = $hash{'map_id_'.$MapId};
-            my $Map = &Apache::lonnet::declutter($MapOrg);
-            if ( $CurMap ne 'All Maps' ) {
-		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
-		if ( $Map ne $ResMap ) { next; }
-	    }
-	    my $meta=$hash{'src_'.$ResId};
-	    my $PartNo = 0;
-	    $Dis .= ':';
-	    undef %TempHash;
-
-	    foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) { 
-		if ($_=~/^stores\_(\w+)\_tries$/) {
-                    my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		    if ( $TempHash{"$Part"} eq '' ) { 
-			$TempHash{"$Part"} = $Part;
-			$TempHash{$PartNo}=$Part;
-			$TempHash{"$Part.Code"} = 'U';  
-			$TempHash{"$Part.PrOrd"} = $PrOrd+$PartNo;
-			$PartNo++;
-		    }
-                    #my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-		}
-            }
-            &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-	    my $URI = $hash{'src_'.$ResId};
-            my $Prob = $Map.'___'.$PrbId.'___'.
-                       &Apache::lonnet::declutter($URI);
-            $Code='U';
-            $Tries = 0;
-	    $ParCr = 0;
-            $Wrongs = 0;
-  	    $LatestVersion = $result{"version:$Prob"};        
-	    if ( $LatestVersion ) {
-		for ( my $Version=1; $Version<=$LatestVersion; $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"};
-			    $ParCr = $result{"$Version:$Prob:resource.$Part.awarded"};
-			    my $Time = $result{"$Version:$Prob:timestamp"};
-			    $TempHash{"$Part.Time"} = ($Time) ? $Time : 0;
-			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
-			    $TempHash{"$Part.ParCr"} = ($ParCr) ? $ParCr : 0;        
-			    $TotalTries += $TempHash{"$Part.Tries"};
-			    $TotParCr += $TempHash{"$Part.ParCr"};
-			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
-			    if ( $Val eq 'correct_by_student' )
-                               { $Wrongs = $Tries - 1; $Code = 'C'; } 
-			    elsif ( $Val eq 'correct_by_override' )
-                               { $Wrongs = $Tries - 1; $Code = 'O'; }                        
-			    elsif ( $Val eq 'incorrect_attempted' || 
-                                $Val eq 'incorrect_by_override' )
-		               { $Wrongs = $Tries; $Code = 'I'; }
-			    $TempHash{"$Part.Code"} = $Code;
-			    $TempHash{"$Part.Wrongs"} = $Wrongs;
-			}
-     		    }
-                } 
-		for ( my $n = 0; $n < $PartNo; $n++ ) {		  
-		    my $part = $TempHash{$n};
-		    my $Yes = 0;
-                    if ( $TempHash{$part.'.Code'} eq 'C' ||
-                         $TempHash{$part.'.Code'} eq 'O'  ) 
-		       {$ProbSolved++;$Yes=1;}		
-
- #		    my $ptr = "$hash{'title_'.$ResId}";
-		    my $ptr = $TempHash{$part.'.PrOrd'}.'&'.$ResId;
-
-		    if ( $PartNo > 1 ) {                
-			$ptr .= "*(part $part)";
-			$Dis .= '&';
-		    }
-		    my $Fac = ($TempHash{"$part.Tries"}) ? 
-                              ($TempHash{"$part.ParCr"}/$TempHash{"$part.Tries"}) : 0;
-		    my $DisF;
-		    if ( $Fac > 0 &&  $Fac < 1 ) { 
-			$DisF = sprintf( "%.4f", $Fac );
-		    }
-		    else {$DisF = $Fac;}
-#		    $DisF .= '+'.$TempHash{"$part.Time"};33333333
-		    $TimeTot += $TempHash{"$part.Time"};
-		    $Dis .= $TempHash{$part.'.PrOrd'}.'='.$DisF.'+'.$Yes;
-		    $ptr .= "&$TempHash{$part.'.Tries'}".
-		            "&$TempHash{$part.'.Wrongs'}".
-                            "&$TempHash{$part.'.Code'}";
-		    push (@list, $ptr);
-		    $TotalOpend++;
-		    $ProbTot++;
-		}
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    # Active is a temporary solution, remember to change
+    Apache::loncoursedata::ProcessClasslist(\%cache,$classlist,$courseID,$c);
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
+
+    &ProcessFormData(\%cache);
+    my $students = &SortStudents(\%cache);
+    &SpaceColumns($students, $studentInformation, $headings, \%cache);
+    $cache{'updateTime:columnWidth'}=24;
+
+    if($cache{'download'} ne 'false') {
+        my $who = $cache{'download'};
+        my $courseData = 
+            &Apache::loncoursedata::DownloadCourseInformation(
+                                             $who, $courseID, 
+                                             $cache{$who.':lastDownloadTime'});
+        &Apache::loncoursedata::ProcessStudentData(\%cache, $courseData, $who);
+        $cache{'download'} = 'false';
+    } elsif($cache{'DownloadAll'} ne 'false') {
+        my @allStudents;
+        if($cache{'DownloadAll'} eq 'sorted') {
+            @allStudents = @$students;
+        } else {
+            @allStudents = split(':::', $cache{'NamesOfStudents'});
+        }
+        foreach (@allStudents) {
+            my $courseData = 
+                &Apache::loncoursedata::DownloadCourseInformation(
+                                             $_, $courseID, 
+                                             $cache{$_.':lastDownloadTime'});
+            &Apache::loncoursedata::ProcessStudentData(\%cache, $courseData, 
+                                                       $_);
+            if($c->aborted()) {
+                untie(%cache);
+                return 'aborted'; 
             }
-	    #else { 
-		#for(my $n=0; $n<$PartNo; $n++) {
-		#    push (@list, "$TempHash{'0'.'.PrOrd'}.':'.$ResId:0:0:U");
-		#    $ProbTot++; 
-		#}
-	    #}
         }
-	if ( $TotalTries ) {
-	    my $DisFac = ( $TotalTries ) ? ($TotParCr/$TotalTries) : 0;
-	    my $DisFactor = sprintf( "%.4f", $DisFac );
-	    $DiscFac{$DisFactor}=$Dis;
-	    #my $time;
-	    #if ($ProbSolved){
-		#$time = int(($TimeTot/$ProbSolved)-10000000);
-	    #}
-	    #$DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
-            #          $TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
-	}
+        $cache{'DownloadAll'} = 'false';
     }
-    #$r->print($sname.' PrCr= '.$TotParCr.' Slvd= '.$ProbSolved.' Tries='.$TotalTries.'<br>');
-}
 
+    if($c->aborted()) {
+        untie(%cache);
+        return 'aborted'; 
+    }
 
+    untie(%cache);
 
-# ------------------------------------------------------------ Build page table
-sub tracetable {
-    my ($rid,$beenhere)=@_;
-    my $IsMap=0;
-    $rid=~/(\d+)\.(\d+)/;
-    $maps{&Apache::lonnet::declutter($hash{'map_id_'.$1})}='';#$hash{'title_'.$rid}; 
-    #$maps{$HWN}=$hash{'title_'.$rid}; 
-    unless ($beenhere=~/\&$rid\&/) {
-       $beenhere.=$rid.'&'; 
-       if (defined($hash{'is_map_'.$rid})) {
-	   my $cmap=$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}};
-           if ( $cmap eq 'sequence' || $cmap eq 'page' ) { 
-               $cols[$#cols+1]=0;
-	       $P_Order++;
-	       $HWN=$P_Order;
-               $mapsort{$HWN} = $rid.':';
-	       $IsMap=1;
- 
-               #$maps{&Apache::lonnet::declutter($hash{'src_'.$rid})}= 
-               #      $hash{'title_'.$rid}; 
-           }
-           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.'&');
-
-	       $cols[$#cols+1]=($P_Order+1).':'.$frid;
-      
-	       my $meta=$hash{'src_'.$frid};
-	       my $PartNo = 0;
-	       my $Part;
-	#       if ($IsMap==0){
-               if ($meta) {
-		   if ($meta=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-		       foreach (split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
-			   if ($_=~/^stores\_(\w+)\_tries$/) {
-			       $Part=&Apache::lonnet::metadata($meta,$_.'.part');
-			       $P_Order++;
-			       $mapsort{$HWN} .= '&'.$P_Order;
-			       $PartNo++;
-			       #$r->print('<br>'.$PartNo.'---'.$P_Order);
-			   }
-			   foreach my $K(split(/\,/,&Apache::lonnet::metadata($meta,'packages'))) {
-			       if ($K=~/^optionresponse\_($Part)\_(\w+)$/) {
-				   #$r->print('<br>'.$_.'...'.$P_Order.'---'.$Part);
-				   $OpResp{$P_Order}="$frid:$Part";
-			       } 
-			   }
-		       }
-		   }
-               }
-	   }
-	 #  }
-       } else {
-	   $cols[$#cols+1]=($P_Order+1).':'.$rid;
-	   my $meta=$hash{'src_'.$rid};
-	   my $PartNo = 0;
-	   if ($meta) {
-	       if ($meta=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-		   foreach my $Key(split(/\,/,&Apache::lonnet::metadata($meta,'keys'))) {
-		       if ($Key=~/^stores\_(\w+)\_tries$/) {
-			   my $Part=&Apache::lonnet::metadata($meta,$Key.'.part');
-			   $P_Order++;
-			   $mapsort{$HWN} .= '&'.$P_Order;
-			   $PartNo++;
-			   foreach (split(/\,/,&Apache::lonnet::metadata($meta,'packages'))) {
-			       if ($_=~/^optionresponse\_($Part)\_(\w+)$/) {
-				   #$r->print('<br>'.$_.'...'.$P_Order.'---'.$Part);
-				   $OpResp{$P_Order}="$rid:$Part";;
-			       } 
-		   
-			   }
-
-		       }
-		   }
-	       }
-	   }       
-       }
-       if (defined($hash{'to_'.$rid})) {
-          foreach (split(/\,/,$hash{'to_'.$rid})){
-              &tracetable($hash{'goesto_'.$_},$beenhere);
-          }
-       }
-    }
+    return ('OK', $students);
 }
 
-sub MySort {          
-    if ( $Pos > 0 ) {
-	if ($ENV{'form.order'} eq 'Descending') {$b <=> $a;}
-	else { $a <=> $b; }
-    }
-    else {
-	if ($ENV{'form.order'} eq 'Descending') {$b cmp $a;}
-	else { $a cmp $b; }
-    }
-}
 
+# Create progress
 sub Create_PrgWin {
-#----------- Create progress
+    my ($r)=@_;
     $r->print(<<ENDPOP);
     <script>
     popwin=open('','popwin','width=400,height=100');
@@ -1051,669 +418,246 @@ ENDPOP
     $r->rflush();
 }
 
-
+# update progress
 sub Update_PrgWin {
-#----------- update progress
-    my $index = shift;
+    my ($totalStudents,$index,$name,$r)=@_;
     $r->print('<script>popwin.document.popremain.remaining.value="'.
-              'Computing '.($index+1).'/'.($#students+1).': '.
-              $students[$index].'";</script>');
+              'Computing '.$index.'/'.$totalStudents.': '.
+              $name.'";</script>');
     $r->rflush();
 }
 
+# close Progress Line
 sub Close_PrgWin {
-#--------------------- close Progress Line
+    my ($r)=@_;
     $r->print('<script>popwin.close()</script>');
     $r->rflush(); 
 }
 
-sub Build_Statistics {
-    &Create_PrgWin();
-# ---------------------------- Gathering the Data of students' tries
-    for (my $index=0;$index<=$#students;$index++) {
-	&Update_PrgWin($index);
-        &ExtractStudentData($students[$index]);
-    }
-
-# -------------------- sorting the Data
-    $r->print('<script>popwin.document.popremain.remaining.value="'.
-              'Calculating Discrimination Factors...";</script>');
-
-    @list = sort (@list);
 
-    &Discriminant();
+sub BuildClasslist {
+    my ($cacheDB,$students,$studentInformation,$headings)=@_;
 
-    $OpSel2='';
-    $OpSel1='selected';
- 		   
-    $p_count = 0; 
-    my $nIdx = 0;
-    my $dummy; 
-    my $p_val;
-    my $ResId;
-    my $NoElements = $#list + 1;
-#-------------------------------- loop for data representation
-    foreach (sort keys %mapsort) {
-	my ($Hid,$pr)=split(/\:/,$mapsort{$_});
-	my @lpr=split(/\&/,$pr);
-	&CreateTable(1,$Hid);
-	for (my $i=1; $i<=$#lpr; $i++) {
-	    my %storestats=();
-	    my ($PrOrd,$Prob,$Tries,$Wrongs,$Code)=split(/\&/,$list[$nIdx]);
-	    my $Temp = $Prob;
-	    my $MxTries = 0;
-	    my $TotalTries = 0;
-	    my $YES = 0;
-	    my $Incorrect = 0;
-	    my $Override = 0;
-	    my $StdNo = 0;
-	    my @StdLst;
-	    while ( $PrOrd == $lpr[$i] ) 
-	    {
-		$nIdx++;
-		$StdNo++;
-		$StdLst[ $StdNo ] = $Tries;
-		$TotalTries += $Tries;
-		if ( $MxTries < $Tries ) { $MxTries = $Tries; } 
-		if ( $Code eq 'C' ){ $YES++; }
-		elsif( $Code eq 'I' ) { $Incorrect++; }
-		elsif( $Code eq 'O' ) { $Override++; }
-		elsif( $Code eq 'U' ) { $StdNo--; }
-		($PrOrd,$Prob,$Tries,$Wrongs,$Code)=split(/\&/,$list[$nIdx]);
-	    }	
-
-	    $p_count++;
-	    my $Dummy;
-	    ($ResId,$Dummy)=split(/\*/,$Temp);
-
-	    $Temp = '<a href="'.$hash{'src_'.$ResId}.
-                '" target="_blank">'.$hash{'title_'.$ResId}.$Dummy.'</a>';
-
-	    my $res = &Apache::lonnet::declutter($hash{'src_'.$ResId});
-	    my $urlres=$res;
-
-	    $ResId=~/(\d+)\.(\d+)/;
-	    my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-	    $urlres=$Map;
- 
-	    $res = '<a href="'.$hash{'src_'.$ResId}.'">'.$res.'</a>';
-	    #$Map = '<a href="'.$Map.'">'.$res.'</a>';
-
-#------------------------ Compute the Average of Tries about one problem
-	    my $Average = ($StdNo) ? $TotalTries/$StdNo : 0;
-
-	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___timestamp'}=time;       
-	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___stdno'}=$StdNo;
-	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___avetries'}=$Average;
-   
-#-------------------------------- Compute percentage of Wrong tries
-	    my $Wrong = ( $StdNo ) ? 100 * ( $Incorrect / $StdNo ) : 0;
-
-#-------------------------------- Compute Standard Deviation
-	    my $StdDev = 0; 
-	    if ( $StdNo > 1 ) {
-		for ( my $n = 0; $n < $StdNo; $n++ ) {
-		    my $Dif = $StdLst[ $n ]-$Average;
-		    $StdDev += $Dif*$Dif;
-		} 
-		$StdDev /= ( $StdNo - 1 );
-		$StdDev = sqrt( $StdDev );
-	    }
-
-#-------------------------------- Compute Degree of Difficulty
-	    my $DoDiff = 0;
-	    if( $TotalTries > 0 ) {
-		$DoDiff = 1 - ( ( $YES + $Override ) / $TotalTries );
-#	    $DoDiff =  ($TotalTries)/($YES + $Override+ 0.1);	    
-	    }
-       
-	    $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___difficulty'}=$DoDiff;
-
-#-------------------------------- Compute the Skewness
-	    my $Skewness = 0;
-	    my $Sum = 0; 
-	    if ( $StdNo > 0 && $StdDev > 0 ) {
-		for ( my $n = 0; $n < $StdNo; $n++ ) {
-		    my $Dif = $StdLst[ $n ]-$Average;
-		    $Skewness += $Dif*$Dif*$Dif;
-		} 
-		$Skewness /= $StdNo;
-		$Skewness /= $StdDev*$StdDev*$StdDev;
-	    }
-
-#--------------------- Compute the Discrimination Factors
-	    my ($Up1,$Up2)=split(/\:/,$DisUp{$lpr[$i]});
-	    my ($Lw1,$Lw2)=split(/\:/,$DisLow{$lpr[$i]});
-	    my $Dis1 = $Up1 - $Lw1;
-	    my $Dis2 = $Up2 - $Lw2;
-	    my $_D1 = sprintf("%.2f", $Dis1);
-	    my $_D2 = sprintf("%.2f", $Dis2);
-
-#-----------------  Some restition in presenting the float numbers
-	    my $Avg = sprintf( "%.2f", $Average );
-	    my $Wrng = sprintf( "%.1f", $Wrong );
-	    my $SD = sprintf( "%.1f", $StdDev );
-	    my $DoD = sprintf( "%.2f", $DoDiff );
-	    my $Sk = sprintf( "%.1f", $Skewness );
-	    my $join = $lpr[$i].'&'.$Temp.'&'.$StdNo.'&'.
-                       $TotalTries.'&'.$MxTries.'&'.$Avg.'&'.
-                       $YES.'&'.$Override.'&'.$Wrng.'&'.$DoD.'&'.
-		       $SD.'&'.$Sk.'&'.$_D1.'&'.$_D2.'&'.
-                       $Prob;
-	    $CachData{($p_count-1)}=$join;
-
-	    $urlres=~/^(\w+)\/(\w+)/;
-	    if ($StdNo) { 
-		&Apache::lonnet::put('resevaldata',\%storestats,$1,$2); 
-	    }
-#-------------------------------- Row of statistical table
-	    if ( $DiscFlag == 0 ) {
-		&TableRow($join,$i,($p_count-1));
-	    } 
-	}
-	&CloseTable();
-    }
-    &Close_PrgWin();
-}
-
-sub Cache_Statistics {
-    my @list = ();
-    my $Useful;
-    my $UnUseful;
-#    $r->print('<input type="hidden" name="show" value="excel" />'."\n"); 
-    my %myHeader = reverse( %Header );
-    $Pos = $myHeader{$ENV{'form.sort'}};
-    if ($Pos > 0) {$Pos++;}
-    $p_count = 0;
-    foreach my $key( keys %CachData) { 
-	my @Temp=split(/\&/,$CachData{$key});
-	if ( $Pos == 0 ) {
-	    ($UnUseful,$Useful)=split(/\>/,$Temp[$Pos]);
-	}
-	else {
-	    $Useful = $Temp[$Pos];
-	}   
-	$list[$p_count]=$Useful.'@'.$CachData{$key};
-        $p_count++;
-    }
-
-    @list = sort MySort (@list);
-
-    my $nIdx=0;
-
-    if ( $Pos == 0 ) {
-	foreach (sort keys %mapsort) {
-	    my ($Hid,$pr)=split(/\:/,$mapsort{$_});
-	    &CreateTable(1,$Hid);
-	    my @lpr=split(/\&/,$pr);
-	    for (my $i=1; $i<=$#lpr; $i++) {
-		my($Pre, $Post) = split(/\@/,$list[$nIdx]); 
-		#$r->print('<br>'.$Pre.'---'.$Post);
-		&TableRow($Post,$i,$nIdx);
-		$nIdx++;
-	    }
-	    &CloseTable();
-	}
-    }
-    else {
-	&CreateTable(0);
-	for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
-	    my($Pre, $Post) = split(/\@/,$list[$nIdx]); 
-	    &TableRow($Post,$nIdx,$nIdx);
-	} 
-	&CloseTable();
-    }
-}
+    my %cache;
+    unless(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        return '<html><body>Unable to tie database.</body></html>';
+    }
+
+    my $Str='';
+    $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
+    $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
+
+    my $displayString = '<td align="left"><a href="/adm/statistics?';
+    $displayString .= 'sort=LINKDATA">DISPLAYDATA&nbsp</a></td>'."\n";
+    $Str .= &Apache::lonhtmlcommon::CreateHeadings(\%cache, $studentInformation,
+                                                   $headings, $displayString);
+    $Str .= '</tr>'."\n";
+    my $alternate=0;
+    foreach (@$students) {
+        my ($username, $domain) = split(':', $_);
+        if($alternate) {
+            $Str .= '<tr bgcolor="#ffffe6">';
+        } else {
+            $Str .= '<tr bgcolor="#ffffc6">';
+        }
+        $alternate = ($alternate + 1) % 2;
+        foreach my $data (@$studentInformation) {
+            $Str .= '<td>';
+            if($data eq 'fullname') {
+                $Str .= '<a href="/adm/statistics?reportSelected=';
+                $Str .= &Apache::lonnet::escape('Student Assessment');
+                $Str .= '&StudentAssessmentStudent=';
+                $Str .= &Apache::lonnet::escape($cache{$_.':'.$data}).'">';
+                $Str .= $cache{$_.':'.$data}.'&nbsp';
+                $Str .= '</a>';
+            } elsif($data eq 'updateTime') {
+                $Str .= '<a href="/adm/statistics?reportSelected=';
+                $Str .= &Apache::lonnet::escape('Class list');
+                $Str .= '&download='.$_.'">';
+                $Str .= $cache{$_.':'.$data}.'&nbsp';
+                $Str .= '&nbsp</a>';
+            } else {
+                $Str .= $cache{$_.':'.$data}.'&nbsp';
+            }
 
-sub TableRow {
-    my ($Str,$Idx,$RealIdx)=@_;
-    my($PrOrd,$Temp,$StdNo,$TotalTries,$MxTries,$Avg,$YES,$Override,
-       $Wrng,$DoD,$SD,$Sk,$_D1,$_D2,$Prob)=split(/\&/,$Str);	
-    if ($ENV{'form.showcsv'}) {
-        my ($ResId,$Dummy)=split(/\*/,$Prob);
-        my $Ptr =  "\n".'<br>'.
-               "\n".'"'.($RealIdx+1).'",'.
-               "\n".'"'.$hash{'title_'.$ResId}.$Dummy.'",'.
-               "\n".'"'.$hash{'src_'.$ResId}.'",'.
-               "\n".'"'.$StdNo.'",'.
-               "\n".'"'.$TotalTries.'",'.
-               "\n".'"'.$MxTries.'",'.
-               "\n".'"'.$Avg.'",'.
-               "\n".'"'.$YES.'",'.
-               "\n".'"'.$Override.'",'.
-               "\n".'"'.$Wrng.'",'.
-               "\n".'"'.$DoD.'",'.
-               "\n".'"'.$SD.'",'.
-               "\n".'"'.$Sk.'",'.
-               "\n".'"'.$_D1.'",'.
-	       "\n".'"'.$_D2.'"';
-        $r->print("\n".$Ptr);
-    }
-    else{
-        my $Ptr =  "\n".'<tr>'.
-               "\n".'<td>'.($RealIdx+1).'</td>'.
-          #     "\n".'<td>'.$PrOrd.$Temp.'</td>'.
-               "\n".'<td>'.$Temp.'</td>'.
-               "\n".'<td bgcolor='.$color{"yellow"}.'> '.$StdNo.'</td>'.
-               "\n".'<td bgcolor='.$color{"yellow"}.'>'.$TotalTries.'</td>'.
-               "\n".'<td bgcolor='.$color{"yellow"}.'>'.$MxTries.'</td>'.
-               "\n".'<td bgcolor='.$color{"gb"}.'>'.$Avg.'</td>'.
-               "\n".'<td bgcolor='.$color{"gb"}.'> '.$YES.'</td>'.
-               "\n".'<td bgcolor='.$color{"gb"}.'> '.$Override.'</td>'.
-               "\n".'<td bgcolor='.$color{"red"}.'> '.$Wrng.'</td>'.
-               "\n".'<td bgcolor='.$color{"red"}.'> '.$DoD.'</td>'.
-               "\n".'<td bgcolor='.$color{"green"}.'> '.$SD.'</td>'.
-               "\n".'<td bgcolor='.$color{"green"}.'> '.$Sk.'</td>'.
-               "\n".'<td bgcolor='.$color{"purple"}.'> '.$_D1.'</td>'.
-	       "\n".'<td bgcolor='.$color{"purple"}.'> '.$_D2.'</td>';
-        $r->print("\n".$Ptr.'</tr>' );
+            $Str .= '</td>'."\n";
+        }
     }
-    $GraphDat{$RealIdx}=$DoD.':'.$Wrng;
-}
-
-# ------------------------------------------- Prepare data for Graphical chart
 
-sub GetGraphData {
-    my $ylab = shift;
-    my $Col;
-    my $data='';
-    my $count = 0;
-    my $Max = 0;
-    my $cid=$ENV{'request.course.id'};
-    my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                  "_$ENV{'user.domain'}_$cid\_graph.db";
-    foreach (keys %GraphDat) {delete $GraphDat{$_};}
-    if (-e "$GraphDB") {
-	if (tie(%GraphDat,'GDBM_File',"$GraphDB",&GDBM_READER,0640)) {
-	    if ( $ylab eq 'DoDiff Graph' ) {
-		$ylab = 'Degree-of-Difficulty';
-		$Col = 0;
-	    }
-	    else {
-		$ylab = 'Wrong-Percentage';
-		$Col = 1;
-	    }
-	    foreach (sort NumericSort keys %GraphDat) { 
-		my @Temp=split(/\:/,$GraphDat{$_});
-                my $inf = $Temp[$Col]; 
-		if ( $Max < $inf ) {$Max = $inf;}
-		$data .= $inf.',';
-		$count++;
-	    }
-	    if ( $Max > 1 ) { 
-		$Max += (10 - $Max % 10);
-		$Max = int($Max);
-	    }
-	    else { $Max = 1; }
-            untie(%GraphDat);
-	    my $Course = $ENV{'course.'.$cid.'.description'};
-	    $Course =~ s/\ /"_"/eg;
-	    $GData=$Course.'&'.'Problems'.'&'.$ylab.'&'.$Max.'&'.$count.'&'.$data;
-	}
-	else {
-	    $r->print("Unable to tie hash to db file");
-	}
-    }
-}
+    $Str .= '</tr>'."\n";
+    $Str .= '</table></td></tr></table>'."\n";
 
+    untie(%cache);
 
-sub initial {
-# --------------------------------- Initialize the global varaibles
-    undef @students;
-    undef @cols;
-    undef %maps;
-    undef %section;
-    undef %StuBox;
-    undef @list;
-    undef %CachData;
-    undef %GraphDat;
-    undef %DiscFac;
-    undef %OpResp;
-    undef %ConceptData;
-    undef $CurMap;
-    undef $CurSec;
-    undef $CurStu;
-    undef $p_count;
-    undef $Pos;
-    undef $GData;
-    $DiscFlag=0; 
-    $P_Order=100000;
-    $HWN=$P_Order;
-    &setbgcolor(0);
+    return $Str;
 }
 
-# For loading the colored table for display or un-colored for print
-sub setbgcolor {
-    my $PrintTable=shift;
-    undef %color;
-    if ($PrintTable){
-	$color{"gb"}="#FFFFFF";
-	$color{"red"}="#FFFFFF";
-	$color{"yellow"}="#FFFFFF";
-	$color{"green"}="#FFFFFF";
-	$color{"purple"}="#FFFFFF";
-    } else {
-	$color{"gb"}="#DDFFFF";
-	$color{"red"}="#FFDDDD";
-	$color{"yellow"}="#EEFFCC";
-	$color{"green"}="#DDFFDD";
-	$color{"purple"}="#FFDDFF";
+sub CreateMainMenu {
+    my ($status, $reports)=@_;
+
+    my $Str = '';
+
+    $Str .= '<table border="0"><tbody><tr>'."\n";
+    $Str .= '<td></td><td></td>'."\n";
+    $Str .= '<td align="center"><b>Analysis Reports:</b></td>'."\n";
+    $Str .= '<td align="center"><b>Student Status:</b></td></tr>'."\n";
+    $Str .= '<tr>'."\n";
+    $Str .= '<td align="center"><input type="submit" name="Refresh" ';
+    $Str .= 'value="Refresh" /></td>'."\n";
+    $Str .= '<td align="center"><input type="submit" name="DownloadAll" ';
+    $Str .= 'value="Update All Student Data" /></td>'."\n";
+    $Str .= '<td align="center">';
+    $Str .= '<select name="reportSelected" onchange="document.';
+    $Str .= 'Statistics.submit()">'."\n";
+
+    foreach (sort(keys(%$reports))) {
+        next if($_ eq 'reportSelected');
+        $Str .= '<option name="'.$_.'"';
+        if($reports->{'reportSelected'} eq $reports->{$_}) {
+            $Str .= ' selected=""';
+        }
+        $Str .= '>'.$reports->{$_}.'</option>'."\n";
     }
-}
+    $Str .= '</select></td>'."\n";
 
-#	my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-#                  "_$ENV{'user.domain'}_$cid\_classlist.db";
-#	if (-e "$CacheDB") {
-#	    if (tie(%students,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
-#		&CachClassList();
-#	    }
-#            else {
-#	        $r->print("Unable to tie hash to db file");
-#            }
-#        }
-#        else {
-#	    if (tie(%students,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
-#	        &MakeClassList();
-#	    }
-#            else {
-#	        $r->print("Unable to tie hash to db file");
-#            }
+    $Str .= '<td align="center">';
+    $Str .= &Apache::lonhtmlcommon::StatusOptions($status, 'Statistics');
+    $Str .= '</td>'."\n";
+
+    $Str .= '</tr></tbody></table>'."\n";
+    $Str .= '<hr>'."\n";
+
+    return $Str;
+}
+
+sub BuildStatistics {
+    my ($r)=@_;
+
+    my $c = $r->connection;
+    my @studentInformation=('fullname','section','id','domain','username',
+                            'updateTime');
+    my @headings=('Full Name', 'Section', 'PID', 'Domain', 'User Name',
+                  'Last Updated');
+    my $spacing = '   ';
+    my %reports = ('classlist'          => 'Class list',
+                   'problem_statistics' => 'Problem Statistics',
+                   'student_assessment' => 'Student Assessment',
+                   'reportSelected'     => 'Class list');
+
+    my %cache;
+    my $courseID=$ENV{'request.course.id'};
+    my $cacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
+                  "_$ENV{'user.domain'}_$courseID\_statistics.db";
+
+    my ($returnValue, $students) = &PrepareData($c, $cacheDB, 
+                                                \@studentInformation, 
+                                                \@headings);
+    if($returnValue ne 'OK') {
+        $r->print('<html><body>'.$returnValue."\n".'</body></html>');
+        return OK;
+    }
+
+    my $GoToPage;
+    if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER,0640)) {
+        $GoToPage = $cache{'reportSelected'};
+        $reports{'reportSelected'} = $cache{'reportSelected'};
+#        if(defined($cache{'reportKey'}) && $cache{'reportKey'} ne 'false') {
+#            $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
 #        }
-#        untie(%students);
 
-sub ClassList {
-
-    &GetStatus();
+        if(defined($cache{'OptionResponses'})) {
+            $reports{'problem_analysis'} = 'Problem Analysis';
+        }
 
-    $cid=$ENV{'request.course.id'};
-    my ($cdom,$cnum)=split(/\_/,$cid);
-# ----------------------- Get first and last resource, see if there is anything
-    $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
-    $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
-    if (($firstres) && ($lastres)) {
-
-	my $StudNo = 0;
-	my $now=time;
-	my %classlist=&Apache::lonnet::dump('classlist',$cdom,$cnum);
-
-	my ($checkForError)=keys(%classlist);
-	if($checkForError=~/^(con_lost|error|no_such_host)/i) {
-	    $r->print('<h1>Could not access course data</h1>');
-	} else {
-	    foreach my $name (sort keys (%classlist)) {
-		my $value=$classlist{$name};
-		my ($end,$start)=split(/\:/,$value);
-		my $active=1;
-		my $Status=$ENV{'form.status'};
-		$Status = ($Status) ? $Status : 'Active';
-		if ( ( ($end) && $now > $end ) && 
-		     ( ($Status eq 'Active') ) ) { $active=0; }
-		if ( ($Status eq 'Expired') && 
-		     ($end == 0 || $now < $end) ) { $active=0; }
-		if ($active) {
-		    my $thisindex=$#students+1;
-		    $students[$thisindex]=$name;
-		    my ($sname,$sdom)=split(/\:/,$name);
-		    my $ssec=&usection($sdom,$sname,$cid,$Status);
-		    if ($ssec==-1 || $ssec eq 'adm' ) {next;}
-		    $ssec=($ssec) ? $ssec : '(none)';
-		    #$ssec=(int($ssec)) ? int($ssec) : $ssec;
-		    $section{$ssec}=$ssec;
-		    if ($CurSec eq 'All Sections' || $ssec eq $CurSec) {
-			$students[$StudNo]=$name;
-			$StuBox{$sname}=$sdom;
-		    }
-		    $StudNo++;
-		}
-	    }
-	}
-
-        $r->print("Total number of students : ".($#students+1));
-        $r->rflush();
-# --------------- Find all assessments and put them into some linear-like order
-	&tracetable($firstres,'&'.$lastres.'&');
-#    my $c=0;
-#    foreach (sort keys %mapsort) {
-#	$r->print('<br>'.$c.')'.$_.' ... '.$mapsort{$_});
-#	$c++;
-#    }
-#	my $c=1;
-#	foreach (sort keys %OpResp) {
-#	    $r->print('<br>'.$c.')'.$_.' ... '.$OpResp{$_}.' ... '.$hash{'src_'.$OpResp{$_}});
-#	    $c++;
-#	}
-
-    }
-
-# ------------------------------------------------------------- End render page 
-    else {
-	$r->print('<h3>Undefined course sequence</h3>');
+        $r->print(&Apache::lonhtmlcommon::Title('LON-CAPA Statistics'));
+        $r->print('<form name="Statistics" ');
+        $r->print('method="post" action="/adm/statistics">');
+        $r->print(&CreateMainMenu($cache{'Status'}, \%reports));
+        untie(%cache);
+    } else {
+        $r->print('<html><body>Unable to tie database.</body></html>');
+        return OK;
     }
-}
-
-
-sub Title {
-    $r->print('<html><head><title>LON-CAPA Statistics</title></head>');
-    $r->print('<body bgcolor="#FFFFFF">'.
-              '<script>window.focus(); window.width=500;window.height=500;</script>'.
-              '<img align=right src=/adm/lonIcons/lonlogos.gif>');
-# ---------------------------------------------------------------- Course title
-    $r->print('<h1> Course : "'.
-              $ENV{'course.'.$ENV{'request.course.id'}.
-              '.description'}.'"</h1><h2>'.localtime().'</h2>');
-# ------------------------------- This is going to take a while, produce output
-    $r->rflush();	
-}
 
-
-sub CreateForm {
-    $r->print("\n".'<form name=stat method=post action="/adm/statistics" >');
-    my $content = $ENV{'form.sort'};
-    if (!($ENV{'form.showcsv'}) && 
-        ($content eq '' || $content eq 'Return to Menu')) {
-	my $Ptr = '<h3>';
-	$Ptr .= '<input type=submit name=sort value="Problem Stats"/>';
-	$Ptr .= '<br><br>';
-	$Ptr .= '<input type=submit name=sort value="Problem Analysis"/>';
-	$Ptr .= '<br><br>';
-	$Ptr .= '<input type=submit name=sort value="Student Assessment"/>';
-	$Ptr .= '</h3>';
-	#$Ptr .= '<input type=submit name=sort value="Activity Log"/>';
-	$r->print( $Ptr );
-    }
-    else {
-	&ClassList();
-	if ( $content eq 'Student Assessment' || 
-	     $content eq 'Create Student Report' ) {
-	    &MapSecOptions();
-	    &StudentOptions();
-	    &StudentReport($CurStu,$StuBox{"$CurStu"});
-	}
-	elsif ( $content eq 'Problem Analysis' ) {
-	    &AnalyzeProblem();
-	}
-	else {
-	    &MapSecOptions();
-	    &PreStatTable();
-	}
+    if($GoToPage eq 'Activity Log') {
+        &Apache::lonproblemstatistics::Activity();
+    } elsif($GoToPage eq 'Problem Statistics') {
+        $r->print(
+        &Apache::lonproblemstatistics::BuildProblemStatisticsPage($cacheDB, 
+                                                                  $students, 
+                                                                  $courseID, 
+                                                                  $c,$r));
+    } elsif($GoToPage eq 'Problem Analysis') {
+        $r->print(
+              &Apache::lonproblemanalysis::BuildProblemAnalysisPage($cacheDB));
+    } elsif($GoToPage eq 'Student Assessment') {
+        $r->print(
+            &Apache::lonstudentassessment::BuildStudentAssessmentPage($cacheDB,
+                                                            $students,
+                                                            $courseID,
+                                                            'Statistics',
+                                                            \@headings,
+                                                            $spacing,
+                                                            \@studentInformation,
+                                                            $r, $c));
+    } elsif($GoToPage eq 'Analyze') {
+        $r->print(&Apache::lonproblemanalysis::BuildAnalyzePage($cacheDB, 
+                                                                $students, 
+                                                                $courseID));
+    } elsif($GoToPage eq 'DoDiffGraph') {
+        &Apache::lonproblemstatistics::BuildDiffGraph($r);
+    } elsif($GoToPage eq 'PercentWrongGraph') {
+        &Apache::lonproblemstatistics::BuildWrongGraph($r);
+    } elsif($GoToPage eq 'Class list') {
+        $r->print(&BuildClasslist($cacheDB, $students, \@studentInformation,
+                                  \@headings));
     }
-}
 
-
-sub Menu {
-    &initial();
-#    my $fn=$ENV{'request.course.fn'};
-#    $r->print( '<br>'.$fn.'<br>' );
-
-#    $Apache::lonxml::debug=1;
-#    &Apache::lonhomework::showhash(%ENV);
-#    $Apache::lonxml::debug=0;
-
-    &Title();
-    my $InpStr = $ENV{'form.sort'};
-    if ($InpStr eq 'Activity Log') {
-	&Activity();
-    }    
-    elsif ($InpStr=~/^Analyze\_/) {
-	&ClassList();
-	&ShowOpGraph($InpStr,$ENV{'form.interval'});
-    }
-    elsif ( $InpStr eq 'DoDiff Graph' || $InpStr eq '%Wrong Graph' ) {      
-	&GetGraphData($InpStr);
-    	$r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" />');
-    }
-    else {
-	&CreateForm();
-	$r->print("\n".'</form>');
-    }
-    $r->print("\n".'</body>'.
-	      "\n".'</html>');
+    $r->print('</form>'."\n");
+    $r->print("\n".'</body>'."\n".'</html>');
     $r->rflush();
-}
-
-
-sub StudentOptions {
-    my $OpSel5='';
-    $CurStu = $ENV{'form.student'};
-    if ( $CurStu eq '' ) { 
-        $CurStu = 'All Students';
-        $OpSel5 = 'selected';
-    }
-    my $Ptr ='';
-# ----------------------------------- Loading the Students Combobox
-    $Ptr .= '<br><b>Select Student</b>'."\n".
-       	    '<select name="student">'."\n". 
-	    '<option '.$OpSel5.'>All Students</option>';                     	     	     
-    foreach my $key ( sort keys %StuBox ) {	          
-	$Ptr .= '<option';
-	if ($CurStu eq $key) {$Ptr .= ' selected';}     
-        $Ptr .= '>'.$key."</option>\n";	     
-    }
-    $Ptr .= '</select>';
-    $Ptr .= '<br><input type="submit" name="sort" value="Create Student Report" />';
-    $r->print( $Ptr );
-    $r->rflush();	
-}
-
-
-sub GetStatus {
-    $OpSel1='';
-    $OpSel2='';
-    $OpSel3='';
-    $OpSel4='';
-
-    if ( $ENV{'form.order'} eq 'Descending' ) { $OpSel2='selected'; }
-    else { $OpSel1 = 'selected'; }
-
-    my %myHeader = reverse( %Header );
-    $Pos = $myHeader{$ENV{'form.sort'}};
-    if ($Pos == 0) {
-	$OpSel1 = 'selected';
-	$ENV{'form.order'}='Ascendig';
-    }
-
-    $CurMap = $ENV{'form.maps'};
-    if ( $CurMap eq '' ) { 
-	$CurMap = 'All Maps';
-	$OpSel3 = 'selected';
-    }
-    $CurSec = $ENV{'form.section'};
-    if ( $CurSec eq '' ) { 
-	$CurSec = 'All Sections';
-        $OpSel4 = 'selected';
-    }
-}
-
-
-sub MapSecOptions {
-# ----------------------------------- Loading the Maps Combobox
-    my $Ptr = '<br>';
-    $Ptr .= '<input type="submit" name="sort" value="Return to Menu" />';
-    $Ptr .= '<br><b> Select &nbsp; Map &nbsp; &nbsp; </b>'."\n".
-       	    '<select name="maps">'."\n". 
-	    '<option '.$OpSel3.'>All Maps</option>';                     	     	     
-    foreach my $key ( sort keys %maps ) {	          
-	$Ptr .= '<option';
-        if ($CurMap eq $key) {$Ptr .= ' selected';}	     
-	$Ptr .= '>'.$key."</option>\n";	     
-    }
-    $Ptr .= '</select>';
-    $Ptr .= '&nbsp;&nbsp;&nbsp;';
-
-# ----------------------------------- Loading the Sections Combobox
-    $Ptr .= '<br><b>Select Section</b>'."\n".
-       	    '<select name="section">'."\n". 
-	    '<option '.$OpSel4.'>All Sections</option>';                     	     	     
-    foreach my $key ( sort keys %section ) {	          
-	$Ptr .= '<option';
-        if ($CurSec eq $key) {$Ptr .= ' selected';}     
-	$Ptr .= '>'.$key."</option>"."\n";	     
-    }
-    $Ptr .= '</select>'."\n";
 
-    $r->print( $Ptr );
-    $r->rflush();
+    return OK;
 }
 
-
 # ================================================================ Main Handler
 
 sub handler {
-    $r=shift;
-
-    if (&Apache::lonnet::allowed('vgr',$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
+    my $r=shift;
 
-	undef %hash;
+#    $jr = $r;
 
-	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
-		    $r->content_type('text/html');
-		    $r->send_http_header;
-		    &Menu();
-		}
-		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 {
+    unless(&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
         $ENV{'user.error.msg'}=
         $r->uri.":vgr:0:0:Cannot view grades for complete course";
+        return HTTP_NOT_ACCEPTABLE; 
+    }
 
+    # Set document type for header only
+    if($r->header_only) {
+        if ($ENV{'browser.mathml'}) {
+            $r->content_type('text/xml');
+        } else {
+            $r->content_type('text/html');
+        }
+        &Apache::loncommon::no_cache($r);
+        $r->send_http_header;
+        return OK;
+    }
+
+    unless($ENV{'request.course.fn'}) {
+	my $requrl=$r->uri;
+        $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
         return HTTP_NOT_ACCEPTABLE; 
     }
+
+    $r->content_type('text/html');
+    $r->send_http_header;
+
+    &BuildStatistics($r);
+
+    return OK;
 }
 1;
 __END__
+