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Now problem statistics will display its problems in tables based on its
sequence with a sequence title.  It can also display the problems all
together, based on the new button Sort All Problems/Sort Within Sequence.
This button also allows the user to sort within the sequence or sort
all the problems as one group.

The second thing is that now problem statistics uses an initialization
function as does the chart from its page.  This allows the data
to be updated (like a change in status) to be seen while still in chart
mode instead of having to go back to problem statistics main page to
get the statistics data updated.

# The LearningOnline Network with CAPA
# (Publication Handler
#
# $Id: lonstatistics.pm,v 1.45 2002/08/14 17:45:19 stredwic Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# (Navigate problems for statistical reports
# YEAR=2001
# 5/5,7/9,7/25/1,8/11,9/13,9/26,10/5,10/9,10/22,10/26 Behrouz Minaei
# 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
# 5/12,5/14,5/15,5/19,5/26,7/16,25/7,29/7  Behrouz Minaei
#
###

package Apache::lonstatistics; 

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 HTML::TokeParser;
use GDBM_File;


sub CheckFormElement {
    my ($cache, $ENVName, $cacheName, $default)=@_;

    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($ENV{'QUERY_STRING'},
                                            ['sort','download',
                                             'reportSelected',
                                             'StudentAssessmentStudent',
                                             'ProblemStatisticsSort']);
    &CheckFormElement($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($cache, 'download', 'download', 'false');
    &CheckFormElement($cache, 'StatisticsMaps', 
                      'StatisticsMaps', 'All Maps');
    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'};
    }

    # student assessment
    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');

    # Problem analysis
    &CheckFormElement($cache, 'Interval', 'Interval', '1');

    # ProblemStatistcs
    &CheckFormElement($cache, 'DisplayCSVFormat',
                      'DisplayFormat', 'Display Table Format');
    &CheckFormElement($cache, 'ProblemStatisticsAscend',
                      'ProblemStatisticsAscend', 'Ascending');
    &CheckFormElement($cache, 'ProblemStatisticsSort',
                      'ProblemStatisticsSort', 'Homework Sets Order');
    &CheckFormElement($cache, 'DisplayLegend', 'DisplayLegend', 'Hide Legend');
    &CheckFormElement($cache, 'SortProblems', 'SortProblems', 
                      'Sort Within Sequence');

    # Search only form elements
    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;
            }
        }
    }

    $cache->{'reportKey'} = 'false';
    if($cache->{'reportSelected'} eq 'Analyze') {
        $cache->{'reportKey'} = 'Analyze';
    } elsif($cache->{'reportSelected'} eq 'DoDiffGraph') {
        $cache->{'reportKey'} = 'DoDiffGraph';
    } elsif($cache->{'reportSelected'} eq 'PercentWrongGraph') {
        $cache->{'reportKey'} = 'PercentWrongGraph';
    }

    if(defined($ENV{'form.DoDiffGraph'})) {
        $cache->{'reportSelected'} = 'DoDiffGraph';
        $cache->{'reportKey'} = 'DoDiffGraph';
    } elsif(defined($ENV{'form.PercentWrongGraph'})) {
        $cache->{'reportSelected'} = 'PercentWrongGraph';
        $cache->{'reportKey'} = 'PercentWrongGraph';
    }

    foreach (keys(%ENV)) {
        if(/form\.Analyze/) {
            $cache->{'reportSelected'} = 'Analyze';
            $cache->{'reportKey'} = 'Analyze';
            my $data;
            (undef, $data)=split(':::', $_);
            $cache->{'AnalyzeInfo'}=$data;
        } 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;
        }
    }

    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;
}

=pod

=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.

=over 4

Input: $students, $CacheData

$students: A array pointer to a list of students (username:domain)

$CacheData: A pointer to the hash tied to the cached data

Output: \@order

@order: An ordered list of students (username:domain)

=back

=cut

sub SortStudents {
    my ($cache)=@_;

    my @students = split(':::',$cache->{'NamesOfStudents'});
    my @sorted1Students=();
    foreach (@students) {
        if($cache->{'Status'} eq 'Any' || 
           $cache->{$_.':Status'} eq $cache->{'Status'}) {
            push(@sorted1Students, $_);
        }
    }

    my $sortBy = '';
    if(defined($cache->{'sort'})) {
        $sortBy = ':'.$cache->{'sort'};
    }
    my @order = sort { $cache->{$a.$sortBy} cmp $cache->{$b.$sortBy} ||
                       $cache->{$a.':fullname'} cmp $cache->{$b.':fullname'} } 
                @sorted1Students;

    return \@order;
}

=pod

=item &SpaceColumns()

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.

=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.

$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;
            }
        }
    }

    return;
}

sub PrepareData {
    my ($c, $cacheDB, $studentInformation, $headings,$r)=@_;

    # Test for access to the cache data
    my $courseID=$ENV{'request.course.id'};
    my $isRecalculate=0;
    if(defined($ENV{'form.Recalculate'})) {
        $isRecalculate=1;
    }

    my $isCached = &Apache::loncoursedata::TestCacheData($cacheDB, 
                                                         $isRecalculate);
    if($isCached < 0) {
        return "Unable to tie hash to db file.";
    }

    # 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, $r);
        if($processTopResourceMapReturn ne 'OK') {
            untie(%cache);
            return $processTopResourceMapReturn;
        }
    }

    if($c->aborted()) {
        untie(%cache);
        return 'aborted'; 
    }

    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.";
        }
    }

    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'});
        $cache{'download'} = 'false';
        if(&Apache::loncoursedata::DownloadStudentCourseData(\@who, 'false', 
                                                             $cacheDB, 'true', 
                                                             'false', $courseID,
                                                             $r, $c) ne 'OK') {
            untie(%cache);
            return 'Stop at download individual';
        }
    } elsif($cache{'DownloadAll'} ne 'false') {
        $cache{'DownloadAll'} = 'false';
        my @allStudents;
        if($cache{'DownloadAll'} eq 'sorted') {
            @allStudents = @$students;
        } else {
            @allStudents = split(':::', $cache{'NamesOfStudents'});
        }
        if(&Apache::loncoursedata::DownloadStudentCourseData(\@allStudents, 
                                                             'false', 
                                                             $cacheDB, 'true', 
                                                             'true', $courseID,
                                                             $r, $c) ne 'OK') {
            untie(%cache);
            return 'Stop at download all';
        }
    }

    if($c->aborted()) {
        untie(%cache);
        return 'aborted'; 
    }

    untie(%cache);

    return ('OK', $students);
}

sub BuildClasslist {
    my ($cacheDB,$students,$studentInformation,$headings,$r)=@_;

    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';
            }

            $Str .= '</td>'."\n";
        }
    }

    $Str .= '</tr>'."\n";
    $Str .= '</table></td></tr></table>'."\n";
    $r->print($Str);
    $r->rflush();

    untie(%cache);

    return;
}

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";

    $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',
#                   'activitylog'        => 'Activity Log',
                   '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";

    $r->print(&Apache::lonhtmlcommon::Title('LON-CAPA Statistics'));

    my ($returnValue, $students) = &PrepareData($c, $cacheDB, 
                                                \@studentInformation, 
                                                \@headings,$r);
    if($returnValue ne 'OK') {
        $r->print($returnValue."\n".'</body></html>');
        return OK;
    }
    if(!$c->aborted()) {
        &Apache::loncoursedata::CheckForResidualDownload($cacheDB, 
                                                         'true', 'true',
                                                         $courseID,
                                                         $r, $c);
    }

    my $GoToPage;
    if(tie(%cache,'GDBM_File',$cacheDB,&GDBM_READER(),0640)) {
        $GoToPage = $cache{'reportSelected'};
        $reports{'reportSelected'} = $cache{'reportSelected'};
        if(defined($cache{'reportKey'}) && 
           !exists($reports{$cache{'reportKey'}}) && 
           $cache{'reportKey'} ne 'false') {
            $reports{$cache{'reportKey'}} = $cache{'reportSelected'};
        }

        if(defined($cache{'OptionResponses'})) {
            $reports{'problem_analysis'} = 'Problem Analysis';
        }

        $r->print('<form name="Statistics" ');
        $r->print('method="post" action="/adm/statistics">');
        $r->print(&CreateMainMenu($cache{'Status'}, \%reports));
        $r->rflush();
        untie(%cache);
    } else {
        $r->print('<html><body>Unable to tie database.</body></html>');
        return OK;
    }

    if($GoToPage eq 'Activity Log') {
        &Apache::lonproblemstatistics::Activity();
    } elsif($GoToPage eq 'Problem Statistics') {
        &Apache::lonproblemstatistics::BuildProblemStatisticsPage($cacheDB, 
                                                                  $students, 
                                                                  $courseID, 
                                                                  $c,$r);
    } elsif($GoToPage eq 'Problem Analysis') {
        &Apache::lonproblemanalysis::BuildProblemAnalysisPage($cacheDB, $r);
    } elsif($GoToPage eq 'Student Assessment') {
        &Apache::lonstudentassessment::BuildStudentAssessmentPage($cacheDB,
                                                          $students,
                                                          $courseID,
                                                          'Statistics',
                                                          \@headings,
                                                          $spacing,
                                                          \@studentInformation,
                                                          $r, $c);
    } elsif($GoToPage eq 'Analyze') {
        &Apache::lonproblemanalysis::BuildAnalyzePage($cacheDB, $students, 
                                                      $courseID, $r);
    } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
        my $courseDescription = $ENV{'course.'.$courseID.'.description'};
        $courseDescription =~ s/\ /"_"/eg;
        &Apache::lonproblemstatistics::BuildGraphicChart($GoToPage, $cacheDB,
                                                         $courseDescription,
                                                         $students, $courseID,
                                                         $r, $c);
    } elsif($GoToPage eq 'Class list') {
        &BuildClasslist($cacheDB, $students, \@studentInformation,
                        \@headings, $r);
    }

    $r->print('</form>'."\n");
    $r->print("\n".'</body>'."\n".'</html>');
    $r->rflush();

    return OK;
}

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

sub handler {
    my $r=shift;

#    $jr = $r;

    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__