# The LearningOnline Network with CAPA
#
# $Id: lonstudentsubmissions.pm,v 1.15 2004/09/01 21:13:04 matthew 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/
#
package Apache::lonstudentsubmissions;

use strict;
use Apache::lonnet();
use Apache::loncommon();
use Apache::lonhtmlcommon();
use Apache::loncoursedata();
use Apache::lonstatistics;
use Apache::lonlocal;
use Apache::lonstathelpers;
use HTML::Entities();
use Time::Local();
use Spreadsheet::WriteExcel();

my @SubmitButtons = ({ name => 'PrevProblem',
                       text => 'Previous Problem' },
                     { name => 'NextProblem',
                       text => 'Next Problem' },
                     { name => 'break'},
                     { name => 'SelectAnother',
                       text => 'Choose a different Problem' },
                     { name => 'Generate',
                       text => 'Generate Spreadsheet'},
                     );

sub BuildStudentSubmissionsPage {
    my ($r,$c)=@_;
    #
    my %Saveable_Parameters = ('Status' => 'scalar',
                               'Section' => 'array',
                               'NumPlots' => 'scalar',
                               );
    &Apache::loncommon::store_course_settings('student_submissions',
                                              \%Saveable_Parameters);
    &Apache::loncommon::restore_course_settings('student_submissions',
                                                \%Saveable_Parameters);
    #
    &Apache::lonstatistics::PrepareClasslist();
    #
    $r->print(&CreateInterface());
    #
    my @Students = @Apache::lonstatistics::Students;
    #
    if (@Students < 1) {
        $r->print('<h2>There are no students in the sections selected</h2>');
    }
    #
    my @CacheButtonHTML = 
        &Apache::lonstathelpers::manage_caches($r,'Statistics','stats_status');
    $r->rflush();
    #
    if (exists($ENV{'form.problemchoice'}) && 
        ! exists($ENV{'form.SelectAnother'})) {
        foreach my $button (@SubmitButtons) {
            if ($button->{'name'} eq 'break') {
                $r->print("<br />\n");
            } else {
                $r->print('<input type="submit" name="'.$button->{'name'}.'" '.
                          'value="'.&mt($button->{'text'}).'" />');
                $r->print('&nbsp;'x5);
            }
        }
        foreach my $html (@CacheButtonHTML) {
            $r->print($html.('&nbsp;'x5));
        }
        #
        $r->print('<hr />');
        $r->rflush();
        #
        # Determine which problem we are to analyze
        my $current_problem = &Apache::lonstathelpers::get_target_from_id
            ($ENV{'form.problemchoice'});
        #
        my ($prev,$curr,$next) = 
            &Apache::lonstathelpers::get_prev_curr_next($current_problem,
                                                        '.',
                                                        'response',
                                                        );
        if (exists($ENV{'form.PrevProblem'}) && defined($prev)) {
            $current_problem = $prev;
        } elsif (exists($ENV{'form.NextProblem'}) && defined($next)) {
            $current_problem = $next;
        } else {
            $current_problem = $curr;
        }
        #
        # Store the current problem choice and send it out in the form
        $ENV{'form.problemchoice'} = 
            &Apache::lonstathelpers::make_target_id($current_problem);
        $r->print('<input type="hidden" name="problemchoice" value="'.
                  $ENV{'form.problemchoice'}.'" />');
        #
        if (! defined($current_problem->{'resource'})) {
            $r->print('resource is undefined');
        } else {
            my $resource = $current_problem->{'resource'};
            $r->print('<h1>'.$resource->{'title'}.'</h1>');
            $r->print('<h3>'.$resource->{'src'}.'</h3>');
            if ($ENV{'form.renderprob'} eq 'true') {
                $r->print(&Apache::lonstathelpers::render_resource($resource));
            }
            $r->rflush();
            my %Data = &Apache::lonstathelpers::get_problem_data
                ($resource->{'src'});
            my $ProblemData = $Data{$current_problem->{'part'}.
                                    '.'.
                                    $current_problem->{'respid'}};
            &prepare_html_output($r,$current_problem,
                                  $ProblemData,\@Students);
#            &prepare_excel_output($r,$current_problem,
#                                  $ProblemData,\@Students);
        }
        $r->print('<hr />');
    } else {
        $r->print('<input type="submit" name="Generate" value="'.
                  &mt('Generate Spreadsheet').'" />');
        $r->print('&nbsp;'x5);
        $r->print('<h3>'.&mt('Please select a problem to analyze').'</h3>');
        $r->print(&Apache::lonstathelpers::ProblemSelector('.'));
    }
}

#########################################################
#########################################################
##
##    prepare_html_output
##
#########################################################
#########################################################
sub prepare_html_output {
    my ($r,$problem,$ProblemData,$Students) = @_;
    my $c = $r->connection();
    my ($resource,$respid,$partid) = ($problem->{'resource'},
                                      $problem->{'respid'},
                                      $problem->{'part'});
    $r->print('<h2>'.&mt('Student Responses').'</h2>');
    #
    if ($ENV{'form.correctans'} eq 'true') {
        &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$Students,
                                                   'Statistics',
                                                   'stats_status');
    }
    #
    $r->rflush();
    my $response_type;
    for (my $i=0;
         $i<scalar(@{$resource->{'partdata'}->{$partid}->{'ResponseIds'}});
         $i++) {
        if($resource->{'partdata'}->{$partid}->{'ResponseIds'}->[$i] eq $respid){
            $response_type = 
                $resource->{'partdata'}->{$partid}->{'ResponseTypes'}->[$i];
            last;
        }
    }
    if (! defined($response_type)) {
        $r->print('<h2>'.&mt('Unable to determine response type').'</h2>');
    } else {
        my $count = 0;
        my $header;
        if ($response_type eq 'essay') {
            $header = &html_essay_header();
        } elsif ($response_type eq 'radiobutton') {
            $header = &html_radiobutton_header();
        } elsif ($response_type eq 'option') {
            $header = &html_option_header();
        } else {
            $header = &html_generic_header();
        }
        $header = '<tr>'.$header.'</tr>';
        #
        $r->print($/.'<table>'.$/.$header.$/);
        foreach my $student (@$Students) {
            if ($count >= 50) {
                $r->print('</table>'.$/.'<table>'.$/.$header.$/);
                $count = 0;
            }
            last if ($c->aborted());
            my $results = &Apache::loncoursedata::get_response_data_by_student
                ($student,$resource->{'symb'},$respid);
            next if (! defined($results) || ref($results) ne 'ARRAY');
            for (my $i=0;$i<scalar(@$results);$i++) {
                my $response = $results->[$i];
                if ($ENV{'form.last_sub_only'} eq 'true' && 
                    $i < (scalar(@$results)-1)) {
                    next;
                }
                my $data;
                $data->{'sname'} = $student->{'username'}.'@'.
                    $student->{'domain'};
                $data->{'time'} = &Apache::lonlocal::locallocaltime
                    ($response->[&Apache::loncoursedata::RDs_timestamp()]);
                $data->{'attempt'} = 
                    $response->[&Apache::loncoursedata::RDs_tries()];
                $data->{'submission'} = 
                    $response->[&Apache::loncoursedata::RDs_submission()];
                $data->{'correct'} = $student->{'answer'};
                my $row;
                if ($response_type eq 'essay') {
                    $row = &html_essay($data);
                } elsif ($response_type eq 'radiobutton') {
                    $row = &html_radiobutton($data);
                } elsif ($response_type eq 'option') {
                    $row = &html_option($data);
                } else {
                    $row = &html_generic($data);
                }
                $r->print($row.$/);
                $count++;
            }
        }
        $r->print('</table>'.$/);
    }
    return;
}

#####################################################
##
##     HTML helper routines
##
#####################################################
my @FullHeaders = (
                   {name=>'sname',
                    display=>'Student'},
                   {name => 'id',
                    display => 'Id'},
                   {name => 'time',
                    display =>'Time'},
                   {name => 'attempt',
                    display =>'Attempt'},
                   {name => 'grading',
                    display =>'Grading'},
                   );

sub html_essay_header {
    my $header;
    if ($ENV{'form.subdata'} eq 'true') {
        foreach (@FullHeaders) {
            $header .= '<th>'.&mt($_->{'display'}).'</th>';
        }
    } else {
        $header = '<th>'.&mt('Username and Submission').'</th>';
    }
    return $header;
}

sub html_essay {
    my ($data)=@_;
    #
    $data->{'submission'} =~ s|\\r\\n|$/|g;
    $data->{'submission'} = 
        &HTML::Entities::encode($data->{'submission'},'<>&"');
    $data->{'submission'} =~ s|$/\s*$/|$/</p><p>$/|g;
    $data->{'submission'} =~ s|\\||g;
    $data->{'submission'} = '<p>'.$data->{'submission'}.'</p>';
    #
    my $Str  = '<tr>';
    if ($ENV{'form.subdata'} eq 'true') {
        $Str .= 
            '<td><b>'.$data->{'sname'}.'</b></td>'.
            '<td>'.$data->{'time'}.'</td>'.
            '<td>'.$data->{'attempt'}.'</td>';
        $Str .= '</tr>';
        $Str .= '<tr><td colspan="'.scalar(@FullHeaders).'">'.
            $data->{'submission'}.'</td>';
    } else {
        $Str .= '<td><b>'.$data->{'sname'}.'</b>'.
            $data->{'submission'}.'</td>';
    }
    if ($ENV{'form.correctans'} eq 'true') {
        $Str .= '</tr>';
        if (defined($data->{'correct'}) && $data->{'correct'} !~ /^\s*$/) {
            $Str .= '<tr><td colspan="'.scalar(@FullHeaders).'">'.
                '<b>'.&mt('Correct Answer:').'</b>'.$data->{'correct'}.'</td>';
        }
    }
    $Str .= '</tr>';
    #
    return $Str;
}

sub html_radiobutton_header {
    my $header;
    if ($ENV{'form.subdata'} eq 'true') {
        foreach (@FullHeaders) {
            $header .= '<th>'.&mt($_->{'display'}).'</th>';
        }
    } else {
        $header = 
            '<th>'.&mt('Username').'</th>';
    }
    $header .='<th>'.&mt('Submission').'</th>';
    if ($ENV{'form.correctans'} eq 'true') {
        $header .= '<th>'.&mt('Correct').'</th>';
    }
    return $header;
}

sub html_radiobutton {
    my ($data)=@_;
    #
    $data->{'submission'} =~ s/=([^=])$//;
    #
    my $Str  = '<tr>';
    if ($ENV{'form.subdata'} eq 'true') {
        $Str .= 
            '<td>'.'<b>'.$data->{'sname'}.'</b></td>'.
            '<td>'.$data->{'time'}.'</td>'.
            '<td>'.$data->{'attempt'}.'</td>';
        $Str .= '<td>'.$data->{'submission'}.'</td>';
        if ($ENV{'form.correctans'} eq 'true') {
            $Str .= '<td>'.$data->{'correct'}.'</td>';
        }
    } else {
        $Str .= '<td><b>'.$data->{'sname'}.'</b></td>';
        $Str .= '<td>'.$data->{'submission'}.'</td>';
        if ($ENV{'form.correctans'} eq 'true') {
            $Str .= '<td>'.$data->{'correct'}.'</td>';
        }
    }
    $Str .= '</tr>';
    #
    return $Str;
}

sub html_generic_header {
    my $header;
    if ($ENV{'form.subdata'} eq 'true') {
        foreach (@FullHeaders) {
            $header .= '<th>'.&mt($_->{'display'}).'</th>';
        }
    } else {
        $header = 
            '<th>'.&mt('Username').'</th>';
    } 
    $header .= '<th>'.&mt('Submission').'</th>';
    if ($ENV{'form.correctans'} eq 'true') {
        $header .= '<th>'.&mt('Correct').'</th>';
    }
    return $header;
}

sub html_generic {
    my ($data)=@_;
    $data->{'submission'} = &Apache::lonnet::unescape($data->{'submission'});
    my $Str  = '<tr>';
    if ($ENV{'form.subdata'} eq 'true') {
        $Str .= 
            '<td><b>'.$data->{'sname'}.'</b></td>'.
            '<td>'.$data->{'time'}.'</td>'.
            '<td>'.$data->{'attempt'}.'</td>';
    } else {
        $Str .= '<td><b>'.$data->{'sname'}.'</b></td>';
    }
    $Str .= '<td>'.$data->{'submission'}.'</td>';
    if ($ENV{'form.correctans'} eq 'true') {
        $Str .= '<td>'.$data->{'correct'}.'</td>';
    }
    $Str .= '</tr>';
    return $Str;
}

sub html_option_header {
    my $header;
    if ($ENV{'form.subdata'} eq 'true') {
        foreach (@FullHeaders) {
            $header .= '<th>'.&mt($_->{'display'}).'</th>';
        }
    } else {
        $header = 
            '<th>'.&mt('Username').'</th>';
    } 
    $header .= '<th>'.&mt('Submission').'</th>';
    if ($ENV{'form.correctans'} eq 'true') {
        $header .= '<th>'.&mt('Correct').'</th>';
    }
    return $header;
}

sub html_option {
    my ($data)=@_;
    $data->{'submission'} = '<ul class="studentans">'.
        '<li>'.join('</li><li>',
                    map { 
                        &Apache::lonnet::unescape($_) ;
                    } sort split('&',$data->{'submission'})).
                        '</li><ul>';
    $data->{'correct'} = '<ul class="correctans">'.
        '<li>'.join('</li><li>',
                    map { 
                        &Apache::lonnet::unescape($_) ;
                    } sort split('&',$data->{'correct'})).'</li></ul>';
    my $Str  = '<tr>';
    if ($ENV{'form.subdata'} eq 'true') {
        $Str .= 
            '<td><b>'.$data->{'sname'}.'</b></td>'.
            '<td>'.$data->{'time'}.'</td>'.
            '<td>'.$data->{'attempt'}.'</td>';
    } else {
        $Str .= '<td><b>'.$data->{'sname'}.'</b></td>';
    }
    $Str .= '<td>'.$data->{'submission'}.'</td>';
    if ($ENV{'form.correctans'} eq 'true') {
        $Str .= '<td>'.$data->{'correct'}.'</td>';
    }
    $Str .= '</tr>';
    return $Str;
}


=pod

    my @Columns;
    push(@Columns,'username');
    push(@Columns,'domain');
    push(@Columns,'attempt');
    push(@Columns,'time');
    push(@Columns,'submission');
    if ($ENV{'form.correctans'} eq 'true') { push(@Columns,'correct'); }
    push(@Columns,'grading');
    push(@Columns,'awarded');
    my $awarded_col = $#Columns;
    push(@Columns,'weight');
    my $weight_col  = $#Columns;
    push(@Columns,'score');
    #
    # Create excel worksheet
    my $filename = '/prtspool/'.
        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
        time.'_'.rand(1000000000).'.xls';
    my $workbook  = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
    if (! defined($workbook)) {
        $r->log_error("Error creating excel spreadsheet $filename: $!");
        $r->print('<p>'.&mt("Unable to create new Excel file.  ".
                            "This error has been logged.  ".
                            "Please alert your LON-CAPA administrator").
                  '</p>');
        return undef;
    }
    #
    $workbook->set_tempdir('/home/httpd/perl/tmp');
    #
    my $format = &Apache::loncommon::define_excel_formats($workbook);
    my $worksheet  = $workbook->addworksheet('Student Submission Data');
    #
    # Make sure we get new weight data instead of data on a 10 minute delay
    &Apache::lonnet::clear_EXT_cache_status();
    #
    # Put on the standard headers and whatnot
    my $rows_output=0;
    $worksheet->write($rows_output++,0,$resource->{'title'},$format->{'h1'});
    $worksheet->write($rows_output++,0,$resource->{'src'},$format->{'h3'});
    $rows_output++;
    $worksheet->write_row($rows_output++,0,\@Columns,$format->{'bold'});
    #
    # Populate the worksheet with the student data
    foreach my $student (@$Students) {
        last if ($c->aborted());
        my $results = &Apache::loncoursedata::get_response_data_by_student
            ($student,$resource->{'symb'},$respid);
        my %row;
        $row{'username'} = $student->{'username'};
        $row{'domain'}   = $student->{'domain'};
        $row{'correct'}  = $student->{'answer'};
        $row{'weight'} = &Apache::lonnet::EXT
            ('resource.'.$partid.'.weight',$resource->{'symb'},
             undef,undef,undef);
        if (! defined($results) || ref($results) ne 'ARRAY') {
            $row{'score'} = '='.
                &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                    ($rows_output,$awarded_col)
                .'*'.
                &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                    ($rows_output,$weight_col);
            my $cols_output = 0;
            foreach my $col (@Columns) {
                if (! exists($row{$col})) {
                    $cols_output++;
                    next;
                }
                $worksheet->write($rows_output,$cols_output++,$row{$col});
            }
            $rows_output++;
        } else {
            for (my $i=0;$i<scalar(@$results);$i++) {
                my $response = $results->[$i];
                if ($ENV{'form.last_sub_only'} eq 'true' && 
                    $i < (scalar(@$results)-1)) {
                    next;
                }
                delete($row{'time'});
                delete($row{'attempt'});
                delete($row{'submission'});
                delete($row{'awarded'});
                delete($row{'grading'});
                delete($row{'score'});
                my %row_format;
                #
                # Time is handled differently
                $row{'time'} = &Apache::lonstathelpers::calc_serial
                    ($response->[&Apache::loncoursedata::RDs_timestamp()]);
                $row_format{'time'}=$format->{'date'};
                #
                $row{'attempt'}  = $response->[
                     &Apache::loncoursedata::RDs_tries()];
                $row{'submission'} = $response->[
                     &Apache::loncoursedata::RDs_submission()];
                if ($row{'submission'} =~ m/^=/) {
                    # This will be interpreted as a formula.  That is bad!
                    $row{'submission'} = " ".$row{'submission'};
                }
                $row{'grading'} = $response->[
                     &Apache::loncoursedata::RDs_awarddetail()];
                $row{'awarded'} = $response->[
                     &Apache::loncoursedata::RDs_awarded()];
                $row{'score'} = '='.
                    &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                        ($rows_output,$awarded_col)
                    .'*'.
                    &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                        ($rows_output,$weight_col);
                my $cols_output = 0;
                foreach my $col (@Columns) {
                    $worksheet->write($rows_output,$cols_output++,$row{$col},
                                      $row_format{$col});
                }
                $rows_output++;
            }
        } # End of else clause on if (! defined($results) ....
    }
    #
    # Close the excel file
    $workbook->close();
    #
    # Write a link to allow them to download it
    $r->print('<p><a href="'.$filename.'">'.
              &mt('Your Excel spreadsheet.').
              '</a></p>'."\n");
    $r->print('<script>'.
              'window.document.Statistics.stats_status.value="'.
              'Done compiling spreadsheet.  See link below to download.'.
              '";</script>');
    $r->rflush();
    return;
    
}

=cut

#########################################################
#########################################################
##
##      Excel output of student answers and correct answers
##
#########################################################
#########################################################
sub prepare_excel_output {
    my ($r,$problem,$ProblemData,$Students) = @_;
    my $c = $r->connection();
    my ($resource,$respid,$partid) = ($problem->{'resource'},
                                      $problem->{'respid'},
                                      $problem->{'part'});
    $r->print('<h2>'.
              &mt('Preparing Excel spreadsheet of student responses').
              '</h2>'.
              '<p>'.
              &mt('See the status bar above for student answer computation progress').
              '</p>');
    #
    if ($ENV{'form.correctans'} eq 'true') {
        &Apache::lonstathelpers::GetStudentAnswers($r,$problem,$Students,
                                                   'Statistics',
                                                   'stats_status');
    }
    #
    $r->print('<script>'.
              'window.document.Statistics.stats_status.value="'.
              'Done computing student answers.  Compiling spreadsheet.'.
              '";</script>');
    $r->rflush();
    my @Columns;
    push(@Columns,'username');
    push(@Columns,'domain');
    push(@Columns,'attempt');
    push(@Columns,'time');
    push(@Columns,'submission');
    if ($ENV{'form.correctans'} eq 'true') { push(@Columns,'correct'); }
    push(@Columns,'grading');
    push(@Columns,'awarded');
    my $awarded_col = $#Columns;
    push(@Columns,'weight');
    my $weight_col  = $#Columns;
    push(@Columns,'score');
    #
    # Create excel worksheet
    my $filename = '/prtspool/'.
        $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
        time.'_'.rand(1000000000).'.xls';
    my $workbook  = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
    if (! defined($workbook)) {
        $r->log_error("Error creating excel spreadsheet $filename: $!");
        $r->print('<p>'.&mt("Unable to create new Excel file.  ".
                            "This error has been logged.  ".
                            "Please alert your LON-CAPA administrator").
                  '</p>');
        return undef;
    }
    #
    $workbook->set_tempdir('/home/httpd/perl/tmp');
    #
    my $format = &Apache::loncommon::define_excel_formats($workbook);
    my $worksheet  = $workbook->addworksheet('Student Submission Data');
    #
    # Make sure we get new weight data instead of data on a 10 minute delay
    &Apache::lonnet::clear_EXT_cache_status();
    #
    # Put on the standard headers and whatnot
    my $rows_output=0;
    $worksheet->write($rows_output++,0,$resource->{'title'},$format->{'h1'});
    $worksheet->write($rows_output++,0,$resource->{'src'},$format->{'h3'});
    $rows_output++;
    $worksheet->write_row($rows_output++,0,\@Columns,$format->{'bold'});
    #
    # Populate the worksheet with the student data
    foreach my $student (@$Students) {
        last if ($c->aborted());
        my $results = &Apache::loncoursedata::get_response_data_by_student
            ($student,$resource->{'symb'},$respid);
        my %row;
        $row{'username'} = $student->{'username'};
        $row{'domain'}   = $student->{'domain'};
        $row{'correct'}  = $student->{'answer'};
        $row{'weight'} = &Apache::lonnet::EXT
            ('resource.'.$partid.'.weight',$resource->{'symb'},
             undef,undef,undef);
        if (! defined($results) || ref($results) ne 'ARRAY') {
            $row{'score'} = '='.
                &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                    ($rows_output,$awarded_col)
                .'*'.
                &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                    ($rows_output,$weight_col);
            my $cols_output = 0;
            foreach my $col (@Columns) {
                if (! exists($row{$col})) {
                    $cols_output++;
                    next;
                }
                $worksheet->write($rows_output,$cols_output++,$row{$col});
            }
            $rows_output++;
        } else {
            for (my $i=0;$i<scalar(@$results);$i++) {
                my $response = $results->[$i];
                if ($ENV{'form.last_sub_only'} eq 'true' && 
                    $i < (scalar(@$results)-1)) {
                    next;
                }
                delete($row{'time'});
                delete($row{'attempt'});
                delete($row{'submission'});
                delete($row{'awarded'});
                delete($row{'grading'});
                delete($row{'score'});
                my %row_format;
                #
                # Time is handled differently
                $row{'time'} = &Apache::lonstathelpers::calc_serial
                    ($response->[&Apache::loncoursedata::RDs_timestamp()]);
                $row_format{'time'}=$format->{'date'};
                #
                $row{'attempt'}  = $response->[
                     &Apache::loncoursedata::RDs_tries()];
                $row{'submission'} = $response->[
                     &Apache::loncoursedata::RDs_submission()];
                if ($row{'submission'} =~ m/^=/) {
                    # This will be interpreted as a formula.  That is bad!
                    $row{'submission'} = " ".$row{'submission'};
                }
                $row{'grading'} = $response->[
                     &Apache::loncoursedata::RDs_awarddetail()];
                $row{'awarded'} = $response->[
                     &Apache::loncoursedata::RDs_awarded()];
                $row{'score'} = '='.
                    &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                        ($rows_output,$awarded_col)
                    .'*'.
                    &Spreadsheet::WriteExcel::Utility::xl_rowcol_to_cell
                        ($rows_output,$weight_col);
                my $cols_output = 0;
                foreach my $col (@Columns) {
                    $worksheet->write($rows_output,$cols_output++,$row{$col},
                                      $row_format{$col});
                }
                $rows_output++;
            }
        } # End of else clause on if (! defined($results) ....
    }
    #
    # Close the excel file
    $workbook->close();
    #
    # Write a link to allow them to download it
    $r->print('<p><a href="'.$filename.'">'.
              &mt('Your Excel spreadsheet.').
              '</a></p>'."\n");
    $r->print('<script>'.
              'window.document.Statistics.stats_status.value="'.
              'Done compiling spreadsheet.  See link below to download.'.
              '";</script>');
    $r->rflush();
    return;
}

#########################################################
#########################################################
##
##   Generic Interface Routines
##
#########################################################
#########################################################
sub CreateInterface {
    ##
    ## Environment variable initialization
    my $Str = '';
    $Str .= &Apache::lonhtmlcommon::breadcrumbs
        (undef,'Student Submission Reports');
    $Str .= '<p>';
    $Str .= '<table cellspacing="5">'."\n";
    $Str .= '<tr>';
    $Str .= '<td align="center"><b>'.&mt('Sections').'</b></td>';
    $Str .= '<td align="center"><b>'.&mt('Enrollment Status').'</b></td>';
    $Str .= '<td>&nbsp;</td>';
    $Str .= '</tr>'."\n";
    #
    $Str .= '<tr><td align="center">'."\n";
    $Str .= &Apache::lonstatistics::SectionSelect('Section','multiple',5);
    $Str .= '</td>';
    #
    $Str .= '<td align="center">';
    $Str .= &Apache::lonhtmlcommon::StatusOptions(undef,undef,5);
    $Str .= '</td>';
    #
    # Render problem checkbox
    my $prob_checkbox = '<input type="checkbox" name="renderprob" ';
    if (exists($ENV{'form.renderprob'}) && $ENV{'form.renderprob'} eq 'true') {
        $prob_checkbox .= 'checked ';
    }
    $prob_checkbox .= 'value="true" />';
    #
    # Compute correct answers checkbox
    my $ans_checkbox = '<input type="checkbox" name="correctans" ';
    if (exists($ENV{'form.correctans'}) && $ENV{'form.correctans'} eq 'true') {
        $ans_checkbox .= 'checked ';
    }
    $ans_checkbox .= 'value="true" />';
    #
    # Only show last submission checkbox
    my $last_sub_checkbox = '<input type="checkbox" name="last_sub_only" ';
    if (exists($ENV{'form.last_sub_only'}) && 
        $ENV{'form.last_sub_only'} eq 'true') {
        $last_sub_checkbox .= 'checked ';
    }
    $last_sub_checkbox.= 'value="true" />';
    #
    # extra submission data checkbox
    my $subdata_checkbox = '<input type="checkbox" name="subdata" ';
    if (exists($ENV{'form.subdata'}) && 
        $ENV{'form.subdata'} eq 'true') {
        $subdata_checkbox .= 'checked ';
    }
    $subdata_checkbox.= 'value="true" />';
    #
    $Str .= '<td align="right" halign="top">'.'<label><b>'.
        &mt('show problem [_1]',$prob_checkbox).'</b></label><br />'.
        '<label><b>'.
        &mt('compute correct answers [_1]',$ans_checkbox).'</b></label><br />'.
        '<label><b>'.
        &mt('final answer only [_1]',$last_sub_checkbox).'</b></label><br />'.
        '<label><b>'.&mt('show extra submission data [_1]',$subdata_checkbox).
        '</b></label><br />'.
        '</td>';
    #
    $Str .= '</tr>'."\n";
    $Str .= '</table>'."\n";
    #
    $Str .= '<nobr>'.&mt('Status: [_1]',
                         '<input type="text" '.
                         'name="stats_status" size="60" value="" />').
            '</nobr>'.'</p>';    
    ##
    return $Str;
}

1;

__END__