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Added extra verbage to alleviate confusion as to current status of
spreadsheet compilation.

# The LearningOnline Network with CAPA
#
# $Id: lonstudentsubmissions.pm,v 1.12 2004/06/25 20:43:33 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>');
            $r->print(&Apache::lonstathelpers::render_resource($resource));
            $r->rflush();
            my %Data = &Apache::lonstathelpers::get_problem_data
                ($resource->{'src'});
            my $ProblemData = $Data{$current_problem->{'part'}.
                                    '.'.
                                    $current_problem->{'respid'}};
            &prepare_excel_output($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('.'));
    }
}

#########################################################
#########################################################
##
##      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'});
    $r->print('<h2>'.
              &mt('Preparing Excel spreadsheet of student responses').
              '</h2>'.
              '<p>'.
              &mt('See the status bar above for student answer computation progress').
              '</p>');
    #
    &Apache::lonstathelpers::GetStudentAnswers($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 = ( 'username','domain','attempt','time',
                    'submission','correct', 'grading','awarded','weight',
                    'score');
    my $awarded_col = 7;
    my $weight_col  = 8;
    #
    # 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 {
            foreach my $response (@$results) {
                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();

}

#########################################################
#########################################################
##
##   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 .= '</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>';
    #
    $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__