--- loncom/interface/statistics/lonstudentsubmissions.pm	2008/10/30 17:45:25	1.50
+++ loncom/interface/statistics/lonstudentsubmissions.pm	2011/11/18 22:20:20	1.54.10.3
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonstudentsubmissions.pm,v 1.50 2008/10/30 17:45:25 bisitz Exp $
+# $Id: lonstudentsubmissions.pm,v 1.54.10.3 2011/11/18 22:20:20 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,6 +37,7 @@ use Apache::lonstathelpers;
 use HTML::Entities();
 use Time::Local();
 use Spreadsheet::WriteExcel();
+use Crypt::PasswdMD5;
 use lib '/home/httpd/lib/perl/';
 use LONCAPA;
   
@@ -109,17 +110,40 @@ sub BuildStudentSubmissionsPage {
             return;
         }
         my %already_seen;
-        my @Problems;
+        my (@Problems,$show_named);
+        unless (&Apache::loncommon::needs_gci_custom()) {
+            $show_named = 1;  
+        }
         foreach my $symb (@Symbs) {
             my $resource = $navmap->getBySymb($symb);
             push(@Problems,$resource);
         }
+        # If these are to be anonymized, do a random shuffle of @Students. 
+        unless ($show_named) {
+            &array_shuffle(\@Students);
+        }
+        my $threshold = $env{'course.'.$env{'request.course.id'}.'.internal.anonsurvey_threshold'};
+        if ($threshold eq '') {
+            my %domconfig =
+                &Apache::lonnet::get_dom('configuration',['coursedefaults'],
+                                        $env{'course.'.$env{'request.course.id'}.'.domain'});
+            if (ref($domconfig{'coursedefaults'}) eq 'HASH') {
+                $threshold = $domconfig{'coursedefaults'}{'anonsurvey_threshold'};
+                if ($threshold eq '') {
+                    $threshold = 10;
+                }
+            } else {
+                $threshold = 10;
+            }
+        }
         # 
         $r->print('<h4>'.
                   &Apache::lonstatistics::section_and_enrollment_description().
                   '</h4>');
         if (! scalar(@Problems) || ! defined($Problems[0])) {
             $r->print('resource is undefined');
+        } elsif (!$show_named && @Students < $threshold) {
+            $r->print(&mt('The number of students matching the selection criteria is too few for display of submission data for anonymous surveys.').'<br />'.&mt('There must be at least [quant,_1,student].',$threshold).' '.&mt('Contact the LON-CAPA [_1]Helpdesk[_2] if you need the threshold to be changed for this course.','<a href="/adm/helpdesk?origurl=%2fadm%2fstatistics>','</a>'));
         } else {
             if (scalar(@Problems) == 1) {
                 my $resource = $Problems[0];
@@ -131,11 +155,11 @@ sub BuildStudentSubmissionsPage {
                 }
             }
             if ($env{'form.output'} eq 'excel') {
-                &prepare_excel_output($r,\@Problems,\@Students);
+                &prepare_excel_output($r,\@Problems,\@Students,$show_named);
             } elsif ($env{'form.output'} eq 'csv') {
-                &prepare_csv_output($r,\@Problems,\@Students);
+                &prepare_csv_output($r,\@Problems,\@Students,$show_named);
             } else {
-                &prepare_html_output($r,\@Problems,\@Students);
+                &prepare_html_output($r,\@Problems,\@Students,$show_named);
             }
         }
         $r->print('<hr />');
@@ -154,19 +178,37 @@ sub BuildStudentSubmissionsPage {
     }
 }
 
+sub array_shuffle {
+    my $array = shift;
+    return unless (ref($array) eq 'ARRAY');
+    my $i = scalar(@$array);
+    my $j;
+    foreach my $item (@$array) {
+        --$i;
+        $j = int(rand($i+1));
+        next if($i == $j);
+        @$array [$i,$j] = @$array[$j,$i];
+    }
+    return @$array;
+}
+
 ##
 ## get_extra_response_headers
 ##
+
 sub get_extra_response_headers {
+    my ($show_named) = @_;
     my @extra_resp_headers;
     if ($env{'form.correctans'} eq 'true') {
         push(@extra_resp_headers,'Correct');
-    } 
-    if ($env{'form.prob_status'} eq 'true') {
-        push(@extra_resp_headers,'Award Detail'); 
-        push(@extra_resp_headers,'Time');
-        push(@extra_resp_headers,'Attempt');
-        push(@extra_resp_headers,'Awarded');
+    }
+    if ($show_named) { 
+        if ($env{'form.prob_status'} eq 'true') {
+            push(@extra_resp_headers,'Award Detail'); 
+            push(@extra_resp_headers,'Time');
+            push(@extra_resp_headers,'Attempt');
+            push(@extra_resp_headers,'Awarded');
+        }
     }
     return @extra_resp_headers;
 }
@@ -211,8 +253,9 @@ sub get_headers {
 #########################################################
 #########################################################
 sub prepare_html_output {
-    my ($r,$problems,$students) = @_;
+    my ($r,$problems,$students,$show_named) = @_;
     my $c = $r->connection();
+    my $salt = '$1$'.$Apache::lonnet::perlvar{'AnonymousSalt'};
     #
     # Set a flag for the case when there is just one problem
     my $single_response = 0;
@@ -222,10 +265,18 @@ sub prepare_html_output {
     }
     #
     # Compute the number of columns per response
-    my @extra_resp_headers = &get_extra_response_headers();
+    my @extra_resp_headers = &get_extra_response_headers($show_named);
     #
     # Create the table header
-    my @student_columns = ('username','domain','id','section');
+    my @student_columns;
+    if ($show_named) {
+        @student_columns = @Apache::lonstatistics::SelectedStudentData;
+        if (grep(/^all$/,@student_columns)) {
+            @student_columns = qw(fullname username domain id section status groups comments);
+        }
+    } else {
+        @student_columns = ('username');
+    }
     #
     my %headers;
     my $student_column_count = scalar(@student_columns);
@@ -265,9 +316,10 @@ sub prepare_html_output {
                     $headers{'response'} .=
                         '<th colspan="'.scalar(@headers).'">'.
                         &mt('Response [_1]',$responses->[$i]).'</th>';
-                    $headers{'student'}.= '<th>'.join('</th><th><nobr>',
+                    $headers{'student'}.= '<th><span class="LC_nobreak">'.
+                                          join('</span></th><th><span class="LC_nobreak">',
                                                       @headers).
-                                                          '</nobr></th>';
+                                                          '</span></th>';
                 }
             }
             if ($part_span == 0) {
@@ -284,7 +336,7 @@ sub prepare_html_output {
                 $headers{'part'} .= qq{<th colspan="$part_span">$tmpname</th>};
                 $nonempty_part_headers = 1;
             } else {
-                $headers{'part'} .= qq{<th colspan="$part_span">&nbsp</th>};
+                $headers{'part'} .= qq{<th colspan="$part_span">&nbsp;</th>};
             }
             $prob_span += $part_span;
         }
@@ -324,9 +376,25 @@ sub prepare_html_output {
             $count = 0;
         }
         last if ($c->aborted());
-        foreach my $field (@student_columns) {
-            $student_row_data .= 
-                '<td valign="top">'.$student->{$field}.'</td>';
+        if ($show_named) {
+            foreach my $field (@student_columns) {
+                $student_row_data .= '<td valign="top">';
+                # handle comments like in lonstudentassessment.pm
+                if($field eq 'comments') {
+                    $student_row_data .= 
+                        '<a href="/adm/'.$student->{'domain'}.'/'.
+                        $student->{'username'}.'/'.'aboutme#coursecomment">'.&mt('Comments').'</a>';
+                } else {
+                    $student_row_data .= $student->{$field};
+                }
+                $student_row_data .= '</td>';
+            }
+        } else {
+            my $anonid = &Crypt::PasswdMD5::unix_md5_crypt($student->{'username'},
+                                                           $salt);
+            $anonid = substr($anonid,length($salt)+1);
+            $student_row_data = '<td valign="top" colspan="'.$student_column_count.'">'.
+                                $anonid.'</td>';
         }
         #
         # Figure out what it is we need to output for this student
@@ -443,6 +511,7 @@ sub prepare_html_output {
             undef(@essays);
         }
     } # end of student loop
+    $r->print('</table>'.$/);
     return;
 }
 
@@ -501,7 +570,7 @@ sub html_essay_results {
         if (defined($respid)) {
             $id .= ' '.$respid;
         }
-        $Str .= '<nobr>'.$id.'</nobr>'.('&nbsp;'x4);
+        $Str .= '<span class="LC_nobreak">'.$id.'</span>'.('&nbsp;'x4);
     }
     #
     shift(@$headers); # Get rid of the Submission header
@@ -510,11 +579,11 @@ sub html_essay_results {
         $correct = &html_format_essay_sub($response->{'Correct'});
         shift(@$headers);
     }
-    $Str .= '<nobr>'.
+    $Str .= '<span class="LC_nobreak">'.
         join('',
              map {
                  ('&nbsp;'x4).&mt($_.': [_1]',$response->{$_});
-             } @$headers).'</nobr>';
+             } @$headers).'</span>';
     if (@$headers || ! $single_response) {
         $Str .= '<br />';
     }
@@ -567,7 +636,7 @@ sub html_non_essay_results {
     if ($resptype eq 'radiobutton') {
         $submission = &HTML::Entities::encode($submission,'<>&"');
         $submission =~ s/=([^=])$//;
-        $submission = '<nobr>'.$submission.'</nobr>';
+        $submission = '<span class="LC_nobreak">'.$submission.'</span>';
     }
     $response->{'Submission'} = $submission;
     #
@@ -624,8 +693,9 @@ sub html_non_essay_results {
 #########################################################
 #########################################################
 sub prepare_excel_output {
-    my ($r,$Problems,$Students) = @_;
+    my ($r,$Problems,$Students,$show_named) = @_;
     my $c = $r->connection();
+    my $salt = '$1$'.$Apache::lonnet::perlvar{'AnonymousSalt'};
     #
     #
     # Determine the number of columns in the spreadsheet
@@ -694,7 +764,12 @@ sub prepare_excel_output {
     $worksheet->write($partid_row,0,'Part ID',$format->{'bold'});
     $worksheet->write($respid_row,0,'Response ID',$format->{'bold'});
     # Student headers
-    my @StudentColumns = ('username','domain','id','section');
+    my @StudentColumns;
+    if ($show_named) {
+        @StudentColumns = qw(username domain id section);
+    } else {
+        @StudentColumns = qw(username);
+    }
     foreach (@StudentColumns) {
         $worksheet->write($header_row,$cols_output++,ucfirst($_),
                           $format->{'bold'});
@@ -741,11 +816,9 @@ sub prepare_excel_output {
         last if ($c->aborted());
         $cols_output = 0;
         my $student_row = $max_row;
-        foreach my $field (@StudentColumns) {
-            $worksheet->write($student_row,$cols_output++,
-                              $student->{$field});
-        }
-        my $last_student_col = $cols_output-1;
+        my $anonid = &Crypt::PasswdMD5::unix_md5_crypt($student->{'username'},
+                                                       $salt);
+        $anonid = substr($anonid,length($salt)+1);
         foreach my $prob (@$Problems) {
             foreach my $partid (@{$prob->parts}) {
                 my @Response = $prob->responseIds($partid);
@@ -794,12 +867,17 @@ sub prepare_excel_output {
                 }
             }
         }
-        # Fill in the remaining rows with the students data
-        for (my $row = $student_row+1;$row<$max_row;$row++) {
+        # Prepend current student's user information to all rows 
+        for (my $row = $student_row;$row<$max_row;$row++) {
             my $cols = 0;
             foreach my $field (@StudentColumns) {
-                $worksheet->write($row,$cols++,
-                                  $student->{$field});
+                if ($show_named) {
+                    $worksheet->write($row,$cols++,
+                                      $student->{$field});
+                } else {
+                    $worksheet->write($row,$cols++,
+                                      $anonid);
+                }
             }
         }
         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
@@ -909,8 +987,9 @@ sub excel_format_item {
 #########################################################
 #########################################################
 sub prepare_csv_output {
-    my ($r,$problems,$students) = @_;
+    my ($r,$problems,$students,$show_named) = @_;
     my $c = $r->connection();
+    my $salt = '$1$'.$Apache::lonnet::perlvar{'AnonymousSalt'};
     #
     $r->print('<h2>'.
               &mt('Generating CSV report of student responses').'</h2>');
@@ -939,10 +1018,15 @@ sub prepare_csv_output {
     }
     #
     # Compute the number of columns per response
-    my @extra_resp_headers = &get_extra_response_headers();
+    my @extra_resp_headers = &get_extra_response_headers($show_named);
     #
     # Create the table header
-    my @student_columns = ('username','domain','id','section');
+    my @student_columns;
+    if ($show_named) {
+        @student_columns = qw(username domain id section);
+    } else {
+        @student_columns = qw(username);
+    }
     #
     my %headers;
     push(@{$headers{'student'}},@student_columns);
@@ -991,6 +1075,9 @@ sub prepare_csv_output {
     # Main loop
     foreach my $student (@$students) {
         last if ($c->aborted());
+        my $anonid = &Crypt::PasswdMD5::unix_md5_crypt($student->{'username'},
+                                                       $salt);
+       $anonid = substr($anonid,length($salt)+1);
         my @rows;
         foreach my $prob (@$problems) {
             foreach my $partid (@{$prob->parts}) {
@@ -1031,9 +1118,15 @@ sub prepare_csv_output {
             }
         }
         foreach my $row (@rows) {
-            print $outputfile '"'.join('","',
-                                       map { $student->{$_}; }
-                                       @student_columns).'"';
+            my $student_row_data = '';
+            if ($show_named) {
+                $student_row_data = '"'.join('","',
+                                        map { $student->{$_}; }
+                                        @student_columns).'"';
+            } else {
+                $student_row_data = '"'.$anonid.'"';
+            }
+            print $outputfile $student_row_data;
             for (my $i=scalar(@student_columns);$i<$max_column;$i++) {
                 my $value = &Apache::loncommon::csv_translate($row->[$i]);
                 $value ||='';
@@ -1080,7 +1173,7 @@ sub CreateInterface {
     foreach ('HTML','Excel','CSV') {
         $output_selector .= '    <option value="'.lc($_).'"';
         if ($env{'form.output'} eq lc($_)) {
-            $output_selector .= ' selected ';
+            $output_selector .= ' selected="selected" ';
         }
         $output_selector .='>'.&mt($_).'</option>'.$/;
     } 
@@ -1089,13 +1182,12 @@ sub CreateInterface {
     ## Environment variable initialization
     my $Str = '';
     $Str .= &Apache::lonhtmlcommon::breadcrumbs('Student Submission Reports');
-    $Str .= '<p>';
+    $Str .= '<br />';
     $Str .= &Apache::loncommon::start_data_table();
     $Str .= &Apache::loncommon::start_data_table_header_row();
     $Str .= '<th>'.&mt('Sections').'</th>';
     $Str .= '<th>'.&mt('Groups').'</th>';
     $Str .= '<th>'.&mt('Access Status').'</th>';
-#    $Str .= '<th>'.&mt('Output as [_1]',$output_selector).'</th>';
     $Str .= '<th>'.&mt('Options').'</th>';
     $Str .= '<th>'.&mt('Output Format').'</th>';
     $Str .= &Apache::loncommon::end_data_table_header_row();
@@ -1145,14 +1237,14 @@ sub CreateInterface {
     #
     $Str .= '<td align="right" valign="top">'.
         '<label><b>'.
-        &mt('Show problem [_1]',$prob_checkbox).'</b></label><br />'.
+        &mt('Show problem').' '.$prob_checkbox.'</b></label><br />'.
         '<label><b>'.
-        &mt('Show correct answers [_1]',$ans_checkbox).'</b></label><br />'.
+        &mt('Show correct answers').' '.$ans_checkbox.'</b></label><br />'.
         '<label><b>'.
-        &mt('Show all submissions [_1]',$all_sub_checkbox).
+        &mt('Show all submissions').' '.$all_sub_checkbox.
         '</b></label><br />'.
         '<label><b>'.
-        &mt('Show problem grading [_1]',$prob_status_checkbox).
+        &mt('Show problem grading').' '.$prob_status_checkbox.
         '</b></label><br />'.
         '</td>';
     #