--- loncom/homework/essayresponse.pm	2001/12/04 15:17:56	1.5
+++ loncom/homework/essayresponse.pm	2002/07/25 20:51:39	1.11
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # essay (ungraded) style responses
 #
-# $Id: essayresponse.pm,v 1.5 2001/12/04 15:17:56 albertel Exp $
+# $Id: essayresponse.pm,v 1.11 2002/07/25 20:51:39 ng Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -26,37 +26,89 @@
 # http://www.lon-capa.org/
 #
 # 4/3 Guy
+# July, 2002, H. K. Ng
+#
 package Apache::essayresponse;
 use strict;
 
-sub BEGIN {
-  &Apache::lonxml::register('Apache::essayresponse',('essayresponse'));
+BEGIN {
+    &Apache::lonxml::register('Apache::essayresponse',('essayresponse'));
 }
 
 sub start_essayresponse {
-  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
-  my $result;
-  my $id = &Apache::response::start_response($parstack,$safeeval);
-  if ($target eq 'meta') {
-    $result=&Apache::response::meta_package_write('essayresponse');
-  }
-  return $result;
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $result;
+
+    if ($target eq 'web') {
+	my $part= $Apache::inputtags::part;
+	my $id  = &Apache::response::start_response($parstack,$safeeval);
+
+	my $ncol= &Apache::lonnet::EXT("resource.$part".'_'."$id.maxcollaborators");
+	my $coll= &HTML::Entities::encode($Apache::lonhomework::history{"resource.$part.$id.collaborators"});
+	if ($ncol > 0) {
+	    $result .='<br />Collaborators: <input type="text" size="70" max="80" name="HWCOL'.
+		$id.'" value="'.$coll.'" /><br />'.
+		'(Enter maximum '.$ncol.' collaborators using username or username@domain, e.g. '.
+		'smithje or smithje@'.$ENV{'user.domain'}.'.)<br />';
+	    $result .= &check_collaborators($ncol,$coll) if ($coll =~ /\w+/);
+	}
+    }
+    return $result;
 }
 
 sub end_essayresponse {
-  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
-  if ( $target eq 'grade' ) {
-    if ( defined $ENV{'form.submitted'}) {
-      my $id = $Apache::inputtags::response['-1'];
-      my $response = $ENV{'form.HWVAL'.$Apache::inputtags::response['-1']};
-      if ( $response =~ /[^\s]/) {
-	$Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=$response;
-	$Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}="SUBMITTED";
-      }
-    }
-  }
-  &Apache::response::end_response;
-  return '';
+    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
+    my $part=$Apache::inputtags::part;
+    my $id  = &Apache::response::start_response($parstack,$safeeval);
+    my $collaborators = $ENV{'form.HWCOL'.$id};	
+    if ($collaborators =~ /[^\s]/) {
+	$Apache::lonhomework::results{"resource.$part.$id.collaborators"}=$collaborators;
+    }
+    if ( $target eq 'grade' ) {
+	if ( defined $ENV{'form.submitted'}) {
+	    my $response      = $ENV{'form.HWVAL'.$id};
+	    if ( $response =~ /[^\s]/) {
+		$Apache::lonhomework::results{"resource.$part.$id.submission"}=$response;
+		$Apache::lonhomework::results{"resource.$part.$id.awarddetail"}="SUBMITTED";
+		my %previous=&Apache::response::check_for_previous($response,$part,$id);
+		&Apache::response::handle_previous(\%previous,'SUBMITTED');
+	    }
+	}
+    }
+
+    &Apache::response::end_response;
+    return '';
+}
+
+sub check_collaborators {
+    my ($ncol,$coll) = @_;
+    my %classlist=&Apache::lonnet::dump('classlist',
+					$ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
+					$ENV{'course.'.$ENV{'request.course.id'}.'.num'});
+    my (@badcollaborators,$result);
+    my (@collaborators) = split(/\,?\s+/,$coll);
+    foreach (@collaborators) {
+	my $collaborator = $_;
+	if (/@/) {
+	    $collaborator =~ s/@/:/;
+	} else {
+	    $collaborator = $_.':'.$ENV{'user.domain'};
+	}
+	push @badcollaborators, $_ if (!grep /^$collaborator/i,keys %classlist);
+    }
+    
+    if (scalar(@badcollaborators)) {
+	$result = '<table border="0"><tr bgcolor="#ffbbbb"><td> The following user'.
+	    (scalar(@badcollaborators) > 1 ? 's are' : ' is').' invalid: '.
+	    join(', ',@badcollaborators).'. Please correct.</td></tr></table>';
+    }
+    my $toomany = scalar(@collaborators) - $ncol;
+    if ($toomany > 0) {
+	$result .= '<table border="0"><tr bgcolor="#ffbbbb"><td>'.
+	    'You have too many collaborators. Please remove '.$toomany.' collaborator'.
+	    ($toomany > 1 ? 's' :'').'.</td></tr></table>';
+    }
+    return $result;
 }
 
 1;