--- loncom/homework/radiobuttonresponse.pm	2001/01/08 21:52:04	1.2
+++ loncom/homework/radiobuttonresponse.pm	2001/01/19 20:05:40	1.9
@@ -1,50 +1,156 @@
 # The LearningOnline Network with CAPA
 # mutliple choice style responses
 
-# 11/23,11/24,11/28 Gerd Kortemeyer
-
 package Apache::radiobuttonresponse;
 use strict;
 
 sub BEGIN {
-  &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse','foilgroup','foil'));
+  &Apache::lonxml::register('Apache::radiobuttonresponse',('radiobuttonresponse'));
 }
 
 sub start_radiobuttonresponse {
+  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
+  #when in a radiobutton response use these
+  &Apache::lonxml::register('Apache::radiobuttonresponse',('foilgroup','foil'));
+  my $id = &Apache::response::start_response($parstack,$safeeval);
+  return '';
 }
 
 sub end_radiobuttonresponse {
+  &Apache::response::end_response;
+  return '';
 }
 
 %Apache::response::foilgroup={};
 sub start_foilgroup {
   %Apache::response::foilgroup={};
+  return '';
+}
+
+sub setrandomnumber {
+  my $rndseed=&Apache::lonnet::rndseed();
+  $rndseed=unpack("%32i",$rndseed);
+  $rndseed=$rndseed
+    +&Apache::lonnet::numval($Apache::inputtags::part)
+      +&Apache::lonnet::numval($Apache::inputtags::response['-1']);
+  srand($rndseed);
+  return '';
 }
 
 sub end_foilgroup {
   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
-  my $name;
+  
   my $result;
-  foreach $name ($Apache::response::foilgroup{'names'}) {
-    $result.="<br><b>$name</b> is <i> $Apache::response::foilgroup{$name.'.value'} </i>";
+  if ($target ne 'meta') {
+    my $name;
+    &setrandomnumber();
+    my ($truecnt,$falsecnt,$max) = &getfoilcounts($parstack,$safeeval);
+    my $count=0;
+    # we will add in 1 of the true statements
+    if (($falsecnt+1)>$max) { $count=$max } else { $count=$falsecnt+1; }
+    my $answer = int(rand ($count));
+    &Apache::lonxml::debug("Answer is $answer, $count from $max, $falsecnt");
+    if ($target eq 'web') {
+      $result=&displayfoils($max,$answer);
+    } elsif ( $target eq 'grade') {
+      if ( defined $ENV{'form.submitted'}) {
+	my $response = $ENV{'form.HWVAL'.$Apache::inputtags::response['-1']};
+	if ( $response =~ /[^\s]/) {
+	  my $id = $Apache::inputtags::response['-1'];
+	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=$response;
+	  &Apache::lonxml::debug("submitted a $response<br>\n");
+	  if ($response == $answer) {
+	    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='EXACT_ANS';
+	  } else {
+	    $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}='INCORRECT';
+	  }
+	}
+      }
+    }
   }
   return $result;
 }
 
+sub getfoilcounts {
+  my ($parstack,$safeeval)=@_;
+  my $rrargs ='';
+  if ( $#$parstack > 0 ) { $rrargs=$$parstack['-2']; }
+  my $max = &Apache::run::run("{$rrargs;".'return $max}',$safeeval);
+  my @names = @{ $Apache::response::foilgroup{'names'} };
+  my $truecnt=0;
+  my $falsecnt=0;
+  my $name;
+
+  foreach $name (@names) {
+    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
+      $truecnt++;
+    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
+      $falsecnt++;
+    }
+  }
+  return ($truecnt,$falsecnt,$max);
+}
+
+sub displayfoils {
+  my ($max,$answer)=@_;
+  my @names = @{ $Apache::response::foilgroup{'names'} };
+  my @truelist;
+  my @falselist;
+  my $result;
+  my $name;
+
+  foreach $name (@names) {
+    #result.="<br><b>$name</b> is <i> $Apache::response::foilgroup{$name.'.value'} </i>";
+    if ($Apache::response::foilgroup{$name.'.value'} eq 'true') {
+      push (@truelist,$name);
+    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'false') {
+      push (@falselist,$name);
+    } elsif ($Apache::response::foilgroup{$name.'.value'} eq 'unused') {
+    } else {
+      &Apache::lonxml::error("Unknown state $Apache::response::foilgroup{$name.'.value'} for $name in <foilgroup>");
+    }
+  }
+  my $whichtrue = rand $#truelist;
+  &Apache::lonxml::debug("Max is $max, From $#truelist elms, picking $whichtrue");
+  my @whichfalse =();
+  while ((($#whichfalse+2) < $max) && ($#falselist > -1)) {
+    my $afalse=rand $#falselist;
+    &Apache::lonxml::debug("From $#falselist elms, picking $afalse");
+    $afalse=splice(@falselist,$afalse,1);
+    &Apache::lonxml::debug("Picked $afalse");
+    push (@whichfalse,$afalse);
+  }
+  splice(@whichfalse,$answer,0,$truelist[$whichtrue]);
+  my $temp=0;
+  &Apache::lonxml::debug("the true statement is $answer");
+  foreach $name (@whichfalse) {
+    $result.="<br /><input type=\"radio\" name=\"HWVAL$Apache::inputtags::response['-1']\" value=\"$temp\">".$Apache::response::foilgroup{$name.'.text'}."</input>\n";
+    $temp++;
+  }
+  return $result."<br />";
+}
+
 sub start_foil {
-  $Apache::lonxml::redirection++;
+  $Apache::lonxml::redirection--;
+  return '';
 }
 
 sub end_foil {
   my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
-  my $args ='';
-  if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
-  my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
-  push @{ $Apache::response::foilgroup{'names'} }, $name;
-  my $value = &Apache::run::run("{$args;".'return $value}',$safeeval);
-  $Apache::response::foilgroup{"$name.value"} = $value;
-  $Apache::response::foilgroup{"$name.text"} = $Apache::lonxml::outputstack;
-  $Apache::lonxml::redirection--;
+  if ($target eq 'web' || $target eq 'grade') {
+    my $args ='';
+    if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
+    my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
+    push @{ $Apache::response::foilgroup{'names'} }, $name;
+    my $value = &Apache::run::run("{$args;".'return $value}',$safeeval);
+    $Apache::response::foilgroup{"$name.value"} = $value;
+    $Apache::response::foilgroup{"$name.text"} = $Apache::lonxml::outputstack;
+  }
+  
+  $Apache::lonxml::redirection++;
+  if ($Apache::lonxml::redirection == 1) { 
+    $Apache::lonxml::outputstack=''; 
+  }
   return '';
 }