# The LearningOnline Network with CAPA
# iimage click response style

package Apache::imageresponse;
use strict;

sub BEGIN {
  &Apache::lonxml::register('Apache::imageresponse',('imageresponse'));
}

sub start_imageresponse {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  #when in a radiobutton response use these
  &Apache::lonxml::register('Apache::imageresponse',('foilgroup','foil','text','image','rectangle'));
  my $id = &Apache::response::start_response($parstack,$safeeval);
  return '';
}

sub end_imageresponse {
  &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 getfoilcounts {
  my ($parstack,$safeeval)=@_;
  my $rrargs ='';
  if ( $#$parstack > 0 ) { $rrargs=$$parstack['-2']; }
  my $max = &Apache::run::run("{$rrargs;".'return $max}',$safeeval);
  my $count = $#{ $Apache::response::foilgroup{'names'} };
  return ($count,$max);
}

sub whichfoils {
  my ($max)=@_;
  my @names = @{ $Apache::response::foilgroup{'names'} };
  my @whichopt =();
  while ((($#whichopt+1) < $max) && ($#names > -1)) {
    my $aopt=int rand $#names;
    &Apache::lonxml::debug("From $#names elms, picking $aopt");
    $aopt=splice(@names,$aopt,1);
    &Apache::lonxml::debug("Picked $aopt");
    push (@whichopt,$aopt);
  }
  return @whichopt;
}

sub displayfoils {
  my (@whichopt) = @_;
  my $result ='';
  #<input type=image name=timg0 src=/~walt/kap18/picts/ch1map.gif>
  my $name;
  my $temp=1;
  foreach $name (@whichopt) {
    $result.=$Apache::response::foilgroup{"$name.text"}."<br />\n";
    my $image=$Apache::response::foilgroup{"$name.image"};
    $result.="<input type=\"image\" name=\"HWVAL_$Apache::inputtags::response['-1']:$temp\" src=\"$image\"/> <br />\n";
    $temp++;
  }
  return $result;
}

sub end_foilgroup {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  if ($target eq 'web' || $target eq 'grade') {
    &setrandomnumber();
    my ($count,$max) = &getfoilcounts($parstack,$safeeval);
    if ($count>$max) { $count=$max }
    &Apache::lonxml::debug("Count is $count from $max");
    my @whichopt = &whichfoils($max);
  }
  if ($target eq 'web') {
    $result=&displayfoils(@whichopt);
  }
  if ($target eq 'grade') {
    &gradefoils(@whichopt);
  }
  return $result;
}

sub start_conceptgroup {
}

sub end_conceptgroup {
}

$Apache::imageresponse::curname='';
sub start_foil {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($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;
    $Apache::imageresponse::curname=$name;
  }
  return '';
}

sub end_foil {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  return '';
}

sub start_text {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') { 
    $Apache::lonxml::redirection--; 
  }
  return '';
}

sub end_text {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') {
    my $name = $Apache::imageresponse::curname;
    $Apache::response::foilgroup{"$name.text"} = $Apache::lonxml::outputstack;
    if ($target eq 'web' ) {
      $Apache::lonxml::redirection++;
      if ($Apache::lonxml::redirection == 1) { 
	$Apache::lonxml::outputstack=''; 
      }
    }
  }
  return '';
}

sub start_image {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') { $Apache::lonxml::redirection--; }
  return '';
}

sub end_image {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') {
    my $name = $Apache::imageresponse::curname;
    $Apache::response::foilgroup{"$name.image"} = $Apache::lonxml::outputstack;
    if ($target eq 'web' ) {
      $Apache::lonxml::redirection++;
      if ($Apache::lonxml::redirection == 1) {$Apache::lonxml::outputstack='';}
    }
  }
  return '';
}

sub start_rectangle {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') { $Apache::lonxml::redirection--; }
  return '';
}

sub end_rectangle {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') {
    my $name = $Apache::imageresponse::curname;
    push ${ $Apache::response::foilgroup{"$name.area"}},"rectangle:$Apache::lonxml::outputstack";
    if ($target eq 'web' ) {
      $Apache::lonxml::redirection++;
      if ($Apache::lonxml::redirection == 1) {$Apache::lonxml::outputstack='';}
    }
  }
}
1;
__END__