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- works, in the stupid simple way

# The LearningOnline Network with CAPA
# iimage click response style

#FIXME assumes multiple possbile submissions but only one is possible currently

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 ='';
  my $name;
  my $temp=1;
  foreach $name (@whichopt) {
    $result.=$Apache::response::foilgroup{"$name.text"}."<br />\n";
    my $image=$Apache::response::foilgroup{"$name.image"};
    if ($Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"} =~ /^correct/ ) {
      $result.="<img src=\"$image\"/> <br />\n";
    } else {
      $result.="<input type=\"image\" name=\"HWVAL_$Apache::inputtags::response['-1']:$temp\" src=\"$image\"/> <br />\n";
    }
    $temp++;
  }
  return $result;
}

sub gradefoils {
  my (@whichopt) = @_;
  my $result='';
  my $x;
  my $y;
  my $result;
  my $id=$Apache::inputtags::response['-1'];
  my $temp=1;
  foreach my $name (@whichopt) {
    $x=$ENV{"form.HWVAL_$id:$temp.x"};
    $y=$ENV{"form.HWVAL_$id:$temp.y"};
    &Apache::lonxml::debug("Got a x of $x and a y of $y for $name");
    my @areas = @{ $Apache::response::foilgroup{"$name.area"} };
    my $grade="INCORRECT";
    foreach my $area (@areas) {
      &Apache::lonxml::debug("Area is $area for $name");
      $area =~ m/([a-z]*):/;
      &Apache::lonxml::debug("Area of type $1");
      if ($1 eq 'rectangle') {
	$grade=&grade_rectangle($area,$x,$y);
      } else {
	&Apache::lonxml::error("Unknown area style $area");
      }
      &Apache::lonxml::debug("Area said $grade");
      if ($grade eq 'APPROX_ANS') { last; }
    }
    &Apache::lonxml::debug("Foil was $grade");
    if ($grade eq 'INCORRECT') { $result= 'INCORRECT'; }
    if (($grade eq 'APPROX_ANS') && ($result ne 'APPROX_ANS')) { $result=$grade; }
    &Apache::lonxml::debug("Question is $result");
    $temp++;
  }
  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}="$x:$y";
  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}=$result;
  return '';
}

sub end_foilgroup {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  my $result='';
  my @whichopt;
  if ($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 $max");
    @whichopt = &whichfoils($max);
  }
  if ($target eq 'web') {
    $result=&displayfoils(@whichopt);
  }
  if ($target eq 'grade') {
    if ( defined $ENV{'form.submitted'}) {
      &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);
    if ($name eq '') { $name=$Apache::lonxml::curdepth; }
    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::startredirection; }
  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::endredirection;
  }
  return '';
}

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

sub end_image {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web') {
    my $name = $Apache::imageresponse::curname;
    my $image = &Apache::lonxml::endredirection;
    &Apache::lonxml::debug("out is $image");
    $Apache::response::foilgroup{"$name.image"} = $image;
  }
  return '';
}

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

sub grade_rectangle {
  my ($spec,$x,$y) = @_;
  &Apache::lonxml::debug("Spec is $spec");
  $spec=~m/rectangle:\(([0-9]+),([0-9]+)\)\-\(([0-9]+),([0-9]+)\)/;
  my $x1=$1;
  my $y1=$2;
  my $x2=$3;
  my $y2=$4;
  &Apache::lonxml::debug("Point $x1,$y1,$x2,$y2");
  if ($x1 > $x2) { my $temp=$x1;$x1=$x2;$x2=$temp; }
  if ($y1 > $y2) { my $temp=$y1;$y1=$y2;$y2=$temp; }
  if ($x => $x1) { if ($x <= $x2) { if ($y => $y1) { if ($y <= $y2) { return 'APPROX_ANS'; } } } }
  return 'INCORRECT';
}

sub end_rectangle {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  if ($target eq 'web' || $target eq 'grade') {
    my $name = $Apache::imageresponse::curname;
    my $area = &Apache::lonxml::endredirection;
    &Apache::lonxml::debug("out is $area for $name");
    push @{ $Apache::response::foilgroup{"$name.area"} },"rectangle:$area";
  }
  return '';
}
1;
__END__