# The LearningOnline Network with CAPA
# external style responses
#
# $Id: externalresponse.pm,v 1.4 2005/04/07 06:56:21 albertel Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# 1/26 Guy
package Apache::externalresponse;
use strict;
use HTTP::Request::Common;
use Apache::loncapagrade;
use Apache::lonnet;

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

#FIXME
# send of response params and there current values
# accept a string to be printed out (Where does it get shown?) (.message)
# need to get a correct answer from somewhere (probably here since randomized)
sub start_externalresponse {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result;
  my $id = &Apache::response::start_response($parstack,$safeeval);
  return $result;
}

sub end_externalresponse {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result;
  if ($target eq 'grade') {
    if ( defined $env{'form.submitted'}) {
      my $id = $Apache::inputtags::response['-1'];
      my $response = $env{'form.HWVAL_'.$id};
      if ( $response =~ /[^\s]/) {
	my $url = &Apache::lonxml::get_param('url',$parstack,$safeeval);
	my $answer = &Apache::lonxml::get_param('answer',$parstack,$safeeval);
	my %form = &Apache::lonxml::get_param_var('form',$parstack,$safeeval);
	$form{'LONCAPA_student_response'}=$response;
	$form{'LONCAPA_correct_answer'}=$answer;
	$form{'LONCAPA_language'}=
	  &Apache::lonnet::metadata($ENV{'REQUEST_URI'},'language');
	&Apache::lonxml::debug("Asking $url, with:");
	&Apache::lonhomework::showhash(%form);
	my $ua = LWP::UserAgent->new;
	my $res = $ua->request(POST $url, \%form);
	my $partid = $Apache::inputtags::part;
	my $id = $Apache::inputtags::response['-1'];
	my %previous = &Apache::response::check_for_previous($response,
							     $partid,$id);
	%Apache::loncapagrade::results=();
        if ($res->{_rc} != '200') {
	  $Apache::loncapagrade::results{'awardetail'}='ERROR';
	} else {
	  &Apache::lonxml::register('Apache::loncapagrade',('loncapagrade'));
	  my $result=&Apache::scripttag::xmlparse($res->{_content});
	  &Apache::lonxml::debug("Got a result of :$result:");
	}
	foreach my $key (%Apache::loncapagrade::results) {
	  $Apache::lonhomework::results{"resource.$partid.$id.$key"}=
	    $Apache::loncapagrade::results{$key};
	}
	&Apache::response::handle_previous(\%previous,
		    $Apache::loncapagrade::results{'awarddetail'});
	&Apache::lonxml::debug("response of");
	&Apache::lonhomework::showhash(%$res);
	&Apache::lonhomework::showhash(%Apache::loncapagrade::results);
      }
    }
  }
  &Apache::response::end_response;
  return $result;
}

1;
__END__