# The LearningOnline Network with CAPA
# caparesponse definition

package Apache::caparesponse;
use strict;
use capa;

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

sub start_caparesponse {
  my ($target,$token,$parstack,$parser,$safeeval)=@_;
  my $id = &Apache::response::start_response($parstack,$safeeval);
  return '';
}

sub end_caparesponse {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  my $result = '';
  if ( $target eq 'grade' ) {
    if ( defined $ENV{'form.submit'}) {
      $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
      my $response = $ENV{'form.HWVAL'.$Apache::inputtags::response['-1']};
      if ( $response =~ /[^\s]/) {
	my $id = $Apache::inputtags::response['-1'];
	my $previous= &Apache::response::check_for_previous($response,$id,$response);
	if ( $previous ) { 
	  $result = 'PREVIOUSLY_USED';
	} else {
	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=$response;
	  &Apache::lonxml::debug("submitted a $response<br>\n");
	  &Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
	  my $expression="&caparesponse_check('".$response."','".
	    $$parstack[$#$parstack].
	      ';my $tol="'.$Apache::inputtags::params{'tol'}.'"'.
		';my $sig="'.$Apache::inputtags::params{'sig'}.'"'.
		  "');";
	  $result = &Apache::run::run($expression,$safeeval);
	  my ($ad) = split /:/ , $result;
	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}=$ad;
	  &Apache::lonxml::debug("$expression");
	  &Apache::lonxml::debug("\n<br>result:$result:$Apache::lonxml::curdepth<br>\n");
	}
      }
    }
  } else {
    #$result .= "The correct answer is ".&Apache::run::run("{$$parstack['-1'];".'return $answer}',$safeeval)."\n";
  }
  #Apache::lonxml::debug("\n<br>\nreal end caparesponse<br>\n");
  &Apache::response::end_response;
  return '';
}

sub start_numericalresponse {
  my ($target,$token,$parstack,$parser,$safeeval)=@_;
  my $id = &Apache::response::start_response($parstack,$safeeval);
  return '';
}

sub end_numericalresponse {
  my ($target,$token,$parstack,$parser,$safeeval,$style)=@_;
  my $result = '';
  if ( $target eq 'grade' ) {
    if ( defined $ENV{'form.submit'}) {
      $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
      my $response = $ENV{'form.HWVAL'.$Apache::inputtags::response['-1']};
      if ( $response =~ /[^\s]/) {
	my $id = $Apache::inputtags::response['-1'];
	my $previous= &Apache::response::check_for_previous($response,$id,$response);
	if ( $previous ) { 
	  $result = 'PREVIOUSLY_USED';
	} else {
	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.submission"}=$response;
	  &Apache::lonxml::debug("submitted a $response<br>\n");
	  &Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
	  my $expression="&caparesponse_check_list('".$response."','".
	    $$parstack[$#$parstack].
	      ';my $tol="'.$Apache::inputtags::params{'tol'}.'"'.
	      ';my $sig="'.$Apache::inputtags::params{'sig'}.'"'.
		"');";
	  $result = &Apache::run::run($expression,$safeeval);
	  my ($awards) = split /:/ , $result;
	  my ($ad) = &Apache::inputtags::finalizeawards(split /,/ , $awards);
	  $Apache::lonhomework::results{"resource.$Apache::inputtags::part.$id.awarddetail"}=$ad;
	  &Apache::lonxml::debug("$expression");
	  &Apache::lonxml::debug("\n<br>result:$result:$Apache::lonxml::curdepth<br>\n");
	  $result='';
	}
      }
    }
  } elsif ($target eq 'web') {
    my $award = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
    if ($award =~ /^correct/) {
      my $answervar=&Apache::run::run("{$$parstack['-1'];".'return $answer}',$safeeval);
      my (@answers)=&Apache::run::run("$answervar",$safeeval);
      my $unit=&Apache::run::run("{$$parstack['-1'];".'return $unit}',$safeeval);
      
      $result="<br></br>The computer got ";
      my $answer;
      foreach $answer (@answers) { $result.="$answer,"; }
      chop $result;
      $result.=" $unit.<br></br>";
    }
  }
  &Apache::response::end_response;
  return $result;
}

1;
__END__