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- detects previous submissions for <numericalresponse> and <stringresponse>

# The LearningOnline Network with CAPA
# caparesponse definition

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

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

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

sub end_caparesponse {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result = '';
  if ( $target eq 'grade' ) {
    if ( defined $ENV{'form.submitted'}) {
      $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:$Apache::lonxml::curdepth<br>\n");
	}
      }
    }
  } elsif ($target eq 'web') {
    #$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,$tagstack,$parstack,$parser,$safeeval)=@_;
  my $id = &Apache::response::start_response($parstack,$safeeval);
  my $result;
  if ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token,&Apache::lonxml::description($token));
    $result.=&Apache::edit::text_arg('Answer:','answer',$token);
    if ($token->[1] eq 'numericalresponse') {
      $result.=&Apache::edit::text_arg('Unit:','unit',$token,5);
      $result.=&Apache::edit::text_arg('Format:','format',$token,4);
    } else {
      $result.=&Apache::edit::select_arg('Type:','type',
					 ['cs','ci','mc'],$token)
    }
    $result.='</td></tr><tr><td colspan="3">';
  } elsif ($target eq 'modified') {
    my $constructtag;
    if ($token->[1] eq 'numericalresponse') {
      $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
						'answer','unit','format');
    } else {
      $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
						'answer','type');
    }
    if ($constructtag) {
      $result = &Apache::edit::rebuild_tag($token);
      $result.=&Apache::edit::handle_insert();
    }
  }
  return $result;
}

sub end_numericalresponse {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result = '';
  if ( $target eq 'grade' ) {
    if ( defined $ENV{'form.submitted'}) {
      $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
      my $partid = $Apache::inputtags::part;
      my $id = $Apache::inputtags::response['-1'];
      my $response = $ENV{'form.HWVAL'.$id};
      if ( $response =~ /[^\s]/) {
	my %previous = &Apache::response::check_for_previous($response,$partid,$id);
	$Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
	&Apache::lonxml::debug("submitted a $response<br>\n");
	&Apache::lonxml::debug($$parstack[$#$parstack] . "\n<br>");
	$response =~ s/\\/\\\\/g;
	$response =~ s/\'/\\\'/g;
	&Apache::lonxml::debug("current $response");
	my $expression="&caparesponse_check_list('".$response."','".
	  $$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);
	if ( $previous{'used'} && ($previous{'award'} eq $ad) ) {
	  if ($previous{'last'}) {
	    push(@Apache::inputtags::previous,'PREVIOUSLY_LAST');
	  } else {
	    push(@Apache::inputtags::previous,'PREVIOUSLY_USED');
	  }
	}
	$Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$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"};
    my $status = $Apache::inputtags::status['-1'];
    if ($award =~ /^correct/ || $status eq "SHOW_ANSWER" ) {
      my $answervar=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
      my (@answers)=&Apache::run::run("return $answervar",$safeeval,1);
      if (!defined($answers[0])) { $answers[0]=$answervar; } else {
	&Apache::lonxml::debug("answers is $#answers :$answers[0]:");
      }
      my $formatvar=&Apache::lonxml::get_param('format',$parstack,$safeeval);
      my (@formats)=&Apache::run::run("return $formatvar",$safeeval,1);
      if (!defined($formats[0])) { $formats[0]=$formatvar; }

      my $unit=&Apache::lonxml::get_param('unit',$parstack,$safeeval);

      $result="<br></br>The computer got ";

      for (my $i=0; $i <= $#answers; $i++) {
	my $answer=$answers[$i];
	my $format;
	if ($#formats > 0) {
	  $format=$formats[$i];
	} else {
	  $format=$formats[0];
	}
	if ((defined($format)) && ($format ne '')) {
	  &Apache::lonxml::debug("formatting with :$format: answer :$answer:");
	  $result.=sprintf('%.'.$format,$answer).',';
	} else {
	  &Apache::lonxml::debug("no format answer :$answer:");
	  $result.="$answer,";
	}
      }
      chop $result;
      $result.=" $unit.<br></br>";
    }
  } elsif ($target eq 'edit') {
    $result.='</td></tr>'.&Apache::edit::end_table;
  }
  &Apache::response::end_response;
  return $result;
}

sub start_stringresponse {
  return start_numericalresponse(@_);
}

sub end_stringresponse {
  return end_numericalresponse(@_);
}

1;
__END__