package Apache::hinttags; 

use strict;
use Apache::lonnet;
use capa;

sub BEGIN {
  &Apache::lonxml::register('Apache::hinttags',('hintgroup','hintpart','numericalhint'));
}


@Apache::hint::which=();
sub start_hintgroup {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $skiptoend='0';
  my $result;
  
  if ($target eq 'web') {
    my $id=$Apache::inputtags::part;
    my $numtries=$Apache::lonhomework::history{"resource.$id.tries"};
    if ( $numtries eq '') { $numtries = 0; }
    my $hinttries=&Apache::lonnet::EXT("resource.$id.hinttries");
    if ( $hinttries eq '') { $hinttries = 1; }
    &Apache::lonxml::debug("found :$id:$numtries:$hinttries:");
    if ( $numtries < $hinttries ) {
      $skiptoend='1';
    } else {
      if ($target eq 'web') {$result='<table bgcolor="#dddddd"><tr><td>';}
    }
  }
  if ($skiptoend) {
    &Apache::lonxml::get_all_text("/hintgroup",$$parser[$#$parser]);
  }
  @Apache::hint::which=();
  return $result;
}

sub end_hintgroup {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result;

  if ($target eq 'web') {
    my $id=$Apache::inputtags::part;
    my $numtries=$Apache::lonhomework::history{"resource.$id.tries"};
    if ( $numtries eq '') { $numtries = 0; }
    my $hinttries=&Apache::lonnet::EXT("resource.$id.hinttries");
    if ( $hinttries eq '') { $hinttries = 1; }
    &Apache::lonxml::debug("found :$id:$numtries:$hinttries:");
    if ( $numtries => $hinttries ) {
      if ($target eq 'web') {$result='</td></tr></table>';}
    }	
  }
  @Apache::hint::which='';
  return $result;
}

sub start_numericalhint {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  #do everything in end, so intervening <responseparams> work
  &Apache::response::start_hintresponse($parstack,$safeeval);
  return '';
}

sub end_numericalhint {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
  my $result;
  if ($target eq 'web') {
    $safeeval->share_from('capa',['&caparesponse_capa_check_answer']);
    my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
    my $response = $Apache::lonhomework::history{"resource.$Apache::inputtags::part.$Apache::inputtags::response['-1'].submission"};
    &Apache::lonxml::debug("hintgroup is using $response<br />\n");
    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,$safeeval);
    &Apache::lonxml::debug("$expression:result:$result:$Apache::lonxml::curdepth");
    my ($awards) = split /:/ , $result;
    my ($ad) = &Apache::inputtags::finalizeawards(split /,/ , $awards);
    if ($ad eq 'EXACT_ANS' || $ad eq 'APPROX_ANS') { push (@Apache::hint::which,$name); }
    $result='';
  }
  &Apache::response::end_hintresponse();
  return $result;
}

# a part shows if it is on, if no specific parts are on, then default shows
sub start_hintpart {
  my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;

  my $show ='0';

  if ($target eq 'web') {
    my $on= &Apache::lonxml::get_param('on',$parstack,$safeeval);
    &Apache::lonxml::debug("hintpart sees $on and ,$#Apache::hint::which");
    if ( $on eq 'default' && $#Apache::hint::which == '-1') {
      $show=1;
    } else {
      my $which;
      foreach $which (@Apache::hint::which) { if ($which eq $on) { $show = 1; last } }
    }
    if (!$show) {
      &Apache::lonxml::get_all_text("/hintpart",$$parser[$#$parser]);
    }
  } elsif ($target eq 'grade') {
    &Apache::lonxml::get_all_text("/hintpart",$$parser[$#$parser]);
  }
  return '';
}

sub end_hintpart {
  return '';
}

1;
__END__