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Now has subhandler which can be called externally (for example by publisher)

# The LON-CAPA Homework handler
# Guy Albertelli
# 11/30 Gerd Kortemeyer

package Apache::lonhomework;
use strict;
use Apache::style;
use Apache::lonxml;
use Apache::lonnet;
use Apache::inputtags;
use Apache::structuretags;
use Apache::response;


sub subhandler {
  my ($target,$problem)=@_;
  my %mystyle;
  my $result = '';
  &Apache::inputtags::initialize_inputtags;
  %Apache::lonhomework::results=();
  %Apache::lonhomework::history=&Apache::lonnet::restore;
  #ignore error conditions
  my ($temp)=keys %Apache::lonhomework::history ;
  if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); } 

  my $resultkey;
  foreach $resultkey (sort keys %Apache::lonhomework::history) {
    &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::history{$resultkey}");
  }
  &Apache::lonxml::debug("\n<br>restored values^</br>\n");
  my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
  if ($default == -1) {
    &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
    $default='';
  }

  return Apache::lonxml::xmlparse($target, $problem,
				     $default.&setup_vars($target),%mystyle);
}

sub get_target {
  if ( $ENV{'request.state'} eq "published") {
    return 'web';
  } elsif ($ENV{'request.state'} eq "construct") {
    if ( defined $ENV{'form.preview'}) {
      return 'web';
    } else {
      return 'edit';
    }
  }
}

sub setup_vars {
  my ($target) = @_;
  return ';'
#  return ';$external::target='.$target.';';
}

sub send_header {
  my ($request)= @_;
  $request->print(&Apache::lontexconvert::header());
  $ENV{'request.uri'}=$request->uri;
#  $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
}

sub send_footer {
  my ($request)= @_;
#  $request->print('</form>');
  $request->print(&Apache::lontexconvert::footer());
}

sub getfilenothere {
  my ($filename) = @_;
  my $a="";
  if (! -e $filename ) {
    &Apache::lonnet::subscribe($filename);
    &Apache::lonnet::repcopy($filename);
  }
  {
    my $fh=Apache::File->new($filename);

    while (<$fh>) {
      $a .=$_;
    }
  }
  return $a
}

sub handler {
  my $request=shift;

  $Apache::lonxml::debug=1;
  if ($ENV{'browser.mathml'}) {
    $request->content_type('text/xml');
  } else {
    $request->content_type('text/html');
  }
  $request->send_http_header;
  return 'OK' if $request->header_only;

  &Apache::lonhomework::send_header($request);
  my $file=&Apache::lonnet::filelocation("",$request->uri);
  my $problem=&Apache::lonnet::getfile($file);
  if ($problem == -1) {
    &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
    $problem='';
  }

  my $result=&subhandler(&get_target(),$problem);

  #$request->print("Result follows:");
  $request->print($result);
  #$request->print(":Result ends");

  my $temp;
  my $resultkey;
  foreach $resultkey (sort keys %Apache::lonhomework::results) {
    &Apache::lonxml::debug("$resultkey ---- $Apache::lonhomework::results{$resultkey}");
  }
  &Apache::lonxml::debug("\n<br>storing values^</br>\n");

  &Apache::lonhomework::send_footer($request);
  ($temp) = keys %Apache::lonhomework::results;
  if ( $temp ne '' ) {
    &Apache::lonxml::debug("Store return message:".&Apache::lonnet::cstore(%Apache::lonhomework::results));
  }
  return 'OK';

}

1;
__END__