#!/usr/bin/env perl

=head1 NAME

Base - A module that provides basic methods for the creation of perfSONAR XML 
fragments. 

=head1 DESCRIPTION

The purpose of this module simplify the creation of valid XML for the various
perfSONAR_PS services.

=head1 API


=cut

package perfSONAR_PS::XML::Base;

use perfSONAR_PS::XML::Namespace;
use Log::Log4perl qw(get_logger);

@ISA = ('Exporter');
@EXPORT = ('createEndPointL4', 'createSubjectL4', 'createSubjectL3', 
           'createParameters' );

our $VERSION = 0.08;

our $logger = &get_logger( "perfSONAR_PS::XML::Base");


=head2 createEndPointL4( $doc, $ns, $hash, $role, $protocol )

Creates the following LibXML fragment:

  <nmwgt:endPoint role="src" protocol="icmp">
    <nmwgt:interface>
      <nmwgt:ifHostName>iepm-bw.slac.stanford.edu<nmwgt:ifHostName>
      <nmwgt:ipAddress>134.79.240.38</nmwgt:ipAddress>
    </nmwgt:interface>
  </nmwgt:endPoint>

Where $doc is the libXML document class, $ns is a hash of namespace references, $role is either
'src' or 'dst' and protocol is 'icmp' or 'tcp' or 'udp'. The $hash input is a assoc. hash of key, 
value pairs that will be inserted as children of the 'interface' element as tagname textContent() 
pairs.
=cut
#TODO: support port numbers, the type attribute
sub createEndPointL4
{
	my $doc = shift;
	my $ns = shift; # perfsonarps::xml::namespace object
	
	my $hash = shift; # hash of key=element tag, value=text value pairs

	my $role = shift;
	my $protocol = shift;

	#$logger->debug( "creating source" );	
	my $endPoint = $doc->createElement( 'endPoint' );
	
	$endPoint->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$endPoint->setAttribute( 'role',  $role ) if defined $role;
	$endPoint->setAttribute( 'protocol', $protocol ) if defined $protocol;

	my $interface = $doc->createElement( 'interface' );
	$interface->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$endPoint->appendChild( $interface );
	
	while( my( $k, $v ) = each %$hash ) {
		my $key = $doc->createElement( $k );
		$key->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' ); #TODO!
		my $text = XML::LibXML::Text->new( $v );
		$key->appendChild( $text );
	
		$interface->appendChild( $key );
	}		

	return $endPoint;

}

=head2 createSubjectL4( $doc, $ns, $baseNS, $protocol, $source, $dest, $sourceIP, $destIP )

Creates the subject XML fragment as follows:

    <pinger:subject id="pingsubject--slac.stanford.edu--frcu.eun.eg" 
      <nmtl4:endPointPair>
        <nmtl4:endPoint role="src" protocol="icpm">
          <nmtl3:interface id="#d1">
            <nmtl3:ifHostName>iepm-bw.slac.stanford.edu"</nmtl3:ifHostName>     
            <nmtl3:ipAddress>134.79.240.38</nmtl3:ipAddress>   
          </nmtl3:interface>
        </nmtl4:endPoint>
        <nmtl4:endPoint role="dst" protocol="icpm">
          <nmtl3:interface id="#a1">
            <nmtl3:ifHostName>atlang-hstnng.abilene.ucaid.edu</nmtl3:ifHostName>
            <nmtl3:ipAddress>"198.32.8.34</nmtl3:ipAddress>
          </nmtl3:interface>
        </nmtl4:endPoint>
      </nmtl4:endPointPair>
    </pinger:subject>

=cut
sub createSubjectL4
{
	my $doc = shift;
	my $ns = shift;

	my $baseNS = shift;
	my $protocol = shift;

	my $sourceAddress = shift;
	my $destinationAddress = shift;
	
	my $sourceIP = shift;
	my $destinationIP = shift;
	
	# subject
	#$logger->debug( "creating subject" );	
	my $subj = $doc->createElement( 'subject' );
	$subj->setNamespace( $ns->{$baseNS}, $baseNS );

	#$logger->debug( "creating endpoint pair" );	
	my $endPoint = $doc->createElement( 'endPointPair' );
	$endPoint->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	
	$subj->appendChild( $endPoint );	

	my $source = &createEndPointL4( $doc, $ns, { 'ifHostName' => $sourceAddress, 'ipAddress' => $sourceIP }, 'src', $protocol  );
	$endPoint->appendChild( $source );
	
	#$logger->debug( "creating dest" );	
	my $dest = &createEndPointL4( $doc, $ns, { 'ifHostName' => $destinationAddress, 'ipAddress' => $destinationIP }, 'dst', $protocol  );
	$endPoint->appendChild( $dest );

	return $subj;
}



=head2 createSubjectL3( $doc, $ns, $baseNS, $protocol, $source, $dest )

Creates the subject XML fragment as follows:

=cut
sub createSubjectL3
{
	my $doc = shift;
	my $ns = shift;
	
	my $baseNS = shift;
	my $protocol = shift;

	my $sourceAddress = shift;
	my $destinationAddress = shift;


	# subject
	#$logger->debug( "creating subject" );	
	my $subj = $doc->createElement( 'subject' );
	$subj->setNamespace( $ns->getNsByKey($baseNS), $baseNS );

	#$logger->debug( "creating endpoint pair" );	
	my $endPoint = $doc->createElement( 'endPointPair' );
	$endPoint->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$subj->appendChild( $endPoint );	

	#$logger->debug( "creating source" );	
	my $source = $doc->createElement( 'endPoint' );
	$source->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$source->setAttribute( 'role', 'src' );
	$source->setAttribute( 'protocol', $protocol );
	$endPoint->appendChild( $source );

	my $sourceNode = $doc->createElement( 'address' );
	$sourceNode->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$sourceNode->setAttribute( 'value', $sourceAddress ); #TODO:
	$source->appendChild( $sourceNode );


	#$logger->debug( "creating dest" );	
	my $dest = $doc->createElement( 'endPoint' );
	$dest->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$dest->setAttribute( 'role', 'dst' );
	$dest->setAttribute( 'protocol', $protocol );
	$endPoint->appendChild( $dest );

	my $destNode = $doc->createElement( 'address' );
	$destNode->setNamespace( $ns->getNsByKey('nmwgt'), 'nmwgt' );
	$destNode->setAttribute( 'value', $destinationAddress );
	$dest->appendChild( $destNode );

	return $subj;
	
}


sub createParameters
{
	my $doc = shift;
	my $ns = shift;
	
	my $baseNS = shift;
	
	my $hash = shift;

	
	my $param = $doc->createElement( 'parameters' );
	$param->setNamespace( $ns->getNsByKey($baseNS), $baseNS );

	
	while( my ($k,$v) = each %{$hash} ) {
		next if $k =~ /^test/ || $k =~ /^dest/ || $k =~ /^src/ ;
		my $p = $doc->createElement( 'parameter' );
		$p->setNamespace( $ns->getNsByKey('nmwg'), 'nmwg' );
		$p->setAttribute( 'name', $k );
		my $text = XML::LibXML::Text->new( $v );
		$p->appendChild( $text );
		$param->appendChild( $p );
	}

	return $param;
}







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