<?php
/**
 * OpenDD PHP Library.
 *
 * @package Elgg.Core
 * @subpackage ODD
 * @version 0.4
 */

/**
 * Attempt to construct an ODD object out of a XmlElement or sub-elements.
 *
 * @param XmlElement $element The element(s)
 *
 * @return mixed An ODD object if the element can be handled, or false.
 * @access private
 */
function ODD_factory (XmlElement $element) {
	$name = $element->name;
	$odd = false;

	switch ($name) {
		case 'entity' :
			$odd = new ODDEntity("", "", "");
			break;
		case 'metadata' :
			$odd = new ODDMetaData("", "", "", "");
			break;
		case 'relationship' :
			$odd = new ODDRelationship("", "", "");
			break;
	}

	// Now populate values
	if ($odd) {
		// Attributes
		foreach ($element->attributes as $k => $v) {
			$odd->setAttribute($k, $v);
		}

		// Body
		$body = $element->content;
		$a = stripos($body, "<![CDATA");
		$b = strripos($body, "]]>");
		if (($body) && ($a !== false) && ($b !== false)) {
			$body = substr($body, $a + 8, $b - ($a + 8));
		}

		$odd->setBody($body);
	}

	return $odd;
}

/**
 * Import an ODD document.
 *
 * @param string $xml The XML ODD.
 *
 * @return ODDDocument
 * @access private
 */
function ODD_Import($xml) {
	// Parse XML to an array
	$elements = xml_to_object($xml);

	// Sanity check 1, was this actually XML?
	if ((!$elements) || (!$elements->children)) {
		return false;
	}

	// Create ODDDocument
	$document = new ODDDocument();

	// Itterate through array of elements and construct ODD document
	$cnt = 0;

	foreach ($elements->children as $child) {
		$odd = ODD_factory($child);

		if ($odd) {
			$document->addElement($odd);
			$cnt++;
		}
	}

	// Check that we actually found something
	if ($cnt == 0) {
		return false;
	}

	return $document;
}

/**
 * Export an ODD Document.
 *
 * @param ODDDocument $document The Document.
 *
 * @return string
 * @access private
 */
function ODD_Export(ODDDocument $document) {
	return "$document";
}