<?php
/**
 * Open Document Definition Handler.
 * This file acts as the endpoint for ODD UUID url requests, exporting the requested data as an
 * OpenDD XML file.
 *
 * @package Elgg
 * @subpackage Core
 */

require_once("../../engine/start.php");

// Get input values, these will be mapped via modrewrite
$guid = get_input("guid"); // guid of the entity

// For attributes eg http://example.com/odd/73/attr/owner_uuid/ or http://example.com/odd/73/metadata/86/
$type = get_input("type"); // attr, metadata, annotation, rekationship
$id_or_name = get_input("idname"); // Either a number or the key name (if attribute)

$body = "";
$title = "";

// Only export the GUID
if (($guid!="") && ($type=="") && ($id_or_name=="")) {
	$entity = get_entity($guid);

	if (!$entity) {
		throw new InvalidParameterException(sprintf(elgg_echo('InvalidParameterException:GUIDNotFound'), $guid));
	}

	$title = "GUID:$guid";
	$body = elgg_view("export/entity", array("entity" => $entity, "uuid" => guid_to_uuid($guid)));
}

// Export an individual attribute
else if (($guid!="") && ($type!="") && ($id_or_name!="")) {
	// Get a uuid
	$entity = get_entity($guid);
	if (!$entity) {
		throw new InvalidParameterException(sprintf(elgg_echo('InvalidParameterException:GUIDNotFound'), $guid));
	}

	$uuid = guid_to_uuid($entity->getGUID()) . "$type/$id_or_name/";

	switch ($type) {
		case 'attr' : // @todo: Do this better? - This is a bit of a hack...
			$v = $entity->get($id_or_name);
			if (!$v) {
				throw new InvalidParameterException(sprintf(elgg_echo('InvalidParameterException:IdNotExistForGUID'), $id_or_name, $guid));
			}

			$m = new ElggMetadata();

			$m->value = $v;
			$m->name = $id_or_name;
			$m->entity_guid = $guid;
			$m->time_created = $entity->time_created;
			$m->time_updated = $entity->time_updated;
			$m->owner_guid = $entity->owner_guid;
			$m->id = $id_or_name;
			$m->type = "attr";
			break;
		case 'metadata' :
			$m = get_metadata($id_or_name);
			break;
		case 'annotation' :
			$m = get_annotation($id_or_name);
			break;
		case 'relationship' :
			$r = get_relationship($id_or_name);
			break;
		case 'volatile' :
			$m = trigger_plugin_hook('volatile', 'metadata', array('guid' => $guid, 'varname' => $id_or_name));
			break;

		default :
			throw new InvalidParameterException(sprintf(elgg_echo('InvalidParameterException:CanNotExportType'), $type));
	}

	// Render metadata or relationship
	if ((!$m) && (!$r)) {
		throw new InvalidParameterException(elgg_echo('InvalidParameterException:NoDataFound'));
	}

	// Exporting metadata?
	if ($m) {
		if ($m->entity_guid!=$entity->guid) {
			throw new InvalidParameterException(elgg_echo('InvalidParameterException:DoesNotBelong'));
		}

		$title = "$type:$id_or_name";
		$body = elgg_view("export/metadata", array("metadata" => $m, "uuid" => $uuid));
	}

	// Exporting relationship
	if ($r) {
		if (($r->guid_one!=$entity->guid) && ($r->guid_two!=$entity->guid)) {
			throw new InvalidParameterException(elgg_echo('InvalidParameterException:DoesNotBelongOrRefer'));
		}

		$title = "$type:$id_or_name";
		$body = elgg_view("export/relationship", array("relationship" => $r, "uuid" => $uuid));
	}
}

// Something went wrong
else {
	throw new InvalidParameterException(elgg_echo('InvalidParameterException:MissingParameter'));
}

page_draw($title, elgg_view_layout('one_column',elgg_view_title($title) . $body));