<?php
/* $Id$ */
namespace MCMS\Service;

(defined('MCMS') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use \MCMS\System;
use \MCMS\Model\ModuleInstance;
use MCMS\Module\iInstanceModule;

/**
 * Instance handling service
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package MCMS\System\Service
 */
class InstanceSvc extends InstanceSvcBase {
	private static $TBL_INST = 'moduleinstances';
	private static $TBL_ACL = 'moduleinstanceacls';

	/**
	 * Creates a new module instance in the database
	 *
	 * @param integer $siteId
	 *        	the id of the site
	 * @param string $name
	 *        	the instance name
	 * @param mixed $module        	
	 * @param mixed $access        	
	 */
	public static function createInstance($siteId, $name, $module, $access) {
		$db = System::getInstance()->getDB();
		
		if (class_exists($module)) {
			$reflect = new \ReflectionClass($module);
			if(! $reflect->implementsInterface('\\MCMS\\Module\\iModule'))
				throw new \InvalidArgumentException('Class does not implement iModule');
		}
		else
			throw new \InvalidArgumentException('Invalid class name');
		
		$db->isTransactionSupported() && $db->startTransaction();
		
		$data = new ModuleInstance();
		$data->site_id = $siteId;
		$data->instance = $name;
		$data->module = $module;
		$data->visible = in_array($access, array('none','user','all','acl')) ? $access : 'none';
		
		$db->table(self::$TBL_INST)->insert($data);
		
		$mod = new $module();
		if ($mod instanceof iInstanceModule)
			$mod->createInstance($siteId, $name);
		
		$db->commit();
	}

	/**
	 * Removes the basic instance info rows of a module from the database.
	 *
	 * @param integer $siteId
	 *        	the id of the site
	 * @param string $name
	 *        	the instance name
	 */
	public static function removeInstance($siteId, $name) {
		$db = System::getInstance()->getDB();

		$db->isTransactionSupported() && $db->startTransaction();
		
		ACLSvc::clearInstanceACL($siteId, $name);
		
		$search = array();
		$search['site_id'] = $siteId;
		$search['instance'] = $name;
		
		$r = $db->table(self::$TBL_INST)->select($search);
		$o = $r->fetchObject();
		$r->close();
		$module = $o->module;
		
		if (class_exists($module)) {
			$reflect = new \ReflectionClass($module);
			if($reflect->implementsInterface('\\MCMS\\Module\\iModule')) {
				$mod = new $module();
				if ($mod instanceof iInstanceModule)
					$mod->removeInstance($siteId, $name);
			}
		}
		
		$db->table(self::$TBL_INST)->delete($search);

		$db->isTransactionSupported() && $db->commit();
	}
}