<?php
/**
 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       Cake.Model
 * @since         CakePHP(tm) v 0.2.9
 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
 */

App::uses('Model', 'Model');

/**
 * ACL Node
 *
 * @package       Cake.Model
 */
class AclNode extends Model {

/**
 * Explicitly disable in-memory query caching for ACL models
 *
 * @var bool
 */
	public $cacheQueries = false;

/**
 * ACL models use the Tree behavior
 *
 * @var array
 */
	public $actsAs = array('Tree' => array('type' => 'nested'));

/**
 * Constructor
 *
 */
	public function __construct() {
		$config = Configure::read('Acl.database');
		if (isset($config)) {
			$this->useDbConfig = $config;
		}
		parent::__construct();
	}

/**
 * Retrieves the Aro/Aco node for this model
 *
 * @param string|array|Model $ref Array with 'model' and 'foreign_key', model object, or string value
 * @return array Node found in database
 * @throws CakeException when binding to a model that doesn't exist.
 */
	public function node($ref = null) {
		$db = $this->getDataSource();
		$type = $this->alias;
		$result = null;

		if (!empty($this->useTable)) {
			$table = $this->useTable;
		} else {
			$table = Inflector::pluralize(Inflector::underscore($type));
		}

		if (empty($ref)) {
			return null;
		} elseif (is_string($ref)) {
			$path = explode('/', $ref);
			$start = $path[0];
			unset($path[0]);

			$queryData = array(
				'conditions' => array(
					$db->name("{$type}.lft") . ' <= ' . $db->name("{$type}0.lft"),
					$db->name("{$type}.rght") . ' >= ' . $db->name("{$type}0.rght")),
				'fields' => array('id', 'parent_id', 'model', 'foreign_key', 'alias'),
				'joins' => array(array(
					'table' => $table,
					'alias' => "{$type}0",
					'type' => 'INNER',
					'conditions' => array("{$type}0.alias" => $start)
				)),
				'order' => $db->name("{$type}.lft") . ' DESC'
			);

			$conditionsAfterJoin = array();

			foreach ($path as $i => $alias) {
				$j = $i - 1;

				$queryData['joins'][] = array(
					'table' => $table,
					'alias' => "{$type}{$i}",
					'type' => 'INNER',
					'conditions' => array(
						$db->name("{$type}{$i}.alias") . ' = ' . $db->value($alias, 'string')
					)
				);

				// it will be better if this conditions will performs after join operation
				$conditionsAfterJoin[] = $db->name("{$type}{$j}.id") . ' = ' . $db->name("{$type}{$i}.parent_id");
				$conditionsAfterJoin[] = $db->name("{$type}{$i}.rght") . ' < ' . $db->name("{$type}{$j}.rght");
				$conditionsAfterJoin[] = $db->name("{$type}{$i}.lft") . ' > ' . $db->name("{$type}{$j}.lft");

				$queryData['conditions'] = array('or' => array(
					$db->name("{$type}.lft") . ' <= ' . $db->name("{$type}0.lft") . ' AND ' . $db->name("{$type}.rght") . ' >= ' . $db->name("{$type}0.rght"),
					$db->name("{$type}.lft") . ' <= ' . $db->name("{$type}{$i}.lft") . ' AND ' . $db->name("{$type}.rght") . ' >= ' . $db->name("{$type}{$i}.rght"))
				);
			}
			$queryData['conditions'] = array_merge($queryData['conditions'], $conditionsAfterJoin);
			$result = $db->read($this, $queryData, -1);
			$path = array_values($path);

			if (!isset($result[0][$type]) ||
				(!empty($path) && $result[0][$type]['alias'] != $path[count($path) - 1]) ||
				(empty($path) && $result[0][$type]['alias'] != $start)
			) {
				return false;
			}
		} elseif (is_object($ref) && $ref instanceof Model) {
			$ref = array('model' => $ref->name, 'foreign_key' => $ref->id);
		} elseif (is_array($ref) && !(isset($ref['model']) && isset($ref['foreign_key']))) {
			$name = key($ref);
			list(, $alias) = pluginSplit($name);

			$model = ClassRegistry::init(array('class' => $name, 'alias' => $alias));

			if (empty($model)) {
				throw new CakeException('cake_dev', "Model class '%s' not found in AclNode::node() when trying to bind %s object", $type, $this->alias);
			}

			$tmpRef = null;
			if (method_exists($model, 'bindNode')) {
				$tmpRef = $model->bindNode($ref);
			}
			if (empty($tmpRef)) {
				$ref = array('model' => $alias, 'foreign_key' => $ref[$name][$model->primaryKey]);
			} else {
				if (is_string($tmpRef)) {
					return $this->node($tmpRef);
				}
				$ref = $tmpRef;
			}
		}
		if (is_array($ref)) {
			if (is_array(current($ref)) && is_string(key($ref))) {
				$name = key($ref);
				$ref = current($ref);
			}
			foreach ($ref as $key => $val) {
				if (strpos($key, $type) !== 0 && strpos($key, '.') === false) {
					unset($ref[$key]);
					$ref["{$type}0.{$key}"] = $val;
				}
			}
			$queryData = array(
				'conditions' => $ref,
				'fields' => array('id', 'parent_id', 'model', 'foreign_key', 'alias'),
				'joins' => array(array(
					'table' => $table,
					'alias' => "{$type}0",
					'type' => 'INNER',
					'conditions' => array(
						$db->name("{$type}.lft") . ' <= ' . $db->name("{$type}0.lft"),
						$db->name("{$type}.rght") . ' >= ' . $db->name("{$type}0.rght")
					)
				)),
				'order' => $db->name("{$type}.lft") . ' DESC'
			);
			$result = $db->read($this, $queryData, -1);

			if (!$result) {
				throw new CakeException(__d('cake_dev', "AclNode::node() - Couldn't find %s node identified by \"%s\"", $type, print_r($ref, true)));
			}
		}
		return $result;
	}

}
