<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magento.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magento.com for more information.
 *
 * @category    Mage
 * @package     Mage_Admin
 * @copyright  Copyright (c) 2006-2016 X.commerce, Inc. and affiliates (http://www.magento.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Resource model for manipulate system variables
 *
 * @category   Mage
 * @package    Mage_Admin
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Admin_Model_Resource_Variable extends Mage_Core_Model_Resource_Db_Abstract
{
    /**
     * Cache id
     */
    const CACHE_ID = 'permission_variable';

    /**
     * Define main table
     */
    protected function _construct()
    {
        $this->_init('admin/permission_variable', 'variable_id');
    }

    /**
     * Regenerate cache
     */
    protected function _generateCache()
    {
        /** @var Mage_Admin_Model_Resource_Variable_Collection $collection */
        $collection = Mage::getResourceModel('admin/variable_collection');
        $collection->addFieldToFilter('is_allowed', array('eq' => 1));
        $data = $collection->getColumnValues('variable_name');
        $data = array_flip($data);
        Mage::app()->saveCache(
            Mage::helper('core')->jsonEncode($data),
            self::CACHE_ID,
            array(Mage_Core_Model_App::CACHE_TAG)
        );
    }

    /**
     * Get allowed types
     */
    public function getAllowedPaths()
    {
        $data = Mage::app()->getCacheInstance()->load(self::CACHE_ID);
        if ($data === false) {
            $this->_generateCache();
            $data = Mage::app()->getCacheInstance()->load(self::CACHE_ID);
        }
        return Mage::helper('core')->jsonDecode($data);
    }

    /**
     * @param Mage_Core_Model_Abstract $object
     * @return $this
     */
    protected function _afterSave(Mage_Core_Model_Abstract $object)
    {
        $this->_generateCache();
        return parent::_afterSave($object);
    }

    /**
     * @param Mage_Core_Model_Abstract $object
     * @return $this
     */
    protected function _afterDelete(Mage_Core_Model_Abstract $object)
    {
        $this->_generateCache();
        return parent::_afterDelete($object);
    }
}