<?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@magentocommerce.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.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Adminhtml
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Adminhtml Catalog Product List Sortable allowed sortable attributes source
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Model_System_Config_Source_Catalog_ListSort
{
    /**
     * Retrieve option values array
     *
     * @return array
     */
    public function toOptionArray()
    {
        $options = array();
        $options[] = array(
            'label' => Mage::helper('catalog')->__('Best Value'),
            'value' => 'position'
        );
        foreach ($this->_getCatalogConfig()->getAttributesUsedForSortBy() as $attribute) {
            $options[] = array(
                'label' => Mage::helper('catalog')->__($attribute['frontend_label']),
                'value' => $attribute['attribute_code']
            );
        }
        return $options;
    }

    /**
     * Retrieve Catalog Config Singleton
     *
     * @return Mage_Catalog_Model_Config
     */
    protected function _getCatalogConfig() {
        return Mage::getSingleton('catalog/config');
    }
}
