<?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_Payment
 * @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)
 */


/**
 * Free payment method
 *
 * @category   Mage
 * @package    Mage_Payment
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Payment_Model_Method_Free extends Mage_Payment_Model_Method_Abstract
{
    /**
     * XML Paths for configuration constants
     */
    const XML_PATH_PAYMENT_FREE_ACTIVE = 'payment/free/active';
    const XML_PATH_PAYMENT_FREE_ORDER_STATUS = 'payment/free/order_status';
    const XML_PATH_PAYMENT_FREE_PAYMENT_ACTION = 'payment/free/payment_action';

    /**
     * Payment Method features
     * @var bool
     */
    protected $_canAuthorize = true;

    /**
     * Payment code name
     *
     * @var string
     */
    protected $_code = 'free';

    /**
     * Check whether method is available
     *
     * @param Mage_Sales_Model_Quote|null $quote
     * @return bool
     */
    public function isAvailable($quote = null)
    {
        return parent::isAvailable($quote) && !empty($quote)
            && Mage::app()->getStore()->roundPrice($quote->getGrandTotal()) == 0;
    }

    /**
     * Get config payment action, do nothing if status is pending
     *
     * @return string|null
     */
    public function getConfigPaymentAction()
    {
        return $this->getConfigData('order_status') == 'pending' ? null : parent::getConfigPaymentAction();
    }
}
