<?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) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Billing Agreement abstaract class
 *
 * @author Magento Core Team <core@magentocommerce.com>
 */
abstract class Mage_Payment_Model_Billing_AgreementAbstract extends Mage_Core_Model_Abstract
{
    /**
     * Payment method instance
     *
     * @var Mage_Payment_Model_Method_Abstract
     */
    protected $_paymentMethodInstance = null;

    /**
     * Billing Agreement Errors
     *
     * @var array
     */
    protected $_errors = array();

    /**
     * Init billing agreement
     *
     */
    abstract public function initToken();

    /**
     * Verify billing agreement details
     *
     */
    abstract public function verifyToken();

    /**
     * Create billing agreement
     *
     */
    abstract public function place();

    /**
     * Cancel billing agreement
     *
     */
    abstract public function cancel();

    /**
     * Retreive payment method instance
     *
     * @return Mage_Payment_Model_Method_Abstract
     */
    public function getPaymentMethodInstance()
    {
        if (is_null($this->_paymentMethodInstance)) {
            $this->_paymentMethodInstance = Mage::helper('payment')->getMethodInstance($this->getMethodCode());
            $this->_paymentMethodInstance->setStore($this->getStoreId());
        }
        return $this->_paymentMethodInstance;
    }

    /**
     * Validate data before save
     *
     * @return bool
     */
    public function isValid()
    {
        $this->_errors = array();
        if (is_null($this->_paymentMethodInstance) || !$this->_paymentMethodInstance->getCode()) {
            $this->_errors[] = Mage::helper('payment')->__('Payment method code is not set.');
        }
        if (!$this->getReferenceId()) {
            $this->_errors[] = Mage::helper('payment')->__('Reference ID is not set.');
        }
        return empty($this->_errors);
    }

    /**
     * Before save, it's overriden just to make data validation on before save event
     *
     * @throws Mage_Core_Exception
     * @return Mage_Core_Model_Abstract
     */
    protected function _beforeSave()
    {
        if ($this->isValid()) {
            return parent::_beforeSave();
        }
        array_unshift($this->_errors, Mage::helper('payment')->__('Unable to save Billing Agreement:'));
        throw new Mage_Core_Exception(implode(' ', $this->_errors));
    }
}