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


/**
 * Backend Model for product alerts
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Model_System_Config_Backend_Product_Alert_Cron extends Mage_Core_Model_Config_Data
{
    const CRON_STRING_PATH  = 'crontab/jobs/catalog_product_alert/schedule/cron_expr';
    const CRON_MODEL_PATH   = 'crontab/jobs/catalog_product_alert/run/model';

    protected function _afterSave()
    {
        $priceEnable = $this->getData('groups/productalert/fields/allow_price/value');
        $stockEnable = $this->getData('groups/productalert/fields/allow_stock/value');

        $enabled     = $priceEnable || $stockEnable;
        $frequncy    = $this->getData('groups/productalert_cron/fields/frequency/value');
        $time        = $this->getData('groups/productalert_cron/fields/time/value');

        $errorEmail  = $this->getData('groups/productalert_cron/fields/error_email/value');

        $frequencyDaily     = Mage_Adminhtml_Model_System_Config_Source_Cron_Frequency::CRON_DAILY;
        $frequencyWeekly    = Mage_Adminhtml_Model_System_Config_Source_Cron_Frequency::CRON_WEEKLY;
        $frequencyMonthly   = Mage_Adminhtml_Model_System_Config_Source_Cron_Frequency::CRON_MONTHLY;
        $cronDayOfWeek      = date('N');

        $cronExprArray      = array(
            intval($time[1]),                                   # Minute
            intval($time[0]),                                   # Hour
            ($frequncy == $frequencyMonthly) ? '1' : '*',       # Day of the Month
            '*',                                                # Month of the Year
            ($frequncy == $frequencyWeekly) ? '1' : '*',         # Day of the Week
        );

        $cronExprString     = join(' ', $cronExprArray);

        try {
            Mage::getModel('core/config_data')
                ->load(self::CRON_STRING_PATH, 'path')
                ->setValue($cronExprString)
                ->setPath(self::CRON_STRING_PATH)
                ->save();
            Mage::getModel('core/config_data')
                ->load(self::CRON_MODEL_PATH, 'path')
                ->setValue((string) Mage::getConfig()->getNode(self::CRON_MODEL_PATH))
                ->setPath(self::CRON_MODEL_PATH)
                ->save();
        } catch (Exception $e) {
            throw new Exception(Mage::helper('cron')->__('Unable to save the cron expression.'));
        }
    }
}
