<?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_Backup
 * @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)
 */


/**
 * Backup by cron backend model
 *
 * @category   Mage
 * @package    Mage_Backup
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Backup_Model_Config_Backend_Cron extends Mage_Core_Model_Config_Data
{
    const CRON_STRING_PATH  = 'crontab/jobs/system_backup/schedule/cron_expr';
    const CRON_MODEL_PATH   = 'crontab/jobs/system_backup/run/model';

    const XML_PATH_BACKUP_ENABLED       = 'groups/backup/fields/enabled/value';
    const XML_PATH_BACKUP_TIME          = 'groups/backup/fields/time/value';
    const XML_PATH_BACKUP_FREQUENCY     = 'groups/backup/fields/frequency/value';

    /**
     * Cron settings after save
     *
     * @return Mage_Adminhtml_Model_System_Config_Backend_Log_Cron
     */
    protected function _afterSave()
    {
        $enabled   = $this->getData(self::XML_PATH_BACKUP_ENABLED);
        $time      = $this->getData(self::XML_PATH_BACKUP_TIME);
        $frequency = $this->getData(self::XML_PATH_BACKUP_FREQUENCY);

        $frequencyWeekly  = Mage_Adminhtml_Model_System_Config_Source_Cron_Frequency::CRON_WEEKLY;
        $frequencyMonthly = Mage_Adminhtml_Model_System_Config_Source_Cron_Frequency::CRON_MONTHLY;

        if ($enabled) {
            $cronExprArray = array(
                intval($time[1]),                                   # Minute
                intval($time[0]),                                   # Hour
                ($frequency == $frequencyMonthly) ? '1' : '*',      # Day of the Month
                '*',                                                # Month of the Year
                ($frequency == $frequencyWeekly) ? '1' : '*',       # Day of the Week
            );
            $cronExprString = join(' ', $cronExprArray);
        }
        else {
            $cronExprString = '';
        }

        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) {
            Mage::throwException(Mage::helper('backup')->__('Unable to save the cron expression.'));
        }
    }
}