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

/**
 * Class to work with database backups
 *
 * @category    Mage
 * @package     Mage_Backup
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Backup_Db extends Mage_Backup_Abstract
{
    /**
     * Implements Rollback functionality for Db
     *
     * @return bool
     */
    public function rollback()
    {
        set_time_limit(0);
        ignore_user_abort(true);

        $this->_lastOperationSucceed = false;

        $archiveManager = new Mage_Archive();
        $source = $archiveManager->unpack($this->getBackupPath(), $this->getBackupsDir());

        $file = new Mage_Backup_Filesystem_Iterator_File($source);
        foreach ($file as $statement) {
            $this->getResourceModel()->runCommand($statement);
        }
        @unlink($source);

        $this->_lastOperationSucceed = true;

        return true;
    }

    /**
     * Checks whether the line is last in sql command
     *
     * @param $line
     * @return bool
     */
    protected function _isLineLastInCommand($line)
    {
        $cleanLine = trim($line);
        $lineLength = strlen($cleanLine);

        $returnResult = false;
        if ($lineLength > 0){
            $lastSymbolIndex = $lineLength-1;
            if ($cleanLine[$lastSymbolIndex] == ';'){
                $returnResult = true;
            }
        }

        return $returnResult;
    }

    /**
     * Implements Create Backup functionality for Db
     *
     * @return bool
     */
    public function create()
    {
        set_time_limit(0);
        ignore_user_abort(true);

        $this->_lastOperationSucceed = false;

        $backup = Mage::getModel('backup/backup')
            ->setTime($this->getTime())
            ->setType($this->getType())
            ->setPath($this->getBackupsDir())
            ->setName($this->getName());

        $backupDb = Mage::getModel('backup/db');
        $backupDb->createBackup($backup);

        $this->_lastOperationSucceed = true;

        return true;
    }

    /**
     * Get Backup Type
     *
     * @return string
     */
    public function getType()
    {
        return 'db';
    }
}