<?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_Cms
 * @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)
 */

/**
 * Cms page service resource model
 *
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Cms_Model_Resource_Page_Service extends Mage_Core_Model_Resource_Db_Abstract
{
    /**
     * Init cms page service model
     *
     */
    protected function _construct()
    {
        $this->_init('cms/page', 'page_id');
    }

    /**
     * Unlinks from $fromStoreId store pages that have same identifiers as pages in $byStoreId
     *
     * Routine is intented to be used before linking pages of some store ($byStoreId) to other store ($fromStoreId)
     * to prevent duplication of url keys
     *
     * Resolved $byLinkTable can be provided when restoring links from some backup table
     *
     * @param int $fromStoreId
     * @param int $byStoreId
     * @param string $byLinkTable
     *
     * @return Mage_Cms_Model_Mysql4_Page_Service
     */
    public function unlinkConflicts($fromStoreId, $byStoreId, $byLinkTable = null)
    {
        $readAdapter = $this->_getReadAdapter();

        $linkTable = $this->getTable('cms/page_store');
        $mainTable = $this->getMainTable();
        $byLinkTable = $byLinkTable ? $byLinkTable : $linkTable;

        // Select all page ids of $fromStoreId that have identifiers as some pages in $byStoreId
        $select = $readAdapter->select()
            ->from(array('from_link' => $linkTable), 'page_id')
            ->join(
                array('from_entity' => $mainTable),
                $readAdapter->quoteInto(
                    'from_entity.page_id = from_link.page_id AND from_link.store_id = ?',
                    $fromStoreId
                ),
                array()
            )->join(
                array('by_entity' => $mainTable),
                'from_entity.identifier = by_entity.identifier AND from_entity.page_id != by_entity.page_id',
                array()
            )->join(
                array('by_link' => $byLinkTable),
                $readAdapter->quoteInto('by_link.page_id = by_entity.page_id AND by_link.store_id = ?', $byStoreId),
                array()
            );
        $pageIds = $readAdapter->fetchCol($select);

        // Unlink found pages
        if ($pageIds) {
            $writeAdapter = $this->_getWriteAdapter();
            $where = array(
                'page_id IN (?)'   => $pageIds,
                'AND store_id = ?' => $fromStoreId
            );
            $writeAdapter->delete($linkTable, $where);
        }
        return $this;
    }
}
