<?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@magento.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.magento.com for more information.
 *
 * @category    Mage
 * @package     Mage_Tag
 * @copyright  Copyright (c) 2006-2015 X.commerce, Inc. (http://www.magento.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/* @var $installer Mage_Core_Model_Resource_Setup */
$installer = $this;
$installer->startSetup();
$installer->getConnection()->addColumn($installer->getTable('tag/tag'), 'first_store_id', "smallint(5) UNSIGNED NOT NULL DEFAULT '0'");

$groupedTags = $installer->getConnection()->select()
    ->from($installer->getTable('tag/relation'))->group('tag_id')->order('created_at ASC');
$select = $installer->getConnection()->select()
    ->reset()
    ->joinInner(array('relation_table' => new Zend_Db_Expr("({$groupedTags->__toString()})")),
        'relation_table.tag_id = main_table.tag_id', null)
    ->columns(array('first_store_id' => 'store_id'));

$updateSql = $select->crossUpdateFromSelect(array('main_table' => $installer->getTable('tag/tag')));
$installer->getConnection()->query($updateSql);

$installer->endSetup();
