<?php
/**
 * 2007-2017 PrestaShop
 *
 * 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@prestashop.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to http://www.prestashop.com for more information.
 *
 * @author    PrestaShop SA <contact@prestashop.com>
 * @copyright 2007-2017 PrestaShop SA
 * @license   http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
 * International Registered Trademark & Property of PrestaShop SA
 */

/* Remove duplicate entries from ps_category_product */
function clean_category_product()
{
    $list = Db::getInstance()->ExecuteS('
	SELECT id_category, id_product, COUNT(*) n
	FROM '._DB_PREFIX_.'category_product
	GROUP BY CONCAT(id_category,\'|\',id_product)
	HAVING n > 1');

    $result = true;
    if ($list) {
        foreach ($list as $l) {
            $result &= Db::getInstance()->Execute('DELETE FROM '._DB_PREFIX_.'category_product
			WHERE id_product = '.(int)$l['id_product'].' AND id_category = '.(int)$l['id_category'].' LIMIT '.(int)($l['n'] - 1));
        }
    }

    return $result;
}
