<?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_CatalogRule
 * @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)
 */


/**
 * Catalog Rule Product Aggregated Price per date Resource Model
 *
 * @category    Mage
 * @package     Mage_CatalogRule
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_CatalogRule_Model_Mysql4_Rule_Product_Price extends Mage_Core_Model_Mysql4_Abstract
{
    /**
     * Initialize connection and define main table
     *
     */
    protected function _construct()
    {
        $this->_init('catalogrule/rule_product_price', 'rule_product_price_id');
    }

    /**
     * Apply price rule price to price index table
     *
     * @param Varien_Db_Select $select
     * @param array|string $indexTable
     * @param string $entityId
     * @param string $customerGroupId
     * @param string $websiteId
     * @param array $updateFields       the array of fields for compare with rule price and update
     * @param string $websiteDate
     * @return Mage_CatalogRule_Model_Rule_Product_Price
     */
    public function applyPriceRuleToIndexTable(Varien_Db_Select $select, $indexTable, $entityId, $customerGroupId,
        $websiteId, $updateFields, $websiteDate)
    {
        if (empty($updateFields)) {
            return $this;
        }

        if (is_array($indexTable)) {
            foreach ($indexTable as $k => $v) {
                if (is_string($k)) {
                    $indexAlias = $k;
                } else {
                    $indexAlias = $v;
                }
                break;
            }
        } else {
            $indexAlias = $indexTable;
        }

        // join rule to select
        $select->join(
            array('rp' => $this->getMainTable()),
            "rp.product_id = {$entityId} AND rp.website_id = {$websiteId}"
                . " AND rp.customer_group_id = {$customerGroupId}"
                . " AND rp.rule_date = {$websiteDate}",
            array());

        foreach ($updateFields as $priceField) {
            $priceCond = $this->_getWriteAdapter()->quoteIdentifier(array($indexAlias, $priceField));
            $priceExpr = new Zend_Db_Expr("IF(rp.rule_price < {$priceCond}, rp.rule_price, {$priceCond})");
            $select->columns(array($priceField => $priceExpr));
        }

        $query = $select->crossUpdateFromSelect($indexTable);
        $this->_getWriteAdapter()->query($query);

        return $this;
    }
}