1: <?php
 2: /**
 3:  * Magento
 4:  *
 5:  * NOTICE OF LICENSE
 6:  *
 7:  * This source file is subject to the Open Software License (OSL 3.0)
 8:  * that is bundled with this package in the file LICENSE.txt.
 9:  * It is also available through the world-wide-web at this URL:
10:  * http://opensource.org/licenses/osl-3.0.php
11:  * If you did not receive a copy of the license and are unable to
12:  * obtain it through the world-wide-web, please send an email
13:  * to license@magentocommerce.com so we can send you a copy immediately.
14:  *
15:  * DISCLAIMER
16:  *
17:  * Do not edit or add to this file if you wish to upgrade Magento to newer
18:  * versions in the future. If you wish to customize Magento for your
19:  * needs please refer to http://www.magentocommerce.com for more information.
20:  *
21:  * @category    Mage
22:  * @package     Mage_CatalogRule
23:  * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
24:  * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
25:  */
26: 
27: /**
28:  * CatalogRule data helper
29:  */
30: class Mage_CatalogRule_Helper_Data extends Mage_Core_Helper_Abstract
31: {
32:     /**
33:      * Algorithm for calculating price rule
34:      *
35:      * @param  string $actionOperator
36:      * @param  int $ruleAmount
37:      * @param  float $price
38:      * @return float|int
39:      */
40:     public function calcPriceRule($actionOperator, $ruleAmount, $price)
41:     {
42:         $priceRule = 0;
43:         switch ($actionOperator) {
44:             case 'to_fixed':
45:                 $priceRule = min($ruleAmount, $price);
46:                 break;
47:             case 'to_percent':
48:                 $priceRule = $price * $ruleAmount / 100;
49:                 break;
50:             case 'by_fixed':
51:                 $priceRule = max(0, $price - $ruleAmount);
52:                 break;
53:             case 'by_percent':
54:                 $priceRule = $price * (1 - $ruleAmount / 100);
55:                 break;
56:         }
57:         return $priceRule;
58:     }
59: }
60: