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<?php

/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * 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@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/**
 * @see Zend_Validate_Abstract
 */
require_once 'Zend/Validate/Abstract.php';

/**
 * @category   Zend
 * @package    Zend_Validate
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Validate_Ccnum extends Zend_Validate_Abstract
{
    /**
     * Validation failure message key for when the value is not of valid length
     */
    const LENGTH   = 'ccnumLength';

/**
     * Validation failure message key for when the value fails the mod-10 checksum
     */
    const CHECKSUM = 'ccnumChecksum';

/**
     * Digits filter for input
     *
     * @var Zend_Filter_Digits
     */
    protected static $_filter = null;

/**
     * Validation failure message template definitions
     *
     * @var array
     */
    protected $_messageTemplates = array(
        self::LENGTH   => "'%value%' must contain between 13 and 19 digits",
        self::CHECKSUM => "Luhn algorithm (mod-10 checksum) failed on '%value%'"
    );

/**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if and only if $value follows the Luhn algorithm (mod-10 checksum)
     *
     * @param  string $value
     * @return boolean
     */
    public function isValid($value)
    {
        $this->_setValue($value);

if (null === self::$_filter) {
            /**
             * @see Zend_Filter_Digits
             */
            require_once 'Zend/Filter/Digits.php';
            self::$_filter = new Zend_Filter_Digits();
        }

$valueFiltered = self::$_filter->filter($value);

$length = strlen($valueFiltered);

if ($length < 13 || $length > 19) {
            $this->_error(self::LENGTH);
            return false;
        }

$sum    = 0;
        $weight = 2;

for ($i = $length - 2; $i >= 0; $i--) {
            $digit = $weight * $valueFiltered[$i];
            $sum += floor($digit / 10) + $digit % 10;
            $weight = $weight % 2 + 1;
        }

if ((10 - $sum % 10) % 10 != $valueFiltered[$length - 1]) {
            $this->_error(self::CHECKSUM, $valueFiltered);
            return false;
        }

return true;
    }

}

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