<?php

/* -----------------------------------------------------------------------------------------
   $Id: cc_validation.php 1037 2005-07-17 15:25:32Z gwinger $   

   XT-Commerce - community made shopping
   http://www.xt-commerce.com

   Copyright (c) 2003 XT-Commerce
   -----------------------------------------------------------------------------------------
   based on: 
   (c) 2000-2001 The Exchange Project  (earlier name of osCommerce)
   (c) 2002-2003 osCommerce(cc_validation.php,v 1.3 2003/02/12); www.oscommerce.com 
   (c) 2003	 nextcommerce (cc_validation.php,v 1.4 2003/08/13); www.nextcommerce.org

   Released under the GNU General Public License 
   ---------------------------------------------------------------------------------------*/

class cc_validation_ORIGIN {
	var $cc_type, $cc_number, $cc_expiry_month, $cc_expiry_year;

	function validate($number, $expiry_m, $expiry_y) {
		$this->cc_number = preg_replace('/[^0-9]/', '', $number);

		if (preg_match('/^4[0-9]{12}([0-9]{3})?$/', $this->cc_number)) {
			$this->cc_type = 'Visa';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_VISA) != 'true')
				return -8;
		}
		elseif (preg_match('/^5[1-5][0-9]{14}$/', $this->cc_number)) {
			$this->cc_type = 'Master Card';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_MASTERCARD) != 'true')
				return -8;
		}
		elseif (preg_match('/^3[47][0-9]{13}$/', $this->cc_number)) {
			$this->cc_type = 'American Express';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_AMERICANEXPRESS) != 'true')
				return -8;
		}
		elseif (preg_match('/^3(0[0-5]|[68][0-9])[0-9]{11}$/', $this->cc_number)) {
			$this->cc_type = 'Diners Club';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_DINERSCLUB) != 'true')
				return -8;
		}
		elseif (preg_match('/^6011[0-9]{12}$/', $this->cc_number)) {
			$this->cc_type = 'Discover';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_DISCOVERNOVUS) != 'true')
				return -8;
		}
		elseif (preg_match('/^(3[0-9]{4}|2131|1800)[0-9]{11}$/', $this->cc_number)) {
			$this->cc_type = 'JCB';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_JCB) != 'true')
				return -8;
		}
		elseif (preg_match('/^5610[0-9]{12}$/', $this->cc_number)) {
			$this->cc_type = 'Australian BankCard';
			if (strtolower(MODULE_PAYMENT_CC_ACCEPT_OZBANKCARD) != 'true')
				return -8;
		} else {
			return -1;
		}

		if (is_numeric($expiry_m) && ($expiry_m > 0) && ($expiry_m < 13)) {
			$this->cc_expiry_month = $expiry_m;
		} else {
			return -2;
		}

		$current_year = date('Y');
		$expiry_y = substr($current_year, 0, 2).$expiry_y;
		if (is_numeric($expiry_y) && ($expiry_y >= $current_year) && ($expiry_y <= ($current_year +10))) {
			$this->cc_expiry_year = $expiry_y;
		} else {
			return -3;
		}

		if ($expiry_y == $current_year) {
			if ($expiry_m < date('n')) {
				return -4;
			}
		}

		return $this->is_valid();
	}

	function is_valid() {
		$cardNumber = strrev($this->cc_number);
		$numSum = 0;

		for ($i = 0; $i < strlen($cardNumber); $i ++) {
			$currentNum = substr($cardNumber, $i, 1);

			// Double every second digit
			if ($i % 2 == 1) {
				$currentNum *= 2;
			}

			// Add digits of 2-digit numbers together
			if ($currentNum > 9) {
				$firstNum = $currentNum % 10;
				$secondNum = ($currentNum - $firstNum) / 10;
				$currentNum = $firstNum + $secondNum;
			}

			$numSum += $currentNum;
		}

		// If the total has no remainder it's OK
		return ($numSum % 10 == 0);
	}
}