/*
* jQuery creditcard2 extension for the jQuery Validation plugin (http://plugins.jquery.com/project/validate).
* Ported from http://www.braemoor.co.uk/software/creditcard.shtml by John Gardner, with some enhancements.
*
* Author: Jack Killpatrick
* Copyright (c) 2008 iHwy, Inc.
*
* Version 1.0.0 (11/17/2008)
* Tested with jquery 1.2.6, but will probably work with earlier versions.
*
* History:
* 1.0.0 - released 2008-11-17
*
* Visit http://www.ihwy.com/labs/jquery-validate-credit-card-extension.aspx for usage information
*
* Dual licensed under the MIT and GPL licenses:
*   http://www.opensource.org/licenses/mit-license.php
*   http://www.gnu.org/licenses/gpl.html
*/

jQuery.validator.addMethod("creditcard2", function(value, element, param) {
    var cardName = param;

    var cards = new Array();
    cards[0] = { cardName: "Visa", lengths: "13,16", prefixes: "4", checkdigit: true };
    cards[1] = { cardName: "MasterCard", lengths: "16", prefixes: "51,52,53,54,55", checkdigit: true };
    cards[2] = { cardName: "Diners Club", lengths: "14,16", prefixes: "300,301,302,303,304,305,36,38,55", checkdigit: true };
    cards[3] = { cardName: "CarteBlanche", lengths: "14", prefixes: "300,301,302,303,304,305,36,38", checkdigit: true };
    cards[4] = { cardName: "American Express", lengths: "15", prefixes: "34,37", checkdigit: true };
    cards[5] = { cardName: "Discover", lengths: "16", prefixes: "6011,650", checkdigit: true };
    cards[6] = { cardName: "JCB", lengths: "15,16", prefixes: "3,1800,2131", checkdigit: true };
    cards[7] = { cardName: "enRoute", lengths: "15", prefixes: "2014,2149", checkdigit: true };
    cards[8] = { cardName: "Solo", lengths: "16,18,19", prefixes: "6334, 6767", checkdigit: true };
    cards[9] = { cardName: "Switch", lengths: "16,18,19", prefixes: "4903,4905,4911,4936,564182,633110,6333,6759", checkdigit: true };
    cards[10] = { cardName: "Maestro", lengths: "16,18", prefixes: "5020,6", checkdigit: true };
    cards[11] = { cardName: "VisaElectron", lengths: "16", prefixes: "417500,4917,4913", checkdigit: true };

    var cardType = -1;
    for (var i = 0; i < cards.length; i++) {
        if (cardName.toLowerCase() == cards[i].cardName.toLowerCase()) {
            cardType = i;
            break;
        }
    }
    if (cardType == -1) { return false; } // card type not found

    value = value.replace(/[\s-]/g, ""); // remove spaces and dashes
    if (value.length == 0) { return false; } // no length

    var cardNo = value;
    var cardexp = /^[0-9]{13,19}$/;
    if (!cardexp.exec(cardNo)) { return false; } // has chars or wrong length

    cardNo = cardNo.replace(/\D/g, ""); // strip down to digits

    if (cards[cardType].checkdigit) {
        var checksum = 0;
        var mychar = "";
        var j = 1;

        var calc;
        for (i = cardNo.length - 1; i >= 0; i--) {
            calc = Number(cardNo.charAt(i)) * j;
            if (calc > 9) {
                checksum = checksum + 1;
                calc = calc - 10;
            }
            checksum = checksum + calc;
            if (j == 1) { j = 2 } else { j = 1 };
        }

        if (checksum % 10 != 0) { return false; } // not mod10
    }

    var lengthValid = false;
    var prefixValid = false;
    var prefix = new Array();
    var lengths = new Array();

    prefix = cards[cardType].prefixes.split(",");
    for (i = 0; i < prefix.length; i++) {
        var exp = new RegExp("^" + prefix[i]);
        if (exp.test(cardNo)) prefixValid = true;
    }
    if (!prefixValid) { return false; } // invalid prefix

    lengths = cards[cardType].lengths.split(",");
    for (j = 0; j < lengths.length; j++) {
        if (cardNo.length == lengths[j]) lengthValid = true;
    }
    if (!lengthValid) { return false; } // wrong length

    return true;
}, jQuery.validator.messages.creditcard);