/**
 * IBAN is the international bank account number.
 * It has a country - specific format, that is checked here too
 */
jQuery.validator.addMethod("iban", function(value, element) {
	// some quick simple tests to prevent needless work
	if (this.optional(element)) {
		return true;
	}
	if (!(/^([a-zA-Z0-9]{4} ){2,8}[a-zA-Z0-9]{1,4}|[a-zA-Z0-9]{12,34}$/.test(value))) {
		return false;
	}

	// check the country code and find the country specific format
	var iban = value.replace(/ /g,'').toUpperCase(); // remove spaces and to upper case
	var countrycode = iban.substring(0,2);
	var bbancountrypatterns = {
		'AL': "\\d{8}[\\dA-Z]{16}",
		'AD': "\\d{8}[\\dA-Z]{12}",
		'AT': "\\d{16}",
		'AZ': "[\\dA-Z]{4}\\d{20}",
		'BE': "\\d{12}",
		'BH': "[A-Z]{4}[\\dA-Z]{14}",
		'BA': "\\d{16}",
		'BR': "\\d{23}[A-Z][\\dA-Z]",
		'BG': "[A-Z]{4}\\d{6}[\\dA-Z]{8}",
		'CR': "\\d{17}",
		'HR': "\\d{17}",
		'CY': "\\d{8}[\\dA-Z]{16}",
		'CZ': "\\d{20}",
		'DK': "\\d{14}",
		'DO': "[A-Z]{4}\\d{20}",
		'EE': "\\d{16}",
		'FO': "\\d{14}",
		'FI': "\\d{14}",
		'FR': "\\d{10}[\\dA-Z]{11}\\d{2}",
		'GE': "[\\dA-Z]{2}\\d{16}",
		'DE': "\\d{18}",
		'GI': "[A-Z]{4}[\\dA-Z]{15}",
		'GR': "\\d{7}[\\dA-Z]{16}",
		'GL': "\\d{14}",
		'GT': "[\\dA-Z]{4}[\\dA-Z]{20}",
		'HU': "\\d{24}",
		'IS': "\\d{22}",
		'IE': "[\\dA-Z]{4}\\d{14}",
		'IL': "\\d{19}",
		'IT': "[A-Z]\\d{10}[\\dA-Z]{12}",
		'KZ': "\\d{3}[\\dA-Z]{13}",
		'KW': "[A-Z]{4}[\\dA-Z]{22}",
		'LV': "[A-Z]{4}[\\dA-Z]{13}",
		'LB': "\\d{4}[\\dA-Z]{20}",
		'LI': "\\d{5}[\\dA-Z]{12}",
		'LT': "\\d{16}",
		'LU': "\\d{3}[\\dA-Z]{13}",
		'MK': "\\d{3}[\\dA-Z]{10}\\d{2}",
		'MT': "[A-Z]{4}\\d{5}[\\dA-Z]{18}",
		'MR': "\\d{23}",
		'MU': "[A-Z]{4}\\d{19}[A-Z]{3}",
		'MC': "\\d{10}[\\dA-Z]{11}\\d{2}",
		'MD': "[\\dA-Z]{2}\\d{18}",
		'ME': "\\d{18}",
		'NL': "[A-Z]{4}\\d{10}",
		'NO': "\\d{11}",
		'PK': "[\\dA-Z]{4}\\d{16}",
		'PS': "[\\dA-Z]{4}\\d{21}",
		'PL': "\\d{24}",
		'PT': "\\d{21}",
		'RO': "[A-Z]{4}[\\dA-Z]{16}",
		'SM': "[A-Z]\\d{10}[\\dA-Z]{12}",
		'SA': "\\d{2}[\\dA-Z]{18}",
		'RS': "\\d{18}",
		'SK': "\\d{20}",
		'SI': "\\d{15}",
		'ES': "\\d{20}",
		'SE': "\\d{20}",
		'CH': "\\d{5}[\\dA-Z]{12}",
		'TN': "\\d{20}",
		'TR': "\\d{5}[\\dA-Z]{17}",
		'AE': "\\d{3}\\d{16}",
		'GB': "[A-Z]{4}\\d{14}",
		'VG': "[\\dA-Z]{4}\\d{16}"
	};
	var bbanpattern = bbancountrypatterns[countrycode];
	// As new countries will start using IBAN in the
	// future, we only check if the countrycode is known.
	// This prevents false negatives, while almost all
	// false positives introduced by this, will be caught
	// by the checksum validation below anyway.
	// Strict checking should return FALSE for unknown
	// countries.
	if (typeof bbanpattern !== 'undefined') {
		var ibanregexp = new RegExp("^[A-Z]{2}\\d{2}" + bbanpattern + "$", "");
		if (!(ibanregexp.test(iban))) {
			return false; // invalid country specific format
		}
	}

	// now check the checksum, first convert to digits
	var ibancheck = iban.substring(4,iban.length) + iban.substring(0,4);
	var ibancheckdigits = "";
	var leadingZeroes = true;
	var charAt;
	for (var i =0; i<ibancheck.length; i++) {
		charAt = ibancheck.charAt(i);
		if (charAt !== "0") {
			leadingZeroes = false;
		}
		if (!leadingZeroes) {
			ibancheckdigits += "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".indexOf(charAt);
		}
	}

	// calculate the result of: ibancheckdigits % 97
    var cRest = '';
    var cOperator = '';
	for (var p=0; p<ibancheckdigits.length; p++) {
		var cChar = ibancheckdigits.charAt(p);
		cOperator = '' + cRest + '' + cChar;
		cRest = cOperator % 97;
    }
	return cRest === 1;
}, "Please specify a valid IBAN");