/*************************************************************************\
CheckCardNumber(form)
function called when users click the "check" button.
\*************************************************************************/
function CheckCardNumber() 
{
        // if credit card method is not checked, validation is not required.
        if (false == $('p_method_bpag').checked) {
                return true;
        }

	var tmpyear;
	
//	if ($('bpag_cc_number').value.length == 0) 
//	{
//		alert("Please enter a Card Number.");
//		$('bpag_cc_number').focus();
//		return;
//	}

	
        // valida quantidade de caracteres no código verificador.
        if ($('bpag_cc_cid').value.length > 4)
	{
		alert("Código verificador inválido. Por favor, verifique.");
		$('bpag_cc_cid').focus();
		$('bpag_cc_cid').select();
		return;
	}


	
//	if ($('bpag_expiration_yr').value.length == 0) 
//	{
//		alert("Please enter the Expiration Year.");
//		$('bpag_expiration_yr').focus();
//		return;
//	}
	
//	if ($('bpag_expiration_yr').value.length == 0)
//	{	
//		return;
//	}
//	else
//	{
		tmpyear = $('bpag_expiration_yr').value;	
//	}
	
	tmpmonth = $('bpag_expiration').options[$('bpag_expiration').selectedIndex].value;
	// The following line doesn't work in IE3, you need to change it
	// to something like "(new CardType())...".
	// if (!CardType().isExpiryDate(tmpyear, tmpmonth)) {

        // validate just if credit card radio is checked
        if ($('p_method_bpag').checked) {
            if (!(new CardType()).isExpiryDate(tmpyear, tmpmonth))
            {
                    $('mensagem_bandeira').className = 'validation-advice';
                    $('mensagem_bandeira').innerHTML  = 'Por favor verifique a data de expiração do cartão.';
                    return false;
            }
	}
	
	var x = 0;
	while( $('bpag_bpag_method_credito['+x+']') )
	{
		if( $('bpag_bpag_method_credito['+x+']').checked )
		{
			cardname = $('bpag_bpag_method_credito['+x+']').value;

			if( cardname == 'moset' )
			{
				card = 'VisaCard';
			}	
			else
			if( cardname == 'redecard_ws_mastercard' )
			{
				card = 'MasterCard';
			}
			else
			if( cardname == 'amex_webpos2p' )
			{
				card = 'AmExCard';
			}
			else
			if( cardname == 'redecard_ws_diners' )
			{
				card = 'DinersClubCard';		
			}
			else
			{
				return true;
			}
			break;
		}		
		x++;
	}

        
        
        

        var retval = eval(card + ".checkCardNumber(\"" + $('bpag_cc_number').value +"\", " + tmpyear + ", " + tmpmonth + ");");
        cardname = "";

        

	if (retval)
	{
		// comment this out if used on an order form
		//alert("This card number appears to be valid.");
		$('mensagem_bandeira').className = '';
		$('mensagem_bandeira').innerHTML  = '';		
		return true;
	}
	else {
		// The cardnumber has the valid luhn checksum, but we want to know which
		// cardtype it belongs to.
		for (var n = 0; n < Cards.size; n++) {
			if (Cards[n].checkCardNumber($('bpag_cc_number').value, tmpyear, tmpmonth)) {
				cardname = Cards[n].getCardType();
				break;
   			}
		}

		if (cardname.length > 0) 
		{
//			alert("Bandeira do cartão incorreta!");
			$('mensagem_bandeira').className = 'validation-advice';
			$('mensagem_bandeira').innerHTML  = 'A bandeira selecionada não corresponde ao número digitado.';
			return false;
			//alert("This looks like a " + cardname + " number, not a " + card + " number.");
		}
		else {
//			alert("Este cartão é inválido");
			$('mensagem_bandeira').className = 'validation-advice';
			$('mensagem_bandeira').innerHTML = 'A bandeira selecionada não corresponde ao número digitado.';
			return false;
                }
	}
        return true;


}
	
/*************************************************************************\
Object CardType([String cardtype, String rules, String len, int year, 
                                        int month])
cardtype    : type of card, eg: MasterCard, Visa, etc.
rules       : rules of the cardnumber, eg: "4", "6011", "34,37".
len         : valid length of cardnumber, eg: "16,19", "13,16".
year        : year of expiry date.
month       : month of expiry date.
eg:
var VisaCard = new CardType("Visa", "4", "16");
var AmExCard = new CardType("AmEx", "34,37", "15");
\*************************************************************************/
function CardType() 
{
	var n;
	var argv = CardType.arguments;
	var argc = CardType.arguments.length;
	
	this.objname = "object CardType";
	
	var tmpcardtype = (argc > 0) ? argv[0] : "CardObject";
	var tmprules = (argc > 1) ? argv[1] : "0,1,2,3,4,5,6,7,8,9";
	var tmplen = (argc > 2) ? argv[2] : "13,14,15,16,19";
	
	this.setCardNumber = setCardNumber;  // set CardNumber method.
	this.setCardType = setCardType;  // setCardType method.
	this.setLen = setLen;  // setLen method.
	this.setRules = setRules;  // setRules method.
	this.setExpiryDate = setExpiryDate;  // setExpiryDate method.
	
	this.setCardType(tmpcardtype);
	this.setLen(tmplen);
	this.setRules(tmprules);
	
	if (argc > 4)
		this.setExpiryDate(argv[3], argv[4]);

	this.checkCardNumber = checkCardNumber;  // checkCardNumber method.
	this.getExpiryDate = getExpiryDate;  // getExpiryDate method.
	this.getCardType = getCardType;  // getCardType method.
	this.isCardNumber = isCardNumber;  // isCardNumber method.
	this.isExpiryDate = isExpiryDate;  // isExpiryDate method.
	this.luhnCheck = luhnCheck;// luhnCheck method.
	return this;
}

/*************************************************************************\
boolean checkCardNumber([String cardnumber, int year, int month])
return true if cardnumber pass the luhncheck and the expiry date is
valid, else return false.
\*************************************************************************/
function checkCardNumber() 
{
	var argv = checkCardNumber.arguments;
	var argc = checkCardNumber.arguments.length;
	var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
	var year = (argc > 1) ? argv[1] : this.year;
	var month = (argc > 2) ? argv[2] : this.month;
	
	this.setCardNumber(cardnumber);
	this.setExpiryDate(year, month);

	if (!this.isCardNumber())
		return false;
	
	if (!this.isExpiryDate())
		return false;

	return true;
}

/*************************************************************************\
String getCardType()
return the cardtype.
\*************************************************************************/
function getCardType() 
{
	return this.cardtype;
}

/*************************************************************************\
String getExpiryDate()
return the expiry date.
\*************************************************************************/
function getExpiryDate() 
{
	return this.month + "/" + this.year;
}

/*************************************************************************\
boolean isCardNumber([String cardnumber])
return true if cardnumber pass the luhncheck and the rules, else return
false.
\*************************************************************************/
function isCardNumber() {
var argv = isCardNumber.arguments;
var argc = isCardNumber.arguments.length;
var cardnumber = (argc > 0) ? argv[0] : this.cardnumber;
if (!this.luhnCheck())
return false;

for (var n = 0; n < this.len.size; n++)
if (cardnumber.toString().length == this.len[n]) {
for (var m = 0; m < this.rules.size; m++) {
var headdigit = cardnumber.substring(0, this.rules[m].toString().length);
if (headdigit == this.rules[m])
return true;
}
return false;
}
return false;
}

/*************************************************************************\
boolean isExpiryDate([int year, int month])
return true if the date is a valid expiry date,
else return false.
\*************************************************************************/
function isExpiryDate() {
var argv = isExpiryDate.arguments;
var argc = isExpiryDate.arguments.length;

year = argc > 0 ? argv[0] : this.year;
month = argc > 1 ? argv[1] : this.month;

if (!isNum(year+""))
return false;
if (!isNum(month+""))
return false;
today = new Date();
expiry = new Date(year, month);
if (today.getTime() > expiry.getTime())
return false;
else
return true;
}

/*************************************************************************\
boolean isNum(String argvalue)
return true if argvalue contains only numeric characters,
else return false.
\*************************************************************************/
function isNum(argvalue) {
argvalue = argvalue.toString();

if (argvalue.length == 0)
return false;

for (var n = 0; n < argvalue.length; n++)
if (argvalue.substring(n, n+1) < "0" || argvalue.substring(n, n+1) > "9")
return false;

return true;
}

/*************************************************************************\
boolean luhnCheck([String CardNumber])
return true if CardNumber pass the luhn check else return false.
Reference: http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl
\*************************************************************************/
function luhnCheck() {
var argv = luhnCheck.arguments;
var argc = luhnCheck.arguments.length;

var CardNumber = argc > 0 ? argv[0] : this.cardnumber;

if (! isNum(CardNumber)) {
return false;
  }

var no_digit = CardNumber.length;
var oddoeven = no_digit & 1;
var sum = 0;

for (var count = 0; count < no_digit; count++) {
var digit = parseInt(CardNumber.charAt(count));
if (!((count & 1) ^ oddoeven)) {
digit *= 2;
if (digit > 9)
digit -= 9;
}
sum += digit;
}
if (sum % 10 == 0)
return true;
else
return false;
}

/*************************************************************************\
ArrayObject makeArray(int size)
return the array object in the size specified.
\*************************************************************************/
function makeArray(size) {
this.size = size;
return this;
}

/*************************************************************************\
CardType setCardNumber(cardnumber)
return the CardType object.
\*************************************************************************/
function setCardNumber(cardnumber) {
this.cardnumber = cardnumber;
return this;
}

/*************************************************************************\
CardType setCardType(cardtype)
return the CardType object.
\*************************************************************************/
function setCardType(cardtype) {
this.cardtype = cardtype;
return this;
}

/*************************************************************************\
CardType setExpiryDate(year, month)
return the CardType object.
\*************************************************************************/
function setExpiryDate(year, month) {
this.year = year;
this.month = month;
return this;
}

/*************************************************************************\
CardType setLen(len)
return the CardType object.
\*************************************************************************/
function setLen(len) {
// Create the len array.
if (len.length == 0 || len == null)
len = "13,14,15,16,19";

var tmplen = len;
n = 1;
while (tmplen.indexOf(",") != -1) {
tmplen = tmplen.substring(tmplen.indexOf(",") + 1, tmplen.length);
n++;
}
this.len = new makeArray(n);
n = 0;
while (len.indexOf(",") != -1) {
var tmpstr = len.substring(0, len.indexOf(","));
this.len[n] = tmpstr;
len = len.substring(len.indexOf(",") + 1, len.length);
n++;
}
this.len[n] = len;
return this;
}

/*************************************************************************\
CardType setRules()
return the CardType object.
\*************************************************************************/
function setRules(rules) {
// Create the rules array.
if (rules.length == 0 || rules == null)
rules = "0,1,2,3,4,5,6,7,8,9";
  
var tmprules = rules;
n = 1;
while (tmprules.indexOf(",") != -1) {
tmprules = tmprules.substring(tmprules.indexOf(",") + 1, tmprules.length);
n++;
}
this.rules = new makeArray(n);
n = 0;
while (rules.indexOf(",") != -1) {
var tmpstr = rules.substring(0, rules.indexOf(","));
this.rules[n] = tmpstr;
rules = rules.substring(rules.indexOf(",") + 1, rules.length);
n++;
}
this.rules[n] = rules;
return this;
}