//variables:
var name="orderInfo"; //cookie name
var number=560; //number of products
qty = new Array(number); //quantities of each product
var qtyString = "";
//
for (var i = 0 ; i < number ; i++)
  qty [i] = 0;
initialize();
qtyString = getCookie(name);
extractorder(qtyString, number);
//
function getCookieVal (offset) {
  var endstr = document.cookie.indexOf (";", offset);
  if (endstr == -1)
    endstr = document.cookie.length;
  return unescape(document.cookie.substring(offset, endstr));
}
//
function getCookie(name) {
  var arg = name + "=";
  var alen = arg.length;
  var clen = document.cookie.length;
  var i = 0;
  while (i < clen) {
    var j = i + alen;
    if (document.cookie.substring(i, j) == arg)
      return getCookieVal(j);
    i = document.cookie.indexOf(" ", i) + 1;
    if (i == 0) break;
  }
  return null;
}
//
function setCookie (name, value) {
  var argv = setCookie.arguments;
  var argc = setCookie.arguments.length;
  var expires = (argc > 2) ? argv[2] : null;
  var path = (argc > 3) ? argv[3] : null;
  var domain = (argc > 4) ? argv[4] : null;
  var secure = (argc > 5) ? argv[5] : false;
  document.cookie = name + "=" + escape (value) + "," +
    ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
    ((path == null) ? "" : ("; path=" + path)) +
    ((domain == null) ? "" : ("; domain=" + domain)) +
    ((secure == true) ? "; secure" : "");
}
//
function deleteCookie (name) {
  var exp = new Date();
  exp.setTime (exp.getTime() - 1);  // This cookie is history
  var cval = getCookie(name);
  document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}
//
function initialize() {
  if (getCookie(name) == null) {
    var expiryDate = new Date();
    expiryDate.setTime(expiryDate.getTime() + (12 * 60 * 60 * 1000));
    setCookie(name,qty.join(),expiryDate,"/");
  }
}
//
function extractorder(qtyString,number) {
  var first = 0;
  var last = 0;
  for (var i = 0; i < number; i ++) {
    first = (i == 0) ? 0 : last+1;
    last = qtyString.indexOf(",",first);
    qty[i] = parseInt(qtyString.substring(first,last));
  }
}
//
function updateorderInfo(item, newQty) {
  qty[item] = newQty;
  setCookie(name, qty.join());
}
//
function displayQty(formNum) {
  var myForm=document.forms[formNum];
  var itemNum=myForm.prod.value;
  myForm.basketQty.value = qty[itemNum];
}
//
function addQty(formNum) {
  var ckNum=0;
  var myForm=document.forms[formNum];
  var itemNum=myForm.prod.value;
  var newQty = myForm.amt.value;
  ckNum = parseInt(newQty);
  if (ckNum==newQty) {
    qty[itemNum] += ckNum;
  }
  qty[itemNum] = (qty[itemNum] < 0) ? 0 : qty[itemNum]; 
  displayQty(formNum);
  myForm.amt.value=1;
  setCookie(name,qty.join());
}
function deductQty(formNum) {
  var ckNum=0;
  var myForm=document.forms[formNum];
  var itemNum=myForm.prod.value;
  var newQty = myForm.amt.value;
  ckNum = parseInt(newQty);
  if (ckNum==newQty) {
    qty[itemNum] -= ckNum;
  }
  qty[itemNum] = (qty[itemNum] < 0) ? 0 : qty[itemNum]; 
  displayQty(formNum);
  myForm.amt.value=1;
  setCookie(name,qty.join());
}
//
function deductQtyBis(formNum) {
  var ckNum=0;
  var myForm=document.forms[formNum];
  var itemNum=myForm.prod.value;
  var newQty = myForm.amt.value;
  var newQtyDeduct=myForm.basketQty.value;
  
  //Quiero deducir la cantidad que esta en el carrito.
  //ckNum = parseInt(newQty);
  //if (ckNum==newQty) {
  //  qty[itemNum] -= ckNum;
  //}
  qty[itemNum]="0"; //Y se acabo!!
  qty[itemNum] = (qty[itemNum] < 0) ? 0 : qty[itemNum]; 
  displayQty(formNum);
  myForm.amt.value=1;
  setCookie(name,qty.join());
}
//
function cambioCheck(formNum){
		var chkNum=0;
		var myForm=document.forms[formNum];
		var itemNum=myForm.prod.value;
		var newQty=myForm.amt.value;
		var valorDeCheckBox;
		
		if (myForm.checkbox.checked)
		{
			valorDeCheckBox="1";
			addQty(formNum);
		}
		else
		{
			valorDeCheckBox="2";
			deductQtyBis(formNum);
		}
}
//
//Cuando recargo un checkBox tengo que actualizar el estado
function chkLoad(formNum){
		var chkNum=0;
		var myForm=document.forms[formNum];
		var itemNum=myForm.prod.value;
		var newQty=myForm.amt.value;
		var valorDeCheckBox;
		
		if (qty[itemNum] !="0")
		{
			myForm.checkbox.checked=true;
		}
		else
		{
		    myForm.chekbox.checked=false;
		}
}
// Todos los checkbox ...
function eventoOnLoad()
{
	var itemNum;
	for (var i=0 ; i<number ; i++)
	{
    	myForm = document.forms[i];
		if (myForm == null)
			break;
		itemNum = myForm.prod.value;
		if (qty[itemNum] != "0")
		{
			myForm.checkbox.checked=true;
		}
		else
		{
			myForm.checkbox.checked=false;
		}
  	}
}