var flyingSpeed = 25;
var url_addProductToBasket = 'http://www.educat.az/addProduct.php';
var url_removeProductFromBasket = '';
var txt_totalPrice = '';
var shopping_cart_div = false;
var flyingDiv = false;
var currentProductDiv = false;
var shopping_cart_x = false;
var shopping_cart_y = false;
var slide_xFactor = false;
var slide_yFactor = false;
var diffX = false;
var diffY = false;
var currentXPos = false;
var currentYPos = false;
var ajaxObjects = new Array();

function shoppingCart_getTopPos(inputObj)
{
  var returnValue = inputObj.offsetTop;
  while((inputObj = inputObj.offsetParent) != null){
  	if(inputObj.tagName!='HTML')returnValue += inputObj.offsetTop;
  }
  return returnValue;
}

function shoppingCart_getLeftPos(inputObj)
{
  var returnValue = inputObj.offsetLeft;
  while((inputObj = inputObj.offsetParent) != null){
  	if(inputObj.tagName!='HTML')returnValue += inputObj.offsetLeft;
  }
  return returnValue;
}


function addToBasket(productId)
{
	if(!shopping_cart_div)shopping_cart_div = document.getElementById('shopping_cart');
	if(!flyingDiv){
		flyingDiv = document.createElement('DIV');
		flyingDiv.style.position = 'absolute';
		document.body.appendChild(flyingDiv);
	}

	shopping_cart_x = shoppingCart_getLeftPos(shopping_cart_div);
	shopping_cart_y = shoppingCart_getTopPos(shopping_cart_div);

	currentProductDiv = document.getElementById('slidingProduct' + productId);

	currentXPos = shoppingCart_getLeftPos(currentProductDiv);
	currentYPos = shoppingCart_getTopPos(currentProductDiv);

	diffX = shopping_cart_x - currentXPos;
	diffY = shopping_cart_y - currentYPos;

	var shoppingContentCopy = currentProductDiv.cloneNode(true);
	shoppingContentCopy.id='';
	flyingDiv.innerHTML = '';
	flyingDiv.style.left = currentXPos + 'px';
	flyingDiv.style.top = currentYPos + 'px';
	flyingDiv.appendChild(shoppingContentCopy);
	flyingDiv.style.display='block';
	flyingDiv.style.width = currentProductDiv.offsetWidth + 'px';
	flyToBasket(productId);

}


function flyToBasket(productId)
{
	var maxDiff = Math.max(Math.abs(diffX),Math.abs(diffY));
	var moveX = (diffX / maxDiff) * flyingSpeed;;
	var moveY = (diffY / maxDiff) * flyingSpeed;

	currentXPos = currentXPos + moveX;
	currentYPos = currentYPos + moveY;

	flyingDiv.style.left = Math.round(currentXPos) + 'px';
	flyingDiv.style.top = Math.round(currentYPos) + 'px';


	if(moveX>0 && currentXPos > shopping_cart_x){
		flyingDiv.style.display='none';
	}
	if(moveX<0 && currentXPos < shopping_cart_x){
		flyingDiv.style.display='none';
	}

	if(flyingDiv.style.display=='block')setTimeout('flyToBasket("' + productId + '")',10); else ajaxAddProduct(productId);
}

function showAjaxBasketContent(ajaxIndex, prid) {

	var itemBox = document.getElementById('shopping_cart_items');
	var productItems = ajaxObjects[ajaxIndex].response.split('|||');

	if(document.getElementById('shopping_cart_items_product' + productItems[0])){
		var row = document.getElementById('shopping_cart_items_product' + productItems[0]);
		var items = row.cells[0].innerHTML /1;
		items = items + 1;
	} else {
		var tr = itemBox.insertRow(-1);
		tr.id = 'shopping_cart_items_product' + productItems[0]
		var td = tr.insertCell(-1);
		td.innerHTML = '';
	}

	var cart_num = document.getElementById('cart_num');
	var tnum = cart_num.innerHTML;
	var basketIconElm = document.getElementById('basketIcon' + prid);
	basketIconElm.innerHTML = '<img src="http://www.educat.az/images/accept.gif" width="13" height="13" alt="" />';
	cart_num.innerHTML = parseInt(itemBox.rows.length-1)+parseInt(tnum);
	ajaxObjects[ajaxIndex] = false;
}


function updateTotalPrice()
{
	var itemBox = document.getElementById('shopping_cart_items');
	var totalPrice = 0;
	if(document.getElementById('shopping_cart_totalprice')){
		for(var no=1;no<itemBox.rows.length;no++){
			totalPrice = totalPrice + (itemBox.rows[no].cells[0].innerHTML.replace(/[^0-9]/g) * itemBox.rows[no].cells[2].innerHTML);
		}
		document.getElementById('shopping_cart_totalprice').innerHTML = txt_totalPrice + totalPrice.toFixed(2);
	}
}

function removeProductFromBasket(productId)
{
	var productRow = document.getElementById('shopping_cart_items_product' + productId);

	var numberOfItemCell = productRow.cells[0];
	if(numberOfItemCell.innerHTML == '1'){
		productRow.parentNode.removeChild(productRow);
	}else{
		numberOfItemCell.innerHTML = numberOfItemCell.innerHTML/1 - 1;
	}
	ajaxRemoveProduct(productId);
}

function ajaxValidateRemovedProduct(ajaxIndex)
{
	if(ajaxObjects[ajaxIndex].response!='OK')alert('Error while removing product from the database');

}

function ajaxRemoveProduct(productId)
{
	var ajaxIndex = ajaxObjects.length;
	ajaxObjects[ajaxIndex] = new sack();
	ajaxObjects[ajaxIndex].requestFile = url_removeProductFromBasket;
	ajaxObjects[ajaxIndex].setVar('productIdToRemove',productId);
	ajaxObjects[ajaxIndex].onCompletion = function(){ ajaxValidateRemovedProduct(ajaxIndex); };
	ajaxObjects[ajaxIndex].runAJAX();
}

function ajaxAddProduct(productId)
{
	var ajaxIndex = ajaxObjects.length;
	ajaxObjects[ajaxIndex] = new sack();
	ajaxObjects[ajaxIndex].requestFile = url_addProductToBasket;
	ajaxObjects[ajaxIndex].setVar('productId',productId);
	ajaxObjects[ajaxIndex].onCompletion = function(){ showAjaxBasketContent(ajaxIndex, productId); };
	ajaxObjects[ajaxIndex].runAJAX();
}