/****************************************************************************
Copyright (c) 2009 The Wojo Group

thewojogroup.com
simplecartjs.com
http://github.com/thewojogroup/simplecart-js/tree/master

The MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/

var NextId=1,Custom="Custom",GoogleCheckout="GoogleCheckout",PayPal="PayPal",Email="Email",AustralianDollar=AUD="AUD",CanadianDollar=CAD="CAD",CzechKoruna=CZK="CZK",DanishKrone=DKK="DKK",Euro=EUR="EUR",HongKongDollar=HKD="HKD",HungarianForint=HUF="HUF",IsraeliNewSheqel=ILS="ILS",JapaneseYen=JPY="JPY",MexicanPeso=MXN="MXN",NorwegianKrone=NOK="NOK",NewZealandDollar=NZD="NZD",PolishZloty=PLN="PLN",PoundSterling=GBP="GBP",SingaporeDollar=SGD="SGD",SwedishKrona=SEK="SEK",SwissFranc=CHF="CHF",USDollar=USD="USD";
function Cart(){

	var me = this;
	/* member variables */
	me.Version = '2.0.1';
	me.Shelf = new Shelf();
	me.items = {};
	me.isLoaded = false;
	me.pageIsReady = false;
	me.quantity = 0;
	me.total = 0;
	me.taxRate = 0;
	me.taxCost = 0;
	me.shippingFlatRate = 0;
	me.shippingTotalRate = 0;
	me.shippingQuantityRate = 0;
	me.shippingRate = 0;
	me.shippingCost = 0;
	me.currency = CAD;
	me.checkoutTo = Email;
	me.email = "";
	me.merchantId	 = "";
	me.cartHeaders = ['Remove','Thumb_image','Name','Price','Quantity_input','increment','decrement','Total'];
	/* 
		cart headers: 
		you can set these to which ever order you would like, and the cart will display the appropriate headers
		and item info.  any field you have for the items in the cart can be used, and 'Total' will automatically 
		be price*quantity.  
		
		there are keywords that can be used:
			
			1) "_input" - the field will be a text input with the value set to the given field. when the user
				changes the value, it will update the cart.  this can be useful for quantity. (ie "Quantity_input")
			
			2) "increment" - a link with "+" that will increase the item quantity by 1
			
			3) "decrement" - a link with "-" that will decrease the item quantity by 1
			
			4) "remove" - a link that will remove the item from the cart 
			
			5) "_image" or "Image" - the field will be an img tag with the src set to the value. You can simply use "Image" if
				you set a field in the items called "Image".  If you have a field named something else, like "Thumb", you can add
				the "_image" to create the image tag (ie "Thumb_image").
				
			6) "_noHeader" - this will skip the header for that field (ie "increment_noHeader")
		
	
	*/
	
	


	/******************************************************
			add/remove items to cart  
 	 ******************************************************/

	me.add = function () {
		var me=this;
		/* load cart values if not already loaded */
		if( !me.pageIsReady 	) { 
			me.initializeView(); 
			me.update();	
		}
		if( !me.isLoaded 		) { 
			me.load(); 
			me.update();	
		}
		
		var newItem = new CartItem();
		
		/* check to ensure arguments have been passed in */
		if( !arguments || arguments.length === 0 ){
			error( 'No values passed for item.');
			return;
		}
		var argumentArray = arguments;
		if( arguments[0] && typeof( arguments[0] ) != 'string' && typeof( arguments[0] ) != 'number'  ){ 
			argumentArray = arguments[0]; 
		} 
	
		newItem.parseValuesFromArray( argumentArray );
		newItem.checkQuantityAndPrice();
		
		/* if the item already exists, update the quantity */
		if( me.hasItem(newItem) ) {
			var id=me.hasItem(newItem);
			me.items[id].quantity= parseInt(me.items[id].quantity,10) + parseInt(newItem.quantity,10);
		} else {
			me.items[newItem.id] = newItem;
		}	
		
		me.update();
		location.href = "#cesta_compra.php"; //Tras añadir un elemento al carrito, redirigir a la página de visualización del carrito
	};
	
	//Eliminar un producto del carrito
	me.remove = function( id ){
		//Generar array temporal con las referencias de los elementos a eliminar. Inicializarlo con el elemento sobre el que se pulsó eliminar
		var itemsToDelete = new Array();
		//itemsToDelete.push(id);
		
		//Extraer la referencia del producto que va a ser eliminado
		var ref = me.items[id].name;
		ref = ref.substring(ref.indexOf("Ref. ") + 5);
		ref = ref.replace("</span>", "");
		//itemsToDelete.push(ref); //Guardar la primera referencia en el vector de elementos a eliminar
		
		//Cargar de forma asíncrona el script que controla las ofertas (para eliminar los productos asociados a la oferta a la vez)
		$.ajax({
			type: 'POST',
			cache: false,
			url: 'ofertaAsociada.php',
			data: "ref=" + ref, 
			success: function(msg){
				var tempArray = {};
				var i;
				var control = true;
				
				//Recoger los datos del servidor
				var pos = msg.indexOf("devolver : ") + 11;
				var devolver = msg.substring(pos, pos + 2);
				pos = msg.indexOf("segundaRef : ") + 13;
				var segundaRef = msg.substring(pos);
				
				//Controlar si se ha producido algún error
				if(devolver != "00"){
					alert("Error al eliminar el producto");
				}else{
					//Evaluar si hay oferta de tipo "regalo". En tal caso el producto que se regala deberá ser eliminado a la vez que el otro
					switch(segundaRef){
						case '' : break;
						case 'oferta1' :
							itemsToDelete.push(ref);
							break;
						case 'oferta2' : break;
						default :
							itemsToDelete.push(segundaRef);
					}
					
					//Eliminar los productos correspondientes
					for( var item in me.items ){
						//Comprobar si el elemento a evaluar es el producto que debe eliminarse
						if(me.items[item].name.indexOf(ref) != -1 && me.items[item].price > 0.00){control = false;}
						for(i = 0; i < itemsToDelete.length; i++){
							//Comparar las referencias de los elementos del carrito con las de los elementos a eliminar
							if( me.items[item].name.indexOf(itemsToDelete[i]) != -1 && me.items[item].price == 0.00){
								//Si algún elemento coincide, ese elemento del carrito deberá ser eliminado
								control = false;
							}
						}
						
						//Guardamos en un array temporal los elementos que no han de ser eliminados
						if(control == true) tempArray[item] = me.items[item];
						else control = true;
					}
					me.items = tempArray;
					simpleCart.update();
				}
			},
			error: function(){
				alert("Error al eliminar el producto");
			}
		});
	};
	
	me.empty = function () {
		simpleCart.items = {};
		simpleCart.update();
	};
	
	/******************************************************
			 item accessor functions
     ******************************************************/

	me.find = function (criteria) {
		if( !criteria )
			return null;
		var results = [];
		for( var next in me.items ){
			var item = me.items[next],
				fits = true;
			for( var name in criteria ){
				if( !item[name] || item[name] != criteria[name] )
					fits = false;
			}
			if( fits )
				results.push( me.next )
		}
		return (results.length == 0 ) ? null : results;
	}

	/******************************************************
			 checkout management 
     ******************************************************/

	me.checkout = function() {
		if( simpleCart.quantity === 0 ){
			error("Cart is empty");
			return;
		}
		switch( simpleCart.checkoutTo ){
			case PayPal:
				simpleCart.paypalCheckout();
				break;
			case GoogleCheckout:
				simpleCart.googleCheckout();
				break;
			case Email:
				simpleCart.emailCheckout();
				break;
			default:
				simpleCart.customCheckout();
				break;
		}
	};
	
	me.paypalCheckout = function() {
		
		var me = this,
			winpar = "scrollbars,location,resizable,status",
			strn  = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart" +
		   			"&upload=1" +
		        	"&business=" + me.email + 
					"&currency_code=" + me.currency,
			counter = 1,
			itemsString = "";
			
		
		if( me.taxRate ){
			strn = strn + 
				"&tax_cart=" +  me.currencyStringForPaypalCheckout( me.taxCost );
		}
		
		for( var current in me.items ){
			var item = me.items[current];
			
			var optionsString = "";
			for( var field in item ){
				if( typeof(item[field]) != "function" && field != "id" && field != "price" && field != "quantity" && field != "name" && field != "shipping") {
					optionsString = optionsString + ", " + field + "=" + item[field] ; 
				}
			}
			optionsString = optionsString.substring(2);
			
			itemsString = itemsString 	+ "&item_name_" 	+ counter + "=" + item.name  +
									 	  "&item_number_" 	+ counter + "=" + counter +
										  "&quantity_"		+ counter + "=" + item.quantity +
										  "&amount_"		+ counter + "=" + me.currencyStringForPaypalCheckout( item.price ) + 
										  "&on0_" 			+ counter + "=" + "Options" + 
										  "&os0_"			+ counter + "=" + optionsString;
			counter++;
		}
		
		if( me.shipping() != 0){
			 itemsString = itemsString 	+ "&item_name_" 	+ counter + "=Shipping"  +
									 	  "&item_number_" 	+ counter + "=" + counter +
										  "&quantity_"		+ counter + "=1" + 
										  "&amount_"		+ counter + "=" + me.currencyStringForPaypalCheckout( me.shippingCost );
		}
		
		
		strn = strn + itemsString ;
		window.open (strn, "paypal", winpar);
	};

	me.googleCheckout = function() {
		var me = this;
		if( me.currency != USD && me.currency != GBP ){
			error( "Google Checkout only allows the USD and GBP for currency.");
			return;
		} else if( me.merchantId === "" || me.merchantId === null || !me.merchantId ){
			error( "No merchant Id for google checkout supplied.");
			return;
		} 
		
		var form = document.createElement("form"),
			counter = 1;
		form.style.display = "none";
		form.method = "POST";
		form.action = "https://checkout.google.com/api/checkout/v2/checkoutForm/Merchant/" + 
						me.merchantId;
		form.acceptCharset = "utf-8";
		
		for( var current in me.items ){
			var item 				= me.items[current];
			form.appendChild( me.createHiddenElement( "item_name_" 		+ counter, item.name		) );
			form.appendChild( me.createHiddenElement( "item_quantity_" 	+ counter, item.quantity 	) );
			form.appendChild( me.createHiddenElement( "item_price_" 		+ counter, item.price		) );
			form.appendChild( me.createHiddenElement( "item_currency_" 	+ counter, me.currency 	) );
			form.appendChild( me.createHiddenElement( "item_tax_rate_" 	+ counter, me.taxRate 	) );
			form.appendChild( me.createHiddenElement( "_charset_"					 , ""				) );
			
			var descriptionString = "";
			
			for( var field in item){
				if( typeof( item[field] ) != "function" && 
									field != "id" 		&& 
									field != "quantity"	&& 
									field != "price" )
				{
						descriptionString = descriptionString + ", " + field + ": " + item[field];				
				}
			}
			descriptionString = descriptionString.substring( 1 );
			form.appendChild( me.createHiddenElement( "item_description_" + counter, descriptionString) );
			counter++;
		}
		
		document.body.appendChild( form );
		form.submit();
		document.body.removeChild( form );
	};
	
	
	
	me.emailCheckout = function() { //ESTA FUNCIÓN ESTABA SIN DEFINIR
		var cuerpoMsg = "<table border=1><tr><th>REFERENCIA</th><th>NOMBRE</th><th>CANTIDAD</th><th>PRECIO</th><th>TOTAL</th></tr>";
		var total = 0;
		var subtotal = 0;
		var prods = new Array(); //Array de productos. Se guardará de cada producto la referencia, el precio y la cantidad
		//Recorrer todos los items del carrito para generar una tabla
		for( var current in this.items ){
			//Extraer los datos de cada item
			var item = this.items[current];
			var nombre = item.name;
			var cantidad = item.quantity;
			var precioUd = item.price;
			
			//El nombre incluye también la referencia.
			var trozosNombre = nombre.split("<br/>");
			
			//Extraer la referencia de la segunda parte del nombre
			var inicio = trozosNombre[1].indexOf("Ref. ") + 5;
			var fin = trozosNombre[1].indexOf("</span>");
			var reference = trozosNombre[1].substring(inicio, fin);
			prods.push(new Array(reference, precioUd, cantidad)); //Guardar datos del producto en el array
			
			subtotal = cantidad * precioUd;
			total += subtotal;
			cuerpoMsg += "<tr><td>" + trozosNombre[1] + "</td><td>" + trozosNombre[0] + "</td><td>" + cantidad + "</td><td>" + precioUd + "EUR</td><td>" + subtotal + "EUR</td></tr>";
		}
		var totalConIva = total * 1.18; //Calcular total con IVA
		totalConIva = Math.round(totalConIva * Math.pow(10, 2)) / Math.pow(10, 2); //Redondear el total a 2 decimales
		cuerpoMsg += "<tr><td></td><td></td><td></td><td>SUBTOTAL: " + total + "EUR</td><td>TOTAL: " + totalConIva + "EUR</td></tr></table>";
		
		//No se permiten pedidos por un importe inferior a 30 euros
		if(me.total < 30){
			$("#pedidoMinA").fancybox({
				'transitionIn' : 'elastic',
				'transitionOut' : 'elastic',
				'padding' : 20,
				'centerOnScroll' : true
			}).trigger('click');
			return;
		}
		
		//Llamar de forma asíncrona al script que guarda el contenido del carrito en una variable de sesión
		var data = {
			'cuerpoMsg' : cuerpoMsg,
			'total' : totalConIva,
			'prods' : prods
		};
		$.ajax({
			type: 'POST',
			cache: false,
			url: 'guardarContCarritoTemp.php',
			data: data, 
			success: function(msg){
				//Si no hay errores, redirigir a la página con el formulario de datos de envío
				location.href = "#cesta_compra_formulario.php";
			}
		});
		
		return;
	};
	
	me.customCheckout = function() { //SIN DEFINIR
		return;
	};




	/******************************************************
				data storage and retrival 
	 ******************************************************/
	
	/* load cart from cookie */
	me.load = function () {
		var me = this;
		/* initialize variables and items array */
		me.items = {};
		me.total = 0.00;
		me.quantity = 0;
		
		/* retrieve item data from cookie */
		if( readCookie('simpleCart') ){
			var data = unescape(readCookie('simpleCart')).split('++');
			for(var x=0, xlen=data.length;x<xlen;x++){
			
				var info = data[x].split('||');
				var newItem = new CartItem();
			
				if( newItem.parseValuesFromArray( info ) ){
					newItem.checkQuantityAndPrice();
					/* store the new item in the cart */
					me.items[newItem.id] = newItem;
				}
 			}
		}
		me.isLoaded = true;
	};
	
	
	
	/* save cart to cookie */
	me.save = function () {
		var dataString = "";
		for( var item in this.items ){
			dataString = dataString + "++" + this.items[item].print();
		}
		createCookie('simpleCart', dataString.substring( 2 ), 30 );
	};
	
	

	
		
	/******************************************************
				 view management 
	 ******************************************************/
	
	me.initializeView = function() {
		var me = this;
		me.totalOutlets 			= getElementsByClassName('simpleCart_total');
		me.quantityOutlets 			= getElementsByClassName('simpleCart_quantity');
		me.cartDivs 				= getElementsByClassName('simpleCart_items');
		me.taxCostOutlets			= getElementsByClassName('simpleCart_taxCost');
		me.taxRateOutlets			= getElementsByClassName('simpleCart_taxRate');
		me.shippingCostOutlets		= getElementsByClassName('simpleCart_shippingCost');
		me.finalTotalOutlets		= getElementsByClassName('simpleCart_finalTotal');
		
		me.addEventToArray( getElementsByClassName('simpleCart_checkout') , simpleCart.checkout , "click");
		me.addEventToArray( getElementsByClassName('simpleCart_empty') 	, simpleCart.empty , "click" );
		
		me.Shelf.readPage();
			
		me.pageIsReady = true;
		
	};
	
	
	
	me.updateView = function() {
		me.updateViewTotals();
		if( me.cartDivs && me.cartDivs.length > 0 ){ 
			me.updateCartView();
			textosCarrito(); //Función para cambiar algunos textos y formatos del carrito
		}
	};
	
	me.updateViewTotals = function() {
		var outlets = [ ["quantity"		, "none"		] , 
						["total"		, "currency"	] , 
						["shippingCost"	, "currency"	] ,
						["taxCost"		, "currency"	] ,
						["taxRate"		, "percentage"	] ,
						["finalTotal"	, "currency"	] ];
						
		for( var x=0,xlen=outlets.length; x<xlen;x++){
			
			var arrayName = outlets[x][0] + "Outlets",
				outputString;
				
			for( var element in me[ arrayName ] ){
				switch( outlets[x][1] ){
					case "none":
						outputString = "" + me[outlets[x][0]];
						break;
					case "currency":
						outputString = me.valueToCurrencyString( me[outlets[x][0]] );
						break;
					case "percentage":
						outputString = me.valueToPercentageString( me[outlets[x][0]] );
						break;
					default:
						outputString = "" + me[outlets[x][0]];
						break;
				}
				me[arrayName][element].innerHTML = "" + outputString;
			}
		}
	};
	
	me.updateCartView = function() {
		var newRows = [],
			x,newRow,item,current,header,newCell,info,outputValue,option,headerInfo;
		
		/* create headers row */
		newRow = document.createElement('div');
		for( header in me.cartHeaders ){
			newCell = document.createElement('div');
			headerInfo = me.cartHeaders[header].split("_");
			
			newCell.innerHTML = headerInfo[0];
			newCell.className = "item" + headerInfo[0];
			for(x=1,xlen=headerInfo.length;x<xlen;x++){
				if( headerInfo[x].toLowerCase() == "noheader" ){
					newCell.style.display = "none";
				}
			}
			newRow.appendChild( newCell );
			
		}
		newRow.className = "cartHeaders";
		newRows[0] = newRow;
		
		/* create a row for each item in the cart */
		x=1;
		for( current in me.items ){
			newRow = document.createElement('div');
			item = me.items[current];
			
			for( header in me.cartHeaders ){
				
				newCell = document.createElement('div');
				info = me.cartHeaders[header].split("_");
				
				switch( info[0].toLowerCase() ){
					case "total":
						outputValue = me.valueToCurrencyString(parseFloat(item.price)*parseInt(item.quantity,10) );
						break;
					case "increment":
						outputValue = me.valueToLink( "+" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].increment();\"" );
						break;
					case "decrement":
						outputValue = me.valueToLink( "-" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].decrement();\"" );
						break;
					case "remove":
						/* outputValue = me.valueToLink( "Remove" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].remove();\"" ); */
						outputValue = me.valueToLink( "x" , "javascript:;" , "onclick=\"simpleCart.items[\'" + item.id + "\'].remove();\"" );
						break;
					case "price":
						outputValue = me.valueToCurrencyString( item[ info[0].toLowerCase() ] ? item[info[0].toLowerCase()] : " " );
						break;
					default: 
						outputValue = item[ info[0].toLowerCase() ] ? item[info[0].toLowerCase()] : " ";
						break;
				}	
				
				for( var y=1,ylen=info.length;y<ylen;y++){
					option = info[y].toLowerCase();
					switch( option ){
						case "image":
						case "img":
							outputValue = me.valueToImageString( outputValue );		
							break;
						case "input":
							outputValue = me.valueToTextInput( outputValue , "onchange=\"simpleCart.items[\'" + item.id + "\'].set(\'" + outputValue + "\' , this.value);\""  );
							break;
						case "div":
						case "span":
						case "h1":
						case "h2":
						case "h3":
						case "h4":
						case "p":
							outputValue = me.valueToElement( option , outputValue , "" );
							break;
						case "noheader":
							break;
						default:
							error( "unkown header option: " + option );
							break;
					}
				
				}		  
				newCell.innerHTML = outputValue;
				newCell.className = "item" + info[0];
				newRow.appendChild( newCell );
			}			
			newRow.className = "itemContainer";
			newRows[x] = newRow;
			x++;
		}
		
		
		
		for( current in me.cartDivs ){
			
			/* delete current rows in div */
			var div = me.cartDivs[current];
			while( div.childNodes[0] ){
				div.removeChild( div.childNodes[0] );
			}
			
			for(var j=0, jLen = newRows.length; j<jLen; j++){
				div.appendChild( newRows[j] );
			}
			
			
		}
	};

	me.addEventToArray = function ( array , functionCall , theEvent ) {
		for( var outlet in array ){
			var element = array[outlet];
			if( element.addEventListener ) {
				element.addEventListener(theEvent, functionCall , false );
			} else if( element.attachEvent ) {
			  	element.attachEvent( "on" + theEvent, functionCall );
			}
		}
	};
	
	
	me.createHiddenElement = function ( name , value ){
		var element = document.createElement("input");
		element.type = "hidden";
		element.name = name;
		element.value = value;
		return element;
	};
	
	
	
	/******************************************************
				Currency management
	 ******************************************************/
	
	me.currencySymbol = function() {		
		switch(me.currency){
			case JPY:
				return "&yen;";
			case EUR:
				return "&euro;";
			case GBP:
				return "&pound;";
			case CAD:
				return "";
			case USD:
			case AUD:
			case NZD:
			case HKD:
			case SGD:
				return "&#36;";
			default:
				return "";
		}
	};
	
	
	me.currencyStringForPaypalCheckout = function( value ){
		if( me.currencySymbol() == "&#36;" ){
			return "$" + parseFloat( value ).toFixed(2);
		} else {
			return "" + parseFloat(value ).toFixed(2);
		}
	};
	
	/******************************************************
				Formatting
	 ******************************************************/
	
	
	me.valueToCurrencyString = function( value ) {
		return parseFloat( value ).toCurrency( me.currencySymbol() );
	};
	
	me.valueToPercentageString = function( value ){
		return parseFloat( 100*value ) + "%";
	};
	
	me.valueToImageString = function( value ){
		if( value.match(/<\s*img.*src\=/) ){
			return value;
		} else {
			return "<img src=\"" + value + "\" />";
		}
	};
	
	me.valueToTextInput = function( value , html ){
		return "<input type=\"text\" value=\"" + value + "\" " + html + " />";
	};
	
	me.valueToLink = function( value, link, html){
		return "<a href=\"" + link + "\" " + html + " >" + value + "</a>";
	};
	
	me.valueToElement = function( type , value , html ){
		return "<" + type + " " + html + " > " + value + "</" + type + ">";
	};
	
	/******************************************************
				Duplicate management
	 ******************************************************/
	
	me.hasItem = function ( item ) {
		for( var current in me.items ) {
			var testItem = me.items[current];
			var matches = true;
			for( var field in item ){
				if( typeof( item[field] ) != "function"	&& 
					field != "quantity"  				&& 
					field != "id" 						){
					if( item[field] != testItem[field] ){
						matches = false;
					}
				}	
			}
			if( matches ){ 
				return current; 
			}
		}
		return false;
	};
	
	
	
	
	/******************************************************
				Cart Update managment
	 ******************************************************/
	
	me.update = function() {
		if( !simpleCart.isLoaded ){
			simpleCart.load();
		} 
		if( !simpleCart.pageIsReady ){
			simpleCart.initializeView();
		}
		me.updateTotals();
		me.updateView();
		me.save();
	};
	
	me.updateTotals = function() {
		me.total = 0 ;
		me.quantity  = 0;
		for( var current in me.items ){
			var item = me.items[current];
			if( item.quantity < 1 ){ 
				item.remove();
			} else if( item.quantity !== null && item.quantity != "undefined" ){
				me.quantity = parseInt(me.quantity,10) + parseInt(item.quantity,10); 
			}
			if( item.price ){ 
				me.total = parseFloat(me.total) + parseInt(item.quantity,10)*parseFloat(item.price); 
			}
		}
		me.shippingCost = me.shipping();
		me.taxCost = parseFloat(me.total)*me.taxRate;
		me.finalTotal = me.shippingCost + me.taxCost + me.total;
	};
	
	me.shipping = function(){
		if( parseInt(me.quantity,10)===0 )
			return 0;
		var shipping = 	parseFloat(me.shippingFlatRate) + 
					  	parseFloat(me.shippingTotalRate)*parseFloat(me.total) +
						parseFloat(me.shippingQuantityRate)*parseInt(me.quantity,10),
			nextItem,
			next;
		for(next in me.items){
			nextItem = me.items[next];
			if( nextItem.shipping ){
				if( typeof nextItem.shipping == 'function' ){
					shipping += parseFloat(nextItem.shipping());
				} else {
					shipping += parseFloat(nextItem.shipping);
				}
			}
		}
		
		return shipping;
	}
	
	me.initialize = function() {
		simpleCart.initializeView();
		simpleCart.load();
		simpleCart.update();
	};
				
}

/********************************************************************************************************
 *			Cart Item Object
 ********************************************************************************************************/

function CartItem() {
	this.id = "c" + NextId++;
	var me = this;
}
	CartItem.prototype.set = function ( field , value ){
		field = field.toLowerCase();
		if( typeof( this[field] ) != "function" && field != "id" ){
			if( field == "quantity" ){
				value = value.replace( /[^(\d|\.)]*/gi , "" );
				value = value.replace(/,*/gi, "");
				value = parseInt(value,10);
			} else if( field == "price"){
				value = value.replace( /[^(\d|\.)]*/gi, "");
				value = value.replace(/,*/gi , "");
				value = parseFloat( value );
			}
			if( typeof(value) == "number" && isNaN( value ) ){
				error( "Improperly formatted input.");
			} else {
				this[field] = value;
				this.checkQuantityAndPrice();
			}			
		} else {
			error( "Cannot change " + field + ", this is a reserved field.");
		}
		simpleCart.update();
	};
	
	CartItem.prototype.increment = function(){
		//Extraer la referencia del producto que se va a incrementar
		var ref = this.name;
		ref = ref.substring(ref.indexOf("Ref. ") + 5);
		ref = ref.replace("</span>", "");
		
		$.ajax({
			type: 'POST',
			cache: false,
			url: 'ofertaAsociada.php',
			data: "ref=" + ref, 
			success: function(msg){
				//Recoger los datos del servidor
				var pos = msg.indexOf("devolver : ") + 11;
				var devolver = msg.substring(pos, pos + 2);
				pos = msg.indexOf("segundaRef : ") + 13;
				var segundaRef = msg.substring(pos);
				
				//Controlar si se ha producido algún error
				if(devolver != "00"){
					alert("Error al incrementar el producto");
				}else{
					//Evaluar si hay oferta de tipo "regalo". En tal caso el producto que se regala deberá ser incrementado a la vez que el otro
					var newRef = "-1";
					switch(segundaRef){
						case '' : break;
						case 'oferta1' : 
							newRef = ref;
							break;
						case 'oferta2' : break;
						default :
							newRef = segundaRef;
					}
					//A partir de la referencia, buscar el item del carrito que se debe incrementar a la vez que este.
					if(newRef != "-1"){
						for(var item in simpleCart.items){
							if(simpleCart.items[item].name.indexOf(newRef) != -1 && simpleCart.items[item].price == 0.00){
								simpleCart.items[item].quantity = parseInt(simpleCart.items[item].quantity,10) + 1;
								simpleCart.update();
							}
						}
					}
				}
			},
			error: function(){}
		});
		
		this.quantity = parseInt(this.quantity,10) + 1;
		simpleCart.update();
	};
	
	CartItem.prototype.decrement = function(){
		//Extraer la referencia del producto que se va a incrementar
		var ref = this.name;
		ref = ref.substring(ref.indexOf("Ref. ") + 5);
		ref = ref.replace("</span>", "");
		
		$.ajax({
			type: 'POST',
			cache: false,
			url: 'ofertaAsociada.php',
			data: "ref=" + ref, 
			success: function(msg){
				//Recoger los datos del servidor
				var pos = msg.indexOf("devolver : ") + 11;
				var devolver = msg.substring(pos, pos + 2);
				pos = msg.indexOf("segundaRef : ") + 13;
				var segundaRef = msg.substring(pos);
				
				//Controlar si se ha producido algún error
				if(devolver != "00"){
					alert("Error al incrementar el producto");
				}else{
					//Evaluar si hay oferta de tipo "regalo". En tal caso el producto que se regala deberá ser incrementado a la vez que el otro
					var newRef = "-1";
					switch(segundaRef){
						case '' : break;
						case 'oferta1' : 
							newRef = ref;
							break;
						case 'oferta2' : break;
						default :
							newRef = segundaRef;
					}
					//A partir de la referencia, buscar el item del carrito que se debe incrementar a la vez que este.
					if(newRef != "-1"){
						for(var item in simpleCart.items){
							if(simpleCart.items[item].name.indexOf(newRef) != -1 && simpleCart.items[item].price == 0.00){
								if( parseInt(simpleCart.items[item].quantity,10) < 2 ){
									simpleCart.items[item].remove();
								} else {
									simpleCart.items[item].quantity = parseInt(simpleCart.items[item].quantity,10) - 1;
									simpleCart.update();
								}
							}
						}
					}
				}
			},
			error: function(){}
		});
		
		if( parseInt(this.quantity,10) < 2 ){
			this.remove();
		} else {
			this.quantity = parseInt(this.quantity,10) - 1;
			simpleCart.update();
		}
	};
	
	CartItem.prototype.print = function () {
		var returnString = '';
		for( var field in this ) {
			if( typeof( this[field] ) != "function" ) {
				returnString+= escape(field) + "=" + escape(this[field]) + "||";
			}
		}
		return returnString.substring(0,returnString.length-2);
	};
	
	
	CartItem.prototype.checkQuantityAndPrice = function() {
		if( !this.quantity || this.quantity == null || this.quantity == 'undefined'){ 
			this.quantity = 1;
			error('No quantity for item.');
		} else {
			this.quantity = ("" + this.quantity).replace(/,*/gi, "" );
			this.quantity = parseInt( ("" + this.quantity).replace( /[^(\d|\.)]*/gi, "") , 10); 
			if( isNaN(this.quantity) ){
				error('Quantity is not a number.');
				this.quantity = 1;
			}
		}
				
		if( !this.price || this.price == null || this.price == 'undefined'){
			this.price = "0.00";
			error('No price for item or price not properly formatted.');
		} else {
			this.price = ("" + this.price).replace(/,*/gi, "" );
			this.price = parseFloat( ("" + this.price).replace( /[^(\d|\.)]*/gi, "") ); 
			if( isNaN(this.price) ){
				error('Price is not a number.');
				this.price = "0.00";
			}
		}
	};
	
	
	CartItem.prototype.parseValuesFromArray = function( array ) {
		if( array && array.length && array.length > 0) {
			for(var x=0, xlen=array.length; x<xlen;x++ ){
			
				/* ensure the pair does not have key delimeters */
				array[x].replace(/||/, "| |");
				array[x].replace(/\+\+/, "+ +");
			
				/* split the pair and save the unescaped values to the item */
				var value = array[x].split('=');
				if( value.length>1 ){
					if( value.length>2 ){
						for(var j=2, jlen=value.length;j<jlen;j++){
							value[1] = value[1] + "=" + value[j];
						}
					}
					this[ unescape(value[0]).toLowerCase() ] = unescape(value[1]);
				}
			}
			return true;
		} else {
			return false;
		}
	};
	
	CartItem.prototype.remove = function() {
		simpleCart.remove(this.id);
		simpleCart.update();
	};
	


/********************************************************************************************************
 *			Shelf Object for managing items on shelf that can be added to cart
 ********************************************************************************************************/

function Shelf(){
	this.items = {};
}	
	Shelf.prototype.readPage = function () {
		this.items = {};
		var newItems = getElementsByClassName( "simpleCart_shelfItem" );
		for( var current in newItems ){
			var newItem = new ShelfItem();
			this.checkChildren( newItems[current] , newItem );
			this.items[newItem.id] = newItem;
		}
	};
	
	Shelf.prototype.checkChildren = function ( item , newItem) {
		
		for(var x=0;item.childNodes[x];x++){
			
			var node = item.childNodes[x];
			if( node.className && node.className.match(/item_[^ ]+/) ){
				
				var data = /item_[^ ]+/.exec(node.className)[0].split("_");
				
				if( data[1] == "add" || data[1] == "Add" ){
					var tempArray = [];
					tempArray.push( node );
					var addFunction = simpleCart.Shelf.addToCart(newItem.id);
					simpleCart.addEventToArray( tempArray , addFunction , "click");
					node.id = newItem.id;
				} else {
					newItem[data[1]]  = node;
				}
			}		
			if( node.childNodes[0] ){ 
				this.checkChildren( node , newItem );	
			}	
		}
	};
	
	Shelf.prototype.empty = function () {
		this.items = {};
	};
	
	
	Shelf.prototype.addToCart = function ( id ) {
		return function(){
			if( simpleCart.Shelf.items[id]){
				simpleCart.Shelf.items[id].addToCart();
			} else {
				error( "Shelf item with id of " + id + " does not exist.");
			}
		};
	};
	

/********************************************************************************************************
 *			Shelf Item Object
 ********************************************************************************************************/


function ShelfItem(){
	this.id = "s" + NextId++;
}	
	ShelfItem.prototype.remove = function () {
		simpleCart.Shelf.items[this.id] = null;
	};
	
	
	ShelfItem.prototype.addToCart = function () {
		var outStrings = [],valueString;
		for( var field in this ){
			if( typeof( this[field] ) != "function" && field != "id" ){
				valueString = "";
				
				switch(field){
					case "price":
						if( this[field].value ){
							valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							valueString = this[field].innerHTML;
						}
						/* remove all characters from price except digits and a period */
						valueString = valueString.replace( /[^(\d|\.)]*/gi , "" );
						valueString = valueString.replace( /,*/ , "" );
						break;
					case "image":
						valueString = this[field].src;
						break;
					default:
						if( this[field].value ){
							valueString = this[field].value; 
						} else if( this[field].innerHTML ) {
							valueString = this[field].innerHTML;
						} else if( this[field].src ){
							valueString = this[field].src;
						} else {
							valueString = this[field];
						}
						break;
				}
				outStrings.push( field + "=" + valueString );
			}
		}
		
		simpleCart.add( outStrings );
	};
	


/********************************************************************************************************
 * Thanks to Peter-Paul Koch for these cookie functions (http://www.quirksmode.org/js/cookies.html)
 ********************************************************************************************************/
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}


//*************************************************************************************************
/*
	Developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/	
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};


/********************************************************************************************************
 *  Helpers
 ********************************************************************************************************/


String.prototype.reverse=function(){return this.split("").reverse().join("");};
Number.prototype.withCommas=function(){var x=6,y=parseFloat(this).toFixed(2).toString().reverse();while(x<y.length){y=y.substring(0,x)+","+y.substring(x);x+=4;}return y.reverse();};
Number.prototype.toCurrency=function(){return(arguments[0]?arguments[0]:"")+this.withCommas() +"&euro;";};


/********************************************************************************************************
 * error management 
 ********************************************************************************************************/

function error( message ){
	try{ 
		console.log( message ); 
	}catch(err){ 
	//	alert( message );
	}
}


var simpleCart = new Cart();

if( typeof jQuery !== 'undefined' ) $(document).ready(function(){simpleCart.initialize();}); 
else if( typeof Prototype !== 'undefined') Event.observe( window, 'load', function(){simpleCart.initialize();});
else window.onload = simpleCart.initialize;