carrinhojs

carrinho.js

    var CART_NAME = "ItensCart";

    function addItem(obj) {
        if (isEmptyCart()) {
            localStorage.setItem(CART_NAME, JSON.stringify([obj]));
        };
        if (itemExists(obj)) {
            updateQuantity(obj.id);
        } else {
            var Cart = JSON.parse(localStorage.getItem(CART_NAME));
            Cart.push(obj);
            localStorage.setItem(CART_NAME, JSON.stringify(Cart));
        }
    };

    function updateQuantity(id, qty) {
        var quantity = qty || 1;
        var Cart = JSON.parse(localStorage.getItem(CART_NAME));
        var cartUpdate = Cart.map(function(item) {
            if (item.id === id) {
                if (!qty) {
                    item.qty += quantity;
                }else{
                  item.qty = quantity;
                }
            }
            return item;
        });
        localStorage.setItem(CART_NAME, JSON.stringify(cartUpdate));
    };

    function itemExists(item) {
        var cond = {
          id : item.id
        }
        return (_.where(JSON.parse(localStorage.getItem("ItensCart")), cond).length > 0);
    }

    function isEmptyCart() {
        return (localStorage.getItem(CART_NAME) === null);
    }

    return {
        addItem: addItem,
        updateQuantity: updateQuantity
    }