code from amapei

js/utils/CartUtils.hx

@@ -0,0 +1,64 @@
+package utils;
+
+import Math;
+using Lambda;
+
+import Common;
+
+class CartUtils {
+  public static function addToCart(order:OrderSimple, productToAdd:ProductInfo, quantity:Int):OrderSimple {
+    var products = order.products.copy();
+    var total = order.total;
+
+    var existingProduct = products.find(function(p) {
+      return p.product.id == productToAdd.id;
+    });
+
+    if (existingProduct == null)
+      products.push({
+        product: productToAdd,
+        quantity: quantity
+      });
+    else
+      existingProduct.quantity += quantity;
+
+    total += quantity * productToAdd.price;
+    total = Math.round(total * 100) / 100; // to avoid calculation errors
+
+    return {
+      products: products,
+      total: total
+    };
+  }
+
+  public static function removeFromCart(order:OrderSimple, productToRemove:ProductInfo, ?quantity:Int):OrderSimple {
+    var products = order.products.copy();
+    var total = order.total;
+
+    var existingProduct = products.find(function(p) {
+      return p.product.id == productToRemove.id;
+    });
+
+    if (quantity == null)
+      quantity = existingProduct.quantity;
+
+    if (existingProduct == null)
+      throw "Can't remove a non existing product";
+    else if (quantity >= existingProduct.quantity)
+      products.remove(existingProduct)
+    else
+      existingProduct.quantity -= quantity;
+
+    if (products.length == 0)
+      total = 0;
+    else {
+      total -= Math.min(quantity, existingProduct.quantity) * productToRemove.price;
+      total = Math.round(total * 100) / 100; // to avoid calculation errors
+    }
+
+    return {
+      products: products,
+      total: total
+    };
+  }
+}