Finalisation du panier

src/cart/CartActions.ts

+import { Dispatch } from 'react';
+import { Product, ActionType } from './CartTypes';
+
+export function addToCart(cart: Product[], dispatch: Dispatch<ActionType>, product: Product): Product[] {
+    let newCart: Product[] = cart;
+
+    // Check if product already exists in cart, then update quantity
+    const existingProduct = newCart.find(p => p.name === product.name);
+
+    if (existingProduct) {
+        existingProduct.quantity = existingProduct.quantity ? existingProduct.quantity + 1 : 1;
+        existingProduct.stockPrice = existingProduct.price * existingProduct.quantity;
+        return setCart(newCart, dispatch);
+    }
+
+    // If not, add product to cart
+    return setCart([...cart, { ...product, quantity: 1, stockPrice: product.price}], dispatch);
+}
+
+export function removeFromCart(cart: Product[], dispatch: Dispatch<ActionType>, product: Product): Product[] {
+    let newCart: Product[] = cart;
+
+    // Check if product already exists in cart, then update quantity
+    const existingProduct = newCart.find(p => p.name === product.name);
+    if (existingProduct) {
+        existingProduct.quantity = existingProduct.quantity ? existingProduct.quantity - 1 : 0;
+        existingProduct.stockPrice = existingProduct.price * existingProduct.quantity;
+        // If quantity is 0, remove product from cart
+        if (existingProduct.quantity === 0) {
+            return setCart(newCart.filter(p => p.name !== product.name), dispatch);
+        }
+        return setCart(newCart, dispatch);
+    }
+
+    return setCart(cart, dispatch);
+}
+
+export function updateProductQuantity(cart: Product[], dispatch: Dispatch<ActionType>, product: Product, quantity: number): Product[] {
+    let newCart: Product[] = cart;
+
+    // Check if product already exists in cart, then update quantity
+    const existingProduct = newCart.find(p => p.name === product.name);
+    if (existingProduct) {
+        existingProduct.quantity = quantity;
+        existingProduct.stockPrice = existingProduct.price * quantity;
+
+        if (existingProduct.quantity === 0) {
+            return setCart(newCart.filter(p => p.name !== product.name), dispatch);
+        }
+        return setCart(newCart, dispatch);
+    }
+
+    return setCart(newCart, dispatch);
+}
+
+function setCart(newCart: Product[], dispatch: Dispatch<ActionType>): Product[]{
+    dispatch({ type: 'SET_CART', payload: newCart });
+    return newCart;
+}
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