Initial commit

assets/js/cart.js

@@ -0,0 +1,110 @@
+const Cart = (function () {
+	const STORAGE_KEY = "cart";
+	const TAX_RATE = 0.05;
+	let couponDiscount = 0;
+
+	// ─────────────────────────────
+	// Internal
+	// ─────────────────────────────
+	function getCart() {
+		return JSON.parse(localStorage.getItem(STORAGE_KEY)) || [];
+	}
+
+	function saveCart(cart) {
+		localStorage.setItem(STORAGE_KEY, JSON.stringify(cart));
+		window.dispatchEvent(new Event("cartUpdated"));
+	}
+
+	function findItem(cart, id) {
+		return cart.find((item) => item.id === id);
+	}
+
+	// ─────────────────────────────
+	// Public API
+	// ─────────────────────────────
+
+	function addItem(product, quantity = 1) {
+		const cart = getCart();
+		const existing = findItem(cart, product.id);
+
+		if (existing) {
+			existing.quantity += quantity;
+		} else {
+			cart.push({
+				id: product.id,
+				name: product.basic.name,
+				price: product.pricing.price,
+				image: product.media.mainImage,
+				quantity,
+			});
+		}
+
+		saveCart(cart);
+	}
+
+	function removeItem(id) {
+		const cart = getCart().filter((item) => item.id !== id);
+		saveCart(cart);
+	}
+
+	function updateQuantity(id, quantity) {
+		const cart = getCart();
+		const item = findItem(cart, id);
+		if (!item) return;
+
+		item.quantity = Math.max(1, quantity);
+		saveCart(cart);
+	}
+
+	function clear() {
+		localStorage.removeItem(STORAGE_KEY);
+		window.dispatchEvent(new Event("cartUpdated"));
+	}
+
+	function applyCoupon(code) {
+		if (code === "MEDI10") {
+			couponDiscount = 0.1;
+			window.dispatchEvent(new Event("cartUpdated"));
+			return true;
+		}
+
+		couponDiscount = 0;
+		window.dispatchEvent(new Event("cartUpdated"));
+		return false;
+	}
+
+	function getTotals() {
+		const cart = getCart();
+
+		const subtotal = cart.reduce(
+			(sum, item) => sum + item.price * item.quantity,
+			0
+		);
+
+		const tax = subtotal * TAX_RATE;
+		const discount = subtotal * couponDiscount;
+		const total = subtotal - discount;
+
+		return {
+			subtotal,
+			tax,
+			discount,
+			total,
+		};
+	}
+
+	function getTotalCount() {
+		return getCart().reduce((sum, item) => sum + item.quantity, 0);
+	}
+
+	return {
+		getCart,
+		addItem,
+		removeItem,
+		updateQuantity,
+		clear,
+		applyCoupon,
+		getTotals,
+		getTotalCount,
+	};
+})();