export type CartItem = {
  productId: string;
  variantId?: string;
  slug: string;
  name: string;
  image: string;
  price: number;
  qty: number;
};

const KEY = "salar-cart";

export function getCart(): CartItem[] {
  if (typeof window === "undefined") return [];
  try {
    const raw = window.localStorage.getItem(KEY);
    return raw ? (JSON.parse(raw) as CartItem[]) : [];
  } catch {
    return [];
  }
}

export function cartCount() {
  return getCart().reduce((sum, item) => sum + item.qty, 0);
}

export function addToCart(item: CartItem) {
  const cart = getCart();
  const index = cart.findIndex(
    (entry) => entry.productId === item.productId && entry.variantId === item.variantId,
  );
  if (index >= 0) {
    cart[index] = { ...cart[index], qty: cart[index].qty + item.qty };
  } else {
    cart.push(item);
  }
  window.localStorage.setItem(KEY, JSON.stringify(cart));
  window.dispatchEvent(new Event("cart-updated"));
}