import { create } from "zustand";
import { persist } from "zustand/middleware";

export interface CartItem {
  productId: number;
  name: string;
  slug: string;
  price: number;
  originalPrice: number;
  image: string;
  quantity: number;
  productType: string;
}

interface CartState {
  items: CartItem[];
  addItem: (item: Omit<CartItem, "quantity">) => void;
  removeItem: (productId: number) => void;
  updateQuantity: (productId: number, quantity: number) => void;
  clearCart: () => void;
  getTotalItems: () => number;
  getTotalPrice: () => number;
  getTotalOriginalPrice: () => number;
}

export const useCartStore = create<CartState>()(
  persist(
    (set, get) => ({
      items: [],

      addItem: (item) => {
        const { items } = get();
        const existing = items.find((i) => i.productId === item.productId);
        if (existing) {
          set({
            items: items.map((i) =>
              i.productId === item.productId
                ? { ...i, quantity: i.quantity + 1 }
                : i
            ),
          });
        } else {
          set({ items: [...items, { ...item, quantity: 1 }] });
        }
      },

      removeItem: (productId) => {
        set({ items: get().items.filter((i) => i.productId !== productId) });
      },

      updateQuantity: (productId, quantity) => {
        if (quantity <= 0) {
          set({ items: get().items.filter((i) => i.productId !== productId) });
        } else {
          set({
            items: get().items.map((i) =>
              i.productId === productId ? { ...i, quantity } : i
            ),
          });
        }
      },

      clearCart: () => set({ items: [] }),

      getTotalItems: () =>
        get().items.reduce((sum, item) => sum + item.quantity, 0),

      getTotalPrice: () =>
        get().items.reduce(
          (sum, item) => sum + item.price * item.quantity,
          0
        ),

      getTotalOriginalPrice: () =>
        get().items.reduce(
          (sum, item) => sum + item.originalPrice * item.quantity,
          0
        ),
    }),
    {
      name: "dealstack-cart",
    }
  )
);