src/store/useCartStore.js

import { create } from 'zustand';

const useCartStore = create((set, get) => ({
  items: [],

  addItem: (product) => {
    const items = get().items;
    const existing = items.find((i) => i.product_id === product.id);
    if (existing) {
      set({
        items: items.map((i) =>
          i.product_id === product.id
            ? { ...i, quantity: i.quantity + 1 }
            : i
        ),
      });
    } else {
      set({
        items: [...items, {
          product_id: product.id,
          name: product.name,
          price: product.price,
          quantity: 1,
        }],
      });
    }
  },

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

  updateQuantity: (productId, quantity) => {
    if (quantity <= 0) {
      get().removeItem(productId);
      return;
    }
    set({
      items: get().items.map((i) =>
        i.product_id === productId ? { ...i, quantity } : i
      ),
    });
  },

  getTotal: () => {
    return get().items.reduce((sum, i) => sum + i.price * i.quantity, 0);
  },

  getItemCount: () => {
    return get().items.reduce((sum, i) => sum + i.quantity, 0);
  },

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

  setItems: (newItems) => set({ items: newItems }),
}));

export default useCartStore;