import api from './api';
import { CartItem } from '../store/cartStore';

export interface OrderItem {
  id: string;
  orderId: string;
  productId: string | null;
  quantity: number;
  product?: any;
}

export interface Order {
  id: string;
  userId: string;
  couponId: string | null;
  totalAmount: number;
  charityDonation: number;
  status: string;
  trackingNumber: string | null;
  createdAt: string;
  orderItems: OrderItem[];
}

export class OrderService {
  private static instance: OrderService;

  private constructor() {}

  public static getInstance(): OrderService {
    if (!OrderService.instance) {
      OrderService.instance = new OrderService();
    }
    return OrderService.instance;
  }

  /**
   * Create a new order on the backend
   */
  public async createOrder(orderData: {
    petId?: string;
    couponCode?: string;
    prescriptionUrl?: string;
    charityDonation?: number;
    paymentMethod?: string;
    isRefill?: boolean;
    refillIntervalDays?: number;
    shippingAddress?: string;
    items: { productId: string; quantity: number }[];
  }): Promise<Order> {
    try {
      const response = await api.post('/orders', orderData);
      return response.data;
    } catch (error: any) {
      const message = error.response?.data?.message || 'خطا در ثبت سفارش';
      throw new Error(Array.isArray(message) ? message[0] : message);
    }
  }

  /**
   * Get all orders for the current user
   */
  public async getUserOrders(): Promise<Order[]> {
    try {
      const response = await api.get('/orders');
      return response.data.data;
    } catch (error: any) {
      const message = error.response?.data?.message || 'خطا در دریافت لیست سفارش‌ها';
      throw new Error(Array.isArray(message) ? message[0] : message);
    }
  }

  /**
   * Get order details by ID
   */
  public async getOrderById(id: string): Promise<Order> {
    try {
      const response = await api.get(`/orders/${id}`);
      return response.data;
    } catch (error: any) {
      const message = error.response?.data?.message || 'خطا در دریافت جزئیات سفارش';
      throw new Error(Array.isArray(message) ? message[0] : message);
    }
  }
}

export const orderService = OrderService.getInstance();