/**
 * API Client for WooNooW Customer SPA
 * Handles all HTTP requests to WordPress REST API
 */

// Get API base URL from WordPress
const getApiBase = (): string => {
  // @ts-ignore - WordPress global
  return window.woonoowCustomer?.apiUrl || '/wp-json/woonoow/v1';
};

// Get nonce for authentication
const getNonce = (): string => {
  // @ts-ignore - WordPress global
  return window.woonoowCustomer?.nonce || '';
};

interface RequestOptions {
  method?: 'GET' | 'POST' | 'PUT' | 'DELETE';
  body?: any;
  headers?: Record<string, string>;
}

class ApiClient {
  private baseUrl: string;

  constructor() {
    this.baseUrl = getApiBase();
  }

  private async request<T>(endpoint: string, options: RequestOptions = {}): Promise<T> {
    const { method = 'GET', body, headers = {} } = options;

    const url = `${this.baseUrl}${endpoint}`;
    
    const config: RequestInit = {
      method,
      headers: {
        'Content-Type': 'application/json',
        'X-WP-Nonce': getNonce(),
        ...headers,
      },
      credentials: 'same-origin',
    };

    if (body) {
      config.body = JSON.stringify(body);
    }

    try {
      const response = await fetch(url, config);

      if (!response.ok) {
        const error = await response.json().catch(() => ({ message: response.statusText }));
        throw new Error(error.message || `HTTP ${response.status}`);
      }

      return await response.json();
    } catch (error) {
      console.error('[API Error]', error);
      throw error;
    }
  }

  // GET request
  async get<T>(endpoint: string, params?: Record<string, any>): Promise<T> {
    let url = endpoint;
    if (params) {
      const query = new URLSearchParams(params).toString();
      url += `?${query}`;
    }
    return this.request<T>(url, { method: 'GET' });
  }

  // POST request
  async post<T>(endpoint: string, body?: any): Promise<T> {
    return this.request<T>(endpoint, { method: 'POST', body });
  }

  // PUT request
  async put<T>(endpoint: string, body?: any): Promise<T> {
    return this.request<T>(endpoint, { method: 'PUT', body });
  }

  // DELETE request
  async delete<T>(endpoint: string): Promise<T> {
    return this.request<T>(endpoint, { method: 'DELETE' });
  }
}

// Export singleton instance
export const api = new ApiClient();

// Export API endpoints
export const endpoints = {
  // Shop
  products: '/shop/products',
  product: (id: number) => `/shop/products/${id}`,
  categories: '/shop/categories',
  search: '/shop/search',
  
  // Cart
  cart: '/cart',
  cartAdd: '/cart/add',
  cartUpdate: '/cart/update',
  cartRemove: '/cart/remove',
  cartCoupon: '/cart/apply-coupon',
  
  // Checkout
  checkoutCalculate: '/checkout/calculate',
  checkoutCreate: '/checkout/create-order',
  paymentMethods: '/checkout/payment-methods',
  shippingMethods: '/checkout/shipping-methods',
  
  // Account
  orders: '/account/orders',
  order: (id: number) => `/account/orders/${id}`,
  downloads: '/account/downloads',
  profile: '/account/profile',
  password: '/account/password',
  addresses: '/account/addresses',
};