/**
 * API 客户端配置
 * 封装 Axios 实例，配置拦截器和 Token 管理
 */
import axios, { AxiosError, InternalAxiosRequestConfig } from 'axios';

// 创建 Axios 实例
const apiClient = axios.create({
  baseURL: '/api/v1',
  timeout: 10000,
  headers: {
    'Content-Type': 'application/json',
  },
});

// 请求拦截器：添加 Token
apiClient.interceptors.request.use(
  (config: InternalAxiosRequestConfig) => {
    const token = localStorage.getItem('access_token');
    if (token && config.headers) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error: AxiosError) => {
    return Promise.reject(error);
  }
);

// 响应拦截器：处理错误和 Token 刷新
apiClient.interceptors.response.use(
  (response) => response,
  async (error: AxiosError) => {
    const originalRequest = error.config;

    // Token 过期，尝试刷新
    if (error.response?.status === 401 && originalRequest) {
      const refreshToken = localStorage.getItem('refresh_token');
      
      if (refreshToken) {
        try {
          const { data } = await axios.post('/api/v1/auth/refresh', {
            refresh_token: refreshToken,
          });
          
          // 保存新 Token
          localStorage.setItem('access_token', data.access_token);
          
          // 重试原请求
          if (originalRequest.headers) {
            originalRequest.headers.Authorization = `Bearer ${data.access_token}`;
          }
          return apiClient(originalRequest);
        } catch (refreshError) {
          // 刷新失败，清除 Token 并跳转登录
          localStorage.removeItem('access_token');
          localStorage.removeItem('refresh_token');
          window.location.href = '/login';
          return Promise.reject(refreshError);
        }
      } else {
        // 没有 refresh token，直接跳转登录
        window.location.href = '/login';
      }
    }

    return Promise.reject(error);
  }
);

export default apiClient;