import axios from 'axios';
import type {
  InternalAxiosRequestConfig,
  AxiosResponse,
  AxiosRequestHeaders,
} from 'axios';
import router from '@/router';
import { Message, Modal } from '@arco-design/web-vue';
import { useUserStore } from '@/store';
import { useAuth } from '@/utils/auth';
import { refreshToken } from '@/api/user';
const { getToken, getRefreshToken, setToken, clearToken } = useAuth();

let isRefreshing = false;
let subscribers: ((token: string) => void)[] = [];

function subscribeTokenRefresh(cb: (token: string) => void) {
  subscribers.push(cb);
}

function onRefreshed(token: string) {
  subscribers.forEach(cb => cb(token));
  subscribers = [];
}

const instance = axios.create({
  baseURL: '/',
});
// 新增一个独立的函数来处理 Token 刷新
async function handleTokenRefresh(
  refreshTokenValue: string,
  originalConfig: InternalAxiosRequestConfig
) {
  isRefreshing = true;
  try {
    const res = await refreshToken({ token: refreshTokenValue });
    if (res && res.data && res.success) {
      const { token: newAccessToken, refreshToken: newRefreshToken } = res.data;
      setToken(newAccessToken, newRefreshToken);
      onRefreshed(newAccessToken);
      // 重试原始请求
      originalConfig.headers.Authorization = `${newAccessToken}`;
      return instance(originalConfig);
    } else {
      isRefreshing = false;
      clearToken();
      router.push({ name: 'login' });
      throw new Error('Invalid token refresh response');
    }
  } catch (error) {
    Message.error('登录状态已过期，请重新登录');
    clearToken();
    router.push({ name: 'login' });
    throw error; // 重新抛出错误，让外部拦截器可以继续处理
  } finally {
    isRefreshing = false;
  }
}

instance.interceptors.request.use(
  (config: InternalAxiosRequestConfig) => {
    // let each request carry token
    // this example using the JWT token
    // Authorization is a custom headers key
    // please modify it according to the actual situation
    const token = getToken();
    if (token) {
      if (!config.headers) {
        config.headers = {} as AxiosRequestHeaders;
      }
      config.headers.Authorization = `${token}`;
    }
    return config;
  },
  error => {
    // do something
    return Promise.reject(error);
  }
);
// 响应拦截器修复版本
instance.interceptors.response.use(
  (response: AxiosResponse) => {
    return response;
  },
  async error => {
    const { config, response } = error;
    const refreshTokenValue = getRefreshToken();
    if (!response) {
      // 网络错误处理
      Message.error('网络连接异常');
      return Promise.reject(error);
    }
    if (response.status === 401) {
      if (!isRefreshing) {
        isRefreshing = true;
        config._retry = true;
        if (refreshTokenValue) {
          return handleTokenRefresh(refreshTokenValue, config);
        }
      } else {
        return new Promise(resolve => {
          subscribeTokenRefresh((token: string) => {
            config.headers.Authorization = `${token}`;
            resolve(axios(config));
          });
        });
      }
    } else if (response.status === 403) {
      Message.error('没有权限执行此操作');
      // 可选：跳转到权限不足页面或首页
      // router.push({ name: 'forbidden' });
    } else if (response.status === 404) {
      Message.error('请求的资源不存在');
    } else if (response.status >= 500) {
      Message.error('服务器内部错误，请稍后再试');
    } else {
      Message.error(
        error.response?.data?.message || `请求错误: ${response.status}`
      );
    }
    return Promise.reject(error);
  }
);
export default instance;