// 請(qǐng)求攔截
axios.interceptors.request.use(config => {
  const accessToken = localStorage.getItem('access_token')
  if (accessToken) {
    config.headers.Authorization = `Bearer ${accessToken}`
  }
  return config
})

// 響應(yīng)攔截
axios.interceptors.response.use(
  response => response,
  async error => {
    const originalRequest = error.config
    // 如果是401（Token過(guò)期）且未重試過(guò)
    if (error.response.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true
      try {
        // 用 refresh_token 換新的 access_token
        const res = await axios.post('/refresh-token', {
          refresh_token: localStorage.getItem('refresh_token')
        })
        const { access_token, refresh_token } = res.data
        localStorage.setItem('access_token', access_token)
        localStorage.setItem('refresh_token', refresh_token)
        // 重新發(fā)之前的請(qǐng)求
        originalRequest.headers.Authorization = `Bearer ${access_token}`
        return axios(originalRequest)
      } catch (refreshError) {
        // refresh_token 也過(guò)期了，跳登錄頁(yè)
        window.location.href = '/login'
      }
    }
    return Promise.reject(error)
  }
)

// 檢查T(mén)oken剩余時(shí)間
function checkTokenExpiry() {
  const token = localStorage.getItem('access_token')
  if (!token) return false
  
  const payload = JSON.parse(atob(token.split('.')[1])) // 解析JWT
  const expiresIn = payload.exp * 1000 - Date.now()
  
  // 如果還剩5分鐘過(guò)期，就續(xù)期
  if (expiresIn < 5 * 60 * 1000) {
    refreshToken()
  }
}

// 定時(shí)檢查（每10分鐘一次）
setInterval(checkTokenExpiry, 10 * 60 * 1000)

function refreshToken() {
  const refreshToken = localStorage.getItem('refreshToken');
  // 發(fā)送請(qǐng)求到后端，獲取新的Access Token
  fetch('/api/refreshToken', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ refreshToken })
  })
  .then(response => response.json())
  .then(data => {
    // 將新的Access Token更新到本地存儲(chǔ)中
    localStorage.setItem('accessToken', data.accessToken);
  })
  .catch(error => {
    console.error('刷新Token失?。?, error);
  });
}

function renewToken() {
  const accessToken = localStorage.getItem('accessToken');
  const expireTime = localStorage.getItem('expireTime');
  // 計(jì)算AccessToken的剩余有效時(shí)間
  const remainTime = expireTime - Date.now();
  // 如果AccessToken的剩余有效時(shí)間小于5分鐘，則發(fā)送續(xù)期請(qǐng)求
  if (remainTime < 5 * 60 * 1000) {
    // 發(fā)送續(xù)期請(qǐng)求到后端，更新AccessToken的過(guò)期時(shí)間
    fetch('/api/renewToken', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ accessToken })
    })
    .then(response => response.json())
    .then(data => {
      // 將新的過(guò)期時(shí)間更新到本地存儲(chǔ)中
      localStorage.setItem('expireTime', data.expireTime);
    })
    .catch(error => {
      console.error('續(xù)期Token失?。?, error);
    });
  }
}

// 定時(shí)檢查AccessToken的過(guò)期時(shí)間
setInterval(renewToken, 60 * 1000);