import axios, { AxiosInstance, AxiosResponse } from 'axios'
import { store } from '../store'
import { clearCredentials, setCredentials } from '../store/slices/authSlice'

let isRefreshing = false
let pendingQueue: Array<(token: string) => void> = []

const instance: AxiosInstance = axios.create({
  baseURL: '/api',
  timeout: 10000
})

instance.interceptors.request.use(config => {
  const token = store.getState().auth.accessToken
  if (token) {
    config.headers.Authorization = `Bearer ${token}`
  }
  return config
})

instance.interceptors.response.use(
  (response: AxiosResponse) => {
    const data = response.data
    if (data.code !== undefined && data.code !== 200) {
      return Promise.reject(new Error(data.message || '请求失败'))
    }
    return data.data
  },
  async error => {
    const originalRequest = error.config
    if (error.response?.status === 401 && !originalRequest._retry) {
      originalRequest._retry = true
      const refreshToken = store.getState().auth.refreshToken
      if (!refreshToken) {
        store.dispatch(clearCredentials())
        window.location.href = '/login'
        return Promise.reject(error)
      }
      if (isRefreshing) {
        return new Promise(resolve => {
          pendingQueue.push((token: string) => {
            originalRequest.headers.Authorization = `Bearer ${token}`
            resolve(instance(originalRequest))
          })
        })
      }
      isRefreshing = true
      try {
        const res = await axios.post('/api/auth/refresh', { refreshToken })
        const newToken = res.data.data.accessToken
        store.dispatch(setCredentials({
          accessToken: newToken,
          refreshToken,
          userInfo: store.getState().auth.userInfo!
        }))
        pendingQueue.forEach(cb => cb(newToken))
        pendingQueue = []
        originalRequest.headers.Authorization = `Bearer ${newToken}`
        return instance(originalRequest)
      } catch {
        store.dispatch(clearCredentials())
        window.location.href = '/login'
        return Promise.reject(error)
      } finally {
        isRefreshing = false
      }
    }
    return Promise.reject(error)
  }
)

export default instance