import { v4 as uuid_v4 } from 'uuid'
import { FetchClient, type FetchResponse } from './fetchClient'
import { useUserStore } from '@/stores/user'
import { jumpToSignin } from '@/utils/casdoor/casdoor'
import { refreshToken } from './auth'

const baseUrl = import.meta.env.BASE_URL

export interface Response<T = any> {
  code: number
  message: string
  data: T
  traceId: string
  timestamp: number
}

const http = new FetchClient(baseUrl + 'api', 60 * 1000) // 超时时间设置为60s

let isRefreshing = false
let pendingQueue: (() => void)[] = []

async function handleTokenExpired(
  response: FetchResponse<Response<any>>,
): Promise<FetchResponse<Response<any>>> {
  if (!('retry' in response)) {
    return response
  }

  // 原始请求包装成函数
  const originalRequest = response.retry
  if (originalRequest === undefined) {
    return response
  }

  // 如果已经在刷新，挂起请求
  if (isRefreshing) {
    return new Promise<FetchResponse<Response<any>>>((resolve, reject) => {
      pendingQueue.push(() => originalRequest().then(resolve).catch(reject))
    })
  }

  isRefreshing = true

  try {
    // 调用刷新接口
    const res = await refreshToken()

    const userStore = useUserStore()
    userStore.setToken(res)

    // 刷新完成，重放队列请求
    await Promise.all(pendingQueue.map((fn) => fn()))
    pendingQueue = []

    // 重新执行当前请求
    return originalRequest()
  } catch (err) {
    handleRefreshFailed()
    throw err
  } finally {
    isRefreshing = false
  }
}

function handleRefreshFailed() {
  const userStore = useUserStore()
  userStore.setToken(undefined)
  pendingQueue = []
  isRefreshing = false

  console.log('jumpToSignin')

  // 跳转登录页
  jumpToSignin()
}

// 设置拦截器（可选）
http.setRequestInterceptor((config) => {
  const userStore = useUserStore()
  // 自动加 token
  const token = userStore.token
  if (token) {
    config.headers = {
      ...config.headers,
      Authorization: `Bearer ${token}`,
      'X-Trace-Id': uuid_v4(),
    }
  }
  return config
})

http.setResponseInterceptor(async (response: FetchResponse<Response<any>>): Promise<any> => {
  // 全局响应处理，比如统一格式校验
  if (!response.ok) {
    console.log({ response })
    switch (response.status) {
      case 401: // Unauthorized Token过期
        // 刷新Token
        response = await handleTokenExpired(response)
        if (!response.ok) {
          console.log({ response })
          throw new Error(response.data)
        }
        break
      case 403: // Forbidden 刷新Token失败
        // 重新登录
        handleRefreshFailed()
        break
      case 204: // No Content
        break
      default:
        console.log({ response })
        throw new Error(response.data)
    }
    return response.data
  }
  return response.data.data
})

export default http