import { ElMessage, ElTreeSelect } from 'element-plus';
import axios, { AxiosInstance, AxiosError, AxiosRequestConfig, InternalAxiosRequestConfig, AxiosResponse } from 'axios'
import { showFullScreenLoading, tryHideFullScreenLoading } from '@/components/Loading/fullScreen'
import { LOGIN_URL } from '@/config'
import { ElMessage } from 'element-plus'
import { ResultData } from '@/api/interface'
import { ResultEnum } from '@/enums/httpEnum'
import { checkStatus } from './helper/checkStatus'
import { useUserStore } from '@/stores/modules/user'
import router from '@/routers'
import {refreshToken} from '@/api/user/login'

export interface CustomAxiosRequestConfig extends InternalAxiosRequestConfig {
  loading?: boolean;
}

const config = {
  // 默认地址请求地址，可在 .env.** 文件中修改
  baseURL: import.meta.env.VITE_API_URL as string,
  // 设置超时时间
  timeout: ResultEnum.TIMEOUT as number,
  // 跨域时候允许携带凭证
  withCredentials: true,
  // post请求指定数据类型以及编码
  headers: { 'Content-Type': 'application/json;charset=utf-8' },
}

class RequestHttp {
  service: AxiosInstance

  public constructor(config: AxiosRequestConfig) {
    // 创建实例
    this.service = axios.create(config)

    /**
     * @description 请求拦截器
     * 客户端发送请求 -> [请求拦截器] -> 服务器
     * token校验(JWT) : 接受服务器返回的 token,存储到 vuex/pinia/本地储存当中
     */
    this.service.interceptors.request.use(
      (config: CustomAxiosRequestConfig) => {
          isFirst = true
        const userStore = useUserStore()
        // 当前请求不需要显示 loading，在 api 服务中通过指定的第三个参数: { loading: false } 来控制
        config.loading ?? (config.loading = true)
        config.loading && showFullScreenLoading()
        if (config.headers && typeof config.headers.set === 'function') {
          config.headers.set('Authorization', 'Bearer ' + userStore.accessToken)
          config.headers.set('Is-Refresh-Token', userStore.isRefreshToken+"")
        }
        return config
      },
      (error: AxiosError) => {
        return Promise.reject(error)
      },
    )

    let isFirst = true
    /**
     * @description 响应拦截器
     *  服务器换返回信息 -> [拦截统一处理] -> 客户端JS获取到信息
     */
    this.service.interceptors.response.use(
      async (response: AxiosResponse) => {
        const { data } = response
        const userStore = useUserStore()
        tryHideFullScreenLoading()

        if(data.code === ResultEnum.ACCESSTOKEN_EXPIRED){
            // 用长token去换短token
            userStore.setAccessToken(userStore.refreshToken)
            userStore.setIsRefreshToken(true)
            const result = await refreshToken()
            if (result) { //获取新token成功的话
              // 有新的token后，重新请求
              userStore.setAccessToken(result.data.accessToken)
              userStore.setRefreshToken(result.data.refreshToken)
                userStore.setIsRefreshToken(false)
              response.config.headers.Authorization = `Bearer ${result.data.accessToken}`//重新请求前需要将更新后的新token更换掉之前无效的token,不然会死循环
              const resp = await this.service.request(response.config)
              return resp
            } else {
              // 刷新失效，跳转登录页
            }
         }
        // 登陆失效
        if (data.code == ResultEnum.OVERDUE) {
          console.log("登陆失效")
          userStore.setAccessToken('')
          userStore.setRefreshToken('')
            userStore.setIsRefreshToken(false)
          userStore.setUserInfo({ name: '' })
          await router.replace(LOGIN_URL)
            if(isFirst){//临时处理token失效弹窗多次
            ElMessage.error(data.message)
            isFirst = false
          }
          return Promise.reject(data)
        }
        // 全局错误信息拦截（防止下载文件的时候返回数据流，没有 code 直接报错）
        if (data.code && data.code !== ResultEnum.SUCCESS) {
          if(data.message.includes('&')){
            const formattedMessage = data.message.split('&').join('<br>');
            ElMessage.error({ message: formattedMessage, dangerouslyUseHTMLString: true });
            return Promise.reject(data)
          }  
          ElMessage.error(data.message)
          return Promise.reject(data)
        }
        // 成功请求（在页面上除非特殊情况，否则不用处理失败逻辑）
        return data
      },
      async (error: AxiosError) => {
        const { response } = error
        tryHideFullScreenLoading()
        console.log('error', error.message)
        // 请求超时 && 网络错误单独判断，没有 response
        if (error.message.indexOf('timeout') !== -1) ElMessage.error('请求超时！请您稍后重试')
        if (error.message.indexOf('Network Error') !== -1) ElMessage.error('网络错误！请您稍后重试')
        // 根据服务器响应的错误状态码，做不同的处理
        if (response) checkStatus(response.status)
        // 服务器结果都没有返回(可能服务器错误可能客户端断网)，断网处理:可以跳转到断网页面
        if (!window.navigator.onLine) router.replace('/500')
        return Promise.reject(error)
      },
    )
  }

  /**
   * @description 常用请求方法封装
   */
  get<T>(url: string, params?: object, _object = {}): Promise<ResultData<T>> {
    return this.service.get(url, { params, ..._object })
  }

  post<T>(url: string, params?: object | string, _object = {}): Promise<ResultData<T>> {
    return this.service.post(url, params, _object)
  }

  put<T>(url: string, params?: object, _object = {}): Promise<ResultData<T>> {
    return this.service.put(url, params, _object)
  }

  delete<T>(url: string, params?: any, _object = {}): Promise<ResultData<T>> {
    return this.service.delete(url, { params, ..._object })
  }

  download(url: string, params?: object, _object = {}): Promise<BlobPart> {
    return this.service.post(url, params, { ..._object, responseType: 'blob' })
  }

  upload(url: string, params?: object, _object = {}): Promise<BlobPart> {
    return this.service.post(url, params, {
      ..._object,
      headers: { 'Content-Type': 'multipart/form-data' }
    })
  }

  /**
   * 针对excel的上传，默认返回的是blob类型，Excel没问题时返回json特殊处理
   */
  uploadExcel(url: string, params?: object, _object = {}): Promise<BlobPart> {
    return this.service.post(url, params, {
      ..._object,
      headers: { 'Content-Type': 'multipart/form-data' },
      responseType: 'blob',
    })
  }


}

export default new RequestHttp(config)
