import { env, TIMEOUT } from '@/common/env.uts'
import { logout } from '@/store/user.uts'

export type ApiResponse<T> = {
  code : number
  message : string
  data : T | null
}

export type RequestOptions = {
  url : string
  method ?: string
  data ?: UTSJSONObject | null
  header ?: UTSJSONObject | null
  showLoading ?: boolean
}

function getToken() : string {
  const token = uni.getStorageSync('token')
  if (token == null) return ''
  return token as string
}

function toastError(msg : string) : void {
  uni.showToast({ title: msg, icon: 'none' })
}

function handleUnauthorized() : void {
  logout()
  toastError('登录已失效，请重新登录')
  uni.reLaunch({ url: '/pages/mine/mine' })
}

export function request<T>(options : RequestOptions) : Promise<T> {
  return new Promise<T>((resolve, reject) => {
    const header : UTSJSONObject = options.header ?? {}
    header['Content-Type'] = 'application/json'
    const token = getToken()
    if (token.length > 0) {
      header['Authorization'] = 'Bearer ' + token
    }

    if (options.showLoading == true) {
      uni.showLoading({ title: '加载中...' })
    }

    uni.request({
      url: env.baseUrl + options.url,
      method: options.method ?? 'GET',
      data: options.data,
      header: header,
      timeout: TIMEOUT,
      success: (res) => {
        if (options.showLoading == true) {
          uni.hideLoading()
        }
        const statusCode = res.statusCode
        if (statusCode == 401 || statusCode == 403) {
          handleUnauthorized()
          reject(new Error('登录已失效'))
          return
        }
        if (statusCode >= 200 && statusCode < 300) {
          const body = res.data
          if (body == null || !(body instanceof UTSJSONObject)) {
            reject(new Error('响应格式错误'))
            return
          }
          const json = body as UTSJSONObject
          const code = json.getNumber('code')
          if (code == null) {
            resolve(json as T)
            return
          }
          if (code == 200) {
            resolve(json.get('data') as T)
          } else {
            const msg = json.getString('message') ?? '请求失败'
            toastError(msg)
            reject(new Error(msg))
          }
        } else {
          const msg = '网络错误 ' + statusCode
          toastError(msg)
          reject(new Error(msg))
        }
      },
      fail: (err) => {
        if (options.showLoading == true) {
          uni.hideLoading()
        }
        const msg = err.errMsg != null && err.errMsg.length > 0 ? err.errMsg : '请求失败'
        toastError(msg)
        reject(new Error(msg))
      }
    })
  })
}

export function get<T>(url : string, data ?: UTSJSONObject | null) : Promise<T> {
  return request<T>({ url: url, method: 'GET', data: data })
}

export function post<T>(url : string, data ?: UTSJSONObject | null) : Promise<T> {
  return request<T>({ url: url, method: 'POST', data: data })
}

export function put<T>(url : string, data ?: UTSJSONObject | null) : Promise<T> {
  return request<T>({ url: url, method: 'PUT', data: data })
}

export function del<T>(url : string, data ?: UTSJSONObject | null) : Promise<T> {
  return request<T>({ url: url, method: 'DELETE', data: data })
}