import axios from 'axios'

export type ApiErrorKind = 'auth' | 'forbidden' | 'validation' | 'conflict' | 'timeout' | 'server' | 'unknown'

export interface NormalizedApiError {
  kind: ApiErrorKind
  status?: number
  code?: number | string
  message: string
  unknownResult: boolean
}

const getResponse = (error: unknown) => (axios.isAxiosError(error) ? error.response : undefined)

export const normalizeApiError = (error: unknown): NormalizedApiError => {
  const response = getResponse(error)
  const status = response?.status
  const code = response?.data?.code
  const backendMessage = response?.data?.msg
  const timeout = axios.isAxiosError(error) && error.code === 'ECONNABORTED'

  if (timeout) {
    return { kind: 'timeout', status, code, message: '请求超时，结果可能未知，请刷新确认', unknownResult: true }
  }
  if (status === 401 || code === 401) return { kind: 'auth', status, code, message: '登录状态已失效，请重新登录', unknownResult: false }
  if (status === 403) return { kind: 'forbidden', status, code, message: '没有执行此操作的权限', unknownResult: false }
  if (status === 400) return { kind: 'validation', status, code, message: backendMessage || '请求参数或业务条件不符合要求', unknownResult: false }
  if (status === 409) return { kind: 'conflict', status, code, message: backendMessage || '数据已发生变化，请刷新后重试', unknownResult: false }
  if (status && status >= 500) return { kind: 'server', status, code, message: '服务器处理失败，请稍后重试', unknownResult: false }
  return { kind: 'unknown', status, code, message: backendMessage || '操作失败，请稍后重试', unknownResult: false }
}