/**
 * Transport envelope shared by feature slices that call the generated Alova
 * client. Mirrors the backend convention:
 * `code == HTTP status`, payload in `data`, detail in `error`.
 */
export interface ApiEnvelope<T> {
  code: number
  message: string
  data?: T | null
  error?: string | null
  error_code?: string | null
}

export class ApiFailure extends Error {
  readonly code: number
  readonly errorCode?: string | null

  constructor(message: string, code: number, errorCode?: string | null) {
    super(message)
    this.name = 'ApiFailure'
    this.code = code
    this.errorCode = errorCode
  }
}

export async function unwrapApi<T>(method: PromiseLike<ApiEnvelope<T>>): Promise<T> {
  const res = await method
  if (res.code !== 200) {
    throw new ApiFailure(res.error || res.message || 'request failed', res.code, res.error_code)
  }
  return res.data as T
}