export type AdminPageAuthorizationStatus = 401 | 403 | 503;

export type AdminPageAccessFailure =
  | { kind: "login"; location: "/login" }
  | { kind: "forbidden"; status: 403; message: string }
  | { kind: "unavailable"; status: 503; message: string; location: "/admin-unavailable" };

export function resolveAdminPageAccessFailure(
  status: AdminPageAuthorizationStatus,
): AdminPageAccessFailure {
  if (status === 401) {
    return { kind: "login", location: "/login" };
  }
  if (status === 403) {
    return { kind: "forbidden", status, message: "无权访问后台" };
  }
  return {
    kind: "unavailable",
    status,
    message: "后台服务暂时不可用",
    location: "/admin-unavailable",
  };
}