/**
 * The NPI route answers `503 { reason: 'npi-registry-unavailable' }` when the national registry could not be reached.
 * That attempt claimed and wrote nothing, so it is a definite answer rather than a save that may have landed. Keyed on
 * the code, never the sentence; any other 503 (a gateway, or one sent after the record was written) may have saved.
 */
const NPI_REGISTRY_UNAVAILABLE = 'npi-registry-unavailable';

export const FRESH_REGISTRY_OUTAGE_NOTICE =
    'We could not check that NPI with the national registry just now, so it was not saved. Please try again in a few minutes.';

export const HELD_REGISTRY_OUTAGE_NOTICE =
    'We could not check that NPI with the national registry just now. Your earlier save of it may still have gone through; try again in a few minutes.';

export const isNpiRegistryUnavailable = (error: unknown): boolean => {
    const candidate = error as
        | { status?: number; statusCode?: number; body?: { reason?: unknown }; response?: { status?: number } }
        | null
        | undefined;
    const status = candidate?.status ?? candidate?.statusCode ?? candidate?.response?.status;
    return status === 503 && candidate?.body?.reason === NPI_REGISTRY_UNAVAILABLE;
};