import { ApiError } from "@/lib/api";

/**
 * What to tell an editor when a call fails. German, one sentence, no status
 * codes up front - the code is appended for anything unexpected, so a
 * screenshot of the message is still useful to whoever debugs it.
 *
 * 401 is listed for completeness; callers should send the user to the login
 * page instead of showing it (see `isSessionExpired`).
 */
export const describeApiError = (error: unknown): string => {
  if (!(error instanceof ApiError)) {
    return "Unerwarteter Fehler. Bitte versuche es erneut.";
  }
  switch (error.status) {
    case 0:
      return "Keine Verbindung zum Server. Bitte prüfe deine Internetverbindung.";
    case 401:
      return "Deine Sitzung ist abgelaufen.";
    case 403:
      return "Dein Konto hat keine Berechtigung (mehr) für den Kalender.";
    case 200:
      // A 200 that the client decided was a failure (e.g. "0 rows were updated") carries its own German message.
      return error.message;
    default:
      return `Der Server hat einen Fehler gemeldet (${error.status}). Bitte versuche es erneut.`;
  }
};

/** Nobody is signed in any more - the one case worth a trip to the login page. */
export const isSessionExpired = (error: unknown): boolean => error instanceof ApiError && error.status === 401;