// What went wrong, in words to show a person, from whichever layer failed.
//
// The two backends reject differently: the REST client with an `ApiError`
// (`{ error, status }`), a Tauri command with the plain string its Rust `Err` held.
// A catch that reads only `.error` turns every desktop failure into its generic
// fallback — "Could not upload file." when the store said exactly why.

export function errorMessage(e: unknown, fallback: string): string {
  if (typeof e === "string" && e.trim()) return e;
  if (e && typeof e === "object") {
    const { error, message } = e as { error?: unknown; message?: unknown };
    if (typeof error === "string" && error.trim()) return error;
    if (typeof message === "string" && message.trim()) return message;
  }
  return fallback;
}