/** A catalog effort list is authoritative; null means model metadata is unavailable. */
export function nextModelEffort(
  available: readonly string[] | null,
  current: string | null,
  profileDefault: string | null,
  sameProfile: boolean,
): string | null {
  if (available === null) return sameProfile ? current : (profileDefault ?? current);
  if (!available.length) return null;
  if (current && available.includes(current)) return current;
  if (profileDefault && available.includes(profileDefault)) return profileDefault;
  if (available.includes('medium')) return 'medium';
  return available[0];
}