// Memory only: a cold start begins a new login session. Never persist this in storage.
const seen = new Map();
function shouldShow(notice, userId) {
  if (!notice || !notice.enabled || !String(notice.content || '').trim()) return false;
  const mode = notice.mode || 'login_once';
  if (mode === 'off') return false;
  if (mode === 'always') return true;
  return mode === 'login_once' && seen.get(String(userId || '')) !== notice.revision;
}
function markShown(notice, userId) {
  if (notice && (notice.mode || 'login_once') === 'login_once') seen.set(String(userId || ''), notice.revision);
}
function clear() { seen.clear(); }
module.exports = { shouldShow, markShown, clear };