export const SISTER_EMOJIS: Record<string, string> = {
  harang: '🦊',
  narang: '🦊',
  darang: '🐱',
  erang: '🐺',
};

export const SISTER_DISPLAY_NAMES: Record<string, string> = {
  harang: '하랑이',
  narang: '나랑이',
  darang: '다랑이',
  erang: '이랑이',
};

export const SISTER_ROLES: Record<string, string> = {
  harang: 'Orchestrator',
  narang: 'Generator',
  darang: 'Evaluator',
  erang: 'Infra Manager',
};

export function formatLastSeen(lastSeen: string | Date | null | undefined): string {
  if (!lastSeen) return '기록 없음';
  const d = typeof lastSeen === 'string' ? new Date(lastSeen) : lastSeen;
  const diff = Date.now() - d.getTime();
  const min = Math.floor(diff / 60000);
  if (min < 1) return '방금 전';
  if (min < 60) return `${min}분 전`;
  const hr = Math.floor(min / 60);
  if (hr < 24) return `${hr}시간 전`;
  return `${Math.floor(hr / 24)}일 전`;
}