import 'package:intl/intl.dart';

String formatChatTime(DateTime time) {
  final now = DateTime.now();
  final t = time.toLocal();

  final today = DateTime(now.year, now.month, now.day);
  final d = DateTime(t.year, t.month, t.day);

  final diff = today.difference(d).inDays;
  final hm = DateFormat('HH:mm').format(t);

  if (diff == 0) return hm;
  if (diff == 1) return '昨天 $hm';

  // 本周
  if (diff < 7 && d.weekday <= now.weekday) {
    return '${DateFormat('EEEEE', 'zh_CN').format(t)} $hm';
  }

  if (t.year == now.year) {
    return DateFormat('M月d日 HH:mm').format(t);
  }

  return DateFormat('yyyy年M月d日 HH:mm').format(t);
}