import 'package:intl/intl.dart';

abstract final class AppDateUtils {
  static final _dateFormat = DateFormat('yyyy-MM-dd');
  static final _dateTimeFormat = DateFormat('yyyy-MM-dd HH:mm:ss');
  static final _timeFormat = DateFormat('HH:mm');
  static final _koreanDateFormat = DateFormat('yyyy년 MM월 dd일');

  static String formatDate(DateTime date) => _dateFormat.format(date);

  static String formatDateTime(DateTime date) => _dateTimeFormat.format(date);

  static String formatTime(DateTime date) => _timeFormat.format(date);

  static String formatKoreanDate(DateTime date) => _koreanDateFormat.format(date);

  static DateTime? tryParse(String? dateString) {
    if (dateString == null) return null;
    try {
      return DateTime.parse(dateString);
    } catch (_) {
      return null;
    }
  }

  static String timeAgo(DateTime date) {
    final now = DateTime.now();
    final diff = now.difference(date);

    if (diff.inDays > 365) {
      return '${diff.inDays ~/ 365}년 전';
    } else if (diff.inDays > 30) {
      return '${diff.inDays ~/ 30}개월 전';
    } else if (diff.inDays > 0) {
      return '${diff.inDays}일 전';
    } else if (diff.inHours > 0) {
      return '${diff.inHours}시간 전';
    } else if (diff.inMinutes > 0) {
      return '${diff.inMinutes}분 전';
    } else {
      return '방금 전';
    }
  }
}