xianyan/lib/features/countdown/models/countdown_models.dart

/// ============================================================
/// 闲言APP — 倒计时数据模型
/// 创建时间: 2026-05-02
/// 更新时间: 2026-05-02
/// 作用: 倒计时事件模型 + 重复规则 + 分类
/// 上次更新: 初始创建
/// ============================================================

enum CountdownRepeat {
  none('不重复', '🔄'),
  daily('每天', '📅'),
  weekly('每周', '📆'),
  monthly('每月', '🗓️'),
  yearly('每年', '🎂');

  const CountdownRepeat(this.label, this.emoji);
  final String label;
  final String emoji;
}

enum CountdownCategory {
  festival('节日', '🎉'),
  birthday('生日', '🎂'),
  anniversary('纪念日', '💝'),
  exam('考试', '📝'),
  travel('旅行', '✈️'),
  deadline('截止日', '⏰'),
  custom('自定义', '📌');

  const CountdownCategory(this.label, this.emoji);
  final String label;
  final String emoji;
}

class CountdownEvent {
  const CountdownEvent({
    required this.id,
    required this.title,
    required this.targetDate,
    this.category = CountdownCategory.custom,
    this.repeat = CountdownRepeat.none,
    this.emoji = '📌',
    this.colorHex = '#FF6B6B',
    this.isPinned = false,
    this.createdAt,
  });

  final String id;
  final String title;
  final DateTime targetDate;
  final CountdownCategory category;
  final CountdownRepeat repeat;
  final String emoji;
  final String colorHex;
  final bool isPinned;
  final DateTime? createdAt;

  int get daysRemaining {
    final now = DateTime.now();
    final target = DateTime(targetDate.year, targetDate.month, targetDate.day);
    final today = DateTime(now.year, now.month, now.day);
    return target.difference(today).inDays;
  }

  bool get isPast => daysRemaining < 0;
  bool get isToday => daysRemaining == 0;

  String get remainingLabel {
    if (isToday) return '今天';
    if (isPast) return '已过 ${-daysRemaining} 天';
    return '$daysRemaining 天';
  }

  DateTime? get nextOccurrence {
    if (repeat == CountdownRepeat.none) return null;
    final now = DateTime.now();
    var next = targetDate;

    switch (repeat) {
      case CountdownRepeat.daily:
        if (next.isBefore(now)) {
          next = DateTime(now.year, now.month, now.day + 1);
        }
      case CountdownRepeat.weekly:
        while (next.isBefore(now)) {
          next = next.add(const Duration(days: 7));
        }
      case CountdownRepeat.monthly:
        while (next.isBefore(now)) {
          next = DateTime(next.year, next.month + 1, next.day);
        }
      case CountdownRepeat.yearly:
        while (next.isBefore(now)) {
          next = DateTime(next.year + 1, next.month, next.day);
        }
      case CountdownRepeat.none:
        return null;
    }
    return next;
  }

  Map<String, dynamic> toJson() => {
    'id': id,
    'title': title,
    'targetDate': targetDate.toIso8601String(),
    'category': category.name,
    'repeat': repeat.name,
    'emoji': emoji,
    'colorHex': colorHex,
    'isPinned': isPinned,
    'createdAt': createdAt?.toIso8601String(),
  };

  factory CountdownEvent.fromJson(Map<String, dynamic> json) =>
      CountdownEvent(
        id: json['id'] as String,
        title: json['title'] as String,
        targetDate: DateTime.parse(json['targetDate'] as String),
        category: CountdownCategory.values.firstWhere(
          (e) => e.name == json['category'],
          orElse: () => CountdownCategory.custom,
        ),
        repeat: CountdownRepeat.values.firstWhere(
          (e) => e.name == json['repeat'],
          orElse: () => CountdownRepeat.none,
        ),
        emoji: json['emoji'] as String? ?? '📌',
        colorHex: json['colorHex'] as String? ?? '#FF6B6B',
        isPinned: json['isPinned'] as bool? ?? false,
        createdAt: json['createdAt'] != null
            ? DateTime.parse(json['createdAt'] as String)
            : null,
      );

  CountdownEvent copyWith({
    String? id,
    String? title,
    DateTime? targetDate,
    CountdownCategory? category,
    CountdownRepeat? repeat,
    String? emoji,
    String? colorHex,
    bool? isPinned,
    DateTime? createdAt,
  }) {
    return CountdownEvent(
      id: id ?? this.id,
      title: title ?? this.title,
      targetDate: targetDate ?? this.targetDate,
      category: category ?? this.category,
      repeat: repeat ?? this.repeat,
      emoji: emoji ?? this.emoji,
      colorHex: colorHex ?? this.colorHex,
      isPinned: isPinned ?? this.isPinned,
      createdAt: createdAt ?? this.createdAt,
    );
  }
}