// 用户设置数据模型 — 手写不可变类（避免 build_runner 依赖）

/// 主题模式 — 与系统设置同步
enum ThemeMode { light, dark, system }

/// 默认画笔类型（复用 StrokeModel 中的枚举值）
enum DefaultBrushType {
  pen('pen'),
  pencil('pencil'),
  marker('marker');

  const DefaultBrushType(this.value);
  final String value;
}

/// 用户设置 — 持久化的个人偏好
///
/// 存储用户的主题偏好、默认画笔、字体大小等。
/// 每个用户只有一条设置记录，通过 [userId] 关联。
class UserSettings {
  final String id;
  final String userId;
  final ThemeMode theme;
  final DefaultBrushType defaultBrushType;
  final String defaultBrushColor;
  final double fontSize;
  final DateTime createdAt;
  final DateTime updatedAt;

  const UserSettings({
    required this.id,
    required this.userId,
    this.theme = ThemeMode.system,
    this.defaultBrushType = DefaultBrushType.pen,
    this.defaultBrushColor = '#2D2420',
    this.fontSize = 16.0,
    required this.createdAt,
    required this.updatedAt,
  });

  UserSettings copyWith({
    String? id,
    String? userId,
    ThemeMode? theme,
    DefaultBrushType? defaultBrushType,
    String? defaultBrushColor,
    double? fontSize,
    DateTime? createdAt,
    DateTime? updatedAt,
  }) =>
      UserSettings(
        id: id ?? this.id,
        userId: userId ?? this.userId,
        theme: theme ?? this.theme,
        defaultBrushType: defaultBrushType ?? this.defaultBrushType,
        defaultBrushColor: defaultBrushColor ?? this.defaultBrushColor,
        fontSize: fontSize ?? this.fontSize,
        createdAt: createdAt ?? this.createdAt,
        updatedAt: updatedAt ?? this.updatedAt,
      );

  Map<String, dynamic> toJson() => {
        'id': id,
        'user_id': userId,
        'theme': theme.name,
        'default_brush_type': defaultBrushType.value,
        'default_brush_color': defaultBrushColor,
        'font_size': fontSize,
        'created_at': createdAt.toIso8601String(),
        'updated_at': updatedAt.toIso8601String(),
      };

  factory UserSettings.fromJson(Map<String, dynamic> json) => UserSettings(
        id: json['id'] as String,
        userId: json['user_id'] as String,
        theme: ThemeMode.values.firstWhere(
          (t) => t.name == json['theme'],
          orElse: () => ThemeMode.system,
        ),
        defaultBrushType: DefaultBrushType.values.firstWhere(
          (b) => b.value == json['default_brush_type'],
          orElse: () => DefaultBrushType.pen,
        ),
        defaultBrushColor:
            (json['default_brush_color'] as String?) ?? '#2D2420',
        fontSize: (json['font_size'] as num?)?.toDouble() ?? 16.0,
        createdAt: DateTime.parse(json['created_at'] as String),
        updatedAt: DateTime.parse(json['updated_at'] as String),
      );

  /// 创建默认设置的工厂方法
  factory UserSettings.create({
    required String userId,
    ThemeMode theme = ThemeMode.system,
  }) {
    final now = DateTime.now();
    return UserSettings(
      id: userId,
      userId: userId,
      theme: theme,
      createdAt: now,
      updatedAt: now,
    );
  }
}