// device.dart — 已登录设备(GET /v1/me/devices)。
class Device {
  const Device({
    required this.uuid,
    required this.name,
    required this.platform,
    this.lastSeen,
    this.clientVersion = '',
    this.online = false,
    this.lastLogin,
  });

  final String uuid;
  final String name;

  /// 'ios' | 'android' | 'windows' | 'macos' | 'linux'。
  final String platform;

  /// 最近活跃(UTC);从未上线为 null。
  final DateTime? lastSeen;

  /// 客户端版本(该设备最近上报),可能为空。
  final String clientVersion;

  /// 在线(数据面活跃,last_seen 在阈值内,由服务端判定)。
  final bool online;

  /// 最后登录时间(最近一次会话创建,UTC);无会话为 null。
  final DateTime? lastLogin;

  factory Device.fromJson(Map<String, dynamic> m) {
    DateTime? parseTs(String key) {
      final s = m[key] as String?;
      return (s != null && s.isNotEmpty) ? DateTime.tryParse(s) : null;
    }

    return Device(
      uuid: m['uuid'] as String? ?? '',
      name: m['name'] as String? ?? '',
      platform: m['platform'] as String? ?? '',
      lastSeen: parseTs('last_seen'),
      clientVersion: m['client_version'] as String? ?? '',
      online: m['online'] as bool? ?? false,
      lastLogin: parseTs('last_login'),
    );
  }
}