/// 设备运行状态
///
/// 与下位机 `device_info.task_status` 字段对齐：
/// - `running` 运行中
/// - `pause`   暂停
/// - `idle`    空闲
enum DeviceTaskStatus { running, pause, idle }

/// 设备门状态
///
/// 与下位机 `device_info.door_status` 字段对齐：
/// - `open`  开
/// - `close` 关
enum DeviceDoorStatus { open, close }

/// 设备灯光状态
///
/// 与下位机 `device_info.light_status` / `light_control.status` 字段对齐：
/// - `on`  开
/// - `off` 关
enum DeviceLightStatus { on, off }

/// 上位机内部统一的设备状态模型
///
/// 既承载 [DeviceState]（运行态监控），也承载下位机 `device_info` 上报
/// 的门状态 / 灯光状态 / 任务状态，供 UI 各处订阅展示与联动。
class DeviceState {
  /// 本机内部识别的运行状态（用于驱动运行/暂停/完成流程）
  final DeviceStatus status;

  /// 当前运行程序名（仅运行态有效）
  final String? currentProgram;

  /// 当前步骤的孔位（例如 A1）
  final String? currentPosition;

  /// 当前步骤号
  final int? currentStepNo;

  /// 当前步骤名
  final String? currentStepName;

  /// 当前步骤剩余时间（秒）
  final int? remainingSeconds;

  /// 总进度 [0, 1]
  final double? progress;

  /// 灯光状态（来自 device_info，主动权在下位机）
  final DeviceLightStatus lightStatus;

  /// 门状态（来自 device_info）
  final DeviceDoorStatus doorStatus;

  /// 任务状态（来自 device_info）
  final DeviceTaskStatus taskStatus;

  /// 上次 device_info 上报的时间，便于 UI 显示「通讯正常 / 已断开」
  final DateTime? lastInfoAt;

  const DeviceState({
    this.status = DeviceStatus.idle,
    this.currentProgram,
    this.currentPosition,
    this.currentStepNo,
    this.currentStepName,
    this.remainingSeconds,
    this.progress,
    this.lightStatus = DeviceLightStatus.off,
    this.doorStatus = DeviceDoorStatus.close,
    this.taskStatus = DeviceTaskStatus.idle,
    this.lastInfoAt,
  });

  bool get isRunning => status == DeviceStatus.running;
  bool get isPaused => status == DeviceStatus.paused;
  bool get isIdle => status == DeviceStatus.idle;
  bool get hasError => status == DeviceStatus.error;

  bool get lightingOn => lightStatus == DeviceLightStatus.on;
  bool get doorOpen => doorStatus == DeviceDoorStatus.open;

  /// 下位机超过该时间未上报则视为通讯异常
  static const Duration infoStaleAfter = Duration(seconds: 10);

  bool get infoStale {
    final ts = lastInfoAt;
    if (ts == null) return true;
    return DateTime.now().difference(ts) > infoStaleAfter;
  }

  String statusText() {
    switch (status) {
      case DeviceStatus.running:
        return '运行中';
      case DeviceStatus.paused:
        return '已暂停';
      case DeviceStatus.error:
        return '错误';
      case DeviceStatus.idle:
        return '未运行';
    }
  }

  String formatRemainingTime() {
    if (remainingSeconds == null) return '--:--:--';
    final hours = remainingSeconds! ~/ 3600;
    final minutes = (remainingSeconds! % 3600) ~/ 60;
    final seconds = remainingSeconds! % 60;
    return '${hours.toString().padLeft(2, '0')}:'
        '${minutes.toString().padLeft(2, '0')}:'
        '${seconds.toString().padLeft(2, '0')}';
  }

  DeviceState copyWith({
    DeviceStatus? status,
    String? currentProgram,
    String? currentPosition,
    int? currentStepNo,
    String? currentStepName,
    int? remainingSeconds,
    double? progress,
    DeviceLightStatus? lightStatus,
    DeviceDoorStatus? doorStatus,
    DeviceTaskStatus? taskStatus,
    DateTime? lastInfoAt,
    bool clearProgram = false,
    bool clearProgress = false,
  }) {
    return DeviceState(
      status: status ?? this.status,
      currentProgram: clearProgram ? null : (currentProgram ?? this.currentProgram),
      currentPosition: currentPosition ?? this.currentPosition,
      currentStepNo: currentStepNo ?? this.currentStepNo,
      currentStepName: currentStepName ?? this.currentStepName,
      remainingSeconds: remainingSeconds ?? this.remainingSeconds,
      progress: clearProgress ? null : (progress ?? this.progress),
      lightStatus: lightStatus ?? this.lightStatus,
      doorStatus: doorStatus ?? this.doorStatus,
      taskStatus: taskStatus ?? this.taskStatus,
      lastInfoAt: lastInfoAt ?? this.lastInfoAt,
    );
  }
}

/// 简单的状态枚举（与 [DeviceState.status] 配合使用）
enum DeviceStatus { idle, running, paused, error }