using System;

namespace MoviconHub.App.Models
{
    /// <summary>
    /// 清洗动作
    /// </summary>
    public class ClearAction
    {

        /// <summary>
        /// 清洗事件
        /// </summary>
        public event EventHandler<string> ClearActionEvent;

        /// <summary>
        /// 设备状态改变事件
        /// </summary>
        public event EventHandler<StateInfo> DeviceStateChangeEvent;


        // 状态变更并发锁：确保在多线程环境下，状态切换与事件发布的原子性，避免竞态条件
        private readonly object _stateLock = new object();
        // 是否已存在当前状态：用于首次赋值时不发布“上一状态”事件的标记
        private bool _hasCurrentState = false;

        private bool _ClearEnd;
        /// <summary>
        /// 清洗完成信号
        /// </summary>
        public bool ClearEnd
        {
            get { return _ClearEnd; }
            set
            {
                if (_ClearEnd != value)
                {
                    _ClearEnd = value;
                    //清洗完成
                    if (_ClearEnd)
                    {
                        ClearActionEvent.BeginInvoke(this, "清洗完成", null, null);
                    }
                }
            }
        }



        private bool _DeviceClose;
        /// <summary>
        /// 设备关机信号
        /// </summary>
        public bool DeviceClose
        {
            get { return _DeviceClose; }
            set
            {
                if (_DeviceClose != value)
                {
                    _DeviceClose = value;
                    //清洗完成
                    if (_DeviceClose)
                    {
                        ClearActionEvent.BeginInvoke(this, "设备关机", null, null);
                    }
                }
            }
        }

        /// <summary>
        /// 当前状态信息
        /// </summary>
        public StateInfo CurStateInfo { get; set; } = new StateInfo();

        private int _DeviceState;
        /// <summary>
        /// 设备状态
        /// </summary>
        public int DeviceState
        {
            get { return _DeviceState; }
            set
            {
                if (_DeviceState != value)
                {
                    lock (_stateLock)
                    {
                        var now = DateTime.Now;

                        // 若已有当前状态，先发布上一个状态的维持区间
                        if (_hasCurrentState)
                        {
                            var prevStateInfo = new StateInfo
                            {
                                StartTime = CurStateInfo.StartTime,
                                EndTime = now,
                                State = CurStateInfo.State
                            };

                            var handler = DeviceStateChangeEvent;
                            handler?.BeginInvoke(this, prevStateInfo, null, null);
                        }

                        // 更新为新的当前状态
                        _DeviceState = value;
                        CurStateInfo = new StateInfo
                        {
                            StartTime = now,
                            EndTime = default, // 结束时间在下次状态变化时确定
                            State = value
                        };
                        _hasCurrentState = true;
                    }
                }

            }
        }
    }

    /// <summary>
    /// 状态信息
    /// </summary>
    public class StateInfo
    {
        /// <summary>
        /// 开始时间
        /// </summary>
        public DateTime StartTime { get; set; }

        /// <summary>
        /// 结束时间
        /// </summary>
        public DateTime EndTime { get; set; }
        
    /// <summary>
    /// 值
    /// </summary>
        public int State { get; set; }
    }
}