using Aitex.Common.Util;
using Aitex.Core.Common.DeviceData;
using Aitex.Core.RT.DataCenter;
using Aitex.Core.RT.Device;
using Aitex.Core.RT.IOCore;
using Aitex.Core.RT.Log;
using Aitex.Core.RT.OperationCenter;
using Aitex.Core.Util;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Xml;

namespace MECF.Framework.Common.Device.Bases
{
    /// <summary>
    /// 信号塔对象。
    /// </summary>
    public class SignalTowerBase : BaseDevice, IDevice
    {
        #region Variables

        /// <summary>
        /// 是否关闭蜂鸣器输出。
        /// <value>True：蜂鸣器被手动关闭，满足事件条件也不要打开蜂鸣器。</value>
        /// <value>False：根据当前系统状态和配置事件自动输出蜂鸣器状态。</value>
        /// </summary>
        private bool _switchBuzzerOff;

        /// <summary>
        /// 信号塔事件字典，从配置文件中读取。
        /// </summary>
        private Dictionary<string, List<STEventAction>> _signalTowerEvent;
        
        /// <summary>
        /// 信号塔中组件字典。
        /// </summary>
        private readonly Dictionary<LightType, SignalTowerPartBase> _dicStParts;
        
        /// <summary>
        /// 信号塔组件动作字典。
        /// </summary>
        private Dictionary<LightType, STEventAction> _dicMergedActions;

        #endregion

        #region Constructors

        /// <summary>
        /// 构建信号塔对象的实例。
        /// </summary>
        /// <param name="module">当前模组名称。</param>
        /// <param name="node">设备配置文件。</param>
        /// <param name="ioModule">所属Module的名称。</param>
        public SignalTowerBase(string module, XmlElement node, string ioModule = "")
            : base(module, node, ioModule)
        {
            _dicStParts = new Dictionary<LightType, SignalTowerPartBase>();
            
            var doRedLight = ParseDoNode("doRed", node, ioModule);
            var doYellowLight = ParseDoNode("doYellow", node, ioModule);
            var doGreenLight = ParseDoNode("doGreen", node, ioModule);
            var doBlueLight = ParseDoNode("doBlue", node, ioModule);
            var doWhiteLight = ParseDoNode("doWhite", node, ioModule);
            var doBuzzer = ParseDoNode("doBuzzer", node, ioModule);
            var doBuzzer1 = ParseDoNode("doBuzzer1", node, ioModule);
            var doBuzzer2 = ParseDoNode("doBuzzer2", node, ioModule);
            var doBuzzer3 = ParseDoNode("doBuzzer3", node, ioModule);
            var doBuzzer4 = ParseDoNode("doBuzzer4", node, ioModule);
            var doBuzzer5 = ParseDoNode("doBuzzer5", node, ioModule);
            var aoBuzzerBlinkFreq = ParseAoNode("aoBuzzerBlinkFreq", node, ioModule);
            var eventFile = node.GetAttribute("eventFile");

            // 红、黄、绿、蜂鸣器是必须定义的元件。
            Debug.Assert(doRedLight != null, "DO RedLight is not valid");
            Debug.Assert(doYellowLight != null, "DO RedLight is not valid");
            Debug.Assert(doGreenLight != null, "DO RedLight is not valid");
            Debug.Assert(doBuzzer != null, "DO RedLight is not valid");

            // 创建三色灯控制元件。
            CreateSignalPart(LightType.Red, doRedLight);
            CreateSignalPart(LightType.Yellow, doYellowLight);
            CreateSignalPart(LightType.Green, doGreenLight);
            CreateSignalPart(LightType.Blue, doBlueLight);
            CreateSignalPart(LightType.White, doWhiteLight);
            CreateSignalPart(LightType.Buzzer, doBuzzer, aoBuzzerBlinkFreq);
            CreateSignalPart(LightType.Buzzer1, doBuzzer1);
            CreateSignalPart(LightType.Buzzer2, doBuzzer2);
            CreateSignalPart(LightType.Buzzer3, doBuzzer3);
            CreateSignalPart(LightType.Buzzer4, doBuzzer4);
            CreateSignalPart(LightType.Buzzer5, doBuzzer5);

            //解析三色灯Event
            ParseSignalTowerEvent(eventFile);
        }

        #endregion

        #region Properties

        /// <summary>
        /// 返回信号塔当前状态数据集。
        /// <remarks>该属性用于RT到UI间的数据传递。</remarks>
        /// </summary>
        public AITSignalTowerData DeviceData => new AITSignalTowerData
        {
            DeviceName = Name,
            DeviceSchematicId = DeviceID,
            DisplayName = Display,
            IsGreenLightOn = GetSignalTowerPartValue(LightType.Green),
            IsRedLightOn = GetSignalTowerPartValue(LightType.Red),
            IsYellowLightOn = GetSignalTowerPartValue(LightType.Yellow),
            IsBlueLightOn = GetSignalTowerPartValue(LightType.Blue),
            IsWhiteLightOn = GetSignalTowerPartValue(LightType.White),
            IsBuzzerOn = GetSignalTowerPartValue(LightType.Buzzer),
            IsBuzzer1On = GetSignalTowerPartValue(LightType.Buzzer1),
            IsBuzzer2On = GetSignalTowerPartValue(LightType.Buzzer2),
            IsBuzzer3On = GetSignalTowerPartValue(LightType.Buzzer3),
            IsBuzzer4On = GetSignalTowerPartValue(LightType.Buzzer4),
            IsBuzzer5On = GetSignalTowerPartValue(LightType.Buzzer5),
        };

        #endregion

        #region Methods

        /// <summary>
        /// 创建一个信号塔元件，并添加到字典中。
        /// </summary>
        /// <param name="light">信号塔元件类型，请参考<see cref="LightType"/>。</param>
        /// <param name="doSw">控制元件开关的DO。</param>
        /// <param name="aoBlinkFreq">控制Blink频率的AO。</param>
        private void CreateSignalPart(LightType light, DOAccessor doSw, AOAccessor aoBlinkFreq = null)
        {
            if (doSw != null)
                _dicStParts.Add(light, new SignalTowerPartBase(light, doSw, aoBlinkFreq));
        }

        /// <summary>
        /// 从指定的配置文件中解析信号塔事件。
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        private bool ParseSignalTowerEvent(string fileName)
        {
            try
            {
                var cFileName = PathManager.GetCfgDir() + fileName;
                if (!File.Exists(cFileName))
                {
                    LOG.Error($"Unable to find signal tower events config file {cFileName}.");
                    return false;
                }

                var stEvents = CustomXmlSerializer.Deserialize<STEvents>(new FileInfo(cFileName));
                stEvents.ParseEvents(out var events);
                if (events == null)
                    LOG.Error("Unable to parse the signal tower events from config file.");

                _signalTowerEvent = events;
                return _signalTowerEvent != null;
            }
            catch (Exception ex)
            {
                LOG.Error(ex.ToString());
                return false;
            }
        }
        
        /// <summary>
        /// 初始化信号塔对象实例。
        /// </summary>
        /// <remarks>
        /// 注册SwitchOffBuzzer操作和DeviceData数据。
        /// </remarks>
        /// <returns></returns>
        public bool Initialize()
        {
            OP.Subscribe($"{Module}.{Name}.{AITSignalTowerOperation.SwitchOffBuzzer}", SwitchOffBuzzer);
            DATA.Subscribe(Module + "." + Name + ".DeviceData", () => DeviceData);

            return true;
        }

        /// <summary>
        /// 复位信号塔状态及其各个组件。
        /// </summary>
        public void Reset()
        {
            _switchBuzzerOff = false;

            foreach (var light in _dicStParts.Values)
                light.Reset();
        }

        /// <summary>
        /// 终止信号塔对象实例。
        /// </summary>
        public void Terminate()
        {
            foreach (var light in _dicStParts.Values)
                light.Terminate();
        }

        /// <summary>
        /// 周期性扫描信号塔以执行后台任务。
        /// </summary>
        public void Monitor()
        {
            _dicMergedActions = _dicStParts.ToDictionary(
                x => x.Key, 
                v => v.Value.GetAction());

            // 遍历所有注册的事件，决定信号塔各元件的输出状态。
            foreach (var signalEvent in _signalTowerEvent)
            {
                var obj = DATA.Poll(signalEvent.Key);
                if(obj is not true)
                    continue;

                foreach (var newAction in signalEvent.Value)
                {
                    if (!_dicStParts.TryGetValue(newAction.Light, out var stPart))
                        continue;

                    // 根据当前设备状态，判断下一步信号组件的输出动作是什么
                    var mergedAction = MergeAction(_dicMergedActions[stPart.Light], newAction);
                    
                    _dicMergedActions[stPart.Light] = mergedAction;
                }
            }

            // 设置信号塔每个组件的输出。
            foreach (var action in _dicMergedActions)
            {
                // 创建一个动作副本，解决蜂鸣器被手动关闭后无法启用的问题
                var clonedAction = (STEventAction)action.Value?.Clone();
                if(clonedAction == null)
                    continue;
                
                // 如果蜂鸣器被强制关闭
                if (clonedAction.Light == LightType.Buzzer && _switchBuzzerOff)
                    clonedAction.Status = TowerLightStatus.Off;
                
                
                _dicStParts[action.Key].SetAction(clonedAction);
            }

            // 扫描信号塔组件状态
            foreach (var light in _dicStParts.Values)
                light?.Monitor();
        }

        /// <summary>
        /// 以指定的模式闪烁指定的信号塔元件。
        /// </summary>
        /// <param name="light">指定的信号塔元件。</param>
        /// <param name="pattern">闪烁模式。</param>
        /// <returns>True：启动闪烁成功；False：启动闪烁失败。</returns>
        public bool Blink(LightType light, STBlinkPattern pattern)
        {
            if (pattern == null)
            {
                LOG.Error($"{light} Blink Pattern can not be null");
                return false;
            }

            if (_dicStParts.TryGetValue(light, out var lightInstance))
            {
                // 强制使能蜂鸣器
                _switchBuzzerOff = false;
                lightInstance.SetAction(new STEventAction(lightInstance.Light, TowerLightStatus.Customized,
                    pattern));
                return true;
            }

            LOG.Error($"{light} Unable to find this part of signal tower, check configuration");
            return false;
        }
        
        /// <summary>
        /// 打开或关闭蜂鸣器。
        /// </summary>
        /// <param name="isOff"></param>
        /// <returns></returns>
        public bool SwitchOffBuzzer(bool isOff)
        {
            _switchBuzzerOff = isOff;
            return true;
        }

        /// <summary>
        /// 关闭蜂鸣器。
        /// </summary>
        /// <param name="arg1"></param>
        /// <param name="arg2"></param>
        /// <returns></returns>
        private bool SwitchOffBuzzer(string arg1, object[] arg2)
        {
            _switchBuzzerOff = true;
            return true;
        }

        /// <summary>
        /// 合并信号事件。
        /// <remarks>
        /// 根据<see cref="STEventAction.Status"/>的优先级决定执行的动作。
        /// <br/>
        /// 此属性的数值越小，表示优先级越高。
        /// </remarks>
        /// </summary>
        /// <param name="currentAction">当前输出状态。</param>
        /// <param name="nextAction">期望的输出状态。</param>
        /// <returns>合并后的信号灯输出状态。</returns>
        private STEventAction MergeAction(STEventAction currentAction, STEventAction nextAction)
        {
            if (currentAction == null)
                return nextAction;
            if (nextAction == null)
                return currentAction;

            // 获取当前动作的优先级
            var curPrior = currentAction.Status == TowerLightStatus.Customized
                ? currentAction.BlinkPattern.Priority
                : (int)currentAction.Status;

            // 获取下一个动作的优先级
            var nextPrior = nextAction.Status == TowerLightStatus.Customized
                ? nextAction.BlinkPattern.Priority
                : (int)nextAction.Status;


            return curPrior < nextPrior ? currentAction : nextAction;
        }

        /// <summary>
        /// 获取指定信号塔元件的输出状态。
        /// </summary>
        /// <param name="light"></param>
        /// <returns></returns>
        private bool  GetSignalTowerPartValue(LightType light)
        {
            if (_dicStParts.TryGetValue(light, out var part))
                return part.GetValue();

            return false;
        }

        #endregion

    }



}