using CapMachine.Wpf.CanDrive;
using CapMachine.Wpf.Models.HighSpeed;
using Prism.Ioc;
using Prism.Mvvm;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Channels;
using System.Threading.Tasks;
using System.Windows.Threading;

namespace CapMachine.Wpf.Services
{
    /// <summary>
    /// 高速驱动消息服务
    /// 负载高速的驱动数据的消息和转发
    /// </summary>
    public class HightDriveMsgService : BindableBase
    {

        #region 字段和属性

        private readonly ILogService LogService;

        /// <summary>
        /// 接收数据Channel
        /// </summary>
        private readonly Channel<CommMsg> ReceiveChannel;

        /// <summary>
        /// 转发数据Channel
        /// </summary>
        private readonly Channel<CommMsg> ForwardChannel;

        /// <summary>
        /// 取消令牌
        /// </summary>
        private CancellationTokenSource TaskCancellationTokenSource;

        /// <summary>
        /// 数据接受处理任务
        /// </summary>
        private Task ProcessTask;
        /// <summary>
        /// 数据转发处理任务
        /// </summary>
        private Task ForwardTask;

        /// <summary>
        /// 显示的消息集合
        /// </summary>
        public ObservableCollection<CommMsg> DisplayMessages { get; set; } = new ObservableCollection<CommMsg>();

        /// <summary>
        /// 最大显示消息数量
        /// </summary>
        public int MaxDisplayCount { get; set; } = 200;

        /// <summary>
        /// 是否启用CAN报文显示
        /// </summary>
        private bool _IsDisplayEnabled = true;
        public bool IsDisplayEnabled
        {
            get { return _IsDisplayEnabled; }
            set
            {
                SetProperty(ref _IsDisplayEnabled, value);
                if (!value)
                {
                    // 不显示时清空数据节省内存
                    App.Current.Dispatcher.Invoke(() => DisplayMessages.Clear());
                }
            }
        }

        /// <summary>
        /// 是否启用CAN数据转发
        /// </summary>
        private bool _IsForwardEnabled;
        public bool IsForwardEnabled
        {
            get { return _IsForwardEnabled; }
            set { SetProperty(ref _IsForwardEnabled, value); }
        }

        #endregion

        #region 构造和初始化

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="containerProvider">容器服务提供者</param>
        /// <param name="logService">日志服务</param>
        public HightDriveMsgService(ILogService logService)
        {
            LogService = logService;

            // 创建接收Channel，设置容量和溢出策略
            ReceiveChannel = Channel.CreateBounded<CommMsg>(new BoundedChannelOptions(100000)
            {
                FullMode = BoundedChannelFullMode.DropOldest, // 满时删除旧数据
                SingleReader = true,                          // 单一读取者
                SingleWriter = false                          // 允许多个写入者
            });

            // 创建转发Channel
            ForwardChannel = Channel.CreateBounded<CommMsg>(new BoundedChannelOptions(100000)
            {
                FullMode = BoundedChannelFullMode.DropOldest,
                SingleReader = true,
                SingleWriter = false
            });

            // 初始化服务
            Initialize();
        }

        /// <summary>
        /// 初始化服务
        /// </summary>
        private void Initialize()
        {
            TaskCancellationTokenSource = new CancellationTokenSource();

            // 启动数据处理任务
            ProcessTask = Task.Run(ProcessMessagesAsync);

            // 启动数据转发任务
            ForwardTask = Task.Run(ForwardMessagesAsync);

            //LogService.Info("HightDriveMsgService初始化完成");
        }

        #endregion

        #region 公共方法

        /// <summary>
        /// 添加CAN消息进行处理
        /// </summary>
        /// <param name="message">CAN消息</param>
        /// <returns>是否添加成功</returns>
        public async Task<bool> AddMessageAsync(CommMsg message)
        {
            if (message == null) return false;

            try
            {
                if (IsDisplayEnabled)
                {
                    // 添加到接收Channel
                    await ReceiveChannel.Writer.WriteAsync(message, TaskCancellationTokenSource.Token);
                }


                // 如果启用转发，也添加到转发Channel 需要判断目标的CAN是否已经打开，如果打开的话，则转发数据
                if (IsForwardEnabled)
                {
                    await ForwardChannel.Writer.WriteAsync(message, TaskCancellationTokenSource.Token);
                }

                return true;
            }
            catch (OperationCanceledException)
            {
                return false;
            }
            catch (Exception ex)
            {
                LogService.Error($"添加CAN消息失败: {ex.Message}");
                return false;
            }
        }

        /// <summary>
        /// 批量添加CAN消息
        /// </summary>
        /// <param name="messages">消息集合</param>
        /// <returns>成功添加的消息数量</returns>
        public async Task<int> AddMessagesAsync(IEnumerable<CommMsg> messages)
        {
            if (messages == null) return 0;

            int successCount = 0;
            foreach (var message in messages)
            {
                if (await AddMessageAsync(message))
                {
                    successCount++;
                }
            }

            return successCount;
        }

        /// <summary>
        /// 设置转发目标CAN设备
        /// </summary>
        /// <param name="targetDevice">目标设备</param>
        public void SetForwardTarget(ToomossCan targetDevice)
        {
            //_targetCanDevice = targetDevice;
            LogService.Info($"设置转发目标设备: {(targetDevice != null ? "成功" : "未设置")}");
        }

        /// <summary>
        /// 清空显示消息
        /// </summary>
        public void ClearDisplayMessages()
        {
            App.Current.Dispatcher.Invoke(() => DisplayMessages.Clear());
        }

        #endregion


        #region 私有方法

        /// <summary>
        /// 批量处理消息提高效率
        /// </summary>
        private List<CommMsg> MessageBatch { get; set; } = new List<CommMsg>();

        /// <summary>
        /// 接受的批次数量
        /// </summary>
        private int ReciveBatchCount { get; set; }

        /// <summary>
        /// 转发的批次数量
        /// </summary>
        private int ForwardBatchCount { get; set; }

        /// <summary>
        /// 异步处理接收到的消息
        /// </summary>
        private async Task ProcessMessagesAsync()
        {

            while (await ReceiveChannel.Reader.WaitToReadAsync(TaskCancellationTokenSource.Token))
            {

                try
                {
                    // 清空列表但保留容量
                    MessageBatch.Clear();

                    // 读取最多100条消息或直到没有更多消息
                    ReciveBatchCount = 0;
                    while (ReciveBatchCount < 30 && ReceiveChannel.Reader.TryRead(out CommMsg message))
                    {
                        MessageBatch.Add(message);
                        ReciveBatchCount++;
                    }

                    if (MessageBatch.Count > 0 && IsDisplayEnabled)
                    {
                        // 在UI线程更新显示
                        await App.Current.Dispatcher.InvokeAsync(() =>
                        {
                            foreach (var msg in MessageBatch)
                            {
                                DisplayMessages.Add(msg);

                                // 控制显示消息数量
                                while (DisplayMessages.Count > MaxDisplayCount)
                                {
                                    DisplayMessages.RemoveAt(0);
                                }
                            }
                        }, DispatcherPriority.Background);
                    }

                    // 避免CPU过度使用
                    if (ReciveBatchCount == 0)
                    {
                        await Task.Delay(20);
                    }
                }
                catch (OperationCanceledException ex)
                {
                    // 服务被取消，正常退出
                    LogService.Error($" 服务被取消，正常退出: {ex.Message}");
                }
                catch (Exception ex)
                {
                    LogService.Error($"消息处理任务异常: {ex.Message}");
                }

            }

        }

        /// <summary>
        /// 异步转发消息
        /// </summary>
        private async Task ForwardMessagesAsync()
        {
            try
            {
                while (await ForwardChannel.Reader.WaitToReadAsync(TaskCancellationTokenSource.Token))
                {
                    //// 只有在启用转发且目标设备可用时才处理 && _targetCanDevice != null && _targetCanDevice.OpenState
                    //if (IsForwardEnabled)
                    //{
                    //    // 批量收集转发消息
                    //    List<USB2CAN.CAN_MSG> canMessages = new List<USB2CAN.CAN_MSG>();
                    //    ForwardBatchCount = 0;

                    //    // 一次最多处理50条消息
                    //    while (ForwardBatchCount < 50 && ForwardChannel.Reader.TryRead(out CommMsg message))
                    //    {
                    //        if (message.Category == "CAN" && !string.IsNullOrEmpty(message.MsgInfo))
                    //        {
                    //            try
                    //            {
                    //                // 转换为CAN_MSG格式
                    //                USB2CAN.CAN_MSG canMsg = new USB2CAN.CAN_MSG();
                    //                canMsg.Data = new byte[64];

                    //                // 解析CAN ID
                    //                string msgIdHex = message.MsgInfo.Replace("0x", "");
                    //                canMsg.ID = Convert.ToUInt32(msgIdHex, 16);

                    //                // 解析数据
                    //                string[] dataBytes = message.MsgData.Split('-');
                    //                canMsg.DataLen = (byte)dataBytes.Length;

                    //                for (int i = 0; i < dataBytes.Length && i < 64; i++)
                    //                {
                    //                    canMsg.Data[i] = Convert.ToByte(dataBytes[i], 16);
                    //                }

                    //                canMessages.Add(canMsg);
                    //            }
                    //            catch (Exception ex)
                    //            {
                    //                LogService.Error($"转换CAN消息格式失败: {ex.Message}");
                    //            }
                    //        }

                    //        ForwardBatchCount++;
                    //    }

                    //    // 批量发送转发消息
                    //    if (canMessages.Count > 0)
                    //    {
                    //        //// 在这里调用设备API发送消息
                    //        //int sendResult = USB2CAN.CAN_SendMsg(
                    //        //    _targetCanDevice.DevHandle,
                    //        //    _targetCanDevice.WriteCANIndex,
                    //        //    canMessages.ToArray(),
                    //        //    (uint)canMessages.Count);

                    //        //if (sendResult < 0)
                    //        //{
                    //        //    LogService.Error($"CAN消息转发失败: 错误码={sendResult}");
                    //        //}
                    //        //else
                    //        //{
                    //        //    LogService.Debug($"成功转发{sendResult}条CAN消息");
                    //        //}
                    //    }
                    //}
                    //else
                    //{
                    //    // 不转发时，清空队列减少内存占用
                    //    while (ForwardChannel.Reader.TryRead(out _)) { }
                    //    await Task.Delay(10);
                    //}
                }
            }
            catch (OperationCanceledException)
            {
                // 服务被取消，正常退出
            }
            catch (Exception ex)
            {
                LogService.Error($"消息转发任务异常: {ex.Message}");
            }
        }

        #endregion

        #region IDisposable 实现

        /// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose()
        {
            try
            {
                // 发送取消信号
                TaskCancellationTokenSource?.Cancel();

                // 等待任务完成
                Task.WaitAll(new[] { ProcessTask, ForwardTask }, 1000);
            }
            catch { /* 忽略取消异常 */ }
            finally
            {
                // 释放资源
                TaskCancellationTokenSource?.Dispose();
                TaskCancellationTokenSource = null;

                // 完成写入器，表示不再接受新数据
                ReceiveChannel.Writer.Complete();
                ForwardChannel.Writer.Complete();

                // 清空显示数据
                App.Current.Dispatcher.Invoke(() => DisplayMessages.Clear());



                LogService.Info("HightDriveMsgService资源已释放");
            }
        }

        #endregion

    }
}