using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using DOAN.Infrastructure.PLC;
using DOAN.Model.PBL;
using DOAN.ServiceCore.Signalr;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Hosting;
using SqlSugar.IOC;

namespace DOAN.ServiceCore
{
    /// <summary>
    /// 永驻线程
    /// 功能：检测传感器信号，判断箱子数
    /// </summary>
    public class DoanBackgroundService : IHostedService, IDisposable
    {
        private readonly IHubContext<PBLhub> notificationHubContext;
        private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
        private Task _executingTask;
        private PLCTool pLCTool;
        private List<Storagelocation> storagelocationList = new List<Storagelocation>();
        private List<PlcAddressTable> pointPositionList = new List<PlcAddressTable>();
        private Timer refreshTimer;

        public DoanBackgroundService(IHubContext<PBLhub> hubContext)
        {
            notificationHubContext = hubContext;
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            pLCTool = new PLCTool();
            pLCTool.ConnectPLC();

            // 初始化料架层和点位表数据
            RefreshData(null);

            // 启动后台任务
            _executingTask = ExecuteAsync(_cancellationTokenSource.Token);

            // 设置定时器每分钟刷新一次料架层和点位表
            refreshTimer = new Timer(RefreshData, null, TimeSpan.Zero, TimeSpan.FromMinutes(1));

            return _executingTask.IsCompleted ? _executingTask : Task.CompletedTask;
        }

        public async Task StopAsync(CancellationToken cancellationToken)
        {
            // 请求取消后台任务
            _cancellationTokenSource.Cancel();

            // 停止定时器
            refreshTimer?.Change(Timeout.Infinite, Timeout.Infinite);
            refreshTimer?.Dispose();

            // 等待后台任务完成
            await Task.WhenAny(_executingTask, Task.Delay(Timeout.Infinite, cancellationToken));
        }

        private static bool GetInvertedBit(byte b, int position)
        {
            if (position < 0 || position > 7)
            {
                throw new ArgumentOutOfRangeException(nameof(position), "Position must be between 0 and 7.");
            }

            byte mask = (byte)(1 << position);
            bool isSet = (b & mask) != 0;
            return !isSet; // 返回取反后的值
        }

        /// <summary>
        /// 功能：检测传感器信号，判断箱子数并更新库存及日志
        /// </summary>
        /// <param name="stoppingToken">取消令牌</param>
        /// <returns></returns>
        private async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            try
            {
                while (!stoppingToken.IsCancellationRequested)
                {
                    // 读取PLC I/O状态（12个字节）
                    byte[] plcSensorValues;
                    try
                    {
                        plcSensorValues = pLCTool.ReadAllValue("VB100", 12);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"读取PLC数据异常: {ex.Message}\n堆栈跟踪: {ex.StackTrace}");
                        continue;
                    }

                    var updateStoragelocationList = new List<Storagelocation>();
                    var inventoryLogs = new List<Inventorylog>();

                    foreach (var layerItem in storagelocationList)
                    {
                        // 获取这个料架层的点位表
                        var layerPoints = pointPositionList.Where(it => it.FkStorageId == layerItem.Id).ToList();

                        if (layerPoints.Any())
                        {
                            int currentPackageCount = 0; // 默认最小值为0

                            foreach (var point in layerPoints)
                            {
                                int row = point.ByteNum - 100;
                                int col = point.BitNum - 1;

                                if (plcSensorValues != null && row >= 0 && row < plcSensorValues.Length)
                                {
                                    currentPackageCount += GetInvertedBit(plcSensorValues[row], col) ? 1 : 0;
                                }
                            }

                            // 检查箱子数量变化并记录日志
                            int previousPackageCount = layerItem.PackageNum.GetValueOrDefault();
                            if (currentPackageCount > previousPackageCount)
                            {
                                UpdateAndLog(layerItem, currentPackageCount, 2, "出库", inventoryLogs);
                                updateStoragelocationList.Add(layerItem);
                            }
                            else if (currentPackageCount < previousPackageCount)
                            {
                                UpdateAndLog(layerItem, currentPackageCount, 1, "入库", inventoryLogs);
                                updateStoragelocationList.Add(layerItem);
                            }

                            // 补料报警触发
                            if (layerItem.IsLackAlarm == 1 && currentPackageCount <= layerItem.AlarmNum.GetValueOrDefault())
                            {
                                var alarmData = new
                                {
                                    RackCode = layerItem.RackCode,
                                    LayerNum = layerItem.LayerNum,
                                    CurrentPackageCount = currentPackageCount,
                                    AlarmThreshold = layerItem.AlarmNum
                                };

                                string alarmMessage = System.Text.Json.JsonSerializer.Serialize(alarmData);
                                await notificationHubContext.Clients.All.SendAsync("PBL_lack_alarm", alarmMessage);
                            }
                        }
                    }

                    // 更新库存
                    if (updateStoragelocationList.Any())
                    {
                        await DbScoped.SugarScope.CopyNew().Updateable(updateStoragelocationList).ExecuteCommandAsync();
                        // 发送库存变更Socket通知
                        string changeMessage = "库存变动";
                        await notificationHubContext.Clients.All.SendAsync("PBL_storagelocation_change", changeMessage);
                    }

                    // 插入库存变更日志
                    if (inventoryLogs.Any())
                    {
                        await DbScoped.SugarScope.CopyNew().Insertable(inventoryLogs).ExecuteCommandAsync();
                    }
                    // 添加延迟以避免频繁查询
                    await Task.Delay(200, stoppingToken);
                }
            }
            catch (OperationCanceledException)
            {
                Console.WriteLine("任务已取消");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"DoanBackGround线程ExecuteAsync异常: {ex.Message}\n堆栈跟踪: {ex.StackTrace}");
            }
        }

        /// <summary>
        /// 刷新料架层和点位表数据
        /// </summary>
        /// <param name="state"></param>
        private void RefreshData(object state)
        {
            try
            {
                using (var scope = DbScoped.SugarScope.CopyNew())
                {
                    storagelocationList = scope.Queryable<Storagelocation>().ToListAsync().Result;
                    pointPositionList = scope.Queryable<PlcAddressTable>().ToListAsync().Result;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"刷新数据异常: {ex.Message}\n堆栈跟踪: {ex.StackTrace}");
                // 如果刷新失败，保持现有数据不变
            }
        }

        /// <summary>
        /// 更新料架位置的箱子数量并记录库存日志
        /// </summary>
        /// <param name="storageLocation">料架位置对象</param>
        /// <param name="newPackageCount">新的箱子数量</param>
        /// <param name="operation">操作类型 (1-出库, 2-入库)</param>
        /// <param name="operatorName">操作员名称</param>
        /// <param name="inventoryLogs">库存日志列表</param>
        private void UpdateAndLog(
            Storagelocation storageLocation,
            int newPackageCount,
            int operation,
            string operatorName,
            List<Inventorylog> inventoryLogs)
        {
            storageLocation.PackageNum = newPackageCount;
            storageLocation.UpdatedBy = operatorName;
            storageLocation.UpdatedTime = DateTime.Now;

            var inventoryLog = new Inventorylog
            {
                Id = SnowFlakeSingle.Instance.NextId().ToString(),
                RackCode = storageLocation.RackCode,
                Partnumber = storageLocation.Partnumber,
                Operation = operation,
                PackageNum = Math.Abs(newPackageCount - storageLocation.PackageNum.GetValueOrDefault()),
                CreatedBy = operatorName,
                CreatedTime = DateTime.Now.ToLocalTime()
            };

            inventoryLogs.Add(inventoryLog);
        }

        public void Dispose()
        {
            try
            {
                pLCTool.ConnectClose();
                _cancellationTokenSource.Cancel();
                _executingTask?.Wait();
                _cancellationTokenSource.Dispose();
                refreshTimer?.Change(Timeout.Infinite, Timeout.Infinite);
                refreshTimer?.Dispose();
            }
            catch (Exception ex)
            {
                Console.WriteLine("DoanBackGround线程Dispose异常:" + ex.Message);
            }
        }
    }
}