using System;
using System.Security.Cryptography.X509Certificates;
using System.Threading;
using System.Threading.Tasks;
using DOAN.Infrastructure.PLC;
using DOAN.Model.PBL;
using DOAN.Model.System;
using Microsoft.Extensions.Hosting;
using SqlSugar;
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 CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
        private Task _executingTask;
        private PLCTool pLCTool;

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

            pLCTool.ConnectPLC();
            // 当服务开始时，启动后台任务
            _executingTask = ExecuteAsync(_cancellationTokenSource.Token);



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

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

            // 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.");
            }

            // 创建一个掩码，其中只有要检查的那一位是1
            byte mask = (byte)(1 << position);

            // 使用按位与运算符(&)来检查该位是否为1
            bool isSet = (b & mask) != 0;

            // 返回取反后的值
            return !isSet;
        }

        /// <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个数组
                    byte[] plcSensorValues = pLCTool.ReadAllValue("VB100", 12);

                    // 获取所有料架层
                    List<Storagelocation> storagelocationList = await DbScoped.SugarScope.CopyNew().Queryable<Storagelocation>().ToListAsync();

                    // 获取点位表
                    List<PlcAddressTable> pointPositionList = await DbScoped.SugarScope.CopyNew().Queryable<PlcAddressTable>().ToListAsync();

                    List<Storagelocation> updateStoragelocationList = [];
                    List<Inventorylog> inventoryLogs = [];

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

                        if (layerPoints != null && layerPoints.Count > 0)
                        {
                            int currentPackageCount = 0; // 默认最小值为0

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

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

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

                    // 更新库存
                    if (updateStoragelocationList.Count > 0)
                    {
                        await DbScoped.SugarScope.CopyNew().Updateable(updateStoragelocationList).ExecuteCommandAsync();
                    }

                    // 插入库存变更日志
                    if (inventoryLogs.Count > 0)
                    {
                        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>
        /// 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;

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

            inventoryLogs.Add(inventoryLog);
        }

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

        }



    }
}