using FATrace.Com;
using HslCommunication;
using HslCommunication.Profinet.Keyence;
using NLog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FATrace.OEMApp.Services
{
    public class PLCDataService
    {
        /// <summary>
        /// 日志
        /// </summary>
        private Logger Logger { get; set; } = LogManager.GetCurrentClassLogger();

        public PLCDataService()
        {
            PLCLinkInitial();
            StartPlcScan();

            PadCodeAddress= ConfigHelper.GetStringOrDefault("PDAScanCode", "D1050");
        }

        /// <summary>
        /// PAD地址
        /// </summary>
        private string PadCodeAddress { get; set; }

        /// <summary>
        /// 扫码事件
        /// </summary>
        public event EventHandler<string> ScanCodeEventHandler;

        /// <summary>
        /// PLC连接状态事件
        /// </summary>
        public event EventHandler<string> PlcConnectedEventHandler;

        /// <summary>
        /// 基恩士通信组件
        /// </summary>
        private KeyenceMcNet KeyencePlcMcNet { get; set; } = null;

        private bool _PlcConnected;
        /// <summary>
        /// PLC连接状态
        /// </summary>
        public bool PlcConnected
        {
            get { return _PlcConnected; }
            set
            {
                if (_PlcConnected != value)
                {
                    if (value)
                    {
                        if (PlcConnectedEventHandler != null) PlcConnectedEventHandler.Invoke(this, "OK");
                    }
                    else
                    {
                        if (PlcConnectedEventHandler != null) PlcConnectedEventHandler.Invoke(this, "NG");
                    }
                    _PlcConnected = value;
                }
            }
        }


        private string _ScanCode = string.Empty;
        /// <summary>
        /// 扫描结果
        /// </summary>
        public string ScanCode
        {
            get { return _ScanCode; }
            set
            {
                if (_ScanCode != value)
                {
                    if (!string.IsNullOrEmpty(value))
                    {
                        if (ScanCodeEventHandler != null) ScanCodeEventHandler.Invoke(this, value);
                    }
                    else
                    {
                        Logger.Error($"PLC条码数据为空: 数据改变但是数据为空");
                    }

                    _ScanCode = value;
                }

            }
        }

        /// <summary>
        /// 扫描结果
        /// </summary>
        private OperateResult<string> OperateResultPDAScanCode { get; set; }

        // 扫描控制
        private CancellationTokenSource? _plcScanCts;
        private Task? _plcScanTask;
        private volatile bool _isScanning = false;
        public bool IsScanning => _isScanning;
        private bool _disposed = false;

        /// <summary>
        /// PLC通信初始化
        /// </summary>
        /// <param name="PLCIp"></param>
        /// <param name="Port"></param>
        private void PLCLinkInitial()
        {
            try
            {
                // 读取 PLC 配置（大小写敏感，采用公共 ConfigHelper 并提供默认值）
                string PLCIP = ConfigHelper.GetStringOrDefault("PLCIP", "192.0.1.10");
                int Port = ConfigHelper.GetIntOrDefault("PLCPort", 5000);

                //PLC通信的连接
                KeyencePlcMcNet = new KeyenceMcNet();
                KeyencePlcMcNet.IpAddress = PLCIP;
                KeyencePlcMcNet.Port = Port;
                KeyencePlcMcNet.ConnectClose();

                KeyencePlcMcNet.ConnectTimeOut = 3000; // 连接3秒超时
                OperateResult connect = KeyencePlcMcNet.ConnectServer();
                if (connect.IsSuccess)//初始连接状态的显示判断
                {
                    Console.WriteLine($"PLC-连接 OK");
                    PlcConnected = true;
                }
                else
                {
                    MessageBox.Show(connect.Message + Environment.NewLine + "ErrorCode: " + connect.ErrorCode);
                    PlcConnected = false;
                }
            }
            catch (Exception ex)
            {
                Logger.Error(String.Format("ErrSource : {0} ErrMsg : {1}", ex.StackTrace.ToString(), ex.Message.ToString()));
                //insertLogToDBDelegate.BeginInvoke(1, "UpdateUIMethod异常", ex.Message.ToString() + ex.StackTrace.Substring(ex.StackTrace.Length - 40, 40), null, null);
                PlcConnected = false;
            }

        }

        /// <summary>
        /// 启动PLC扫描。若已在扫描则忽略重复启动。
        /// </summary>
        /// <param name="scanPeriod">扫描周期，若为 null 则读取 App.config 的 PLCScan（毫秒），默认600ms</param>
        /// <param name="externalToken">可选：外部取消令牌，用于联动取消</param>
        public void StartPlcScan(TimeSpan? scanPeriod = null, CancellationToken externalToken = default)
        {
            if (_isScanning) return;

            var period = scanPeriod ?? ConfigHelper.GetTimeSpanOrDefault("PLCScan", TimeSpan.FromMilliseconds(600));

            _plcScanCts = CancellationTokenSource.CreateLinkedTokenSource(externalToken);
            var token = _plcScanCts.Token;
            _isScanning = true;

            _plcScanTask = Task.Run(() => PlcScanLoopAsync(period, token), token);
        }

        /// <summary>
        /// 停止PLC扫描，等待后台任务结束。
        /// </summary>
        public async Task StopPlcScanAsync()
        {
            try
            {
                if (_plcScanCts != null)
                {
                    _plcScanCts.Cancel();
                }
                if (_plcScanTask != null)
                {
                    try { await _plcScanTask.ConfigureAwait(false); } catch { /* ignore */ }
                }
            }
            finally
            {
                _isScanning = false;
                _plcScanTask = null;
                _plcScanCts?.Dispose();
                _plcScanCts = null;
            }
        }

        /// <summary>
        /// 扫描循环：按周期轮询PLC寄存器并更新模型。
        /// - 读取配置项 Addr_WeightPhotoEnable（默认 M100）为布尔量
        /// - 读失败时尝试重连一次
        /// </summary>
        private async Task PlcScanLoopAsync(TimeSpan period, CancellationToken token)
        {
            string addrWeight = ConfigHelper.GetStringOrDefault("Addr_WeightPhotoEnable", "M100");
            bool? lastWeight = null;

            while (!token.IsCancellationRequested)
            {
                try
                {
                    if (KeyencePlcMcNet == null)
                    {
                        PLCLinkInitial();
                    }

                    //内包扫码
                    OperateResultPDAScanCode = KeyencePlcMcNet!.ReadString(PadCodeAddress, 40);
                    if (OperateResultPDAScanCode.IsSuccess)
                    {
                        //ScanCode = RevData(OperateResultPDAScanCode.Content).Replace("\r", "").Replace("\n", "").Replace("\0", "").Trim();
                        ScanCode = (OperateResultPDAScanCode.Content).Replace("\r", "").Replace("\n", "").Replace("\0", "").Trim();
                        PlcConnected = true;
                    }
                    else
                    {
                        PlcConnected = false;
                    }
                }
                catch (OperationCanceledException)
                {
                    break;
                }
                catch (Exception ex)
                {
                    Logger.Error($"PLC 扫描异常: {ex}");
                }
                finally
                {
                    try
                    {
                        await Task.Delay(period, token).ConfigureAwait(false);
                    }
                    catch (OperationCanceledException)
                    {
                        // 不允许从 finally 中 break/return，
                        // 这里吞掉异常，循环将在下一次 while 判断时依据 token 自动退出
                    }
                }
            }
            _isScanning = false;
        }

        /// <summary>
        /// 尝试重连 PLC（快速一次）
        /// </summary>
        private async Task TryReconnectAsync(CancellationToken token)
        {
            try
            {
                if (KeyencePlcMcNet == null) { PLCLinkInitial(); return; }
                KeyencePlcMcNet.ConnectClose();
                await Task.Delay(100, token).ConfigureAwait(false);
                KeyencePlcMcNet.ConnectTimeOut = 3000;
                var ret = KeyencePlcMcNet.ConnectServer();
                if (!ret.IsSuccess)
                {
                    Logger.Warn($"PLC重连失败: {ret.Message} (Code: {ret.ErrorCode})");
                    PlcConnected = false;
                }
                else { PlcConnected = true; }
            }
            catch (Exception ex)
            {
                Logger.Error($"PLC重连异常: {ex.Message}");
                PlcConnected = false;
            }
        }

        /// <summary>
        /// 释放资源，确保扫描停止并断开PLC连接。
        /// </summary>
        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;
            try
            {
                // 停止扫描
                try { StopPlcScanAsync().GetAwaiter().GetResult(); } catch { }

                // 解除事件订阅（当前未订阅自定义事件，保留占位以便后续扩展）
                // try { /* no event to unsubscribe */ } catch { }

                // 关闭PLC连接
                try { KeyencePlcMcNet?.ConnectClose(); } catch { }
            }
            finally
            {
                KeyencePlcMcNet = null;
            }
        }

        /// <summary>
        /// 把字符串对调
        /// </summary>
        public string RevData(string Code)
        {
            // 需求：PLC 字符串按“字”(2字节)进行高低字节对调，导致 ABCDEF -> BADCFE
            // 纠正方式：按两个字符一组交换顺序，奇数长度保留最后一个字符
            if (string.IsNullOrEmpty(Code)) return string.Empty;

            // 去掉读取中可能包含的 '\0' 空字符
            var src = Code.Replace("\0", string.Empty);

            var sb = new System.Text.StringBuilder(src.Length);
            for (int i = 0; i < src.Length; i += 2)
            {
                if (i + 1 < src.Length)
                {
                    sb.Append(src[i + 1]);
                    sb.Append(src[i]);
                }
                else
                {
                    // 奇数长度，最后一个字符原样保留
                    //sb.Append((char)0x0);
                    sb.Append('\0');
                    sb.Append(src[i]);
                }
            }

            return sb.ToString();
        }



    }



}