using ModbusDemo.Device;
using ModbusDemo.Event;
using ModbusDemo.Model;
using ModbusDemo.Uitls;
using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace ModbusDemo.VIewModel
{
    /// <summary>
    /// 这是CoilUC的VM用来支持数据绑定
    /// </summary>
    public class CoilUCViewModel : BindableBase,IDisposable
    {
        // 标记是否已释放资源
        private bool _disposed = false;
        //事件聚合器
        private readonly IEventAggregator _eventAggregator;
        //定义数据库操作
        private ModbusDbContext _modbusDbContext;
        //获取读线圈的类
        private IModbusRTU _modbusRTU;
        //定义读线圈的命令
        public DelegateCommand ReadCoilCmm { get; set; }
        //定义写线圈操作
        public DelegateCommand WriteCoilCmm { get; set; }
        //获取当前使用的串口
        private SerialPort _serialPort;
        //显示当前链接串口的信息

        //按钮是否可以点击
        private bool _isEnable;

        public bool IsEnable
        {
            get { return _isEnable; }
            set
            {
                _isEnable = value;
                RaisePropertyChanged();
            }
        }
        
        public  string SerialPortInfo
        {
            get
            {
                return "当前为读写线圈：" + "串口号：" + _serialPort.PortName + "，波特率：" + _serialPort.BaudRate
                    + "，数据位：" + _serialPort.DataBits + "，校验位：" + _serialPort.Parity + "，停止位：" + _serialPort.StopBits;
            }

        }

        

        #region 读取定义

        //读取的从站id
        private string _slaveAddress;

        public string SlaveAddress
        {
            get { return _slaveAddress; }
            set
            {
                _slaveAddress = value;
                RaisePropertyChanged();
            }
        }
        //读取的起始地址
        private string _startAddress;


        public string StartAddress
        {
            get { return _startAddress; }
            set
            {
                _startAddress = value;
                RaisePropertyChanged();
            }
        }
        //读取的位数
        private string _numberOfPoints;


        public string NumberOfPoints
        {
            get { return _numberOfPoints; }
            set
            {
                _numberOfPoints = value;
                RaisePropertyChanged();
            }
        }

        private string _readResult;

        //读取的结果
        public string ReadResult
        {
            get { return _readResult; }
            set
            {
                _readResult = value;
                RaisePropertyChanged();
            }
        }
        #endregion

        #region 写入定义

        //写入的从站id
        private string _writeslaveAddress;

        public string WriteSlaveAddress
        {
            get { return _writeslaveAddress; }
            set
            {
                _writeslaveAddress = value;
                RaisePropertyChanged();
            }
        }
        //写入的起始地址
        private string _writestartAddress;


        public string WriteStartAddress
        {
            get { return _writestartAddress; }
            set
            {
                _writestartAddress = value;
                RaisePropertyChanged();
            }
        }
        //写入的数据
        private string _writeData;


        public string WriteData
        {
            get { return _writeData; }
            set
            {
                _writeData = value;

            }
        }


        #endregion


        private List<ModbusLog> _modbusLogList;

        public List<ModbusLog> ModbusLogList
        {
            get { return _modbusLogList; }
            set
            {
                _modbusLogList = value;
                RaisePropertyChanged();
            }
        }

        public CoilUCViewModel()
        {

        }

        public CoilUCViewModel(SerialPort serialPort, ModbusRTU modbusRTU, ModbusDbContext modbusDbContext, IEventAggregator eventAggregator)
        {
            _serialPort = serialPort;
            ReadCoilCmm = new DelegateCommand(ReadCoil);
            _modbusRTU = modbusRTU;
            WriteCoilCmm = new DelegateCommand(WriteCoil);
            _modbusDbContext = modbusDbContext;
            _eventAggregator = eventAggregator;
            // 订阅事件（使用弱引用，避免内存泄漏）
            _eventAggregator.GetEvent<SerialPortSettingsChangedEvent>().Subscribe(
                OnSerialPortSettingsChanged,
                ThreadOption.UIThread,  // 在UI线程执行回调
                false);// 不使用强引用
            //初始化查询操作
            ModbusLogList = GetOperateCoil();
            IsEnable = true;
        }
        // 事件回调方法：当串口设置变更时触发
        private void OnSerialPortSettingsChanged()
        {
            // 强制刷新SerialPortInfo属性，触发UI更新
            RaisePropertyChanged(nameof(SerialPortInfo));
        }
        /// <summary>
        /// 线圈读取操作
        /// </summary>
        private void ReadCoil()
        {
            //检测当前输入的信息是否正确
            var validation = CheckInputUitl.ValidateReadParameters(SlaveAddress, StartAddress, NumberOfPoints);
            if (!validation.success)
            {
                return;
            }

            //使用子线程，防止ui线程卡顿
            Task.Run(() =>
            {
                IsEnable = false;
                bool[] result = _modbusRTU.ReadCoil(validation.slaveAddress, validation.startAddress, validation.numberOfPoints);

                if (result == null)
                {
                    MessageBox.Show("读取失败", "error", MessageBoxButton.OK, MessageBoxImage.Error);
                    ModbusLogList = GetOperateCoil();
                    IsEnable = true;
                    return;
                }
                string temp = "";
                int count = 0;
                foreach (var item in result)
                {
                    count++;
                    temp += item;
                    temp += " ";
                    if(count %25 == 0)
                    {
                        temp += "\n";
                    }
                }
                ReadResult = temp;
                MessageBox.Show("读取成功");
                IsEnable = true;
                ModbusLogList = GetOperateCoil();
            });


        }



        private void WriteCoil()
        {
            //检测当前输入的信息是否正确
            var validation = CheckInputUitl.ValidateWriteParameters(WriteSlaveAddress, WriteStartAddress,WriteData);
            if (!validation.success)
            {
                return;
            }
            //去除字符串中的空格
            WriteData = WriteData.Replace(" ", "");
            //转换为布尔数组
            bool[] data = WriteData.Select(m => m == '1').ToArray();

            //使用子线程执行，避免ui线程卡顿
            Task.Run(() =>
            {
                IsEnable = false;
                bool issucceed = _modbusRTU.WriteCoil(validation.slaveAddress, validation.startAddress, data);
                ModbusLogList = GetOperateCoil();
                if (issucceed)
                {
                    MessageBox.Show("写入成功");
                    
                }
                else
                {
                    MessageBox.Show("写入失败", "error", MessageBoxButton.OK, MessageBoxImage.Error);
                    
                }
                IsEnable = true;
            });

        }

        /// <summary>
        /// 获取展示数据
        /// </summary>
        /// <returns></returns>
        private List<ModbusLog> GetOperateCoil()
        {
            return _modbusDbContext.ModbusLog
                   .Where(log => log.OperationType == "读线圈" || log.OperationType == "写线圈")
                   .OrderByDescending(log => log.Time)  // 按时间倒序，最新的在前
                   .Take(30)  // 只取前20条记录
                   .ToList();  // 执行查询
        }


        /// <summary>
        /// 释放资源
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        /// <summary>
        /// 真实调用的方法
        /// </summary>
        /// <param name="disposing"></param>
        protected virtual void Dispose(bool disposing)
        {
            if (_disposed)
                return; // 避免重复释放

            // 释放托管资源（仅在手动调用Dispose时执行）
            if (disposing)
            {

                //_serialPort是单例的，不要手动释放

                // 释放数据库上下文是瞬态的需要手动释放
                if (_modbusDbContext != null)
                {
                    _modbusDbContext.Dispose();
                    _modbusDbContext = null;
                }
                if (_modbusRTU != null)
                {
                    _modbusRTU.Dispose();
                    _modbusRTU = null;
                }
            }




            _disposed = true; // 标记为已释放
        }
    }
}