using NModbus;
using System.Net.Sockets;

namespace TestApp.Driver
{
    public class VestelEvc04 : IChargerDriver, IDisposable
    {
        private IModbusMaster? _Modbus;
        private bool _Running;
        private Thread _HeartbeatThread;

        private string _HostAddress = "192.168.178.100";
        public string HostAddress
        {
            get => _HostAddress;
            set
            {
                if (_HostAddress == value) { return; }
                _HostAddress = value;
                Disconnect();
            }
        }

        private int _Port = 502;
        public int Port
        {
            get => _Port;
            set
            {
                if (_Port == value) { return; }
                _Port = value;
                Disconnect();
            }
        }

        public VestelEvc04()
        {
            _Running = true;
            _HeartbeatThread = new Thread(HeartbeatLoop);
            _HeartbeatThread.IsBackground = true;
            _HeartbeatThread.Start();
        }

        private void Connect()
        {
            if (!_Running) { return; }
            var factory = new ModbusFactory();
            var tcpClient = new TcpClient(HostAddress, Port);
            _Modbus = factory.CreateMaster(tcpClient);
        }

        private void Disconnect()
        {
            if (_Modbus is null) { return; }
            _Modbus.Dispose();
            _Modbus = null;
        }

        private void HeartbeatLoop()
        {
            while (_Running)
            {
                try
                {
                    if (_Modbus is null)
                    {
                        Connect();
                    }
                    if (_Modbus is null) { continue; }

                    var heardbeatValue = _Modbus.ReadHoldingRegisters(255, 6000, 1)[0];
                    if (heardbeatValue == 0)
                    {
                        _Modbus.WriteSingleRegister(255, 6000, 1);
                    }
                }
                catch (Exception e)
                {
                    System.Diagnostics.Debug.WriteLine(e.Message);
                    Disconnect();
                }
                Thread.Sleep(100);
            }
        }

        public (double I1, double I2, double I3) GetCurrents()
        {
            if (_Modbus is null)
            {
                Connect();
            }
            if (_Modbus is null) { return (double.NaN, double.NaN, double.NaN); }

            var i1 = _Modbus.ReadHoldingRegisters(255, 1008, 1)[0];
            var i2 = _Modbus.ReadHoldingRegisters(255, 1010, 1)[0];
            var i3 = _Modbus.ReadHoldingRegisters(255, 1012, 1)[0];

            return (0.001 * i1, 0.001 * i2, 0.001 * i3);
        }

        public void SetLoadingCurrent(double value)
        {
            if (!_Running) { return; }

            try
            {
                if (_Modbus is null)
                {
                    Connect();
                }
                if (_Modbus is null) { return; }

                ushort registerValue = (ushort)value;
                _Modbus.WriteSingleRegister(255, 5004, registerValue);
            }
            catch (Exception e)
            {
                System.Diagnostics.Debug.WriteLine(e.Message);
                Disconnect();
            }
        }

        public void Dispose()
        {
            _Running = false;
            Disconnect();
        }
    }
}