using ModbusSimulationProtocol.Interface;
using NModbus;
using System.Net;
using System.Net.Sockets;
using SlaveDataStore = ModbusSimulationProtocol.Data.SlaveDataStore;

namespace ModbusSimulationProtocol.Services;

public class ModbusSlaveService : IModbusSlaveService
{
    private readonly IModbusLogger? _logger;

    private readonly ModbusFactory _factory;
    private readonly ISlaveDataStore _slaveDataStore;
    private IModbusTcpSlaveNetwork? _network;

    private bool disposedValue;

    public ModbusSlaveService(IModbusLogger? logger)
    {
        _logger = logger;

        _factory = new ModbusFactory(logger: _logger);
        _slaveDataStore = new SlaveDataStore();
    }

    public ISlaveDataStore SlaveDataStore => _slaveDataStore;

    public bool Initialize(string ip, ushort port, byte slaveId = 1)
    {
        if (string.IsNullOrWhiteSpace(ip))
        {
            WriteLog(LoggingLevel.Error, "Incorrect ip address.");
            return false;
        }

        if (_network is not null)
        {
            WriteLog(LoggingLevel.Warning, "The slave network has been created.");
            return false;
        }

        try
        {
            TcpListener listener = new(IPAddress.Parse(ip), (int)port);
            _network = _factory.CreateSlaveNetwork(listener);
            var slave = _factory.CreateSlave(slaveId, _slaveDataStore);
            _network.AddSlave(slave);
            WriteLog(LoggingLevel.Information, "Completed initailization.");
            return true;
        }
        catch (Exception ex)
        {
            WriteLog(LoggingLevel.Error, ex.ToString());
            return false;
        }
    }

    public bool Open()
    {
        if (_network is null)
        {
            WriteLog(LoggingLevel.Error, "Performs initializing before doing any operation.");
            return false;
        }

        Task.Run(async () =>
        {
            try
            {
                WriteLog(LoggingLevel.Information, "Starts Tcp Listening");
                await _network.ListenAsync();
            }
            catch (Exception ex)
            {
                WriteLog(LoggingLevel.Error, ex.ToString());
            }
        });
        return true;
    }

    public bool TryWriteValues<TPoint>(IPointSource<TPoint> source, ushort address, TPoint[] points)
    {
        if (_network is null)
        {
            WriteLog(LoggingLevel.Error, "Performs initializing before doing any operation.");
            return false;
        }

        try
        {
            source.WritePoints(address, points);
            return true;
        }
        catch (Exception ex)
        {
            WriteLog(LoggingLevel.Error, ex.ToString());
            return false;
        }
    }

    public bool TryReadValues<TPoint>(IPointSource<TPoint> source, ushort address, ushort count, out TPoint[]? outPoints)
    {
        if (_network is null)
        {
            WriteLog(LoggingLevel.Error, "Performs initializing before doing any operation.");
            outPoints = null;
            return false;
        }

        try
        {
            outPoints = source.ReadPoints(address, count);
            return true;
        }
        catch (Exception ex)
        {
            WriteLog(LoggingLevel.Error, ex.ToString());
            outPoints = null;
            return false;
        }
    }

    private void WriteLog(LoggingLevel loggingLevel, string log)
    {
        _logger?.Log(loggingLevel, $"[{nameof(ModbusSlaveService)}]:{log}");
    }

    protected virtual void Dispose(bool disposing)
    {
        if (!disposedValue)
        {
            if (disposing)
            {
                // TODO: dispose managed state (managed objects)
                _network?.Dispose();
            }

            // TODO: free unmanaged resources (unmanaged objects) and override finalizer
            // TODO: set large fields to null
            disposedValue = true;
        }
    }

    // // TODO: override finalizer only if 'Dispose(bool disposing)' has code to free unmanaged resources
    // ~ModbusSlaveService()
    // {
    //     // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
    //     Dispose(disposing: false);
    // }

    public void Dispose()
    {
        // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
        Dispose(disposing: true);
        GC.SuppressFinalize(this);
    }
}