using System.IO.Ports;
using Sensus;
using Sensus.CommunicationDevices;
using Sensus.Protocols.FlexNet.Serial;
using Sensus.Protocols.FlexNet.Serial.FNv2;

namespace NfcC7_DLL.NfcHanler.Utils
{
    /// <summary>
    /// Provides a transaction manager for a CommandLink
    /// </summary>
    public class SerialManager: ISerialConnection, IDisposable
    {
        public FlexNetSerialConnection FactoryUart = null;
        public string ComPortString { get; private set; }

        /// <summary>
        /// Sets up Serial for communication
        /// </summary>
        /// <param name="serialComPort">Serial COM port</param>
        public SerialManager(string serialcomPort)
        {
            // Initialize Serial Port
            SerialPort factoryUart = new SerialPort(serialcomPort, 115200, Parity.None, 8, StopBits.One);
            FactoryUart = new FlexNetSerialConnection(serialcomPort);
            FactoryUart.SetBaudRate(115200);
            ComPortString = serialcomPort;
        }
        public void Open()
        {
            // Open Factory UART
            if (!FactoryUart.IsConnected)
            {
                FactoryUart.Connect(null);
            }
        }
        public void Close()
        {
            FactoryUart.Disconnect();
        }

        public bool IsConnected { get { return FactoryUart.IsConnected; } }

        object objectLock = new Object();

        public event EventHandler<ReceptionEventArgs<ISerialMessageFrame>> MessageReceived
        {
            add
            {
                lock (objectLock)
                {
                    FactoryUart.MessageReceived += value;
                }
            }
            remove
            {
                lock (objectLock)
                {
                    FactoryUart.MessageReceived -= value;
                }
            }
        }

        public event EventHandler<EventArgs> Disconnected
        {
            add
            {
                lock (objectLock)
                {
                    FactoryUart.Disconnected += value;
                }
            }
            remove
            {
                lock (objectLock)
                {
                    FactoryUart.Disconnected -= value;
                }
            }
        }

        public ClassicSerialMessageFrame SendFlexNetSerial(ISerialCommandFrame cmd, bool responseExpected, UInt32 timeoutMs)
        {
            ClassicSerialMessageFrame response = null;

            if(responseExpected)
            {
                try
                {
                    response = FactoryUart.Send(cmd, TimeSpan.FromMilliseconds(timeoutMs)) as ClassicSerialMessageFrame;
                }
                catch
                {
                    Log.Write("No response before timeout\n");
                }
            }
            else
            {
                FactoryUart.Send(cmd);
            }

            return response;
        }


        public NA2WSerialFrame SendNa2wSerial(ISerialCommandFrame cmdFrame, bool responseExpected, UInt32 timeoutMs)
        {
            NA2WSerialFrame response = null;

            if (responseExpected)
            {
                try
                {
                    response = FactoryUart.Send(cmdFrame, TimeSpan.FromMilliseconds(timeoutMs)) as NA2WSerialFrame;
                }
                catch (TimeoutException e)
                {
                    Log.Write("No response before timeout\n");
                }
            }
            else
            {
                FactoryUart.Send(cmdFrame);
            }

            return response;
        }

        public NA2WSerialFrame SendNa2wSerial(ISerialCommandFrame cmdFrame, bool responseExpected)
        {
            return SendNa2wSerial(cmdFrame, responseExpected, 5000);
        }

        public NA2WSerialFrame SendNa2wSerial(ISerialCommandFrame cmdFrame, byte responseCommandCode)
        {
            ISerialMessageFrame response = null;

            using (AutoResetEvent e = new AutoResetEvent(false))
            {
                EventHandler<ReceptionEventArgs<ISerialMessageFrame>> ackChecker = (mrs, mre) =>
                {
                    if (mre.Frame.CommandCode == responseCommandCode)
                    {
                        response = mre.Frame;
                        e.Set();
                    }
                };

                bool foundResponse = false;

                try
                {
                    FactoryUart.MessageReceived += ackChecker;
                    FactoryUart.Send(cmdFrame);
                    foundResponse = e.WaitOne(TimeSpan.FromSeconds(8));
                }
                finally
                {
                    FactoryUart.MessageReceived -= ackChecker;
                }

                if (!foundResponse)
                {
                    Log.Write("No response before timeout\n");
                }
            }

            if ((response != null) && (response is NA2WSerialFrame))
            {
                return ((NA2WSerialFrame) response);
            }
            else
            {
                return null;
            }
        }

        bool disposed = false;
        public void Dispose()
        {
            if (disposed)
                return;

            Close();
            disposed = true;
        }
    }
}