namespace IvyBus
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Net;
    using System.Net.Sockets;
    using System.IO;
    
    abstract class IvyUDPStream: IDisposable
    {
        protected MemoryStream out_stream;
        protected MemoryStream in_stream;
        private Socket socket;
        private byte[] buffer;
   
        private int protocolVersion;

        public int ProtocolVersion
        {
            get { return protocolVersion; }
        }

        public IvyUDPStream(Socket _socket, int protocol) 
		{
            socket = _socket;
            buffer = new byte[4096];
            in_stream = new MemoryStream(buffer);
            out_stream = new MemoryStream();
            protocolVersion = protocol;
		}
        internal void Close()
        {
            in_stream.Close();
            out_stream.Close();
            socket.Shutdown(SocketShutdown.Both);
            socket.Close();
        }
        internal void receiveMsg(out IPEndPoint remote, out int version, out int port, out string appId, out string appName)
        {
            int len;
            IPEndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
            EndPoint tempRemoteEP = (EndPoint)remoteEP;
            remoteEP = null;
            len = socket.ReceiveFrom(buffer, ref tempRemoteEP);
            remote = (IPEndPoint)tempRemoteEP;
            in_stream.Position = 0;
            in_stream.SetLength(len);
            in_stream.Seek(0, SeekOrigin.Begin);
            //Call Deserialization
            Deserialize( out version, out port, out appId, out appName );
        }
        internal void sendMsg(IPEndPoint EPhost, int port, string appId, string appName)
        {
            // Call Serialisation
            Serialize(port, appId, appName);
            
            byte[] hellob = out_stream.GetBuffer();
            socket.SendTo(hellob, (int)out_stream.Length, 0, EPhost);
        }
        abstract internal void Serialize(int port, string appId, string appName);
        abstract internal void Deserialize(out int version, out int port, out string appId, out string appName);


        #region IDisposable Membres

        //Implement IDisposable.
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                // Free other state (managed objects).
                if (out_stream != null)
                {
                    out_stream.Close();
                    out_stream = null;
                }
                if (in_stream != null)
                {
                    in_stream.Close();
                    in_stream = null;
                }
            }
            // Free your own state (unmanaged objects).
            // Set large fields to null.
            
        }
        #endregion
    }
}