using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;

public class TCPListenerTest {

    public static void Main() {
        TCPListenerTest listenerTest = new TCPListenerTest();
        
        TcpListener listener = new TcpListener(IPAddress.IPv6Any, 11000);
        listener.Server.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, 0);

        // 開始
        listener.Start();
        
        Thread thread = new Thread ( () => listenerTest.TCPListenerFunc(listener));
        thread.Name = "test";
        thread.Start();
    }

    void SocketInTask(TCPListenerTest listenerTest) {
        // Thread thread = new Thread (listenerTest.TCPListenerFunc);
        // thread.Start();
    }
    
    
    public void TCPListenerFunc(TcpListener server) {
        //TcpListener server = null;
        try {
            // IPAddress localAddress = IPAddress.Parse("127.0.0.1");
            //
            // server = new TcpListener(IPAddress.IPv6Any, 11000);
            // // ipv4/v6対応
            // server.Server.SetSocketOption(SocketOptionLevel.IPv6, SocketOptionName.IPv6Only, 0);
            //
            // // 開始
            // server.Start();

            string data = null;
            Byte[] bytes = new byte[256];

            while (true) {
                Console.Write("Waiting for a connection... ");

                TcpClient client = server.AcceptTcpClient();
                client.NoDelay = true;

                IPEndPoint endPoint = (IPEndPoint) client.Client.RemoteEndPoint;
                IPAddress ipAddress = endPoint.Address;
                IPHostEntry hostEntry = Dns.GetHostEntry(ipAddress);
                Console.WriteLine("host:" + hostEntry.HostName + " port:" + endPoint.Port);
                
                data = null;

                NetworkStream stream = client.GetStream();

                int i;

                // Loop to receive all the data sent by the client.
                while ((i = stream.Read(bytes, 0, bytes.Length)) != 0) {
                    // Translate data bytes to a ASCII string.
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
                    Console.WriteLine("Received: {0}", data);

                    // Process the data sent by the client.
                    data = data.ToUpper();

                    byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);

                    // Send back a response.
                    stream.Write(msg, 0, msg.Length);
                    Console.WriteLine("Sent: {0}", data);
                }

                // Shutdown and end connection
                client.Close();
            }
        } catch (SocketException e) {
            Console.WriteLine("SocketException: {0}", e);
        } finally {
            server.Stop();
        }
    }
}