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using UnityEngine;

using System;

using System.Collections;

using System.IO;

using System.Net;

using System.Net.Sockets;

using System.Globalization;

using System.Text;

using System.Reflection;

using System.Threading;

public class SCL_SocketClientThreadHolder

{

protected readonly Thread thread;

protected readonly SCL_ClientSocketHandler handler;

public Thread Thread {

get {

return this.thread;

}

}

public SCL_ClientSocketHandler Handler {

get {

return this.handler;

}

}

public SCL_SocketClientThreadHolder (Thread thread, SCL_ClientSocketHandler handler)

{

this.thread = thread;

this.handler = handler;

}

}

public class SCL_SocketServer

{

protected readonly TcpListener listener = null;

protected readonly SCL_IClientSocketHandlerDelegate clientSocketHandlerDelegate;

protected readonly string separatorString;

protected readonly Encoding encoding;

protected ArrayList clientHandlerThreads;

protected readonly int portNumber;

protected readonly IPEndPoint localEndPoint;

protected readonly int maxClients;

public int PortNumber {

get {

return this.portNumber;

}

}

public IPEndPoint LocalEndPoint {

get {

return this.localEndPoint;

}

}

public int MaxClients {

get {

return this.maxClients;

}

}

public int ClientCount {

get {

return this.clientHandlerThreads.Count;

}

}

public SCL_SocketServer (SCL_IClientSocketHandlerDelegate clientSocketHandlerDelegate,

int maxClients = 1,

string separatorString = "\n",

int portNumber = 13000,

Encoding encoding = null)

{

this.portNumber = portNumber;

this.clientSocketHandlerDelegate = clientSocketHandlerDelegate;

this.separatorString = separatorString;

this.encoding = (encoding != null) ? encoding : Encoding.UTF8;

this.clientHandlerThreads = ArrayList.Synchronized(new ArrayList());

this.maxClients = maxClients;

// this is the local endpoing through which we shall listen

// for connections. the ip is resolved dynamically and the

// host is somewhat arbitrary (can be set by user)

IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());

IPAddress ipAddress = ipHostInfo.AddressList[0];

this.localEndPoint = new IPEndPoint(ipAddress, this.portNumber);

// create the socket to listen to the tcp communication

this.listener = new TcpListener(this.localEndPoint.Address, this.portNumber);

Debug.Log("Created TCP listener.");

}

public void StartListeningForConnections()

{

Debug.Log("Began listening for TCP clients.");

this.listener.Start();

this.ListenForConnection();

}

protected void ListenForConnection()

{

this.listener.BeginAcceptTcpClient(new AsyncCallback(this.AcceptCallback), this.listener);

}

// NOT on main thread

protected void AcceptCallback(IAsyncResult ar)

{

int threadId = Thread.CurrentThread.ManagedThreadId;

Debug.Log ("Accept thread id: " + threadId);

TcpListener listener = (TcpListener)ar.AsyncState;

TcpClient client = listener.EndAcceptTcpClient(ar);

Debug.Log ("thread id " + threadId + " accepted client " + client.Client.RemoteEndPoint);

Debug.Log ("thread id " + threadId + " beginning read from client " + client.Client.RemoteEndPoint);

SCL_ClientSocketHandler clientHandler =

new SCL_ClientSocketHandler(client,

this.clientSocketHandlerDelegate,

this.separatorString,

this.encoding);

Thread clientThread = new Thread(new ThreadStart(clientHandler.Run));

this.clientHandlerThreads.Add(new SCL_SocketClientThreadHolder(clientThread, clientHandler));

clientThread.Start();

Debug.Log ("Client thread started");

if (this.ClientCount < this.maxClients)

{

Debug.Log ("client handler threads less than max clients. Listening again");

this.ListenForConnection();

}

else

{

Debug.Log (String.Format ("Max number of clients reached ({0}), stopping listening", this.maxClients));

this.StopListeningForConnections();

}

}

public void StopListeningForConnections() {

this.listener.Stop();

Debug.Log ("Stopped listening for connections");

}

public void Cleanup()

{

this.listener.Stop();

foreach(SCL_SocketClientThreadHolder holder in this.clientHandlerThreads)

{

Debug.Log ("calling stop on thread " + holder.Thread.ManagedThreadId);

holder.Handler.Cleanup();

Debug.Log ("Calling thread abort on thread: " + holder.Thread.ManagedThreadId);

holder.Thread.Abort();

}

this.clientHandlerThreads = null;

}

}