using System;
using System.Text;
using System.Net.Sockets;
using System.Threading;
using System.Net;

namespace TCPServerTutorial
{
    class Server
    {
        private TcpListener tcpListener;
        private Thread listenThread;

        public Server()
        {
            this.tcpListener = new TcpListener(IPAddress.Any, 3000);
            this.listenThread = new Thread(new ThreadStart(ListenForClients));
            this.listenThread.Start();
            Console.WriteLine("Server started at {0} :{1} @ {2}", IPAddress.Any, 1031, DateTime.Now.ToString());
        }


        private void ListenForClients()
        {
            this.tcpListener.Start();

            while (true)
            {
                //blocks until a client has connected to the server
                TcpClient client = this.tcpListener.AcceptTcpClient();

                //create a thread to handle communication 
                //with connected client
                Thread clientThread = new Thread(new ParameterizedThreadStart(HandleClientComm));
                clientThread.Start(client);
            }
        }


        private void HandleClientComm(object client)
        {
            TcpClient tcpClient = (TcpClient)client;
            Console.WriteLine("Client @[{0}] connected @{1}", tcpClient.Client.LocalEndPoint,DateTime.Now.ToString());

            NetworkStream clientStream = tcpClient.GetStream();

            byte[] message = new byte[4096];
            int bytesRead=0;
            //bool isRight=false;
            
            while (true)
            {
                bytesRead = 0;

                try
                {
                    //blocks until a client sends a message
                    bytesRead = clientStream.Read(message, 0, 4096);
                }
                catch
                {
                    //a socket error has occured
                    Console.WriteLine("Error:receive msg error");
                    break;
                }

                if (bytesRead == 0)
                {
                    //the client has disconnected from the server
                    Console.WriteLine("Client @[{0}] disconnect @{1}", tcpClient.Client.LocalEndPoint,DateTime.Now.ToString());
                    break;
                }

                //message has successfully been received
                ASCIIEncoding encoder = new ASCIIEncoding();
                //System.Diagnostics.Debug.WriteLine(encoder.GetString(message, 0, bytesRead));
                string recvstr=encoder.GetString(message, 0, bytesRead);
                Console.WriteLine("Recv:[{1}]:msg:@[{0}] @{2}", recvstr, tcpClient.Client.LocalEndPoint, DateTime.Now.ToString());

                //send msg to client
                string sendstr = "Server OK";
                if (recvstr=="101")
                {
                    //isRight = true;
                    sendstr = "202";
                    Console.ForegroundColor = ConsoleColor.Red;
                }
                else
                {
                    Console.ForegroundColor = ConsoleColor.White;
                }

                byte[] buffer = encoder.GetBytes(sendstr);
                clientStream.Write(buffer, 0, buffer.Length);
                clientStream.Flush();
               
                Console.WriteLine("Sent:[{1}]:msg:@[{0}] @{2}
", sendstr, tcpClient.Client.LocalEndPoint, DateTime.Now.ToString());
            }

            tcpClient.Close();
        }


    }


}