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

namespace Lab20Server
{
    class Program
    {
        public static void Main(string[] args)
        {
            //Console.OutputEncoding = Encoding.GetEncoding(866);
            Console.WriteLine("Server started");

            IPHostEntry iPHost = Dns.GetHostEntry("localhost");
            IPAddress iPAddress = iPHost.AddressList[0];
            IPEndPoint iPEndPoint = new IPEndPoint(iPAddress, 8888);

            Socket socket = new Socket(
                iPAddress.AddressFamily,
                SocketType.Stream,
                ProtocolType.Tcp
            );

            try
            {
                socket.Bind(iPEndPoint);
                socket.Listen(10);
                while (true)
                {
                    Console.WriteLine($"Listening on port {iPEndPoint}");

                    // Принятие данных
                    Socket s = socket.Accept();
                    string data = null;
                    byte[] bytes = new byte[1024];
                    int bytesCount = s.Receive(bytes);
                    data += Encoding.UTF8.GetString(bytes, 0, bytesCount);

                    Console.WriteLine($"Data from client: {data}\n\n");

                    // Эхо
                    string reply = $"Query size: {data.Length} chars";
                    byte[] msg = Encoding.UTF8.GetBytes(reply);
                    s.Send(msg);

                    // Проверка на закрытие
                    if (data.IndexOf("<TheEnd>") > -1)
                    {
                        Console.WriteLine("Connection closed");
                        break;
                    }

                    s.Shutdown(SocketShutdown.Both);
                    s.Close();
                }
            } 
            catch (Exception exc)
            {
                Console.WriteLine(exc.ToString());
            }
        }
    }
}