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

namespace Syroot.Worms.OnlineWorms.Server
{
    /// <summary>
    /// Represents a server listening for incoming client connections and dispatching them into <see cref="Client"/>
    /// instances.
    /// </summary>
    public class Server
    {
        // ---- FIELDS -------------------------------------------------------------------------------------------------

        private readonly List<Client> _clients = new List<Client>();

        // ---- METHODS (INTERNAL) -------------------------------------------------------------------------------------

        /// <summary>
        /// Starts the server by accepting new client connections under the given <paramref name="port"/> and
        /// dispatching them into asynchronous handling threads. This call is blocking.
        /// </summary>
        /// <param name="port">The port on which to listen for new client connections.</param>
        internal void Listen(int port)
        {
            TcpListener tcpListener = new TcpListener(IPAddress.Any, port);
            tcpListener.Start();
            Console.WriteLine($"Listening on port {port}...");

            // Continually accept clients and dispatch them to their listening thread.
            while (true)
            {
                Client client = new Client(tcpListener.AcceptTcpClient(), this);
                _clients.Add(client);

                Task.Run(client.Listen).ContinueWith(_ =>
                {
                    _clients.Remove(client);
                    client.Dispose();
                });
            }
        }
    }
}