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

namespace ln.http
{
    public class HttpListener : IDisposable
    {
        public static int DefaultPort = 80;
        
        
        private IPEndPoint _localEndPoint;
        private Socket _socket;
        private HTTPServer _httpServer;

        public IPEndPoint LocalEndpoint => _localEndPoint;

        public HttpListener(HTTPServer httpServer) : this(httpServer, DefaultPort)
        {
        }

        public HttpListener(HTTPServer httpServer, int port)
        {
            _httpServer = httpServer;
            _localEndPoint = new IPEndPoint(IPAddress.IPv6Any, port);
            
            Initialize();
        }

        private void Initialize()
        {
            _socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
            _socket.ExclusiveAddressUse = false;
            _socket.Bind(_localEndPoint);
            _localEndPoint = (IPEndPoint)_socket.LocalEndPoint;
            _socket.Listen();

            ThreadPool.QueueUserWorkItem((state )=> ListenerThread());
        }

        private void ListenerThread()
        {
            while (_socket?.IsBound ?? false)
            {
                try
                {
                    Socket clientSocket = _socket.Accept();
                    _httpServer.Connection(
                        new HttpConnection(
                            _localEndPoint,
                            (IPEndPoint)clientSocket.RemoteEndPoint,
                            new NetworkStream(clientSocket)
                        )
                    );
                }
                catch
                {
                    throw;
                }
            }
        }

        public void Dispose()
        {
            _socket?.Close();
            _socket?.Dispose();
            _socket = null;
        }
    }
}