using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
using Emby.Server.Implementations.Networking;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;

namespace Emby.Server.Implementations.Net
{
    public class NetAcceptSocket : IAcceptSocket
    {
        public Socket Socket { get; private set; }
        private readonly ILogger _logger;

        public bool DualMode { get; private set; }

        public NetAcceptSocket(Socket socket, ILogger logger, bool isDualMode)
        {
            if (socket == null)
            {
                throw new ArgumentNullException("socket");
            }
            if (logger == null)
            {
                throw new ArgumentNullException("logger");
            }

            Socket = socket;
            _logger = logger;
            DualMode = isDualMode;
        }

        public IpEndPointInfo LocalEndPoint
        {
            get
            {
                return NetworkManager.ToIpEndPointInfo((IPEndPoint)Socket.LocalEndPoint);
            }
        }

        public IpEndPointInfo RemoteEndPoint
        {
            get
            {
                return NetworkManager.ToIpEndPointInfo((IPEndPoint)Socket.RemoteEndPoint);
            }
        }

        public void Connect(IpEndPointInfo endPoint)
        {
            var nativeEndpoint = NetworkManager.ToIPEndPoint(endPoint);

            Socket.Connect(nativeEndpoint);
        }

        public void Close()
        {
#if NET46
            Socket.Close();
#else
            Socket.Dispose();
#endif
        }

        public void Shutdown(bool both)
        {
            if (both)
            {
                Socket.Shutdown(SocketShutdown.Both);
            }
            else
            {
                // Change interface if ever needed
                throw new NotImplementedException();
            }
        }

        public void Listen(int backlog)
        {
            Socket.Listen(backlog);
        }

        public void Bind(IpEndPointInfo endpoint)
        {
            var nativeEndpoint = NetworkManager.ToIPEndPoint(endpoint);

            Socket.Bind(nativeEndpoint);
        }

        private SocketAcceptor _acceptor;
        public void StartAccept(Action<IAcceptSocket> onAccept, Func<bool> isClosed)
        {
            _acceptor = new SocketAcceptor(_logger, Socket, onAccept, isClosed, DualMode);

            _acceptor.StartAccept();
        }

        public Task SendFile(string path, byte[] preBuffer, byte[] postBuffer, CancellationToken cancellationToken)
        {
            var options = TransmitFileOptions.UseDefaultWorkerThread;

            var completionSource = new TaskCompletionSource<bool>();

            var result = Socket.BeginSendFile(path, preBuffer, postBuffer, options, new AsyncCallback(FileSendCallback), new Tuple<Socket, string, TaskCompletionSource<bool>>(Socket, path, completionSource));

            return completionSource.Task;
        }

        public IAsyncResult BeginSendFile(string path, byte[] preBuffer, byte[] postBuffer, AsyncCallback callback, object state)
        {
            var options = TransmitFileOptions.UseDefaultWorkerThread;

            return Socket.BeginSendFile(path, preBuffer, postBuffer, options, new AsyncCallback(FileSendCallback), state);
        }

        public void EndSendFile(IAsyncResult result)
        {
            Socket.EndSendFile(result);
        }

        private void FileSendCallback(IAsyncResult ar)
        {
            // Retrieve the socket from the state object.
            Tuple<Socket, string, TaskCompletionSource<bool>> data = (Tuple<Socket, string, TaskCompletionSource<bool>>)ar.AsyncState;

            var client = data.Item1;
            var path = data.Item2;
            var taskCompletion = data.Item3;

            // Complete sending the data to the remote device.
            try
            {
                client.EndSendFile(ar);
                taskCompletion.TrySetResult(true);
            }
            catch (SocketException ex)
            {
                _logger.Info("Socket.SendFile failed for {0}. error code {1}", path, ex.SocketErrorCode);
                taskCompletion.TrySetException(ex);
            }
            catch (Exception ex)
            {
                taskCompletion.TrySetException(ex);
            }
        }

        public void Dispose()
        {
            Socket.Dispose();
        }
    }
}