//******************************************************************************************************
//  TransferChannelFactory.cs - Gbtc
//
//  Copyright © 2020, Grid Protection Alliance.  All Rights Reserved.
//
//  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
//  the NOTICE file distributed with this work for additional information regarding copyright ownership.
//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may not use this
//  file except in compliance with the License. You may obtain a copy of the License at:
//
//      http://opensource.org/licenses/MIT
//
//  Unless agreed to in writing, the subject software distributed under the License is distributed on an
//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
//  License for the specific language governing permissions and limitations.
//
//  Code Modification History:
//  ----------------------------------------------------------------------------------------------------
//  05/12/2020 - J. Ritchie Carroll
//       Generated original version of source code.
//
//******************************************************************************************************

#region [ Contributor License Agreements ]

//*******************************************************************************************************
//
//   Code based on the following project:
//        https://github.com/Callisto82/tftp.net
//  
//   Copyright © 2011, Michael Baer
//
//*******************************************************************************************************

#endregion

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

namespace GSF.Net.TFtp.Channel
{
    internal static class TransferChannelFactory
    {
        public static ITransferChannel CreateServer(EndPoint localAddress)
        {
            if (localAddress is IPEndPoint endPoint)
                return CreateServerUdp(endPoint);

            throw new NotSupportedException("Unsupported endpoint type.");
        }

        public static ITransferChannel CreateConnection(EndPoint remoteAddress)
        {
            if (remoteAddress is IPEndPoint endPoint)
                return CreateConnectionUdp(endPoint);

            throw new NotSupportedException("Unsupported endpoint type.");
        }

        #region UDP connections

        private static ITransferChannel CreateServerUdp(IPEndPoint localAddress)
        {
            UdpClient socket = new UdpClient(localAddress);
            return new UdpChannel(socket);
        }

        private static ITransferChannel CreateConnectionUdp(IPEndPoint remoteAddress)
        {
            IPEndPoint localAddress = new IPEndPoint(IPAddress.Any, 0);
            UdpChannel channel = new UdpChannel(new UdpClient(localAddress)) { RemoteEndpoint = remoteAddress };
            return channel;
        }

        #endregion
    }
}