/*
 * Copyright (c) 2025 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

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

namespace ProtonVPN.Vpn.OpenVpn;

internal class BestNetworkInterface
{
    private readonly string _remoteHost;

    public BestNetworkInterface(string remoteHost)
    {
        _remoteHost = remoteHost;
    }

    public IPAddress? GetIpAddress()
    {
        try
        {
            using (var socket = new Socket(
                AddressFamily.InterNetwork,
                SocketType.Dgram,
                ProtocolType.Udp))
            {
                socket.Connect(_remoteHost, 1);
                IPEndPoint? localEndpoint = socket.LocalEndPoint as IPEndPoint;

                return localEndpoint?.Address;
            }
        }
        catch
        {
            return null;
        }
    }
}