/*
 * Copyright (c) 2023 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 ProtonVPN.Client.Logic.Connection.Contracts.Validators;
using ProtonVPN.Logging.Contracts;
using ProtonVPN.Logging.Contracts.Events.NetworkLogs;
using ProtonVPN.OperatingSystems.Network.Contracts;

namespace ProtonVPN.Client.Logic.Connection.Validators;

public class NetworkAdapterValidator : INetworkAdapterValidator
{
    private readonly INetworkInterfaceProvider _networkInterfaceProvider;
    private readonly ILogger _logger;

    public NetworkAdapterValidator(INetworkInterfaceProvider networkInterfaceProvider, ILogger logger)
    {
        _networkInterfaceProvider = networkInterfaceProvider;
        _logger = logger;
    }

    public bool IsOpenVpnAdapterAvailable()
    {
        INetworkInterface? openVpnTapInterface = _networkInterfaceProvider.GetOpenVpnTapInterface();
        INetworkInterface? openVpnTunInterface = _networkInterfaceProvider.GetOpenVpnTunInterface();
        bool isOpenVpnAdapterAvailable = openVpnTapInterface != null || openVpnTunInterface != null;

        LogIsOpenVpnAdapterAvailable(isOpenVpnAdapterAvailable,
            CreateInterfaceLogMessage("TAP", openVpnTapInterface),
            CreateInterfaceLogMessage("TUN", openVpnTunInterface));

        return isOpenVpnAdapterAvailable;
    }

    private string CreateInterfaceLogMessage(string interfaceType, INetworkInterface? networkInterface)
    {
        if (networkInterface == null)
        {
            return $"The {interfaceType} adapter is unavailable.";
        }

        return $"The {interfaceType} adapter is available (Index: {networkInterface.Index}, " +
               $"Name: '{networkInterface.Name}', Description: '{networkInterface.Description}').";
    }

    private void LogIsOpenVpnAdapterAvailable(bool isOpenVpnAdapterAvailable, params string[] openVpnInterfaces)
    {
        string logMessage = "Checking which OpenVPN adapters are available. " + string.Join(" ", openVpnInterfaces);
        if (isOpenVpnAdapterAvailable)
        {
            _logger.Info<NetworkLog>(logMessage);
        }
        else
        {
            _logger.Warn<NetworkLog>(logMessage);
        }
    }
}