/*
 * 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/>.
 */

namespace ProtonVPN.Common.Core.OperatingSystems.EnvironmentVariables;

public static class EnvironmentVariableLoader
{
    public static string? GetOrNull(string variable)
    {
        string? result;
        try
        {
            result = Environment.GetEnvironmentVariable(variable, EnvironmentVariableTarget.Process) ??
                     Environment.GetEnvironmentVariable(variable, EnvironmentVariableTarget.User) ??
                     Environment.GetEnvironmentVariable(variable, EnvironmentVariableTarget.Machine);
        }
        catch
        {
            result = null;
        }

        return result;
    }
}