/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2022  Vladimir Golovnev <glassez@yandex.ru>
 *
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#pragma once

#include <concepts>
#include <utility>

#include <QtClassHelperMacros>

class IApplication;

class ApplicationComponentBase
{
    Q_DISABLE_COPY_MOVE(ApplicationComponentBase)

public:
    virtual ~ApplicationComponentBase() = default;

    IApplication *app() const;

protected:
    explicit ApplicationComponentBase(IApplication *app);

private:
    IApplication *m_app = nullptr;
};

template <typename T>
concept IsApplicationComponent = std::derived_from<T, ApplicationComponentBase>;

template <typename Base>
requires (!IsApplicationComponent<Base>)
class ApplicationComponent : public Base, public ApplicationComponentBase
{
public:
    template <typename... Args>
    explicit ApplicationComponent(IApplication *app, Args&&... args)
        : Base(std::forward<Args>(args)...)
        , ApplicationComponentBase(app)
    {
    }
};
