/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2012 Martin Gräßlin <mgraesslin@kde.org>

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, see <http://www.gnu.org/licenses/>.
*********************************************************************/

#ifndef KWIN_DBUS_INTERFACE_H
#define KWIN_DBUS_INTERFACE_H

#include <QObject>
#include <QtDBus/QtDBus>

namespace KWin
{

class Compositor;

/**
 * @brief This class is a wrapper for the org.kde.KWin D-Bus interface.
 *
 * The main purpose of this class is to be exported on the D-Bus as object /KWin.
 * It is a pure wrapper to provide the deprecated D-Bus methods which have been
 * removed from Workspace which used to implement the complete D-Bus interface.
 *
 * Nowadays the D-Bus interfaces are distributed, parts of it are exported on
 * /Compositor, parts on /Effects and parts on /KWin. The implementation in this
 * class just delegates the method calls to the actual implementation in one of the
 * three singletons.
 *
 * @author Martin Gräßlin <mgraesslin@kde.org>
 **/
class DBusInterface: public QObject
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "org.kde.KWin")
public:
    explicit DBusInterface(QObject *parent);
    virtual ~DBusInterface();

public: // PROPERTIES
public Q_SLOTS: // METHODS
    Q_NOREPLY void cascadeDesktop();
    int currentDesktop();
    Q_NOREPLY void killWindow();
    void nextDesktop();
    void previousDesktop();
    Q_NOREPLY void reconfigure();
    bool setCurrentDesktop(int desktop);
    bool startActivity(const QString &in0);
    bool stopActivity(const QString &in0);
    QString supportInformation();
    Q_NOREPLY void unclutterDesktop();
    Q_NOREPLY void showDebugConsole();

private Q_SLOTS:
    void becomeKWinService(const QString &service);

private:
    void announceService();
    QString m_serviceName;
};

class CompositorDBusInterface : public QObject
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "org.kde.kwin.Compositing")
    /**
     * @brief Whether the Compositor is active. That is a Scene is present and the Compositor is
     * not shutting down itself.
     **/
    Q_PROPERTY(bool active READ isActive)
    /**
     * @brief Whether compositing is possible. Mostly means whether the required X extensions
     * are available.
     **/
    Q_PROPERTY(bool compositingPossible READ isCompositingPossible)
    /**
     * @brief The reason why compositing is not possible. Empty String if compositing is possible.
     **/
    Q_PROPERTY(QString compositingNotPossibleReason READ compositingNotPossibleReason)
    /**
     * @brief Whether OpenGL has failed badly in the past (crash) and is considered as broken.
     **/
    Q_PROPERTY(bool openGLIsBroken READ isOpenGLBroken)
    /**
     * The type of the currently used Scene:
     * @li @c none No Compositing
     * @li @c xrender XRender
     * @li @c gl1 OpenGL 1
     * @li @c gl2 OpenGL 2
     * @li @c gles OpenGL ES 2
     **/
    Q_PROPERTY(QString compositingType READ compositingType)
    /**
     * @brief All currently supported OpenGLPlatformInterfaces.
     *
     * Possible values:
     * @li glx
     * @li egl
     *
     * Values depend on operation mode and compile time options.
     **/
    Q_PROPERTY(QStringList supportedOpenGLPlatformInterfaces READ supportedOpenGLPlatformInterfaces)
    Q_PROPERTY(bool platformRequiresCompositing READ platformRequiresCompositing)
public:
    explicit CompositorDBusInterface(Compositor *parent);
    virtual ~CompositorDBusInterface() = default;

    bool isActive() const;
    bool isCompositingPossible() const;
    QString compositingNotPossibleReason() const;
    bool isOpenGLBroken() const;
    QString compositingType() const;
    QStringList supportedOpenGLPlatformInterfaces() const;
    bool platformRequiresCompositing() const;

public Q_SLOTS:
    /**
     * @brief Suspends the Compositor if it is currently active.
     *
     * Note: it is possible that the Compositor is not able to suspend. Use @link isActive to check
     * whether the Compositor has been suspended.
     *
     * @return void
     * @see resume
     * @see isActive
     **/
    void suspend();
    /**
     * @brief Resumes the Compositor if it is currently suspended.
     *
     * Note: it is possible that the Compositor cannot be resumed, that is there might be Clients
     * blocking the usage of Compositing or the Scene might be broken. Use @link isActive to check
     * whether the Compositor has been resumed. Also check @link isCompositingPossible and
     * @link isOpenGLBroken.
     *
     * Note: The starting of the Compositor can require some time and is partially done threaded.
     * After this method returns the setup may not have been completed.
     *
     * @return void
     * @see suspend
     * @see isActive
     * @see isCompositingPossible
     * @see isOpenGLBroken
     **/
    void resume();

Q_SIGNALS:
    void compositingToggled(bool active);

private:
    Compositor *m_compositor;
};

} // namespace

#endif // KWIN_DBUS_INTERFACE_H