/*
    SPDX-FileCopyrightText: 2015 Marco Martin <notmart@gmail.com>

    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#ifndef KWAYLAND_CLIENT_SLIDE_H
#define KWAYLAND_CLIENT_SLIDE_H

#include <QObject>

#include "KWayland/Client/kwaylandclient_export.h"

struct org_kde_kwin_slide_manager;
struct org_kde_kwin_slide;

namespace KWayland
{
namespace Client
{
class EventQueue;
class Slide;
class Surface;

/**
 * @short Wrapper for the org_kde_kwin_slide_manager interface.
 *
 * This class provides a convenient wrapper for the org_kde_kwin_slide_manager interface.
 *
 * Ask the compositor to move the surface from a location
 * to another with a slide animation.
 *
 * The from argument provides a clue about where the slide
 * animation begins, offset is the distance from screen
 * edge to begin the animation.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the SlideManager interface:
 * @code
 * SlideManager *c = registry->createSlideManager(name, version);
 * @endcode
 *
 * This creates the SlideManager and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 * SlideManager *c = new SlideManager;
 * c->setup(registry->bindSlideManager(name, version));
 * @endcode
 *
 * The SlideManager can be used as a drop-in replacement for any org_kde_kwin_slide_manager
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 **/
class KWAYLANDCLIENT_EXPORT SlideManager : public QObject
{
    Q_OBJECT
public:
    /**
     * Creates a new SlideManager.
     * Note: after constructing the SlideManager it is not yet valid and one needs
     * to call setup. In order to get a ready to use SlideManager prefer using
     * Registry::createSlideManager.
     **/
    explicit SlideManager(QObject *parent = nullptr);
    ~SlideManager() override;

    /**
     * Setup this SlideManager to manage the @p slidemanager.
     * When using Registry::createSlideManager there is no need to call this
     * method.
     **/
    void setup(org_kde_kwin_slide_manager *slidemanager);
    /**
     * @returns @c true if managing a org_kde_kwin_slide_manager.
     **/
    bool isValid() const;
    /**
     * Releases the org_kde_kwin_slide_manager interface.
     * After the interface has been released the SlideManager instance is no
     * longer valid and can be setup with another org_kde_kwin_slide_manager interface.
     **/
    void release();
    /**
     * Destroys the data held by this SlideManager.
     * This method is supposed to be used when the connection to the Wayland
     * server goes away. If the connection is not valid anymore, it's not
     * possible to call release anymore as that calls into the Wayland
     * connection and the call would fail. This method cleans up the data, so
     * that the instance can be deleted or set up to a new org_kde_kwin_slide_manager interface
     * once there is a new connection available.
     *
     * This method is automatically invoked when the Registry which created this
     * SlideManager gets destroyed.
     *
     * @see release
     **/
    void destroy();

    /**
     * Sets the @p queue to use for creating objects with this SlideManager.
     **/
    void setEventQueue(EventQueue *queue);
    /**
     * @returns The event queue to use for creating objects with this SlideManager.
     **/
    EventQueue *eventQueue();

    Slide *createSlide(Surface *surface, QObject *parent = nullptr);

    void removeSlide(Surface *surface);

    operator org_kde_kwin_slide_manager *();
    operator org_kde_kwin_slide_manager *() const;

Q_SIGNALS:
    /**
     * The corresponding global for this interface on the Registry got removed.
     *
     * This signal gets only emitted if the SlideManager got created by
     * Registry::createSlideManager
     **/
    void removed();

private:
    class Private;
    QScopedPointer<Private> d;
};

/**
 * TODO
 */
class KWAYLANDCLIENT_EXPORT Slide : public QObject
{
    Q_OBJECT
public:
    enum Location {
        Left = 0, /**< Slide from the left edge of the screen */
        Top, /**< Slide from the top edge of the screen */
        Right, /**< Slide from the bottom edge of the screen */
        Bottom, /**< Slide from the bottom edge of the screen */
    };

    ~Slide() override;

    /**
     * Setup this Slide to manage the @p slide.
     * When using SlideManager::createSlide there is no need to call this
     * method.
     **/
    void setup(org_kde_kwin_slide *slide);

    /**
     * @returns @c true if managing a org_kde_kwin_slide.
     **/
    bool isValid() const;

    /**
     * Releases the org_kde_kwin_slide interface.
     * After the interface has been released the Slide instance is no
     * longer valid and can be setup with another org_kde_kwin_slide interface.
     **/
    void release();

    /**
     * Destroys the data held by this Slide.
     * This method is supposed to be used when the connection to the Wayland
     * server goes away. If the connection is not valid anymore, it's not
     * possible to call release anymore as that calls into the Wayland
     * connection and the call would fail. This method cleans up the data, so
     * that the instance can be deleted or set up to a new org_kde_kwin_slide interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, slide, &Slide::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    void commit();

    /**
     * Set the location of the screen to slide the window from
     */
    void setLocation(Slide::Location location);

    /**
     * Set the offset from the screen edge
     * to make the window slide from
     */
    void setOffset(qint32 offset);

    operator org_kde_kwin_slide *();
    operator org_kde_kwin_slide *() const;

private:
    friend class SlideManager;
    explicit Slide(QObject *parent = nullptr);
    class Private;
    QScopedPointer<Private> d;
};

}
}

#endif