/*
    SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>

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

#include <QObject>

#include "KWayland/Client/kwaylandclient_export.h"

struct org_kde_kwin_fake_input;

namespace KWayland
{
namespace Client
{
class EventQueue;

/**
 * @short Wrapper for the org_kde_kwin_fake_input interface.
 *
 * FakeInput allows to fake input events into the Wayland server. This is a privileged
 * Wayland interface and the Wayland server is allowed to ignore all events.
 *
 * This class provides a convenient wrapper for the org_kde_kwin_fake_input interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the FakeInput interface:
 * @code
 * FakeInput *m = registry->createFakeInput(name, version);
 * @endcode
 *
 * This creates the FakeInput and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 * FakeInput *m = new FakeInput;
 * m->setup(registry->bindFakeInput(name, version));
 * @endcode
 *
 * The FakeInput can be used as a drop-in replacement for any org_kde_kwin_fake_input
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 **/
class KWAYLANDCLIENT_EXPORT FakeInput : public QObject
{
    Q_OBJECT
public:
    /**
     * Creates a new FakeInput.
     * Note: after constructing the FakeInput it is not yet valid and one needs
     * to call setup. In order to get a ready to use FakeInput prefer using
     * Registry::createFakeInput.
     **/
    explicit FakeInput(QObject *parent = nullptr);
    ~FakeInput() override;

    /**
     * @returns @c true if managing a org_kde_kwin_fake_input.
     **/
    bool isValid() const;
    /**
     * Setup this FakeInput to manage the @p manager.
     * When using Registry::createFakeInput there is no need to call this
     * method.
     **/
    void setup(org_kde_kwin_fake_input *manager);
    /**
     * Releases the org_kde_kwin_fake_input interface.
     * After the interface has been released the FakeInput instance is no
     * longer valid and can be setup with another org_kde_kwin_fake_input interface.
     **/
    void release();
    /**
     * Destroys the data held by this FakeInput.
     * 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_fake_input interface
     * once there is a new connection available.
     *
     * This method is automatically invoked when the Registry which created this
     * FakeInput gets destroyed.
     *
     * @see release
     **/
    void destroy();

    /**
     * Sets the @p queue to use for bound proxies.
     **/
    void setEventQueue(EventQueue *queue);
    /**
     * @returns The event queue to use for bound proxies.
     **/
    EventQueue *eventQueue();

    /**
     * Authenticate with the Wayland server in order to request sending fake input events.
     * The Wayland server might ignore all requests without a prior authentication.
     *
     * The Wayland server might use the provided @p applicationName and @p reason to ask
     * the user whether this request should get authenticated.
     *
     * There is no way for the client to figure out whether the authentication was granted
     * or denied. The client should assume that it wasn't granted.
     *
     * @param applicationName A human readable description of the application
     * @param reason A human readable explanation why this application wants to send fake requests
     **/
    void authenticate(const QString &applicationName, const QString &reason);
    /**
     * Request a relative pointer motion of @p delta pixels.
     **/
    void requestPointerMove(const QSizeF &delta);
    /**
     * Request an absolute pointer motion to @p pos position.
     *
     * @since 5.54
     **/
    void requestPointerMoveAbsolute(const QPointF &pos);
    /**
     * Convenience overload.
     * @see requestPointerButtonPress(quint32)
     **/
    void requestPointerButtonPress(Qt::MouseButton button);
    /**
     * Request a pointer button press.
     * @param linuxButton The button code as defined in linux/input-event-codes.h
     **/
    void requestPointerButtonPress(quint32 linuxButton);
    /**
     * Convenience overload.
     * @see requestPointerButtonRelease(quint32)
     **/
    void requestPointerButtonRelease(Qt::MouseButton button);
    /**
     * Request a pointer button release.
     * @param linuxButton The button code as defined in linux/input-event-codes.h
     **/
    void requestPointerButtonRelease(quint32 linuxButton);
    /**
     * Convenience overload.
     * @see requestPointerButtonClick(quint32)
     **/
    void requestPointerButtonClick(Qt::MouseButton button);
    /**
     * Requests a pointer button click, that is a press directly followed by a release.
     * @param linuxButton The button code as defined in linux/input-event-codes.h
     **/
    void requestPointerButtonClick(quint32 linuxButton);
    /**
     * Request a scroll of the pointer @p axis with @p delta.
     **/
    void requestPointerAxis(Qt::Orientation axis, qreal delta);
    /**
     * Request a touch down at @p pos in global coordinates.
     *
     * If this is the first touch down it starts a touch sequence.
     * @param id The id to identify the touch point
     * @param pos The global position of the touch point
     * @see requestTouchMotion
     * @see requestTouchUp
     * @since 5.23
     **/
    void requestTouchDown(quint32 id, const QPointF &pos);
    /**
     * Request a move of the touch point identified by @p id to new global @p pos.
     * @param id The id to identify the touch point
     * @param pos The global position of the touch point
     * @see requestTouchDown
     * @since 5.23
     **/
    void requestTouchMotion(quint32 id, const QPointF &pos);
    /**
     * Requests a touch up of the touch point identified by @p id.
     * @param id The id to identify the touch point
     * @since 5.23
     **/
    void requestTouchUp(quint32 id);
    /**
     * Requests to cancel the current touch event sequence.
     * @since 5.23
     **/
    void requestTouchCancel();
    /**
     * Requests a touch frame. This allows to manipulate multiple touch points in one
     * event and notify that the set of touch events for the current frame are finished.
     * @since 5.23
     **/
    void requestTouchFrame();

    /**
     * Request a keyboard key press.
     * @param linuxButton The button code as defined in linux/input-event-codes.h
     *
     * @since 5.63
     **/
    void requestKeyboardKeyPress(quint32 linuxKey);
    /**
     * Request a keyboard button release.
     * @param linuxButton The button code as defined in linux/input-event-codes.h
     *
     * @since 5.63
     **/
    void requestKeyboardKeyRelease(quint32 linuxKey);

    operator org_kde_kwin_fake_input *();
    operator org_kde_kwin_fake_input *() const;

Q_SIGNALS:
    /**
     * The corresponding global for this interface on the Registry got removed.
     *
     * This signal gets only emitted if the Compositor got created by
     * Registry::createFakeInput
     *
     * @since 5.5
     **/
    void removed();

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

}
}

#endif