/*
    SPDX-FileCopyrightText: 2018 David Edmundson <kde@davidedmundson.co.uk>

    SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#ifndef KWAYLAND_CLIENT_XDG_DECORATION_UNSTABLE_V1_H
#define KWAYLAND_CLIENT_XDG_DECORATION_UNSTABLE_V1_H

#include <QObject>

#include "KWayland/Client/kwaylandclient_export.h"

struct zxdg_decoration_manager_v1;
struct zxdg_toplevel_decoration_v1;

namespace KWayland
{
namespace Client
{
class EventQueue;
class XdgDecoration;
class XdgShellSurface;

/**
 * @short Wrapper for the zxdg_decoration_manager_v1 interface.
 *
 * This class provides a convenient wrapper for the zxdg_decoration_manager_v1 interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the XdgDecorationManager interface:
 * @code
 * XdgDecorationManager *c = registry->createXdgDecorationManager(name, version);
 * @endcode
 *
 * This creates the XdgDecorationManager and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 * XdgDecorationManager *c = new XdgDecorationManager;
 * c->setup(registry->bindXdgDecorationManager(name, version));
 * @endcode
 *
 * The XdgDecorationManager can be used as a drop-in replacement for any zxdg_decoration_manager_v1
 * pointer as it provides matching cast operators.
 *
 * If you use the QtWayland QPA you do not need to use this class.
 *
 * @see Registry
 * @since 5.54
 **/
class KWAYLANDCLIENT_EXPORT XdgDecorationManager : public QObject
{
    Q_OBJECT
public:
    /**
     * Creates a new XdgDecorationManager.
     * Note: after constructing the XdgDecorationManager it is not yet valid and one needs
     * to call setup. In order to get a ready to use XdgDecorationManager prefer using
     * Registry::createXdgDecorationManager.
     **/
    explicit XdgDecorationManager(QObject *parent = nullptr);
    ~XdgDecorationManager() override;

    /**
     * Setup this XdgDecorationManager to manage the @p xdgdecorationmanager.
     * When using Registry::createXdgDecorationManager there is no need to call this
     * method.
     **/
    void setup(zxdg_decoration_manager_v1 *xdgdecorationmanager);
    /**
     * @returns @c true if managing a zxdg_decoration_manager_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_decoration_manager_v1 interface.
     * After the interface has been released the XdgDecorationManager instance is no
     * longer valid and can be setup with another zxdg_decoration_manager_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this XdgDecorationManager.
     * 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 zxdg_decoration_manager_v1 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, xdgdecorationmanager, &XdgDecorationManager::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

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

    XdgDecoration *getToplevelDecoration(XdgShellSurface *toplevel, QObject *parent = nullptr);

    operator zxdg_decoration_manager_v1 *();
    operator zxdg_decoration_manager_v1 *() const;

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

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

class KWAYLANDCLIENT_EXPORT XdgDecoration : public QObject
{
    Q_OBJECT
public:
    enum class Mode {
        ClientSide,
        ServerSide,
    };

    Q_ENUM(Mode)

    ~XdgDecoration() override;

    /**
     * Setup this XdgDecoration to manage the @p xdgdecoration.
     * When using XdgDecorationManager::createXdgDecoration there is no need to call this
     * method.
     **/
    void setup(zxdg_toplevel_decoration_v1 *xdgdecoration);
    /**
     * @returns @c true if managing a zxdg_toplevel_decoration_v1.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_toplevel_decoration_v1 interface.
     * After the interface has been released the XdgDecoration instance is no
     * longer valid and can be setup with another zxdg_toplevel_decoration_v1 interface.
     **/
    void release();
    /**
     * Destroys the data held by this XdgDecoration.
     * 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 zxdg_toplevel_decoration_v1 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, xdgdecoration, &XdgDecoration::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * @brief Request that the server puts us in a given mode. The compositor will respond with a modeChange
     * The compositor may ignore this request.
     */
    void setMode(Mode mode);

    /**
     * @brief Unset our requested mode. The compositor can then configure this surface with the default mode
     */
    void unsetMode();

    /**
     * The mode configured by the server.
     */
    Mode mode() const;

    operator zxdg_toplevel_decoration_v1 *();
    operator zxdg_toplevel_decoration_v1 *() const;

Q_SIGNALS:
    void modeChanged(KWayland::Client::XdgDecoration::Mode mode);

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

}
}

#endif