/*
    SPDX-FileCopyrightText: 2017 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_XDGFOREIGN_H
#define KWAYLAND_CLIENT_XDGFOREIGN_H

#include "surface.h"

#include <QObject>

#include "KWayland/Client/kwaylandclient_export.h"

struct zxdg_exporter_v2;
struct zxdg_importer_v2;
struct zxdg_exported_v2;
struct zxdg_imported_v2;

namespace KWayland
{
namespace Client
{
class EventQueue;
class Surface;
class XdgExported;
class XdgImported;

/**
 * @short Wrapper for the zxdg_exporter_v2 interface.
 *
 * This class provides a convenient wrapper for the zxdg_exporter_v2 interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the XdgExporter interface:
 * @code
 *  *c = registry->create(name, version);
 * @endcode
 *
 * This creates the XdgExporter and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 *  *c = new ;
 * c->setup(registry->bind(name, version));
 * @endcode
 *
 * The XdgExporter can be used as a drop-in replacement for any zxdg_exporter_v2
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 **/
class KWAYLANDCLIENT_EXPORT XdgExporter : public QObject
{
    Q_OBJECT
public:
    ~XdgExporter() override;

    /**
     * Setup this XdgExporter to manage the @p .
     * When using Registry::create there is no need to call this
     * method.
     **/
    void setup(zxdg_exporter_v2 *);
    /**
     * @returns @c true if managing a zxdg_exporter_v2.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_exporter_v2 interface.
     * After the interface has been released the XdgExporter instance is no
     * longer valid and can be setup with another zxdg_exporter_v2 interface.
     **/
    void release();
    /**
     * Destroys the data held by this .
     * 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_exporter_v2 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, , &::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

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

    /**
     * The export request exports the passed surface so that it can later be
     * imported via XdgImporter::importTopLevel.
     * A surface may be exported multiple times, and each exported handle may
     * be used to create an XdgImported multiple times.
     * @param surface the surface which we want to export an handle.
     * @param parent the parent in the QObject's hierarchy of the new XdgExported
     */
    XdgExported *exportTopLevel(Surface *surface, QObject *parent = nullptr);

    operator zxdg_exporter_v2 *();
    operator zxdg_exporter_v2 *() const;

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

protected:
    class Private;
    explicit XdgExporter(Private *p, QObject *parent = nullptr);
    QScopedPointer<Private> d;
};

/**
 * @short Wrapper for the zxdg_importer_v2 interface.
 *
 * This class provides a convenient wrapper for the zxdg_importer_v2 interface.
 *
 * To use this class one needs to interact with the Registry. There are two
 * possible ways to create the XdgImporter interface:
 * @code
 *  *c = registry->create(name, version);
 * @endcode
 *
 * This creates the XdgImporter and sets it up directly. As an alternative this
 * can also be done in a more low level way:
 * @code
 *  *c = new ;
 * c->setup(registry->bind(name, version));
 * @endcode
 *
 * The XdgImporter can be used as a drop-in replacement for any zxdg_importer_v2
 * pointer as it provides matching cast operators.
 *
 * @see Registry
 **/
class KWAYLANDCLIENT_EXPORT XdgImporter : public QObject
{
    Q_OBJECT
public:
    ~XdgImporter() override;

    /**
     * Setup this XdgImporter to manage the @p .
     * When using Registry::create there is no need to call this
     * method.
     **/
    void setup(zxdg_importer_v2 *);
    /**
     * @returns @c true if managing a zxdg_importer_v2.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_importer_v2 interface.
     * After the interface has been released the XdgImporter instance is no
     * longer valid and can be setup with another zxdg_importer_v2 interface.
     **/
    void release();
    /**
     * Destroys the data held by this .
     * 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_importer_v2 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, , &::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

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

    /**
     * Imports a surface from any client given a handle
     * retrieved by exporting said surface using XdgExporter::exportTopLevel.
     * When called, a new XdgImported object will be created.
     * This new object represents the imported surface, and the importing
     * client can manipulate its relationship using it.
     *
     * @param handle the unique handle that represent an exported toplevel surface.
     *               it has to have been generated by the XdgExporter by either this
     *               or some other process (which would have communicated the handle
     *               in some way, such as command line or a DBus call)
     * @param parent the parent in the QObject's hierarchy of the new XdgImported
     */
    XdgImported *importTopLevel(const QString &handle, QObject *parent = nullptr);

    operator zxdg_importer_v2 *();
    operator zxdg_importer_v2 *() const;

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

protected:
    class Private;
    explicit XdgImporter(Private *p, QObject *parent = nullptr);
    QScopedPointer<Private> d;
};

class KWAYLANDCLIENT_EXPORT XdgExported : public QObject
{
    Q_OBJECT
public:
    ~XdgExported() override;

    /**
     * Setup this XdgExported to manage the @p .
     * When using ::create there is no need to call this
     * method.
     **/
    void setup(zxdg_exported_v2 *);
    /**
     * @returns @c true if managing a zxdg_exported_v2.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_exported_v2 interface.
     * After the interface has been released the XdgExported instance is no
     * longer valid and can be setup with another zxdg_exported_v2 interface.
     **/
    void release();
    /**
     * Destroys the data held by this .
     * 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_exported_v2 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, , &::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * @returns The unique handle corresponding tho this exported surface.
     * Any process can import this toplevel surface provided they know this
     * unique string.
     */
    QString handle() const;

    operator zxdg_exported_v2 *();
    operator zxdg_exported_v2 *() const;

Q_SIGNALS:
    /**
     * Emitted when the exported window is fully initialized.
     * the handle will be valid at this point
     **/
    void done();

protected:
    friend class XdgExporter;
    class Private;
    explicit XdgExported(Private *p, QObject *parent = nullptr);
    QScopedPointer<Private> d;
};

class KWAYLANDCLIENT_EXPORT XdgImported : public QObject
{
    Q_OBJECT
public:
    ~XdgImported() override;

    /**
     * Setup this XdgImported to manage the @p .
     * When using ::create there is no need to call this
     * method.
     **/
    void setup(zxdg_imported_v2 *);
    /**
     * @returns @c true if managing a zxdg_imported_v2.
     **/
    bool isValid() const;
    /**
     * Releases the zxdg_imported_v2 interface.
     * After the interface has been released the XdgImported instance is no
     * longer valid and can be setup with another zxdg_imported_v2 interface.
     **/
    void release();
    /**
     * Destroys the data held by this .
     * 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_imported_v2 interface
     * once there is a new connection available.
     *
     * It is suggested to connect this method to ConnectionThread::connectionDied:
     * @code
     * connect(connection, &ConnectionThread::connectionDied, , &::destroy);
     * @endcode
     *
     * @see release
     **/
    void destroy();

    /**
     * Set the imported surface as the parent of some surface of the client.
     * The passed surface must be a toplevel xdg_surface.
     * Calling this function sets up a surface to surface relation with the same
     * stacking and positioning semantics as XdgShellSurface::setTransientFor
     *
     * @param surface the child surface, which must belong to this process.
     */
    void setParentOf(Surface *surface);

    operator zxdg_imported_v2 *();
    operator zxdg_imported_v2 *() const;

Q_SIGNALS:
    /**
     * Emitted when the imported surface is not valid anymore,
     * for instance because it's no longer exported on the other end
     */
    void importedDestroyed();

protected:
    friend class XdgImporter;
    class Private;
    explicit XdgImported(Private *p, QObject *parent = nullptr);
    QScopedPointer<Private> d;
};

}
}

#endif