/********************************************************************
Copyright 2014  Martin Gräßlin <mgraesslin@kde.org>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) version 3, or any
later version accepted by the membership of KDE e.V. (or its
successor approved by the membership of KDE e.V.), which shall
act as a proxy defined in Section 6 of version 3 of the license.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#ifndef WAYLAND_SERVER_DISPLAY_H
#define WAYLAND_SERVER_DISPLAY_H

#include <QList>
#include <QObject>

#include <KWayland/Server/kwaylandserver_export.h>

#include "clientconnection.h"

struct wl_client;
struct wl_display;
struct wl_event_loop;

namespace KWayland
{
namespace Server
{

class CompositorInterface;
class DataDeviceManagerInterface;
class OutputInterface;
class PlasmaShellInterface;
class SeatInterface;
class ShellInterface;
class SubCompositorInterface;

class KWAYLANDSERVER_EXPORT Display : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString socketName READ socketName WRITE setSocketName NOTIFY socketNameChanged)
    Q_PROPERTY(bool running READ isRunning NOTIFY runningChanged)
public:
    explicit Display(QObject *parent = nullptr);
    virtual ~Display();

    void setSocketName(const QString &name);
    QString socketName() const;

    quint32 serial();
    quint32 nextSerial();

    /**
     * How to setup the server connection.
     * @li ConnectToSocket: the server will open the socket identified by the socket name
     * @li ConnectClientsOnly: only connections through createClient are possible
     **/
    enum class StartMode {
        ConnectToSocket,
        ConnectClientsOnly
    };
    void start(StartMode mode = StartMode::ConnectToSocket);
    void terminate();
    /**
     * Starts the event loop for the server socket.
     * This method should only be used if start() is used before creating the
     * QCoreApplication. In that case start() cannot fully setup the event processing
     * and the loop needs to be started after the QCoreApplication got created.
     * @see start
     * @see dispatchEvents
     **/
    void startLoop();
    /**
     * Dispatches pending events in a blocking way. May only be used if the Display is
     * created and started before the QCoreApplication is created. Once the QCoreApplication
     * is created and the event loop is started this method delegates to the normal dispatch
     * handling.
     * @see startLoop
     **/
    void dispatchEvents(int msecTimeout = -1);

    /**
     * Create a client for the given file descriptor.
     *
     * The client is created as if it connected through the normal server
     * socket. This method can be used to create a connection bypassing the
     * normal socket connection. It's recommended to use together with
     * socketpair and pass the other side of the socket to the client.
     *
     * @param fd The file descriptor for the socket to the client
     * @returns The new ClientConnection or @c null on failure.
     **/
    ClientConnection *createClient(int fd);

    operator wl_display*();
    operator wl_display*() const;
    bool isRunning() const;

    OutputInterface *createOutput(QObject *parent = nullptr);
    void removeOutput(OutputInterface *output);
    QList<OutputInterface*> outputs() const;

    CompositorInterface *createCompositor(QObject *parent = nullptr);
    void createShm();
    ShellInterface *createShell(QObject *parent = nullptr);
    SeatInterface *createSeat(QObject *parent = nullptr);
    SubCompositorInterface *createSubCompositor(QObject *parent = nullptr);
    DataDeviceManagerInterface *createDataDeviceManager(QObject *parent = nullptr);
    PlasmaShellInterface *createPlasmaShell(QObject *parent = nullptr);

    /**
     * Gets the ClientConnection for the given @p client.
     * If there is no ClientConnection yet for the given @p client, it will be created.
     * @param client The native client for which the ClientConnection is retrieved
     * @return The ClientConnection for the given native client
     **/
    ClientConnection *getConnection(wl_client *client);
    QVector<ClientConnection*> connections() const;

    /**
     * Set the EGL @p display for this Wayland display.
     * The EGLDisplay can only be set once and must be alive as long as the Wayland display
     * is alive. The user should have set up the binding between the EGLDisplay and the
     * Wayland display prior to calling this method.
     *
     * @see eglDisplay
     * @since 5.3
     **/
    void setEglDisplay(void *display);
    /**
     * @returns the EGLDisplay used for this Wayland display or EGL_NO_DISPLAY if not set.
     * @see setEglDisplay
     * @since 5.3
     **/
    void *eglDisplay() const;

Q_SIGNALS:
    void socketNameChanged(const QString&);
    void runningChanged(bool);
    void aboutToTerminate();
    void clientConnected(KWayland::Server::ClientConnection*);
    void clientDisconnected(KWayland::Server::ClientConnection*);

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

}
}

#endif