/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program 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 General Public License for more details.

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

#include "subsurfacemonitor.h"

#include <KWaylandServer/subcompositor_interface.h>
#include <KWaylandServer/surface_interface.h>

using namespace KWaylandServer;

namespace KWin
{

SubSurfaceMonitor::SubSurfaceMonitor(SurfaceInterface *surface, QObject *parent)
    : QObject(parent)
{
    registerSurface(surface);
}

void SubSurfaceMonitor::registerSubSurface(SubSurfaceInterface *subSurface)
{
    SurfaceInterface *surface = subSurface->surface();

    connect(subSurface, &SubSurfaceInterface::positionChanged,
            this, &SubSurfaceMonitor::subSurfaceMoved);
    connect(surface, &SurfaceInterface::sizeChanged,
            this, &SubSurfaceMonitor::subSurfaceResized);
    connect(surface, &SurfaceInterface::mapped,
            this, &SubSurfaceMonitor::subSurfaceMapped);
    connect(surface, &SurfaceInterface::unmapped,
            this, &SubSurfaceMonitor::subSurfaceUnmapped);

    registerSurface(surface);
}

void SubSurfaceMonitor::unregisterSubSurface(SubSurfaceInterface *subSurface)
{
    SurfaceInterface *surface = subSurface->surface();
    if (!surface)
        return;

    disconnect(subSurface, &SubSurfaceInterface::positionChanged,
               this, &SubSurfaceMonitor::subSurfaceMoved);
    disconnect(surface, &SurfaceInterface::sizeChanged,
               this, &SubSurfaceMonitor::subSurfaceResized);
    disconnect(surface, &SurfaceInterface::mapped,
               this, &SubSurfaceMonitor::subSurfaceMapped);
    disconnect(surface, &SurfaceInterface::unmapped,
               this, &SubSurfaceMonitor::subSurfaceUnmapped);

    unregisterSurface(surface);
}

void SubSurfaceMonitor::registerSurface(SurfaceInterface *surface)
{
    connect(surface, &SurfaceInterface::childSubSurfaceAdded,
            this, &SubSurfaceMonitor::subSurfaceAdded);
    connect(surface, &SurfaceInterface::childSubSurfaceRemoved,
            this, &SubSurfaceMonitor::subSurfaceRemoved);
    connect(surface, &SurfaceInterface::childSubSurfaceAdded,
            this, &SubSurfaceMonitor::registerSubSurface);
    connect(surface, &SurfaceInterface::childSubSurfaceRemoved,
            this, &SubSurfaceMonitor::unregisterSubSurface);
}

void SubSurfaceMonitor::unregisterSurface(SurfaceInterface *surface)
{
    disconnect(surface, &SurfaceInterface::childSubSurfaceAdded,
               this, &SubSurfaceMonitor::subSurfaceAdded);
    disconnect(surface, &SurfaceInterface::childSubSurfaceRemoved,
               this, &SubSurfaceMonitor::subSurfaceRemoved);
    disconnect(surface, &SurfaceInterface::childSubSurfaceAdded,
               this, &SubSurfaceMonitor::registerSubSurface);
    disconnect(surface, &SurfaceInterface::childSubSurfaceRemoved,
               this, &SubSurfaceMonitor::unregisterSubSurface);
}

} // namespace KWin