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

    SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#include "subsurfacemonitor.h"

#include "wayland/subcompositor_interface.h"
#include "wayland/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);
    connect(surface, &SurfaceInterface::surfaceToBufferMatrixChanged,
            this, &SubSurfaceMonitor::subSurfaceSurfaceToBufferMatrixChanged);
    connect(surface, &SurfaceInterface::bufferSizeChanged,
            this, &SubSurfaceMonitor::subSurfaceBufferSizeChanged);
    connect(surface, &SurfaceInterface::committed,
            this, [this, subSurface]() {
                Q_EMIT subSurfaceCommitted(subSurface);
            });

    registerSurface(surface);
}

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

    disconnect(subSurface, nullptr, this, nullptr);

    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);

    const QList<SubSurfaceInterface *> below = surface->below();
    for (SubSurfaceInterface *childSubSurface : below) {
        registerSubSurface(childSubSurface);
    }

    const QList<SubSurfaceInterface *> above = surface->above();
    for (SubSurfaceInterface *childSubSurface : above) {
        registerSubSurface(childSubSurface);
    }
}

void SubSurfaceMonitor::unregisterSurface(SurfaceInterface *surface)
{
    disconnect(surface, nullptr, this, nullptr);
}

} // namespace KWin