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

Copyright (C) 2014 Martin Gräßlin <mgraesslin@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 "compositor_interface.h"
#include "display.h"
#include "surface_interface.h"

namespace KWin
{
namespace WaylandServer
{

static const quint32 s_version = 3;

const struct wl_compositor_interface CompositorInterface::s_interface = {
    CompositorInterface::createSurfaceCallback,
    CompositorInterface::createRegionCallback
};

CompositorInterface::CompositorInterface(Display *display, QObject *parent)
    : QObject(parent)
    , m_display(display)
    , m_compositor(nullptr)
{
}

CompositorInterface::~CompositorInterface()
{
    destroy();
}

void CompositorInterface::create()
{
    Q_ASSERT(!m_compositor);
    m_compositor = wl_global_create(*m_display, &wl_compositor_interface, s_version, this, CompositorInterface::bind);
}

void CompositorInterface::destroy()
{
    if (!m_compositor) {
        return;
    }
    wl_global_destroy(m_compositor);
    m_compositor = nullptr;
}

void CompositorInterface::bind(wl_client *client, void *data, uint32_t version, uint32_t id)
{
    CompositorInterface *compositor = reinterpret_cast<CompositorInterface*>(data);
    compositor->bind(client, version, id);
}

void CompositorInterface::bind(wl_client *client, uint32_t version, uint32_t id)
{
    wl_resource *resource = wl_resource_create(client, &wl_compositor_interface, qMin(version, s_version), id);
    if (!resource) {
        wl_client_post_no_memory(client);
        return;
    }
    wl_resource_set_implementation(resource, &CompositorInterface::s_interface, this, CompositorInterface::unbind);
    // TODO: should we track?
}

void CompositorInterface::unbind(wl_resource *resource)
{
    Q_UNUSED(resource)
    // TODO: implement?
}

void CompositorInterface::createSurfaceCallback(wl_client *client, wl_resource *resource, uint32_t id)
{
    CompositorInterface::cast(resource)->createSurface(client, resource, id);
}

void CompositorInterface::createSurface(wl_client *client, wl_resource *resource, uint32_t id)
{
    SurfaceInterface *surface = new SurfaceInterface(this);
    surface->create(client, wl_resource_get_version(resource), id);
    if (!surface->surface()) {
        wl_resource_post_no_memory(resource);
        delete surface;
        return;
    }
    emit surfaceCreated(surface);
}

void CompositorInterface::createRegionCallback(wl_client *client, wl_resource *resource, uint32_t id)
{
    CompositorInterface::cast(resource)->createRegion(client, resource, id);
}

void CompositorInterface::createRegion(wl_client *client, wl_resource *resource, uint32_t id)
{
    Q_UNUSED(client)
    Q_UNUSED(resource)
    Q_UNUSED(id)
    // TODO: implement
}

}
}