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#include "rendersurfaceselector_p.h"
#include <Qt3DRender/qrendersurfaceselector.h>
#include <Qt3DRender/private/qrendersurfaceselector_p.h>
#include <Qt3DCore/qpropertyupdatedchange.h>

#include <QtGui/qwindow.h>
#include <QtGui/qscreen.h>
#include <QtGui/qoffscreensurface.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace {

QSurface *surfaceFromQObject(QObject *o)
{
    QSurface *surface = nullptr;
    QWindow *window = qobject_cast<QWindow *>(o);
    if (window) {
        surface = static_cast<QSurface *>(window);
    } else {
        QOffscreenSurface *offscreen = qobject_cast<QOffscreenSurface *>(o);
        if (offscreen)
            surface = static_cast<QSurface *>(offscreen);
    }
    return surface;
}

}

namespace Qt3DRender {
namespace Render {

RenderSurfaceSelector::RenderSurfaceSelector()
    : FrameGraphNode(FrameGraphNode::Surface)
    , m_surface(nullptr)
    , m_width(0)
    , m_height(0)
    , m_devicePixelRatio(0.0f)
{
}

void RenderSurfaceSelector::initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change)
{
    FrameGraphNode::initializeFromPeer(change);
    const auto typedChange = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<QRenderSurfaceSelectorData>>(change);
    const auto &data = typedChange->data;
    m_surface = surfaceFromQObject(data.surface);
    m_renderTargetSize = data.externalRenderTargetSize;
    m_devicePixelRatio = data.surfacePixelRatio;

    if (m_surface && m_surface->surfaceClass() == QSurface::Window) {
        QWindow *window = static_cast<QWindow *>(m_surface);
        m_width = window->width();
        m_height = window->height();
    }
}

void RenderSurfaceSelector::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e)
{
    qCDebug(Render::Framegraph) << Q_FUNC_INFO;
    if (e->type() == PropertyUpdated) {
        QPropertyUpdatedChangePtr propertyChange = qSharedPointerCast<QPropertyUpdatedChange>(e);
        if (propertyChange->propertyName() == QByteArrayLiteral("surface")) {
            m_surface = surfaceFromQObject(propertyChange->value().value<QObject *>());
            markDirty(AbstractRenderer::FrameGraphDirty);
        } else if (propertyChange->propertyName() == QByteArrayLiteral("externalRenderTargetSize")) {
            setRenderTargetSize(propertyChange->value().toSize());
            markDirty(AbstractRenderer::FrameGraphDirty);
        } else if (propertyChange->propertyName() == QByteArrayLiteral("width")) {
            m_width = propertyChange->value().toInt();
            markDirty(AbstractRenderer::FrameGraphDirty);
        } else if (propertyChange->propertyName() == QByteArrayLiteral("height")) {
            m_height = propertyChange->value().toInt();
            markDirty(AbstractRenderer::FrameGraphDirty);
        } else if (propertyChange->propertyName() == QByteArrayLiteral("surfacePixelRatio")) {
            m_devicePixelRatio = propertyChange->value().toFloat();
            markDirty(AbstractRenderer::FrameGraphDirty);
        }
    }
    FrameGraphNode::sceneChangeEvent(e);
}

QSize RenderSurfaceSelector::renderTargetSize() const
{
    if (m_renderTargetSize.isValid())
        return m_renderTargetSize;
    {
        SurfaceLocker lock(m_surface);
        if (lock.isSurfaceValid() && m_surface && m_surface->size().isValid())
            return m_surface->size();
    }
    return QSize();
}

} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE
