/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
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** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
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** $QT_END_LICENSE$
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****************************************************************************/

#include "rendertechnique_p.h"

#include <Qt3DRenderer/qrenderpass.h>
#include <Qt3DRenderer/qparameter.h>
#include <Qt3DRenderer/qtechnique.h>
#include <Qt3DRenderer/qopenglfilter.h>
#include <Qt3DRenderer/private/renderer_p.h>
#include <Qt3DRenderer/private/renderannotation_p.h>
#include <Qt3DRenderer/private/rendershader_p.h>
#include <Qt3DCore/private/qaspectmanager_p.h>
#include <Qt3DCore/private/qchangearbiter_p.h>
#include <Qt3DCore/qscenepropertychange.h>

#include <QDebug>

QT_BEGIN_NAMESPACE

namespace Qt3D {
namespace Render {

RenderTechnique::RenderTechnique()
    : QBackendNode()
    , m_openglFilter(new QOpenGLFilter())
{
}

RenderTechnique::~RenderTechnique()
{
    cleanup();
    delete m_openglFilter;
}

void RenderTechnique::cleanup()
{
}

void RenderTechnique::updateFromPeer(QNode *peer)
{
    m_parameterPack.clear();
    m_renderPasses.clear();
    m_annotationList.clear();

    QTechnique *technique = static_cast<QTechnique *>(peer);

    if (technique != Q_NULLPTR) {
        Q_FOREACH (QParameter *p, technique->parameters())
            m_parameterPack.appendParameter(p->id());
        Q_FOREACH (QRenderPass *rPass, technique->renderPasses())
            appendRenderPass(rPass->id());
        Q_FOREACH (QAnnotation *annotation, technique->annotations())
            appendAnnotation(annotation->id());

        // Copy OpenGLFilter info from frontend OpenGLFilter
        QOpenGLFilter *peerFilter = technique->openGLFilter();
        m_openglFilter->copy(*peerFilter);
    }
}

void RenderTechnique::sceneChangeEvent(const QSceneChangePtr &e)
{
    QScenePropertyChangePtr propertyChange = qSharedPointerCast<QScenePropertyChange>(e);
    switch (e->type()) {

    case NodeUpdated: {
        if (propertyChange->propertyName() == QByteArrayLiteral("openGLFilter")) {
            QOpenGLFilter *filter = propertyChange->value().value<QOpenGLFilter *>();
            if (filter != Q_NULLPTR) {
                m_openglFilter->copy(*filter);
                delete filter;
            }
        }
        break;
    }

    case NodeAdded: {
        if (propertyChange->propertyName() == QByteArrayLiteral("pass")) {
            appendRenderPass(propertyChange->value().value<QNodeId>());
        }
        else if (propertyChange->propertyName() == QByteArrayLiteral("parameter")) {
            m_parameterPack.appendParameter(propertyChange->value().value<QNodeId>());
        }
        else if (propertyChange->propertyName() == QByteArrayLiteral("annotation")) {
            appendAnnotation(propertyChange->value().value<QNodeId>());
        }
        break;
    }

    case NodeRemoved: {
        if (propertyChange->propertyName() == QByteArrayLiteral("pass")) {
            removeRenderPass(propertyChange->value().value<QNodeId>());
        }
        else if (propertyChange->propertyName() == QByteArrayLiteral("parameter")) {
            m_parameterPack.removeParameter(propertyChange->value().value<QNodeId>());
        }
        else if (propertyChange->propertyName() == QByteArrayLiteral("annotation")) {
            removeAnnotation(propertyChange->value().value<QNodeId>());
        }
        break;
    }

    default:
        break;
    }
}

QList<QNodeId> RenderTechnique::parameters() const
{
    return m_parameterPack.parameters();
}

void RenderTechnique::appendRenderPass(const QNodeId &renderPassId)
{
    if (!m_renderPasses.contains(renderPassId))
        m_renderPasses.append(renderPassId);
}

void RenderTechnique::removeRenderPass(const QNodeId &renderPassId)
{
    m_renderPasses.removeOne(renderPassId);
}

QList<QNodeId> RenderTechnique::annotations() const
{
    return m_annotationList;
}

QList<QNodeId> RenderTechnique::renderPasses() const
{
    return m_renderPasses;
}

QOpenGLFilter *RenderTechnique::openGLFilter() const
{
    return m_openglFilter;
}

void RenderTechnique::appendAnnotation(const QNodeId &criterionId)
{
    if (!m_annotationList.contains(criterionId))
        m_annotationList.append(criterionId);
}

void RenderTechnique::removeAnnotation(const QNodeId &criterionId)
{
    m_annotationList.removeOne(criterionId);
}

} // namespace Render
} // namespace Qt3D

QT_END_NAMESPACE