/****************************************************************************
**
** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include <QtTest/QTest>
#include <qbackendnodetester.h>
#include <Qt3DRender/QLevelOfDetail>
#include <Qt3DRender/QBoundingSphere>
#include <Qt3DRender/private/levelofdetail_p.h>
#include <Qt3DRender/private/qlevelofdetail_p.h>
#include <Qt3DCore/qpropertyupdatedchange.h>
#include <Qt3DCore/private/qbackendnode_p.h>
#include "testpostmanarbiter.h"
#include "testrenderer.h"

class tst_LevelOfDetail : public Qt3DCore::QBackendNodeTester
{
    Q_OBJECT
private Q_SLOTS:

    void checkPeerPropertyMirroring()
    {
        // GIVEN
        Qt3DRender::Render::LevelOfDetail renderLod;
        Qt3DRender::QLevelOfDetail lod;

        // WHEN
        simulateInitialization(&lod, &renderLod);

        // THEN
        QCOMPARE(renderLod.peerId(), lod.id());
        QVERIFY(renderLod.camera().isNull() && lod.camera() == nullptr);
        QCOMPARE(renderLod.currentIndex(), lod.currentIndex());
        QCOMPARE(renderLod.thresholdType(), lod.thresholdType());
        QCOMPARE(renderLod.thresholds(), lod.thresholds());
        QCOMPARE(renderLod.center(), lod.volumeOverride()->center());
        QCOMPARE(renderLod.radius(), lod.volumeOverride()->radius());
    }

    void checkInitialAndCleanedUpState()
    {
        // GIVEN
        Qt3DRender::Render::LevelOfDetail renderLod;
        TestRenderer renderer;

        // THEN
        QCOMPARE(renderLod.camera(), Qt3DCore::QNodeId{});
        QCOMPARE(renderLod.currentIndex(), 0);
        QCOMPARE(renderLod.thresholdType(), Qt3DRender::QLevelOfDetail::DistanceToCamera);
        QVERIFY(renderLod.thresholds().empty());
        QCOMPARE(renderLod.radius(), 1.f);
        QCOMPARE(renderLod.center(), QVector3D{});
        QVERIFY(renderLod.peerId().isNull());

        // GIVEN
        Qt3DRender::QLevelOfDetail lod;
        lod.setThresholdType(Qt3DRender::QLevelOfDetail::ProjectedScreenPixelSize);

        // WHEN
        renderLod.setRenderer(&renderer);
        simulateInitialization(&lod, &renderLod);

        // THEN
        QCOMPARE(renderLod.thresholdType(), lod.thresholdType());
    }

    void checkPropertyChanges()
    {
        // GIVEN
        TestRenderer renderer;
        Qt3DRender::Render::LevelOfDetail renderLod;
        renderLod.setRenderer(&renderer);

        // THEN
        QVERIFY(renderLod.thresholdType() != Qt3DRender::QLevelOfDetail::ProjectedScreenPixelSize);
        QVERIFY(renderLod.camera().isNull());

        {
            // WHEN
            Qt3DCore::QPropertyUpdatedChangePtr updateChange(new Qt3DCore::QPropertyUpdatedChange(Qt3DCore::QNodeId()));
            updateChange->setValue(static_cast<int>(Qt3DRender::QLevelOfDetail::ProjectedScreenPixelSize));
            updateChange->setPropertyName("thresholdType");
            renderLod.sceneChangeEvent(updateChange);

            // THEN
            QCOMPARE(renderLod.thresholdType(), Qt3DRender::QLevelOfDetail::ProjectedScreenPixelSize);
            QVERIFY(renderer.dirtyBits() != 0);
        }

        {
            QVector<qreal> thresholds = {20.f, 30.f, 40.f};
            QVariant v;
            v.setValue<decltype(thresholds)>(thresholds);

            // WHEN
            Qt3DCore::QPropertyUpdatedChangePtr updateChange(new Qt3DCore::QPropertyUpdatedChange(Qt3DCore::QNodeId()));
            updateChange->setValue(v);
            updateChange->setPropertyName("thresholds");
            renderLod.sceneChangeEvent(updateChange);

            // THEN
            QCOMPARE(renderLod.thresholds(), thresholds);
        }

        {
            // WHEN
            Qt3DCore::QPropertyUpdatedChangePtr updateChange(new Qt3DCore::QPropertyUpdatedChange(Qt3DCore::QNodeId()));
            updateChange->setValue(QVector3D(1., 2., 3.));
            updateChange->setPropertyName("center");
            renderLod.sceneChangeEvent(updateChange);

            // THEN
            QCOMPARE(renderLod.center(), QVector3D(1., 2., 3.));
        }
    }
};


QTEST_APPLESS_MAIN(tst_LevelOfDetail)

#include "tst_levelofdetail.moc"