/****************************************************************************
**
** Copyright (C) 2016 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 <Qt3DRender/qrendertarget.h>
#include <Qt3DRender/qrendertargetoutput.h>
#include <Qt3DRender/private/qrendertarget_p.h>
#include <QObject>
#include <QSignalSpy>
#include <Qt3DCore/qpropertynodeaddedchange.h>
#include <Qt3DCore/qpropertynoderemovedchange.h>
#include <Qt3DCore/private/qnodecreatedchangegenerator_p.h>
#include <Qt3DCore/qnodecreatedchange.h>
#include "testpostmanarbiter.h"

class tst_QRenderTarget : public QObject
{
    Q_OBJECT

private Q_SLOTS:

    void checkDefaultConstruction()
    {
        // GIVEN
        Qt3DRender::QRenderTarget renderTarget;

        // THEN
        QVERIFY(renderTarget.outputs().empty());
    }

    void checkPropertyChanges()
    {
        // GIVEN
        Qt3DRender::QRenderTarget renderTarget;

        // WHEN
        Qt3DRender::QRenderTargetOutput output;

        renderTarget.addOutput(&output);

        // THEN
        QCOMPARE(renderTarget.outputs().size(), 1);

        // WHEN
        renderTarget.addOutput(&output);

        // THEN
        QCOMPARE(renderTarget.outputs().size(), 1);

        // WHEN
        renderTarget.removeOutput(&output);

        // THEN
        QCOMPARE(renderTarget.outputs().size(), 0);
    }

    void checkRenderTargetOutputBookkeeping()
    {
        // GIVEN
        Qt3DRender::QRenderTarget renderTarget;

        {
            // WHEN
            Qt3DRender::QRenderTargetOutput output;
            renderTarget.addOutput(&output);

            // THEN
            QCOMPARE(renderTarget.outputs().size(), 1);
        }

        // THEN -> should not crash
        QCOMPARE(renderTarget.outputs().size(), 0);
    }

    void checkCreationData()
    {
        // GIVEN
        Qt3DRender::QRenderTarget renderTarget;
        Qt3DRender::QRenderTargetOutput output;

        renderTarget.addOutput(&output);


        // WHEN
        QVector<Qt3DCore::QNodeCreatedChangeBasePtr> creationChanges;

        {
            Qt3DCore::QNodeCreatedChangeGenerator creationChangeGenerator(&renderTarget);
            creationChanges = creationChangeGenerator.creationChanges();
        }

        // THEN
        {
            QCOMPARE(creationChanges.size(), 2); // Target + Output

            const auto creationChangeData = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<Qt3DRender::QRenderTargetData>>(creationChanges.first());
            const Qt3DRender::QRenderTargetData cloneData = creationChangeData->data;

            QCOMPARE(renderTarget.id(), creationChangeData->subjectId());
            QCOMPARE(renderTarget.isEnabled(), true);
            QCOMPARE(renderTarget.isEnabled(), creationChangeData->isNodeEnabled());
            QCOMPARE(renderTarget.metaObject(), creationChangeData->metaObject());
            QCOMPARE(renderTarget.outputs().size(), cloneData.outputIds.size());
            QCOMPARE(output.id(), cloneData.outputIds.first());
        }

        // WHEN
        renderTarget.setEnabled(false);

        {
            Qt3DCore::QNodeCreatedChangeGenerator creationChangeGenerator(&renderTarget);
            creationChanges = creationChangeGenerator.creationChanges();
        }

        // THEN
        {
            QCOMPARE(creationChanges.size(), 2); // Target + Output

            const auto creationChangeData = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<Qt3DRender::QRenderTargetData>>(creationChanges.first());
            const Qt3DRender::QRenderTargetData cloneData = creationChangeData->data;

            QCOMPARE(renderTarget.id(), creationChangeData->subjectId());
            QCOMPARE(renderTarget.isEnabled(), false);
            QCOMPARE(renderTarget.isEnabled(), creationChangeData->isNodeEnabled());
            QCOMPARE(renderTarget.metaObject(), creationChangeData->metaObject());
            QCOMPARE(renderTarget.outputs().size(), cloneData.outputIds.size());
            QCOMPARE(output.id(), cloneData.outputIds.first());
        }
    }

    void checkRenderTargetOutputUpdate()
    {
        // GIVEN
        TestArbiter arbiter;
        Qt3DRender::QRenderTarget renderTarget;
        Qt3DRender::QRenderTargetOutput renderTargetOutput;
        arbiter.setArbiterOnNode(&renderTarget);

        {
            // WHEN
            renderTarget.addOutput(&renderTargetOutput);
            QCoreApplication::processEvents();

            // THEN
            QCOMPARE(arbiter.events.size(), 1);
            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyNodeAddedChange>();
            QCOMPARE(change->propertyName(), "output");
            QCOMPARE(change->addedNodeId(), renderTargetOutput.id());
            QCOMPARE(change->type(), Qt3DCore::PropertyValueAdded);

            arbiter.events.clear();
        }

        {
            // WHEN
            renderTarget.removeOutput(&renderTargetOutput);
            QCoreApplication::processEvents();

            // THEN
            QCOMPARE(arbiter.events.size(), 1);
            auto change = arbiter.events.first().staticCast<Qt3DCore::QPropertyNodeRemovedChange>();
            QCOMPARE(change->propertyName(), "output");
            QCOMPARE(change->removedNodeId(), renderTargetOutput.id());
            QCOMPARE(change->type(), Qt3DCore::PropertyValueRemoved);

            arbiter.events.clear();
        }
    }
};

QTEST_MAIN(tst_QRenderTarget)

#include "tst_qrendertarget.moc"