/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

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 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

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#include <sdr/contact/viewcontactofe3d.hxx>

#include <sdr/contact/viewobjectcontactofe3d.hxx>

#include <svx/obj3d.hxx>

#include <drawinglayer/primitive2d/embedded3dprimitive2d.hxx>

#include <svx/sdr/contact/viewcontactofe3dscene.hxx>

#include <svx/scene3d.hxx>

#include <drawinglayer/primitive3d/transformprimitive3d.hxx>

#include <drawinglayer/attribute/sdrsceneattribute3d.hxx>

#include <drawinglayer/attribute/sdrlightingattribute3d.hxx>

#include <drawinglayer/attribute/sdrlightattribute3d.hxx>

namespace {

const sdr::contact::ViewContactOfE3dScene* tryToFindVCOfE3DScene(

    const sdr::contact::ViewContact& rCandidate,

    basegfx::B3DHomMatrix& o_rInBetweenObjectTransform)

{

    const sdr::contact::ViewContactOfE3dScene* pSceneParent =

        dynamic_cast< const sdr::contact::ViewContactOfE3dScene* >(rCandidate.GetParentContact());

    if(pSceneParent)

    {

        // each 3d object (including in-between scenes) should have a scene as parent

        const sdr::contact::ViewContactOfE3dScene* pSceneParentParent =

            dynamic_cast< const sdr::contact::ViewContactOfE3dScene* >(pSceneParent->GetParentContact());

        if(pSceneParentParent)

        {

            // the parent scene of rCandidate is an in-between scene, call recursively and collect

            // the in-between scene's object transformation part in o_rInBetweenObjectTransform

            const basegfx::B3DHomMatrix& rSceneParentTransform = pSceneParent->GetE3dScene().GetTransform();

            o_rInBetweenObjectTransform = rSceneParentTransform * o_rInBetweenObjectTransform;

            return tryToFindVCOfE3DScene(*pSceneParent, o_rInBetweenObjectTransform);

        }

        else

        {

            // the parent scene is the outmost scene

            return pSceneParent;

        }

    }

    // object hierarchy structure is incorrect; no result

    return nullptr;

}

} // end of anonymous namespace

namespace sdr::contact {

drawinglayer::primitive2d::Primitive2DContainer ViewContactOfE3d::impCreateWithGivenPrimitive3DContainer(

    const drawinglayer::primitive3d::Primitive3DContainer& rxContent3D) const

{

    drawinglayer::primitive2d::Primitive2DContainer xRetval;

    if(!rxContent3D.empty())

    {

        // try to get the outmost ViewObjectContactOfE3dScene for this single 3d object,

        // the ones on the way there are grouping scenes. Collect the in-between scene's

        // transformations to build a correct object transformation for the embedded

        // object

        basegfx::B3DHomMatrix aInBetweenObjectTransform;

        const ViewContactOfE3dScene* pVCOfE3DScene = tryToFindVCOfE3DScene(*this, aInBetweenObjectTransform);

        if(pVCOfE3DScene)

        {

            basegfx::B3DVector aLightNormal;

            const double fShadowSlant(pVCOfE3DScene->getSdrSceneAttribute().getShadowSlant());

            const basegfx::B3DRange aAllContentRange = pVCOfE3DScene->getAllContentRange3D();

            drawinglayer::geometry::ViewInformation3D aViewInformation3D(pVCOfE3DScene->getViewInformation3D());

            if(!pVCOfE3DScene->getSdrLightingAttribute().getLightVector().empty())

            {

                // get light normal from first light and normalize

                aLightNormal = pVCOfE3DScene->getSdrLightingAttribute().getLightVector()[0].getDirection();

                aLightNormal.normalize();

            }

            if(!aInBetweenObjectTransform.isIdentity())

            {

                // if aInBetweenObjectTransform is used, create combined ViewInformation3D which

                // contains the correct object transformation for the embedded 3d object

                aViewInformation3D = drawinglayer::geometry::ViewInformation3D(

                    aViewInformation3D.getObjectTransformation() * aInBetweenObjectTransform,

                    aViewInformation3D.getOrientation(),

                    aViewInformation3D.getProjection(),

                    aViewInformation3D.getDeviceToView(),

                    aViewInformation3D.getViewTime(),

                    aViewInformation3D.getExtendedInformationSequence());

            }

            // create embedded 2d primitive and add. LightNormal and ShadowSlant are needed for evtl.

            // 3D shadow extraction for correct B2DRange calculation (shadow is part of the object)

            const drawinglayer::primitive2d::Primitive2DReference xReference(

                new drawinglayer::primitive2d::Embedded3DPrimitive2D(

                    rxContent3D,

                    pVCOfE3DScene->getObjectTransformation(),

                    std::move(aViewInformation3D),

                    aLightNormal,

                    fShadowSlant,

                    aAllContentRange));

            xRetval = drawinglayer::primitive2d::Primitive2DContainer { xReference };

        }

    }

    return xRetval;

}

ViewContactOfE3d::ViewContactOfE3d(E3dObject& rSdrObject)

:   ViewContactOfSdrObj(rSdrObject)

{

}

ViewContactOfE3d::~ViewContactOfE3d()

{

}

drawinglayer::primitive3d::Primitive3DContainer const & ViewContactOfE3d::getVIP3DSWithoutObjectTransform() const

{

    // local up-to-date checks. Create new list and compare.

    drawinglayer::primitive3d::Primitive3DContainer xNew(createViewIndependentPrimitive3DContainer());

    if(mxViewIndependentPrimitive3DContainer != xNew)

    {

        // has changed, copy content

        const_cast< ViewContactOfE3d* >(this)->mxViewIndependentPrimitive3DContainer = std::move(xNew);

    }

    // return current Primitive2DContainer

    return mxViewIndependentPrimitive3DContainer;

}

drawinglayer::primitive3d::Primitive3DContainer ViewContactOfE3d::getViewIndependentPrimitive3DContainer() const

{

    // get sequence without object transform

    drawinglayer::primitive3d::Primitive3DContainer xRetval(getVIP3DSWithoutObjectTransform());

    if(!xRetval.empty())

    {

        // add object transform if it's used

        const basegfx::B3DHomMatrix& rObjectTransform(GetE3dObject().GetTransform());

        if(!rObjectTransform.isIdentity())

        {

            const drawinglayer::primitive3d::Primitive3DReference xReference(

                new drawinglayer::primitive3d::TransformPrimitive3D(

                    rObjectTransform,

                    xRetval));

            xRetval = { xReference };

        }

    }

    // return current Primitive2DContainer

    return xRetval;

}

void ViewContactOfE3d::createViewIndependentPrimitive2DSequence(drawinglayer::primitive2d::Primitive2DDecompositionVisitor& rVisitor) const

{

    // also need to create a 2D embedding when the view-independent part is requested,

    // see view-dependent part in ViewObjectContactOfE3d::createPrimitive2DSequence

    // get 3d primitive vector, isPrimitiveVisible() is done in 3d creator

    return rVisitor.visit(impCreateWithGivenPrimitive3DContainer(getViewIndependentPrimitive3DContainer()));

}

ViewObjectContact& ViewContactOfE3d::CreateObjectSpecificViewObjectContact(ObjectContact& rObjectContact)

{

    ViewObjectContact* pRetval = new ViewObjectContactOfE3d(rObjectContact, *this);

    DBG_ASSERT(pRetval, "ViewContactOfE3d::CreateObjectSpecificViewObjectContact() failed (!)");

    return *pRetval;

}

}

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