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

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

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

 *

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

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <svgtextnode.hxx>

#include <svgcharacternode.hxx>

#include <svgstyleattributes.hxx>

#include <svgtrefnode.hxx>

#include <svgtextpathnode.hxx>

#include <svgtspannode.hxx>

#include <osl/diagnose.h>

namespace svgio::svgreader

{

        SvgTextNode::SvgTextNode(

            SvgDocument& rDocument,

            SvgNode* pParent)

        :   SvgTspanNode(SVGToken::Text, rDocument, pParent)

        {

        }

        SvgTextNode::~SvgTextNode()

        {

        }

        void SvgTextNode::parseAttribute(SVGToken aSVGToken, const OUString& aContent)

        {

            // call parent

            SvgTspanNode::parseAttribute(aSVGToken, aContent);

            // parse own

            switch(aSVGToken)

            {

                case SVGToken::Transform:

                {

                    const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));

                    if(!aMatrix.isIdentity())

                    {

                        setTransform(aMatrix);

                    }

                    break;

                }

                default:

                {

                    break;

                }

            }

        }

        void SvgTextNode::addTextPrimitives(

            const SvgNode& rCandidate,

            drawinglayer::primitive2d::Primitive2DContainer& rTarget,

            drawinglayer::primitive2d::Primitive2DContainer&& rSource)

        {

            if(rSource.empty())

                return;

            const SvgStyleAttributes* pAttributes = rCandidate.getSvgStyleAttributes();

            if(pAttributes)

            {

                // add text with taking all Fill/Stroke attributes into account

                pAttributes->add_text(rTarget, std::move(rSource));

            }

            else

            {

                // should not happen, every subnode from SvgTextNode will at least

                // return the attributes from SvgTextNode. Nonetheless, add text

                rTarget.append(std::move(rSource));

            }

        }

        void SvgTextNode::DecomposeChild(const SvgNode& rCandidate, drawinglayer::primitive2d::Primitive2DContainer& rTarget, SvgTextPosition& rSvgTextPosition) const

        {

            switch(rCandidate.getType())

            {

                case SVGToken::Character:

                {

                    // direct SvgTextPathNode derivates, decompose them

                    const SvgCharacterNode& rSvgCharacterNode = static_cast< const SvgCharacterNode& >(rCandidate);

                    rSvgCharacterNode.decomposeText(rTarget, rSvgTextPosition);

                    break;

                }

                case SVGToken::TextPath:

                {

                    // direct TextPath decompose

                    const SvgTextPathNode& rSvgTextPathNode = static_cast< const SvgTextPathNode& >(rCandidate);

                    const auto& rChildren = rSvgTextPathNode.getChildren();

                    const sal_uInt32 nCount(rChildren.size());

                    if(nCount && rSvgTextPathNode.isValid())

                    {

                        // remember original TextStart to later detect hor/ver offsets

                        const basegfx::B2DPoint aTextStart(rSvgTextPosition.getPosition());

                        drawinglayer::primitive2d::Primitive2DContainer aNewTarget;

                        // decompose to regular TextPrimitives

                        for(sal_uInt32 a(0); a < nCount; a++)

                        {

                            DecomposeChild(*rChildren[a], aNewTarget, rSvgTextPosition);

                        }

                        if(!aNewTarget.empty())

                        {

                            const drawinglayer::primitive2d::Primitive2DContainer aPathContent(aNewTarget);

                            aNewTarget.clear();

                            // dismantle TextPrimitives and map them on curve/path

                            rSvgTextPathNode.decomposePathNode(aPathContent, aNewTarget, aTextStart);

                        }

                        if(!aNewTarget.empty())

                        {

                            addTextPrimitives(rCandidate, rTarget, std::move(aNewTarget));

                        }

                    }

                    break;

                }

                case SVGToken::Tspan:

                {

                    // Tspan may have children, call recursively

                    const SvgTspanNode& rSvgTspanNode = static_cast< const SvgTspanNode& >(rCandidate);

                    const auto& rChildren = rSvgTspanNode.getChildren();

                    const sal_uInt32 nCount(rChildren.size());

                    if(nCount)

                    {

                        SvgTextPosition aSvgTextPosition(&rSvgTextPosition, rSvgTspanNode);

                        drawinglayer::primitive2d::Primitive2DContainer aNewTarget;

                        for(sal_uInt32 a(0); a < nCount; a++)

                        {

                            DecomposeChild(*rChildren[a], aNewTarget, aSvgTextPosition);

                        }

                        rSvgTextPosition.setPosition(aSvgTextPosition.getPosition());

                        if(!aNewTarget.empty())

                        {

                            addTextPrimitives(rCandidate, rTarget, std::move(aNewTarget));

                        }

                    }

                    break;

                }

                case SVGToken::Tref:

                {

                    const SvgTrefNode& rSvgTrefNode = static_cast< const SvgTrefNode& >(rCandidate);

                    const SvgTextNode* pRefText = rSvgTrefNode.getReferencedSvgTextNode();

                    if(pRefText)

                    {

                        const auto& rChildren = pRefText->getChildren();

                        const sal_uInt32 nCount(rChildren.size());

                        drawinglayer::primitive2d::Primitive2DContainer aNewTarget;

                        if(nCount)

                        {

                            for(sal_uInt32 a(0); a < nCount; a++)

                            {

                                const SvgNode& rChildCandidate = *rChildren[a];

                                const_cast< SvgNode& >(rChildCandidate).setAlternativeParent(this);

                                DecomposeChild(rChildCandidate, aNewTarget, rSvgTextPosition);

                                const_cast< SvgNode& >(rChildCandidate).setAlternativeParent();

                            }

                            if(!aNewTarget.empty())

                            {

                                addTextPrimitives(rCandidate, rTarget, std::move(aNewTarget));

                            }

                        }

                    }

                    break;

                }

                default:

                {

                    OSL_ENSURE(false, "Unexpected node in text token (!)");

                    break;

                }

            }

        }

        void SvgTextNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool /*bReferenced`*/) const

        {

            // text has a group of child nodes, allowed are SVGToken::Character, SVGToken::Tspan,

            // SVGToken::Tref and SVGToken::TextPath. These increase a given current text position

            const SvgStyleAttributes* pStyle = getSvgStyleAttributes();

            if(!pStyle || getChildren().empty())

                return;

            const double fOpacity(pStyle->getOpacity().getNumber());

            if(fOpacity <= 0.0)

                return;

            SvgTextPosition aSvgTextPosition(nullptr, *this);

            drawinglayer::primitive2d::Primitive2DContainer aNewTarget;

            const auto& rChildren = getChildren();

            const sal_uInt32 nCount(rChildren.size());

            for(sal_uInt32 a(0); a < nCount; a++)

            {

                const SvgNode& rCandidate = *rChildren[a];

                DecomposeChild(rCandidate, aNewTarget, aSvgTextPosition);

            }

            if(!aNewTarget.empty())

            {

                drawinglayer::primitive2d::Primitive2DContainer aNewTarget2;

                addTextPrimitives(*this, aNewTarget2, std::move(aNewTarget));

                aNewTarget = std::move(aNewTarget2);

            }

            if(!aNewTarget.empty())

            {

                pStyle->add_postProcess(rTarget, std::move(aNewTarget), getTransform());

            }

        }

} // end of namespace svgio::svgreader

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