/* -*- 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 <svgimagenode.hxx>

#include <svgdocument.hxx>

#include <tools/stream.hxx>

#include <vcl/bitmapex.hxx>

#include <vcl/graphicfilter.hxx>

#include <basegfx/matrix/b2dhommatrixtools.hxx>

#include <drawinglayer/primitive2d/bitmapprimitive2d.hxx>

#include <drawinglayer/primitive2d/transformprimitive2d.hxx>

#include <drawinglayer/primitive2d/maskprimitive2d.hxx>

#include <basegfx/polygon/b2dpolygontools.hxx>

#include <basegfx/polygon/b2dpolygon.hxx>

#include <rtl/uri.hxx>

#include <sal/log.hxx>

#include <drawinglayer/geometry/viewinformation2d.hxx>

#include <comphelper/base64.hxx>

#include <toolkit/helper/vclunohelper.hxx>

namespace svgio::svgreader

{

        SvgImageNode::SvgImageNode(

            SvgDocument& rDocument,

            SvgNode* pParent)

        :   SvgNode(SVGToken::Rect, rDocument, pParent),

            maSvgStyleAttributes(*this),

            maX(0),

            maY(0),

            maWidth(0),

            maHeight(0)

        {

        }

        SvgImageNode::~SvgImageNode()

        {

        }

        const SvgStyleAttributes* SvgImageNode::getSvgStyleAttributes() const

        {

            return checkForCssStyle(maSvgStyleAttributes);

        }

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

        {

            // call parent

            SvgNode::parseAttribute(aSVGToken, aContent);

            // read style attributes

            maSvgStyleAttributes.parseStyleAttribute(aSVGToken, aContent);

            // parse own

            switch(aSVGToken)

            {

                case SVGToken::Style:

                {

                    readLocalCssStyle(aContent);

                    break;

                }

                case SVGToken::PreserveAspectRatio:

                {

                    maSvgAspectRatio = readSvgAspectRatio(aContent);

                    break;

                }

                case SVGToken::Transform:

                {

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

                    if(!aMatrix.isIdentity())

                    {

                        setTransform(aMatrix);

                    }

                    break;

                }

                case SVGToken::X:

                {

                    SvgNumber aNum;

                    if(readSingleNumber(aContent, aNum))

                    {

                        maX = aNum;

                    }

                    break;

                }

                case SVGToken::Y:

                {

                    SvgNumber aNum;

                    if(readSingleNumber(aContent, aNum))

                    {

                        maY = aNum;

                    }

                    break;

                }

                case SVGToken::Width:

                {

                    SvgNumber aNum;

                    if(readSingleNumber(aContent, aNum))

                    {

                        if(aNum.isPositive())

                        {

                            maWidth = aNum;

                        }

                    }

                    break;

                }

                case SVGToken::Height:

                {

                    SvgNumber aNum;

                    if(readSingleNumber(aContent, aNum))

                    {

                        if(aNum.isPositive())

                        {

                            maHeight = aNum;

                        }

                    }

                    break;

                }

                case SVGToken::Href:

                case SVGToken::XlinkHref:

                {

                    const sal_Int32 nLen(aContent.getLength());

                    if(nLen)

                    {

                        readImageLink(aContent, maXLink, maUrl, maData);

                    }

                    break;

                }

                default:

                {

                    break;

                }

            }

        }

        static void extractFromGraphic(

            const Graphic& rGraphic,

            drawinglayer::primitive2d::Primitive2DContainer& rEmbedded,

            basegfx::B2DRange& rViewBox,

            BitmapEx& rBitmapEx)

        {

            if(GraphicType::Bitmap == rGraphic.GetType())

            {

                if(rGraphic.getVectorGraphicData())

                {

                    // embedded Svg

                    rEmbedded = rGraphic.getVectorGraphicData()->getPrimitive2DSequence();

                    // fill aViewBox

                    rViewBox = rGraphic.getVectorGraphicData()->getRange();

                }

                else

                {

                    // get bitmap

                    rBitmapEx = rGraphic.GetBitmapEx();

                }

            }

            else

            {

                // evtl. convert to bitmap

                rBitmapEx = rGraphic.GetBitmapEx();

            }

        }

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

        {

            // get size range and create path

            const SvgStyleAttributes* pStyle = getSvgStyleAttributes();

            if(!(pStyle && getWidth().isSet() && getHeight().isSet()))

                return;

            const double fWidth(getWidth().solve(*this, NumberType::xcoordinate));

            const double fHeight(getHeight().solve(*this, NumberType::ycoordinate));

            if(fWidth <= 0.0 || fHeight <= 0.0)

                return;

            BitmapEx aBitmapEx;

            drawinglayer::primitive2d::Primitive2DContainer aNewTarget;

            // prepare Target and ViewBox for evtl. AspectRatio mappings

            const double fX(getX().isSet() ? getX().solve(*this, NumberType::xcoordinate) : 0.0);

            const double fY(getY().isSet() ? getY().solve(*this, NumberType::ycoordinate) : 0.0);

            const basegfx::B2DRange aTarget(fX, fY, fX + fWidth, fY + fHeight);

            basegfx::B2DRange aViewBox(aTarget);

            if(!maData.isEmpty())

            {

                // use embedded base64 encoded data

                css::uno::Sequence< sal_Int8 > aPass;

                ::comphelper::Base64::decode(aPass, maData);

                if(aPass.hasElements())

                {

                    SvMemoryStream aStream(aPass.getArray(), aPass.getLength(), StreamMode::READ);

                    Graphic aGraphic;

                    if(ERRCODE_NONE == GraphicFilter::GetGraphicFilter().ImportGraphic(

                        aGraphic,

                        u"",

                        aStream))

                    {

                        extractFromGraphic(aGraphic, aNewTarget, aViewBox, aBitmapEx);

                    }

                }

            }

            else if(!maUrl.isEmpty())

            {

                const OUString& rPath = getDocument().getAbsolutePath();

                OUString aAbsUrl;

                try {

                    aAbsUrl = rtl::Uri::convertRelToAbs(rPath, maUrl);

                } catch (rtl::MalformedUriException & e) {

                    SAL_WARN(

                        "svg",

                        "caught rtl::MalformedUriException \""

                            << e.getMessage() << "\"");

                }

                if (!aAbsUrl.isEmpty() && rPath != aAbsUrl)

                {

                    SvFileStream aStream(aAbsUrl, StreamMode::STD_READ);

                    Graphic aGraphic;

                    if(ERRCODE_NONE == GraphicFilter::GetGraphicFilter().ImportGraphic(

                           aGraphic,

                           aAbsUrl,

                           aStream))

                    {

                        extractFromGraphic(aGraphic, aNewTarget, aViewBox, aBitmapEx);

                    }

                }

            }

            else if(!maXLink.isEmpty())

            {

                const SvgNode* pXLink = getDocument().findSvgNodeById(maXLink);

                if(pXLink && Display::None != pXLink->getDisplay())

                {

                    pXLink->decomposeSvgNode(aNewTarget, true);

                    if(!aNewTarget.empty())

                    {

                        aViewBox = aNewTarget.getB2DRange(drawinglayer::geometry::ViewInformation2D());

                    }

                }

            }

            if(!aBitmapEx.IsEmpty() && 0 != aBitmapEx.GetSizePixel().Width()  && 0 != aBitmapEx.GetSizePixel().Height())

            {

                // calculate centered unit size

                const double fAspectRatio = static_cast<double>(aBitmapEx.GetSizePixel().Width()) / static_cast<double>(aBitmapEx.GetSizePixel().Height());

                if (basegfx::fTools::equalZero(fAspectRatio))

                {

                    // use unit range

                    aViewBox = basegfx::B2DRange(0.0, 0.0, 1.0, 1.0);

                }

                else if (fAspectRatio > 0.0)

                {

                    // width bigger height

                    const double fHalfHeight((1.0 / fAspectRatio) * 0.5);

                    aViewBox = basegfx::B2DRange(

                        0.0,

                        0.5 - fHalfHeight,

                        1.0,

                        0.5 + fHalfHeight);

                }

                else

                {

                    // height bigger width

                    const double fHalfWidth(fAspectRatio * 0.5);

                    aViewBox = basegfx::B2DRange(

                        0.5 - fHalfWidth,

                        0.0,

                        0.5 + fHalfWidth,

                        1.0);

                }

                // create content from created bitmap, use calculated unit range size

                // as transformation to map the picture data correctly

                aNewTarget.resize(1);

                aNewTarget[0] = new drawinglayer::primitive2d::BitmapPrimitive2D(

                    aBitmapEx,

                    basegfx::utils::createScaleTranslateB2DHomMatrix(

                        aViewBox.getRange(),

                        aViewBox.getMinimum()));

            }

            if(aNewTarget.empty())

                return;

            // create mapping

            const SvgAspectRatio& rRatio = maSvgAspectRatio;

            // even when ratio is not set, use the defaults

            // let mapping be created from SvgAspectRatio

            const basegfx::B2DHomMatrix aEmbeddingTransform(rRatio.createMapping(aTarget, aViewBox));

            if(!aEmbeddingTransform.isIdentity())

            {

                const drawinglayer::primitive2d::Primitive2DReference xRef(

                    new drawinglayer::primitive2d::TransformPrimitive2D(

                        aEmbeddingTransform,

                        std::move(aNewTarget)));

                aNewTarget = drawinglayer::primitive2d::Primitive2DContainer { xRef };

            }

            if(!rRatio.isMeetOrSlice())

            {

                // need to embed in MaskPrimitive2D to ensure clipping

                const drawinglayer::primitive2d::Primitive2DReference xMask(

                    new drawinglayer::primitive2d::MaskPrimitive2D(

                        basegfx::B2DPolyPolygon(

                            basegfx::utils::createPolygonFromRect(aTarget)),

                        std::move(aNewTarget)));

                aNewTarget = drawinglayer::primitive2d::Primitive2DContainer { xMask };

            }

            // embed and add to rTarget, take local extra-transform into account

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

        }

} // end of namespace svgio::svgreader

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