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

/*

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 * 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 <drawinglayer/primitive2d/Primitive2DContainer.hxx>

#include <drawinglayer/primitive2d/shadowprimitive2d.hxx>

#include <drawinglayer/primitive2d/unifiedtransparenceprimitive2d.hxx>

#include <basegfx/polygon/b2dpolygontools.hxx>

#include <svgfedropshadownode.hxx>

#include <o3tl/string_view.hxx>

namespace svgio::svgreader

{

SvgFeDropShadowNode::SvgFeDropShadowNode(SvgDocument& rDocument, SvgNode* pParent)

    : SvgFilterNode(SVGToken::FeDropShadow, rDocument, pParent)

    , maDx(0.0)

    , maDy(0.0)

    , maStdDeviation(0.0)

    , maFloodColor(SvgPaint())

    , maFloodOpacity(1.0)

{

}

SvgFeDropShadowNode::~SvgFeDropShadowNode() {}

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

{

    // parse own

    switch (aSVGToken)

    {

        case SVGToken::Style:

        {

            readLocalCssStyle(aContent);

            break;

        }

        case SVGToken::In:

        {

            maIn = aContent.trim();

            break;

        }

        case SVGToken::Result:

        {

            maResult = aContent.trim();

            break;

        }

        case SVGToken::Dx:

        {

            SvgNumber aNum;

            if (readSingleNumber(aContent, aNum))

            {

                maDx = aNum;

            }

            break;

        }

        case SVGToken::Dy:

        {

            SvgNumber aNum;

            if (readSingleNumber(aContent, aNum))

            {

                maDy = aNum;

            }

            break;

        }

        case SVGToken::StdDeviation:

        {

            SvgNumber aNum;

            if (readSingleNumber(aContent, aNum))

            {

                maStdDeviation = aNum;

            }

            break;

        }

        case SVGToken::FloodColor:

        {

            SvgPaint aSvgPaint;

            OUString aURL;

            SvgNumber aOpacity;

            if (readSvgPaint(aContent, aSvgPaint, aURL, aOpacity))

            {

                maFloodColor = aSvgPaint;

            }

            break;

        }

        case SVGToken::FloodOpacity:

        {

            SvgNumber aNum;

            if (readSingleNumber(aContent, aNum))

            {

                maFloodOpacity = SvgNumber(std::clamp(aNum.getNumber(), 0.0, 1.0), aNum.getUnit(),

                                           aNum.isSet());

            }

            break;

        }

        default:

        {

            break;

        }

    }

}

void SvgFeDropShadowNode::apply(drawinglayer::primitive2d::Primitive2DContainer& rTarget,

                                const SvgFilterNode* pParent) const

{

    if (const drawinglayer::primitive2d::Primitive2DContainer* rSource

        = pParent->findGraphicSource(maIn))

    {

        rTarget = *rSource;

    }

    basegfx::B2DHomMatrix aTransform;

    if (maDx.isSet() || maDy.isSet())

    {

        aTransform.translate(maDx.solve(*this, NumberType::xcoordinate),

                             maDy.solve(*this, NumberType::ycoordinate));

    }

    drawinglayer::primitive2d::Primitive2DContainer aTempTarget;

    // Create the shadow

    aTempTarget.append(new drawinglayer::primitive2d::ShadowPrimitive2D(

        aTransform, maFloodColor.getBColor(), maStdDeviation.getNumber(),

        drawinglayer::primitive2d::Primitive2DContainer(rTarget)));

    const double fOpacity(maFloodOpacity.solve(*this));

    if (basegfx::fTools::less(fOpacity, 1.0))

    {

        // Apply transparence to the shadow

        aTempTarget.append(new drawinglayer::primitive2d::UnifiedTransparencePrimitive2D(

            std::move(aTempTarget), 1.0 - fOpacity));

    }

    // Append the original target

    aTempTarget.append(rTarget);

    rTarget = std::move(aTempTarget);

    pParent->addGraphicSourceToMapper(maResult, rTarget);

}

} // end of namespace svgio::svgreader

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