/*
    Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
                  2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>

    This file is part of the KDE project

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "wtf/Platform.h"

#if ENABLE(SVG)
#include "SVGGradientElement.h"

#include "css/cssstyleselector.h"
#include "RenderPath.h"
#include "RenderSVGHiddenContainer.h"
#include "SVGNames.h"
#include "SVGPaintServerLinearGradient.h"
#include "SVGPaintServerRadialGradient.h"
#include "SVGStopElement.h"
#include "SVGTransformList.h"
#include "SVGTransformable.h"
#include "SVGUnitTypes.h"

namespace WebCore
{

SVGGradientElement::SVGGradientElement(const QualifiedName &tagName, Document *doc)
    : SVGStyledElement(tagName, doc)
    , SVGURIReference()
    , SVGExternalResourcesRequired()
    , m_spreadMethod(0)
    , m_gradientUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
    , m_gradientTransform(SVGTransformList::create(SVGNames::gradientTransformAttr))
{
}

SVGGradientElement::~SVGGradientElement()
{
}

ANIMATED_PROPERTY_DEFINITIONS(SVGGradientElement, int, Enumeration, enumeration, GradientUnits, gradientUnits, SVGNames::gradientUnitsAttr, m_gradientUnits)
ANIMATED_PROPERTY_DEFINITIONS(SVGGradientElement, SVGTransformList *, TransformList, transformList, GradientTransform, gradientTransform, SVGNames::gradientTransformAttr, m_gradientTransform.get())
ANIMATED_PROPERTY_DEFINITIONS(SVGGradientElement, int, Enumeration, enumeration, SpreadMethod, spreadMethod, SVGNames::spreadMethodAttr, m_spreadMethod)

void SVGGradientElement::parseMappedAttribute(MappedAttribute *attr)
{
    if (attr->name() == SVGNames::gradientUnitsAttr) {
        if (attr->value() == "userSpaceOnUse") {
            setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        } else if (attr->value() == "objectBoundingBox") {
            setGradientUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
        }
    } else if (attr->name() == SVGNames::gradientTransformAttr) {
        SVGTransformList *gradientTransforms = gradientTransformBaseValue();
        if (!SVGTransformable::parseTransformAttribute(gradientTransforms, attr->value())) {
            ExceptionCode ec = 0;
            gradientTransforms->clear(ec);
        }
    } else if (attr->name() == SVGNames::spreadMethodAttr) {
        if (attr->value() == "reflect") {
            setSpreadMethodBaseValue(SVG_SPREADMETHOD_REFLECT);
        } else if (attr->value() == "repeat") {
            setSpreadMethodBaseValue(SVG_SPREADMETHOD_REPEAT);
        } else if (attr->value() == "pad") {
            setSpreadMethodBaseValue(SVG_SPREADMETHOD_PAD);
        }
    } else {
        if (SVGURIReference::parseMappedAttribute(attr)) {
            return;
        }
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr)) {
            return;
        }

        SVGStyledElement::parseMappedAttribute(attr);
    }
}

void SVGGradientElement::svgAttributeChanged(const QualifiedName &attrName)
{
    SVGStyledElement::svgAttributeChanged(attrName);

    if (!m_resource) {
        return;
    }

    if (attrName == SVGNames::gradientUnitsAttr ||
            attrName == SVGNames::gradientTransformAttr ||
            attrName == SVGNames::spreadMethodAttr ||
            SVGURIReference::isKnownAttribute(attrName) ||
            SVGExternalResourcesRequired::isKnownAttribute(attrName) ||
            SVGStyledElement::isKnownAttribute(attrName)) {
        m_resource->invalidate();
    }
}

void SVGGradientElement::childrenChanged(bool changedByParser, Node *beforeChange, Node *afterChange, int childCountDelta)
{
    SVGStyledElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);

    if (m_resource) {
        m_resource->invalidate();
    }
}

RenderObject *SVGGradientElement::createRenderer(RenderArena *arena, RenderStyle *)
{
    return new(arena) RenderSVGHiddenContainer(this);
}

SVGResource *SVGGradientElement::canvasResource()
{
    // qDebug() << "request gradient paint server" << endl;
    if (!m_resource) {
        if (gradientType() == LinearGradientPaintServer) {
            m_resource = SVGPaintServerLinearGradient::create(this);
        } else {
            m_resource = SVGPaintServerRadialGradient::create(this);
        }
    }

    return m_resource.get();
}

Vector<SVGGradientStop> SVGGradientElement::buildStops() const
{
    Vector<SVGGradientStop> stops;

    for (Node *n = firstChild(); n; n = n->nextSibling()) {
        SVGElement *element = n->isSVGElement() ? static_cast<SVGElement *>(n) : 0;

        if (element && element->isGradientStop()) {
            SVGStopElement *stop = static_cast<SVGStopElement *>(element);
            float stopOffset = stop->offset();

            RenderStyle *stopStyle = stop->computedStyle();
            QColor color   = stopStyle->svgStyle()->stopColor();
            float  opacity = stopStyle->svgStyle()->stopOpacity();

            stops.append(makeGradientStop(stopOffset, QColor(color.red(), color.green(), color.blue(), int(opacity * 255.))));
        }
    }

    return stops;
}

}

#endif // ENABLE(SVG)
