/*
    Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
                  2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
    Copyright (C) Research In Motion Limited 2010. All rights reserved.

    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 "config.h"

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

#include "AffineTransform.h"
#include "Attribute.h"
#include "Document.h"
#include "FloatConversion.h"
#include "GraphicsContext.h"
#include "ImageBuffer.h"
#include "PatternAttributes.h"
#include "RenderSVGContainer.h"
#include "RenderSVGResourcePattern.h"
#include "SVGLength.h"
#include "SVGNames.h"
#include "SVGRenderSupport.h"
#include "SVGSVGElement.h"
#include "SVGStyledTransformableElement.h"
#include "SVGTransformList.h"
#include "SVGTransformable.h"
#include "SVGUnitTypes.h"
#include <math.h>
#include <wtf/MathExtras.h>
#include <wtf/OwnPtr.h>

using namespace std;

namespace WebCore {

SVGPatternElement::SVGPatternElement(const QualifiedName& tagName, Document* doc)
    : SVGStyledElement(tagName, doc)
    , SVGURIReference()
    , SVGTests()
    , SVGLangSpace()
    , SVGExternalResourcesRequired()
    , SVGFitToViewBox()
    , m_x(LengthModeWidth)
    , m_y(LengthModeHeight)
    , m_width(LengthModeWidth)
    , m_height(LengthModeHeight)
    , m_patternUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
    , m_patternContentUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
    , m_patternTransform(SVGTransformList::create(SVGNames::patternTransformAttr))
{
}

SVGPatternElement::~SVGPatternElement()
{
}

void SVGPatternElement::parseMappedAttribute(Attribute* attr)
{
    if (attr->name() == SVGNames::patternUnitsAttr) {
        if (attr->value() == "userSpaceOnUse")
            setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        else if (attr->value() == "objectBoundingBox")
            setPatternUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
    } else if (attr->name() == SVGNames::patternContentUnitsAttr) {
        if (attr->value() == "userSpaceOnUse")
            setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        else if (attr->value() == "objectBoundingBox")
            setPatternContentUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
    } else if (attr->name() == SVGNames::patternTransformAttr) {
        SVGTransformList* patternTransforms = patternTransformBaseValue();
        if (!SVGTransformable::parseTransformAttribute(patternTransforms, attr->value())) {
            ExceptionCode ec = 0;
            patternTransforms->clear(ec);
        }
    } else if (attr->name() == SVGNames::xAttr)
        setXBaseValue(SVGLength(LengthModeWidth, attr->value()));
    else if (attr->name() == SVGNames::yAttr)
        setYBaseValue(SVGLength(LengthModeHeight, attr->value()));
    else if (attr->name() == SVGNames::widthAttr) {
        setWidthBaseValue(SVGLength(LengthModeWidth, attr->value()));
        if (widthBaseValue().value(this) < 0.0)
            document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <width> is not allowed");
    } else if (attr->name() == SVGNames::heightAttr) {
        setHeightBaseValue(SVGLength(LengthModeHeight, attr->value()));
        if (heightBaseValue().value(this) < 0.0)
            document()->accessSVGExtensions()->reportError("A negative value for pattern attribute <height> is not allowed");
    } else {
        if (SVGURIReference::parseMappedAttribute(attr))
            return;
        if (SVGTests::parseMappedAttribute(attr))
            return;
        if (SVGLangSpace::parseMappedAttribute(attr))
            return;
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
            return;
        if (SVGFitToViewBox::parseMappedAttribute(document(), attr))
            return;

        SVGStyledElement::parseMappedAttribute(attr);
    }
}

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

    bool invalidateClients = false;
    if (attrName == SVGNames::xAttr
        || attrName == SVGNames::yAttr
        || attrName == SVGNames::widthAttr
        || attrName == SVGNames::heightAttr) {
        invalidateClients = true;
        updateRelativeLengthsInformation();
    }

    if (invalidateClients
        || attrName == SVGNames::patternUnitsAttr
        || attrName == SVGNames::patternContentUnitsAttr
        || attrName == SVGNames::patternTransformAttr
        || SVGURIReference::isKnownAttribute(attrName)
        || SVGTests::isKnownAttribute(attrName)
        || SVGLangSpace::isKnownAttribute(attrName)
        || SVGExternalResourcesRequired::isKnownAttribute(attrName)
        || SVGFitToViewBox::isKnownAttribute(attrName)
        || SVGStyledElement::isKnownAttribute(attrName))
        invalidateResourceClients();
}

void SVGPatternElement::synchronizeProperty(const QualifiedName& attrName)
{
    SVGStyledElement::synchronizeProperty(attrName);

    if (attrName == anyQName()) {
        synchronizePatternUnits();
        synchronizePatternContentUnits();
        synchronizePatternTransform();
        synchronizeX();
        synchronizeY();
        synchronizeWidth();
        synchronizeHeight();
        synchronizeExternalResourcesRequired();
        synchronizeViewBox();
        synchronizePreserveAspectRatio();
        synchronizeHref();
        return;
    }

    if (attrName == SVGNames::patternUnitsAttr)
        synchronizePatternUnits();
    else if (attrName == SVGNames::patternContentUnitsAttr)
        synchronizePatternContentUnits();
    else if (attrName == SVGNames::patternTransformAttr)
        synchronizePatternTransform();
    else if (attrName == SVGNames::xAttr)
        synchronizeX();
    else if (attrName == SVGNames::yAttr)
        synchronizeY();
    else if (attrName == SVGNames::widthAttr)
        synchronizeWidth();
    else if (attrName == SVGNames::heightAttr)
        synchronizeHeight();
    else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
        synchronizeExternalResourcesRequired();
    else if (SVGFitToViewBox::isKnownAttribute(attrName)) {
        synchronizeViewBox();
        synchronizePreserveAspectRatio();
    } else if (SVGURIReference::isKnownAttribute(attrName))
        synchronizeHref();
}

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

    if (!changedByParser)
        invalidateResourceClients();
}

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

PatternAttributes SVGPatternElement::collectPatternProperties() const
{
    PatternAttributes attributes;
    HashSet<const SVGPatternElement*> processedPatterns;

    const SVGPatternElement* current = this;
    while (current) {
        if (!attributes.hasX() && current->hasAttribute(SVGNames::xAttr))
            attributes.setX(current->x());

        if (!attributes.hasY() && current->hasAttribute(SVGNames::yAttr))
            attributes.setY(current->y());

        if (!attributes.hasWidth() && current->hasAttribute(SVGNames::widthAttr))
            attributes.setWidth(current->width());

        if (!attributes.hasHeight() && current->hasAttribute(SVGNames::heightAttr))
            attributes.setHeight(current->height());

        if (!attributes.hasBoundingBoxMode() && current->hasAttribute(SVGNames::patternUnitsAttr))
            attributes.setBoundingBoxMode(current->patternUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);

        if (!attributes.hasBoundingBoxModeContent() && current->hasAttribute(SVGNames::patternContentUnitsAttr))
            attributes.setBoundingBoxModeContent(current->patternContentUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);

        if (!attributes.hasPatternTransform() && current->hasAttribute(SVGNames::patternTransformAttr))
            attributes.setPatternTransform(current->patternTransform()->consolidate().matrix());

        if (!attributes.hasPatternContentElement() && current->hasChildNodes())
            attributes.setPatternContentElement(current);

        processedPatterns.add(current);

        // Respect xlink:href, take attributes from referenced element
        Node* refNode = ownerDocument()->getElementById(SVGURIReference::getTarget(current->href()));
        if (refNode && refNode->hasTagName(SVGNames::patternTag)) {
            current = static_cast<const SVGPatternElement*>(const_cast<const Node*>(refNode));

            // Cycle detection
            if (processedPatterns.contains(current))
                return PatternAttributes();
        } else
            current = 0;
    }

    return attributes;
}

bool SVGPatternElement::selfHasRelativeLengths() const
{
    return x().isRelative()
        || y().isRelative()
        || width().isRelative()
        || height().isRelative();
}

}

#endif // ENABLE(SVG)
