/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#include "mozilla/dom/SVGRectElement.h"
#include "nsGkAtoms.h"
#include "gfxContext.h"
#include "mozilla/dom/SVGRectElementBinding.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PathHelpers.h"
#include <algorithm>

NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(Rect)

using namespace mozilla::gfx;

namespace mozilla {
namespace dom {

class SVGAnimatedLength;

JSObject*
SVGRectElement::WrapNode(JSContext *aCx)
{
  return SVGRectElementBinding::Wrap(aCx, this);
}

nsSVGElement::LengthInfo SVGRectElement::sLengthInfo[6] =
{
  { &nsGkAtoms::x, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  { &nsGkAtoms::y, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
  { &nsGkAtoms::width, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  { &nsGkAtoms::height, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y },
  { &nsGkAtoms::rx, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::X },
  { &nsGkAtoms::ry, 0, nsIDOMSVGLength::SVG_LENGTHTYPE_NUMBER, SVGContentUtils::Y }
};

//----------------------------------------------------------------------
// Implementation

SVGRectElement::SVGRectElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
  : SVGRectElementBase(aNodeInfo)
{
}

//----------------------------------------------------------------------
// nsIDOMNode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGRectElement)

//----------------------------------------------------------------------

already_AddRefed<SVGAnimatedLength>
SVGRectElement::X()
{
  return mLengthAttributes[ATTR_X].ToDOMAnimatedLength(this);
}

already_AddRefed<SVGAnimatedLength>
SVGRectElement::Y()
{
  return mLengthAttributes[ATTR_Y].ToDOMAnimatedLength(this);
}

already_AddRefed<SVGAnimatedLength>
SVGRectElement::Width()
{
  return mLengthAttributes[ATTR_WIDTH].ToDOMAnimatedLength(this);
}

already_AddRefed<SVGAnimatedLength>
SVGRectElement::Height()
{
  return mLengthAttributes[ATTR_HEIGHT].ToDOMAnimatedLength(this);
}

already_AddRefed<SVGAnimatedLength>
SVGRectElement::Rx()
{
  return mLengthAttributes[ATTR_RX].ToDOMAnimatedLength(this);
}

already_AddRefed<SVGAnimatedLength>
SVGRectElement::Ry()
{
  return mLengthAttributes[ATTR_RY].ToDOMAnimatedLength(this);
}

//----------------------------------------------------------------------
// nsSVGElement methods

/* virtual */ bool
SVGRectElement::HasValidDimensions() const
{
  return mLengthAttributes[ATTR_WIDTH].IsExplicitlySet() &&
         mLengthAttributes[ATTR_WIDTH].GetAnimValInSpecifiedUnits() > 0 &&
         mLengthAttributes[ATTR_HEIGHT].IsExplicitlySet() &&
         mLengthAttributes[ATTR_HEIGHT].GetAnimValInSpecifiedUnits() > 0;
}

nsSVGElement::LengthAttributesInfo
SVGRectElement::GetLengthInfo()
{
  return LengthAttributesInfo(mLengthAttributes, sLengthInfo,
                              ArrayLength(sLengthInfo));
}

//----------------------------------------------------------------------
// nsSVGPathGeometryElement methods

void
SVGRectElement::ConstructPath(gfxContext *aCtx)
{
  float x, y, width, height, rx, ry;

  GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);

  /* In a perfect world, this would be handled by the DOM, and
     return a DOM exception. */
  if (width <= 0 || height <= 0)
    return;

  rx = std::max(rx, 0.0f);
  ry = std::max(ry, 0.0f);

  /* optimize the no rounded corners case */
  if (rx == 0 && ry == 0) {
    aCtx->Rectangle(gfxRect(x, y, width, height));
    return;
  }

  /* If either the 'rx' or the 'ry' attribute isn't set, then we
     have to set it to the value of the other. */
  bool hasRx = mLengthAttributes[ATTR_RX].IsExplicitlySet();
  bool hasRy = mLengthAttributes[ATTR_RY].IsExplicitlySet();
  if (hasRx && !hasRy)
    ry = rx;
  else if (hasRy && !hasRx)
    rx = ry;

  /* Clamp rx and ry to half the rect's width and height respectively. */
  float halfWidth  = width/2;
  float halfHeight = height/2;
  if (rx > halfWidth)
    rx = halfWidth;
  if (ry > halfHeight)
    ry = halfHeight;

  gfxSize corner(rx, ry);
  aCtx->RoundedRectangle(gfxRect(x, y, width, height),
                         gfxCornerSizes(corner, corner, corner, corner));
}

TemporaryRef<Path>
SVGRectElement::BuildPath(PathBuilder* aBuilder)
{
  float x, y, width, height, rx, ry;
  GetAnimatedLengthValues(&x, &y, &width, &height, &rx, &ry, nullptr);

  if (width <= 0 || height <= 0) {
    return nullptr;
  }

  RefPtr<PathBuilder> pathBuilder = aBuilder ? aBuilder : CreatePathBuilder();

  rx = std::max(rx, 0.0f);
  ry = std::max(ry, 0.0f);

  if (rx == 0 && ry == 0) {
    // Optimization for the no rounded corners case.
    Rect r(x, y, width, height);
    pathBuilder->MoveTo(r.TopLeft());
    pathBuilder->LineTo(r.TopRight());
    pathBuilder->LineTo(r.BottomRight());
    pathBuilder->LineTo(r.BottomLeft());
    pathBuilder->Close();
  } else {
    // If either the 'rx' or the 'ry' attribute isn't set, then we have to
    // set it to the value of the other:
    bool hasRx = mLengthAttributes[ATTR_RX].IsExplicitlySet();
    bool hasRy = mLengthAttributes[ATTR_RY].IsExplicitlySet();
    MOZ_ASSERT(hasRx || hasRy);

    if (hasRx && !hasRy) {
      ry = rx;
    } else if (hasRy && !hasRx) {
      rx = ry;
    }

    // Clamp rx and ry to half the rect's width and height respectively:
    rx = std::min(rx, width / 2);
    ry = std::min(ry, height / 2);

    Size cornerRadii(rx, ry);
    Size radii[] = { cornerRadii, cornerRadii, cornerRadii, cornerRadii };
    AppendRoundedRectToPath(pathBuilder, Rect(x, y, width, height), radii);
  }

  return pathBuilder->Finish();
}

} // namespace dom
} // namespace mozilla
