/* 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 "SVGPolyElement.h"

#include "DOMSVGPointList.h"
#include "SVGContentUtils.h"
#include "mozilla/dom/SVGAnimatedLength.h"
#include "mozilla/gfx/2D.h"

using namespace mozilla::gfx;

namespace mozilla::dom {

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

SVGPolyElement::SVGPolyElement(
    already_AddRefed<mozilla::dom::NodeInfo> aNodeInfo)
    : SVGPolyElementBase(std::move(aNodeInfo)) {}

already_AddRefed<DOMSVGPointList> SVGPolyElement::Points() {
  return DOMSVGPointList::GetDOMWrapper(mPoints.GetBaseValKey(), this);
}

already_AddRefed<DOMSVGPointList> SVGPolyElement::AnimatedPoints() {
  return DOMSVGPointList::GetDOMWrapper(mPoints.GetAnimValKey(), this);
}

//----------------------------------------------------------------------
// SVGElement methods

/* virtual */
bool SVGPolyElement::HasValidDimensions() const {
  return !mPoints.GetAnimValue().IsEmpty();
}

//----------------------------------------------------------------------
// SVGGeometryElement methods

bool SVGPolyElement::AttributeDefinesGeometry(const nsAtom* aName) {
  return aName == nsGkAtoms::points || aName == nsGkAtoms::pathLength;
}

void SVGPolyElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  const SVGPointList& points = mPoints.GetAnimValue();

  if (points.IsEmpty()) {
    return;
  }

  float zoom = UserSpaceMetrics::GetZoom(this);

  Point prevPos = points[0] * zoom;
  float prevAngle = 0.0f;
  if (!prevPos.IsFinite()) {
    return;
  }

  aMarks->AppendElement(SVGMark(prevPos, 0, SVGMark::Type::Start));

  for (uint32_t i = 1; i < points.Length(); ++i) {
    gfx::Point pos = points[i] * zoom;
    if (!pos.IsFinite()) {
      aMarks->Clear();
      return;
    }
    float angle = std::atan2(pos.y - prevPos.y, pos.x - prevPos.x);

    // Vertex marker.
    if (i == 1) {
      aMarks->ElementAt(0).angle = angle;
    } else {
      aMarks->LastElement().angle =
          SVGContentUtils::AngleBisect(prevAngle, angle);
    }

    aMarks->AppendElement(SVGMark(pos, 0, SVGMark::Type::Mid));

    prevAngle = angle;
    prevPos = pos;
  }

  aMarks->LastElement().angle = prevAngle;
  aMarks->LastElement().type = SVGMark::Type::End;
}

bool SVGPolyElement::GetGeometryBounds(Rect* aBounds,
                                       const StrokeOptions& aStrokeOptions,
                                       const Matrix& aToBoundsSpace,
                                       const Matrix* aToNonScalingStrokeSpace) {
  const SVGPointList& points = mPoints.GetAnimValue();

  if (points.IsEmpty()) {
    // Rendering of the element is disabled
    aBounds->SetEmpty();
    return true;
  }

  if (aStrokeOptions.mLineWidth > 0 || aToNonScalingStrokeSpace) {
    // We don't handle non-scaling-stroke or stroke-miterlimit etc. yet
    return false;
  }

  float zoom = UserSpaceMetrics::GetZoom(this);

  if (aToBoundsSpace.IsRectilinear()) {
    // We can avoid transforming each point and just transform the result.
    // Important for large point lists.

    Rect bounds(Point(points[0]) * zoom, Size());
    for (uint32_t i = 1; i < points.Length(); ++i) {
      bounds.ExpandToEnclose(Point(points[i]) * zoom);
    }
    *aBounds = aToBoundsSpace.TransformBounds(bounds);
  } else {
    *aBounds =
        Rect(aToBoundsSpace.TransformPoint(Point(points[0]) * zoom), Size());
    for (uint32_t i = 1; i < points.Length(); ++i) {
      aBounds->ExpandToEnclose(
          aToBoundsSpace.TransformPoint(Point(points[i]) * zoom));
    }
  }
  return aBounds->IsFinite();
}
}  // namespace mozilla::dom