/* 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/SVGPolygonElement.h"

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

using namespace mozilla::gfx;

NS_IMPL_NS_NEW_SVG_ELEMENT(Polygon)

namespace mozilla::dom {

JSObject* SVGPolygonElement::WrapNode(JSContext* aCx,
                                      JS::Handle<JSObject*> aGivenProto) {
  return SVGPolygonElement_Binding::Wrap(aCx, this, aGivenProto);
}

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

SVGPolygonElement::SVGPolygonElement(
    already_AddRefed<mozilla::dom::NodeInfo> aNodeInfo)
    : SVGPolygonElementBase(std::move(aNodeInfo)) {}

//----------------------------------------------------------------------
// nsINode methods

NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGPolygonElement)

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

void SVGPolygonElement::GetMarkPoints(nsTArray<SVGMark>* aMarks) {
  SVGPolyElement::GetMarkPoints(aMarks);

  if (aMarks->IsEmpty() || aMarks->LastElement().type != SVGMark::Type::End) {
    return;
  }

  SVGMark* endMark = &aMarks->LastElement();
  SVGMark* startMark = &aMarks->ElementAt(0);
  float angle = std::atan2(startMark->pos.y - endMark->pos.y,
                           startMark->pos.x - endMark->pos.x);

  endMark->type = SVGMark::Type::Mid;
  endMark->angle = SVGContentUtils::AngleBisect(angle, endMark->angle);
  startMark->angle = SVGContentUtils::AngleBisect(angle, startMark->angle);
  // for a polygon (as opposed to a polyline) there's an implicit extra point
  // co-located with the start point that SVGPolyElement::GetMarkPoints
  // doesn't return
  aMarks->AppendElement(
      SVGMark(startMark->pos, startMark->angle, SVGMark::Type::End));
}

already_AddRefed<Path> SVGPolygonElement::BuildPath(PathBuilder* aBuilder) {
  const SVGPointList& points = mPoints.GetAnimValue();

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

  float zoom = UserSpaceMetrics::GetZoom(this);

  Point zoomedPoint = Point(points[0]) * zoom;
  if (!zoomedPoint.IsFinite()) {
    return nullptr;
  }
  aBuilder->MoveTo(zoomedPoint);
  for (uint32_t i = 1; i < points.Length(); ++i) {
    zoomedPoint = Point(points[i]) * zoom;
    if (!zoomedPoint.IsFinite()) {
      return nullptr;
    }
    aBuilder->LineTo(zoomedPoint);
  }

  aBuilder->Close();

  return aBuilder->Finish();
}

}  // namespace mozilla::dom