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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/WebKitCSSMatrix.h"

#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/WebKitCSSMatrixBinding.h"
#include "mozilla/Preferences.h"
#include "nsPresContext.h"
#include "RuleNodeCacheConditions.h"
#include "nsGlobalWindowInner.h"

namespace mozilla {
namespace dom {

static const double sRadPerDegree = 2.0 * M_PI / 360.0;

static bool IsStyledByServo(JSContext* aContext) {
  nsGlobalWindowInner* win = xpc::CurrentWindowOrNull(aContext);
  nsIDocument* doc = win ? win->GetDoc() : nullptr;
  return doc ? doc->IsStyledByServo() : false;
}

bool WebKitCSSMatrix::FeatureEnabled(JSContext* aCx, JSObject* aObj) {
  return Preferences::GetBool("layout.css.DOMMatrix.enabled", false) &&
         Preferences::GetBool("layout.css.prefixes.webkit", false);
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Constructor(
    const GlobalObject& aGlobal, ErrorResult& aRv) {
  RefPtr<WebKitCSSMatrix> obj = new WebKitCSSMatrix(
      aGlobal.GetAsSupports(), IsStyledByServo(aGlobal.Context()));
  return obj.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Constructor(
    const GlobalObject& aGlobal, const nsAString& aTransformList,
    ErrorResult& aRv) {
  RefPtr<WebKitCSSMatrix> obj = new WebKitCSSMatrix(
      aGlobal.GetAsSupports(), IsStyledByServo(aGlobal.Context()));
  obj = obj->SetMatrixValue(aTransformList, aRv);
  return obj.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Constructor(
    const GlobalObject& aGlobal, const DOMMatrixReadOnly& aOther,
    ErrorResult& aRv) {
  RefPtr<WebKitCSSMatrix> obj =
      new WebKitCSSMatrix(aGlobal.GetAsSupports(), aOther);
  return obj.forget();
}

JSObject* WebKitCSSMatrix::WrapObject(JSContext* aCx,
                                      JS::Handle<JSObject*> aGivenProto) {
  return WebKitCSSMatrixBinding::Wrap(aCx, this, aGivenProto);
}

WebKitCSSMatrix* WebKitCSSMatrix::SetMatrixValue(
    const nsAString& aTransformList, ErrorResult& aRv) {
  DOMMatrix::SetMatrixValue(aTransformList, aRv);
  return this;
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Multiply(
    const WebKitCSSMatrix& other) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->MultiplySelf(other);

  return retval.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Inverse(
    ErrorResult& aRv) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->InvertSelfThrow(aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  return retval.forget();
}

WebKitCSSMatrix* WebKitCSSMatrix::InvertSelfThrow(ErrorResult& aRv) {
  if (mMatrix3D) {
    if (!mMatrix3D->Invert()) {
      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
      return nullptr;
    }
  } else if (!mMatrix2D->Invert()) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return nullptr;
  }

  return this;
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Translate(double aTx,
                                                             double aTy,
                                                             double aTz) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->TranslateSelf(aTx, aTy, aTz);

  return retval.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Scale(
    double aScaleX, const Optional<double>& aScaleY, double aScaleZ) const {
  double scaleX = aScaleX;
  double scaleY = aScaleY.WasPassed() ? aScaleY.Value() : scaleX;
  double scaleZ = aScaleZ;

  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->ScaleNonUniformSelf(scaleX, scaleY, scaleZ);

  return retval.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::Rotate(
    double aRotX, const Optional<double>& aRotY,
    const Optional<double>& aRotZ) const {
  double rotX = aRotX;
  double rotY;
  double rotZ;

  if (!aRotY.WasPassed() && !aRotZ.WasPassed()) {
    rotZ = rotX;
    rotX = 0;
    rotY = 0;
  } else {
    rotY = aRotY.WasPassed() ? aRotY.Value() : 0;
    rotZ = aRotZ.WasPassed() ? aRotZ.Value() : 0;
  }

  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->Rotate3dSelf(rotX, rotY, rotZ);

  return retval.forget();
}

WebKitCSSMatrix* WebKitCSSMatrix::Rotate3dSelf(double aRotX, double aRotY,
                                               double aRotZ) {
  if (aRotX != 0 || aRotY != 0) {
    Ensure3DMatrix();
  }

  if (mMatrix3D) {
    if (fmod(aRotZ, 360) != 0) {
      mMatrix3D->RotateZ(aRotZ * sRadPerDegree);
    }
    if (fmod(aRotY, 360) != 0) {
      mMatrix3D->RotateY(aRotY * sRadPerDegree);
    }
    if (fmod(aRotX, 360) != 0) {
      mMatrix3D->RotateX(aRotX * sRadPerDegree);
    }
  } else if (fmod(aRotZ, 360) != 0) {
    mMatrix2D->PreRotate(aRotZ * sRadPerDegree);
  }

  return this;
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::RotateAxisAngle(
    double aX, double aY, double aZ, double aAngle) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->RotateAxisAngleSelf(aX, aY, aZ, aAngle);

  return retval.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::SkewX(double aSx) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->SkewXSelf(aSx);

  return retval.forget();
}

already_AddRefed<WebKitCSSMatrix> WebKitCSSMatrix::SkewY(double aSy) const {
  RefPtr<WebKitCSSMatrix> retval = new WebKitCSSMatrix(mParent, *this);
  retval->SkewYSelf(aSy);

  return retval.forget();
}

}  // namespace dom
}  // namespace mozilla