/* -*- 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 "nsScriptableRegion.h"
#include <stdint.h>              // for uint32_t
#include <sys/types.h>           // for int32_t
#include "js/RootingAPI.h"       // for Rooted
#include "js/Value.h"            // for INT_TO_JSVAL, etc
#include "jsapi.h"               // for JS_DefineElement, etc
#include "mozilla/Assertions.h"  // for MOZ_ASSERT_HELPER2
#include "nsError.h"             // for NS_OK, NS_ERROR_FAILURE, etc
#include "nsID.h"
#include "nsRect.h"  // for mozilla::gfx::IntRect
#include "nscore.h"  // for NS_IMETHODIMP

class JSObject;
struct JSContext;

nsScriptableRegion::nsScriptableRegion() {}

NS_IMPL_ISUPPORTS(nsScriptableRegion, nsIScriptableRegion)

NS_IMETHODIMP nsScriptableRegion::Init() { return NS_OK; }

NS_IMETHODIMP nsScriptableRegion::SetToRegion(nsIScriptableRegion *aRegion) {
  aRegion->GetRegion(&mRegion);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::SetToRect(int32_t aX, int32_t aY,
                                            int32_t aWidth, int32_t aHeight) {
  mRegion = mozilla::gfx::IntRect(aX, aY, aWidth, aHeight);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::IntersectRegion(
    nsIScriptableRegion *aRegion) {
  nsIntRegion region;
  aRegion->GetRegion(&region);
  mRegion.And(mRegion, region);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::IntersectRect(int32_t aX, int32_t aY,
                                                int32_t aWidth,
                                                int32_t aHeight) {
  mRegion.And(mRegion, mozilla::gfx::IntRect(aX, aY, aWidth, aHeight));
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::UnionRegion(nsIScriptableRegion *aRegion) {
  nsIntRegion region;
  aRegion->GetRegion(&region);
  mRegion.Or(mRegion, region);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::UnionRect(int32_t aX, int32_t aY,
                                            int32_t aWidth, int32_t aHeight) {
  mRegion.Or(mRegion, mozilla::gfx::IntRect(aX, aY, aWidth, aHeight));
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::SubtractRegion(nsIScriptableRegion *aRegion) {
  nsIntRegion region;
  aRegion->GetRegion(&region);
  mRegion.Sub(mRegion, region);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::SubtractRect(int32_t aX, int32_t aY,
                                               int32_t aWidth,
                                               int32_t aHeight) {
  mRegion.Sub(mRegion, mozilla::gfx::IntRect(aX, aY, aWidth, aHeight));
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::IsEmpty(bool *isEmpty) {
  *isEmpty = mRegion.IsEmpty();
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::IsEqualRegion(nsIScriptableRegion *aRegion,
                                                bool *isEqual) {
  nsIntRegion region;
  aRegion->GetRegion(&region);
  *isEqual = mRegion.IsEqual(region);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::GetBoundingBox(int32_t *aX, int32_t *aY,
                                                 int32_t *aWidth,
                                                 int32_t *aHeight) {
  mozilla::gfx::IntRect boundRect = mRegion.GetBounds();
  boundRect.GetRect(aX, aY, aWidth, aHeight);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::Offset(int32_t aXOffset, int32_t aYOffset) {
  mRegion.MoveBy(aXOffset, aYOffset);
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::ContainsRect(int32_t aX, int32_t aY,
                                               int32_t aWidth, int32_t aHeight,
                                               bool *containsRect) {
  *containsRect =
      mRegion.Contains(mozilla::gfx::IntRect(aX, aY, aWidth, aHeight));
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::GetRegion(nsIntRegion *outRgn) {
  *outRgn = mRegion;
  return NS_OK;
}

NS_IMETHODIMP nsScriptableRegion::GetRects(
    JSContext *aCx, JS::MutableHandle<JS::Value> aRects) {
  uint32_t numRects = mRegion.GetNumRects();

  if (!numRects) {
    aRects.setNull();
    return NS_OK;
  }

  JS::Rooted<JSObject *> destArray(aCx, JS_NewArrayObject(aCx, numRects * 4));
  if (!destArray) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  aRects.setObject(*destArray);

  uint32_t n = 0;
  for (auto iter = mRegion.RectIter(); !iter.Done(); iter.Next()) {
    const mozilla::gfx::IntRect &rect = iter.Get();
    if (!JS_DefineElement(aCx, destArray, n, rect.X(), JSPROP_ENUMERATE) ||
        !JS_DefineElement(aCx, destArray, n + 1, rect.Y(), JSPROP_ENUMERATE) ||
        !JS_DefineElement(aCx, destArray, n + 2, rect.Width(),
                          JSPROP_ENUMERATE) ||
        !JS_DefineElement(aCx, destArray, n + 3, rect.Height(),
                          JSPROP_ENUMERATE)) {
      return NS_ERROR_FAILURE;
    }
    n += 4;
  }

  return NS_OK;
}