/* 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 "EmbeddedObjCollector.h"

#include "Accessible.h"

using namespace mozilla::a11y;

uint32_t EmbeddedObjCollector::Count() {

  EnsureNGetIndex(nullptr);

  return mObjects.Length();

}

Accessible* EmbeddedObjCollector::GetAccessibleAt(uint32_t aIndex) {

  Accessible* accessible = mObjects.SafeElementAt(aIndex, nullptr);

  if (accessible) return accessible;

  return EnsureNGetObject(aIndex);

}

Accessible* EmbeddedObjCollector::EnsureNGetObject(uint32_t aIndex) {

  uint32_t childCount = mRoot->ChildCount();

  while (mRootChildIdx < childCount) {

    Accessible* child = mRoot->GetChildAt(mRootChildIdx++);

    if (child->IsText()) continue;

    AppendObject(child);

    if (mObjects.Length() - 1 == aIndex) return mObjects[aIndex];

  }

  return nullptr;

}

int32_t EmbeddedObjCollector::EnsureNGetIndex(Accessible* aAccessible) {

  uint32_t childCount = mRoot->ChildCount();

  while (mRootChildIdx < childCount) {

    Accessible* child = mRoot->GetChildAt(mRootChildIdx++);

    if (child->IsText()) continue;

    AppendObject(child);

    if (child == aAccessible) return mObjects.Length() - 1;

  }

  return -1;

}

int32_t EmbeddedObjCollector::GetIndexAt(Accessible* aAccessible) {

  if (aAccessible->mParent != mRoot) return -1;

  MOZ_ASSERT(!aAccessible->IsProxy());

  if (aAccessible->mInt.mIndexOfEmbeddedChild != -1)

    return aAccessible->mInt.mIndexOfEmbeddedChild;

  return !aAccessible->IsText() ? EnsureNGetIndex(aAccessible) : -1;

}

void EmbeddedObjCollector::AppendObject(Accessible* aAccessible) {

  MOZ_ASSERT(!aAccessible->IsProxy());

  aAccessible->mInt.mIndexOfEmbeddedChild = mObjects.Length();

  mObjects.AppendElement(aAccessible);

}