/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/a11y/DocAccessibleParent.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "mozilla/WindowsVersion.h"
#include "MsaaRootAccessible.h"
#include "Relation.h"
#include "RootAccessible.h"
#include "EnumVariant.h"

#include <oleauto.h>

using namespace mozilla;
using namespace mozilla::a11y;

RootAccessible* MsaaRootAccessible::RootAcc() {
  return static_cast<RootAccessible*>(LocalAcc());
}

////////////////////////////////////////////////////////////////////////////////
// Aggregated IUnknown
HRESULT
MsaaRootAccessible::InternalQueryInterface(REFIID aIid, void** aOutInterface) {
  if (!aOutInterface) {
    return E_INVALIDARG;
  }

  // InternalQueryInterface should always return its internal unknown
  // when queried for IID_IUnknown...
  if (aIid == IID_IUnknown) {
    RefPtr<IUnknown> punk(&mInternalUnknown);
    punk.forget(aOutInterface);
    return S_OK;
  }

  if (StaticPrefs::accessibility_uia_enable() &&
      aIid == IID_IRawElementProviderFragmentRoot) {
    RefPtr<IRawElementProviderFragmentRoot> root = this;
    root.forget(aOutInterface);
    return S_OK;
  }

  // ...Otherwise we pass through to the base COM implementation of
  // QueryInterface which is provided by MsaaDocAccessible.
  return MsaaDocAccessible::QueryInterface(aIid, aOutInterface);
}

ULONG
MsaaRootAccessible::InternalAddRef() { return MsaaDocAccessible::AddRef(); }

ULONG
MsaaRootAccessible::InternalRelease() { return MsaaDocAccessible::Release(); }

already_AddRefed<IUnknown> MsaaRootAccessible::Aggregate(IUnknown* aOuter) {
  MOZ_ASSERT(mOuter &&
             (mOuter == &mInternalUnknown || mOuter == aOuter || !aOuter));
  if (!aOuter) {
    // If there is no aOuter then we should always set mOuter to
    // mInternalUnknown. This is standard COM aggregation stuff.
    mOuter = &mInternalUnknown;
    return nullptr;
  }

  mOuter = aOuter;
  return GetInternalUnknown();
}

already_AddRefed<IUnknown> MsaaRootAccessible::GetInternalUnknown() {
  RefPtr<IUnknown> result(&mInternalUnknown);
  return result.forget();
}