/* -*- 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/ChildSHistory.h"

#include "mozilla/dom/ChildSHistoryBinding.h"

#include "mozilla/dom/ContentFrameMessageManager.h"

#include "nsIMessageManager.h"

#include "nsComponentManagerUtils.h"

#include "nsSHistory.h"

#include "nsDocShell.h"

#include "nsISHEntry.h"

#include "nsXULAppAPI.h"

namespace mozilla {

namespace dom {

ChildSHistory::ChildSHistory(nsDocShell* aDocShell)

  : mDocShell(aDocShell)

  , mHistory(new nsSHistory())

{

  MOZ_ASSERT(mDocShell);

  mHistory->SetRootDocShell(mDocShell);

}

ChildSHistory::~ChildSHistory()

{

}

int32_t

ChildSHistory::Count()

{

  return mHistory->GetCount();

}

int32_t

ChildSHistory::Index()

{

  int32_t index;

  mHistory->GetIndex(&index);

  return index;

}

void

ChildSHistory::Reload(uint32_t aReloadFlags, ErrorResult& aRv)

{

  aRv = mHistory->Reload(aReloadFlags);

}

bool

ChildSHistory::CanGo(int32_t aOffset)

{

  CheckedInt<int32_t> index = Index();

  index += aOffset;

  if (!index.isValid()) {

    return false;

  }

  return index.value() < Count() && index.value() >= 0;

}

void

ChildSHistory::Go(int32_t aOffset, ErrorResult& aRv)

{

  CheckedInt<int32_t> index = Index();

  index += aOffset;

  if (!index.isValid()) {

    aRv.Throw(NS_ERROR_FAILURE);

    return;

  }

  aRv = mHistory->GotoIndex(index.value());

}

void

ChildSHistory::EvictLocalContentViewers()

{

  mHistory->EvictAllContentViewers();

}

nsISHistory*

ChildSHistory::LegacySHistory()

{

  return mHistory;

}

ParentSHistory*

ChildSHistory::GetParentIfSameProcess()

{

  if (XRE_IsContentProcess()) {

    return nullptr;

  }

  MOZ_CRASH("Unimplemented!");

}

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChildSHistory)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(ChildSHistory)

NS_IMPL_CYCLE_COLLECTING_RELEASE(ChildSHistory)

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(ChildSHistory,

                                      mDocShell,

                                      mHistory)

JSObject*

ChildSHistory::WrapObject(JSContext* cx, JS::Handle<JSObject*> aGivenProto)

{

  return ChildSHistory_Binding::Wrap(cx, this, aGivenProto);

}

nsISupports*

ChildSHistory::GetParentObject() const

{

  // We want to get the TabChildMessageManager, which is the

  // messageManager on mDocShell.

  RefPtr<ContentFrameMessageManager> mm;

  if (mDocShell) {

    mm = mDocShell->GetMessageManager();

  }

  // else we must be unlinked... can that happen here?

  return ToSupports(mm);

}

} // namespace dom

} // namespace mozilla