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/* -*- 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/. */

#ifndef TransactionItem_h
#define TransactionItem_h

#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "nsCycleCollectionParticipant.h"
#include "nsISupportsImpl.h"
#include "nscore.h"

class nsITransaction;

namespace mozilla {

class TransactionManager;
class TransactionStack;

class TransactionItem final {
 public:
  explicit TransactionItem(nsITransaction* aTransaction);
  NS_METHOD_(MozExternalRefCountType) AddRef();
  NS_METHOD_(MozExternalRefCountType) Release();

  NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(TransactionItem)

  nsresult AddChild(TransactionItem* aTransactionItem);
  already_AddRefed<nsITransaction> GetTransaction();
  nsresult GetIsBatch(bool* aIsBatch);
  nsresult GetNumberOfChildren(int32_t* aNumChildren);
  nsresult GetChild(int32_t aIndex, TransactionItem** aChild);

  nsresult DoTransaction();
  nsresult UndoTransaction(TransactionManager* aTransactionManager);
  nsresult RedoTransaction(TransactionManager* aTransactionManager);

  nsCOMArray<nsISupports>& GetData() { return mData; }

 private:
  nsresult UndoChildren(TransactionManager* aTransactionManager);
  nsresult RedoChildren(TransactionManager* aTransactionManager);

  nsresult RecoverFromUndoError(TransactionManager* aTransactionManager);
  nsresult RecoverFromRedoError(TransactionManager* aTransactionManager);

  nsresult GetNumberOfUndoItems(int32_t* aNumItems);
  nsresult GetNumberOfRedoItems(int32_t* aNumItems);

  void CleanUp();

  ~TransactionItem();

  nsCycleCollectingAutoRefCnt mRefCnt;
  NS_DECL_OWNINGTHREAD

  nsCOMArray<nsISupports> mData;
  nsCOMPtr<nsITransaction> mTransaction;
  TransactionStack* mUndoStack;
  TransactionStack* mRedoStack;
};

}  // namespace mozilla

#endif  // #ifndef TransactionItem_h