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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 mozilla_TransactionManager_h
#define mozilla_TransactionManager_h

#include "mozilla/TransactionStack.h"

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

class nsITransaction;
class nsITransactionListener;

namespace mozilla {

class TransactionManager final : public nsITransactionManager,
                                 public nsSupportsWeakReference {
 public:
  explicit TransactionManager(int32_t aMaxTransactionCount = -1);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(TransactionManager,
                                           nsITransactionManager)

  NS_DECL_NSITRANSACTIONMANAGER

  already_AddRefed<nsITransaction> PeekUndoStack();
  already_AddRefed<nsITransaction> PeekRedoStack();

  nsresult Undo();
  nsresult Redo();

  size_t NumberOfUndoItems() const { return mUndoStack.GetSize(); }
  size_t NumberOfRedoItems() const { return mRedoStack.GetSize(); }

  int32_t NumberOfMaximumTransactions() const { return mMaxTransactionCount; }

  bool EnableUndoRedo(int32_t aMaxTransactionCount = -1);
  bool DisableUndoRedo() { return EnableUndoRedo(0); }
  bool ClearUndoRedo() {
    if (NS_WARN_IF(!mDoStack.IsEmpty())) {
      return false;
    }
    mUndoStack.Clear();
    mRedoStack.Clear();
    return true;
  }

  bool AddTransactionListener(nsITransactionListener& aListener) {
    // XXX Shouldn't we check if aListener has already been in mListeners?
    return mListeners.AppendObject(&aListener);
  }
  bool RemoveTransactionListener(nsITransactionListener& aListener) {
    return mListeners.RemoveObject(&aListener);
  }

  nsresult WillDoNotify(nsITransaction* aTransaction, bool* aInterrupt);
  nsresult DidDoNotify(nsITransaction* aTransaction, nsresult aExecuteResult);
  nsresult WillUndoNotify(nsITransaction* aTransaction, bool* aInterrupt);
  nsresult DidUndoNotify(nsITransaction* aTransaction, nsresult aUndoResult);
  nsresult WillRedoNotify(nsITransaction* aTransaction, bool* aInterrupt);
  nsresult DidRedoNotify(nsITransaction* aTransaction, nsresult aRedoResult);
  nsresult WillBeginBatchNotify(bool* aInterrupt);
  nsresult DidBeginBatchNotify(nsresult aResult);
  nsresult WillEndBatchNotify(bool* aInterrupt);
  nsresult DidEndBatchNotify(nsresult aResult);
  nsresult WillMergeNotify(nsITransaction* aTop, nsITransaction* aTransaction,
                           bool* aInterrupt);
  nsresult DidMergeNotify(nsITransaction* aTop, nsITransaction* aTransaction,
                          bool aDidMerge, nsresult aMergeResult);

  /**
   * Exposing non-virtual methods of nsITransactionManager methods.
   */
  nsresult BeginBatchInternal(nsISupports* aData);
  nsresult EndBatchInternal(bool aAllowEmpty);

 private:
  virtual ~TransactionManager() = default;

  nsresult BeginTransaction(nsITransaction* aTransaction, nsISupports* aData);
  nsresult EndTransaction(bool aAllowEmpty);

  int32_t mMaxTransactionCount;
  TransactionStack mDoStack;
  TransactionStack mUndoStack;
  TransactionStack mRedoStack;
  nsCOMArray<nsITransactionListener> mListeners;
};

}  // namespace mozilla

mozilla::TransactionManager* nsITransactionManager::AsTransactionManager() {
  return static_cast<mozilla::TransactionManager*>(this);
}

#endif  // #ifndef mozilla_TransactionManager_h