/* 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 nsCommandManager_h_
#define nsCommandManager_h_

#include "nsClassHashtable.h"
#include "nsCycleCollectionParticipant.h"
#include "nsICommandManager.h"
#include "nsString.h"
#include "nsWeakReference.h"

class nsIController;
template <class E>
class nsCOMArray;

class nsCommandManager final : public nsICommandManager,
                               public nsSupportsWeakReference {
 public:
  using ObserverList = nsTArray<nsCOMPtr<nsIObserver>>;

  nsCommandManager() = delete;

  /**
   * @param aWindow     An window which is what this command manager lives on.
   */
  explicit nsCommandManager(mozIDOMWindowProxy* aWindow);

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS_FINAL
  NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsCommandManager, nsICommandManager)

  NS_DECL_NSICOMMANDMANAGER

  /**
   * Notify the command manager that the status of a command changed. It may
   * have changed from enabled to disabled, or vice versa, or become toggled
   * etc.
   */
  void CommandStatusChanged(const char* aCommandName);

  bool IsCommandEnabled(const nsCString& aCommandName,
                        mozIDOMWindowProxy* aTargetWindow);

 protected:
  virtual ~nsCommandManager();

  nsresult GetControllerForCommand(const char* aCommand,
                                   mozIDOMWindowProxy* aDirectedToThisWindow,
                                   nsIController** aResult);

 protected:
  nsClassHashtable<nsCharPtrHashKey, ObserverList> mObserversTable;

  mozIDOMWindowProxy* mWindow;  // weak ptr. The window should always outlive us
};

nsCommandManager* nsICommandManager::AsCommandManager() {
  return static_cast<nsCommandManager*>(this);
}

const nsCommandManager* nsICommandManager::AsCommandManager() const {
  return static_cast<const nsCommandManager*>(this);
}

#endif  // nsCommandManager_h_