/*
 * ObservedMaximumAtomTrajectorySize.hpp
 *
 *  Created on: Nov 10, 2025
 *      Author: heber
 */


#ifndef OBSERVEDMAXIMUMTRAJECTORYSIZE_HPP_
#define OBSERVEDMAXIMUMTRAJECTORYSIZE_HPP_

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif


#include "CodePatterns/Singleton.hpp"
#include "CodePatterns/Observer/Observable.hpp"
#include "CodePatterns/Observer/Observer.hpp"

/**
 * Relays the updates from all (individual!) Atom::TrajectoryChanged
 * received through the AtomObserver, computes the maximum trajectory
 * size over all atoms from that and provides this as an observable
 * derived value.
 * 
 * This can then be used inside an \a ObservedValue to pass on to
 * the Qt side of molecuilder.
 */
class ObservedMaximumAtomTrajectorySize : 
  public Singleton<ObservedMaximumAtomTrajectorySize>, 
  public Observable
{
public:
  //!> grant Singleton access to cstor and dstor.
  friend class Singleton< ObservedMaximumAtomTrajectorySize >;

  enum NotificationType {
    MaximumChanged,
    NotificationType_MAX  // denotes the maximum of available notification types
  };

  /** Dstor of ObservedMaximumAtomTrajectorySize.
   *
   */
  virtual ~ObservedMaximumAtomTrajectorySize();

  const int GetMaximumAtomTrajectorySize() const;

  // Observer functions
  void update(Observable *publisher);
  void subjectKilled(Observable *publisher);
  void recieveNotification(Observable *publisher, Notification_ptr notification);

private:

  /** private cstor of ObservedMaximumAtomTrajectorySize due to singleton.
   */
  ObservedMaximumAtomTrajectorySize();

private:
  //!> maximum size over all current atom trajectories
  int maximumAtomTrajectorySize;

  //!> whether we are signed on to AtomObserver
  bool atomObserver_signedOn;
};

#endif /* OBSERVEDMAXIMUMTRAJECTORYSIZE_HPP_ */