////////////////////////////////////////////////////////////////////////
/// \class RAT::Gen_Null
///
/// \brief Top Level Null Event Producer
///
///  \author Tereza Kroupova <kroupa@upenn.sas.edu> -- contact person
///
///  REVISION HISTORY\n
///   14-12-2021 - T. Kroupova - New file
///
///  \details This generator simulates empty events with no primary particles
///           nor vertices. Allows "standalone" application of processors.
///
////////////////////////////////////////////////////////////////////////


#ifndef __RAT_Gen_Null__
#define __RAT_Gen_Null__

#include <vector>
#include <RAT/GLG4Gen.hh>

class G4ParticleDefinition;

namespace RAT {

class Gen_NullMessenger;

class Gen_Null : public GLG4Gen {
public:
  Gen_Null();
  virtual ~Gen_Null();

  // Main function - Calls nothing in this case
  virtual void GenerateEvent(G4Event *event);
  // Required by GLG4 - Always returns true
  virtual bool IsRepeatable() const { return true; };

  // Set the state - only specifying time generator in this case
  // @param[in] state SetState state
  virtual void SetState(G4String state);
  // Return the set time generator
  virtual G4String GetState() const;

  // Specify the type of time generator to use to give time events Null events, default is Poisson
  // @param[in] state the time generator
  virtual void SetTimeGen(G4String generator);

  // Specify parameters for time generator for between null events (eg from generator/rate/ commands)
  // @param[in] state the time generator state
  virtual void SetTimeState(G4String state);
  // get parameters for time generator for between events (eg from generator/rate/ commands)
  virtual G4String GetTimeState() const;

  // Reset the event time, overwritting virtual GLG4Gen::ResetTime
  // @param[in] offset to be applied to the next event time
  virtual void ResetTime(double offset=0.0);

protected:
  G4String fStateStr;

};

} // namespace RAT

#endif