////////////////////////////////////////////////////////////////////
/// \class GLG4PrimaryGeneratorAction
///
/// \author  Glenn Horton-Smith -- not on SNO+
/// \author Phil Jones <p.g.jones@qmul.ac.uk> -- contact person
///
/// REVISION HISTORY:\n
///     inherited as part of the generic GLG4 software
// new GLG4PrimaryGeneratorAction.hh by Glenn Horton-Smith, August 3-17, 2001
// This file is part of the GenericLAND software library.
////////////////////////////////////////////////////////////////////

#ifndef __GLG4PrimaryGeneratorAction_hh__
#define __GLG4PrimaryGeneratorAction_hh__ 1
////////////////////////////////////////////////////////////////
// GLG4PrimaryGeneratorAction
////////////////////////////////////////////////////////////////

#include "G4VUserPrimaryGeneratorAction.hh"  // for user primary vertex gen.
#include "GLG4GenList.hh"
#include <RAT/Profiler.hh>

class GLG4PrimaryGeneratorMessenger;
class G4Event;
class G4Track;

class GLG4PrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
{
public:
  GLG4PrimaryGeneratorAction();
  ~GLG4PrimaryGeneratorAction();

  void AddGenerator(GLG4Gen *gen);

  void GeneratePrimaries(G4Event * argEvent); // generate primary particles

  double GetUniversalTime() { return fUniversalTime; }

  double GetUniversalTimeSincePriorEvent()
  { return fUniversalTimeSincePriorEvent; }

  double GetEventWindow() { return fEventWindow; }
  void SetEventWindow(double argEventWindow);

  static GLG4PrimaryGeneratorAction* GetTheGLG4PrimaryGeneratorAction()
   { return fTheGLG4PrimaryGeneratorAction; }

  void DeferTrackToLaterEvent(const G4Track * track);

  void BeginOfRun( /*DS::Run& run*/ );
  void EndOfRun( /*DS::Run& run*/ );

  GLG4Gen *GetLastAddedGen() {return fLastAddedGen;}
  RAT::Profiler *GetProfiler() {return &fEventGenerateProfile;}

protected:
  GLG4PrimaryGeneratorMessenger *fMessenger;
  RAT::Profiler fEventGenerateProfile; // Profiled event generation

  double fUniversalTime;
  double fUniversalTimeSincePriorEvent;
  double fEventWindow;

  bool fNeedReset;
  GLG4GenList fGenList;
  // Keeps a pointer to the last generator added to the list
  // Useful to pass custom commands and allow the generator to repeat itself
  GLG4Gen     *fLastAddedGen;

  static GLG4PrimaryGeneratorAction* fTheGLG4PrimaryGeneratorAction;
};

#endif