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// ====================================================================
//
//   G4HepMCInterface.hh
//   $Id: G4HepMCInterface.h,v 1.5 2011/02/15 01:05:25 dengzy Exp $
//
//   A base class for primary generation via HepMC object.
//   This class is derived from G4VPrimaryGenerator.
//
// ====================================================================
#ifndef G4_HEPMC_INTERFACE_H
#define G4_HEPMC_INTERFACE_H

#include <vector>
#include "G4VPrimaryGenerator.hh"
#include <HepMC/GenEvent.h>
#include "G4Svc/G4HepMCParticle.h"
#include "RealizationSvc/RealizationSvc.h"
#include "RealizationSvc/IRealizationSvc.h"

class G4HepMCInterface : public G4VPrimaryGenerator
{
public:
  // static service method for conversion from HepMC::GenEvent to G4Event
  void HepMC2G4( HepMC::GenEvent* hepmcevt, G4Event* g4event);
  void Print(const HepMC::GenEvent* hepmcevt);
  G4int CheckType(const HepMC::GenEvent* hepmcevt);
  void Boost( HepMC::GenEvent* hepmcevt);
  void PrintHPlist();

  G4int GetLogLevel() {return m_logLevel;}
  void SetLogLevel(G4int level) {m_logLevel = level;}

  // static service method for checking a point is included in the (current) world
  // static G4bool CheckVertexInsideWorld(const G4ThreeVector& pos);
  // ------------> This method has been moved to the base class

protected:
  // Note that the life of HepMC event object must be handled by users.
  // In the default implementation, a current HepMC event will be
  // deleted at GeneratePrimaryVertex() in the next event.
  HepMC::GenEvent* hepmcEvent; // (care for single event case only)

  // Implement this method in his/her own concrete class.
  // An empty event will be created in default.
  virtual HepMC::GenEvent* GenerateHepMCEvent();
  G4int m_logLevel;

public: 
  G4HepMCInterface();
  virtual ~G4HepMCInterface();

  // set/get methods
  HepMC::GenEvent* GetHepMCGenEvent() const;

  // The default behavior is that a single HepMC event generated by
  // GenerateHepMCEvent() will be converted to G4Event through HepMC2G4().
  virtual void GeneratePrimaryVertex(G4Event* anEvent);

  std::vector<G4HepMCParticle*> HPlist;

private:
  RealizationSvc* m_RealizationSvc;
};

// ====================================================================
// inline functions
// ====================================================================

inline HepMC::GenEvent* G4HepMCInterface::GetHepMCGenEvent() const 
{ 
  return hepmcEvent; 
}

#endif

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