#ifndef _TOPSIM_G4INTERFACE_H_
#define _TOPSIM_G4INTERFACE_H_

#include "G4BeamTestRunManager.h"
/* #include <icetray/I3Logging.h> */

#ifdef G4VIS_USE
class G4VisManager;
#endif

class I3Particle;
class G4BeamTestTank;
class G4BeamTestDetectorConstruction;

/**
 * Top-level class to handle Geant4. All global things are initialized here (run manager, visualization manager, detector construction, physics list and user actions).
 */

class G4Interface
{
 public:
  G4Interface(const std::string& visMacro="");
  ~G4Interface();

  //  Static method which returns the singleton pointer to this class
  static G4Interface* GetInstance() {return g4Interface_;}

  /// Add a tank to the geometry. Should not be called after initialized.
  void InstallTank(G4BeamTestTank* tank);

  /// Initialize event. Most Geant4 global things are initialized the first time this is called.
  void InitializeEvent();
  /// To be called after simulating each IceTray event.
  void TerminateEvent();
  /// Simulate a single particle (InitializeEvent must be called first)
  void InjectParticle(const std::string& particleName,
          const G4ThreeVector& particlePosition,
          const G4ThreeVector& particleDirection,
          const G4double particleEnergy);

 private:
  void Initialize();

  static G4Interface* g4Interface_;

  G4BeamTestRunManager runManager_;

#ifdef G4VIS_USE
  G4VisManager* visManager_;
#endif

  G4BeamTestDetectorConstruction* detector_;
  bool initialized_;
  bool eventInitialized_;
  std::string visMacro_;

  /* SET_LOGGER("G4Interface"); */
};

#endif