#ifndef L3_BEAM_SPOT
#define L3_BEAM_SPOT
/* ************************************************************************* */
/* provides BeamSpot position uniformly for use in L3 modules                */
/* Author:    Fedor Ratnikov (CDF/Rutgers)                                   */
/* Date:      11/15/2001                                                     */
/* Supported algorithms:                                                     */
/*       0 - trivial case (0,0,0) position                                   */
/* $Id: L3BeamSpot.hh,v 1.1 2003/12/10 20:50:53 dldecker Exp $               */
/* ************************************************************************* */
#include <string>
#include <CLHEP/Geometry/Point3D.h>

class EventRecord;
class CotBeam;

class L3BeamSpot {
public:
  enum Algorithm {
    STATIC_0_0 = 0,
    CALIB_DB = 1,
    PREVIOUS_RUN = 2,
    SVX = 3,
    SVDD = 4,
    LAST = 4
  };
  
  L3BeamSpot ();
  ~L3BeamSpot ();
  
  void setAlgorithm (Algorithm fAlgorithm) {_mAlgoritm = fAlgorithm;}
  Algorithm algorithm () const {return _mAlgoritm;}
  HepPoint3D position (double fZ = 0.) const;
  bool isValid () const {return _mIsSet;}
  
  // reset position every run
  bool beginRun (const EventRecord* fEvent);
  // reset position every event
  bool event (const EventRecord* fEvent);
  
  static const std::string description ();
  const std::string status () const;
  static const char* algorithmName (int fAlgorithm);
protected:
  HepPoint3D _mBeamPosition;
  Algorithm _mAlgoritm;
  CotBeam* _mCotBeam;
  bool _mIsSet;
  double _mDxDz;
  double _mDyDz;
};

#endif