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#ifndef TrackReco_GsfTransientTrack_h
#define TrackReco_GsfTransientTrack_h

#include "TrackingTools/TransientTrack/interface/BasicTransientTrack.h"
#include "DataFormats/TrackReco/interface/Track.h" 
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h" 
#include "DataFormats/GsfTrackReco/interface/GsfTrack.h"
#include "DataFormats/GsfTrackReco/interface/GsfTrackFwd.h"
#include "TrackingTools/PatternTools/interface/TSCPBuilderNoMaterial.h"
#include "TrackingTools/PatternTools/interface/TransverseImpactPointExtrapolator.h"

namespace reco {

  class GsfTransientTrack : public GsfTrack, public BasicTransientTrack {
  public:

    // constructor from persistent track
    GsfTransientTrack(); 
    GsfTransientTrack( const GsfTrack & tk , const MagneticField* field); 
    GsfTransientTrack( const GsfTrackRef & tk , const MagneticField* field); 

    GsfTransientTrack( const GsfTrackRef & tk , const MagneticField* field, const edm::ESHandle<GlobalTrackingGeometry>& trackingGeometry);

    GsfTransientTrack( const GsfTrack & tk , const MagneticField* field, const edm::ESHandle<GlobalTrackingGeometry>& trackingGeometry);

    GsfTransientTrack( const GsfTransientTrack & tt );
    
    GsfTransientTrack& operator=(const GsfTransientTrack & tt);

    void setES(const edm::EventSetup& );

    void setTrackingGeometry(const edm::ESHandle<GlobalTrackingGeometry>& );

    void setBeamSpot(const reco::BeamSpot& beamSpot);

    FreeTrajectoryState initialFreeState() const {return initialFTS;}

    TrajectoryStateOnSurface outermostMeasurementState() const;

    TrajectoryStateOnSurface innermostMeasurementState() const;

    TrajectoryStateClosestToPoint 
      trajectoryStateClosestToPoint( const GlobalPoint & point ) const;

    TrajectoryStateOnSurface stateOnSurface(const GlobalPoint & point) const;

    TrajectoryStateClosestToPoint impactPointTSCP() const;

    TrajectoryStateOnSurface impactPointState() const;

    bool impactPointStateAvailable() const {return  initialTSOSAvailable;}

    GsfTrackRef persistentTrackRef() const { return tkr_; }

    TrackBaseRef trackBaseRef() const {return TrackBaseRef(tkr_);}

    TrackCharge charge() const {return GsfTrack::charge();}

    const MagneticField* field() const {return theField;}

    const Track & track() const {return *this;}

    TrajectoryStateClosestToBeamLine stateAtBeamLine() const;

  private:

    void init();
    void calculateTSOSAtVertex() const;

    GsfTrackRef tkr_;
    const MagneticField* theField;

    FreeTrajectoryState initialFTS;
    mutable bool initialTSOSAvailable, initialTSCPAvailable, blStateAvailable;
    mutable TrajectoryStateOnSurface initialTSOS;
    mutable TrajectoryStateClosestToPoint initialTSCP;
    TSCPBuilderNoMaterial builder;
    edm::ESHandle<GlobalTrackingGeometry> theTrackingGeometry;
    reco::BeamSpot theBeamSpot;
    mutable TrajectoryStateClosestToBeamLine trajectoryStateClosestToBeamLine;

    TransverseImpactPointExtrapolator theTIPExtrapolator;
  

  };

}

#endif