#ifndef FITTER_ABSHIT_H
#define FITTER_ABSHIT_H

#include<iostream>

#include "TMatrixT.h"
#include "TObject.h"
#include "AbsTrackRep.h"
#include "DetPlane.h"

#include "MatrixPrinter.h"

    
class AbsRecoHit : public TObject{
protected:
  TMatrixT<double> _HMatrix;
  TMatrixT<double> _hitCoord;
  TMatrixT<double> _hitCov;

public:
  virtual ~AbsRecoHit();
  AbsRecoHit(int NparHit);
  AbsRecoHit();
  virtual void setHMatrix(const AbsTrackRep* stateVector,
			  const TMatrixT<double>& state)=0;
  
  inline TMatrixT<double> getHMatrix() const {return _HMatrix;}
  
  virtual TMatrixT<double> residualVector(const AbsTrackRep* stateVector,
					  const TMatrixT<double>& state) {
    setHMatrix(stateVector,state);
    return ( _hitCoord - (_HMatrix*state ));
  }

  virtual double residualScalar(const AbsTrackRep* stateVector,
				const TMatrixT<double>& state)=0;

  TMatrixT<double> getRawHitCov() const {return _hitCov;}
  TMatrixT<double> getRawHitCoord() const {return _hitCoord;}

  virtual TMatrixT<double> getHitCov(const DetPlane&)=0;
  virtual TMatrixT<double> getHitCoord(const DetPlane&)=0;
  
  // this will call the policy stuff in derived classes
  virtual const DetPlane& getDetPlane(const AbsTrackRep*)=0; 
   
  virtual AbsRecoHit* clone() = 0;
  virtual void Print() {_hitCoord.Print();}

  ClassDef(AbsRecoHit,1)

};
  

#endif //FITTER_ABSHIT_H