//-*- Mode: C++ -*-
  // *****************************************************************************
  //                                                                             *
  // @Autors: I.Kulakov; M.Pugach; M.Zyzak; I.Kisel                                        *
  // @e-mail: I.Kulakov@gsi.de; M.Pugach@gsi.de; M.Zyzak@gsi.de; I.Kisel@compeng.uni-frankfurt.de *
  //                                                                             *
  // *****************************************************************************

#ifndef FTSCATARGET_H
#define FTSCATARGET_H


#include "PndFTSCATrackParam.h"
#include "PndFTSCAParam.h"
#include "CAFieldValue.h"


class FTSCATarget {
  
  /**
 * @class FTSCATarget
 *
 * The FTSCATarget class is the representation of target parameters
 */
  
 public:
  FTSCATarget():fX0(0), fX1(0), fX2(0), fDX1(-1), fDX2(-1), fDQMom(-1), fB(), fNDF(-1) {};
  FTSCATarget( const float &x0, const float &x1, const float &x2, const float &dx1, const float &dx2, const float &dqmom, const PndFTSCAParam &param, const int &ndf ):
    fX0(x0), fX1(x1), fX2(x2), fDX1(dx1), fDX2(dx2), fDQMom(dqmom), fNDF(ndf) {
    fB[0] = param.VtxFieldValue(0);
    fZB[0] = param.ZVtxFieldValue(0);
    fB[1] = param.VtxFieldValue(1);
    fZB[1] = param.ZVtxFieldValue(1);
  };

  float SetErrQMom( float v ) { return fDQMom = v; }
  
  float X0() const { return fX0; }
  float X1() const { return fX1; }
  float X2() const { return fX2; }

  float Err2X1() const { return fDX1*fDX1; }
  float Err2X2() const { return fDX2*fDX2; }
  float Err2QMom() const { return fDQMom*fDQMom; }
  float DQMom() const { return fDQMom*fDQMom; }
  const CAFieldValue& B( int i = 0 ) const { return fB[i]; }
  const float_v& ZB( int i ) const { return fZB[i]; }
  int NDF() const { return fNDF; }
  
 private:
  float fX0, fX1, fX2, fDX1, fDX2, fDQMom;

  CAFieldValue fB[2];
  float_v fZB[2]; // fZ position of the field point
  
  int fNDF; // 0 or 2, depends whether we consider target as a measurement
};

#endif