//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Containing a Lambda candidate an cut parameters
//      
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
// Sverre Doerheim(original author)
//	
//      
//      
//-----------------------------------------------------------

#ifndef FOPILAMBDACAND_HH
#define FOPILAMBDACAND_HH

// Base Class Headers ----------------
#include "TObject.h"

// Collaborating Class Headers -------
#include <ostream> // remove if you do not need streaming op
#include <assert.h>

#include "TLorentzVector.h"
#include "TVector3.h"
#include "TMatrixT.h"


// Collaborating Class Declarations --
class GFTrack;
class TpcVertex;

class FopiLambdaCand : public TObject{
public:

  // Constructors/Destructors ---------

  FopiLambdaCand(){;}

  FopiLambdaCand(TLorentzVector state_,
                 TVector3 vertex_);
  FopiLambdaCand(const FopiLambdaCand&);

  ~FopiLambdaCand(){;}


  TVector3 extrapolateToVtx(double z){
    TVector3 dir=fstate.Vect();
    TVector3 pos(0,0,z);
    double t = (dir * pos - dir * fvertex) / (dir * dir);
    TVector3 poca=fvertex + t * dir;
    return poca;
  }

  void setPMom(TVector3 mom){fPMom=mom;}
  void setPiMom(TVector3 mom){fPiMom=mom;}
  void setVertexId(unsigned int id){fVertexId=id;}
  void setPTrackId(unsigned int id){fPTrackId=id;}
  void setPiTrackId(unsigned int id){fPiTrackId=id;}
  void setPCdcMass(double mass ){fPCdcMass=mass;}
  void setPiCdcMass(double mass ){fPiCdcMass=mass;}

  unsigned int getVertexId(){return fVertexId;}
  TLorentzVector getState(){return fstate;}
  TVector3 getPMom(){return fPMom;}
  TVector3 getPiMom(){return fPiMom;}
  TVector3 getVertex(){return fvertex;}
  unsigned int getPionTrackId(){return fPiTrackId;}
  unsigned int getProtonTrackId(){return fPTrackId;}
  double getPCdcMass(){return fPCdcMass;}
  double getPiCdcMass(){return fPiCdcMass;}

private:
  TLorentzVector fstate;
  //needed easy calculations
  TVector3 fPMom;
  TVector3 fPiMom;
  TVector3 fvertex;

  double fPCdcMass;
  double fPiCdcMass;

  unsigned int fVertexId; //tclonesarray ID of vertex
  unsigned int fPTrackId;
  unsigned int fPiTrackId;

public:
  ClassDef(FopiLambdaCand,5)

    };

#endif