// -------------------------------------------------------------------------
// -----                      R3BMCTrack header file                   -----
// -----                  Created 03/08/04                             -----
// -------------------------------------------------------------------------


/** R3BMCTrack.h
 **/


#ifndef R3BMCTRACK_H
#define R3BMCTRACK_H 1


#include "ASYEOSDetectorList.h"

#include "TLorentzVector.h"
#include "TObject.h"
#include "TParticle.h"
#include "TVector3.h"

#ifndef ROOT_TParticlePDG
 #include "TParticlePDG.h"
#endif
#ifndef ROOT_TDatabasePDG
 #include "TDatabasePDG.h"
#endif


class R3BMCTrack : public TObject
{

 public:


  /**  Default constructor  **/
  R3BMCTrack();


  /**  Standard constructor  **/
  R3BMCTrack(Int_t pdgCode, Int_t motherID, Double_t px, Double_t py,
	     Double_t pz, Double_t x, Double_t y, Double_t z, 
	     Double_t t, Int_t nPoints);

  /**  Copy constructor  **/
  R3BMCTrack(const R3BMCTrack& track);


  /**  Constructor from TParticle  **/
  R3BMCTrack(TParticle* particle, Int_t fMC);


  /**  Destructor  **/
  virtual ~R3BMCTrack();


  /**  Output to screen  **/
  void Print(Int_t iTrack=0) const;


  /**  Accessors  **/
  Int_t    GetPdgCode()  const { return fPdgCode; }
  Int_t    GetMotherId() const { return fMotherId; }
  Double_t GetPx()       const { return fPx; }
  Double_t GetPy()       const { return fPy; }
  Double_t GetPz()       const { return fPz; }
  Double_t GetStartX()   const { return fStartX; }
  Double_t GetStartY()   const { return fStartY; }
  Double_t GetStartZ()   const { return fStartZ; }
  Double_t GetStartT()   const { return fStartT; }
  Double_t GetMass()     const;
  Double_t GetEnergy()   const;
  Double_t GetPt()       const { return TMath::Sqrt(fPx*fPx+fPy*fPy); }
  Double_t GetP() const { return TMath::Sqrt(fPx*fPx+fPy*fPy+fPz*fPz); }
  Double_t GetRapidity() const;
  void GetMomentum(TVector3& momentum); 
  void Get4Momentum(TLorentzVector& momentum);
  void GetStartVertex(TVector3& vertex);


  /** Accessors to the number of MCPoints in the detectors **/
  Int_t GetNPoints(DetectorId detId)  const;


  /**  Modifiers  **/
  void SetMotherId(Int_t id) { fMotherId = id; }
  void SetNPoints(Int_t iDet, Int_t np);



private:

  /**  PDG particle code  **/
  Int_t  fPdgCode;

  /**  Index of mother track. -1 for primary particles.  **/
  Int_t  fMotherId;

  /** Momentum components at start vertex [GeV]  **/
  Double32_t fPx, fPy, fPz;

  /** Coordinates of start vertex [cm, ns]  **/
  Double32_t fStartX, fStartY, fStartZ, fStartT;

  /**  Bitvector representing the number of MCPoints for this track in 
   **  each subdetector. The detectors are represented by
   **  REF:         Bit  0      (1 bit,  max. value  1)
   **  The respective point numbers can be accessed and modified 
   **  with the inline functions. 
   **  Bits 26-31 are spare for potential additional detectors.
   **/
  Int_t fNPoints;

  // case of HIons
  Double32_t fMass;


  ClassDef(R3BMCTrack,1);

};



// ==========   Inline functions   ========================================

inline Double_t R3BMCTrack::GetEnergy() const {
  Double_t mass = GetMass();
  return TMath::Sqrt(mass*mass + fPx*fPx + fPy*fPy + fPz*fPz );
}


inline void R3BMCTrack::GetMomentum(TVector3& momentum) { 
  momentum.SetXYZ(fPx,fPy,fPz); 
}


inline void R3BMCTrack::Get4Momentum(TLorentzVector& momentum) {
  momentum.SetXYZT(fPx,fPy,fPz,GetEnergy()); 
}


inline void R3BMCTrack::GetStartVertex(TVector3& vertex) { 
  vertex.SetXYZ(fStartX,fStartY,fStartZ); 
}



#endif