//Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved.
//See cxx source for full Copyright notice
//
//The purpose of this class is to permorm the ITS tracking.
//
//      The constructor has the task to inizialize some private members.
// The method DoTracking is written to be called by a macro. It gets the event
// number, the minimum and maximum order number of TPC tracks that are to be
// tracked trough the ITS, and the file where the recpoints are registered.
//
// The method AliiTStracking is a recursive function that performs the
// tracking trough the ITS
//
// The method Intersection found the layer, ladder and detector where the
// intersection take place and caluclate the cohordinates of this
// intersection.  It returns an integer that is 0 if the intersection has
// been found successfully.
//
// The two mwthods Kalmanfilter and kalmanfiltervert operate the
// kalmanfilter without and with the verteximposition respectively.

#ifndef ALIITSTRACKERV1_H
#define ALIITSTRACKERV1_H

#include <TObject.h>

class AliITS;
class TObjArray;
class TVector;
class TMatrix;
class AliITSTrackV1;
class AliITS;
class AliITSRad;
class AliITSgeoinfo;
class TStopwatch;

class AliITSTrackerV1 : public TObject {
 public:
    AliITSTrackerV1();
    AliITSTrackerV1(AliITS* IITTSS, Bool_t flag);
    AliITSTrackerV1(const AliITSTrackerV1 &cobj);
    ~AliITSTrackerV1();
    AliITSTrackerV1 &operator=(AliITSTrackerV1 obj);
    void DoTracking(Int_t evNumber, Int_t minTr, Int_t maxTr, TFile *file);
    void RecursiveTracking(TList *trackITSlist);
    Int_t Intersection(AliITSTrackV1 &track, Int_t layer,Int_t &ladder,
		       Int_t &detector); 
    void KalmanFilter(AliITSTrackV1 *newtrack, TVector &cluster,
		      Double_t sigma[2]);
    void KalmanFilterVert(AliITSTrackV1 *newtrack, TVector &cluster,
			  Double_t sigma[2]);
    //void KalmanFilterVert(AliITSTrackV1 *newtrack, TVector &cluster,
    //                      Double_t sigma[2], Double_t chi2pred);

 private:
    AliITS* fITS;              //! pointer to AliITS
    AliITSTrackV1 *fresult;    // result is a pointer to the final best track
    Double_t fPtref;           // transvers momentum obtained from TPC tracking
    Double_t fChi2max;         //  cluster with chi2>chi2max are cut. It is
                               // pt dependend.  aggiunto il 31-7-2001
    Double_t fepsphi;  //eps for definition window in phi aggiunto il 1-8-2001
    Double_t fepsz;  //eps for definition window in z aggiunto il 1-8-2001
    TObjArray  *frecPoints;    // pointer to RecPoints
    Int_t **fvettid;           // flag vector of used clusters
    Bool_t fflagvert;          // a flag to impose or not the vertex constraint
    AliITSRad *frl;            // pointer to get the radiation lenght matrix
    Int_t fNlad[6];            // Number of ladders for a given layer
    Int_t fNdet[6];            // Number of detector for a given layer
    Double_t fAvrad[6];        // Average radius for a given layer
    Double_t fDetx[6];// Semidimension of detectors along x axis for a given layer
    Double_t fDetz[6];// Semidimension of detectors along z axis for a given layer
    Double_t **fzmin;// Matrix of zmin for a given layer and a given detector
    Double_t **fzmax;// Matrix of zmax for a given layer and a given detector
    Double_t **fphimin;// Matrix of phimin for a given layer and a given ladder
    Double_t **fphimax;// Matrix of phimax for a given layer and a given ladder
    Double_t **fphidet; // azimuthal angle for a given layer and a given ladder
    Double_t fFieldFactor;     // Magnetic filed factor 
    //TStopwatch *fTimerKalman;         // timer for kalman filter
    //TStopwatch *fTimerIntersection;   // timer for Intersection 

    ClassDef(AliITSTrackerV1,1) //????
};

#endif