#ifndef ALITRDTRACKER_H
#define ALITRDTRACKER_H   

/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */ 

#include <TNamed.h>

class TFile;
class TParticle;
class TParticlePDG;
class TObjArray;

class AliTRDgeometry;
// class AliTRDtrackingSector;
class AliTRDtrack;
class AliTRDmcTrack;


class AliTRDtracker : public TNamed { 

 public:

  AliTRDtracker();
  AliTRDtracker(const Text_t* name, const Text_t* title);
  ~AliTRDtracker(); 

  virtual void  Clusters2Tracks(); 
  Double_t      ExpectedSigmaY2(Double_t r, Double_t tgl, Double_t pt);
  Double_t      ExpectedSigmaZ2(Double_t r, Double_t tgl);
  Int_t         FindProlongation(AliTRDtrack& t, AliTRDtrackingSector *sec,
                                 Int_t s, Int_t rf=0);
  void          GetEvent(const Char_t *hitfile, const Char_t *clusterfile);
  void          SetUpSectors(AliTRDtrackingSector *sec);
  virtual void  MakeSeeds(Int_t inner, Int_t outer);
  virtual void  FindTracks();
  virtual void  UseClusters(AliTRDtrack t);
  virtual Int_t GetTrackLabel(AliTRDtrack t);
  Int_t         WriteTracks(const Char_t *filename); 
  void          ReadClusters(TObjArray *array, const Char_t *filename, 
                             Int_t option = 1);

 protected:

  Int_t            fEvent;            // Event number

  AliTRDgeometry   *fGeom;            // Pointer to TRD geometry

  Int_t            fNclusters;        // Number of clusters in TRD 
  TObjArray        *fClusters;        // List of clusters for all sectors

  Int_t            fNseeds;           // Number of track seeds  
  TObjArray        *fSeeds;           // List of track seeds
   
  Int_t            fNtracks;          // Number of reconstructed tracks 
  TObjArray        *fTracks;          // List of reconstructed tracks   

  static const Int_t    fSeedGap;  // Distance between inner and outer
                                      // time bin in seeding
  
  static const Int_t    fSeedStep;    // Step in iterations
  static const Float_t 	fSeedDepth;   // Fraction of TRD allocated for seeding
  static const Float_t  fSkipDepth;   // Fraction of TRD which can be skipped
                                      // in track prolongation		   
  static const Double_t fMaxChi2;     // max increment in track chi2 
 	
  static const Float_t  fMinClustersInTrack; // min fraction of clusters in track
  static const Float_t  fMinClustersInSeed;  // min fraction of clusters in seed
  static const Float_t  fMaxSeedDeltaZ;  // max dZ in MakeSeeds
  static const Float_t  fMaxSeedC;       // max initial curvature in MakeSeeds
  static const Float_t  fMaxSeedTan;     // max initial Tangens(lambda) in MakeSeeds
  static const Float_t  fMaxSeedVertexZ; // max vertex Z in MakeSeeds
  static const Double_t fSeedErrorSY;    // sy parameter in MakeSeeds
  static const Double_t fSeedErrorSY3;   // sy3 parameter in MakeSeeds
  static const Double_t fSeedErrorSZ;    // sz parameter in MakeSeeds
  static const Float_t  fLabelFraction;  // min fraction of clusters in GetTrackLabel
  static const Float_t  fWideRoad;       // max road width in FindProlongation
 
  ClassDef(AliTRDtracker,1)           // manager base class  

};

#endif