#ifndef ALITRDSEEDV1_H
#define ALITRDSEEDV1_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

////////////////////////////////////////////////////////////////////////////
//                                                                        //
//  The TRD track seed                                                    //
//                                                                        //
////////////////////////////////////////////////////////////////////////////

#ifndef ALITRDSEED_H
#include "AliTRDseed.h"
#endif

#ifndef ALIPID_H
#include "AliPID.h"
#endif

#ifndef ALIRIEMAN_H
#include "AliRieman.h"
#endif

class TTreeSRedirector;

class AliRieman;

class AliTRDtrackingChamber;
class AliTRDcluster;
class AliTRDtrack;
class AliTRDseedV1 : public AliTRDseed
{

  public:

	enum {
	  knSlices = 10
	};

	AliTRDseedV1(Int_t plane = -1);
	~AliTRDseedV1();
	AliTRDseedV1(const AliTRDseedV1 &ref);
	AliTRDseedV1& operator=(const AliTRDseedV1 &ref);

	Bool_t	AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr = kFALSE
                                 , AliTRDcluster *c=0x0);
	Bool_t	AttachClusters(AliTRDtrackingChamber *chamber, Bool_t kZcorr = kFALSE);
	void    CookdEdx(Int_t nslices);
	void    Draw(Option_t* o = "");
	Bool_t  Fit();

	void      Init(AliTRDtrack *track);
	inline void      Init(const AliRieman *fit);
	Bool_t    IsOwner() const          { return TestBit(1);}
	Bool_t    IsRowCross() const       { return TestBit(2);}

	inline Float_t   GetChi2Z(const Float_t z = 999.) const;
	inline Float_t   GetChi2Y(const Float_t y = 999.) const;
	void      GetCovAt(Double_t x, Double_t *cov) const;
	Double_t* GetCrossXYZ() { return &fCross[0];}
	Double_t  GetCrossSz2() const { return fCross[3];}
	Float_t*  GetdEdx() {return &fdEdx[0];}
	Float_t   GetdQdl(Int_t ic) const;
	Double_t  GetMomentum() const {return fMom;}
	Int_t     GetN() const {return fN2;}
	Float_t   GetQuality(Bool_t kZcorr) const;
	Int_t     GetPlane() const         { return fPlane;    }
	Double_t* GetProbability();
	Double_t  GetSnp() const           { return fSnp;}
	Double_t  GetTgl() const           { return fTgl;}
	Double_t  GetYat(Double_t x) const { return fYfitR[0] + fYfitR[1] * (x - fX0);}
	Double_t  GetZat(Double_t x) const { return fZfitR[0] + fZfitR[1] * (x - fX0);}
	
	void      Print(Option_t *o = "") const;
	
	void      SetMomentum(Double_t mom) {fMom = mom;}
	void      SetOwner(Bool_t own = kTRUE);
	void      SetPlane(Int_t p)                      { fPlane     = p;   }
	void      SetSnp(Double_t snp) {fSnp = snp;}
	void      SetTgl(Double_t tgl) {fTgl = tgl;}

 protected:

	void Copy(TObject &ref) const;

 private:

	Int_t            fPlane;                  //  TRD plane
	Float_t          fMom;                    //  Momentum estimate for tracklet [GeV/c]
	Float_t          fSnp;                    // sin of track with respect to x direction in XY plane	
	Float_t          fTgl;                    // tg of track with respect to x direction in XZ plane 	
	Float_t          fdX;                     // length of time bin
	Float_t          fdEdx[knSlices];         //  dE/dx measurements for tracklet
	Double_t         fCross[4];            // spatial parameters of the pad row crossing
	Double_t         fProb[AliPID::kSPECIES]; //  PID probabilities

	ClassDef(AliTRDseedV1, 1)                 //  New TRD seed 

};

//____________________________________________________________
inline Float_t AliTRDseedV1::GetChi2Z(const Float_t z) const
{
	Float_t z1  = (z == 999.) ? fMeanz : z;
	Float_t chi = fZref[0] - z1;
	return chi*chi;
}

//____________________________________________________________
inline Float_t AliTRDseedV1::GetChi2Y(const Float_t y) const
{
	Float_t y1  = (y == 999.) ? fYfitR[0] : y;
	Float_t chi = fYref[0] - y1;
	return chi*chi;
}

//____________________________________________________________
inline void AliTRDseedV1::Init(const AliRieman *rieman)
{
	fZref[0] = rieman->GetZat(fX0);
	fZref[1] = rieman->GetDZat(fX0);
	fYref[0] = rieman->GetYat(fX0);
	fYref[1] = rieman->GetDYat(fX0);
}

#endif