/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
//
// Static function member which can be used in standalone cases
// especially as utils for AliTPCCosmicTrackfit
//
// detailed description can be found inside individual function
//
// grep "exitreport" in output log to check abnormal termination
//
//  Xianguo Lu 
//  lu@physi.uni-heidelberg.de
//  Xianguo.Lu@cern.ch
//

#ifndef ALITPCCOSMICUTILS_H
#define ALITPCCOSMICUTILS_H

class AliTPCCosmicUtils
{
 public:
  static AliTPCseed * GetTPCseed(const AliESDtrack *esdtrack);
    
  static AliExternalTrackParam *MakeSeed(const AliTPCseed *tseed);

  static void SingleFit(AliExternalTrackParam * trackInOld, AliExternalTrackParam * trackOutOld, const AliTPCseed *tseed, const Bool_t kinward, const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, TTreeSRedirector *debugstreamer=0x0);

  static void CombinedFit(AliExternalTrackParam *trackPars[],  const AliTPCseed *seeds[],  const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, Double_t &lfit, Double_t &vtxD, TTreeSRedirector *debugstreamer=0x0);

  static void DrawTracks(AliESDtrack *esdtrks[], const TString tag, const TString outputformat="png");
  static void DrawSeeds(const AliTPCseed * seeds[], const TString tag, const TString outputformat="png");
  static void PrintTrackParam(const Int_t id, const AliExternalTrackParam * trackpar, const char *tag="");
  static Bool_t RotateSafe(AliExternalTrackParam *trackPar, const Double_t aa);
  static Double_t AngleInRange(Double_t phi);
  static Double_t Point2LineDist(const TVector3 p0, const TVector3 l1, const TVector3 l2);

 private:
  static void IniCov(AliExternalTrackParam *trackPar, const Double_t ncl);
  static void SubCombined(AliExternalTrackParam *trackPar, const AliTPCseed *seeds[], const Int_t tk0, const Int_t tk1, const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, const Double_t eloss, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, Double_t &lfit, Double_t &vtxD, TTreeSRedirector *debugstreamer=0x0);
  static void FitKernel(AliExternalTrackParam *trackPar, const AliTPCseed *tseed, const Int_t rowstart, const Int_t rowstop, const Int_t drow, const Double_t xmin, const Double_t xmax, const Double_t eloss, Int_t &ksite, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, TVector3 &gposStart, TVector3 &gposStop, TTreeSRedirector *debugstreamer, const Bool_t kinicov);

  static const Int_t fgkNRow = 159;           //number of pad rows
  static const Int_t fgkNclsMin = 40;         //minimum requirement of number of TPC cluster
  static const Int_t fgkXMin = 80;            //minimum x (tracking system) to use in propagation
  static const Double_t fgkMass = 0.105658;   //muon mass
  static const Int_t fgkNiter = 2;            //number of iteration in SingleFit and CombinedFit, 1 is not enough, 3 is the same as 2
};

#endif