#ifndef ALIITSSADEDXFITTER_H
#define ALIITSSADEDXFITTER_H
/* Copyright(c) 2007-2011, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

///////////////////////////////////////////////////////////////////////
// Class with the fits algorithms to be used in the identified       //
// spectra analysis using the ITS in stand-alone mode                //
// Author: E.Biolcati, biolcati@to.infn.it                           //
//         F.Prino, prino@to.infn.it                                 //
///////////////////////////////////////////////////////////////////////

#include <TObject.h>
#include "AliITSPIDResponse.h"

class TGraph;

class AliITSsadEdxFitter  : public TObject {

 public:
  AliITSsadEdxFitter();
  AliITSsadEdxFitter(Bool_t isMC);
  virtual ~AliITSsadEdxFitter(){
    delete fITSpid;
  };

  Double_t CalcSigma(Int_t code,Float_t x) const;
  Int_t InitializeMeanPosParam(Int_t code,Float_t x);
  Int_t InitializeMeanPosBB(Int_t code,Float_t x);
  void Initialize(TH1F* h,Int_t code,Int_t bin); 

  void GetFitPar(Double_t *fitpar, Double_t *fitparerr) const;
  Double_t GetFitPar(Int_t nparam) const {
    if(nparam<9) return fFitPars[nparam];
    return -1.;
  }
  Double_t GetFitParError(Int_t nparam) const {
    if(nparam<9) return fFitParErrors[nparam];
    return -1.;
  }

  void DoFitTail(TH1F *h, Int_t bin, Int_t code);
  void DoFit(TH1F *h, Int_t bin, Int_t code, TGraph *gres);
  void DoFitProton(TH1F *h, Int_t bin, Int_t code, TGraph *gres);
  void DoFitOnePeak(TH1F *h, Int_t bin, Int_t signedcode);
  void DoFitProtonFirst(TH1F *h, Int_t bin, Int_t signedcode, TGraph *gres);
  void FillHisto(TH1F *hsps, Int_t bin, Float_t binsize, Int_t code);
  void FillHistoMC(TH1F *hsps, Int_t bin, Int_t code, TH1F *h);
  Bool_t IsGoodBin(Int_t bin,Int_t code);

  void SetMCConfig(){
    fIsMC=kTRUE;
    if(fITSpid) delete fITSpid;
    fITSpid=new AliITSPIDResponse(kTRUE);	  
  }
  void SetDataConfig(){
    fIsMC=kFALSE;
    if(fITSpid) delete fITSpid;
    fITSpid=new AliITSPIDResponse(kFALSE);	  
  }

  void SetInitializationOption(Char_t opt){
    fOptInit=opt;
  }

  void SetUseLoglikelihoodFit(){
    fFitOption="LL0R+";
  }
  void SetUseChisquareFit(){
    fFitOption="0R+";
  }
  void SetUseMinuitImproveFit(){
    fFitOption="M0R+";
  }

  void SetRangeStep1(Double_t dxlow=-0.2, Double_t dxup=0.3){
    fRangeStep1[0]=dxlow;
    fRangeStep1[1]=dxup;
  }
  void SetRangeStep2(Double_t dxlow=-0.1, Double_t dxup=0.4){
    fRangeStep2[0]=dxlow;
    fRangeStep2[1]=dxup;
  }
  void SetRangeStep3(Double_t dxlow=-0.1, Double_t dxup=2.5){
    fRangeStep3[0]=dxlow;
    fRangeStep3[1]=dxup;
  }
  void SetRangeFinalStep(Double_t dxlow=-3.5, Double_t dxup=3.5){
    fRangeStep4[0]=dxlow;
    fRangeStep4[1]=dxup;
  }
  void SetLimitsOnSigmaPion(Double_t smin=0.95, Double_t smax=1.05){
    fLimitsOnSigmaPion[0]=smin;
    fLimitsOnSigmaPion[1]=smax;
  }
  void SetLimitsOnSigmaKaon(Double_t smin=0.95, Double_t smax=1.05){
    fLimitsOnSigmaKaon[0]=smin;
    fLimitsOnSigmaKaon[1]=smax;
  }
  void SetLimitsOnSigmaProton(Double_t smin=0.95, Double_t smax=1.05){
    fLimitsOnSigmaProton[0]=smin;
    fLimitsOnSigmaProton[1]=smax;
  }
  void SetBinsUsedPion(Int_t bmin=2, Int_t bmax=14){
    fBinsUsedPion[0]=bmin;
    fBinsUsedPion[1]=bmax;
  }
  void SetBinsUsedKaon(Int_t bmin=7, Int_t bmax=12){
    fBinsUsedKaon[0]=bmin;
    fBinsUsedKaon[1]=bmax;
  }
  void SetBinsUsedProton(Int_t bmin=8, Int_t bmax=17){
    fBinsUsedProton[0]=bmin;
    fBinsUsedProton[1]=bmax;
  }

  void PrintAll() const;
  void PrintInitialValues() const;
  void CalcResidual(TH1F *h,TF1 *fun,TGraph *gres) const;
  Double_t GausPlusTail(const Double_t x, const Double_t mean, Double_t rms, Double_t c, Double_t slope, Double_t cut ) const;  
  Double_t GausOnBackground(const Double_t* x, const Double_t *par) const;
  void DrawFitFunction(TF1 *fun) const;

 private:
  AliITSsadEdxFitter(const AliITSsadEdxFitter& s);
  AliITSsadEdxFitter& operator=(const AliITSsadEdxFitter& s);

  Double_t fFitPars[9];       // array with fit parameters
  Double_t fFitParErrors[9];  // array with fit parameter errors
  Double_t fFitpar[3];     // array with fit parameters for sel. peak
  Double_t fFitparErr[3];  // array with fit parameter errors for sel. peak
  Double_t fRangeStep1[2]; // Range for Step1 (w.r.t pion peak)
  Double_t fRangeStep2[2]; // Range for Step2 (w.r.t kaon/proton peak)
  Double_t fRangeStep3[2]; // Range for Step3 (w.r.t proton/kaon peak)
  Double_t fRangeStep4[2]; // Range for Last Fit
  Double_t fLimitsOnSigmaPion[2]; // limits on sigma pions
  Double_t fLimitsOnSigmaKaon[2]; // limits on sigma kaons
  Double_t fLimitsOnSigmaProton[2]; // limits on sigma protons
  
  Double_t fExpPionMean;    // expected mean for pion peak
  Double_t fExpKaonMean;    // expected mean for kaon peak
  Double_t fExpProtonMean;  // expected mean for proton peak
  Double_t fExpPionMeanRange;    // expected range for pion peak mean
  Double_t fExpKaonMeanRange;    // expected range for kaon peak mean
  Double_t fExpProtonMeanRange;  // expected range for proton peak mean
  Double_t fExpPionSigma;   // expected sigma for pion peak
  Double_t fExpKaonSigma;   // expected sigma for kaon peak
  Double_t fExpProtonSigma; // expected sigma for proton peak
  Double_t fExpPionAmpl;    // epxeted area under pion peak

  Int_t fBinsUsedPion[2];   // limits on bins used pions
  Int_t fBinsUsedKaon[2];   // limits on bins used kaons
  Int_t fBinsUsedProton[2]; // limits on bins used protons

  Bool_t fIsMC;                 // flag MC/data
  Char_t fOptInit;              // option for initialization
  TString fFitOption;           // option for fitting
  AliITSPIDResponse* fITSpid;   // ITS pid object


  ClassDef(AliITSsadEdxFitter,4);
};

#endif