#ifndef ALIHFMASSFITTER_H
#define ALIHFMASSFITTER_H
/* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */ 

/////////////////////////////////////////////////////////////
//
// AliHFMassFitter for the fit of invariant mass distribution
// of charmed mesons
//
// Author: C.Bianchin, chiara.bianchin@pd.infn.it
/////////////////////////////////////////////////////////////

#include <TNamed.h>
#include <TString.h>

class TF1;
class TNtuple;
class TFile;
class TList;
class TH1F;
class TVirtualPad;

class AliHFMassFitter : public TNamed {

 public:

  enum ETypeOfBkg{ kExpo=0, kLin=1, kPol2=2, kNoBk=3, kPow=4, kPowEx=5 };
  enum ETypeOfSgn{ kGaus=0, k2Gaus=1  };

  AliHFMassFitter();
  AliHFMassFitter(const TH1F* histoToFit, Double_t minvalue, Double_t maxvalue, Int_t rebin=1, Int_t fittypeb=kExpo, Int_t fittypes=kGaus);
  virtual ~AliHFMassFitter();

  AliHFMassFitter(const AliHFMassFitter &mfit);
  AliHFMassFitter& operator=(const AliHFMassFitter &mfit);

  //setters
  void     SetHisto(const TH1F *histoToFit);
  void     SetRangeFit(Double_t minvalue, Double_t maxvalue){fminMass=minvalue; fmaxMass=maxvalue; CheckRangeFit();}
  void     SetMinRangeFit(Double_t minvalue){fminMass=minvalue;printf("CheckRangeFit after SetMaxRangeFit is also set\n");}
  void     SetMaxRangeFit(Double_t maxvalue){fmaxMass=maxvalue;printf("CheckRangeFit after SetMinRangeFit is also set\n");}
  void     SetBinN(Int_t newbinN){fNbin=newbinN;}
  void     SetType(Int_t fittypeb, Int_t fittypes);
  void     SetReflectionSigmaFactor(Int_t constant) {ffactor=constant;}
  void     SetInitialGaussianMean(Double_t mean) {fMass=mean;} // change the default value of the mean
  void     SetInitialGaussianSigma(Double_t sigma) {fSigmaSgn=sigma;} // change the default value of the sigma
  void     SetSideBands(Bool_t onlysidebands=kTRUE) {fSideBands=onlysidebands;} // consider only side bands
  void     SetFixParam(Bool_t *fixpar){fFixPar=fixpar;}
  void     SetDefaultFixParam();
  Bool_t   SetFixThisParam(Int_t thispar,Bool_t fixpar);
  void     SetFixGaussianMean(Double_t mean=1.865,Bool_t fixpar=kTRUE){SetInitialGaussianMean(mean); SetFixThisParam(fNFinalPars-2,fixpar);}
  void     SetFixGaussianSigma(Double_t sigma=0.012, Bool_t fixpar=kTRUE){SetInitialGaussianSigma(sigma); SetFixThisParam(fNFinalPars-1,fixpar);}

  //getters
  TH1F*    GetHistoClone() const; //return the histogram
  void     GetRangeFit(Double_t &minvalue, Double_t &maxvalue) const {minvalue=fminMass; maxvalue=fmaxMass;}
  Double_t GetMinRangeFit()const {return fminMass;}
  Double_t GetMaxRangeFit()const {return fmaxMass;}
  Int_t    GetBinN()       const {return fNbin;}
  void     GetFitPars(Float_t* pars) const;
  Int_t    GetNFinalPars() const {return fNFinalPars;}
  void     GetTypeOfFit(Bool_t &background, Int_t &typeb) const {background = fWithBkg; typeb = ftypeOfFit4Bkg;}
  Int_t    GetReflectionSigmaFactor() const {return ffactor;} 
  Double_t GetMean() const {return fMass;}
  Double_t GetMeanUncertainty() const {return fMassErr;}
  Double_t GetSigma()const {return fSigmaSgn;}
  Double_t GetSigmaUncertainty()const { return fSigmaSgnErr;}
  Double_t GetRawYield()const {return fRawYield;}
  Double_t GetRawYieldError()const {return fRawYieldErr;}
  Double_t GetChiSquare() const;
  Double_t GetReducedChiSquare() const;
  void     GetSideBandsBounds(Int_t& lb, Int_t& hb) const;
  Bool_t*  GetFixParam()const {return fFixPar;}
  Bool_t   GetFixThisParam(Int_t thispar)const;
  TVirtualPad* GetPad(Double_t nsigma=3,Int_t writeFitInfo=1)const;

  void     PrintParTitles() const;

  void     InitNtuParam(TString ntuname="ntupar"); // initialize TNtuple to store the parameters
  void     FillNtuParam(); //Fill the TNtuple with the current parameters
  TNtuple* GetNtuParam() const {return fntuParam;} // return the TNtuple
  TNtuple* NtuParamOneShot(TString ntuname="ntupar"); // the three functions above all together
  void     WriteHisto(TString path="./") const; // write the histogram
  void     WriteNtuple(TString path="./") const; // write the TNtuple
  void     WriteCanvas(TString userIDstring="",TString path="./",Double_t nsigma=3,Int_t writeFitInfo=1,Bool_t draw=kFALSE) const; //write the canvas in a root file
  void     DrawHere(TVirtualPad* pd,Double_t nsigma=3,Int_t writeFitInfo=1) const;
  void     DrawFit(Double_t nsigma=3) const;
  void     Reset();

  void     IntS(Float_t *valuewitherror) const;    // integral of signal given my the fit with error
  Double_t IntTot() const {return fhistoInvMass->Integral("width");}  // return total integral of the histogram
  void     Signal(Double_t nOfSigma,Double_t &signal,Double_t &errsignal) const; // signal in nsigma with error 
  void     Signal(Double_t min,Double_t max,Double_t &signal,Double_t &errsignal) const; // signal in (min, max) with error 
  void     Background(Double_t nOfSigma,Double_t &background,Double_t &errbackground) const; // backgournd in nsigma with error 
  void     Background(Double_t min,Double_t max,Double_t &background,Double_t &errbackground) const; // backgournd in (min, max) with error 
  void     Significance(Double_t nOfSigma,Double_t &significance,Double_t &errsignificance) const; // significance in nsigma with error 
  void     Significance(Double_t min,Double_t max,Double_t &significance,Double_t &errsignificance) const; // significance in (min, max) with error 

  Double_t FitFunction4MassDistr (Double_t* x, Double_t* par);
  Double_t FitFunction4Sgn (Double_t* x, Double_t* par);
  Double_t FitFunction4Bkg (Double_t* x, Double_t* par);
  Bool_t   MassFitter(Bool_t draw=kTRUE);
  Bool_t   RefitWithBkgOnly(Bool_t draw=kTRUE);
  void     RebinMass(Int_t bingroup=1);
  TF1*     GetBackgroundFullRangeFunc(){
    return fhistoInvMass->GetFunction("funcbkgFullRange");
  }
  TF1*     GetBackgroundRecalcFunc(){
    return fhistoInvMass->GetFunction("funcbkgRecalc");
  }
  TF1*     GetMassFunc(){
    return fhistoInvMass->GetFunction("funcmass");
  }
  void SetUseLikelihoodFit(){fFitOption="L,";}
  void SetUseLikelihoodWithWeightsFit(){fFitOption="WL,";}
  void SetUseChi2Fit(){fFitOption="";}

 private:

  void     PlotFit(TVirtualPad* pd,Double_t nsigma=3,Int_t writeFitInfo=1)const;

  void     ComputeParSize();
  void     ComputeNFinalPars();
  Bool_t   SideBandsBounds();
  Bool_t   CheckRangeFit();
  void     AddFunctionsToHisto();

  TH1F*     fhistoInvMass;     // histogram to fit
  Double_t  fminMass;          // lower mass limit
  Double_t  fmaxMass;          // upper mass limit
  Int_t     fminBinMass;       // bin corresponding to fminMass
  Int_t     fmaxBinMass;       // bin corresponding to fmaxMass
  Int_t     fNbin;             // number of bins
  Int_t     fParsSize;         // size of fFitPars array
  Int_t     fNFinalPars;       // number of parameters of the final function
  Float_t*  fFitPars;          //[fParsSize] array of fit parameters
  Bool_t    fWithBkg;          // signal+background (kTRUE) or signal only (kFALSE)
  Int_t     ftypeOfFit4Bkg;    // 0 = exponential; 1 = linear; 2 = pol2
  Int_t     ftypeOfFit4Sgn;    // 0 = gaus; 1 = gaus+gaus broadened
  Int_t     ffactor;           // number to multiply to the sigma of the signal to obtain the reflected gaussian
  TNtuple*  fntuParam;         // contains fit parameters
  Double_t  fMass;             // signal gaussian mean value
  Double_t  fMassErr;          // err signal gaussian mean value
  Double_t  fSigmaSgn;         // signal gaussian sigma
  Double_t  fSigmaSgnErr;      // err signal gaussian sigma
  Double_t  fRawYield;         // signal gaussian integral
  Double_t  fRawYieldErr;      // err on signal gaussian integral
  Bool_t    fSideBands;        // kTRUE = only side bands considered
  Bool_t*   fFixPar;           //[fNFinalPars] for each par if kTRUE it is fixed in fit
  Int_t     fSideBandl;        // left side band limit (bin number)
  Int_t     fSideBandr;        // right side band limit (bin number)
  Int_t     fcounter;          // internal counter
  TString   fFitOption;        // L, LW or Chi2
  TList*    fContourGraph;     // TList of TGraph containing contour plots

  ClassDef(AliHFMassFitter,8); // class for invariant mass fit
};

#endif