/**************************************************************************
 * 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.                  *
 **************************************************************************/
/**************************************************************************
 *                                                                        *
 * QA class of Heavy Flavor quark and fragmeted/decayed particles         *
 * -Check kinematics of Heavy Quarks/hadrons, and decayed leptons         *
 *    pT, rapidity                                                        *
 *    decay lepton kinematics w/wo acceptance                             *
 *    heavy hadron decay length, electron pT fraction carried from decay  *
 * -Check yield of Heavy Quarks/hadrons                                   *
 *    Number of produced heavy quark                                      *
 *    Number of produced hadron of given pdg code                         *
 *                                                                        *
 **************************************************************************/

#ifndef ALIHFEMCQA_H
#define ALIHFEMCQA_H

#ifndef ROOT_TObject
//#include <TObject.h>
#endif

class TH1F;
class TH2F;
class TParticle;
class TString;
class AliStack;

//________________________________________________________________
class AliHFEmcQA: public TObject {

        public: 
                enum heavyType {kCharm=4, kBeauty=5, kElectronPDG=11};
                enum qType {kQuark, kantiQuark, kHadron, keHadron, kDeHadron, kElectron, kElectron2nd};
                AliHFEmcQA();
                AliHFEmcQA(const AliHFEmcQA &p); // copy constructor
                AliHFEmcQA &operator=(const AliHFEmcQA &); // assignment operator

                virtual ~AliHFEmcQA();

                void PostAnalyze();
                void CreateHistograms(const Int_t kquark, Int_t icut, TString hnopt=""); // create histograms for mc qa analysis
                void SetStack(AliStack* const stack){fStack=stack;} // set stack pointer
                void Init();

                void GetQuarkKine(Int_t iTrack, const Int_t kquark); // get heavy quark kinematics distribution
                void GetHadronKine(Int_t iTrack, const Int_t kquark); // get heavy hadron kinematics distribution
                void GetDecayedKine(Int_t iTrack, const Int_t kquark, const Int_t kdecayed, Int_t icut, Bool_t isbarrel=kFALSE); // get decay electron kinematics distribution
                void EndOfEventAna(const Int_t kquark); // run analysis which should be done at the end of the event loop

        protected:
                void IdentifyMother(Int_t motherlabel, Int_t &motherpdg, Int_t &grandmotherlabel); // 
                void HardScattering(const Int_t kquark, Int_t &motherID, Int_t &mothertype, Int_t &motherlabel); // check if the quark is produced from hard scattering
                void ReportStrangeness(Int_t &motherID, Int_t &mothertype, Int_t &motherlabel); // report if the quark production process is unknown
                Bool_t IsFromInitialShower(Int_t inputmotherlabel, Int_t &motherID, Int_t &mothertype, Int_t &motherlabel); // check if the quark is produced from initial parton shower 
                Bool_t IsFromFinalParton(Int_t inputmotherlabel, Int_t &motherID, Int_t &mothertype, Int_t &motherlabel); // check if the quark is produced from final parton shower
                Float_t GetRapidity(TParticle *part); // return rapidity

                AliStack* fStack; // stack pointer           

                static const Int_t fgkGluon; // gluon pdg code
                static const Int_t fgkMaxGener; // ancester level wanted to be checked 
                static const Int_t fgkMaxIter; // number of iteration to find out matching particle 
                static const Int_t fgkqType; // number of particle type to be checked


                enum ProcessType
                        {
                        kPairCreationFromq,  kPairCreationFromg,  kFlavourExitation,  kGluonSplitting, kInitialPartonShower, kLightQuarkShower
                        };

                struct AliHists{
                        TH1F *fPdgCode; // histogram to store particle pdg code
                        TH1F *fPt; // histogram to store pt
                        TH1F *fY; // histogram to store rapidity
                        TH1F *fEta; // histogram to store eta

			AliHists()
			  : fPdgCode()
			  , fPt()
			  , fY()
			  , fEta()
                        {
			  // default constructor
			};
			AliHists(const AliHists & p)
			  : fPdgCode(p.fPdgCode)
			  , fPt(p.fPt)
			  , fY(p.fY)
			  , fEta(p.fEta)
                        {
			  // copy constructor
			};
			AliHists &operator=(const AliHists &)
			{
			  // assignment operator, not yet implemented 
			  return *this;
			}
                };
                struct AliHistsComm {
                        TH1F *fNq; // histogram to store number of quark
                        TH1F *fProcessID; // histogram to store process id 
                        TH2F *fePtRatio; // fraction of electron pT from D or B hadron
                        TH2F *fDePtRatio; // fraction of D electron pT from B hadron 
                        TH2F *feDistance; // distance between electron production point to mother particle 
                        TH2F *fDeDistance; // distance between D electron production point to mother particle

			AliHistsComm()
			  : fNq()
			  , fProcessID()
			  , fePtRatio()
			  , fDePtRatio()
			  , feDistance()
			  , fDeDistance()
                        {
			  // default constructor
			};
			AliHistsComm(const AliHistsComm & p)
			  : fNq(p.fNq)
			  , fProcessID(p.fProcessID)
			  , fePtRatio(p.fePtRatio)
			  , fDePtRatio(p.fDePtRatio)
			  , feDistance(p.feDistance)
			  , fDeDistance(p.fDeDistance)
                        {
			  // copy constructor
			};
			AliHistsComm &operator=(const AliHistsComm &)
			{
			  // assignment operator, not yet implemented 
			  return *this;
			}
                };

                AliHists fHist[2][7][5]; // struct of histograms to store kinematics of given particles
                AliHistsComm fHistComm[2][5]; // struct of additional histograms of given particles

                TParticle *fHeavyQuark[50]; // store pointer of heavy flavour quark 
                Int_t fIsHeavy[2]; // count of heavy flavour
                Int_t fNparents; // number of heavy hadrons to be considered
                Int_t fParentSelect[2][7]; // heavy hadron species


        ClassDef(AliHFEmcQA,0);
};

#endif