#ifndef AliEmcalJet_H
#define AliEmcalJet_H

#include <vector>
#include <algorithm>
#include <utility>
#include <TArrayS.h>
#include <TLorentzVector.h>
#include <TMath.h>
#include <TClonesArray.h>
#include <TVector2.h>

#include "AliVParticle.h"
#include "AliVCluster.h"
#include "AliVEvent.h"

class AliEmcalJet : public AliVParticle
{
 public:
     enum EFlavourTag{
       kDStar = 1<<0,
       kD0 = 1<<1,
       kSig1 = 1<<2,
       kSig2 = 1<<3,
       kBckgrd1 = 1<<4,
       kBckgrd2 = 1<<5,
       kBckgrd3 = 1<<6
       //.....
    }; 
 
  AliEmcalJet();
  AliEmcalJet(Double_t px, Double_t py, Double_t pz);
  AliEmcalJet(Double_t pt, Double_t eta, Double_t phi, Double_t m);
  AliEmcalJet(const AliEmcalJet &jet); 
  AliEmcalJet& operator=(const AliEmcalJet &jet);

  Double_t          Px()                         const { return fPt*TMath::Cos(fPhi);  }
  Double_t          Py()                         const { return fPt*TMath::Sin(fPhi);  }
  Double_t          Pz()                         const { return fPt*TMath::SinH(fEta); }
  Double_t          Pt()                         const { return fPt;                   }
  Double_t          P()                          const { return fPt*TMath::CosH(fEta); }
  Bool_t            PxPyPz(Double_t p[3])        const { p[0]=Px();p[1]=Py();p[2]=Pz(); return 1;         }
  Double_t          Xv()                         const { return 0.;      }
  Double_t          Yv()                         const { return 0.;      }
  Double_t          Zv()                         const { return 0.;      }
  Bool_t            XvYvZv(Double_t x[3])        const { x[0]=0;x[1]=0;x[2]=0; return 1;                  }
  Double_t          OneOverPt()                  const { return 1./fPt;  }
  Double_t          Phi()                        const { return fPhi;    }
  Double_t          Theta()                      const { return 2*TMath::ATan(TMath::Exp(-fEta));         }
  Double_t          E()                          const { Double_t p=P(); return TMath::Sqrt(M()*M()+p*p); }
  Double_t          M()                          const { return fM; }
  Double_t          Eta()                        const { return fEta;    }
  Double_t          Y()                          const { return 0.5*TMath::Log((E()+Pz())/(E()-Pz()));    }
  Short_t           Charge()                     const { return 0;       }
  Int_t             GetLabel()                   const { return fLabel;  }
  Int_t             PdgCode()                    const { return 0;       }
  const Double_t   *PID()                        const { return 0;       }
  void              GetMom(TLorentzVector &vec)  const;
  void              Print(Option_t* option = "") const;

  Double_t          Area()                       const { return fArea;                     }
  Double_t          AreaPt()                     const { return fArea;                     }
  Double_t          AreaEta()                    const { return fAreaEta;                  }
  Double_t          AreaPhi()                    const { return fAreaPhi;                  }
  Double_t          AreaEmc()                    const { return fAreaEmc;                  }
  Bool_t            AxisInEmcal()                const { return fAxisInEmcal;              }
  Int_t             Compare(const TObject* obj)  const;
  Short_t           ClusterAt(Int_t idx)         const { return fClusterIDs.At(idx);       }
  AliVCluster      *ClusterAt(Int_t idx, TClonesArray *ca)  const { if (!ca) return 0; return dynamic_cast<AliVCluster*>(ca->At(ClusterAt(idx))); }
  AliVCluster      *GetLeadingCluster(TClonesArray *clusters) const;
  UShort_t          GetNumberOfClusters()        const { return fClusterIDs.GetSize();     }
  UShort_t          GetNumberOfTracks()          const { return fTrackIDs.GetSize();       }
  UShort_t          GetNumberOfConstituents()    const { return GetNumberOfClusters()+GetNumberOfTracks();       }
  Double_t          FracEmcalArea()              const { return fAreaEmc/fArea;            }
  Bool_t            IsInsideEmcal()              const { return (fAreaEmc/fArea>0.999);    }
  Bool_t            IsInEmcal()                  const { return (fAreaEmc>0);              }
  Bool_t            IsMC()                       const { return (Bool_t)(MCPt() > 0);      }
  Bool_t            IsSortable()                 const { return kTRUE;                     }
  Double_t          MaxNeutralPt()               const { return fMaxNPt;                   }
  Double_t          MaxChargedPt()               const { return fMaxCPt;                   }
  Double_t          NEF()                        const { return fNEF;                      }
  UShort_t          Nn()                         const { return fNn;                       }
  UShort_t          Nch()                        const { return fNch;                      }
  UShort_t          N()                          const { return Nch()+Nn();                }
  Int_t             NEmc()                       const { return fNEmc;                     }
  Double_t          MCPt()                       const { return fMCPt;                     }
  Double_t          MaxClusterPt()               const { return MaxNeutralPt();            }
  Double_t          MaxTrackPt()                 const { return MaxChargedPt();            }
  Double_t          MaxPartPt()                  const { return fMaxCPt < fMaxNPt ? fMaxNPt : fMaxCPt;     }
  Double_t          PtEmc()                      const { return fPtEmc;                    }
  Double_t          PtSub()                      const { return fPtSub;                    }
  Double_t          PtSub(Double_t rho)          const { return fPt - fArea*rho;           }
  Double_t          PtSubVect(Double_t rho)      const;
  Short_t           TrackAt(Int_t idx)           const { return fTrackIDs.At(idx);         }
  AliVParticle     *TrackAt(Int_t idx, TClonesArray *ta)  const { if (!ta) return 0; return dynamic_cast<AliVParticle*>(ta->At(TrackAt(idx))); } 
  AliVParticle     *GetLeadingTrack(TClonesArray *tracks) const;
  Int_t             GetFlavour()                 const { return fFlavourTagging;           } 
  
  void              AddClusterAt(Int_t clus, Int_t idx){ fClusterIDs.AddAt(clus, idx);     }
  void              AddFlavourTag(Int_t tag)           { fFlavourTagging |= tag; }
  void              AddTrackAt(Int_t track, Int_t idx) { fTrackIDs.AddAt(track, idx);      }
  void              Clear(Option_t */*option*/="")     { fClusterIDs.Set(0); fTrackIDs.Set(0); fClosestJets[0] = 0; fClosestJets[1] = 0; 
                                                         fClosestJetsDist[0] = 0; fClosestJetsDist[1] = 0; fMatched = 0; fPtSub = 0; }
  Double_t          DeltaR(const AliVParticle* part) const;

  void              SetLabel(Int_t l)                  { fLabel = l;                       }
  void              SetArea(Double_t a)                { fArea    = a;                     }
  void              SetAreaEta(Double_t a)             { fAreaEta = a;                     }
  void              SetAreaPhi(Double_t a)             { fAreaPhi = a;                     }
  void              SetAreaEmc(Double_t a)             { fAreaEmc = a;                     }
  void              SetAxisInEmcal(Bool_t b)           { fAxisInEmcal = b;                 }
  void              SetFlavour(Int_t flavour)          { fFlavourTagging = flavour;        }
  void              SetMaxNeutralPt(Double32_t t)      { fMaxNPt  = t;                     }
  void              SetMaxChargedPt(Double32_t t)      { fMaxCPt  = t;                     }
  void              SetNEF(Double_t nef)               { fNEF     = nef;                   }
  void              SetNumberOfClusters(Int_t n)       { fClusterIDs.Set(n);               }
  void              SetNumberOfTracks(Int_t n)         { fTrackIDs.Set(n);                 }
  void              SetNumberOfCharged(Int_t n)        { fNch = n;                         }
  void              SetNumberOfNeutrals(Int_t n)       { fNn = n;                          }
  void              SetMCPt(Double_t p)                { fMCPt = p;                        }
  void              SortConstituents();
  std::vector<int>  SortConstituentsPt(TClonesArray *tracks) const;
  void              SetNEmc(Int_t n)                   { fNEmc           = n;              }
  void              SetPtEmc(Double_t pt)              { fPtEmc          = pt;             }
  void              SetPtSub(Double_t ps)              { fPtSub          = ps;             } 
  void              SetPtSubVect(Double_t ps)          { fPtVectSub      = ps;             }
  Bool_t            TestFlavourTag(Int_t tag)          { return (Bool_t)((tag & fFlavourTagging) !=0); }

  // Trigger
  Bool_t            IsTriggerJet(UInt_t trigger=AliVEvent::kEMCEJE) const   { return (Bool_t)((fTriggers & trigger) != 0); }
  void              SetTrigger(UInt_t trigger)                              { fTriggers  = trigger;                        }
  void              AddTrigger(UInt_t trigger)                              { fTriggers |= trigger;                        }

  // Matching
  void              SetClosestJet(AliEmcalJet *j, Double_t d)       { fClosestJets[0] = j; fClosestJetsDist[0] = d    ; }
  void              SetSecondClosestJet(AliEmcalJet *j, Double_t d) { fClosestJets[1] = j; fClosestJetsDist[1] = d    ; }
  void              SetMatchedToClosest(UShort_t m)                 { fMatched        = 0; fMatchingType       = m    ; }
  void              SetMatchedToSecondClosest(UShort_t m)           { fMatched        = 1; fMatchingType       = m    ; }
  void              ResetMatching();
  AliEmcalJet*      ClosestJet()                              const { return fClosestJets[0]                          ; }
  Double_t          ClosestJetDistance()                      const { return fClosestJetsDist[0]                      ; }
  AliEmcalJet*      SecondClosestJet()                        const { return fClosestJets[1]                          ; }
  Double_t          SecondClosestJetDistance()                const { return fClosestJetsDist[1]                      ; }
  AliEmcalJet*      MatchedJet()                              const { return fMatched < 2 ? fClosestJets[fMatched] : 0; }
  UShort_t          GetMatchingType()                         const { return fMatchingType                            ; }

  void              SetTaggedJet(AliEmcalJet *j)                    { fTaggedJet = j                                  ; }
  void              SetTagStatus(Int_t i)                           { fTagStatus = i                                  ; }
  AliEmcalJet*      GetTaggedJet()                            const { return fTaggedJet                               ; }
  Int_t             GetTagStatus()                            const { return fTagStatus                               ; }

  //jet shape derivatives
  void              SetFirstDerivative(Double_t d)                  { fJetShapeMassFirstDer = d                       ; }
  void              SetSecondDerivative(Double_t d)                 { fJetShapeMassSecondDer = d                      ; }
  void              SetFirstOrderSubtracted(Double_t d)             { fJetShapeMassFirstSub = d                       ; }
  void              SetSecondOrderSubtracted(Double_t d)            { fJetShapeMassSecondSub = d                      ; }
  Double_t          GetFirstDerivative()                      const { return fJetShapeMassFirstDer                    ; }
  Double_t          GetSecondDerivative()                     const { return fJetShapeMassSecondDer                   ; }
  Double_t          GetFirstOrderSubtracted()                 const { return fJetShapeMassFirstSub                    ; }
  Double_t          GetSecondOrderSubtracted()                const { return fJetShapeMassSecondSub                   ; }

 protected:
  Double32_t        fPt;                  //[0,0,12]   pt 
  Double32_t        fEta;                 //[-1,1,12]  eta
  Double32_t        fPhi;                 //[0,6.3,12] phi
  Double32_t        fM;                   //[0,0,8]    mass
  Double32_t        fNEF;                 //[0,1,8]    neutral energy fraction
  Double32_t        fArea;                //[0,0,12]   area
  Double32_t        fAreaEta;             //[0,0,12]   area eta
  Double32_t        fAreaPhi;             //[0,0,12]   area phi
  Double32_t        fAreaEmc;             //[0,0,12]   area on EMCAL surface (determined from ghosts)
  Bool_t            fAxisInEmcal;         //           =true if jet axis inside EMCAL acceptance
  Int_t             fFlavourTagging;      // tag jet with a falvour, bit 0 = no tag; bit 1= Dstar; bit 2 = D0
  Double32_t        fMaxCPt;              //[0,0,12]   pt of maximum charged constituent
  Double32_t        fMaxNPt;              //[0,0,12]   pt of maximum neutral constituent
  Double32_t        fMCPt;                //           pt from MC particles contributing to the jet
  Int_t             fNn;                  //           number of neutral constituents
  Int_t             fNch;                 //           number of charged constituents
  Double32_t        fPtEmc;               //[0,0,12]   pt in EMCAL acceptance
  Int_t             fNEmc;                //           number of constituents in EMCAL acceptance
  TArrayI           fClusterIDs;          //           array containing ids of cluster constituents  
  TArrayI           fTrackIDs;            //           array containing ids of track constituents   
  AliEmcalJet      *fClosestJets[2];      //!          if this is MC it contains the two closest detector level jets in order of distance and viceversa
  Double32_t        fClosestJetsDist[2];  //!          distance to closest jets (see above)
  UShort_t          fMatched;             //!          0,1 if it is matched with one of the closest jets; 2 if it is not matched
  UShort_t          fMatchingType;        //!          matching type
  AliEmcalJet      *fTaggedJet;           //!          jet tagged to this jet
  Int_t             fTagStatus;           //!          status of tagging -1: NA 0: not tagged 1: tagged
  Double_t          fPtSub;               //!          background subtracted pt (not stored set from outside) 
  Double_t          fPtVectSub;           //!          background vector subtracted pt (not stored set from outside) 
  UInt_t            fTriggers;            //!          triggers that the jet might have fired (AliVEvent::EOfflineTriggerTypes)
  Double_t          fJetShapeMassFirstDer;  //!        result from shape derivatives for jet mass: 1st derivative
  Double_t          fJetShapeMassSecondDer; //!        result from shape derivatives for jet mass: 2nd derivative
  Double_t          fJetShapeMassFirstSub;  //!        result from shape derivatives for jet mass: 1st order subtracted
  Double_t          fJetShapeMassSecondSub; //!        result from shape derivatives for jet mass: 2nd order subtracted
  Int_t             fLabel;               //           label to inclusive jet for constituent subtracted jet    

  private:
    struct sort_descend
        { // sort in decreasing order
          // first value of the pair is Pt and the second is entry index
        bool operator () (const std::pair<Double_t, Int_t>& p1, const std::pair<Double_t, Int_t>& p2)  { return p1.first > p2.first ; }
        };

  ClassDef(AliEmcalJet,14) // Emcal jet class in cylindrical coordinates
};
#endif