#ifndef ALIANALYSISTASKSELC2V0BACHELOR_H
#define ALIANALYSISTASKSELC2V0BACHELOR_H
/**************************************************************************
 * Copyright(c) 1998-2009, 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.                  *
 **************************************************************************/

/* $Id$ */ 

#include "TROOT.h"
#include "TSystem.h"

#include "AliAnalysisTaskSE.h"
#include "AliAODEvent.h"
#include "AliPID.h"
#include "AliAODTrack.h"
#include "AliRDHFCutsLctoV0.h"
#include "AliNormalizationCounter.h"

class TH1F;
class TClonesArray;
class AliAODRecoCascade;

class AliAnalysisTaskSELc2V0bachelor : public AliAnalysisTaskSE 
{
  
 public:
  
  AliAnalysisTaskSELc2V0bachelor();
  AliAnalysisTaskSELc2V0bachelor(const Char_t* name, AliRDHFCutsLctoV0* cuts,
				 Bool_t useOnTheFly=kFALSE, Bool_t writeVariableTree=kTRUE, Bool_t additionalChecks=kFALSE);
  virtual ~AliAnalysisTaskSELc2V0bachelor();

  // Implementation of interface methods  
  virtual void UserCreateOutputObjects();
  virtual void Init();
  virtual void LocalInit() {Init();}
  virtual void UserExec(Option_t *option);
  virtual void Terminate(Option_t *option);
 
  // histos
  void FillLc2pK0Sspectrum(AliAODRecoCascadeHF *part, Int_t isLc,
			   Int_t &nSelectedAnal, AliRDHFCutsLctoV0 *cutsAnal,
			   TClonesArray *mcArray);

  void MakeAnalysisForLc2prK0S(TClonesArray *arrayLctopK0S,
			       TClonesArray *mcArray,
			       Int_t &nSelectedAnal, AliRDHFCutsLctoV0 *cutsAnal);
 
  // set MC usage
  void SetMC(Bool_t theMCon) {fUseMCInfo = theMCon;}
  Bool_t GetMC() const {return fUseMCInfo;}

  // set flag for additional checks
  void SetAdditionalChecks(Bool_t additionalChecks) {fAdditionalChecks = additionalChecks;}
  Bool_t GetAdditionalChecks() const {return fAdditionalChecks;}

  void FillArmPodDistribution(AliAODv0 *vZero, TString histoTitle, TList *histoList);

  void SetK0SAnalysis(Bool_t a) {fIsK0SAnalysis=a;}
  Bool_t GetK0SAnalysis() const {return fIsK0SAnalysis;}

  void SetUseOnTheFlyV0(Bool_t a) { fUseOnTheFlyV0=a; }
  Bool_t GetUseOnTheFlyV0() { return fUseOnTheFlyV0; }

  Int_t MatchToMClabelC(AliAODRecoCascadeHF *candidate,TClonesArray *mcArray);

 private:
  
  void CheckEventSelection(AliAODEvent *aodEvent);
  void CheckEventSelectionWithCandidates(AliAODEvent *aodEvent);
  void CheckCandidatesAtDifferentLevels(AliAODRecoCascadeHF *part,AliRDHFCutsLctoV0* cutsAnal);
  void FillTheTree(AliAODRecoCascadeHF *part, AliRDHFCutsLctoV0 *cutsAnal, TClonesArray *mcArray, Int_t isLc);
  void DefineTreeVariables();

  Int_t MatchToMC(AliAODRecoCascadeHF *lc2bacV0,
		  Int_t *pdgDgLc2bacV0, Int_t *pdgDgV0,
		  TClonesArray *mcArray);

  Int_t SearchLcDaughter(TClonesArray *arrayMC, Int_t iii);

  void DefineGeneralHistograms();
  void DefineAnalysisHistograms();
  void DefineK0SHistos();
  void FillAnalysisHistograms(AliAODRecoCascadeHF *part, Bool_t isBachelorID, TString appendthis);

  AliAnalysisTaskSELc2V0bachelor(const AliAnalysisTaskSELc2V0bachelor &source);
  AliAnalysisTaskSELc2V0bachelor& operator=(const AliAnalysisTaskSELc2V0bachelor& source); 
  
  Double_t Det(Double_t a00,Double_t a01,
	       Double_t a10,Double_t a11) const;
  Double_t Det(Double_t a00,Double_t a01,Double_t a02,
	       Double_t a10,Double_t a11,Double_t a12,
	       Double_t a20,Double_t a21,Double_t a22) const;
  Double_t PropagateToDCA(AliAODv0 *v, AliAODTrack *bachelor, Double_t b,
			  Double_t &xVtxLc, Double_t &yVtxLc, Double_t &zVtxLc,
			  Double_t &pxVtxLc, Double_t &pyVtxLc, Double_t &pzVtxLc);

  Double_t GetAlpha(Double_t xyz[3],Double_t pxpypz[3]);

  Int_t SearchForCommonMother(TClonesArray *mcArray,
			      Int_t dgLabels[10],Int_t ndg,
			      Int_t &ndgCk, Int_t *pdgDg, Int_t &labelMother) const;

  Bool_t fUseMCInfo;          // Use MC info
  TList *fOutput;             // User output slot 1 // general histos
  TList *fOutputAll;          // User output slot 4 // histos without pid and cut on V0
  TList *fOutputPIDBach;      // User output slot 5 // histos with PID on Bachelor

  TH1F *fCEvents;                    // Histogram to check selected events
  Bool_t fIsK0SAnalysis;             // switch between Lpi and K0Sp
  AliNormalizationCounter *fCounter; // AliNormalizationCounter on output slot 2
  AliRDHFCutsLctoV0 *fAnalCuts;      // Cuts - sent to output slot 3
  //TList *fListCuts;                  // list of cuts
  Bool_t fUseOnTheFlyV0;             // flag to analyze also on-the-fly V0 candidates
  Bool_t fIsEventSelected;           // flag for event selected

  Bool_t    fWriteVariableTree;       // flag to decide whether to write the candidate variables on a tree variables
  TTree    *fVariablesTree;           //! tree of the candidate variables after track selection on output slot 4
  Float_t *fCandidateVariables;       //! variables to be written to the tree
  AliAODVertex *fVtx1;                // primary vertex
  Float_t fBzkG;                      // magnetic field value [kG]
  Bool_t fAdditionalChecks;           // flag to fill additional histograms

  ClassDef(AliAnalysisTaskSELc2V0bachelor,5); // class for Lc->p K0
};

#endif