#ifndef ALIEMCALGETTER_H
#define ALIEMCALGETTER_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

//_________________________________________________________________________
//  A singleton that returns various objects 
//  Should be used on the analysis stage to avoid confusing between different
//  branches of reconstruction tree: e.g. reading RecPoints and TS made from 
//  another set of RecPoints.
// 
//  The objects are retrived from folders.  
//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC KI & SUBATECH)
//    


// --- ROOT system ---
#include "TClonesArray.h"
#include "TFolder.h"  
#include "TTree.h"
class TString ;
class TParticle ;
class TTask ;

// --- Standard library ---
#include <stdlib.h>
#include <iostream.h>

// --- AliRoot header files ---

#include "AliRun.h"
#include "AliEMCALv1.h" 
#include "AliEMCALHit.h" 
#include "AliEMCALDigit.h" 
#include "AliEMCALDigitizer.h" 
#include "AliEMCALSDigitizer.h"
#include "AliEMCALTowerRecPoint.h"
class AliEMCALGeometry ;
class AliEMCALClusterizerv1 ;
//class AliEMCALTrackSegment ;
//class AliEMCALTrackSegmentMaker ;
//class AliEMCALRecParticle ;
//class AliEMCALPID ;

class AliEMCALGetter : public TObject {
  
 public:
  
  AliEMCALGetter(){ 
    // ctor: this is a singleton, the ctor should never be called but cint needs it as public
    cerr << "ERROR: AliPHOGetter is a singleton default ctor not callable" << endl ;
    abort() ; 
  } 
  AliEMCALGetter(const AliEMCALGetter & obj) {
    // cpy ctor requested by Coding Convention 
    // but not yet needed
    abort() ; 
  } 
  
  virtual ~AliEMCALGetter() ; 
  
  const Bool_t HasFailed(void) const {return fFailed ;} 
  Bool_t PostHits(void ) const ;  
  Bool_t PostSDigits(      const char * name,  const char * file = 0) const ;  
  Bool_t PostDigits(       const char * name ) const ;  
  Bool_t PostRecPoints(    const char * name ) const ;  
  //Bool_t PostTrackSegments(const char * name) const ;  
  //Bool_t PostRecParticles( const char * name) const ;  

  Bool_t PostClusterizer( const char * name) const ;  
  Bool_t PostClusterizer(AliEMCALClusterizerv1 * clu) const ;  
  Bool_t PostSDigitizer (AliEMCALSDigitizer * sdigitizer) const ;  
  Bool_t PostSDigitizer ( const char * name, const char * file ) const ;  
  Bool_t PostDigitizer (AliEMCALDigitizer * digitizer) const ;  
  Bool_t PostDigitizer  ( const char * name) const ;  
  //Bool_t PostTrackSegmentMaker(AliEMCALTrackSegmentMaker * tsm) const ;  
  //Bool_t PostTrackSegmentMaker(const char * name ) const ;  
  //Bool_t PostPID  (AliEMCALPID * pid) const ;  
  //Bool_t PostPID  (const char * name ) const ;  
  //Bool_t PostQA   (void) const ;
  

  void   Event(const Int_t event, const char * opt = "HSDR") ;    
  void   Track(Int_t itrack) ;

  //Method to be used when digitizing under AliRunDigitizer, who opens all files etc.
  void   ReadTreeS(TTree * treeS,Int_t input) ;
  
  Int_t  EventNumber()       { return (Int_t) gAlice->GetEvNumber() ; }
  Int_t  MaxEvent()          { return (Int_t) gAlice->TreeE()->GetEntries() ; }
  static AliEMCALGetter * GetInstance(const char* headerFile,
				     const char* branchTitle = "Default", const Option_t * rw="" ) ; 
  static AliEMCALGetter *   GetInstance() ; 

  const AliEMCALv1 *         EMCAL()  ;  
  AliEMCALGeometry * EMCALGeometry() ; 
   // Alarms
  //TFolder * Alarms() const { return (TFolder*)(ReturnO("Alarms", 0)) ; }
  //TObjArray *  Alarms(const char * name ) const { return (TObjArray*)(ReturnO("Alarms", name)) ; }

  // QA Tasks
  //TTask * QATasks(const char * name = 0) const { return (TTask*)(ReturnT("QATasks", name)) ; }

  // Primaries
  TClonesArray *  Primaries(void) const { return (TClonesArray*)(ReturnO("Primaries")) ; }
  
  
  // Hits
  const TClonesArray *  Hits(void) { return static_cast<const TClonesArray*>(ReturnO("Hits")) ; }
  const AliEMCALHit * Hit(Int_t index)  { return static_cast<const AliEMCALHit*>(Hits()->At(index) );}
  
  // SDigits
  TClonesArray *  SDigits(const char * name = 0, const char * file=0) { 
    return static_cast<TClonesArray*>(ReturnO("SDigits", name, file)) ; 
  }
  const AliEMCALDigit *  SDigit(Int_t index) { return static_cast<const AliEMCALDigit*>(SDigits()->At(index)) ;}
  
  AliEMCALSDigitizer *  SDigitizer(const char * name =0) const { 
    return ((AliEMCALSDigitizer*)(ReturnT("SDigitizer", name))) ; 
  }
 
  // Digits
   TClonesArray *  Digits(const char * name = 0)const  { 
    return static_cast<TClonesArray*>(ReturnO("Digits", name)) ; 
  }
  const AliEMCALDigit *  Digit(Int_t index) { return static_cast<const AliEMCALDigit *>(Digits()->At(index)) ;}
  AliEMCALDigitizer *  Digitizer(const char * name =0) const { 
    return (AliEMCALDigitizer*)(ReturnT("Digitizer", name)) ; 
  }

  //  RecPoints
  TObjArray * TowerRecPoints(const char * name = 0) const { 
    return (TObjArray*)(ReturnO("TowerRecPoints", name)) ; }
  TObjArray * PreShowerRecPoints(const char * name = 0) const { 
    return (TObjArray*)(ReturnO("PreShoRecPoints", name)) ; }
  const AliEMCALTowerRecPoint *  TowerRecPoint(Int_t index) { 
    return static_cast<const AliEMCALTowerRecPoint *>(TowerRecPoints()->At(index)) ;}
  const AliEMCALTowerRecPoint *  PreShowerRecPoint(Int_t index) { 
    return static_cast<const AliEMCALTowerRecPoint *>(PreShowerRecPoints()->At(index)) ;}

    AliEMCALClusterizerv1 * Clusterizer (const char * name =0) const { 
    return (AliEMCALClusterizerv1*)(ReturnT("Clusterizer", name)) ; }

  // TrackSegments
  //TClonesArray * TrackSegments(const char * name = 0) const 
   //                { return (TClonesArray*)(ReturnO("TrackSegments", name)) ; }
  //AliEMCALTrackSegmentMaker * TrackSegmentMaker (const char * name =0) const 
    //               { return (AliEMCALTrackSegmentMaker*)(ReturnT("TrackSegmentMaker", name)) ; }

  // RecParticles
  //TClonesArray * RecParticles(const char * name = 0) const  
    //               { return (TClonesArray*)(ReturnO("RecParticles", name)) ; }
    //AliEMCALPID * PID(const char * name =0) const 
      //             { return (AliEMCALPID*)(ReturnT("PID", name)) ; }

  // Primaries
  const TParticle *           Primary(Int_t index) const ;
  const Int_t                 NPrimaries()const { return fNPrimaries; }

  void  SetDebug(Int_t level) {fDebug = level;} // Set debug level

  AliEMCALGetter & operator = (const AliEMCALGetter & ) {
    // assignement operator requested by coding convention, but not needed
    abort() ;
    return *this ; 
  }
  
  TFolder * SDigitsFolder() { return dynamic_cast<TFolder*>(fSDigitsFolder->FindObject("EMCAL")) ; }

 private:

  AliEMCALGetter(const char* headerFile, const char* branchTitle ="Default", const Option_t * rw ="") ; 
  void CreateWhiteBoard() const ; 
  TObject * ReturnO(TString what, TString name=0, TString file=0) const ; 
  const TTask * ReturnT(TString what,TString name=0) const ; 
  void DefineBranchTitles(char* branch, char* branchTitle) ;
  void ReadTreeD() ;
  void ReadTreeH() ;
  void ReadTreeR() ;
  void ReadTreeS(Int_t event) ;
  //void ReadTreeQA() ;
  void ReadPrimaries() ;

  TObject ** HitsRef(void) const ;
  TObject ** SDigitsRef(const char * name, const char * file = 0 ) const;
  TObject ** DigitsRef (const char * name)   const ;
  TObject ** TowerRecPointsRef (const char * name) const ;
  TObject ** PreShoRecPointsRef (const char * name) const ;
  //TObject ** TrackSegmentsRef(const char * name)   const ;
  //TObject ** RecParticlesRef (const char * name)   const ;
  //TObject ** AlarmsRef (void)   const ;

  TObject ** SDigitizerRef (const char * name) const ; 
  TObject ** DigitizerRef  (const char * name) const ; 
  TObject ** ClusterizerRef(const char * name) const ; 
  //TObject ** TSMakerRef    (const char * name) const ; 
  //TObject ** PIDRef        (const char * name) const ; 

 private:

  static TFile *        fFile ;              //!
  TString        fHeaderFile ;        //! File in which gAlice lives
  TString        fBranchTitle ;       //!
  //TString        fTrackSegmentsTitle ;//! 
  TString        fRecPointsTitle ;    //!
  //TString        fRecParticlesTitle ; //!
  TString        fDigitsTitle ;       //!
  TString        fSDigitsTitle ;      //!

  Bool_t         fFailed ;            //! true if file is not opened and/or galice not found
  Int_t          fDebug ;             // Debug level

  Int_t          fNPrimaries ;        //! # of primaries
  
  TObjArray *    fPrimaries ;         //! list of lists of primaries-for the case of mixing

  TFolder *      fModuleFolder ;      //!Folder that contains the modules 
  TFolder *      fHitsFolder ;        //!Folder that contains the Hits 
  TFolder *      fSDigitsFolder ;     //!Folder that contains the SDigits 
  TFolder *      fDigitsFolder ;      //!Folder that contains the Digits 
  TFolder *      fRecoFolder ;        //!Folder that contains the reconstructed objects (RecPoints, TrackSegments, RecParticles) 
  //TFolder *      fQAFolder ;          //!Folder that contains the QA objects  
  TFolder *      fTasksFolder ;       //!Folder that contains the Tasks (sdigitizer, digitizer, reconstructioner)
 
  static AliEMCALGetter * fgObjGetter; // pointer to the unique instance of the singleton 

  ClassDef(AliEMCALGetter,1)  // Algorithm class that provides methods to retrieve objects from a list knowing the index 

};

#endif // AliEMCALGETTER_H