/*************************************************************************
 * 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.                  *
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________
// This is a TTask that makes SDigits out of Hits
// A Summable Digits is the sum of all hits originating 
// from one in one tower of the EMCAL 
// A threshold for assignment of the primary to SDigit is applied 
// SDigits are written to TreeS, branch "EMCAL"
// AliEMCALSDigitizer with all current parameters is written 
// to TreeS branch "AliEMCALSDigitizer".
// Both branches have the same title. If necessary one can produce 
// another set of SDigits with different parameters. Two versions
// can be distunguished using titles of the branches.
// User case:
// root [0] AliEMCALSDigitizer * s = new AliEMCALSDigitizer("galice.root")
// Warning in <TDatabasePDG::TDatabasePDG>: object already instantiated
// root [1] s->ExecuteTask()
//             // Makes SDigitis for all events stored in galice.root
// root [2] s->SetPedestalParameter(0.001)
//             // One can change parameters of digitization
// root [3] s->SetSDigitsBranch("Redestal 0.001")
//             // and write them into the new branch
// root [4] s->ExeciteTask("deb all tim")
//             // available parameters:
//             deb - print # of produced SDigitis
//             deb all  - print # and list of produced SDigits
//             tim - print benchmarking information
//
//*-- Author : Sahal Yacoob (LBL)
// based on  : AliPHOSSDigitzer 
//////////////////////////////////////////////////////////////////////////////


// --- ROOT system ---
#include "TFile.h"
#include "TTask.h"
#include "TTree.h"
#include "TSystem.h"
#include "TROOT.h"
#include "TFolder.h"
#include "TBenchmark.h"
// --- Standard library ---
#include <iomanip.h>

// --- AliRoot header files ---
#include "AliRun.h"
#include "AliEMCALDigit.h"
#include "AliEMCALHit.h"
#include "AliEMCALSDigitizer.h"
#include "AliEMCALGeometry.h"
#include "AliEMCALv1.h"
#include "AliEMCALGetter.h"

ClassImp(AliEMCALSDigitizer)

           
//____________________________________________________________________________ 
  AliEMCALSDigitizer::AliEMCALSDigitizer():TTask("AliEMCALSDigitizer","") 
{
  // ctor
  fA = 0;
  fB = 0. ;
  fPrimThreshold = 0. ;
  fNevents = 0 ;     
  fSDigits = 0 ;
  fHits = 0 ;
  fLayerRatio = 0. ;
  fIsInitialized = kFALSE ;

}

//____________________________________________________________________________ 
AliEMCALSDigitizer::AliEMCALSDigitizer(const char* headerFile, const char *sDigitsTitle):TTask(sDigitsTitle, headerFile)
{
  // ctor
  fA = 0;
  fB = 10000000.;
  fPrimThreshold = 0.01 ;
  fNevents = 0 ; 
  fLayerRatio = 5./6. ;
  Init();
}

//____________________________________________________________________________ 
AliEMCALSDigitizer::~AliEMCALSDigitizer()
{
  // dtor
  if(fSDigits)
    delete fSDigits ;
  if(fHits)
    delete fHits ;
}
//____________________________________________________________________________ 
void AliEMCALSDigitizer::Init(){

  // Initialization: open root-file, allocate arrays for hits and sdigits,
  // attach task SDigitizer to the list of PHOS tasks
  // 
  // Initialization can not be done in the default constructor
  //============================================================= YS
  //  The initialisation is now done by the getter

if( strcmp(GetTitle(), "") == 0 )
    SetTitle("galice.root") ;
  
  AliEMCALGetter * gime = AliEMCALGetter::GetInstance(GetTitle(), GetName(), "update") ;     
  if ( gime == 0 ) {
    cerr << "ERROR: AliEMCALSDigitizer::Init -> Could not obtain the Getter object !" << endl ; 
    return ;
  } 
  
  gime->PostSDigits( GetName(), GetTitle() ) ; 

  TString sdname(GetName() );
  sdname.Append(":") ;
  sdname.Append(GetTitle() ) ;
  SetName(sdname) ;
  gime->PostSDigitizer(this) ;
 
  // create a folder on the white board //YSAlice/WhiteBoard/SDigits/EMCAL/headerFile/sdigitsTitle
 
 }
//____________________________________________________________________________
void AliEMCALSDigitizer::Exec(Option_t *option) { 

// Collects all hits in the same active volume into digit
 
  if( strcmp(GetName(), "") == 0 )
    Init() ;
  
  if (strstr(option, "print") ) {
    Print("") ; 
    return ; 
  }
  
  if(strstr(option,"tim"))
    gBenchmark->Start("EMCALSDigitizer");
  //Check, if this branch already exits
  gAlice->GetEvent(0) ;
  if(gAlice->TreeS() ) {
    TObjArray * lob = static_cast<TObjArray*>(gAlice->TreeS()->GetListOfBranches()) ;
    TIter next(lob) ; 
    TBranch * branch = 0 ;  
    Bool_t emcalfound = kFALSE, sdigitizerfound = kFALSE ; 
    
    while ( (branch = (static_cast<TBranch*>(next()))) && (!emcalfound || !sdigitizerfound) ) {
      if ( (strcmp(branch->GetName(), "EMCAL")==0) && (strcmp(branch->GetTitle(), GetName())==0) ) 
	emcalfound = kTRUE ;
      
      else if ( (strcmp(branch->GetName(), "AliEMCALSDigitizer")==0) && (strcmp(branch->GetTitle(), GetName())==0) ) 
	sdigitizerfound = kTRUE ; 
    }
    
    if ( emcalfound || sdigitizerfound ) {
      cerr << "WARNING: AliEMCALSDigitizer::Exec -> SDigits and/or SDigitizer branch with name " << GetName() 
	   << " already exits" << endl ;
      return ; 
    }   
  }  
  TString sdname(GetName()) ;
  sdname.Remove(sdname.Index(GetTitle())-1) ;
  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ;  
  Int_t nevents = (Int_t) gAlice->TreeE()->GetEntries() ; 
  
  Int_t ievent ;
  for(ievent = 0; ievent < nevents; ievent++){
    gime->Event(ievent,"H") ;
    const TClonesArray * fHits = gime->Hits() ;
    TClonesArray * sdigits = gime->SDigits(sdname.Data()) ;
    sdigits->Clear();
    Int_t nSdigits = 0 ;

  //Collects all hits in the same active volume into digit
  
  
    
    
    //Now made SDigits from hits, for EMCAL it is the same, so just copy    
    //  Int_t itrack ;
    // for (itrack=0; itrack < gAlice->GetNtrack(); itrack++){
    //gime->Track(itrack);  
      //=========== Get the EMCAL branch from Hits Tree for the Primary track itrack
      
      

 
      Int_t i;
      for ( i = 0 ; i < fHits->GetEntries() ; i++ ) { // loop over all hits (hit = deposited energy/layer/entering particle)
	AliEMCALHit * hit = dynamic_cast<AliEMCALHit*>(fHits->At(i)) ;
        AliEMCALDigit * curSDigit = 0 ;
        AliEMCALDigit * sdigit = 0 ;
        Bool_t newsdigit = kTRUE; 

	// Assign primary number only if deposited energy is significant
	  
	Float_t preShowerFactor ;
	if (hit->IsInPreShower() ) 
	  preShowerFactor = fLayerRatio ; 
	else 
	  preShowerFactor = 1 ; 
	
	if( hit->GetEnergy() > fPrimThreshold)
	  curSDigit =  new AliEMCALDigit( hit->GetPrimary(),
					  hit->GetIparent(),Layer2TowerID(hit->GetId(),hit->IsInPreShower()), 
					  Digitize( hit->GetEnergy() * preShowerFactor ) , 
					  hit->GetTime()) ;
        else
	  curSDigit =  new AliEMCALDigit( -1               , 
					  -1               ,
					  Layer2TowerID(hit->GetId(),hit->IsInPreShower()), 
					  Digitize( hit->GetEnergy() * preShowerFactor ) , 
					  hit->GetTime() ) ;	
	Int_t check = 0 ;
	for(check= 0; check < nSdigits ; check++) {
          sdigit = (AliEMCALDigit *)sdigits->At(check);
          if( sdigit->GetId() == curSDigit->GetId()) { // Are we in the same tower or the same preshower ?              
	      *sdigit = *sdigit + *curSDigit;
   
	      newsdigit = kFALSE;
	  }
	}
	if (newsdigit) { 
	  new((*sdigits)[nSdigits])  AliEMCALDigit(*curSDigit);
	  nSdigits++ ;  
	}
      }  // loop over all hits (hit = deposited energy/layer/entering particle)
      //    } // loop over tracks
      
      sdigits->Sort() ;
      
      nSdigits = sdigits->GetEntriesFast() ;
      sdigits->Expand(nSdigits) ;
      
      //  Int_t i ;
     const AliEMCALGeometry * geom = gime->EMCALGeometry() ; 
     
     Int_t lastPreShowerIndex = nSdigits - 1 ; 
     Int_t firstPreShowerIndex = -1 ; 
     Int_t index ; 
     AliEMCALDigit * sdigit = 0 ;
     for ( index = 0; index < nSdigits ; index++) {
       sdigit = dynamic_cast<AliEMCALDigit *>(sdigits->At(index) ) ;
       if (sdigit->IsInPreShower() ){ 
	 firstPreShowerIndex = index ;
	 break ;
       }
     }
     
    AliEMCALDigit * preshower ;
    AliEMCALDigit * tower ;
    Int_t lastIndex = lastPreShowerIndex +1 ; 


    for (index = firstPreShowerIndex ; index <= lastPreShowerIndex; index++) {
      preshower = dynamic_cast<AliEMCALDigit *>(sdigits->At(index) ); 
      Bool_t towerFound = kFALSE ;
      Int_t jndex ; 
      for (jndex = 0; jndex < firstPreShowerIndex; jndex++) {
	tower  = dynamic_cast<AliEMCALDigit *>(sdigits->At(jndex) ); 
	if ( (preshower->GetId() - (geom->GetNZ() * geom->GetNPhi()) ) == tower->GetId() ) {
	  *tower = *tower + *preshower ; // and add preshower to tower
	  towerFound = kTRUE ;
	}
      }
      if ( !towerFound ) { 

	new((*sdigits)[lastIndex])  AliEMCALDigit(*preshower);
	AliEMCALDigit * temp = dynamic_cast<AliEMCALDigit *>(sdigits->At(lastIndex)) ;
	temp->SetId(temp->GetId() - (geom->GetNZ() * geom->GetNPhi()) ) ;
	lastIndex++ ; 
      }
    }

    sdigits->Sort() ;
     for (i = 0 ; i < sdigits->GetEntriesFast() ; i++) { 
	sdigit->SetIndexInList(i) ;     
      }
      
      if(gAlice->TreeS() == 0)
	gAlice->MakeTree("S") ;
      
      
      
      
      //Make (if necessary) branches    
      char * file =0;
      if(gSystem->Getenv("CONFIG_SPLIT_FILE")){ //generating file name
	file = new char[strlen(gAlice->GetBaseFile())+20] ;
	sprintf(file,"%s/EMCAL.SDigits.root",gAlice->GetBaseFile()) ;
      }
      
      TDirectory *cwd = gDirectory;
      
      //First list of sdigits
      Int_t bufferSize = 32000 ;    
      TBranch * sdigitsBranch = gAlice->TreeS()->Branch("EMCAL",&sdigits,bufferSize);
      sdigitsBranch->SetTitle(sdname);
      cout << " AliEMCALSDigitizer::Exec sdname " << sdname << endl ; 
      
      if (file) {
	sdigitsBranch->SetFile(file);
	TIter next( sdigitsBranch->GetListOfBranches());
	TBranch * subbr;
	while ((subbr=(TBranch*)next())) {
	  subbr->SetFile(file);
	}   
	cwd->cd();
      } 
      
      //second - SDigitizer
      Int_t splitlevel = 0 ;
      AliEMCALSDigitizer * sd = this ;
      TBranch * sdigitizerBranch = gAlice->TreeS()->Branch("AliEMCALSDigitizer","AliEMCALSDigitizer",
							   &sd,bufferSize,splitlevel); 
      sdigitizerBranch->SetTitle(sdname);
      if (file) {
	sdigitizerBranch->SetFile(file);
	TIter next( sdigitizerBranch->GetListOfBranches());
	TBranch * subbr ;
	while ((subbr=(TBranch*)next())) {
	  subbr->SetFile(file);
	}   
	cwd->cd();
	delete file;
      }
      
      sdigitsBranch->Fill() ;
      sdigitizerBranch->Fill() ;
      gAlice->TreeS()->Write(0,TObject::kOverwrite) ;
      
      if(strstr(option,"deb"))
	PrintSDigits(option) ;
      
  }
  
  if(strstr(option,"tim")){
    gBenchmark->Stop("EMCALSDigitizer");
    cout << "AliEMCALSDigitizer:" << endl ;
    cout << "   took " << gBenchmark->GetCpuTime("EMCALSDigitizer") << " seconds for SDigitizing " 
	 <<  gBenchmark->GetCpuTime("EMCALSDigitizer")/fNevents << " seconds per event " << endl ;
    cout << endl ;
  }
  
  
}
//__________________________________________________________________
void AliEMCALSDigitizer::SetSDigitsBranch(const char * title ){
 
  // Setting title to branch SDigits 

  TString stitle(title) ;

  // check if branch with title already exists
  TBranch * sdigitsBranch    = 
    static_cast<TBranch*>(gAlice->TreeS()->GetListOfBranches()->FindObject("EMCAL")) ; 
  TBranch * sdigitizerBranch =  
    static_cast<TBranch*>(gAlice->TreeS()->GetListOfBranches()->FindObject("AliEMCALSDigitizer")) ;
  const char * sdigitsTitle    = sdigitsBranch ->GetTitle() ;  
  const char * sdigitizerTitle = sdigitizerBranch ->GetTitle() ;
  if ( stitle.CompareTo(sdigitsTitle)==0 || stitle.CompareTo(sdigitizerTitle)==0 ){
    cerr << "ERROR: AliEMCALSdigitizer::SetSDigitsBranch -> Cannot overwrite existing branch with title " << title << endl ;
    return ;
  }
  
  cout << "AliEMCALSdigitizer::SetSDigitsBranch -> Changing SDigits file from " << GetName() << " to " << title << endl ;

  SetName(title) ; 
    
  // Post to the WhiteBoard
  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ; 
  gime->PostSDigits( title, GetTitle()) ; 


}
//__________________________________________________________________
void AliEMCALSDigitizer::Print(Option_t* option)const{
  cout << "------------------- "<< GetName() << " -------------" << endl ;
  cout << "   Writing SDigitis to branch with title  " << GetName() << endl ;
  cout << "   with digitization parameters  A = " << fA << endl ;
  cout << "                                 B = " << fB << endl ;
  cout << "   Threshold for Primary assignment= " << fPrimThreshold << endl ; 
  cout << "---------------------------------------------------"<<endl ;
  
}
//__________________________________________________________________
Bool_t AliEMCALSDigitizer::operator==( AliEMCALSDigitizer const &sd )const{
  if( (fA==sd.fA)&&(fB==sd.fB)&&(fPrimThreshold==sd.fPrimThreshold))
    return kTRUE ;
  else
    return kFALSE ;
}
//__________________________________________________________________
void AliEMCALSDigitizer::PrintSDigits(Option_t * option){
  //Prints list of digits produced at the current pass of AliEMCALDigitizer
  
  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ; 
  TString sdname(GetName()) ;
  sdname.Remove(sdname.Index(GetTitle())-1) ;
  const TClonesArray * sdigits = gime->SDigits(sdname.Data()) ; 
  
  cout << "AliEMCALSDigitiser: event " << gAlice->GetEvNumber() << endl ;
  cout << "      Number of entries in SDigits list " << sdigits->GetEntriesFast() << endl ;
  cout << endl ;
  if(strstr(option,"all")||strstr(option,"EMC")){

    //loop over digits
    AliEMCALDigit * digit;
    cout << "SDigit Id " << " Amplitude " <<  "     Time " << "     Index "  <<  " Nprim " << " Primaries list " <<  endl;    
    Int_t index ;
    for (index = 0 ; index < sdigits->GetEntries() ; index++) {
      digit = (AliEMCALDigit * )  sdigits->At(index) ;
      cout << setw(6)  <<  digit->GetId() << "   "  << 	setw(10)  <<  digit->GetAmp() <<   "    "  << digit->GetTime()
	   << setw(6)  <<  digit->GetIndexInList() << "    "   
	   << setw(5)  <<  digit->GetNprimary() <<"    ";
      
      Int_t iprimary;
      for (iprimary=0; iprimary<digit->GetNprimary(); iprimary++)
	cout << " "  <<  digit->GetPrimary(iprimary+1) << "  ";
      cout << endl;  	 
    }
    cout <<endl;
  }
}
//________________________________________________________________________
Int_t AliEMCALSDigitizer::Layer2TowerID(Int_t s, Bool_t preshower)
{
  AliEMCALGetter * gime = AliEMCALGetter::GetInstance() ;
  const AliEMCALGeometry * geom = gime->EMCALGeometry();
  Int_t a  = (s/geom->GetNPhi())%geom->GetNZ()+1; // Phi Tower Index
  Int_t b = (s-1)%(geom->GetNPhi())+1; //Eta Tower Index
  Int_t t = -10;

if (a > 0 && b > 0)
{
  t = a*b + preshower*geom->GetNPhi()*geom->GetNZ();
  return t;
}
else
{cerr << " AliEMCALSDigitizer::Layer2TowerID() -- there is an error "<< endl << "Phi number = "
      << b << "Eta number = " << a << endl ;
return t;}
}