//Created by Christine Nattrass, Rebecca Scott, Irakli Martashvili
//University of Tennessee at Knoxville
//
// This class is designed for the analysis of the hadronic component of 
// transverse energy.  It is used by AliAnalysisTaskHadEt.
// This gets information about the hadronic component of the transverse energy 
// from tracks reconstructed in an event
// it has daughters, AliAnalysisHadEtMonteCarlo and 
// AliAnalysisHadEtReconstructed which loop over either Monte Carlo data or 
// real data to get Et

#include "AliAnalysisHadEt.h"
#include "TMath.h"
#include "TList.h"
#include "TH1F.h"
#include "TH2F.h"
#include <iostream>
#include "AliAnalysisEtCuts.h"
#include "AliMCEvent.h"
#include "AliVEvent.h"
#include "AliStack.h"
#include "AliESDtrackCuts.h"
#include "TDatabasePDG.h"
#include "TParticle.h"
#include "Rtypes.h"

using namespace std;

ClassImp(AliAnalysisHadEt);


Int_t AliAnalysisHadEt::fgnumOfEtaBins = 46;
Float_t AliAnalysisHadEt::fgEtaAxis[47]={-0.78, -0.74, -0.7, -0.66, -0.62, -0.58, -0.54, -0.5, -0.46, -0.42, -0.38, -0.34, -0.3, -0.26, -0.22, -0.18, -0.14, -0.12, -0.1, -0.08, -0.06, -0.04, -0.02, -0.0, 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.18, 0.22, 0.26, 0.3, 0.34, 0.38, 0.42, 0.46, 0.5, 0.54, 0.58, 0.62, 0.66, 0.7, 0.74, 0.78};
Int_t AliAnalysisHadEt::fgNumOfPtBins = 111;
Float_t AliAnalysisHadEt::fgPtAxis[117]=
  {0.0,0.01,0.02,0.03,0.04, 0.05, 0.06,0.07,0.08,0.09, 0.10,0.11, .12,0.13, .14,0.15, .16,0.17, .18,0.19,
   0.2, .22, .24, .26, .28, 0.30, 0.32, .34, .36, .38, 0.40, .42, .44, .46, .48,
   0.5, .52, .54, .56, .58, 0.60, 0.62, .64, .66, .68, 0.70, .72, .74, .76, .78,
   .80, .82, .84, .86, .88, 0.90, 0.92, .94, .96, .98, 1.00,1.05, 1.1,1.15, 1.2,
  1.25, 1.3,1.35,1.40,1.45, 1.50, 1.55, 1.6,1.65, 1.7, 1.75, 1.8,1.85, 1.9,1.95,
   2.0, 2.2, 2.4, 2.6, 2.8, 3.00, 3.20, 3.4, 3.6, 3.8, 4.00, 4.2, 4.4, 4.6, 4.8,
   5.0, 5.5, 6.0, 6.5, 7.0, 7.50, 8.00, 8.5, 9.0, 9.5, 10.0,12.0,14.0,16.0,18.0,
  20.0,25.0,30.0,35.0,40.0, 45.0, 50.0}; 

Float_t AliAnalysisHadEt::fgPtTPCCutOff = 0.15;
Float_t AliAnalysisHadEt::fgPtITSCutOff = 0.10;

AliAnalysisHadEt::AliAnalysisHadEt() :
        fHistogramNameSuffix("")
	,fCuts(0)
        ,fPdgDB(0)
        ,fPiPlusCode(0)
        ,fPiMinusCode(0)
        ,fKPlusCode(0)
        ,fKMinusCode(0)
        ,fProtonCode(0)
        ,fAntiProtonCode(0)
        ,fLambdaCode(0)
        ,fAntiLambdaCode(0)
        ,fK0SCode(0)
        ,fOmegaCode(0)
        ,fAntiOmegaCode(0)
        ,fXi0Code(0)
        ,fAntiXi0Code(0)
        ,fXiCode(0)
        ,fAntiXiCode(0)
        ,fSigmaCode(0)
        ,fAntiSigmaCode(0)
        ,fK0LCode(0)
        ,fNeutronCode(0)
        ,fAntiNeutronCode(0)
        ,fEPlusCode(0)
        ,fEMinusCode(0)
	,fGammaCode(0)
	,fPi0Code(0)
	,fEtaCode(0)
	,fOmega0Code(0)
        ,fPionMass(0)
        ,fKaonMass(0)
        ,fProtonMass(0)
        ,fElectronMass(0)
	,fSumEt(0)
	,fSumEtAcc(0)
	,fTotEt(0)
	,fTotEtAcc(0)
	,fTotNeutralEt(0)
	,fTotNeutralEtAcc(0)
	,fTotChargedEt(0)
	,fTotChargedEtAcc(0)
	,fMultiplicity(0)
	,fChargedMultiplicity(0)
	,fNeutralMultiplicity(0)
        ,fEsdtrackCutsITSTPC(0)
        ,fEsdtrackCutsTPC(0)
	,fEsdtrackCutsITS(0)
        ,fhistoList(0)
{//default constructor

}

AliAnalysisHadEt::~AliAnalysisHadEt()
{//destructor

}

Int_t AliAnalysisHadEt::AnalyseEvent(AliVEvent *event)
{ //this line is basically here to eliminate a compiler warning that event is not used.  Making it a virtual function did not work with the plugin.
  cout << "This event has " << event->GetNumberOfTracks() << " tracks" << endl;
  ResetEventValues();
  return 0;
}

void AliAnalysisHadEt::FillOutputList()
{//fill the output histogram list with histograms in all AliAnalysisHadEt's
}

void AliAnalysisHadEt::Init()
{// clear variables, set up cuts and PDG info
  ResetEventValues();

}

void AliAnalysisHadEt::CreateHistograms()
{//creates histograms included in all AliAnalysisHadEt's
}

void AliAnalysisHadEt::FillHistograms()
{//Fills histograms filled for all AliAnalysisHadEt's
}

void AliAnalysisHadEt::ResetEventValues()
{//Resets event values of et to zero
  fTotEt = 0;
  fTotEtAcc = 0;
  fTotNeutralEt = 0;
  fTotNeutralEtAcc = 0;
  fTotChargedEt  = 0;
  fTotChargedEtAcc = 0;
  fMultiplicity = 0;
  fChargedMultiplicity = 0;
  fNeutralMultiplicity = 0;
  
  if (!fCuts || !fPdgDB || fPiPlusCode==0) { // some Init's needed
    cout << __FILE__ << ":" << __LINE__ << " : Init " << endl;
    if (!fCuts) {
      cout << " setting up Cuts " << endl;
      fCuts = new AliAnalysisEtCuts();
    }
    if(!fPdgDB) {
      cout << " setting up PdgDB " << endl;
      fPdgDB = new TDatabasePDG();
    }
    
    if (fPiPlusCode==0) {
      SetParticleCodes();
    }
  }
}

void AliAnalysisHadEt::SetParticleCodes()
{  //the codes are defined in $ROOTSYS/etc/pdg_table.txt
    fPionMass = fPdgDB->GetParticle("pi+")->Mass();
    fKaonMass = fPdgDB->GetParticle("K+")->Mass();
    fProtonMass = fPdgDB->GetParticle("proton")->Mass();
    fElectronMass = fPdgDB->GetParticle("e+")->Mass();
    fPiPlusCode = fPdgDB->GetParticle("pi+")->PdgCode();
    fPiMinusCode = fPdgDB->GetParticle("pi-")->PdgCode();
    fKPlusCode = fPdgDB->GetParticle("K+")->PdgCode();
    fKMinusCode = fPdgDB->GetParticle("K-")->PdgCode();
    fProtonCode = fPdgDB->GetParticle("proton")->PdgCode();
    fAntiProtonCode = fPdgDB->GetParticle("antiproton")->PdgCode();
    fLambdaCode = fPdgDB->GetParticle("Lambda0")->PdgCode();
    fAntiLambdaCode = fPdgDB->GetParticle("Lambda0_bar")->PdgCode();
    fK0SCode = fPdgDB->GetParticle("K_S0")->PdgCode();
    fOmegaCode = fPdgDB->GetParticle("Omega-")->PdgCode();
    fAntiOmegaCode = fPdgDB->GetParticle("Omega+")->PdgCode();
    fXi0Code = fPdgDB->GetParticle("Xi0")->PdgCode();
    fAntiXi0Code = fPdgDB->GetParticle("Xi0_bar")->PdgCode();
    fXiCode = fPdgDB->GetParticle("Xi-")->PdgCode();
    fAntiXiCode = fPdgDB->GetParticle("Xi-_bar")->PdgCode();
    fSigmaCode = fPdgDB->GetParticle("Sigma-")->PdgCode();
    fAntiSigmaCode = fPdgDB->GetParticle("Sigma+")->PdgCode();
    fK0LCode = fPdgDB->GetParticle("K_L0")->PdgCode();
    fNeutronCode = fPdgDB->GetParticle("neutron")->PdgCode();
    fAntiNeutronCode = fPdgDB->GetParticle("antineutron")->PdgCode();
    fEPlusCode = fPdgDB->GetParticle("e+")->PdgCode();
    fEMinusCode = fPdgDB->GetParticle("e-")->PdgCode();
    fGammaCode =  fPdgDB->GetParticle("gamma")->PdgCode();
    fPi0Code =  fPdgDB->GetParticle("pi0")->PdgCode();
    fEtaCode =  fPdgDB->GetParticle("eta")->PdgCode();
    fOmega0Code =  fPdgDB->GetParticle("omega")->PdgCode();
    cout << "Resetting Codes: Pion " << fPiPlusCode
	 << "," << fPiMinusCode 
	 << " Kaon " << fKPlusCode 
	 << "," << fKMinusCode 
	 << " Gamma "<<fGammaCode
	 << " Pi0 "<<fPi0Code
	 << " Eta "<<fEtaCode
	 << " omega "<<fOmega0Code
	 << endl;
}

void AliAnalysisHadEt::CreateEtaPtHisto2D(TString name, TString title)
{     //creates a 2-d histogram in eta and phi and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();

  histoname->Append(name);
  histotitle->Append(title);
  //TH2F *h1 = new TH2F("h1", "Histogram with Gaussian random distribution", fgNumOfPtBins, ptBinsArray, fgnumOfEtaBins, etaBinsArray);

  TH2F *histo = new TH2F(histoname->Data(),histotitle->Data(),fgNumOfPtBins, fgPtAxis, fgnumOfEtaBins, fgEtaAxis);
  histo->SetYTitle("#eta");
  histo->SetXTitle("p_{T}");
  histo->SetZTitle("E_{T}");
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}

void AliAnalysisHadEt::CreateHisto1D(TString name, TString title, TString xtitle, TString ytitle,Int_t xbins, Float_t xlow,Float_t xhigh)
{     //creates a 1d histogram of the given dimensions and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();
  
  //cout<<"creating "<<name<<endl;

  histoname->Append(name);
  histotitle->Append(title);
  // printf("%s \n ",histoname->Data());
  TH1F *histo = new TH1F(histoname->Data(),histotitle->Data(),xbins,xlow,xhigh);
  histo->SetYTitle(ytitle);
  histo->SetXTitle(xtitle);
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}
void AliAnalysisHadEt::CreateIntHisto1D(TString name, TString title, TString xtitle, TString ytitle,Int_t xbins, Int_t xlow,Int_t xhigh)
{     //creates a 1d integer histogram and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();
  
  //cout<<"creating "<<name<<endl;

  histoname->Append(name);
  histotitle->Append(title);
  // printf("%s \n ",histoname->Data());
  TH1I *histo = new TH1I(histoname->Data(),histotitle->Data(),xbins,xlow,xhigh);
  histo->SetYTitle(ytitle);
  histo->SetXTitle(xtitle);
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}
void AliAnalysisHadEt::CreateHisto2D(TString name, TString title, TString xtitle, TString ytitle,Int_t xbins, Float_t xlow,Float_t xhigh,Int_t ybins,Float_t ylow,Float_t yhigh)
{     //creates a 2d histogram and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();
  
  //cout<<"creating "<<name<<endl;

  histoname->Append(name);
  histotitle->Append(title);
  // printf("%s \n ",histoname->Data());
  TH2F *histo = new TH2F(histoname->Data(),histotitle->Data(),xbins,xlow,xhigh,ybins,ylow,yhigh);
  histo->SetYTitle(ytitle);
  histo->SetXTitle(xtitle);
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}
void AliAnalysisHadEt::CreateIntHisto2D(TString name, TString title, TString xtitle, TString ytitle,Int_t xbins, Int_t xlow,Int_t xhigh,Int_t ybins,Int_t ylow,Int_t yhigh)
{     //creates a 2-d integer histogram and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();
  
  //cout<<"creating "<<name<<endl;

  histoname->Append(name);
  histotitle->Append(title);
  // printf("%s \n ",histoname->Data());
  TH2I *histo = new TH2I(histoname->Data(),histotitle->Data(),xbins,xlow,xhigh,ybins,ylow,yhigh);
  histo->SetYTitle(ytitle);
  histo->SetXTitle(xtitle);
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}

void AliAnalysisHadEt::CreateEtaHisto1D(TString name, TString title)
{     //creates 1d histogram in eta and adds it to the list of histograms to be saved
  TString *histoname   = new TString();
  TString *histotitle   = new TString();
  

  histoname->Append(name);
  histotitle->Append(title);
  TH1F *histo = new TH1F(histoname->Data(),histotitle->Data(),fgnumOfEtaBins, fgEtaAxis);
  histo->SetYTitle("E_{T}");
  histo->SetXTitle("#eta");
  histo->Sumw2();
  fhistoList->Add(histo);
  delete histoname;
  delete histotitle;
    
}
void AliAnalysisHadEt::FillHisto1D(TString histname, Float_t x, Float_t weight)
{//fills a 1d histogram with the name histoname with the value x and the weight "weight"
  TH1F     *histo; 
  TString  *name   = new TString();

  name->Append(histname);       
  histo = (TH1F *)fhistoList->FindObject(name->Data()); 
  if(histo){
    histo->Fill((Double_t)x, weight);
  }
  else{cerr<<"CorrelationMaker::FillHisto1D: no histogram "<< name->Data()<<endl;}
  delete name;
}
void AliAnalysisHadEt::FillHisto2D(TString histname, Float_t x, Float_t y, Float_t weight)
{//fills a 2d histogram with the name histoname with the value x and the weight "weight"
  TH2F     *histo; 
  TString  *name   = new TString();
  
  name->Append(histname);       
  histo = (TH2F *)fhistoList->FindObject(name->Data()); 
  if(histo){
    histo->Fill((Double_t)x,(Double_t)y, weight);
  }
  else{cerr<<"CorrelationMaker::FillHisto2D: no histogram "<< name->Data()<<endl;}
  delete name;
}


Float_t AliAnalysisHadEt::Et(TParticle *part, float mass){//function to calculate et in the same way as it would be calculated in a calorimeter
  if(mass+1000<0.01){//if no mass given return default.  The default argument is -1000
    if(TMath::Abs(part->GetPDG(0)->PdgCode())==2212 || TMath::Abs(part->GetPDG(0)->PdgCode())==2112){
      if(part->GetPDG(0)->PdgCode()==-2212 || part->GetPDG(0)->PdgCode()==-2112){//antiproton or antineutron
	//for antinucleons we specifically want to return the kinetic energy plus twice the rest mass
	return (part->Energy()+part->GetMass())*TMath::Sin(part->Theta());
      }
      if(part->GetPDG(0)->PdgCode()==2212 || part->GetPDG(0)->PdgCode()==2112){//antiproton or antineutron
	//for nucleons we specifically want to return the kinetic energy only
	return (part->Energy()-part->GetMass())*TMath::Sin(part->Theta());
      }
    }
    else{//otherwise go to the default
      return part->Energy()*TMath::Sin(part->Theta());
    }
  }
  else{//otherwise use the mass that was given
    return (TMath::Sqrt(TMath::Power(part->P(),2.0)+TMath::Power(mass,2.0)))*TMath::Sin(part->Theta());
  }
  return 0.0;
}
Float_t AliAnalysisHadEt::Et(Float_t p, Float_t theta, Int_t pid, Short_t charge){//function to calculate et in the same way as it would be calculated in a calorimeter
  if(pid==fPiPlusCode || pid==fPiMinusCode){//Nothing special for pions
    return TMath::Sqrt(p*p + fPionMass*fPionMass) * TMath::Sin(theta);
  }
  if(pid==fKPlusCode || pid==fKMinusCode){//Nothing special for kaons
    return TMath::Sqrt(p*p + fKaonMass*fKaonMass) * TMath::Sin(theta);
  }
  if(pid==fEPlusCode || pid==fEMinusCode){//Nothing special for electrons
    return TMath::Sqrt(p*p + fElectronMass*fElectronMass) * TMath::Sin(theta);
  }
  if(pid==fProtonCode || pid==fAntiProtonCode){//But for protons we must be careful...
    if(charge<0.0){//antiprotns: kinetic energy plus twice the rest mass
      return (TMath::Sqrt(p*p + fProtonMass*fProtonMass) + fProtonMass) * TMath::Sin(theta);
    }
    if(charge>0.0){//antiprotns: kinetic energy only
      return (TMath::Sqrt(p*p + fProtonMass*fProtonMass) - fProtonMass) * TMath::Sin(theta);
    }
  }
  cerr<<"Uh-oh!  Et not set properly!"<<endl;
  return 0.0;
}