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/*
 *  See header file for a description of this class.
 *
 *  $Date: 2010/01/04 14:46:10 $
 *  $Revision: 1.4 $
 *  \author S. Bolognesi, Eric - CERN
 */

#include "DQM/Physics/src/QcdHighPtDQM.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Common/interface/Handle.h"

#include "DQMServices/Core/interface/DQMStore.h"
#include "DQMServices/Core/interface/MonitorElement.h"
#include "FWCore/ServiceRegistry/interface/Service.h"

#include "DataFormats/METReco/interface/CaloMET.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <vector>

#include <string>
#include <cmath>

using namespace std;
using namespace edm;
using namespace reco;
using namespace math;


//Get Jets and MET (no MET plots yet pending converging w/JetMET group)

QcdHighPtDQM::QcdHighPtDQM(const ParameterSet& iConfig): 
  jetLabel_(iConfig.getUntrackedParameter<edm::InputTag>("jetTag")),
  metLabel1_(iConfig.getUntrackedParameter<edm::InputTag>("metTag1")),  
  metLabel2_(iConfig.getUntrackedParameter<edm::InputTag>("metTag2")),  
  metLabel3_(iConfig.getUntrackedParameter<edm::InputTag>("metTag3")),  
  metLabel4_(iConfig.getUntrackedParameter<edm::InputTag>("metTag4"))
{

}

QcdHighPtDQM::~QcdHighPtDQM() { 
  

}


void QcdHighPtDQM::beginJob() {
 
  theDbe = Service<DQMStore>().operator->();

  //Book MEs
 
  theDbe->setCurrentFolder("Physics/QcdHighPt");  

  MEcontainer_["dijet_mass"] = theDbe->book1D("dijet_mass", "dijet resonance invariant mass, barrel region", 100, 0, 1000);
  MEcontainer_["njets"] = theDbe->book1D("njets", "jet multiplicity", 10, 0, 10);
  MEcontainer_["etaphi"] = theDbe->book2D("etaphi", "eta/phi distribution", 83, -42, 42, 72, -M_PI, M_PI);
  MEcontainer_["njets30"] = theDbe->book1D("njets30", "jet multiplicity, pt > 30 GeV", 10, 0, 10);

  //book histograms for inclusive jet quantities
  MEcontainer_["inclusive_jet_pt"] = theDbe->book1D("inclusive_jet_pt", "inclusive jet Pt spectrum", 100, 0, 1000);
  MEcontainer_["inclusive_jet_pt_barrel"] = theDbe->book1D("inclusive_jet_pt_barrel", "inclusive jet Pt, eta < 1.3", 100, 0, 1000);
  MEcontainer_["inclusive_jet_pt_forward"] = theDbe->book1D("inclusive_jet_pt_forward", "inclusive jet Pt, 3.0 < eta < 5.0", 100, 0, 1000);
  MEcontainer_["inclusive_jet_pt_endcap"] = theDbe->book1D("inclusive_jet_pt_endcap", "inclusive jet Pt, 1.3 < eta < 3.0", 100, 0, 1000);

  //book histograms for leading jet quantities
  MEcontainer_["leading_jet_pt"] = theDbe->book1D("leading_jet_pt", "leading jet Pt", 100, 0, 1000);
  MEcontainer_["leading_jet_pt_barrel"] = theDbe->book1D("leading_jet_pt_barrel", "leading jet Pt, eta < 1.3", 100, 0, 1000);
  MEcontainer_["leading_jet_pt_forward"] = theDbe->book1D("leading_jet_pt_forward", "leading jet Pt, 3.0 < eta < 5.0", 100, 0, 1000);
  MEcontainer_["leading_jet_pt_endcap"] = theDbe->book1D("leading_jet_pt_endcap", "leading jet Pt, 1.3 < eta < 3.0", 100, 0, 1000);

  //book histograms for met over sum et and met over leading jet pt for various
  //flavors of MET
  MEcontainer_["movers_met"] = theDbe->book1D("movers_met", "MET over Sum ET for basic MET collection", 50, 0, 1);
  MEcontainer_["moverl_met"] = theDbe->book1D("moverl_met", "MET over leading jet Pt for basic MET collection", 50, 0, 2);
  
  MEcontainer_["movers_metho"] = theDbe->book1D("movers_metho", "MET over Sum ET for MET HO collection", 50, 0, 1);
  MEcontainer_["moverl_metho"] = theDbe->book1D("moverl_metho", "MET over leading jet Pt for MET HO collection", 50, 0, 2);
  
  MEcontainer_["movers_metnohf"] = theDbe->book1D("movers_metnohf", "MET over Sum ET for MET no HF collection", 50, 0, 1);
  MEcontainer_["moverl_metnohf"] = theDbe->book1D("moverl_metnohf", "MET over leading jet Pt for MET no HF collection", 50, 0, 2);

  MEcontainer_["movers_metnohfho"] = theDbe->book1D("movers_metnohfho", "MET over Sum ET for MET no HF HO collection", 50, 0, 1);
  MEcontainer_["moverl_metnohfho"] = theDbe->book1D("moverl_metnohfho", "MET over leading jet Pt for MET no HF HO collection", 50, 0, 2);

  //book histograms for EMF fraction for all jets and first 3 jets
  MEcontainer_["inclusive_jet_EMF"] = theDbe->book1D("inclusive_jet_EMF", "inclusive jet EMF", 50, -1, 1);
  MEcontainer_["leading_jet_EMF"] = theDbe->book1D("leading_jet_EMF", "leading jet EMF", 50, -1, 1);
  MEcontainer_["second_jet_EMF"] = theDbe->book1D("second_jet_EMF", "second jet EMF", 50, -1, 1);
  MEcontainer_["third_jet_EMF"] = theDbe->book1D("third_jet_EMF", "third jet EMF", 50, -1, 1);
  



}

void QcdHighPtDQM::endJob(void) {

}

// method to calculate MET over Sum ET from a particular MET collection
float QcdHighPtDQM::movers(const CaloMETCollection &metcollection) {

  float metovers = 0;
  CaloMETCollection::const_iterator met_iter;
  for(met_iter = metcollection.begin(); met_iter!= metcollection.end(); ++met_iter)
    {
      float mex = met_iter->momentum().x();
      float mey = met_iter->momentum().y();
      float met = sqrt(mex*mex+mey*mey);
      float sumet = met_iter->sumEt();
      metovers = (met / sumet);
    }
  return metovers;
}


// method to calculate MET over Leading jet PT for a particular MET collection
float QcdHighPtDQM::moverl(const CaloMETCollection &metcollection, float &ljpt) {
 float metoverl = 0;
 CaloMETCollection::const_iterator met_iter;
 for(met_iter = metcollection.begin(); met_iter!= metcollection.end(); ++met_iter)
   {
     float mex = met_iter->momentum().x();
     float mey = met_iter->momentum().y();
     float met = sqrt(mex*mex+mey*mey);
     metoverl = (met / ljpt);
   }
 return metoverl;
}


void QcdHighPtDQM::analyze(const Event& iEvent, const EventSetup& iSetup) {
  
  //Get Jets
  edm::Handle<CaloJetCollection> jetHandle;
  iEvent.getByLabel(jetLabel_,jetHandle);
  const CaloJetCollection & jets = *jetHandle;
  CaloJetCollection::const_iterator jet_iter;

  //Get MET collections
  edm::Handle<CaloMETCollection> metHandle;
  iEvent.getByLabel(metLabel1_, metHandle);
  const CaloMETCollection &met = *metHandle;

  edm::Handle<CaloMETCollection> metHOHandle;
  iEvent.getByLabel(metLabel2_, metHOHandle);
  const CaloMETCollection &metHO = *metHOHandle;
  
  edm::Handle<CaloMETCollection> metNoHFHandle;
  iEvent.getByLabel(metLabel3_, metNoHFHandle);
  const CaloMETCollection &metNoHF = *metNoHFHandle;

  edm::Handle<CaloMETCollection> metNoHFHOHandle;
  iEvent.getByLabel(metLabel4_, metNoHFHOHandle);
  const CaloMETCollection &metNoHFHO = *metNoHFHOHandle;

  //initialize leading jet value and jet multiplicity counter
  int njets = 0;
  int njets30 = 0;
  float leading_jetpt = 0;
  float leading_jeteta = 0;

  //initialize variables for picking out leading 2 barrel jets
  reco::CaloJet leadingbarreljet; 
  reco::CaloJet secondbarreljet;
  int nbarreljets = 0;

  //get bins in eta.  
  //Bins correspond to calotower regions.

  const float etabins[83] = {-5.191, -4.889, -4.716, -4.538, -4.363, -4.191, -4.013, -3.839, -3.664, -3.489, -3.314, -3.139, -2.964, -2.853, -2.650, -2.500, -2.322, -2.172, -2.043, -1.930, -1.830, -1.740, -1.653, -1.566, -1.479, -1.392, -1.305, -1.218, -1.131, -1.044, -.957, -.879, -.783, -.696, -.609, -.522, -.435, -.348, -.261, -.174, -.087, 0, .087, .174, .261, .348, .435, .522, .609, .696, .783, .879, .957, 1.044, 1.131, 1.218, 1.305, 1.392, 1.479, 1.566, 1.653, 1.740, 1.830, 1.930, 2.043, 2.172, 2.322, 2.500, 2.650, 2.853, 2.964, 3.139, 3.314, 3.489, 3.664, 3.839, 4.013, 4.191, 4.363, 4.538, 4.889, 5.191};

  for(jet_iter = jets.begin(); jet_iter!= jets.end(); ++jet_iter){
    njets++;
  
    //get Jet stats
    float jet_pt = jet_iter->pt();
    float jet_eta = jet_iter->eta();
    float jet_phi = jet_iter->phi();

    //fill jet Pt and jet EMF
    MEcontainer_["inclusive_jet_pt"]->Fill(jet_pt);
    MEcontainer_["inclusive_jet_EMF"]->Fill(jet_iter->emEnergyFraction());

    // pick out up to the first 2 leading barrel jets
    // for use in calculating dijet mass in barrel region
    // also fill jet Pt histogram for barrel

    if(jet_eta <= 1.3){
      MEcontainer_["inclusive_jet_pt_barrel"]->Fill(jet_pt);
      if(nbarreljets == 0){
        leadingbarreljet = jets[(njets-1)];
        nbarreljets++;
      }
      else if(nbarreljets == 1){
        secondbarreljet = jets[(njets-1)];
        nbarreljets++;
      }

    }

    // fill jet Pt for endcap and forward regions
    else if(jet_eta <= 3.0 && jet_eta > 1.3){MEcontainer_["inclusive_jet_pt_endcap"]->Fill(jet_pt);}

    else if(jet_eta <= 5.0 && jet_eta > 3.0){MEcontainer_["inclusive_jet_pt_forward"]->Fill(jet_pt);}


    // count jet multiplicity for jets with Pt > 30
    if((jet_pt) > 30) njets30++;

    // check leading jet quantities
    if(jet_pt > leading_jetpt){
      leading_jetpt = jet_pt;
      leading_jeteta = jet_eta;
    }

    //fill eta-phi plot
    for (int eit = 0; eit < 81; eit++){
      for(int pit = 0; pit < 72; pit++){
        float low_eta = etabins[eit];
        float high_eta = etabins[eit+1];
        float low_phi = (-M_PI) + pit*(M_PI/36);
        float high_phi = low_phi + (M_PI/36);
        if(jet_eta > low_eta && jet_eta < high_eta && jet_phi > low_phi && jet_phi < high_phi){
          MEcontainer_["etaphi"]->Fill((eit - 41), jet_phi);}


      }
    }
  }
  
  // after iterating over all jets, fill leading jet quantity histograms 
  // and jet multiplicity histograms

  MEcontainer_["leading_jet_pt"]->Fill(leading_jetpt);
  
  if(leading_jeteta <= 1.3){MEcontainer_["leading_jet_pt_barrel"]->Fill(leading_jetpt);}

  else if(leading_jeteta <= 3.0 && leading_jeteta > 1.3){MEcontainer_["leading_jet_pt_endcap"]->Fill(leading_jetpt);}

  else if(leading_jeteta <= 5.0 && leading_jeteta > 3.0){MEcontainer_["leading_jet_pt_forward"]->Fill(leading_jetpt);}

  MEcontainer_["njets"]->Fill(njets);

  MEcontainer_["njets30"]->Fill(njets30);

  // fill MET over Sum ET and Leading jet PT for all MET flavors
  MEcontainer_["movers_met"]->Fill(movers(met));
  MEcontainer_["moverl_met"]->Fill(movers(met), leading_jetpt);
  MEcontainer_["movers_metho"]->Fill(movers(metHO));
  MEcontainer_["moverl_metho"]->Fill(movers(metHO), leading_jetpt);
  MEcontainer_["movers_metnohf"]->Fill(movers(metNoHF));
  MEcontainer_["moverl_metnohf"]->Fill(movers(metNoHF), leading_jetpt);
  MEcontainer_["movers_metnohfho"]->Fill(movers(metNoHFHO));
  MEcontainer_["moverl_metnohfho"]->Fill(movers(metNoHFHO), leading_jetpt);
  

  // fetch first 3 jet EMF

  if(jets.size() >= 1){
    MEcontainer_["leading_jet_EMF"]->Fill(jets[0].emEnergyFraction());
    if(jets.size() >=2){
      MEcontainer_["second_jet_EMF"]->Fill(jets[1].emEnergyFraction());    
      if(jets.size() >= 3){
        MEcontainer_["third_jet_EMF"]->Fill(jets[2].emEnergyFraction());
      }
    }
  }

  // if 2 nontrivial barrel jets, reconstruct dijet mass

  if(nbarreljets == 2){
    if(leadingbarreljet.energy() > 0 && secondbarreljet.energy() > 0){
      math::XYZTLorentzVector DiJet = leadingbarreljet.p4() + secondbarreljet.p4();
      float dijet_mass = DiJet.mass();
        MEcontainer_["dijet_mass"]->Fill(dijet_mass);
    }
  }
      
    
}