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#include <iostream>
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#include <vector>
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#include "TFile.h"
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#include "TTree.h"
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#include "TChain.h"
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#include "TH1D.h"
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#include "TH2D.h"
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#include "TCanvas.h"
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#include "TProfile.h"
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#include "TNtuple.h"
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#include "TLegend.h"
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#include "TF1.h"
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#include "TGraphAsymmErrors.h"
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using namespace std;
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void PartonBiasedCentrality(double pttrig = 100, int etabin = 2, int nBins = 40){
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TFile* inf = new TFile("hydjet_b.root");
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TNtuple * nt = dynamic_cast<TNtuple*>(inf->Get("ana/nt"));
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TH1D* hB = new TH1D("hB",";b[fm];events",nBins,0,20);
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TH1D* hJet = new TH1D(Form("hJet%d",(int)pttrig),";b[fm];events",nBins,0,20);
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TH1D* hJetWeight = new TH1D(Form("hJetWeight%d",(int)pttrig),";b[fm];events",nBins,0,20);
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TH1D* hJetTrigger = new TH1D(Form("hJetTrigger%d",(int)pttrig),";b[fm];events",nBins,0,20);
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TH1D* hNhard = new TProfile("hNhard",";b[fm];N_{hard}",nBins,0,20);
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TF1 *fJetWeight = new TF1(Form("fJetWeight%d",(int)pttrig),"gaus",0,20);
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TF1 *fJetTrigger = new TF1(Form("fJetTrigger%d",(int)pttrig),"gaus",0,20);
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hJet->SetLineColor(4);
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hJetWeight->SetLineColor(4);
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hJetTrigger->SetLineColor(4);
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fJetWeight->SetLineColor(4);
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fJetTrigger->SetLineColor(4);
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nt->Draw("b>>hB","");
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nt->Draw("nhard:b>>hNhard","","prof");
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nt->Draw(Form("b>>%s",hJet->GetName()),Form("parton%d > %f",etabin,pttrig));
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hJetWeight->Add(hJet);
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hJetWeight->Divide(hB);
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hJetTrigger->Add(hJetWeight);
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int binmax = hJet->GetMaximumBin();
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int binmax2 = hJetWeight->GetMaximumBin();
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double jetWeightMax = hJetWeight->GetMaximum();
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hJet->Scale(hB->GetBinContent(binmax)/hJet->GetBinContent(binmax));
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hJetTrigger->Scale(hNhard->GetBinContent(binmax)/hJetTrigger->GetBinContent(binmax));
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hJetWeight->Scale(1./jetWeightMax);
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hJetWeight->Fit(fJetWeight);
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hJetTrigger->Fit(fJetTrigger);
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jetWeightMax = fJetWeight->GetMaximum();
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hJetWeight->Scale(1./jetWeightMax);
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hJetWeight->Fit(fJetWeight);
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// cout<<"Max 1 : "<<binmax<<" Max 2 : "<<binmax2<<endl;
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TLegend* leg1 = new TLegend(0.13,0.68,0.44,0.88,NULL,"brNDC");
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leg1->SetFillColor(0);
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leg1->SetTextSize(0.028);
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leg1->SetBorderSize(0);
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leg1->AddEntry(hB,Form("Min Bias b distribution"),"l");
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leg1->AddEntry(hJet,Form("Jet Biased b distribution"),"l");
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leg1->AddEntry(hB,Form("(Arbitrary Normalization)"),"");
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TLegend* leg2 = new TLegend(0.46,0.68,0.77,0.88,NULL,"brNDC");
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leg2->SetFillColor(0);
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leg2->SetTextSize(0.028);
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leg2->SetBorderSize(0);
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leg2->AddEntry(hNhard,Form("N_{hard} vs b"),"l");
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leg2->AddEntry(hJetTrigger,Form("p(b)^{Jet Bias} / p(b)^{Min Bias}"),"l");
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leg2->AddEntry(hNhard,Form("(Arbitrary Normalization)"),"");
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TCanvas* c1 = new TCanvas("c1","c1",400,400);
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hB->Draw();
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hJet->Draw("same");
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leg1->Draw();
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c1->Print(Form("impact_parameter_pt%d_nbins%d.gif",(int)pttrig,nBins));
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TCanvas* c2 = new TCanvas("c2","c2",400,400);
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hNhard->Draw("hist");
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hJetTrigger->Draw("same");
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leg2->Draw();
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c2->Print(Form("jet_bias_nhard_pt%d_nbins%d.gif",(int)pttrig,nBins));
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TCanvas* c3 = new TCanvas("c3","c3",400,400);
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hJetWeight->Draw("");
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c3->Print(Form("jet_bias_pt%d_nbins%d.gif",(int)pttrig,nBins));
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// Wrong, it also scales with f(b)
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// double eff = hJetWeight->Integral()/hJetWeight->GetNbinsX();
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double eff = hJet->Integral()/hB->Integral();
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// Report parameters
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cout<<"__________________________________"<<endl;
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cout<<"Using the Fit Function : "<<endl;
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cout<<fJetWeight->GetExpFormula()<<endl;
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cout<<"__________________________________"<<endl;
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cout<<"The parameters of the fit are : "<<endl;
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for(int ip = 0; ip < fJetWeight->GetNpar(); ++ip){
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cout<<fJetWeight->GetParameter(ip)<<",";
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}
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cout<<endl;
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cout<<"__________________________________"<<endl;
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cout<<"Expected Filter Efficiency : "<<endl;
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cout<<" "<<eff<<endl;
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cout<<endl;
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cout<<"__________________________________"<<endl;
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}
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