// ----------------------------------------------------------------------------
// $Id: sio_GoJets.C,v 1.4 2001/06/19 16:52:13 toshi Exp $
// ----------------------------------------------------------------------------
// $Log: sio_GoJets.C,v $
// Revision 1.4  2001/06/19 16:52:13  toshi
// Use gSystem->Getenv() to get Parfiles directory.
//
// Revision 1.3  2001/05/11 21:52:50  toshi
// Remove .so suffix from gSystem->Load("...") in order to call macros from
// Windows system.
//
// Revision 1.2  2001/05/09 22:07:18  toshi
// Add libSIO2root.so.
// Add $Id: sio_GoJets.C,v 1.4 2001/06/19 16:52:13 toshi Exp $.
//
//
// Read the output root file from FullRecon (SIO format).  
//
// Sample program using JetFinder           04/26/2001 Toshi
//
// :: How to run ::
// 
// 1) to call the root, type   
//    
//     root
//
// 2)
//     root [0]  .x sio_GoJets.C
// 
// .. that's it.
//
// For example, if you like to run 20 events, type like
//     root [0]  .x sio_GoJets.C(20)

Int_t sio_GoJets(Int_t nEvent=100)
{
  gROOT->Reset();

  TString parfile_dir;
  parfile_dir += gSystem->Getenv("LCDROOT")   ;parfile_dir += "/";
  parfile_dir += gSystem->Getenv("LCDVERSION");parfile_dir += "/";
  parfile_dir += "ParFiles/";

  // In order to refer to shareable libraries in this simple form,
  // include their paths in a .rootrc file.
  gSystem->Load("libLCDEvent");
  gSystem->Load("libLCDRootAppsUtil");
  gSystem->Load("libLCDFastMC");
  gSystem->Load("libLCDFullRecon");
  gSystem->Load("libLCDPhUtil");
  gSystem->Load("libSIO2root");
  gSystem->Load("libLCDSIOUtil");

  LCDEvent event;

  // Input Gismo full simulation file
  Char_t* sioFile  = "test_L2_pi0.sio";
  LCDreadSIOFile source(sioFile,&event);

  // Must use the same detector name as Full simulation
  Char_t* geomFile = 
    "Silicon.par"; //Silicon
  //"Large.par";   // Large
  //"Small.par";   // Small
  TString s_geomFile(parfile_dir);
  s_geomFile += geomFile;
  FILE* m_geomfile =  fopen(s_geomFile.Data(),"r");
  LCDGetParameters gp(m_geomfile);
  fclose(m_geomfile);

  Char_t* smearFile = 
    "lookup_silicon.nobmcon";
  //"lookup_large.nobmcon";
  //"lookup_small.nobmcon";
  TString s_smearFile(parfile_dir);
  s_smearFile += smearFile;

  // Setup FullRecon
  LCDFullRecon frec(&gp, s_smearFile.Data(), &event);

  // Define histograms
  TH1F *nJets   = new TH1F("nJets","# of Jets per Event (y=0.004)",20,0.,20);
  TH1F *nJets_1 = new TH1F("nJets_1","# of Jets per Event(y=0.006)",20,0.,20);
  TH1F *nJets_2 = new TH1F("nJets_2","# of Jets per Event(y=0.006, JADE)",20,0.,20);
  TH1F *JetP    = new TH1F("JetP","Jet momentum",100,0.,200);
  TH1F *JetPhi  = new TH1F("JetPhi","JetPhi Angle",100,0.,3.14);
  TH1F *JetCosTh= new TH1F("JetCosTh","Jet Cos Theta",50,-1.0,1.0);

  // Setup of JetFinder
  LCDJetFinder jetfind(0.004);  // Default.. DURHAM algorithm

  TClonesArray veclist("TLorentzVector",100);

  // Event loop
  Int_t iEvent;
  for (iEvent = 0; iEvent < nEvent; iEvent++) {
    if (!source.GetEvent()) break; //read Gismo full sim. data
    frec.Doit();                   //do full recon.

    // Look at tracks. Can access them by the [] operator.
    Int_t nTracks = event.Tracks()->GetEntries();

    //  Event cut # track >= 2
    if (nTracks < 2) continue;

    veclist.Delete(); // Clean up veclist

    //  Track loop    
    for (Int_t itrk=0 ; itr k <nTracks ; itrk++) {
      LCDTrack* trk = (LCDTrack*)event.Tracks()->At(itrk);

      TVector3 tP3(trk->GetMomentumVector(0.0));
      Double_t  E_trk = TMath::Sqrt(tP3.Mag2() + 0.1396*0.1396); 
      // Assume pion mass
      new(veclist[itrk]) TLorentzVector();
      TLorentzVector* tP4=(TLorentzVector*)veclist[itrk];
      tP4->SetXYZT(tP3.X(),tP3.Y(),tP3.Z(),E_trk);
    }
    

//  Do Jet Finding
    jetfind.SetPartList(&veclist); // Input particle 4-vector list
    jetfind.SetDURHAM();          // Use DURHAM algorithm
    jetfind.SetYCut(0.004);       // Set YCut value
    jetfind.doFindJets();         // JetFindig
    
    Int_t numjets = jetfind.njets();
    nJets->Fill(numjets);

    for(Int_t j = 0; j < numjets; j++){

      TLorentzVector* Jet_vec = jetfind.jet4vec(j);
      TVector3        Pjet    = Jet_vec->Vect();   // Jet 3 vector

      Double_t  Jet_mom = Pjet->Mag();
      Double_t  Jet_cos = (Pjet->Z())/Jet_mom;
      Double_t  Jet_phi = Pjet->Phi();

      JetP    ->Fill(Jet_mom);
      JetPhi  ->Fill(Jet_phi);
      JetCosTh->Fill(Jet_cos);
    }

//  Example 1  ... Do JetFindong with different Y-cut
    jetfind.SetYCut(0.0060);  // Set different YCut value
    jetfind.doFindJets();     // JetFinding

    Int_t numjets_1 = jetfind->njets();
    nJets_1->Fill(numjets_1);


//  Example 2  ... Do JetFindong with different Algorithm
    jetfind.SetJADE();      // Use JADE algorithm
    jetfind.doFindJets();    // JetFinding

    Int_t numjets_2 = jetfind->njets();
    nJets_2->Fill(numjets_2);

  }
  veclist.Delete();

  nJets   ->SetFillColor(4);
  nJets_1 ->SetFillColor(4);
  nJets_2 ->SetFillColor(4);
  JetP    ->SetFillColor(4);
  JetPhi  ->SetFillColor(4);
  JetCosTh->SetFillColor(4);

  TCanvas *c1 = new TCanvas("c1", "c1", 600,600);
  c1->Divide(2,3);
  c1->cd(1); nJets->Draw("B");
  c1->cd(2); nJets_1->Draw("B");
  c1->cd(3); nJets_2->Draw("B");
  c1->cd(4); JetP->Draw("B");
  c1->cd(5); JetPhi->Draw("B");
  c1->cd(6); JetCosTh->Draw("B");

  return iEvent;
}