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// $Id: TrackingAction.cc 81501 2014-05-31 13:51:51Z ldesorgh $
//
/// \file eventgenerator/exgps/src/TrackingAction.cc
/// \brief Implementation of the TrackingAction class
//
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#include "TrackingAction.hh"
#include "HistoManager.hh"

#include "G4Track.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"

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TrackingAction::TrackingAction()
:G4UserTrackingAction()
{ }

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void TrackingAction::PreUserTrackingAction(const G4Track* track)
{
  G4int pid               = track->GetDynamicParticle()->GetPDGcode();
  G4double ekin           = track->GetKineticEnergy();
  G4ThreeVector vertex    = track->GetPosition();
  G4ThreeVector direction = track->GetMomentumDirection();
  G4double weight         = track->GetWeight();
   
  G4double x = vertex.x(), y = vertex.y(), z = vertex.z();
  G4double theta = direction.theta(), phi = direction.phi();
  if (phi < 0.) phi += twopi;
  G4double cost = std::cos(theta);
  
  G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
    
  G4double r = vertex.mag();
  G4double dr = analysisManager->GetH1Width(2);
  G4double dv = 2*twopi*r*r*dr;  

  // fill histograms    
  analysisManager->FillH1(1,ekin);
  if (dv > 0.) analysisManager->FillH1(2, r, 1./dv);  
  analysisManager->FillH1(3,cost);  
  analysisManager->FillH1(4,phi);    
  analysisManager->FillH2(1,x,y);
  analysisManager->FillH2(2,y,z);
  analysisManager->FillH2(3,z,x);      
  analysisManager->FillH2(4,phi,cost);
  analysisManager->FillH2(5,phi,theta);
  
  // fill ntuple  
  analysisManager->FillNtupleIColumn(0,pid);
  analysisManager->FillNtupleDColumn(1,ekin);
  analysisManager->FillNtupleDColumn(2,x);
  analysisManager->FillNtupleDColumn(3,y);
  analysisManager->FillNtupleDColumn(4,z);
  analysisManager->FillNtupleDColumn(5,theta);
  analysisManager->FillNtupleDColumn(6,phi);
  analysisManager->FillNtupleDColumn(7,weight);
  analysisManager->AddNtupleRow();  
}

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