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// $Id: StackingAction.cc,v 1.2 2007/03/02 11:08:41 maire Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//
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#include "StackingAction.hh"

#include "DetectorConstruction.hh"
#include "RunAction.hh"
#include "HistoManager.hh"
#include "StackingMessenger.hh"

#include "G4Track.hh"
#include "G4EmCalculator.hh"

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StackingAction::StackingAction(DetectorConstruction* det, RunAction* run,
                               HistoManager* histo)
:detector(det),runAction(run),histoManager(histo)
{
  matWall = 0;
  Zcav = 0.; 
  emCal = 0;
  first = true;
  killTrack  = true;
  
  //create a messenger for this class  
  stackMessenger = new StackingMessenger(this);
}

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StackingAction::~StackingAction()
{
  delete emCal;
  delete stackMessenger;
}

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G4ClassificationOfNewTrack
StackingAction::ClassifyNewTrack(const G4Track* track)
{
 //get detector informations
 if (first) {
   matWall = detector->GetWallMaterial();
   Zcav    = 0.5*(detector->GetCavityThickness());
   emCal   = new G4EmCalculator();
   first   = false;
 }
 
 G4ClassificationOfNewTrack status = fUrgent;  

 //keep primary particle or neutral
 //
 G4ParticleDefinition* particle = track->GetDefinition();
 G4bool neutral = (particle->GetPDGCharge() == 0.);
 if ((track->GetParentID() == 0) || neutral) return status;

 //energy spectrum of charged secondaries
 //
  G4double energy = track->GetKineticEnergy();  
  runAction->sumEsecond(energy);
  
 // kill e- which cannot reach Cavity
 //
 G4double position = (track->GetPosition()).z();
 G4double safe = std::abs(position) - Zcav;
 G4double range = emCal->GetRangeFromRestricteDEDX(energy,particle,matWall);
 if (killTrack) {
   if (range < 0.8*safe) status = fKill;
 }

 //histograms
 //
 histoManager->FillHisto(1,position);
 histoManager->FillHisto(2,energy);
 G4ThreeVector direction = track->GetMomentumDirection();
 histoManager->FillHisto(3,std::acos(direction.z()));      
    
 return status;
}

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