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/// \file medical/fanoCavity/src/StackingAction.cc
/// \brief Implementation of the StackingAction class
//
// $Id$
//
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#include "StackingAction.hh"

#include "DetectorConstruction.hh"
#include "RunAction.hh"
#include "HistoManager.hh"
#include "G4RunManager.hh"
#include "StackingMessenger.hh"
#include "Run.hh"

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

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StackingAction::StackingAction(DetectorConstruction* det)
:fDetector(det),fStackMessenger(0)
{
  fMatWall = 0;
  fZcav = 0.; 
  fEmCal = 0;
  first = true;
  fKillTrack  = true;
  
  //create a messenger for this class  
  fStackMessenger = new StackingMessenger(this);
}

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StackingAction::~StackingAction()
{
  delete fEmCal;
  delete fStackMessenger;
}

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G4ClassificationOfNewTrack
StackingAction::ClassifyNewTrack(const G4Track* track)
{
 //get fDetector informations
 if (first) {
   fMatWall = fDetector->GetWallMaterial();
   fZcav    = 0.5*(fDetector->GetCavityThickness());
   fEmCal   = 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;

 Run* run = static_cast<Run*>(
              G4RunManager::GetRunManager()->GetNonConstCurrentRun());

 //energy spectrum of charged secondaries
 //
  G4double energy = track->GetKineticEnergy();  
  run->SumEsecond(energy);
  
 // kill e- which cannot reach Cavity
 //
 G4double position = (track->GetPosition()).z();
 G4double safe = std::abs(position) - fZcav;
 G4double range = fEmCal->GetRangeFromRestricteDEDX(energy,particle,fMatWall);
 if (fKillTrack) {
   if (range < 0.8*safe) status = fKill;
 }

 //histograms
 //
 G4AnalysisManager* analysisManager = G4AnalysisManager::Instance(); 
 analysisManager->FillH1(1,position);
 analysisManager->FillH1(2,energy);
 G4ThreeVector direction = track->GetMomentumDirection();
 analysisManager->FillH1(3,std::acos(direction.z()));      
    
 return status;
}

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