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//
//---------------------------------------------------------------------------
//
// ClassName:   G4ElectronCapture
//
// Description: The process to kill particles to save CPU
//
// Author:      V.Ivanchenko 31 August 2010
//
//----------------------------------------------------------------------------
//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// and the DNA geometry given in the Geom_DNA example 
// shall cite the following Geant4-DNA collaboration publications:
// [1] NIM B 298 (2013) 47-54
// [2] Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
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#include "G4ElectronCapture.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleDefinition.hh"
#include "G4Step.hh"
#include "G4Track.hh"
#include "G4Region.hh"
#include "G4RegionStore.hh"
#include "G4Electron.hh"

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G4ElectronCapture::G4ElectronCapture(const G4String& regName, G4double ekinlim)
  : G4VDiscreteProcess("eCapture", fElectromagnetic), kinEnergyThreshold(ekinlim),
    regionName(regName), region(0)
{
  if(regName == "" || regName == "world") { 
    regionName = "DefaultRegionForTheWorld";
  }
  pParticleChange = &fParticleChange;
}

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G4ElectronCapture::~G4ElectronCapture() 
{}

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void G4ElectronCapture::SetKinEnergyLimit(G4double val)
{
  kinEnergyThreshold = val;
  if(verboseLevel > 0) {
    G4cout << "### G4ElectronCapture: Tracking cut E(MeV) = " 
	   << kinEnergyThreshold/MeV << G4endl;
  }
}
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void G4ElectronCapture::BuildPhysicsTable(const G4ParticleDefinition&)
{
  region = (G4RegionStore::GetInstance())->GetRegion(regionName);
  if(region && verboseLevel > 0) {
    G4cout << "### G4ElectronCapture: Tracking cut E(MeV) = " 
	   << kinEnergyThreshold/MeV << " is assigned to " << regionName 
	   << G4endl;
  }
}

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G4bool G4ElectronCapture::IsApplicable(const G4ParticleDefinition&)
{
  return true;
}

G4double 
G4ElectronCapture::PostStepGetPhysicalInteractionLength(const G4Track& aTrack,
							G4double, 
							G4ForceCondition* condition)
{
  // condition is set to "Not Forced"
  *condition = NotForced;
  
  G4double limit = DBL_MAX; 
  if(region) {
    if(aTrack.GetVolume()->GetLogicalVolume()->GetRegion() == region && 
	 aTrack.GetKineticEnergy() < kinEnergyThreshold) { limit = 0.0; }
  }
  return limit;
}

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G4VParticleChange* G4ElectronCapture::PostStepDoIt(const G4Track& aTrack, 
						   const G4Step&)
{
  pParticleChange->Initialize(aTrack);
  pParticleChange->ProposeTrackStatus(fStopAndKill);
  pParticleChange->ProposeLocalEnergyDeposit(aTrack.GetKineticEnergy());
  fParticleChange.SetProposedKineticEnergy(0.0);
  return pParticleChange;
}

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G4double G4ElectronCapture::GetMeanFreePath(const G4Track&,G4double,
					    G4ForceCondition*)
{
  return DBL_MAX;
}    

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