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//
//
// $Id: G4UserSpecialCuts.cc,v 1.17 2007/06/01 07:53:27 ahoward Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// --------------------------------------------------------------
// History
//
// 15-04-98 first implementation, mma
// 07-04-03 migrade to cut per region (V.Ivanchenko)
// 18-09-03 substitute manager for the loss tables (V.Ivanchenko)
// 23-01-04 add protection for charged geantino in range cut (H.Kurashige)
// 09-09-04 tracking cut applied only if Rmin or Emin > DBL_MIN
// --------------------------------------------------------------

#include "G4UserSpecialCuts.hh"

#include "G4Step.hh"
#include "G4UserLimits.hh"
#include "G4VParticleChange.hh"
#include "G4LossTableManager.hh"

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G4UserSpecialCuts::G4UserSpecialCuts(const G4String& aName)
  : G4VProcess(aName)
{
   if (verboseLevel>0)
   {
     G4cout << GetProcessName() << " is created "<< G4endl;
   }
   theLossTableManager = G4LossTableManager::Instance();
}

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G4UserSpecialCuts::~G4UserSpecialCuts()
{
}

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G4UserSpecialCuts::G4UserSpecialCuts(G4UserSpecialCuts& right)
  : G4VProcess(right)
{
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4double G4UserSpecialCuts::
PostStepGetPhysicalInteractionLength( const G4Track& aTrack,
                                            G4double, // previousStepSize
                                            G4ForceCondition* condition  )
{
  // condition is set to "Not Forced"
  *condition = NotForced;

   G4double ProposedStep = DBL_MAX;
   G4UserLimits* pUserLimits =
                 aTrack.GetVolume()->GetLogicalVolume()->GetUserLimits();
   if (pUserLimits)
   {
     // max track length
     //
     ProposedStep = (pUserLimits->GetUserMaxTrackLength(aTrack)
                   - aTrack.GetTrackLength());
     if (ProposedStep < 0.) return 0.;

     // max time limit
     //
     G4double beta  = (aTrack.GetDynamicParticle()->GetTotalMomentum())
                     /(aTrack.GetTotalEnergy());
     G4double dTime = (pUserLimits->GetUserMaxTime(aTrack)
                     - aTrack.GetGlobalTime());
     G4double temp  = beta*c_light*dTime;
     if (temp < 0.) return 0.;
     if (ProposedStep > temp) ProposedStep = temp;
                 
     // min remaining range 
     // (only for charged particle except for chargedGeantino)
     //
     G4ParticleDefinition* Particle = aTrack.GetDefinition();
     if ( (Particle->GetPDGCharge() != 0.) 
	  && (Particle->GetParticleType() != "geantino"))
     {
       G4double Ekine = aTrack.GetKineticEnergy();
       const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
       G4double RangeNow = theLossTableManager->GetRange(Particle,Ekine,couple);
       G4double Rmin = pUserLimits->GetUserMinRange(aTrack);
       if (Rmin > DBL_MIN) {
         temp = RangeNow - Rmin;
         if (temp < 0.) return 0.;
         if (ProposedStep > temp) ProposedStep = temp;
       }	 

       // min kinetic energy (only for charged particle)
       //
       G4double Emin = pUserLimits->GetUserMinEkine(aTrack);
       if (Emin > DBL_MIN) {
         Rmin = theLossTableManager->GetRange(Particle,Emin,couple);
         temp = RangeNow - Rmin;
         if (temp < 0.) return 0.;
         if (ProposedStep > temp) ProposedStep = temp;
       }	 
     }
   }
   return ProposedStep;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4VParticleChange*
G4UserSpecialCuts::PostStepDoIt( const G4Track& aTrack,
                                 const G4Step&  )
//
// Kill the current particle, if requested by G4UserLimits
//
{
   aParticleChange.Initialize(aTrack);
   aParticleChange.ProposeEnergy(0.) ;
   aParticleChange.ProposeLocalEnergyDeposit(aTrack.GetKineticEnergy()) ;
   aParticleChange.ProposeTrackStatus(fStopAndKill);
   return &aParticleChange;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......