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//
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#include "StepMax.hh"
#include "DetectorConstruction.hh"
#include "G4VPhysicalVolume.hh"
#include "G4TransportationProcessType.hh"

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StepMax::StepMax(DetectorConstruction* ptr, const G4String& processName)
  : G4VEmProcess(processName, fGeneral),fMaxChargedStep(DBL_MAX),
    fDetector(ptr),fWorld(nullptr),isInitialised(false)
{
  SetProcessSubType(static_cast<G4int>(STEP_LIMITER));  
}

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StepMax::~StepMax() 
{}

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G4bool StepMax::IsApplicable(const G4ParticleDefinition& part)
{
  return (part.GetPDGCharge() != 0. && !part.IsShortLived());
}

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void StepMax::PreparePhysicsTable(const G4ParticleDefinition&)
{
  if(isInitialised) {
    isInitialised = false;
  }
}

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void StepMax::BuildPhysicsTable(const G4ParticleDefinition&)
{
  if(!isInitialised) {
    fMaxChargedStep = fDetector->GetMaxChargedStep();
    fWorld = fDetector->GetWorldPhysVol();
    isInitialised = true;
    if(fMaxChargedStep < DBL_MAX) {
      G4cout << GetProcessName() << ":  SubType= " << GetProcessSubType()
             << "  Step limit(mm)= " << fMaxChargedStep << G4endl;
    }
  }
}

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void StepMax::InitialiseProcess(const G4ParticleDefinition*)
{}

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G4double 
StepMax::PostStepGetPhysicalInteractionLength(const G4Track& aTrack,
                                              G4double,
                                              G4ForceCondition* condition)
{
  // condition is set to "Not Forced"
  *condition = NotForced;
  return (aTrack.GetVolume() != fWorld) ? fMaxChargedStep : DBL_MAX;
}

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G4VParticleChange* StepMax::PostStepDoIt(const G4Track& aTrack, const G4Step&)
{
  // do nothing
  aParticleChange.Initialize(aTrack);
  return &aParticleChange;
}

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