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/// \file SteppingAction.cc
/// \brief Implementation of the SteppingAction class

#include "SteppingAction.hh"

#include "DetectorConstruction.hh"
#include "PrimaryGeneratorAction.hh"
#include "RunAction.hh"

#include "G4PolarizationHelper.hh"
#include "G4RunManager.hh"

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SteppingAction::SteppingAction(DetectorConstruction* det, PrimaryGeneratorAction* prim,
                               RunAction* ruAct)
  : G4UserSteppingAction(), fDetector(det), fPrimary(prim), fRunAction(ruAct)
{}

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SteppingAction::~SteppingAction() {}

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void SteppingAction::UserSteppingAction(const G4Step* aStep)
{
  G4StepPoint* prePoint = aStep->GetPreStepPoint();
  G4StepPoint* endPoint = aStep->GetPostStepPoint();

  G4String procName = endPoint->GetProcessDefinedStep()->GetProcessName();
  fRunAction->CountProcesses(procName);

  if (prePoint->GetTouchableHandle()->GetVolume() == fDetector->GetBox()
      && endPoint->GetTouchableHandle()->GetVolume() == fDetector->GetWorld())
  {
    G4Track* aTrack = aStep->GetTrack();
    const G4ParticleDefinition* part = aTrack->GetDynamicParticle()->GetDefinition();
    //    G4cout<<"a "<<particleName<<" left the Box \n";
    G4ThreeVector position = endPoint->GetPosition();
    G4ThreeVector direction = endPoint->GetMomentumDirection();
    G4double kinEnergy = endPoint->GetKineticEnergy();

    G4ThreeVector beamDirection = fPrimary->GetParticleGun()->GetParticleMomentumDirection();
    G4double polZ = endPoint->GetPolarization().z();

    G4double costheta = direction * beamDirection;

    G4double xdir = direction * G4PolarizationHelper::GetParticleFrameX(beamDirection);
    G4double ydir = direction * G4PolarizationHelper::GetParticleFrameY(beamDirection);

    G4double phi = std::atan2(ydir, xdir);
    fRunAction->FillData(part, kinEnergy, costheta, phi, polZ);
  }
}

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