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

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#include "TrackingAction.hh"

#include "Run.hh"

#include "G4IonTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4ParticleTypes.hh"
#include "G4Step.hh"
#include "G4StepPoint.hh"
#include "G4SystemOfUnits.hh"
#include "G4Track.hh"

const std::array<G4String, TrackingAction::fkNumberScoringVolumes>
  TrackingAction::fkArrayScoringVolumeNames = {"layer"};

const std::array<G4String, TrackingAction::fkNumberKinematicRegions>
  TrackingAction::fkArrayKinematicRegionNames = {"", "below 20 MeV", "above 20 MeV"};

const std::array<G4String, TrackingAction::fkNumberParticleTypes>
  TrackingAction::fkArrayParticleTypeNames = {"all",      "electron",   "gamma",      "muon",
                                              "neutrino", "pion",       "neutron",    "proton",
                                              "ion",      "otherMeson", "otherBaryon"};

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G4int TrackingAction::GetIndex(const G4int iScoringVolume, const G4int iKinematicRegion,
                               const G4int iParticleType)
{
  G4int index = -1;
  if (iScoringVolume >= 0 && iScoringVolume < fkNumberScoringVolumes && iKinematicRegion >= 0
      && iKinematicRegion < fkNumberKinematicRegions && iParticleType >= 0
      && iParticleType < fkNumberParticleTypes)
  {
    index = iScoringVolume * fkNumberKinematicRegions * fkNumberParticleTypes
            + iKinematicRegion * fkNumberParticleTypes + iParticleType;
  }
  return index;
}

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TrackingAction::TrackingAction() : G4UserTrackingAction()
{
  Initialize();
}

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void TrackingAction::Initialize()
{
  // Initialization needed at the beginning of each Run
  fArrayMultiplicities.fill(0);
  fArraySumKineticEnergies.fill(0.0);
}

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void TrackingAction::PreUserTrackingAction(const G4Track* aTrack)
{
  // This method is called not only once when a particle is created,
  // but also each time it is resumed, in the case the track gets suspended,
  // as it happens in the case of neutrons with _HP Physics Lists.
  // To be sure that we collect information about a track one and only once,
  // we require that the current step be the first one.
  if (aTrack == nullptr || aTrack->GetCurrentStepNumber() != 0 || aTrack->GetDefinition() == nullptr
      || aTrack->GetLogicalVolumeAtVertex() == nullptr
      || aTrack->GetLogicalVolumeAtVertex()->GetName() != "logicLayer")
    return;
  G4int iScoringVolume = 0;
  // Three kinematical regions:  [0] : any value ;  [1] : below 20 MeV ;  [2] : above 20 MeV
  G4int iKinematicRegion = aTrack->GetKineticEnergy() < 20.0 ? 1 : 2;
  G4int absPdg = std::abs(aTrack->GetDefinition()->GetPDGEncoding());
  G4int iParticleType = -1;
  if (absPdg == 11)
    iParticleType = 1;  // electron (and positron)
  else if (absPdg == 22)
    iParticleType = 2;  // gamma
  else if (absPdg == 13)
    iParticleType = 3;  // muons (mu- and mu+)
  else if (absPdg == 12 || absPdg == 14 || absPdg == 16)
    iParticleType = 4;
  // neutrinos (and anti-neutrinos), all flavors
  else if (absPdg == 111 || absPdg == 211)
    iParticleType = 5;  // (charged) pions
  else if (absPdg == 2112)
    iParticleType = 6;  // neutron (and anti-neutron)
  else if (absPdg == 2212)
    iParticleType = 7;  // proton  (and anti-proton)
  else if (G4IonTable::IsIon(aTrack->GetDefinition())
           || G4IonTable::IsAntiIon(aTrack->GetDefinition()))
    iParticleType = 8;
  // ions (and anti-ions)
  else if (absPdg < 1000)
    iParticleType = 9;  // other mesons (e.g. kaons)
  // (Note: this works in most cases, but not always!)
  else if (absPdg > 1000)
    iParticleType = 10;  // other baryons (e.g. hyperons,
                         // anti-hyperons, etc.)
  // Consider the specific case : scoring volume, kinematic region and particle type
  G4int index = GetIndex(iScoringVolume, iKinematicRegion, iParticleType);
  ++fArrayMultiplicities[index];
  fArraySumKineticEnergies[index] += aTrack->GetKineticEnergy();
  // Consider the "all" particle case, with the same scoring volume and kinematic region
  index = GetIndex(iScoringVolume, iKinematicRegion, 0);
  ++fArrayMultiplicities[index];
  fArraySumKineticEnergies[index] += aTrack->GetKineticEnergy();
  // Consider the "any" kinematic region case, with the same scoring volume and particle type
  index = GetIndex(iScoringVolume, 0, iParticleType);
  ++fArrayMultiplicities[index];
  fArraySumKineticEnergies[index] += aTrack->GetKineticEnergy();
  // Consider the "any" kinematic region and "all" particle, with the same scoring volume
  index = GetIndex(iScoringVolume, 0, 0);
  ++fArrayMultiplicities[index];
  fArraySumKineticEnergies[index] += aTrack->GetKineticEnergy();
  if (fRunPtr) {
    fRunPtr->SetTrackingArray1(fArrayMultiplicities);
    fRunPtr->SetTrackingArray2(fArraySumKineticEnergies);
  }
}

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void TrackingAction::PostUserTrackingAction(const G4Track* /* aTrack  */) {}

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