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/// \file HodoscopeSD.cc
/// \brief Implementation of the B5::HodoscopeSD class

#include "HodoscopeSD.hh"

#include "HodoscopeHit.hh"

#include "G4AffineTransform.hh"
#include "G4HCofThisEvent.hh"
#include "G4SDManager.hh"
#include "G4Step.hh"
#include "G4StepPoint.hh"
#include "G4VPhysicalVolume.hh"
#include "G4VTouchable.hh"

namespace B5
{

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

HodoscopeSD::HodoscopeSD(G4String name) : G4VSensitiveDetector(name)
{
  collectionName.insert("hodoscopeColl");
}

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void HodoscopeSD::Initialize(G4HCofThisEvent* hce)
{
  fHitsCollection = new HodoscopeHitsCollection(SensitiveDetectorName, collectionName[0]);
  if (fHCID < 0) {
    fHCID = G4SDManager::GetSDMpointer()->GetCollectionID(fHitsCollection);
  }
  hce->AddHitsCollection(fHCID, fHitsCollection);
}

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G4bool HodoscopeSD::ProcessHits(G4Step* step, G4TouchableHistory*)
{
  auto edep = step->GetTotalEnergyDeposit();
  if (edep == 0.) return true;

  auto preStepPoint = step->GetPreStepPoint();
  auto touchable = preStepPoint->GetTouchable();
  auto copyNo = touchable->GetVolume()->GetCopyNo();
  auto hitTime = preStepPoint->GetGlobalTime();

  // check if this finger already has a hit
  auto ix = -1;
  for (std::size_t i = 0; i < fHitsCollection->entries(); ++i) {
    if ((*fHitsCollection)[i]->GetID() == copyNo) {
      ix = i;
      break;
    }
  }

  if (ix >= 0) {
    // if it has, then take the earlier time
    if ((*fHitsCollection)[ix]->GetTime() > hitTime) {
      (*fHitsCollection)[ix]->SetTime(hitTime);
    }
  }
  else {
    // if not, create a new hit and set it to the collection
    auto hit = new HodoscopeHit(copyNo, hitTime);
    auto physical = touchable->GetVolume();
    hit->SetLogV(physical->GetLogicalVolume());
    auto transform = touchable->GetHistory()->GetTopTransform();
    transform.Invert();
    hit->SetRot(transform.NetRotation());
    hit->SetPos(transform.NetTranslation());
    fHitsCollection->insert(hit);
  }
  return true;
}

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

}  // namespace B5
