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//
/// \file EventAction.cc
/// \brief Implementation of the B4d::EventAction class

#include "EventAction.hh"

#include "G4AnalysisManager.hh"
#include "G4Event.hh"
#include "G4HCofThisEvent.hh"
#include "G4RunManager.hh"
#include "G4SDManager.hh"
#include "G4THitsMap.hh"
#include "G4UnitsTable.hh"

#include <iomanip>

namespace B4d
{

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

G4THitsMap<G4double>* EventAction::GetHitsCollection(G4int hcID, const G4Event* event) const
{
  auto hitsCollection = static_cast<G4THitsMap<G4double>*>(event->GetHCofThisEvent()->GetHC(hcID));

  if (!hitsCollection) {
    G4ExceptionDescription msg;
    msg << "Cannot access hitsCollection ID " << hcID;
    G4Exception("EventAction::GetHitsCollection()", "MyCode0003", FatalException, msg);
  }

  return hitsCollection;
}

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

G4double EventAction::GetSum(G4THitsMap<G4double>* hitsMap) const
{
  G4double sumValue = 0.;
  for (auto it : *hitsMap->GetMap()) {
    // hitsMap->GetMap() returns the map of std::map<G4int, G4double*>
    sumValue += *(it.second);
  }
  return sumValue;
}

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

void EventAction::PrintEventStatistics(G4double absoEdep, G4double absoTrackLength,
                                       G4double gapEdep, G4double gapTrackLength) const
{
  // Print event statistics
  //
  G4cout << "   Absorber: total energy: " << std::setw(7) << G4BestUnit(absoEdep, "Energy")
         << "       total track length: " << std::setw(7) << G4BestUnit(absoTrackLength, "Length")
         << G4endl << "        Gap: total energy: " << std::setw(7) << G4BestUnit(gapEdep, "Energy")
         << "       total track length: " << std::setw(7) << G4BestUnit(gapTrackLength, "Length")
         << G4endl;
}

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

void EventAction::BeginOfEventAction(const G4Event* /*event*/) {}

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

void EventAction::EndOfEventAction(const G4Event* event)
{
  // Get hist collections IDs
  if (fAbsoEdepHCID == -1) {
    fAbsoEdepHCID = G4SDManager::GetSDMpointer()->GetCollectionID("Absorber/Edep");
    fGapEdepHCID = G4SDManager::GetSDMpointer()->GetCollectionID("Gap/Edep");
    fAbsoTrackLengthHCID = G4SDManager::GetSDMpointer()->GetCollectionID("Absorber/TrackLength");
    fGapTrackLengthHCID = G4SDManager::GetSDMpointer()->GetCollectionID("Gap/TrackLength");
  }

  // Get sum values from hits collections
  //
  auto absoEdep = GetSum(GetHitsCollection(fAbsoEdepHCID, event));
  auto gapEdep = GetSum(GetHitsCollection(fGapEdepHCID, event));

  auto absoTrackLength = GetSum(GetHitsCollection(fAbsoTrackLengthHCID, event));
  auto gapTrackLength = GetSum(GetHitsCollection(fGapTrackLengthHCID, event));

  // get analysis manager
  auto analysisManager = G4AnalysisManager::Instance();

  // fill histograms
  //
  analysisManager->FillH1(0, absoEdep);
  analysisManager->FillH1(1, gapEdep);
  analysisManager->FillH1(2, absoTrackLength);
  analysisManager->FillH1(3, gapTrackLength);

  // fill ntuple
  //
  analysisManager->FillNtupleDColumn(0, absoEdep);
  analysisManager->FillNtupleDColumn(1, gapEdep);
  analysisManager->FillNtupleDColumn(2, absoTrackLength);
  analysisManager->FillNtupleDColumn(3, gapTrackLength);
  analysisManager->AddNtupleRow();

  // print per event (modulo n)
  //
  auto eventID = event->GetEventID();
  auto printModulo = G4RunManager::GetRunManager()->GetPrintProgress();
  if ((printModulo > 0) && (eventID % printModulo == 0)) {
    PrintEventStatistics(absoEdep, absoTrackLength, gapEdep, gapTrackLength);
    G4cout << "--> End of event: " << eventID << "\n" << G4endl;
  }
}

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

}  // namespace B4d
