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// 
/// \file B4cEventAction.cc
/// \brief Implementation of the B4cEventAction class

#include "B4cEventAction.hh"
#include "B4cCalorimeterSD.hh"
#include "B4cCalorHit.hh"
#include "B4Analysis.hh"

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

#include "Randomize.hh"
#include <iomanip>

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B4cEventAction::B4cEventAction()
 : G4UserEventAction(),
   fAbsHCID(-1),
   fGapHCID(-1)
{}

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B4cEventAction::~B4cEventAction()
{}

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B4cCalorHitsCollection* 
B4cEventAction::GetHitsCollection(G4int hcID,
                                  const G4Event* event) const
{
  auto hitsCollection 
    = static_cast<B4cCalorHitsCollection*>(
        event->GetHCofThisEvent()->GetHC(hcID));
  
  if ( ! hitsCollection ) {
    G4ExceptionDescription msg;
    msg << "Cannot access hitsCollection ID " << hcID; 
    G4Exception("B4cEventAction::GetHitsCollection()",
      "MyCode0003", FatalException, msg);
  }         

  return hitsCollection;
}    

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void B4cEventAction::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;
}

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void B4cEventAction::BeginOfEventAction(const G4Event* /*event*/)
{}

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void B4cEventAction::EndOfEventAction(const G4Event* event)
{  
  // Get hits collections IDs (only once)
  if ( fAbsHCID == -1 ) {
    fAbsHCID 
      = G4SDManager::GetSDMpointer()->GetCollectionID("AbsorberHitsCollection");
    fGapHCID 
      = G4SDManager::GetSDMpointer()->GetCollectionID("GapHitsCollection");
  }

  // Get hits collections
  auto absoHC = GetHitsCollection(fAbsHCID, event);
  auto gapHC = GetHitsCollection(fGapHCID, event);

  // Get hit with total values
  auto absoHit = (*absoHC)[absoHC->entries()-1];
  auto gapHit = (*gapHC)[gapHC->entries()-1];
 
  // Print per event (modulo n)
  //
  auto eventID = event->GetEventID();
  auto printModulo = G4RunManager::GetRunManager()->GetPrintProgress();
  if ( ( printModulo > 0 ) && ( eventID % printModulo == 0 ) ) {
    G4cout << "---> End of event: " << eventID << G4endl;     

    PrintEventStatistics(
      absoHit->GetEdep(), absoHit->GetTrackLength(),
      gapHit->GetEdep(), gapHit->GetTrackLength());
  }  
  
  // Fill histograms, ntuple
  //

  // get analysis manager
  auto analysisManager = G4AnalysisManager::Instance();
 
  // fill histograms
  analysisManager->FillH1(0, absoHit->GetEdep());
  analysisManager->FillH1(1, gapHit->GetEdep());
  analysisManager->FillH1(2, absoHit->GetTrackLength());
  analysisManager->FillH1(3, gapHit->GetTrackLength());
  
  // fill ntuple
  analysisManager->FillNtupleDColumn(0, absoHit->GetEdep());
  analysisManager->FillNtupleDColumn(1, gapHit->GetEdep());
  analysisManager->FillNtupleDColumn(2, absoHit->GetTrackLength());
  analysisManager->FillNtupleDColumn(3, gapHit->GetTrackLength());
  analysisManager->AddNtupleRow();  
}  

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