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/// \file Par04SensitiveDetector.hh
/// \brief Definition of the Par04SensitiveDetector class

#ifndef PAR04SENSITIVEDETECTOR_HH
#define PAR04SENSITIVEDETECTOR_HH

#include "Par04Hit.hh"  // for Par04Hit (ptr only), Par04...

#include "G4SystemOfUnits.hh"  // for m
#include "G4ThreeVector.hh"  // for G4ThreeVector
#include "G4VFastSimSensitiveDetector.hh"  // for G4VFastSimSensitiveDetector
#include "G4VSensitiveDetector.hh"  // for G4VSensitiveDetector

#include <CLHEP/Units/SystemOfUnits.h>  // for m, pi
#include <G4String.hh>  // for G4String
#include <G4Types.hh>  // for G4bool, G4int
#include <unordered_map>
class G4FastHit;
class G4FastTrack;
class G4HCofThisEvent;
class G4Step;
class G4TouchableHistory;

/**
 * @brief Sensitive detector.
 *
 * Describes how to store the energy deposited within the detector.
 * It derives from two classes: G4VSensitiveDetector and
 * G4VFastSimSensitiveDetector. Addition of G4VFastSimSensitiveDetector is
 * necessary in order to handle the energy deposits from the fast simulation.
 *
 * Two ProcessHits() methods are introduced to handle energy deposited from full
 * (detailed) simulation, and from fast simulation. The common part is handled
 * by RetrieveAdnSetupHit() method.
 *
 */

class Par04SensitiveDetector : public G4VSensitiveDetector, public G4VFastSimSensitiveDetector
{
  public:
    Par04SensitiveDetector(G4String aName);
    Par04SensitiveDetector(G4String aName, G4ThreeVector aNbOfCells, G4ThreeVector aNSizeOfCells);
    virtual ~Par04SensitiveDetector();
    /// Create hit collection
    virtual void Initialize(G4HCofThisEvent* HCE) final;
    /// Process energy deposit from the full simulation.
    virtual G4bool ProcessHits(G4Step* aStep, G4TouchableHistory* aROhist) final;
    /// Process energy deposit from the fast simulation.
    virtual G4bool ProcessHits(const G4FastHit* aHit, const G4FastTrack* aTrack,
                               G4TouchableHistory* aROhist) final;
    /// Process energy deposit - common part for full and fast simulation
    /// It is invoked from ProcessHits() methods, and sets basic hit properties
    /// (position, etc.), common for hit from fast and full simulation.
    Par04Hit* RetrieveAndSetupHit(G4ThreeVector aPosition);
    /// Rewrite hits map to a vector
    virtual void EndOfEvent(G4HCofThisEvent* aHC) final;

  private:
    /// Collection of hits
    Par04HitsCollection* fHitsCollection = nullptr;
    /// Map of hits to be used in runtime
    std::unordered_map<G4int, std::unique_ptr<Par04Hit>> fHitsMap;
    /// ID of collection of hits
    G4int fHitCollectionID = -1;
    /// Number of mesh readout cells in cylindrical coordinates
    G4ThreeVector fMeshNbOfCells = {10, 10, 10};
    /// Size of mesh readout cells in cylindrical coordinates.
    G4ThreeVector fMeshSizeOfCells = {1 * m, 2 * CLHEP::pi / 10., 1 * m};
    /// Retrieved once per event: position of entering particle
    G4ThreeVector fEntrancePosition = {-1, -1, -1};
    /// Retrieved once per event: direction of entering particle
    G4ThreeVector fEntranceDirection = {-1, -1, -1};
};

#endif /* PAR04SENSITIVEDETECTOR_HH */
