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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software
// shall cite the following Geant4-DNA collaboration publications:
// Med. Phys. 45 (2018) e722-e739
// Phys. Med. 31 (2015) 861-874
// Med. Phys. 37 (2010) 4692-4708
// Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
//
// The Geant4-DNA web site is available at http://geant4-dna.org
//
/// \file medical/dna/range/src/DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class

#include "DetectorConstruction.hh"

#include "DetectorMessenger.hh"

#include "G4GeometryManager.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4NistManager.hh"
#include "G4PVPlacement.hh"
#include "G4PhysicalConstants.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4RunManager.hh"
#include "G4SolidStore.hh"
#include "G4Sphere.hh"
#include "G4SystemOfUnits.hh"
#include "G4UnitsTable.hh"
#include "G4UserLimits.hh"

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

DetectorConstruction::DetectorConstruction()
  : G4VUserDetectorConstruction(), fAbsorMaterial(0), fAbsor(0), fDetectorMessenger(0)
{
  // Default tracking cut
  fTrackingCut = 7.4 * eV;

  // Default parameter values
  fAbsorRadius = 1 * m;

  DefineMaterials();
  SetMaterial("G4_WATER");

  // Create commands for interactive definition of the detector
  fDetectorMessenger = new DetectorMessenger(this);
}

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

DetectorConstruction::~DetectorConstruction()
{
  delete fDetectorMessenger;
}

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

G4VPhysicalVolume* DetectorConstruction::Construct()
{
  return ConstructVolumes();
}

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

void DetectorConstruction::DefineMaterials()
{
  G4NistManager* man = G4NistManager::Instance();
  man->FindOrBuildMaterial("G4_WATER");
}

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

G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();

  // Spherical absorber
  G4Sphere* sAbsor = new G4Sphere("Absorber",  // name
                                  0., fAbsorRadius, 0., twopi, 0., pi);  // size

  fLogicalAbsor = new G4LogicalVolume(sAbsor,  // solid
                                      fAbsorMaterial,  // material
                                      "Absorber");  // name

  fAbsor = new G4PVPlacement(0,  // no rotation
                             G4ThreeVector(),  // at (0,0,0)
                             fLogicalAbsor,  // logical volume
                             "Absorber",  // name
                             0,  // mother volume
                             false,  // no boolean operation
                             0);  // copy number

  PrintParameters();

  fLogicalAbsor->SetUserLimits(new G4UserLimits(DBL_MAX, DBL_MAX, DBL_MAX, fTrackingCut));

  // Always return the root volume
  return fAbsor;
}

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

void DetectorConstruction::PrintParameters() const
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The tracking cut to all particles is set to "
         << G4BestUnit(fTrackingCut, "Energy") << G4endl;
  G4cout << "---> The Absorber is a sphere of " << G4BestUnit(fAbsorRadius, "Length")
         << " radius of " << fAbsorMaterial->GetName() << " made of"
         << "\n \n"
         << fAbsorMaterial << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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

void DetectorConstruction::SetTrackingCut(G4double value)
{
  fTrackingCut = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

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

void DetectorConstruction::SetRadius(G4double value)
{
  fAbsorRadius = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

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

void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  // Search the material by its name
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);
  if (pttoMaterial) fAbsorMaterial = pttoMaterial;
  G4RunManager::GetRunManager()->PhysicsHasBeenModified();
}