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

#include "DetectorConstruction.hh"

#include "ScreenSD.hh"

#include "G4AutoDelete.hh"
#include "G4Box.hh"
#include "G4Colour.hh"
#include "G4GlobalMagFieldMessenger.hh"
#include "G4LogicalVolume.hh"
#include "G4Material.hh"
#include "G4NistManager.hh"
#include "G4PVPlacement.hh"
#include "G4SDManager.hh"
#include "G4SystemOfUnits.hh"
#include "G4VisAttributes.hh"

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G4ThreadLocal G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Get nist material manager
  G4NistManager* nistManager = G4NistManager::Instance();

  // Build materials
  G4Material* air = nistManager->FindOrBuildMaterial("G4_AIR");
  G4Material* csi = nistManager->FindOrBuildMaterial("G4_CESIUM_IODIDE");
  // There is no need to test if materials were built/found
  // as G4NistManager would issue an error otherwise
  // Try the code with "XYZ".

  // Print all materials
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;

  // Option to switch on/off checking of volumes overlaps
  G4bool checkOverlaps = true;

  //
  // World
  //

  // The world dimensions
  G4double worldHxyz = 2. * m;

  // world volume
  auto worldS = new G4Box("World", worldHxyz, worldHxyz, worldHxyz);

  auto worldLV = new G4LogicalVolume(worldS, air, "World");

  G4VPhysicalVolume* worldPV =
    new G4PVPlacement(nullptr, G4ThreeVector(), worldLV, "World", nullptr, false, 0, checkOverlaps);

  //
  // Box
  //

  // The box dimensions
  G4double boxHxy = 1. * m;
  G4double boxHz = 10. * cm;

  // box volume
  auto boxS = new G4Box("World", boxHxy, boxHxy, boxHz);

  auto boxLV = new G4LogicalVolume(boxS, csi, "Box");

  // The box position
  G4double posz = 0. * m;

  new G4PVPlacement(nullptr, G4ThreeVector(0, 0, posz), boxLV, "Box", worldLV, false, 0,
                    checkOverlaps);

  //
  // Scoring screen
  //
  // The screen dimensions
  G4double screenHxy = 1.999 * m;
  G4double screenHz = 1. * mm;

  // Screen volume
  auto screenS = new G4Box("World", screenHxy, screenHxy, screenHz);

  auto screenLV = new G4LogicalVolume(screenS, air, "Screen");

  // The screen position
  posz += boxHz + screenHz;

  new G4PVPlacement(nullptr, G4ThreeVector(0, 0, posz), screenLV, "Screen", worldLV, false, 0,
                    checkOverlaps);

  //
  // Visualization attributes
  //
  worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());

  auto simpleBoxVisAtt = new G4VisAttributes(G4Colour(1.0, 1.0, 1.0));
  simpleBoxVisAtt->SetVisibility(true);
  boxLV->SetVisAttributes(simpleBoxVisAtt);
  screenLV->SetVisAttributes(simpleBoxVisAtt);

  //
  // Always return the physical World
  //
  return worldPV;
}

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void DetectorConstruction::ConstructSDandField()
{
  // G4SDManager::GetSDMpointer()->SetVerboseLevel(1);

  //
  // Sensitive detectors
  //
  auto screenSD = new ScreenSD("ScreenSD");
  G4SDManager::GetSDMpointer()->AddNewDetector(screenSD);
  SetSensitiveDetector("Screen", screenSD);

  //
  // Magnetic field
  //
  // Create global magnetic field messenger.
  // Uniform magnetic field is then created automatically if
  // the field value is not zero.
  G4ThreeVector fieldValue;
  fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
  fMagFieldMessenger->SetVerboseLevel(1);

  // Register the field messenger for deleting
  G4AutoDelete::Register(fMagFieldMessenger);
}

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