#include "Geometry.h"

#include "G4Box.hh"
#include "G4NistManager.hh"
#include "G4LogicalVolume.hh"
#include "G4SystemOfUnits.hh"
#include "G4PVPlacement.hh"

G4VPhysicalVolume* DetectorConstruction::Construct() {
    // Solid
    auto solid_world = new G4Box("world", 638 / 2 * mm, 630 / 2 * mm, 555. / 2 * mm);
    // Logic
    auto nist = G4NistManager::Instance();
    auto logic_world = new G4LogicalVolume(solid_world, nist->FindOrBuildMaterial("G4_WATER"), "world");
    // Physics
    auto physics_world = new G4PVPlacement(
        0,
        G4ThreeVector(0, 0, 0),
        logic_world,
        "world",
        0,
        false,
        0,
        true
    );
    return physics_world;
}