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/// \file wls.cc
/// \brief Main program of the optical/wls example

#include "FTFP_BERT.hh"
#include "WLSActionInitialization.hh"
#include "WLSDetectorConstruction.hh"

#include "G4EmStandardPhysics_option4.hh"
#include "G4OpticalPhysics.hh"
#include "G4RunManagerFactory.hh"
#include "G4Types.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"

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int main(int argc, char** argv)
{
  // Instantiate G4UIExecutive if interactive mode
  G4UIExecutive* ui = nullptr;
  if (argc == 1) {
    ui = new G4UIExecutive(argc, argv);
  }

  auto runManager = G4RunManagerFactory::CreateRunManager();
  G4int seed = 123;
  if (argc > 2) seed = atoi(argv[argc - 1]);

  // Choose the Random engine and set the seed
  // G4Random::setTheEngine(new CLHEP::RanecuEngine);
  G4Random::setTheSeed(seed);

  // Detector construction
  auto detector = new WLSDetectorConstruction();
  runManager->SetUserInitialization(detector);

  // Physics list
  G4VModularPhysicsList* physicsList = new FTFP_BERT;
  physicsList->ReplacePhysics(new G4EmStandardPhysics_option4());
  auto opticalPhysics = new G4OpticalPhysics();

  auto opticalParams = G4OpticalParameters::Instance();
  opticalParams->SetBoundaryInvokeSD(true);

  physicsList->RegisterPhysics(opticalPhysics);
  runManager->SetUserInitialization(physicsList);

  // User action initialization
  runManager->SetUserInitialization(new WLSActionInitialization(detector));

  // Initialize visualization
  G4VisManager* visManager = new G4VisExecutive;
  visManager->Initialize();

  // Get the pointer to the User Interface manager
  G4UImanager* UImanager = G4UImanager::GetUIpointer();

  if (ui) {
    // Define (G)UI terminal for interactive mode
    if (ui->IsGUI()) UImanager->ApplyCommand("/control/execute gui.mac");
    ui->SessionStart();
    delete ui;
  }
  else {
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command + fileName);
  }

  // job termination
  delete visManager;
  delete runManager;
  return 0;
}

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