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//
/// \file exampleB2a.cc
/// \brief Main program of the B2a example

#include "DetectorConstruction.hh"
#include "ActionInitialization.hh"

#include "G4RunManagerFactory.hh"
#include "G4SteppingVerbose.hh"
#include "G4UImanager.hh"
#include "FTFP_BERT.hh"
#include "G4StepLimiterPhysics.hh"

#include "Randomize.hh"

#include "G4VisExecutive.hh"
#include "G4UIExecutive.hh"

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int main(int argc,char** argv)
{
  // Detect interactive mode (if no arguments) and define UI session
  //
  G4UIExecutive* ui = nullptr;
  if ( argc == 1 ) { ui = new G4UIExecutive(argc, argv); }

  // Optionally: choose a different Random engine...
  // G4Random::setTheEngine(new CLHEP::MTwistEngine);

  //use G4SteppingVerboseWithUnits
  G4int precision = 4;
  G4SteppingVerbose::UseBestUnit(precision);

  // Construct the default run manager
  //
  auto runManager =
    G4RunManagerFactory::CreateRunManager(G4RunManagerType::Default);

  // Set mandatory initialization classes
  //
  runManager->SetUserInitialization(new B2a::DetectorConstruction());

  auto physicsList = new FTFP_BERT;
  physicsList->RegisterPhysics(new G4StepLimiterPhysics());
  runManager->SetUserInitialization(physicsList);

  // Set user action classes
  runManager->SetUserInitialization(new B2::ActionInitialization());

  // Initialize visualization with the default graphics system
  auto visManager = new G4VisExecutive(argc, argv);
  // Constructors can also take optional arguments:
  // - a graphics system of choice, eg. "OGL"
  // - and a verbosity argument - see /vis/verbose guidance.
  // auto visManager = new G4VisExecutive(argc, argv, "OGL", "Quiet");
  // auto visManager = new G4VisExecutive("Quiet");
  visManager->Initialize();

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

  // Process macro or start UI session
  //
  if ( ! ui ) {
    // batch mode
    G4String command = "/control/execute ";
    G4String fileName = argv[1];
    UImanager->ApplyCommand(command+fileName);
  }
  else {
    // interactive mode
    UImanager->ApplyCommand("/control/execute init_vis.mac");
    if (ui->IsGUI()) {
      UImanager->ApplyCommand("/control/execute gui.mac");
    }
    ui->SessionStart();
    delete ui;
  }

  // Job termination
  // Free the store: user actions, physics_list and detector_description are
  // owned and deleted by the run manager, so they should not be deleted
  // in the main() program !
  //
  delete visManager;
  delete runManager;
}

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