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/// \file pythia6_decayer.cc
/// \brief Main program of the pythia/decayer6 example

#include "DetectorConstruction.hh"
#include "GunPrimaryGeneratorAction.hh"
#include "P6DExtDecayerPhysics.hh"
#include "QGSP_BERT.hh"

#include "G4RunManagerFactory.hh"
#include "G4SystemOfUnits.hh"
#include "G4ThreeVector.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"
#include "Randomize.hh"

int main(int argc, char** argv)
{
  // Detect interactive mode (if no arguments) and define UI session
  //
  G4UIExecutive* ui = 0;
  if (argc == 1) {
    ui = new G4UIExecutive(argc, argv);
  }

  // Choose the Random engine
  //
  G4Random::setTheEngine(new CLHEP::RanecuEngine);

  // Construct a serial run manager
  //
  auto* runManager = G4RunManagerFactory::CreateRunManager(G4RunManagerType::SerialOnly);

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

  //
  G4VModularPhysicsList* physicsList = new QGSP_BERT;
  physicsList->RegisterPhysics(new P6DExtDecayerPhysics());
  runManager->SetUserInitialization(physicsList);

  // Set user action classes
  //
  runManager->SetUserAction(new Common::GunPrimaryGeneratorAction("B-", 50. * MeV));
  // B- meson has not defined decay in Geant4

  // Initialize visualization
  //
  G4VisManager* visManager = new G4VisExecutive;
  // G4VisExecutive can take a verbosity argument - see /vis/verbose guidance.
  // G4VisManager* visManager = new G4VisExecutive("Quiet");
  visManager->Initialize();

  // Get the pointer to the User Interface manager
  G4UImanager* 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");
    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;
}