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//
//
/// \file exampleB4a.cc
/// \brief Main program of the B4a example

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

#include "G4RunManagerFactory.hh"
#include "G4SteppingVerbose.hh"
#include "G4UIcommand.hh"
#include "G4UImanager.hh"
#include "G4UIExecutive.hh"
#include "G4VisExecutive.hh"
#include "FTFP_BERT.hh"
#include "Randomize.hh"

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namespace {
  void PrintUsage() {
    G4cerr << " Usage: " << G4endl;
    G4cerr << " exampleB4a [-m macro ] [-u UIsession] [-t nThreads] [-vDefault]"
           << G4endl;
    G4cerr << "   note: -t option is available only for multi-threaded mode."
           << G4endl;
  }
}

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int main(int argc,char** argv)
{
  // Evaluate arguments
  //
  if ( argc > 7 ) {
    PrintUsage();
    return 1;
  }

  G4String macro;
  G4String session;
  G4bool verboseBestUnits = true;
#ifdef G4MULTITHREADED
  G4int nThreads = 0;
#endif
  for ( G4int i=1; i<argc; i=i+2 ) {
    if      ( G4String(argv[i]) == "-m" ) macro = argv[i+1];
    else if ( G4String(argv[i]) == "-u" ) session = argv[i+1];
#ifdef G4MULTITHREADED
    else if ( G4String(argv[i]) == "-t" ) {
      nThreads = G4UIcommand::ConvertToInt(argv[i+1]);
    }
#endif
    else if ( G4String(argv[i]) == "-vDefault" ) {
      verboseBestUnits = false;
      --i;  // this option is not followed with a parameter
    }
    else {
      PrintUsage();
      return 1;
    }
  }

  // Detect interactive mode (if no macro provided) and define UI session
  //
  G4UIExecutive* ui = nullptr;
  if ( ! macro.size() ) {
    ui = new G4UIExecutive(argc, argv, session);
  }

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

  // Use G4SteppingVerboseWithUnits
  if ( verboseBestUnits ) {
    G4int precision = 4;
    G4SteppingVerbose::UseBestUnit(precision);
  }

  // Construct the default run manager
  //
  auto* runManager =
    G4RunManagerFactory::CreateRunManager(G4RunManagerType::Default);
#ifdef G4MULTITHREADED
  if ( nThreads > 0 ) {
    runManager->SetNumberOfThreads(nThreads);
  }
#endif

  // Set mandatory initialization classes
  //
  auto detConstruction = new B4::DetectorConstruction();
  runManager->SetUserInitialization(detConstruction);

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

  auto actionInitialization = new B4a::ActionInitialization(detConstruction);
  runManager->SetUserInitialization(actionInitialization);

  // Initialize visualization
  //
  auto 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
  auto UImanager = G4UImanager::GetUIpointer();

  // Process macro or start UI session
  //
  if ( macro.size() ) {
    // batch mode
    G4String command = "/control/execute ";
    UImanager->ApplyCommand(command+macro);
  }
  else  {
    // interactive mode : define UI session
    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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