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/// \file exampleGB06.cc
/// \brief Main program of the biasing/GB06 example

#include "FTFP_BERT.hh"
#include "GB06ActionInitialization.hh"
#include "GB06DetectorConstruction.hh"
#include "GB06ParallelWorldForSlices.hh"
#include "GB06PrimaryGeneratorAction.hh"

#include "G4GenericBiasingPhysics.hh"
#include "G4RunManagerFactory.hh"
#include "G4Types.hh"
#include "G4UIExecutive.hh"
#include "G4UImanager.hh"
#include "G4VisExecutive.hh"

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namespace
{
void PrintUsage()
{
  G4cerr << " Usage: " << G4endl;
  G4cerr << " ./exampleGB06 [-m macro ] "
         << " [-b biasing {'on','off'}]"
         << "\n or\n ./exampleGB06 [macro.mac]" << G4endl;
}
}  // namespace

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int main(int argc, char** argv)
{
  // Evaluate arguments
  //
  if (argc > 5) {
    PrintUsage();
    return 1;
  }

  G4String macro("");
  G4String onOffBiasing("");
  if (argc == 2)
    macro = argv[1];
  else {
    for (G4int i = 1; i < argc; i = i + 2) {
      if (G4String(argv[i]) == "-m")
        macro = argv[i + 1];
      else if (G4String(argv[i]) == "-b")
        onOffBiasing = argv[i + 1];
      else {
        PrintUsage();
        return 1;
      }
    }
  }

  if (onOffBiasing == "") onOffBiasing = "on";

  // Instantiate G4UIExecutive if interactive mode
  G4UIExecutive* ui = nullptr;
  if (macro == "") {
    ui = new G4UIExecutive(argc, argv);
  }

  // -- Construct the run manager : MT or sequential one
  auto* runManager = G4RunManagerFactory::CreateRunManager();
  runManager->SetNumberOfThreads(4);

  G4bool biasingFlag = (onOffBiasing == "on");

  // -- Set mandatory initialization classes

  // -- Create geometry:
  auto detector = new GB06DetectorConstruction();
  // -- Create parallel world:
  auto parallelWorld = new GB06ParallelWorldForSlices("parallelWorldForSlices", biasingFlag);
  // -- and "augment" detector geometry with the parallelWorld one:
  detector->RegisterParallelWorld(parallelWorld);
  runManager->SetUserInitialization(detector);

  // -- Select a physics list:
  auto physicsList = new FTFP_BERT;
  if (biasingFlag) {
    // -- and augment it with biasing facilities:
    auto biasingPhysics = new G4GenericBiasingPhysics();
    biasingPhysics->BeVerbose();
    // -- We use only the "non physics biasing" functionnality (ie, the ones which don't
    // -- alter physics processes behavior), and hence we equipe the physics list
    // -- accordingly:
    biasingPhysics->NonPhysicsBias("neutron");
    // -- we activate and configure the parallel geometry facility:
    biasingPhysics->AddParallelGeometry("neutron", "parallelWorldForSlices");
    physicsList->RegisterPhysics(biasingPhysics);
    G4cout << "      ********************************************************* " << G4endl;
    G4cout << "      ********** processes are wrapped for biasing ************ " << G4endl;
    G4cout << "      ********************************************************* " << G4endl;
  }
  else {
    G4cout << "      ************************************************* " << G4endl;
    G4cout << "      ********** processes are not wrapped ************ " << G4endl;
    G4cout << "      ************************************************* " << G4endl;
  }
  runManager->SetUserInitialization(physicsList);

  // -- Action initialization:
  runManager->SetUserInitialization(new GB06ActionInitialization);

  // Initialize G4 kernel
  runManager->Initialize();

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

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

  if (macro != "")  // batch mode
  {
    G4String command = "/control/execute ";
    UImanager->ApplyCommand(command + macro);
  }
  else {  // interactive mode : define UI session
    UImanager->ApplyCommand("/control/execute vis.mac");
    //      if (ui->IsGUI())
    //              UImanager->ApplyCommand("/control/execute gui.mac");
    ui->SessionStart();
    delete ui;
  }

  delete visManager;
  delete runManager;

  return 0;
}

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