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//
// G4UserWorkerThreadInitialization implementation
//
// Authors: M.Asai, A.Dotti (SLAC), 16 September 2013
// --------------------------------------------------------------------

#include "G4UserWorkerThreadInitialization.hh"

#include "G4AutoLock.hh"
#include "G4MTRunManagerKernel.hh"
#include "G4UImanager.hh"
#include "G4VUserActionInitialization.hh"
#include "G4VUserPhysicsList.hh"
#include "G4WorkerRunManager.hh"
#include "G4WorkerThread.hh"

#include <sstream>

// --------------------------------------------------------------------
#ifdef G4MULTITHREADED
G4Thread* G4UserWorkerThreadInitialization::CreateAndStartWorker(G4WorkerThread* wTC)
{
  // Note: this method is called by G4MTRunManager,
  // here we are still sequential.
  // Create a new thread/worker structure
  auto worker = new G4Thread;
  G4THREADCREATE(worker, &G4MTRunManagerKernel::StartThread, wTC);
  return worker;
}
#else
G4Thread* G4UserWorkerThreadInitialization::CreateAndStartWorker(G4WorkerThread*)
{
  return new G4Thread;
}
#endif

// --------------------------------------------------------------------
#ifdef G4MULTITHREADED
void G4UserWorkerThreadInitialization::JoinWorker(G4Thread* aThread)
{
  G4THREADJOIN(*aThread);
}
#else  // Avoid compilation warning in sequential
void G4UserWorkerThreadInitialization::JoinWorker(G4Thread*) {}
#endif

// --------------------------------------------------------------------
namespace
{
G4Mutex rngCreateMutex = G4MUTEX_INITIALIZER;
}

// --------------------------------------------------------------------
void G4UserWorkerThreadInitialization::SetupRNGEngine(const CLHEP::HepRandomEngine* aNewRNG) const
{
  G4AutoLock l(&rngCreateMutex);
  // No default available, let's create the instance of random stuff
  // A Call to this just forces the creation to defaults
  G4Random::getTheEngine();
  // Poor man's solution to check which RNG Engine is used in master thread
  CLHEP::HepRandomEngine* retRNG = nullptr;

  // Need to make these calls thread safe
  if (dynamic_cast<const CLHEP::HepJamesRandom*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::HepJamesRandom;
  }
  else if (dynamic_cast<const CLHEP::MixMaxRng*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::MixMaxRng;
  }
  else if (dynamic_cast<const CLHEP::RanecuEngine*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::RanecuEngine;
  }
  else if (dynamic_cast<const CLHEP::RanluxppEngine*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::RanluxppEngine;
  }
  else if (dynamic_cast<const CLHEP::Ranlux64Engine*>(aNewRNG) != nullptr) {
    const auto theRNG = dynamic_cast<const CLHEP::Ranlux64Engine*>(aNewRNG);
    retRNG = new CLHEP::Ranlux64Engine(123, theRNG->getLuxury());
  }
  else if (dynamic_cast<const CLHEP::MTwistEngine*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::MTwistEngine;
  }
  else if (dynamic_cast<const CLHEP::DualRand*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::DualRand;
  }
  else if (dynamic_cast<const CLHEP::RanluxEngine*>(aNewRNG) != nullptr) {
    const auto theRNG = dynamic_cast<const CLHEP::RanluxEngine*>(aNewRNG);
    retRNG = new CLHEP::RanluxEngine(123, theRNG->getLuxury());
  }
  else if (dynamic_cast<const CLHEP::RanshiEngine*>(aNewRNG) != nullptr) {
    retRNG = new CLHEP::RanshiEngine;
  }

  if (retRNG != nullptr) {
    G4Random::setTheEngine(retRNG);
  }
  else {
    // Does a new method, such as aNewRng->newEngine() exist to clone it ?
    G4ExceptionDescription msg;
    msg << " Unknown type of RNG Engine - " << G4endl
        << " Can cope only with HepJamesRandom, MixMaxRng, Ranecu, Ranlux64,"
        << " Ranlux++, MTwistEngine, DualRand, Ranlux or Ranshi." << G4endl
        << " Cannot clone this type of RNG engine, as required for this thread" << G4endl
        << " Aborting " << G4endl;
    G4Exception("G4UserWorkerThreadInitialization::SetupRNGEngine()", "Run0122", FatalException,
                msg);
  }
}

// --------------------------------------------------------------------
G4WorkerRunManager* G4UserWorkerThreadInitialization::CreateWorkerRunManager() const
{
  return new G4WorkerRunManager();
}