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//
/// \file PhysicsList.cc
/// \brief Implementation of the PhysicsList class

#include "PhysicsList.hh"

#include "PhysListEmPolarized.hh"
#include "PhysicsListMessenger.hh"
#include "StepMax.hh"

#include "G4EmBuilder.hh"
#include "G4EmParameters.hh"
#include "G4EmStandardPhysics.hh"
#include "G4ProcessManager.hh"

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PhysicsList::PhysicsList()
  : G4VModularPhysicsList(), fEmPhysicsList(0), fEmName("polarized"), fMessenger(0)
{
  fMessenger = new PhysicsListMessenger(this);

  G4EmParameters::Instance();

  SetVerboseLevel(1);

  fEmPhysicsList = new PhysListEmPolarized();
}

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PhysicsList::~PhysicsList()
{
  delete fMessenger;
}

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void PhysicsList::ConstructParticle()
{
  // minimal set of particles for EM physics
  G4EmBuilder::ConstructMinimalEmSet();
}

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void PhysicsList::ConstructProcess()
{
  // Transportation
  //
  AddTransportation();

  // Electromagnetic physics list
  //
  fEmPhysicsList->ConstructProcess();

  // step limitation (as a full process)
  //
  AddStepMax();
}

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void PhysicsList::AddPhysicsList(const G4String& name)
{
  if (verboseLevel > 0) {
    G4cout << "PhysicsList::AddPhysicsList: <" << name << ">" << G4endl;
  }

  if (name == fEmName) return;

  if (name == "standard") {
    fEmName = name;
    delete fEmPhysicsList;
    fEmPhysicsList = new G4EmStandardPhysics();
  }
  else if (name == "polarized") {
    fEmName = name;
    delete fEmPhysicsList;
    fEmPhysicsList = new PhysListEmPolarized();
  }
  else {
    G4cout << "PhysicsList::AddPhysicsList: <" << name << ">"
           << " is not defined" << G4endl;
  }
}

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void PhysicsList::AddStepMax()
{
  // Step limitation seen as a process
  StepMax* stepMaxProcess = new StepMax();

  auto particleIterator = GetParticleIterator();
  particleIterator->reset();
  while ((*particleIterator)()) {
    G4ParticleDefinition* particle = particleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();

    if (stepMaxProcess->IsApplicable(*particle) && pmanager)
      pmanager->AddDiscreteProcess(stepMaxProcess);
  }
}

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