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/////////////////////////////////////////////////////////////////////////////////
//      Class Name:	G4AdjointPrimaryGeneratorAction
//	Author:       	L. Desorgher
// 	Organisation: 	SpaceIT GmbH
//	Contract:	ESA contract 21435/08/NL/AT
// 	Customer:     	ESA/ESTEC
/////////////////////////////////////////////////////////////////////////////////
//
// CHANGE HISTORY
// --------------
//      ChangeHistory:
//	 	10-01-2007 creation by L. Desorgher
//		1-11-2009 Splitting of G4AdjointPrimaryGeneratorAction in two classes
//      G4AdjointPrimaryGeneratorAction and G4AdjointPrimaryGenerator
//      L.Desorgher
//
//
//-------------------------------------------------------------
//	Documentation:
//		This class represents the PrimaryGeneratorAction that is used during the
//entire
// adjoint simulation. 		It uses the class G4AdjointPrimaryGenerator to
// generate randomly adjoint primary particles on a user selected 		adjoint
// source (External surface of a volume or Sphere). 		The spectrum of the
// primary  adjoint particles is set as 1/E with user defined max and min
// energy. 		The weight of the primary is set according to ReverseMC theory as
// w=log(Emax/Emin)*E*adjoint_source_area*pi/n, with E the energy of the
// particle, n the number of adjoint primary particles of same type that will be
// generated during the simulation. 		Different types of adjoint particles are
// generated event after event in order 		to cover all the type of primaries
// and secondaries needed for the simulation. For example if reverse e-
// ionisation, brem, photo
// electric effect, and 		compton are considered both adjoint gamma and adjoint
// e- will be considered alternatively as adjoint primary. 		The user can
// decide to consider/neglect some type of particle by using the macro commands
// /adjoint/ConsiderAsPrimary and
/// adjoint/NeglectAsPrimary. If  an adjoint primary or its secondary has
/// reached the
// external surface, 		in the next event a fwd primary particle equivalent to
// the last generated adjoint primary is generated with the same position,
// energy but opposite direction 		and the forward tracking phase starts.
//
//
//
#ifndef G4AdjointPrimaryGeneratorAction_h
#define G4AdjointPrimaryGeneratorAction_h 1
#include "G4ThreeVector.hh"
#include "G4VUserPrimaryGeneratorAction.hh"
#include "globals.hh"
#include <iterator>
#include <map>
#include <vector>

class G4AdjointPosOnPhysVolGenerator;
class G4ParticleGun;
class G4Event;
class G4AdjointPrimaryGenerator;
class G4ParticleDefinition;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
class G4AdjointPrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
{
 public:  // constructor, destructor
  G4AdjointPrimaryGeneratorAction();
  ~G4AdjointPrimaryGeneratorAction();

 public:  // public methods
  void GeneratePrimaries(G4Event*);
  void SetRndmFlag(const G4String& val) { rndmFlag = val; }
  void SetEmin(G4double val);
  void SetEmax(G4double val);
  void SetEminIon(G4double val);
  void SetEmaxIon(G4double val);
  void SetSphericalAdjointPrimarySource(G4double radius, G4ThreeVector pos);
  void SetAdjointPrimarySourceOnAnExtSurfaceOfAVolume(
    const G4String& volume_name);
  void ConsiderParticleAsPrimary(const G4String& particle_name);
  void NeglectParticleAsPrimary(const G4String& particle_name);
  void SetPrimaryIon(G4ParticleDefinition* adjointIon,
                     G4ParticleDefinition* fwdIon);
  void UpdateListOfPrimaryParticles();
  inline size_t GetNbOfAdjointPrimaryTypes()
  {
    return ListOfPrimaryAdjParticles.size();
  }
  inline std::vector<G4ParticleDefinition*>* GetListOfPrimaryFwdParticles()
  {
    return &ListOfPrimaryFwdParticles;
  }
  inline const G4String& GetPrimaryIonName() { return ion_name; }
  inline void SetNbPrimaryFwdGammasPerEvent(G4int nb)
  {
    nb_fwd_gammas_per_event = nb;
  }
  inline void SetNbAdjointPrimaryGammasPerEvent(G4int nb)
  {
    nb_adj_primary_gammas_per_event = nb;
  }
  inline void SetNbAdjointPrimaryElectronsPerEvent(G4int nb)
  {
    nb_adj_primary_electrons_per_event = nb;
  }
  inline G4ParticleDefinition* GetLastGeneratedFwdPrimaryParticle()
  {
    return ListOfPrimaryFwdParticles[index_particle];
  }

 private:  // private methods
  G4double ComputeEnergyDistWeight(G4double energy, G4double E1, G4double E2);

 private:             // attributes
  G4String rndmFlag;  // flag for a rndm impact point

  // The generator of primary vertex except for weight
  G4AdjointPrimaryGenerator* theAdjointPrimaryGenerator;

  // Emin and Emax energies of the adjoint source
  //---------------------------------------------
  G4double Emin;
  G4double Emax;
  G4double EminIon;
  G4double EmaxIon;

  // List of type of primary adjoint and forward  particle used in the
  // simulation
  //---------------------------------------------------------------------------
  std::vector<G4ParticleDefinition*> ListOfPrimaryFwdParticles;
  std::vector<G4ParticleDefinition*> ListOfPrimaryAdjParticles;
  std::map<G4String, G4bool>
    PrimariesConsideredInAdjointSim;  // if true considered if
                                      // false not considered

  size_t index_particle;

  G4ThreeVector pos, direction, p;

  G4String type_of_adjoint_source;  // Spherical ExtSurfaceOfAVolume
  G4double radius_spherical_source;
  G4ThreeVector center_spherical_source;
  G4int nb_fwd_gammas_per_event;
  G4int nb_adj_primary_gammas_per_event;
  G4int nb_adj_primary_electrons_per_event;

  // For simulation with ions
  //--------------------------
  G4ParticleDefinition* fwd_ion;
  G4ParticleDefinition* adj_ion;
  G4String ion_name;
  // disable copy constructor and assignement operator
  G4AdjointPrimaryGeneratorAction(const G4AdjointPrimaryGeneratorAction&);
  G4AdjointPrimaryGeneratorAction& operator=(
    const G4AdjointPrimaryGeneratorAction&);
};
#endif