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//
//--------------------------------------------------------------------------
//
// G4BiasingProcessSharedData
//
// Class Description:
//        This class represents the data that the G4BiasingProcessInterface
//    objects attached to a same particle / hold by a same G4ProcessManager
//    share. It allows the active G4BiasingProcessInterface objects to share
//    information on operations that are common the these instances:
//        - the current and previous G4VBiasingOperator objects (their
//          pointers are collected once, at the beginning of the PostStepGPIL
//          by the first interface invoked)
//        - add the list of cooperating G4BiasingProcessInterface objects,
//          acting on a same particle type.
//        G4BiasingProcessInterface is friend class of this one.
//---------------------------------------------------------------------------
//   Initial version                         Sep. 2014 M. Verderi

#ifndef G4BiasingProcessSharedData_h
#define G4BiasingProcessSharedData_h

#include "globals.hh"
#include "G4Cache.hh"
#include <vector>

class G4VBiasingOperator;
class G4BiasingProcessInterface;
class G4ProcessManager;
class G4ParallelGeometriesLimiterProcess;

class G4BiasingProcessSharedData {

friend class G4BiasingProcessInterface;
friend class G4ParallelGeometriesLimiterProcess;

public:
  // -------------------------
  // -- Public access methods:
  // -------------------------
  // -- The biasing process interface objects sharing this shared data class:
  const std::vector< const G4BiasingProcessInterface* >&           GetBiasingProcessInterfaces() const
  { return           fPublicBiasingProcessInterfaces; }
  const std::vector< const G4BiasingProcessInterface* >&    GetPhysicsBiasingProcessInterfaces() const
  { return    fPublicPhysicsBiasingProcessInterfaces; }
  const std::vector< const G4BiasingProcessInterface* >& GetNonPhysicsBiasingProcessInterfaces() const
  { return fPublicNonPhysicsBiasingProcessInterfaces; }
  
  // -- The possible geometry limiter process:
  const G4ParallelGeometriesLimiterProcess*                GetParallelGeometriesLimiterProcess() const
  { return fParallelGeometriesLimiterProcess; }
  

private:
  // -- Methods used by the G4BiasingProcessInterface objects, thanks to class friendness.
  // -- Object is created by G4BiasingProcessInterface object:
  G4BiasingProcessSharedData( const G4ProcessManager* mgr)
    : fProcessManager                  (mgr),
      fCurrentBiasingOperator          ( nullptr ),
      fPreviousBiasingOperator         ( nullptr ),
      fParallelGeometryOperator        ( nullptr ),
      fMassGeometryOperator            ( nullptr ),
      fIsNewOperator                   (true),
      fLeavingPreviousOperator         (false),
      fParallelGeometriesLimiterProcess( nullptr )
  {}
  ~G4BiasingProcessSharedData() {}
  // -- biasing operators:
  void                 CurrentBiasingOperator( G4VBiasingOperator* );
  G4VBiasingOperator*  CurrentBiasingOperator() const;
  void                PreviousBiasingOperator( G4VBiasingOperator* );
  G4VBiasingOperator* PreviousBiasingOperator() const;

private:
  // -- 
  const G4ProcessManager* fProcessManager;
  // -- biasing operators:
  G4VBiasingOperator*   fCurrentBiasingOperator;
  G4VBiasingOperator*  fPreviousBiasingOperator;
  G4VBiasingOperator* fParallelGeometryOperator;
  G4VBiasingOperator*     fMassGeometryOperator;
  // -- 
  G4bool                         fIsNewOperator;
  G4bool               fLeavingPreviousOperator;

  // -- biasing process interfaces sharing this object:
  std::vector < G4BiasingProcessInterface* >                       fBiasingProcessInterfaces;
  std::vector < G4BiasingProcessInterface* >                fPhysicsBiasingProcessInterfaces;
  std::vector < G4BiasingProcessInterface* >             fNonPhysicsBiasingProcessInterfaces;
  // -- the same ones, for public use:
  std::vector < const G4BiasingProcessInterface* >           fPublicBiasingProcessInterfaces;
  std::vector < const G4BiasingProcessInterface* >    fPublicPhysicsBiasingProcessInterfaces;
  std::vector < const G4BiasingProcessInterface* > fPublicNonPhysicsBiasingProcessInterfaces;

  // -- possible process limiting step on parallel geometries:
  G4ParallelGeometriesLimiterProcess*                      fParallelGeometriesLimiterProcess;

  
  // -- thread local:
  // -- Map between process managers and shared data. This map is made of
  // -- pointers of G4BiasingSharedData instead of objects themselves :
  // -- each process needs to keep a valid pointer of a shared data object
  // -- but a map of object will make pointers invalid when map is increased.
  static G4MapCache< const G4ProcessManager*, 
		     G4BiasingProcessSharedData* >         fSharedDataMap;

};

#endif