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//
// Author: Mathieu Karamitros (kara (AT) cenbg . in2p3 . fr) 
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------
#ifndef G4VITTimeStepper_H
#define G4VITTimeStepper_H

#include "G4Track.hh"
#include "G4ITReactionTable.hh"
#include "G4ReferenceCountedHandle.hh"
#include "AddClone_def.hh"

typedef G4ReferenceCountedHandle< std::vector<G4Track*> > G4TrackVectorHandle;

/**
  * Before stepping all tracks G4ITStepManager calls all the G4VITModel
  * which may contain a G4VITTimeStepper (optionnal).
  * G4VITTimeStepper returns what should be the next global time step.
  * Time step that will be used to step all tracks.
  */

class G4VITTimeStepper
{
public:
    G4VITTimeStepper();
    virtual ~G4VITTimeStepper();

    G4VITTimeStepper(const G4VITTimeStepper&);
    G4VITTimeStepper& operator=(const G4VITTimeStepper& other);

    /** This macro defined in AddClone_def **/
    G4IT_TO_BE_CLONED(G4VITTimeStepper)

    // First initialization (done once for all at the begin of the run)
    // eg. check if the reaction table is given ...
    inline virtual void Initialize(){;}

    // Preparation part
    static void SetTimes(const G4double&, const G4double&);
    inline virtual void PrepareForAllProcessors(){;}
    inline virtual void Prepare() ;

    virtual G4double CalculateStep(const G4Track&, const G4double&) = 0;

    inline G4TrackVectorHandle GetReactants();
    inline virtual void ResetReactants(){fReactants = 0;}

    //
    inline G4double GetSampledMinTimeStep() ;
    
    inline void SetReactionTable(const G4ITReactionTable*);
    inline const G4ITReactionTable* GetReactionTable();

protected :
    static G4double fCurrentGlobalTime ;
    static G4double fUserMinTimeStep   ;

    G4double fSampledMinTimeStep ;
    G4TrackVectorHandle fReactants;

    const G4ITReactionTable* fReactionTable;

private:
    G4int fVerbose ;
};

inline void G4VITTimeStepper::SetReactionTable(const G4ITReactionTable* table)
{
    fReactionTable = table;
}

inline const G4ITReactionTable* G4VITTimeStepper::GetReactionTable()
{
    return fReactionTable ;
}

inline void G4VITTimeStepper::Prepare()
{
    fReactants = 0 ;
}

inline G4double G4VITTimeStepper::GetSampledMinTimeStep()
{
    return fSampledMinTimeStep ;
}

inline G4TrackVectorHandle G4VITTimeStepper::GetReactants()
{
    return  fReactants ;
}
#endif // G4VITTimeStepper_H