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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 G4ITReactionChange_H
#define G4ITReactionChange_H

#include "globals.hh"
#include "G4ParticleChange.hh"
#include "G4TrackFastVector.hh"

/** Similar to G4ParticleChange, but deal with two tracks
  * rather than one.
  */

class G4ITReactionChange
{
public:
    /** Default constructor */
    G4ITReactionChange();
    /** Default destructor */
    virtual ~G4ITReactionChange();

    //_____________________________________________________
    // To be used by reaction processes
    void Initialize(const G4Track&,
                    const G4Track&,
                    G4VParticleChange* particleChangeA = 0,
                    G4VParticleChange* particleChangeB = 0
                    ) ;
    void AddSecondary(G4Track* aSecondary);
    inline void KillParents(G4bool);

    // If both parents are not killed therefore
    // we can used the particle change
    // you will have to give the pointers
    // of your particleChange while intializing
    // but it might tell you that energy is not
    // conserved for instance
    G4VParticleChange* GetParticleChange(const G4Track*);

    //_____________________________________________________
    // Not to be used in reaction processes
    void UpdateStepInfo(G4Step*, G4Step*);
    G4Track* GetSecondary(G4int) const;
    G4TrackFastVector* GetfSecondary() ;

    G4int GetNumberOfSecondaries() const;
    G4bool WereParentsKilled() const;

    const G4Track* GetTrackA();
    const G4Track* GetTrackB();

protected:
    /** Copy constructor
     *  \param other Object to copy from
     */
    G4ITReactionChange(const G4ITReactionChange& other);
    /** Assignment operator
     *  \param other Object to assign from
     *  \return A reference to this
     */
    G4ITReactionChange& operator=(const G4ITReactionChange& other);
    // equal/unequal operator
    G4bool operator==(const G4ITReactionChange &right) const;
    G4bool operator!=(const G4ITReactionChange &right) const;
    // "equal" means that the objects have the same pointer.
protected:
    std::map<const G4Track*, G4VParticleChange*> fParticleChange;
    G4TrackFastVector* fSecondaries ;
    G4int fNumberOfSecondaries;
    G4bool fKillParents ;
    G4bool fParticleChangeIsSet;
};

inline G4Track* G4ITReactionChange::GetSecondary(G4int anIndex) const
{
    return (*fSecondaries)[anIndex];
}

inline G4int G4ITReactionChange::GetNumberOfSecondaries() const
{
    return fNumberOfSecondaries;
}

inline void G4ITReactionChange::KillParents(G4bool kill)
{
    fKillParents = kill;
}

inline G4bool G4ITReactionChange::WereParentsKilled() const
{
    return fKillParents ;
}

inline G4TrackFastVector* G4ITReactionChange::GetfSecondary()
{
    return fSecondaries;
}

#endif // G4ITReactionChange_H