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// $Id$
//
//      ---------------- G4QDiscProcessMixer header ----------------
//                 by Mikhail Kossov, Aug 2007.
//  Header of G4QDiscProcessMixer class of the CHIPS Simulation Branch in GEANT4
// -----------------------------------------------------------------------------
// Short description: universal mixer of processes (NOT models as in GHAD!)
// depending on the application energy region (defined by users).
// ------------------------------------------------------------------------

#ifndef G4QDiscProcessMixer_hh
#define G4QDiscProcessMixer_hh

// GEANT4 Headers
#include "globals.hh"
#include "G4ios.hh"
#include "Randomize.hh" 
#include "G4VDiscreteProcess.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4ParticleDefinition.hh"
#include "G4Gamma.hh"
#include "G4DynamicParticle.hh"
#include "G4QDiscreteProcessVector.hh"

#include <vector>

class G4QDiscProcessMixer : public G4VDiscreteProcess
{
public:

  // Constructor
  G4QDiscProcessMixer(const G4String& processName = "Mixed Discrete Process",
                      const G4ParticleDefinition* proj = G4Gamma::Gamma(),
                      G4ProcessType pType = fHadronic );
  // Destructor
  ~G4QDiscProcessMixer();

  G4bool IsApplicable(const G4ParticleDefinition& particle);

  G4double PostStepGetPhysicalInteractionLength(const G4Track& track,
                                                G4double previousStepSize,
                                                G4ForceCondition* condition);

  G4double GetMeanFreePath(const G4Track& aTrack, G4double previousStepSize,
                           G4ForceCondition* condition);

  G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep); 

  // DP is the name of the Discrete Process, MaxE is the maximum energy for this process
  // The processes must be defined, starting from high energy processes (MaxE decreasing)
  // The MaxE for the first (highest energy process) is always infinity (automatic)
  // The MinE = MaxE of the lower energy process (MinE=0 for the lowest energy process)

  void AddDiscreteProcess(G4VDiscreteProcess* DP, G4double MaxE);

  //G4LorentzVector GetEnegryMomentumConservation();

  //G4int GetNumberOfNeutronsInTarget();

private:

  // Hide assignment operator as private 
  G4QDiscProcessMixer& operator=(const G4QDiscProcessMixer &right);

  // Copy constructor
  G4QDiscProcessMixer(const G4QDiscProcessMixer& DPM);

  // BODY
  const G4ParticleDefinition* DPParticle;             // Particle for DiscreteProc mixture
  G4QDiscreteProcessVector theDPVector;               // Vector of Discrete Processes
  //G4LorentzVector EnMomConservation;                // Residual of Energy/Momentum Cons.
  //G4int nOfNeutrons;                                // #of neutrons in the target nucleus
};
#endif