#ifndef G4EnergyLossForExtrapolator_h
#define G4EnergyLossForExtrapolator_h 1

//
// ********************************************************************
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// * GEANT4 collaboration.                                            *
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//
// $Id: G4EnergyLossForExtrapolator.hh,v 1.1 2005/04/08 14:00:17 vnivanch Exp $
// GEANT4 tag $Name: geant4-07-01 $
//
//---------------------------------------------------------------------------
//
// ClassName:    G4EnergyLossForExtrapolator
//  
// Description:  This class provide calculation of energy loss, fluctuation, 
//               and msc angle
//
// Author:       09.12.04 V.Ivanchenko 
//
// Modification: 
// 08-04-05 Rename Propogator -> Extrapolator
//
//----------------------------------------------------------------------------
//

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

class G4PhysicsTable;
class G4ParticleDefinition;
class G4Material;
class G4MaterialCutsCouple;
class G4ProductionCuts;

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class G4EnergyLossForExtrapolator 
{
public:
  G4EnergyLossForExtrapolator();
  ~G4EnergyLossForExtrapolator();

  G4double EnergyAfterStep(G4double kinEnergy, G4double step, 
			   const G4Material*, const G4ParticleDefinition* part);

  G4double EnergyAfterStep(G4double kinEnergy, G4double step, 
			   const G4Material*, const G4String& particleName);

  G4double EnergyBeforeStep(G4double kinEnergy, G4double step, 
			    const G4Material*, const G4ParticleDefinition* part);

  G4double EnergyBeforeStep(G4double kinEnergy, G4double step, 
			    const G4Material*, const G4String& particleName);

  G4double AverageScatteringAngle(G4double kinEnergy, G4double step, 
				  const G4Material*, const G4ParticleDefinition* part);

  G4double AverageScatteringAngle(G4double kinEnergy, G4double step, 
				  const G4Material*, const G4String& particleName);

  G4double EnergyDispersion(G4double kinEnergy, G4double step, 
			    const G4Material*, const G4ParticleDefinition* part);

  G4double EnergyDispertion(G4double kinEnergy, G4double step, 
			    const G4Material*, const G4String& particleName);

  G4double ComputeDEDX(G4double kinEnergy, const G4Material*, const G4ParticleDefinition* part);

  G4double ComputeRange(G4double kinEnergy, const G4Material*, const G4ParticleDefinition* part);

  G4double ComputeEnergy(G4double range, const G4Material*, const G4ParticleDefinition* part);

  void SetVerbose(G4int val) {verbose = val;};
   
private:

  void Initialisation();

  G4PhysicsTable* PrepareTable();

  const G4ParticleDefinition* FindParticle(const G4String& name);

  G4double ComputeValue(G4double x, const G4Material* mat, const G4PhysicsTable* table);

  void ComputeElectronDEDX(const G4ParticleDefinition* part, G4PhysicsTable* table); 

  void ComputeProtonDEDX(const G4ParticleDefinition* part, G4PhysicsTable* table); 

  const G4ParticleDefinition* currentParticle;
  const G4ParticleDefinition* electron;
  const G4ParticleDefinition* positron;
  const G4ParticleDefinition* proton;

  G4ProductionCuts*        cuts;
  std::vector<const G4MaterialCutsCouple*> couples;

  G4String currentParticleName;

  G4PhysicsTable*          dedxElectron;
  G4PhysicsTable*          dedxPositron;
  G4PhysicsTable*          dedxProton;
  G4PhysicsTable*          rangeElectron;
  G4PhysicsTable*          rangePositron;
  G4PhysicsTable*          rangeProton;
  G4PhysicsTable*          invRangeElectron;
  G4PhysicsTable*          invRangePositron;
  G4PhysicsTable*          invRangeProton;

  G4double    linLossLimit;
  G4double    emin;
  G4double    emax;
  G4int       nbins;
  G4int       nmat;
  G4int       verbose;
};

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inline G4double G4EnergyLossForExtrapolator::EnergyAfterStep(G4double kinEnergy, 
							     G4double step, 
							     const G4Material* mat, 
							     const G4String& name)
{
  return EnergyAfterStep(kinEnergy,step,mat,FindParticle(name));
}

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inline G4double G4EnergyLossForExtrapolator::EnergyBeforeStep(G4double kinEnergy, 
							      G4double step, 
							      const G4Material* mat, 
							      const G4String& name)
{
  return EnergyBeforeStep(kinEnergy,step,mat,FindParticle(name));
}

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inline G4double G4EnergyLossForExtrapolator::AverageScatteringAngle(G4double kinEnergy, 
								    G4double step, 
								    const G4Material* mat, 
								    const G4String& name)
{
  return AverageScatteringAngle(kinEnergy,step,mat,FindParticle(name));
}

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inline G4double G4EnergyLossForExtrapolator::EnergyDispertion(G4double kinEnergy, 
							      G4double step, 
							      const G4Material* mat, 
							      const G4String& name)
{
  return EnergyDispersion(kinEnergy,step,mat,FindParticle(name));
}

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#endif