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// $Id: G4PhysicsVector.icc 98864 2016-08-15 11:53:26Z gcosmo $
//
// 
//---------------------------------------------------------------
//      GEANT 4 class source file
//
//  G4PhysicsVector.icc
//
//  Description:
//    A physics vector which has values of energy-loss, cross-section, 
//    and other physics values of a particle in matter in a given 
//    range of the energy, momentum, etc.
//    This class serves as the base class for a vector having various 
//    energy scale, for example like 'log', 'linear', 'free', etc.
//
//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::operator[](const size_t index) const
{
  return  dataVector[index];
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::operator()(const size_t index) const
{
  return dataVector[index];
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::Energy(const size_t index) const
{
  return binVector[index];
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::GetMaxEnergy() const
{
  return edgeMax;
}

//---------------------------------------------------------------

inline 
 size_t G4PhysicsVector::GetVectorLength() const
{
  return numberOfNodes;
}

//------------------------------------------------

inline
 G4double G4PhysicsVector::LinearInterpolation(size_t idx, G4double e) const
{
  // Linear interpolation is used to get the value. Before this method
  // is called it is ensured that the energy is inside the bin
  // 0 < idx < numberOfNodes-1
  
  return dataVector[idx] +
         ( dataVector[idx + 1]-dataVector[idx] ) * (e - binVector[idx])
         /( binVector[idx + 1]-binVector[idx] );
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::SplineInterpolation(size_t idx, G4double e) const
{
  // Spline interpolation is used to get the value. Before this method
  // is called it is ensured that the energy is inside the bin
  // 0 < idx < numberOfNodes-1

  static const G4double onesixth = 1.0/6.0;

  // check bin value
  G4double x1 = binVector[idx];
  G4double x2 = binVector[idx + 1];
  G4double delta = x2 - x1;

  G4double a = (x2 - e)/delta;
  G4double b = (e - x1)/delta;
   
  // Final evaluation of cubic spline polynomial for return   
  G4double y1 = dataVector[idx];
  G4double y2 = dataVector[idx + 1];

  G4double res = a*y1 + b*y2 + 
        ( (a*a*a - a)*secDerivative[idx] +
          (b*b*b - b)*secDerivative[idx + 1] )*delta*delta*onesixth;

  return res;
}

//---------------------------------------------------------------

inline 
 G4double G4PhysicsVector::Interpolation(size_t idx, G4double e) const
{
  return useSpline ? SplineInterpolation(idx, e) : LinearInterpolation(idx, e);
}

//---------------------------------------------------------------

inline 
 void G4PhysicsVector::PutValue(size_t index, G4double theValue)
{
  if(index >= numberOfNodes) { PrintPutValueError(index); }  
  dataVector[index] = theValue;
}

//---------------------------------------------------------------

inline 
 G4bool G4PhysicsVector::IsFilledVectorExist() const
{
  return (numberOfNodes > 0) ? true : false;
}

//---------------------------------------------------------------

inline 
 G4PhysicsVectorType G4PhysicsVector::GetType() const
{
  return type;
}

//---------------------------------------------------------------

// Flag useSpline is "true" only if second derivatives are filled 
inline 
 void G4PhysicsVector::SetSpline(G4bool val)
{
  if(val) {
    if(0 == secDerivative.size() && 0 < dataVector.size()) { 
      FillSecondDerivatives(); 
    }
  } else {
    useSpline = false;
    secDerivative.clear();
  }
}

//---------------------------------------------------------------

inline
void G4PhysicsVector::SetVerboseLevel(G4int value)
{
   verboseLevel = value;
}

//---------------------------------------------------------------
/*
inline
G4int G4PhysicsVector::GetVerboseLevel() const 
{
   return verboseLevel;
}
*/
//---------------------------------------------------------------

inline 
size_t G4PhysicsVector::FindBinLocation(G4double theEnergy) const
{
   size_t bin;
   if(type == T_G4PhysicsLogVector) {
     bin = size_t(G4Log(theEnergy)/dBin - baseBin);
     if(bin > 0 && theEnergy < binVector[bin]) { --bin; }
     else if(theEnergy > binVector[bin+1]) { ++bin; }
   } else if(type == T_G4PhysicsLinearVector) {
     bin = size_t( theEnergy/dBin - baseBin ); 
     if(bin > 0 && theEnergy < binVector[bin]) { --bin; }
     else if(theEnergy > binVector[bin+1]) { ++bin; }
   } else {
     // Bin location proposed by K.Genser (FNAL)
     bin = std::lower_bound(binVector.begin(), binVector.end(), theEnergy)
         - binVector.begin() - 1;
   }
   return std::min(bin, numberOfNodes-2);
}

//---------------------------------------------------------------

inline size_t G4PhysicsVector::FindBin(G4double e, size_t idx) const
{
  size_t id = idx;
  if(e < binVector[1]) { 
    id = 0; 
  } else if(e >= binVector[numberOfNodes-2]) { 
    id = numberOfNodes - 2; 
  } else if(idx >= numberOfNodes || e < binVector[idx] 
            || e > binVector[idx+1]) { 
    id = FindBinLocation(e); 
  }
  return id;
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::Value(G4double theEnergy) const
{
  size_t idx=0;
  return Value(theEnergy, idx);
}

//---------------------------------------------------------------

inline
 G4double G4PhysicsVector::GetValue(G4double theEnergy, G4bool&) const 
{
  size_t idx=0;
  return Value(theEnergy, idx);
}

//---------------------------------------------------------------