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//
///////////////////////////////////////////////////////////////////////////////
//
// MODULE:        G4SPSRandomGenerator.cc
//
// Version:      1.0
// Date:         5/02/04
// Author:       Fan Lei 
// Organisation: QinetiQ ltd.
// Customer:     ESA/ESTEC
//
///////////////////////////////////////////////////////////////////////////////
//
// CHANGE HISTORY
// --------------
//
//
// Version 1.0, 05/02/2004, Fan Lei, Created.
//    Based on the G4GeneralParticleSource class in Geant4 v6.0
//
///////////////////////////////////////////////////////////////////////////////
//
#include "G4PrimaryParticle.hh"
#include "G4Event.hh"
#include "Randomize.hh"
#include <cmath>
#include "G4TransportationManager.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"
#include "G4IonTable.hh"
#include "G4Ions.hh"
#include "G4TrackingManager.hh"
#include "G4Track.hh"

#include "G4SPSRandomGenerator.hh"

//G4SPSRandomGenerator* G4SPSRandomGenerator::instance = 0;

G4SPSRandomGenerator::G4SPSRandomGenerator() {
	// Initialise all variables

	// Bias variables
	XBias = false;
	IPDFXBias = false;
	YBias = false;
	IPDFYBias = false;
	ZBias = false;
	IPDFZBias = false;
	ThetaBias = false;
	IPDFThetaBias = false;
	PhiBias = false;
	IPDFPhiBias = false;
	EnergyBias = false;
	IPDFEnergyBias = false;
	PosThetaBias = false;
	IPDFPosThetaBias = false;
	PosPhiBias = false;
	IPDFPosPhiBias = false;
	bweights[0] = bweights[1] = bweights[2] = bweights[3] = bweights[4]
			= bweights[5] = bweights[6] = bweights[7] = bweights[8] = 1.;
	verbosityLevel = 0;
}

G4SPSRandomGenerator::~G4SPSRandomGenerator() {
}

//G4SPSRandomGenerator* G4SPSRandomGenerator::getInstance ()
//{
//  if (instance == 0) instance = new G4SPSRandomGenerator();
//  return instance;
//}

// Biasing methods

void G4SPSRandomGenerator::SetXBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	XBiasH.InsertValues(ehi, val);
	XBias = true;
}

void G4SPSRandomGenerator::SetYBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	YBiasH.InsertValues(ehi, val);
	YBias = true;
}

void G4SPSRandomGenerator::SetZBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	ZBiasH.InsertValues(ehi, val);
	ZBias = true;
}

void G4SPSRandomGenerator::SetThetaBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	ThetaBiasH.InsertValues(ehi, val);
	ThetaBias = true;
}

void G4SPSRandomGenerator::SetPhiBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	PhiBiasH.InsertValues(ehi, val);
	PhiBias = true;
}

void G4SPSRandomGenerator::SetEnergyBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	EnergyBiasH.InsertValues(ehi, val);
	EnergyBias = true;
}

void G4SPSRandomGenerator::SetPosThetaBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	PosThetaBiasH.InsertValues(ehi, val);
	PosThetaBias = true;
}

void G4SPSRandomGenerator::SetPosPhiBias(G4ThreeVector input) {
	G4double ehi, val;
	ehi = input.x();
	val = input.y();
	PosPhiBiasH.InsertValues(ehi, val);
	PosPhiBias = true;
}

void G4SPSRandomGenerator::ReSetHist(G4String atype) {
	if (atype == "biasx") {
		XBias = false;
		IPDFXBias = false;
		XBiasH = IPDFXBiasH = ZeroPhysVector;
	} else if (atype == "biasy") {
		YBias = false;
		IPDFYBias = false;
		YBiasH = IPDFYBiasH = ZeroPhysVector;
	} else if (atype == "biasz") {
		ZBias = false;
		IPDFZBias = false;
		ZBiasH = IPDFZBiasH = ZeroPhysVector;
	} else if (atype == "biast") {
		ThetaBias = false;
		IPDFThetaBias = false;
		ThetaBiasH = IPDFThetaBiasH = ZeroPhysVector;
	} else if (atype == "biasp") {
		PhiBias = false;
		IPDFPhiBias = false;
		PhiBiasH = IPDFPhiBiasH = ZeroPhysVector;
	} else if (atype == "biase") {
		EnergyBias = false;
		IPDFEnergyBias = false;
		EnergyBiasH = IPDFEnergyBiasH = ZeroPhysVector;
	} else if (atype == "biaspt") {
		PosThetaBias = false;
		IPDFPosThetaBias = false;
		PosThetaBiasH = IPDFPosThetaBiasH = ZeroPhysVector;
	} else if (atype == "biaspp") {
		PosPhiBias = false;
		IPDFPosPhiBias = false;
		PosPhiBiasH = IPDFPosPhiBiasH = ZeroPhysVector;
	} else {
		G4cout << "Error, histtype not accepted " << G4endl;
	}
}

G4double G4SPSRandomGenerator::GenRandX() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandX" << G4endl;
	if (XBias == false) {
		// X is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// X is biased
		if (IPDFXBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(XBiasH.GetVectorLength());
			bins[0] = XBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = XBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = XBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = XBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + XBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFXBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFXBias = true
			IPDFXBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();

		// Calculate the weighting: Find the bin that the determined
		// rndm is in and the weigthing will be the difference in the
		// natural probability (from the x-axis) divided by the
		// difference in the biased probability (the area).
		size_t numberOfBin = IPDFXBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFXBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		// retrieve the areas and then the x-axis values
		bweights[0] = IPDFXBiasH(biasn2) - IPDFXBiasH(biasn2 - 1);
		G4double xaxisl = IPDFXBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFXBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		//G4cout << "X Bin weight " << bweights[0] << " " << rndm << G4endl;
		//G4cout << "lower and upper xaxis vals "<<xaxisl<<" "<<xaxisu<<G4endl;
		bweights[0] = NatProb / bweights[0];
		if (verbosityLevel >= 1)
			G4cout << "X bin weight " << bweights[0] << " " << rndm << G4endl;
		return (IPDFXBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandY() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandY" << G4endl;
	if (YBias == false) {
		// Y is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// Y is biased
		if (IPDFYBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(YBiasH.GetVectorLength());
			bins[0] = YBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = YBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = YBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = YBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + YBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFYBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFYBias = true
			IPDFYBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		size_t numberOfBin = IPDFYBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFYBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[1] = IPDFYBiasH(biasn2) - IPDFYBiasH(biasn2 - 1);
		G4double xaxisl = IPDFYBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFYBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[1] = NatProb / bweights[1];
		if (verbosityLevel >= 1)
			G4cout << "Y bin weight " << bweights[1] << " " << rndm << G4endl;
		return (IPDFYBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandZ() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandZ" << G4endl;
	if (ZBias == false) {
		// Z is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// Z is biased
		if (IPDFZBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(ZBiasH.GetVectorLength());
			bins[0] = ZBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = ZBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = ZBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = ZBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + ZBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFZBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFZBias = true
			IPDFZBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//      size_t weight_bin_no = IPDFZBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFZBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFZBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[2] = IPDFZBiasH(biasn2) - IPDFZBiasH(biasn2 - 1);
		G4double xaxisl = IPDFZBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFZBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[2] = NatProb / bweights[2];
		if (verbosityLevel >= 1)
			G4cout << "Z bin weight " << bweights[2] << " " << rndm << G4endl;
		return (IPDFZBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandTheta() {
	if (verbosityLevel >= 1) {
		G4cout << "In GenRandTheta" << G4endl;
		G4cout << "Verbosity " << verbosityLevel << G4endl;
	}
	if (ThetaBias == false) {
		// Theta is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// Theta is biased
		if (IPDFThetaBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(ThetaBiasH.GetVectorLength());
			bins[0] = ThetaBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = ThetaBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = ThetaBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = ThetaBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + ThetaBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFThetaBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFThetaBias = true
			IPDFThetaBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//      size_t weight_bin_no = IPDFThetaBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFThetaBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFThetaBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[3] = IPDFThetaBiasH(biasn2) - IPDFThetaBiasH(biasn2 - 1);
		G4double xaxisl = IPDFThetaBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFThetaBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[3] = NatProb / bweights[3];
		if (verbosityLevel >= 1)
			G4cout << "Theta bin weight " << bweights[3] << " " << rndm
					<< G4endl;
		return (IPDFThetaBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandPhi() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandPhi" << G4endl;
	if (PhiBias == false) {
		// Phi is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// Phi is biased
		if (IPDFPhiBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(PhiBiasH.GetVectorLength());
			bins[0] = PhiBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = PhiBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = PhiBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = PhiBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + PhiBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFPhiBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFPhiBias = true
			IPDFPhiBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//      size_t weight_bin_no = IPDFPhiBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFPhiBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFPhiBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[4] = IPDFPhiBiasH(biasn2) - IPDFPhiBiasH(biasn2 - 1);
		G4double xaxisl = IPDFPhiBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFPhiBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[4] = NatProb / bweights[4];
		if (verbosityLevel >= 1)
			G4cout << "Phi bin weight " << bweights[4] << " " << rndm << G4endl;
		return (IPDFPhiBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandEnergy() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandEnergy" << G4endl;
	if (EnergyBias == false) {
		// Energy is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// ENERGY is biased
		if (IPDFEnergyBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(EnergyBiasH.GetVectorLength());
			bins[0] = EnergyBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = EnergyBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = EnergyBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = EnergyBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + EnergyBiasH(size_t(ii));
			}
			IPDFEnergyBiasH = ZeroPhysVector;
			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFEnergyBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFEnergyBias = true
			IPDFEnergyBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//  size_t weight_bin_no = IPDFEnergyBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFEnergyBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFEnergyBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[5] = IPDFEnergyBiasH(biasn2) - IPDFEnergyBiasH(biasn2 - 1);
		G4double xaxisl = IPDFEnergyBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFEnergyBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[5] = NatProb / bweights[5];
		if (verbosityLevel >= 1)
			G4cout << "Energy bin weight " << bweights[5] << " " << rndm
					<< G4endl;
		return (IPDFEnergyBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandPosTheta() {
	if (verbosityLevel >= 1) {
		G4cout << "In GenRandPosTheta" << G4endl;
		G4cout << "Verbosity " << verbosityLevel << G4endl;
	}
	if (PosThetaBias == false) {
		// Theta is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// Theta is biased
		if (IPDFPosThetaBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(PosThetaBiasH.GetVectorLength());
			bins[0] = PosThetaBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = PosThetaBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = PosThetaBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = PosThetaBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + PosThetaBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFPosThetaBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFThetaBias = true
			IPDFPosThetaBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//      size_t weight_bin_no = IPDFThetaBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFPosThetaBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFPosThetaBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[6] = IPDFPosThetaBiasH(biasn2) - IPDFPosThetaBiasH(biasn2 - 1);
		G4double xaxisl =
				IPDFPosThetaBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFPosThetaBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[6] = NatProb / bweights[6];
		if (verbosityLevel >= 1)
			G4cout << "PosTheta bin weight " << bweights[6] << " " << rndm
					<< G4endl;
		return (IPDFPosThetaBiasH.GetEnergy(rndm));
	}
}

G4double G4SPSRandomGenerator::GenRandPosPhi() {
	if (verbosityLevel >= 1)
		G4cout << "In GenRandPosPhi" << G4endl;
	if (PosPhiBias == false) {
		// PosPhi is not biased
		G4double rndm = G4UniformRand();
		return (rndm);
	} else {
		// PosPhi is biased
		if (IPDFPosPhiBias == false) {
			// IPDF has not been created, so create it
			G4double bins[1024], vals[1024], sum;
			G4int ii;
			G4int maxbin = G4int(PosPhiBiasH.GetVectorLength());
			bins[0] = PosPhiBiasH.GetLowEdgeEnergy(size_t(0));
			vals[0] = PosPhiBiasH(size_t(0));
			sum = vals[0];
			for (ii = 1; ii < maxbin; ii++) {
				bins[ii] = PosPhiBiasH.GetLowEdgeEnergy(size_t(ii));
				vals[ii] = PosPhiBiasH(size_t(ii)) + vals[ii - 1];
				sum = sum + PosPhiBiasH(size_t(ii));
			}

			for (ii = 0; ii < maxbin; ii++) {
				vals[ii] = vals[ii] / sum;
				IPDFPosPhiBiasH.InsertValues(bins[ii], vals[ii]);
			}
			// Make IPDFPosPhiBias = true
			IPDFPosPhiBias = true;
		}
		// IPDF has been create so carry on
		G4double rndm = G4UniformRand();
		//      size_t weight_bin_no = IPDFPosPhiBiasH.FindValueBinLocation(rndm);
		size_t numberOfBin = IPDFPosPhiBiasH.GetVectorLength();
		G4int biasn1 = 0;
		G4int biasn2 = numberOfBin / 2;
		G4int biasn3 = numberOfBin - 1;
		while (biasn1 != biasn3 - 1) {
			if (rndm > IPDFPosPhiBiasH(biasn2))
				biasn1 = biasn2;
			else
				biasn3 = biasn2;
			biasn2 = biasn1 + (biasn3 - biasn1 + 1) / 2;
		}
		bweights[7] = IPDFPosPhiBiasH(biasn2) - IPDFPosPhiBiasH(biasn2 - 1);
		G4double xaxisl = IPDFPosPhiBiasH.GetLowEdgeEnergy(size_t(biasn2 - 1));
		G4double xaxisu = IPDFPosPhiBiasH.GetLowEdgeEnergy(size_t(biasn2));
		G4double NatProb = xaxisu - xaxisl;
		bweights[7] = NatProb / bweights[7];
		if (verbosityLevel >= 1)
			G4cout << "PosPhi bin weight " << bweights[7] << " " << rndm
					<< G4endl;
		return (IPDFPosPhiBiasH.GetEnergy(rndm));
	}
}