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//
// neutron_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#include "G4ParticleHPField.hh"

#include "G4HadronicException.hh"
#include "G4ios.hh"

G4ParticleHPField::G4ParticleHPField()
{
  theData = new G4ParticleHPFieldPoint[100];
  nPoints = 100;
  nEntries = 0;
  theData->SetData(0, 0, 0);
}

G4ParticleHPField::~G4ParticleHPField()
{
  delete[] theData;
}

G4double G4ParticleHPField::GetY(G4double e, G4int j)
{
  G4int low = 0;
  G4int high = 0;
  G4int i;
  for (i = 1; i < nEntries / 10; i++) {
    if (theData[10 * i].GetX() > e) break;
  }
  if (i == (nEntries / 10)) {
    i = 10 * i;
    while (i < nEntries)  // Loop checking, 11.05.2015, T. Koi
    {
      if (theData[i++].GetX() > e) break;
    }
    if (i == nEntries) {
      low = nEntries - 1;
      high = nEntries - 2;
    }
    else {
      low = i - 1;
      high = i;
    }
  }
  else {
    for (G4int jj = 0; jj < 10; jj++) {
      if (theData[i].GetX() < e) break;
      i--;
    }
    low = i;
    high = i + 1;
  }
  G4double x1, x2, y1, y2, x, y;
  x = e;
  x1 = theData[low].GetX();
  x2 = theData[high].GetX();
  y1 = theData[low].GetY(j);
  y2 = theData[high].GetY(j);
  y = x * (y2 - y1) / (x2 - x1);
  return y += y2 - x2 * (y2 - y1) / (x2 - x1);
}

void G4ParticleHPField::Dump()
{
  G4cout << nEntries << G4endl;
  for (G4int i = 0; i < nEntries; ++i) {
    G4cout << theData[i].GetX() << " ";
    for (G4int j = 0; j < theData[i].GetDepth(); ++j) {
      G4cout << theData[i].GetY(j) << " ";
    }
    G4cout << G4endl;
  }
}

void G4ParticleHPField::Check(G4int i)
{
  if (i > nEntries)
    throw G4HadronicException(__FILE__, __LINE__,
                              "Skipped some index numbers in G4ParticleHPField");
  if (i == nPoints) {
    nPoints += 50;
    const std::size_t fsize = nPoints > 0 ? nPoints : 1;
    auto buff = new G4ParticleHPFieldPoint[fsize];
    for (G4int j = 0; j < nEntries; ++j) {
      buff[j] = theData[j];
    }
    delete[] theData;
    theData = buff;
  }
  if (i == nEntries) nEntries = i + 1;
}