// Relative probability threshold, applied AFTER temperature. No word rules.
export function sampleCharacter(values, temperature, random, minP = 0) {
  if (!(temperature > 0) || !Number.isFinite(temperature)) throw new Error('Invalid temperature.');
  if (!(minP >= 0 && minP <= 1)) throw new Error('Seuil de tirage invalide.');
  const max = Math.max(...values);
  if (!Number.isFinite(max)) throw new Error('Logits non finis.');
  const probs = Array.from(values, v => Math.exp((v - max) / temperature));
  if (minP > 0) for (let j = 0; j < probs.length; j++) if (probs[j] < minP) probs[j] = 0;
  let r = random() * probs.reduce((a, b) => a + b, 0), choice = 0;
  for (let j = 0; j < probs.length; j++) {
    if (probs[j] === 0) continue;
    choice = j; // Rounding at the upper boundary must still choose a retained token.
    r -= probs[j]; if (r <= 0) break;
  }
  return choice;
}