/**
 * Returns the number of digits after the decimal point. Handles both the
 * normal decimal notation (`"0.25"`) and the exponential notation that JS
 * produces for very small magnitudes (`"1e-8"`).
 */
export function getDecimalPrecision(num) {
  if (num === 0) {
    return 0;
  }

  // Very small numbers (|num| < 1) get serialized as "1e-8", not "0.00000001".
  if (Math.abs(num) < 1) {
    const parts = num.toExponential().split("e-");
    // biome-ignore lint/style/noNonNullAssertion: `toExponential` always yields a mantissa
    const mantissaDecimalPart = parts[0].split(".")[1];
    return (mantissaDecimalPart ? mantissaDecimalPart.length : 0) +
    // biome-ignore lint/style/noNonNullAssertion: exponential form always has an exponent after "e-"
    Number.parseInt(parts[1], 10);
  }
  const decimalPart = num.toString().split(".")[1];
  return decimalPart ? decimalPart.length : 0;
}

/**
 * Rounds `value` to the nearest multiple of `step`, offset by `min` — so the
 * quantization grid is always anchored on `min`, not on `0`. The result is
 * then re-quantized via `toFixed(precision)` to trim binary-float drift.
 */
export function roundValueToStep(value, step, min) {
  const nearest = Math.round((value - min) / step) * step + min;
  return Number(nearest.toFixed(Math.max(getDecimalPrecision(step), getDecimalPrecision(min))));
}
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