// https://gist.github.com/tkrotoff/f3f36926edeeb3f4ce4411151bde37b2

// Exported for testing purposes only
// https://stackoverflow.com/a/45736131
export function getNumberWithDecimalPlaces(num: number, decimalPlaces: number) {
  const power = 10 ** decimalPlaces;
  return Math.floor(num * power) / power;
}

type GetRandomNumberOptions = {
  /**
   * The number of digits to appear after the decimal point.
   * https://ell.stackexchange.com/q/141863
   */
  decimalPlaces?: number;
};

/**
 * Generates a pseudo-random float (0.3546, 5.8557...) between min (included) and max (excluded).
 */
export function getRandomFloat(min: number, max: number, options: GetRandomNumberOptions = {}) {
  const { decimalPlaces } = options;

  const num = Math.random() * (max - min) + min;

  if (decimalPlaces === undefined) {
    return num;
  }

  return getNumberWithDecimalPlaces(num, decimalPlaces);
}

/**
 * Generates a pseudo-random integer (0, 6...) between min (included) and max (included).
 */
export function getRandomInt(min: number, max: number) {
  // https://stackoverflow.com/a/7228322
  return Math.floor(Math.random() * (max - min + 1)) + min;
}