dim2k2006/project-lvl1-s450

import engine from '../engine';
import { getRandomInteger } from '../utils';

const description = 'Find the greatest common divisor of given numbers.';

/**
 * Finds greatest common divisor
 * @param {Number} num1
 * @param {Number} num2
 * @returns {Number}
 */
const getGcd = (num1, num2) => {
  let x = Math.abs(num1);
  let y = Math.abs(num2);

  while (y) {
    const t = y;
    y = x % y;
    x = t;
  }

  return x;
};

/**
 * Retrieves data needed for game
 * @returns {Object}
 */
const getData = () => {
  const num1 = getRandomInteger(1, 100);
  const num2 = getRandomInteger(1, 100);
  const question = `${num1} ${num2}`;
  const answer = String(getGcd(num1, num2));

  return { question, answer };
};

/**
 * Brain gcd game
 */
const gcd = () => engine(description, getData);

export default gcd;