drytikov/project-lvl1-s128

import runGame from '..';
import random from '../utils';

const description = 'Balance the given number.';

const getCorrectAnswer = (num) => {
  const balance = (arrDigitsOfNum, minDigit, indexMin, maxDigit, indexMax) => {
    const curArrDigitsOfNum = arrDigitsOfNum;
    if ((maxDigit - minDigit) < 2) {
      curArrDigitsOfNum[indexMax] = maxDigit;
      curArrDigitsOfNum[indexMin] = minDigit;
      return getCorrectAnswer(curArrDigitsOfNum.sort((a, b) => a - b).join(''));
    }
    return balance(arrDigitsOfNum, minDigit + 1, indexMin, maxDigit - 1, indexMax);
  };
  const numAsStr = String(num);
  const arrDigitsOfNum = numAsStr.split('').map(item => Number(item));
  const minDigit = Math.min.apply(null, arrDigitsOfNum);
  const maxDigit = Math.max.apply(null, arrDigitsOfNum);
  if ((maxDigit - minDigit) < 2) {
    return String(num);
  }
  const indexMin = arrDigitsOfNum.indexOf(minDigit);
  const indexMax = arrDigitsOfNum.indexOf(maxDigit);
  return balance(arrDigitsOfNum, minDigit, indexMin, maxDigit, indexMax);
};

const getInputParams = () => {
  const num = random(1000);
  const correctAnswer = getCorrectAnswer(num);
  return {
    question: num,
    correctAnswer,
  };
};

export default userName => runGame(userName, description, getInputParams);