augrinn/project-lvl1-s442

import { startGame } from '..';
import { cons } from 'hexlet-pairs';
import getRandomInt from '../utils';

const description = 'What number is missing in the progression?';

const lengthProgression = 10;

const minStartProgression = 0;

const maxStartProgression = 5;

const minDiffProgression = 2;

const maxDiffProgression = 9;

const getQuestion = (start, diffProgression, indexMissingNumber) => {
  const iter = (count, curentNumber, acc) => {
    if (count > lengthProgression) {
      return acc;
    }
    const newNumber = curentNumber + diffProgression;
    return iter(count + 1, newNumber, `${acc} ${count === indexMissingNumber ? '..' : curentNumber}`);
  };
  const question = iter(1, start, '');
  return question.trim();
};

const getDataQuestion = () => {
  const startProgression = getRandomInt(minStartProgression, maxStartProgression);
  const diffProgression = getRandomInt(minDiffProgression, maxDiffProgression);
  const indexMissingNumber = getRandomInt(1, lengthProgression);
  const question = getQuestion(startProgression, diffProgression, indexMissingNumber);
  const correctAnswer = String(startProgression + (indexMissingNumber - 1) * diffProgression);
  return cons(question, correctAnswer);
};

export default () => startGame(description, getDataQuestion);