snake/app.ts at master · wopperer/snake · GitHub

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const playGround = document.querySelector('#playGround');
const easyButton = document.querySelector('#easyButton') as Element;
const overLay = document.querySelector('#overLay') as HTMLDivElement;
const middleButton = document.querySelector('#middleButton') as Element;
const advancedButton = document.querySelector('#advancedButton') as Element;

let snake = [28, 47, 66];
let direction: 'down' | 'up' | 'left' | 'right' = 'down';
let stone: number;
let started = false;
let interval: number;
let speed = 200;

document.addEventListener('keydown', (e) => {
  if (e.keyCode === 40) {
    direction = 'down';
  } else if (e.keyCode === 38) {
    direction = 'up';
  } else if (e.keyCode === 37) {
    direction = 'left';
  } else if (e.keyCode === 39) {
    direction = 'right';
  }
});

easyButton.addEventListener('click', () => {
  init('easy');
});

middleButton.addEventListener('click', () => {
  init('middle');
});

advancedButton.addEventListener('click', () => {
  init('advanced');
});

overLay.style.visibility = 'visible';
overLay.style.borderColor = 'rgb(17,17,215)';
overLay.querySelector('.overlayHeader')!.textContent = 'select level';

function init (level) {
  snake = [28, 47, 66];
  direction = 'down';
  started = false;
  clearInterval(interval);
  playGround!.innerHTML = '';
  speed = level === 'easy' ? 200 : level === 'middle' ? 100 : 50;

  const overLay = document.querySelector('#overLay') as HTMLDivElement;
  overLay.style.visibility = 'hidden';

  const score = document.querySelector('#score');
  score!.textContent = '0';

  for (let i = 0; i < 266; i++) {
    const square = document.createElement('div');
    square.className = `square s${i} ${snake.includes(i) ? 'snake' : ''}`;
    playGround!.appendChild(square);
  }
  throwStone();
}

function throwStone () {
  stone = getRandomInt(0, 265, snake);
  const stoneSquare = document.querySelector(`.s${stone}`) as HTMLDivElement;
  stoneSquare.classList.add('stone');
  if (!started) {
    interval = setInterval(() => { move(); }, speed);
  }
  started = true;
}

function getRandomInt (min, max, snake) {
  min = Math.ceil(min);
  max = Math.floor(max);
  let result = Math.floor(Math.random() * (max - min)) + min;
  while (snake.includes(result)) {
    result = Math.floor(Math.random() * (max - min)) + min;
  }
  return result;
}

function move () {
  const oldSnake = snake;
  snake.shift();
  switch (direction) {
    case 'down':
      snake.push(oldSnake[oldSnake.length - 1] + 19);
      break;
    case 'up':
      snake.push(oldSnake[oldSnake.length - 1] - 19);
      break;
    case 'left':
      snake.push(oldSnake[oldSnake.length - 1] - 1);
      break;
    case 'right':
      snake.push(oldSnake[oldSnake.length - 1] + 1);
      break;
  }

  const snakeSquares = document.querySelectorAll('.snake');

  const newSnakeSquare = document.querySelector(`.s${snake[snake.length - 1]}`);

  // snake hit snake - game over
  if (newSnakeSquare?.classList.contains('snake')) {
    clearInterval(interval);
    const overLay = document.querySelector('#overLay') as HTMLDivElement;
    overLay.style.visibility = 'visible';
    overLay.querySelector('.overlayHeader')!.textContent = 'game over!';
    overLay.style.borderColor = 'rgb(255, 0, 0)';
    return;
  }

  newSnakeSquare?.classList.add('snake');

  snakeSquares.forEach(snakeSquare => {
    if (!snake.includes(parseInt(snakeSquare.classList[1].split('s')[1]))) {
      snakeSquare.classList.remove('snake');
    }
  });

  // snake eats stone - points
  if (snake[snake.length - 1] === stone) {
    const stoneSquare = <HTMLDivElement>document.querySelector(`.s${stone}`);
    stoneSquare.classList.remove('stone');
    snake.unshift(oldSnake[0]);
    const score = <HTMLDivElement>document.querySelector('#score');
    score.textContent = `${parseInt(score.textContent ? score.textContent : '0') + 25}`;
    const recordElement = <HTMLDivElement>document.querySelector('#record');
    if (parseInt(score.textContent) > parseInt(recordElement?.textContent ? recordElement.textContent : '0')) {
      recordElement.textContent = score.textContent;
    }
    throwStone();
  }

  // snake hit top or bottom - game over
  if (!newSnakeSquare?.classList.length) {
    clearInterval(interval);
    const overLay = document.querySelector('#overLay') as HTMLDivElement;
    overLay.style.visibility = 'visible';
    overLay.querySelector('.overlayHeader')!.textContent = 'game over!';
    overLay.style.borderColor = 'rgb(255, 0, 0)';
  }

  // snake hit left or right - game over
  if (((snake[snake.length - 1] % 19 === 18) && direction === 'left') || ((snake[snake.length - 1] % 19 === 0) && direction === 'right')) {
    clearInterval(interval);
    const overLay = document.querySelector('#overLay') as HTMLDivElement;
    overLay.style.visibility = 'visible';
    overLay.querySelector('.overlayHeader')!.textContent = 'game over!';
    overLay.style.borderColor = 'rgb(255, 0, 0)';
  }
}