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const canvas = document.getElementById("gameCanvas");
const ctx = canvas.getContext("2d");
const blockSize = 20;
let snake = [{ x: 10, y: 10 }];
let food = { x: 15, y: 10 };
let dx = 1;
let dy = 0;
let score = 0;
let isGameOver = false;

function drawBlock(x, y) {
  ctx.fillStyle = "green";
  ctx.fillRect(x * blockSize, y * blockSize, blockSize, blockSize);
  ctx.strokeStyle = "black";
  ctx.strokeRect(x * blockSize, y * blockSize, blockSize, blockSize);
}

function drawSnake() {
  snake.forEach(segment => drawBlock(segment.x, segment.y));
}

function drawFood() {
  drawBlock(food.x, food.y);
}

function gameOver() {
  isGameOver = true;
  clearInterval(gameLoop);
  document.getElementById("gameOverText").innerText = "Game Over! Your score: " + score;
  document.getElementById("score").innerText = "0";
}

function clearCanvas() {
  ctx.clearRect(0, 0, canvas.width, canvas.height);
}

function updateGame() {
  if (isGameOver) return;
  clearCanvas();
  drawSnake();
  drawFood();
  moveSnake();
  checkCollision();
}

function startGame() {
  snake = [{ x: 10, y: 10 }];
  dx = 1;
  dy = 0;
  score = 0;
  isGameOver = false;
  document.getElementById("gameOverText").innerText = "";
  document.getElementById("score").innerText = score;
  generateFood();
  gameLoop = setInterval(updateGame, 100);
}

document.addEventListener("keydown", keyDownHandler);

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