<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Snake Game - GameBoy Style</title>
    <style>
      /* Base Reset */
      body,
      html {
        margin: 0;
        padding: 0;
        font-family: monospace;
        background-color: #3a2d56;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
      }

      /* GameBoy Layout */
      .gameboy {
        background-color: #5f4c82;
        width: 441px;
        height: 735px;
        border-radius: 20px;
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.6);
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 10px;
        position: relative;
      }

      @media (max-width: 768px) {
        .gameboy {
          width: 100vw;
          height: 100vh;
          border-radius: 0;
        }
      }

      /* Screen */
      .screen {
        background-color: black;
        border: 4px solid #0f380f;
        width: 90%;
        height: 55%;
        margin-top: 20px;
        border-radius: 10px;
        display: flex;
        justify-content: center;
        align-items: center;
        box-shadow: inset 0 4px 8px rgba(0, 0, 0, 0.5);
        overflow: hidden;
      }

      canvas {
        border: 1px solid black;
      }

      /* Restart Button */
      #restartBtn {
        padding: 10px 20px;
        font-size: 16px;
        cursor: pointer;
        margin-top: 20px;
        background-color: #0f380f;
        color: white;
        border: none;
        border-radius: 5px;
        display: none;
      }

      #restartBtn:hover {
        background-color: #9bbc0f;
      }

      /* Titles */
      h1 {
        font-size: 1.8rem;
        margin-bottom: 10px;
        text-transform: uppercase;
        color: #9bbc0f;
      }
    </style>
  </head>
  <body>
    <div class="gameboy">
      <h1>Snake Game</h1>
      <div class="screen">
        <canvas id="snake" width="400" height="400"></canvas>
      </div>
      <button id="restartBtn">Restart</button>
    </div>

    <script>
      "use strict";

      const cvs = document.getElementById("snake");
      const ctx = cvs.getContext("2d");
      const box = 20;

      let snake = [{ x: 9 * box, y: 10 * box }];
      let food = {
        x: Math.floor(Math.random() * 19 + 1) * box,
        y: Math.floor(Math.random() * 19 + 1) * box,
      };
      let score = 0;
      let d;
      let game;

      document.addEventListener("keydown", direction);
      function direction(event) {
        let key = event.keyCode;
        if ((key == 37 || key == 65) && d != "RIGHT") d = "LEFT";
        else if ((key == 38 || key == 87) && d != "DOWN") d = "UP";
        else if ((key == 39 || key == 68) && d != "LEFT") d = "RIGHT";
        else if ((key == 40 || key == 83) && d != "UP") d = "DOWN";
      }

      function collision(head, array) {
        return array.some((part) => head.x == part.x && head.y == part.y);
      }

      function draw() {
        ctx.fillStyle = "#0f380f";
        ctx.fillRect(0, 0, cvs.width, cvs.height);

        ctx.fillStyle = "red";
        ctx.fillRect(food.x, food.y, box, box);

        for (let i = 0; i < snake.length; i++) {
          ctx.fillStyle = i == 0 ? "lime" : "white";
          ctx.fillRect(snake[i].x, snake[i].y, box, box);
          ctx.strokeStyle = "black";
          ctx.strokeRect(snake[i].x, snake[i].y, box, box);
        }

        let snakeX = snake[0].x;
        let snakeY = snake[0].y;

        if (d == "LEFT") snakeX -= box;
        if (d == "UP") snakeY -= box;
        if (d == "RIGHT") snakeX += box;
        if (d == "DOWN") snakeY += box;

        if (snakeX == food.x && snakeY == food.y) {
          score++;
          food = {
            x: Math.floor(Math.random() * 19 + 1) * box,
            y: Math.floor(Math.random() * 19 + 1) * box,
          };
        } else {
          snake.pop();
        }

        let newHead = { x: snakeX, y: snakeY };

        if (
          snakeX < 0 ||
          snakeX >= cvs.width ||
          snakeY < 0 ||
          snakeY >= cvs.height ||
          collision(newHead, snake)
        ) {
          clearInterval(game);
          document.getElementById("restartBtn").style.display = "block";
          return;
        }

        snake.unshift(newHead);

        ctx.fillStyle = "white";
        ctx.font = "20px Arial";
        ctx.fillText("Score: " + score, 10, 20);
      }

      function restartGame() {
        snake = [{ x: 9 * box, y: 10 * box }];
        food = {
          x: Math.floor(Math.random() * 19 + 1) * box,
          y: Math.floor(Math.random() * 19 + 1) * box,
        };
        score = 0;
        d = "";
        document.getElementById("restartBtn").style.display = "none";
        game = setInterval(draw, 150);
      }

      document
        .getElementById("restartBtn")
        .addEventListener("click", restartGame);
      game = setInterval(draw, 150);
    </script>
  </body>
</html>