class SnakeGame extends HTMLElement {
  connectedCallback() {
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.innerHTML = `
      <style>
        .game-container {
          width: 400px;
          height: 400px;
          margin: 0 auto;
          background-color: rgba(15, 23, 42, 0.8);
          border: 2px solid rgba(99, 102, 241, 0.5);
          border-radius: 0.75rem;
          box-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
          position: relative;
          overflow: hidden;
        }
        .game-container::before {
          content: "";
          position: absolute;
          inset: 0;
          background-image: 
              linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
              linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
          background-size: 20px 20px;
        }
position: relative;
          overflow: hidden;
        }
        .snake-body {
          position: absolute;
          width: 20px;
          height: 20px;
          background: linear-gradient(135deg, #6366f1, #8b5cf6);
          border-radius: 4px;
          box-shadow: 0 0 5px rgba(139, 92, 246, 0.7);
          z-index: 2;
        }
        .food {
          position: absolute;
          width: 16px;
          height: 16px;
          background: linear-gradient(135deg, #f43f5e, #f97316);
          border-radius: 50%;
          box-shadow: 0 0 10px rgba(244, 63, 94, 0.7);
          z-index: 2;
          animation: pulse 1s infinite alternate;
        }
        @keyframes pulse {
          from { transform: scale(1); }
          to { transform: scale(1.2); }
        }
.controls {
          display: flex;
          justify-content: center;
          gap: 1rem;
          margin-top: 1rem;
        }
        button {
          padding: 0.5rem 1.5rem;
          background: linear-gradient(90deg, #6366f1, #8b5cf6);
          color: white;
          border: none;
          border-radius: 0.5rem;
          cursor: pointer;
          font-weight: 600;
          transition: all 0.3s;
          box-shadow: 0 4px 6px rgba(99, 102, 241, 0.2);
        }
        button:hover {
          transform: translateY(-2px);
          box-shadow: 0 6px 12px rgba(99, 102, 241, 0.3);
        }
        .score {
          text-align: center;
          margin-top: 1rem;
          font-size: 1.2rem;
          background: linear-gradient(90deg, #6366f1, #8b5cf6);
          -webkit-background-clip: text;
          background-clip: text;
          color: transparent;
          font-weight: bold;
          letter-spacing: 0.05em;
        }
</style>
      <div class="game-container" id="game-board"></div>
      <div class="score">Score: <span id="score">0</span></div>
      <div class="controls">
        <button id="start-btn">Start Game</button>
        <button id="reset-btn">Reset</button>
      </div>
    `;

    this.initGame();
  }

  initGame() {
    const shadow = this.shadowRoot;
    const gameBoard = shadow.getElementById('game-board');
    const scoreDisplay = shadow.getElementById('score');
    const startBtn = shadow.getElementById('start-btn');
    const resetBtn = shadow.getElementById('reset-btn');

    // Game state
    let snake = [{x: 200, y: 200}];
    let food = this.generateFood();
    let direction = 'right';
    let gameInterval;
    let score = 0;
    let gameSpeed = 150;
    let gameStarted = false;

    // Draw initial state
    this.drawGame();

    // Event listeners
    startBtn.addEventListener('click', startGame);
    resetBtn.addEventListener('click', resetGame);
    document.addEventListener('keydown', changeDirection);

    function startGame() {
      if (gameStarted) return;
      gameStarted = true;
      gameInterval = setInterval(moveSnake, gameSpeed);
    }

    function resetGame() {
      clearInterval(gameInterval);
      snake = [{x: 200, y: 200}];
      direction = 'right';
      score = 0;
      scoreDisplay.textContent = '0';
      gameStarted = false;
      this.drawGame();
    }

    function changeDirection(e) {
      if (!gameStarted) return;
      const key = e.keyCode;
      if (key === 37 && direction !== 'right') direction = 'left';
      else if (key === 38 && direction !== 'down') direction = 'up';
      else if (key === 39 && direction !== 'left') direction = 'right';
      else if (key === 40 && direction !== 'up') direction = 'down';
    }

    function moveSnake() {
      const head = {...snake[0]};
      
      switch(direction) {
        case 'up': head.y -= 20; break;
        case 'down': head.y += 20; break;
        case 'left': head.x -= 20; break;
        case 'right': head.x += 20; break;
      }

      // Check for collision with walls or self
      if (head.x < 0 || head.x >= 400 || head.y < 0 || head.y >= 400 || 
          snake.some(segment => segment.x === head.x && segment.y === head.y)) {
        clearInterval(gameInterval);
        alert('Game Over! Your score: ' + score);
        return;
      }

      snake.unshift(head);

      // Check if snake ate food
      if (head.x === food.x && head.y === food.y) {
        score += 10;
        scoreDisplay.textContent = score;
        food = this.generateFood();
        // Speed up game
        if (score % 50 === 0 && gameSpeed > 50) {
          gameSpeed -= 10;
          clearInterval(gameInterval);
          gameInterval = setInterval(moveSnake, gameSpeed);
        }
      } else {
        snake.pop();
      }

      this.drawGame();
    }

    this.generateFood = function() {
      const x = Math.floor(Math.random() * 20) * 20;
      const y = Math.floor(Math.random() * 20) * 20;
      
      // Make sure food doesn't spawn on snake
      if (snake.some(segment => segment.x === x && segment.y === y)) {
        return this.generateFood();
      }
      
      return {x, y};
    }

    this.drawGame = function() {
      gameBoard.innerHTML = '';
      
      // Draw snake
      snake.forEach(segment => {
        const snakeElement = document.createElement('div');
        snakeElement.className = 'snake-body';
        snakeElement.style.left = segment.x + 'px';
        snakeElement.style.top = segment.y + 'px';
        gameBoard.appendChild(snakeElement);
      });
      
      // Draw food
      const foodElement = document.createElement('div');
      foodElement.className = 'food';
      foodElement.style.left = food.x + 'px';
      foodElement.style.top = food.y + 'px';
      gameBoard.appendChild(foodElement);
    }
  }
}

customElements.define('snake-game', SnakeGame);