/* ==== Retro Ping Pong Styles ==== */
body.rpp-active-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  font-family: "Press Start 2P", cursive, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; /* Retro font + fallbacks */
  background-color: #1a1a1a; /* Dark background */
  color: #ffffff;
  margin: 0;
  text-align: center;
  padding: 10px;
  box-sizing: border-box;
  image-rendering: pixelated; /* For a sharper retro look if using images/canvas */
}

/* Import Retro Font */
@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&display=swap');

.rpp-game-container {
  background-color: #0d0d0d;
  padding: 20px;
  border-radius: 10px;
  border: 3px solid #333;
  box-shadow: 0 0 15px rgba(0, 255, 0, 0.3), inset 0 0 10px rgba(0,0,0,0.5);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.rpp-title {
  font-size: 2rem;
  color: #00ff00; /* Classic green */
  margin-top: 0;
  margin-bottom: 15px;
  text-shadow: 2px 2px #008000;
}

.rpp-scoreboard {
  display: flex;
  justify-content: space-around;
  width: 100%;
  max-width: 600px;
  margin-bottom: 15px;
}

.rpp-score {
  flex: 1;
}

.rpp-score-label {
  display: block;
  font-size: 0.8rem;
  color: #cccccc;
  margin-bottom: 5px;
}

.rpp-score-value {
  font-size: 2rem;
  color: #ffffff;
  font-weight: bold;
}

#rppGameCanvas {
  background-color: #000000;
  border: 2px solid #00ff00;
  /* Dimensions will be set by JavaScript */
}

.rpp-button {
  background-color: #009900;
  color: #ffffff;
  border: 2px solid #00ff00;
  padding: 10px 20px;
  font-family: "Press Start 2P", cursive;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 20px;
  text-transform: uppercase;
  transition: background-color 0.2s, box-shadow 0.2s;
  box-shadow: 0 0 5px rgba(0, 255, 0, 0.5);
}

.rpp-button:hover {
  background-color: #00cc00;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.7);
}

.rpp-button:active {
  background-color: #006600;
  transform: translateY(1px);
}

.rpp-instructions {
  font-size: 0.8rem;
  color: #bbbbbb;
  margin-top: 15px;
}

.rpp-win-message {
  font-size: 1.5rem;
  color: #ffff00; /* Yellow for win message */
  margin-top: 15px;
  font-weight: bold;
  text-shadow: 2px 2px #cc0000;
}

document.addEventListener('DOMContentLoaded', function() {
    const canvas = document.getElementById('rppGameCanvas');
    const ctx = canvas.getContext('2d');
    const startButton = document.getElementById('rppStartButton');
    const player1ScoreEl = document.getElementById('rppPlayer1Score');
    const player2ScoreEl = document.getElementById('rppPlayer2Score');
    const winMessageEl = document.getElementById('rppWinMessage');
    const instructionsEl = document.getElementById('rppInstructions');

    // Add class to body for specific page styling
    if (document.querySelector('.rpp-game-container')) {
        document.body.classList.add('rpp-active-page');
    }

    // Game settings
    const PADDLE_HEIGHT = 100;
    const PADDLE_WIDTH = 10;
    const BALL_RADIUS = 7;
    const WINNING_SCORE = 5;
    let gameRunning = false;
    let animationFrameId;

    canvas.width = 600;
    canvas.height = 400;

    // Game objects
    let player1 = { x: 10, y: canvas.height / 2 - PADDLE_HEIGHT / 2, width: PADDLE_WIDTH, height: PADDLE_HEIGHT, score: 0, speed: 8 };
    let player2 = { x: canvas.width - PADDLE_WIDTH - 10, y: canvas.height / 2 - PADDLE_HEIGHT / 2, width: PADDLE_WIDTH, height: PADDLE_HEIGHT, score: 0, speed: 4 }; // AI speed
    let ball = { x: canvas.width / 2, y: canvas.height / 2, radius: BALL_RADIUS, speedX: 5, speedY: 5 };

    // Player controls
    let keysPressed = {};
    document.addEventListener('keydown', (e) => { keysPressed[e.key.toLowerCase()] = true; });
    document.addEventListener('keyup', (e) => { keysPressed[e.key.toLowerCase()] = false; });

    function drawRect(x, y, w, h, color) {
        ctx.fillStyle = color;
        ctx.fillRect(x, y, w, h);
    }

    function drawCircle(x, y, r, color) {
        ctx.fillStyle = color;
        ctx.beginPath();
        ctx.arc(x, y, r, 0, Math.PI * 2, false);
        ctx.closePath();
        ctx.fill();
    }

    function drawNet() {
        for (let i = 0; i < canvas.height; i += 15) {
            drawRect(canvas.width / 2 - 1, i, 2, 10, '#555');
        }
    }

    function resetBall() {
        ball.x = canvas.width / 2;
        ball.y = canvas.height / 2;
        ball.speedX = (Math.random() > 0.5 ? 1 : -1) * 5; // Random horizontal direction
        ball.speedY = (Math.random() * 6) - 3;      // Random vertical direction, less steep
        if (Math.abs(ball.speedY) < 2) ball.speedY = ball.speedY < 0 ? -2 : 2; // Ensure not too flat
    }

    function updateScores() {
        player1ScoreEl.textContent = player1.score;
        player2ScoreEl.textContent = player2.score;
    }

    function checkWin() {
        if (player1.score >= WINNING_SCORE || player2.score >= WINNING_SCORE) {
            gameRunning = false;
            winMessageEl.textContent = (player1.score >= WINNING_SCORE ? 'Player 1 Wins!' : 'Player 2 Wins!');
            winMessageEl.style.display = 'block';
            startButton.textContent = 'Restart Game';
            startButton.style.display = 'block';
            if (animationFrameId) cancelAnimationFrame(animationFrameId);
        }
    }

    function update() {
        if (!gameRunning) return;

        // Move player 1 paddle
        if (keysPressed['w'] && player1.y > 0) {
            player1.y -= player1.speed;
        }
        if (keysPressed['s'] && player1.y < canvas.height - player1.height) {
            player1.y += player1.speed;
        }

        // AI for player 2 paddle (simple)
        let player2Center = player2.y + player2.height / 2;
        if (player2Center < ball.y - 20 && player2.y < canvas.height - player2.height) {
            player2.y += player2.speed;
        } else if (player2Center > ball.y + 20 && player2.y > 0) {
            player2.y -= player2.speed;
        }
        // Keep AI paddle within bounds
        if (player2.y < 0) player2.y = 0;
        if (player2.y > canvas.height - player2.height) player2.y = canvas.height - player2.height;

        // Move ball
        ball.x += ball.speedX;
        ball.y += ball.speedY;

        // Ball collision with top/bottom walls
        if (ball.y - ball.radius < 0 || ball.y + ball.radius > canvas.height) {
            ball.speedY = -ball.speedY;
        }

        // Ball collision with paddles
        // Player 1 (left)
        if (ball.x - ball.radius < player1.x + player1.width &&
            ball.x + ball.radius > player1.x &&
            ball.y + ball.radius > player1.y &&
            ball.y - ball.radius < player1.y + player1.height) {
            ball.speedX = -ball.speedX;
            // Optional: Change angle based on where it hits paddle
            let deltaY = ball.y - (player1.y + player1.height / 2);
            ball.speedY = deltaY * 0.15; // Max speedY change
            // Increase ball speed slightly on hit
            ball.speedX *= 1.05;
        }

        // Player 2 (right)
        if (ball.x + ball.radius > player2.x &&
            ball.x - ball.radius < player2.x + player2.width &&
            ball.y + ball.radius > player2.y &&
            ball.y - ball.radius < player2.y + player2.height) {
            ball.speedX = -ball.speedX;
            let deltaY = ball.y - (player2.y + player2.height / 2);
            ball.speedY = deltaY * 0.15;
            ball.speedX *= 1.05;
        }

        // Score points
        if (ball.x - ball.radius < 0) { // Player 2 scores
            player2.score++;
            updateScores();
            resetBall();
            checkWin();
        } else if (ball.x + ball.radius > canvas.width) { // Player 1 scores
            player1.score++;
            updateScores();
            resetBall();
            checkWin();
        }
    }

    function render() {
        // Clear canvas
        drawRect(0, 0, canvas.width, canvas.height, '#000000');
        drawNet();
        // Draw paddles
        drawRect(player1.x, player1.y, player1.width, player1.height, '#00ff00');
        drawRect(player2.x, player2.y, player2.width, player2.height, '#00ff00');
        // Draw ball
        drawCircle(ball.x, ball.y, ball.radius, '#ffffff');
    }

    function gameLoop() {
        if (gameRunning) {
            update();
            render();
            animationFrameId = requestAnimationFrame(gameLoop);
        }
    }

    function startGame() {
        player1.score = 0;
        player2.score = 0;
        player1.y = canvas.height / 2 - PADDLE_HEIGHT / 2;
        player2.y = canvas.height / 2 - PADDLE_HEIGHT / 2;
        updateScores();
        resetBall();
        gameRunning = true;
        winMessageEl.style.display = 'none';
        startButton.style.display = 'none';
        instructionsEl.style.display = 'block';
        if (animationFrameId) cancelAnimationFrame(animationFrameId);
        gameLoop();
    }

    startButton.addEventListener('click', startGame);
    
    // Initial render (e.g. to show paddles before game starts)
    render(); 
    updateScores();
});