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<!DOCTYPE html>
<html>
<head>
    <title>Catch the Ball Game</title>
    <style>
        canvas {
            background: #eee;
            display: block;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <canvas id="gameCanvas" width="480" height="320"></canvas>
    <script src="game.js"></script>
</body>
</html>
const canvas = document.getElementById("gameCanvas");
const ctx = canvas.getContext("2d");

let paddleHeight = 10;
let paddleWidth = 75;
let paddleX = (canvas.width - paddleWidth) / 2;

let rightPressed = false;
let leftPressed = false;

let ballRadius = 10;
let x = canvas.width / 2;
let y = canvas.height - 30;
let dx = 2;
let dy = -2;

document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);

function keyDownHandler(e) {
    if (e.key == "Right" || e.key == "ArrowRight") {
        rightPressed = true;
    } else if (e.key == "Left" || e.key == "ArrowLeft") {
        leftPressed = true;
    }
}

function keyUpHandler(e) {
    if (e.key == "Right" || e.key == "ArrowRight") {
        rightPressed = false;
    } else if (e.key == "Left" || e.key == "ArrowLeft") {
        leftPressed = false;
    }
}

function drawBall() {
    ctx.beginPath();
    ctx.arc(x, y, ballRadius, 0, Math.PI * 2);
    ctx.fillStyle = "#0095DD";
    ctx.fill();
    ctx.closePath();
}

function drawPaddle() {
    ctx.beginPath();
    ctx.rect(paddleX, canvas.height - paddleHeight, paddleWidth, paddleHeight);
    ctx.fillStyle = "#0095DD";
    ctx.fill();
    ctx.closePath();
}

function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    drawBall();
    drawPaddle();

    if (x + dx > canvas.width - ballRadius || x + dx < ballRadius) {
        dx = -dx;
    }
    if (y + dy < ballRadius) {
        dy = -dy;
    } else if (y + dy > canvas.height - ballRadius) {
        if (x > paddleX && x < paddleX + paddleWidth) {
            dy = -dy;
        } else {
            document.location.reload();
        }
    }

    if (rightPressed && paddleX < canvas.width - paddleWidth) {
        paddleX += 7;
    } else if (leftPressed && paddleX > 0) {
        paddleX -= 7;
    }

    x += dx;
    y += dy;
    requestAnimationFrame(draw);
}

draw();