#include <SFML/Graphics.hpp>

constexpr int WINDOW_WIDTH = 800;
constexpr int WINDOW_HEIGHT = 600;

// The Ball class represents the ball that moves across the screen.
class Ball {
public:
    // The ball's position and radius are set in the constructor.
    Ball(float x, float y, float radius)
        : m_position(x, y)
        , m_radius(radius)
    {
        // Initialize the ball's velocity to a random value.
        m_velocity.x = -200.0f + rand() % 400;
        m_velocity.y = -200.0f + rand() % 400;
    }

    // The ball's position and velocity are updated in each frame.
    void update(float dt)
    {
        // Update the ball's position based on its velocity and the time passed.
        m_position += m_velocity * dt;

        // Check for collision with the walls.
        if (m_position.x - m_radius < 0.0f) {
            m_velocity.x = -m_velocity.x;
            m_position.x = m_radius;
        } else if (m_position.x + m_radius > WINDOW_WIDTH) {
            m_velocity.x = -m_velocity.x;
            m_position.x = WINDOW_WIDTH - m_radius;
        }

        if (m_position.y - m_radius < 0.0f) {
            m_velocity.y = -m_velocity.y;
            m_position.y = m_radius;
        } else if (m_position.y + m_radius > WINDOW_HEIGHT) {
            m_velocity.y = -m_velocity.y;
            m_position.y = WINDOW_HEIGHT - m_radius;
        }
    }

    // The ball is drawn to the screen using its position and radius.
    void draw(sf::RenderWindow& window)
    {
        sf::CircleShape shape(m_radius);
        shape.setPosition(m_position);
        shape.setFillColor(sf::Color::White);
        window.draw(shape);
    }

private:
    // The ball's position, velocity, and radius are stored as member variables.
    sf::Vector2f m_position;
    sf::Vector2f m_velocity;
    float m_radius;
};

// The Paddle class represents the players' paddles.
class Paddle {
public:
    // The paddle's position, size, and speed are set in the constructor.
    Paddle(float x, float y, float width, float height, float speed)
        : m_position(x, y)
        , m_size(width, height)
        , m_speed(speed)
    {
    }

    // The paddle's position is updated based on user input.
    void update