#include <SFML/Graphics.hpp>
#include <list>

float rand(float a, float b)
{
	return ((float)rand() / (float)RAND_MAX) * (b - a) + a;
}

int main()
{
	sf::VideoMode full = sf::VideoMode::getDesktopMode();

	sf::RenderWindow window(sf::VideoMode(full.height/2, full.height/2), "yes", sf::Style::Titlebar | sf::Style::Close);

	window.setFramerateLimit(120);

	const float RADIUS = full.height / 20.0f;

	sf::CircleShape circle(RADIUS);
	circle.setOutlineThickness(1);
	circle.setOutlineColor(sf::Color::Magenta);
	circle.setFillColor(sf::Color::Green);

	sf::Vector2f speed(rand(3, 6), rand(3, 6));

	const sf::Vector2u wndSize = window.getSize();

	sf::Vector2f currPos;
	std::list<sf::Vector2f> storage;

	while (window.isOpen())
	{
		window.clear();

		sf::Event event;
		while (window.pollEvent(event))
		{
			if (event.type == sf::Event::Closed)
				window.close();
		}

		currPos = circle.getPosition();
		storage.push_back(currPos);

		printf("x: %f y: %f\txSpeed: %f ySpeed: %f\n\n", currPos.x, currPos.y, speed.x, speed.y);

		if (currPos.x < 0 || currPos.x + RADIUS * 2 >= wndSize.x)
			speed.x = -speed.x;

		if (currPos.y < 0 || currPos.y + RADIUS * 2 >= wndSize.y)
			speed.y = -speed.y;

		circle.setPosition(currPos.x + speed.x, currPos.y + speed.y);

		if (storage.size() > 100)
			storage.pop_front();

		for (sf::Vector2f meme : storage)
		{
			sf::CircleShape a(RADIUS);
			a.setOutlineThickness(1);
			a.setOutlineColor(sf::Color::Magenta);
			a.setFillColor(sf::Color::Green);

			a.setPosition(meme);

			window.draw(a);
		}


		window.draw(circle);
		window.display();
	}

	return 69;
}