#include <SFML/Graphics.hpp>
#include <random>
#include <iostream>
#include <math.h>
#include <vector>
#define PI acos(-1)

std::random_device rng;
std::mt19937 twister(rng());

std::uniform_int_distribution<size_t> speed_gen(1, 20);
std::uniform_int_distribution<size_t> angle_gen(0, 359);

float degrees_to_radians(float degrees) {
	return (PI/180)*degrees;
}

sf::Vector2f ds_to_vec(float direction, float speed) {
	float radians = degrees_to_radians(direction);
	float x = speed*sin(radians);
	float angle_2 = degrees_to_radians(180-(direction+90));
	float y = speed*sin(angle_2);

	return sf::Vector2f(x, y);
}

class bullet {
public:
	bullet(sf::Vector2f starting_position, float direction, float speed, sf::CircleShape circle) : circle(circle) {
		this->velocity = ds_to_vec(direction, speed);
		this->circle.setPosition(starting_position);
	}
	sf::CircleShape& get_circle() { return this->circle; }

	void update() {
		this->circle.move(velocity.x, velocity.y);
	}
private:
	sf::CircleShape circle;
	sf::Vector2f velocity;
};

int main() {
	sf::RenderWindow window(sf::VideoMode(640, 480), "Shooting Test", sf::Style::Titlebar | sf::Style::Close);
	window.setFramerateLimit(60);

	std::vector<bullet> bullets;

	sf::Clock timer;
	sf::Event event;
	while(window.isOpen()) {
		while(window.pollEvent(event)) {
			if(event.type == sf::Event::Closed) {
				window.close(); // close the window when the user tries to close the window
			}
		}

		if(timer.getElapsedTime().asSeconds() >= 1) {
			bullet new_bullet = bullet(sf::Vector2f(290, 210), angle_gen(twister), speed_gen(twister), sf::CircleShape(30.F, 30U));
			new_bullet.get_circle().setFillColor(sf::Color(255, 255, 0, 255));
			bullets.push_back(new_bullet);
			timer.restart();
		}

		for(bullet b : bullets) {
			b.update();
			sf::Vector2f pos = b.get_circle().getPosition();
			std::cout << pos.x << " " << pos.y << std::endl;
		}
		window.clear();
		for(bullet b : bullets) { window.draw(b.get_circle()); }
		window.display();
	}
}