#include <SFML/Graphics.hpp>
#include <vector>
#include <iostream>
#include <ctime>


using namespace sf;
using std::vector;

class Player
{
private: float x, y;
public: float speed = 0;
        int dir;
        Player()
        {
            Snk.push_back(Snake(11, 4));
            Snk.push_back(Snake(1, 4));
        }
        struct Snake
        {
            RectangleShape SnakeBody;
            int x;
            int y;

            Snake(float x_, float y_) :
                x(x_),
                y(y_)
            {
                SnakeBody.setSize(Vector2f(10, 10));
                SnakeBody.setFillColor(Color::Red);
            }
        };
        vector <Snake> Snk;

        void Update(float time)
        {

            move();
            speed = 800.f;
            switch (dir)
            {
            case 1: x += speed * time;
                break;
            case 2: x -= speed * time;
                break;
            case 3: y += speed * time;
                break;
            case 4: y -= speed * time;
            }

        }

        void move()
        {
            if (Keyboard::isKeyPressed(Keyboard::Right)) {
                dir = 1;
            }
            if (Keyboard::isKeyPressed(Keyboard::Left)) {
                dir = 2;
            }
            if (Keyboard::isKeyPressed(Keyboard::Down)) {
                dir = 3;
            }
            if (Keyboard::isKeyPressed(Keyboard::Up)) {
                dir = 4;
            }
        }
        void Snake_move(RenderWindow & window)
        {
            for (int i = Snk.size() - 1; i > 0; i --) {
                Snk[i].x = Snk[i - 1].x;
                Snk[i].y = Snk[i - 1].y;
                for (int j = 0; j < Snk.size(); j++) {
                    Snk[i].x += 5;
                }
            }
            Snk[0].x = (int)x / 10;
            Snk[0].y = (int)y / 10;

            for (int i = 0; i < Snk.size(); i++) {
                Snk[i].SnakeBody.setPosition(Snk[i].x, Snk[i].y);
                window.draw(Snk[i].SnakeBody);
            }
        }
};


int main()
{
    const int WINDOW_WIDTH = 400;
    const int WINDOW_HEIGHT = 400;
    RenderWindow window(VideoMode(WINDOW_WIDTH, WINDOW_HEIGHT), L"Змейка");

    srand(time(NULL));
    Clock clock;

    Event event;
    Player player;

    while (window.isOpen()) {

        float time = clock.getElapsedTime().asMilliseconds() / 1000.f;
        clock.restart();

        player.Update(time);

        while (window.pollEvent(event)) {
            if (event.type == Event::Closed) {
                window.close();
            }
        }
        window.clear(Color::Green);
        player.Snake_move(window);
        window.display();
    }

    return 0;
}