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

using namespace std;
using namespace sf;

class AnimatedSprite : public Sprite
{
private:
    Texture texture;
    vector<IntRect>frames_;
    float current_frame_time_ = 0.0;
    int current_frame_index_ = 0;
    float fps_ = 4.0;

    float v_x = 0.0;
    float v_y = 0.0;

    float acc_x = 0.0;
    float acc_y = 50.0;
public:
    AnimatedSprite(Vector2f position)
    {
        texture.loadFromFile("character.png");
        setTexture(texture);
        setPosition(position);
        setScale(4,4);
    }
    void add_animation_frame(IntRect frame)
    {
        if(frames_.empty())
        {
            setTextureRect(frame);
        }
        frames_.push_back(frame);
    }
    void step(float delta_t)
    {
        v_x += delta_t*acc_x;
        v_y += delta_t*acc_y;
        current_frame_time_ +=delta_t;
        cerr<<current_frame_time_<<endl;
        while (current_frame_time_>= (1.0/fps_))
        {
            current_frame_time_ -= (1.0/fps_);
            current_frame_index_ = (current_frame_index_ +1) % frames_.size();
            setTextureRect(frames_[current_frame_index_]);
        }
        if(Keyboard::isKeyPressed(Keyboard::W))
        {
            move(0,-v_y*delta_t);
            // add_animation_frame(IntRect(0, 0, 32, 32));
        }
        if(Keyboard::isKeyPressed(Keyboard::S))
        {
            move(0,v_y*delta_t);
            //   add_animation_frame(IntRect(0, 0, 32, 32));
        }
        if(Keyboard::isKeyPressed(Keyboard::A))
        {
            move(-v_x*delta_t,0);
            //   add_animation_frame(IntRect(0, 0, 32, 32));
        }
        if(Keyboard::isKeyPressed(Keyboard::D))
        {
            move(v_x*delta_t,0);
            //  add_animation_frame(IntRect(0, 0, 32, 32));
        }
    }
};

int main() {
    // create the window
    sf::RenderWindow window(sf::VideoMode(800, 600), "My window");
    AnimatedSprite hero(Vector2f(600,100));

    hero.add_animation_frame({0,0,50,37});
    hero.add_animation_frame({50,0,50,37});
    hero.add_animation_frame({100,0,50,37});
    Clock clock;
    // run the program as long as the window is open
    while (window.isOpen()) {
        float delta_t = float (clock.getElapsedTime().asMicroseconds())/1000000.0;

        clock.restart();
        // check all the window's events that were triggered since the last iteration of the loop
        sf::Event event;
        while (window.pollEvent(event))
        {
            // "close requested" event: we close the window
            if (event.type == sf::Event::Closed)
                window.close();
        }
        hero.step(delta_t);
        // clear the window with black color
        window.clear(sf::Color::Black);
        window.draw(hero);
        // draw everything here...


        // end the current frame
        window.display();
    }

    return 0;
}