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

sf::RenderWindow window;
constexpr int WIDTH  = 1280,
              HEIGHT = 720;

void checkForClose();

class Draggable_Sprite
{
    public:
        void setSprite ( sf::RectangleShape& sprite )
        {
            m_sprite = &sprite;
            offset = getOffsetToMouse();
        }

        void update()
        {
            if ( !m_sprite ) return;

            if ( !sf::Mouse::isButtonPressed( sf::Mouse::Left ) )
            {
                m_sprite = nullptr;
                return;
            }

            if ( m_sprite )
            {

                float yPos = sf::Mouse::getPosition( window ).y - offset.y;
                float xPos = sf::Mouse::getPosition( window ).x - offset.x;

                m_sprite->setPosition( { xPos, yPos } );

            }

        }

        bool hasSprite()
        {
            return m_sprite;
        }

    private:
        sf::Vector2i getOffsetToMouse (  )
        {
            float mouseX = sf::Mouse::getPosition( window ).x;
            float mouseY = sf::Mouse::getPosition( window ).y;

            float spriteX = m_sprite->getPosition().x;
            float spriteY = m_sprite->getPosition().y;

            return {    (int)mouseX - spriteX,
                        (int)mouseY - spriteY };
        }


        sf::RectangleShape* m_sprite    = nullptr;
        sf::Vector2i offset             = { 0, 0 };
};

bool touchingMouse ( const sf::RectangleShape& shape )
{
    float height = shape.getLocalBounds().height;
    float width  = shape.getLocalBounds().width;

    float mouseX = sf::Mouse::getPosition( window ).x;
    float mouseY = sf::Mouse::getPosition( window ).y;

    float spriteX = shape.getPosition().x;
    float spriteY = shape.getPosition().y;

    return  (   mouseX > spriteX &&
                mouseX < spriteX + width &&
                mouseY > spriteY &&
                mouseY < spriteY + height );
}

int main()
{
    window.create( sf::VideoMode ( WIDTH, HEIGHT ), "Drag the square!", sf::Style::Close );

    window.setFramerateLimit( 60 );

    sf::RectangleShape shape;
    shape.setSize( { 50, 50 } );
    shape.setPosition( { 242, 124 } );

    Draggable_Sprite sprite;

    std::cout << sizeof ( window ) << std::endl;


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

        if ( touchingMouse( shape ) && sf::Mouse::isButtonPressed( sf::Mouse::Left ) && !sprite.hasSprite() )
        {
            sprite.setSprite( shape );
            continue;
        }

        sprite.update();



        window.draw( shape );

        window.display();

        checkForClose();
    }
}

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