namespace game {

class Button
{
public:
    Button(int _x, int _y, int _width, int _height, std::string text)
    {
        texture.loadFromFile("res/button.png");

        state = NORMAL;

        this->x = _x;
        this->y = _y;
        this->width = _width;
        this->height = _height;

        sf::Font font;
        font.loadFromFile("res/SF Intermosaic B.ttf");
        label.setFont(font);
        label.setString(text);
        label.setCharacterSize(16);
        label.setColor(sf::Color(20, 20, 20));

        recalculateVertices();
    }

    void update(const sf::Vector2i mousePos)
    {
        if(mousePos.x > this->x && mousePos.y > this->y && mousePos.x < this->x + this->width && mousePos.y < this->y + this->height)
        {
            if(sf::Mouse::isButtonPressed(sf::Mouse::Left)) {
                state = ACTIVE;
            }
            else
            {
                state = HOVER;
            }
        }
        else
        {
            state = NORMAL;
        }
    }

    void draw(sf::RenderWindow& window) const
    {
        sf::RenderStates states;
        states.texture = &texture;

        window.draw(vertices[state], states);
        // window.draw(label);
    }

private:
    sf::VertexArray vertices[3];
    sf::Texture texture;

    int x, y, width, height;
    sf::Text label;

    enum { NORMAL, HOVER, ACTIVE } state;

    void recalculateVertices()
    {
        int left   = 6;
        int top    = 6;
        int right  = 34;
        int bottom = 14;

        int texwidth  = 40;
        int texheight = 20;

        int xPos[4] = { x, x + left, x + width - (texwidth - right),    x + width  };
        int yPos[4] = { y, y + left, y + height - (texheight - bottom), y + height };
        int xTCoords[4] = { 0, left, right, texwidth  };
        int yTCoords[4] = { 0, top, bottom, texheight };

        label.setPosition(x + 10, y + 10);


        for(int l = 0; l < 3; l++) {
            vertices[l] = sf::VertexArray(sf::Quads, 36);

            int i = 0;
            for(int j = 0; j < 3; j++) {
                for(int k = 0; k < 3; k++) {
                    vertices[l][i+0].position = sf::Vector2f(xPos[j+0], yPos[k+0]);
                    vertices[l][i+1].position = sf::Vector2f(xPos[j+1], yPos[k+0]);
                    vertices[l][i+2].position = sf::Vector2f(xPos[j+1], yPos[k+1]);
                    vertices[l][i+3].position = sf::Vector2f(xPos[j+0], yPos[k+1]);

                    vertices[l][i+0].texCoords = sf::Vector2f(xTCoords[j+0], yTCoords[k+0] + texheight * l);
                    vertices[l][i+1].texCoords = sf::Vector2f(xTCoords[j+1], yTCoords[k+0] + texheight * l);
                    vertices[l][i+2].texCoords = sf::Vector2f(xTCoords[j+1], yTCoords[k+1] + texheight * l);
                    vertices[l][i+3].texCoords = sf::Vector2f(xTCoords[j+0], yTCoords[k+1] + texheight * l);

                    i += 4;
                }
            }
        }
    }
};

}