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use std::rc::Rc;
use std::cell::RefCell;

pub mod elements;
pub mod state;

pub trait App {
    fn update(&mut self);
    fn render(&self) -> Renderable;
}

pub trait Element {
    fn render(&self) -> Renderable;
}

pub trait RawRender {
    fn draw(&mut self, ctx: &mut miniquad::graphics::Context);
}

pub enum Renderable {
    Element(Rc<RefCell<dyn Element>>),
    RawRender(Rc<RefCell<dyn RawRender>>),
}

struct Stage {
    app: Box<dyn App>,
    what: Rc<RefCell<dyn RawRender>>,
}

impl Stage {
    pub fn new(app: Box<dyn App>) -> Self {
        let what = get_render(app.render());
        Self { what, app }
    }
}

impl miniquad::EventHandler for Stage {
    fn update(&mut self, _ctx: &mut miniquad::graphics::Context) {
        self.app.update();
    }

    fn draw(&mut self, ctx: &mut miniquad::graphics::Context) {
        ctx.clear(Some((0., 0., 0., 1.)), None, None);
        self.what.borrow_mut().draw(ctx);
    }
}

pub fn render(app: Box<dyn App>) {
    miniquad::start(miniquad::conf::Conf::default(), move |mut ctx| {
        miniquad::UserData::owning(Stage::new(app), ctx)
    })
}

fn get_render(what: Renderable) -> Rc<RefCell<dyn RawRender>> {
    match what {
        Renderable::Element(ref el) => get_render(el.borrow_mut().render()),
        Renderable::RawRender(rr) => rr,
    }
}