use anymap::AnyMap;
use glium::{framebuffer::SimpleFrameBuffer, glutin::event::Event, Display, Frame, Surface};

mod test_state;
pub use test_state::TestState;

pub trait GameState {
    fn input(&mut self, resources: &mut AnyMap, event: &Event<()>);
    fn update(&mut self, resources: &mut AnyMap, dt: f32) -> Option<Box<dyn GameState>>;
    fn render(&mut self, resources: &mut AnyMap, display: &Display, target: &mut SimpleFrameBuffer);
}

pub struct DummyState;

impl GameState for DummyState {
    fn update(&mut self, _resourcess: &mut AnyMap, _dt: f32) -> Option<Box<dyn GameState>> {
        None
    }

    fn input(&mut self, _resources: &mut AnyMap, _event: &Event<()>) {}

    fn render(
        &mut self,
        _resources: &mut AnyMap,
        _display: &Display,
        _target: &mut SimpleFrameBuffer,
    ) {
    }
}