use std::time::Instant;
use glam::{vec3, vec4, UVec2};
use glium::{backend::glutin::SimpleWindowBuilder, Surface};
use winit::{
  event::{Event, WindowEvent},
  event_loop::{EventLoopBuilder, ControlFlow}
};
use hui::{
  UiInstance,
  element::{
    ElementList, UiElementListExt,
    container::Container,
    text::Text,
  },
  layout::{Alignment, UiDirection, UiSize},
  rectangle::{Corners, Sides},
};
use hui_glium::GliumUiRenderer;

fn main() {
  kubi_logging::init();

  let event_loop = EventLoopBuilder::new().build().unwrap();
  let (_window, display) = SimpleWindowBuilder::new().build(&event_loop);

  let mut hui = UiInstance::new();
  let mut backend = GliumUiRenderer::new(&display);

  event_loop.run(|event, window_target| {
    window_target.set_control_flow(ControlFlow::Poll);
    match event {
      Event::WindowEvent { event: WindowEvent::CloseRequested, .. } => {
        window_target.exit();
      },
      Event::AboutToWait => {
        let mut frame = display.draw();
        frame.clear_color_srgb(0.5, 0.5, 0.5, 0.);

        let resolution = UVec2::from(display.get_framebuffer_dimensions()).as_vec2();

        hui.begin();

        hui.add({
          Container::default()
            .with_size((UiSize::Fraction(1.), UiSize::Fraction(1.)))
            .with_padding(Sides::all(5.))
            .with_background(vec3(1., 0., 0.))
            .with_children(|ui: &mut ElementList| {
              Text::default()
                .with_text("Hello, world")
                .with_text_size(120)
                .with_color(vec4(0., 0., 0., 1.))
                .add_to(ui);
            })
        }, resolution);

        hui.end();

        backend.update(&hui);
        backend.draw(&mut frame, resolution);

        frame.finish().unwrap();
      }
      _ => (),
    }
  }).unwrap();
}