use std::sync::{Arc, RwLock};
use raidillon_platform::Platform;
use glium::winit::event_loop::EventLoop;
use glium::winit::window::Window;
use glium::backend::glutin::Display;
use glium::glutin::surface::WindowSurface;
use glium::backend::glutin::SimpleWindowBuilder;
use glium::Surface;
use crate::system::{RenderingSystemManager, RenderingSystem, RenderingContext};
use winit::event::{Event, WindowEvent};
use raidillon_core::Engine;
use crate::GliumAssetManager;
use crate::render::BasicRenderingSystem;

pub struct GliumPlatform<RS: RenderingSystem> {
    event_loop: EventLoop<()>,
    window: Window,
    display: Display<WindowSurface>,
    rendering_system_manager: RenderingSystemManager<RS>,
    asset_manager: Arc<RwLock<GliumAssetManager>>,
}

impl<RS: RenderingSystem> Platform for GliumPlatform<RS> {
    fn initialize(title: String, width: u32, height: u32) -> Self {
        let event_loop = glium::winit::event_loop::EventLoop::builder()
            .build()
            .expect("create event-loop");

        let (window, display) = SimpleWindowBuilder::new()
            .with_title(title.as_str())
            .with_inner_size(width, height)
            .build(&event_loop);

        let asset_manager = Arc::new(RwLock::new(GliumAssetManager::new(Box::new(display.clone()))));
        let rendering_system_manager = RenderingSystemManager::new();
        Self {
            event_loop,
            window,
            display,
            rendering_system_manager,
            asset_manager,
        }
    }

    fn run(mut self, engine: Engine) {
        let _ = &self.event_loop.run(move |event, el| {
            match event {
                Event::WindowEvent { event, .. } => match event {
                    WindowEvent::CloseRequested => {},
                    WindowEvent::RedrawRequested => {
                        let mut target = self.display.draw();
                        target.clear_color(0.0, 0.0, 0.0, 1.0);
                        // TODO: let mut context;

                        for (system_id, system) in self.rendering_system_manager.systems.iter_mut() {
                            todo!();
                        }
                    }
                    _ => {},
                },
                Event::AboutToWait => {
                    // TODO: Run <engine: Engine> systems here
                    self.window.request_redraw();
                }
                _ => {},
            }
        });
    }
}