mod misc;
mod render;
mod resources;
mod systems;

use specs::{Dispatcher, DispatcherBuilder, World};

use crate::Error;

use misc::{Events, TextManager, Window};
use render::{Debug, Init, Test};
use resources::{Camera, Geometry, State};
use systems::StateUpdate;

pub struct App<'a, 'b> {
    is_running: bool,
    events: Events,
    window: Window,
    dispatcher: Dispatcher<'a, 'b>,
}

impl<'a, 'b> App<'a, 'b> {
    pub fn new(world: &mut World) -> Result<Self, Error> {
        let events = Events::new(world);
        let window = Window::new(events.handle())?;

        world.insert(Camera::new()?);
        world.insert(Geometry::new()?);
        world.insert(State::default());

        let text_manager = TextManager::new(world)?;

        let mut dispatcher = DispatcherBuilder::new()
            .with(StateUpdate::new(world)?, "state_update", &[])
            .with_thread_local(Init::new(world)?)
            .with_thread_local(Test::new(world)?)
            .with_thread_local(Debug::new(&text_manager)?)
            .build();
        dispatcher.setup(world);

        Ok(Self {
            is_running: true,
            events,
            window,
            dispatcher,
        })
    }

    pub fn is_running(&self) -> bool {
        self.is_running
    }

    pub fn process(&mut self, world: &World) -> Result<(), Error> {
        self.events.process(world);
        self.dispatcher.dispatch(world);

        self.window.swap_buffers()?;

        self.is_running = !world.fetch::<State>().close_requested;

        Ok(())
    }
}