use std::cell::RefCell;
use std::rc::Rc;
use std::sync::Arc;
use std::sync::atomic::AtomicBool;

use smithay::wayland::shm::init_shm_global;
use smithay::wayland::seat::Seat;
use smithay::wayland::output::{Mode, Output, PhysicalProperties};
use smithay::backend::input::InputBackend;
use smithay::backend::winit;
use smithay::backend::graphics::egl::EGLGraphicsBackend;
use smithay::backend::graphics::egl::wayland::EGLWaylandExtensions;
use smithay::wayland_server::{Display, EventLoop};
use smithay::wayland_server::protocol::wl_output;

use slog::Logger;

use glium_drawer::GliumDrawer;
use shell::init_shell;
use input_handler::AnvilInputHandler;

pub fn run_winit(display: &mut Display, event_loop: &mut EventLoop, log: Logger) -> Result<(), ()> {
    let (renderer, mut input) = winit::init(log.clone()).map_err(|_| ())?;

    let egl_display = Rc::new(RefCell::new(
        if let Ok(egl_display) = renderer.bind_wl_display(&display) {
            info!(log, "EGL hardware-acceleration enabled");
            Some(egl_display)
        } else {
            None
        },
    ));

    let (w, h) = renderer.get_framebuffer_dimensions();
    let drawer = GliumDrawer::from(renderer);

    let name = display.add_socket_auto().unwrap().into_string().unwrap();
    info!(log, "Listening on wayland socket"; "name" => name.clone());
    ::std::env::set_var("WAYLAND_DISPLAY", name);

    let running = Arc::new(AtomicBool::new(true));

    /*
     * Initialize the globals
     */

    init_shm_global(display, event_loop.token(), vec![], log.clone());

    let (compositor_token, _, _, window_map) =
        init_shell(display, event_loop.token(), log.clone(), egl_display);

    let (mut seat, _) = Seat::new(display, event_loop.token(), "winit".into(), log.clone());

    let pointer = seat.add_pointer();
    let keyboard = seat.add_keyboard("", "fr", "oss", None, 1000, 500)
        .expect("Failed to initialize the keyboard");

    let (output, _) = Output::new(
        display,
        event_loop.token(),
        "Winit".into(),
        PhysicalProperties {
            width: 0,
            height: 0,
            subpixel: wl_output::Subpixel::Unknown,
            maker: "Smithay".into(),
            model: "Winit".into(),
        },
        log.clone(),
    );

    output.change_current_state(
        Some(Mode {
            width: w as i32,
            height: h as i32,
            refresh: 60_000,
        }),
        None,
        None,
    );
    output.set_preferred(Mode {
        width: w as i32,
        height: h as i32,
        refresh: 60_000,
    });

    input.set_handler(AnvilInputHandler::new(
        log.clone(),
        pointer,
        keyboard,
        window_map.clone(),
        (0, 0),
        running.clone(),
        Rc::new(RefCell::new((0.0, 0.0))),
    ));

    info!(log, "Initialization completed, starting the main loop.");

    loop {
        input.dispatch_new_events().unwrap();

        drawer.draw_windows(&*window_map.borrow(), compositor_token, &log);

        event_loop.dispatch(Some(16)).unwrap();
        display.flush_clients();

        window_map.borrow_mut().refresh();
    }
}