use ::app::get_router;
use axum::body::Body;
use axum::http::Request;
use listenfd::ListenFd;
use notify::Watcher;
use std::env;
use std::path::Path;
use tokio::net::TcpListener;
use tower_livereload::predicate::Predicate;
use tower_livereload::LiveReloadLayer;

/// Nous filtrons les requêtes de `htmx` pour ne pas inclure le script _JS_ qui gère le rechargement
/// Voir https://github.com/leotaku/tower-livereload/pull/3
#[derive(Copy, Clone)]
struct NotHtmxPredicate;
impl<T> Predicate<Request<T>> for NotHtmxPredicate {
    fn check(&mut self, req: &Request<T>) -> bool {
        !(req.headers().contains_key("hx-request"))
    }
}

const DEFAULT_LISTENER: &str = "localhost:3000";
async fn get_tcp_listener() -> TcpListener {
    let mut listenfd = ListenFd::from_env();

    match listenfd.take_tcp_listener(0).unwrap() {
        // if we are given a tcp listener on listen fd 0, we use that one
        Some(listener) => {
            listener.set_nonblocking(true).unwrap();
            TcpListener::from_std(listener).unwrap()
        }
        // otherwise fall back to local listening
        None => TcpListener::bind(DEFAULT_LISTENER).await.unwrap(),
    }
}

fn get_livereload_layer(templates_path: &Path) -> LiveReloadLayer<NotHtmxPredicate> {
    let livereload = LiveReloadLayer::new();
    let reloader = livereload.reloader();
    let mut watcher = notify::recommended_watcher(move |_| reloader.reload()).unwrap();
    watcher
        .watch(templates_path, notify::RecursiveMode::Recursive)
        .unwrap();
    livereload.request_predicate::<Body, NotHtmxPredicate>(NotHtmxPredicate)
}

#[tokio::main]
async fn main() {
    let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
    let assets_path = Path::new(&manifest_dir).join("assets");
    let templates_path = Path::new(&manifest_dir).join("templates");

    let livereload_layer = get_livereload_layer(&templates_path);
    let router = get_router(assets_path.as_path()).layer(livereload_layer);

    let listener: TcpListener = get_tcp_listener().await;
    println!("Listening on: http://{}", listener.local_addr().unwrap());

    // Run the server with the router
    axum::serve(listener, router.into_make_service())
        .await
        .unwrap();
}