// Copyright (C) 2024-2026 Whiterun LLC
//
// This software is licensed under the GNU Affero General Public License (AGPL), version 3.0 or later.
// A copy of the license can be found in the LICENSE file or at https://www.gnu.org/licenses/agpl-3.0.html

use rocket::fairing::{Fairing, Info, Kind};
use rocket::{Orbit, Rocket};
use std::sync::atomic::{AtomicBool, Ordering};

static SHUTDOWN_FLAG: AtomicBool = AtomicBool::new(false);

/// Returns true if a shutdown has been requested.
pub fn shutdown_requested() -> bool {
    SHUTDOWN_FLAG.load(Ordering::Relaxed)
}

/// Requests a graceful shutdown of all background threads.
pub fn request_shutdown() {
    SHUTDOWN_FLAG.store(true, Ordering::SeqCst);
}

/// Rocket fairing that calls `request_shutdown()` when Rocket shuts down.
pub struct ShutdownFairing;

#[rocket::async_trait]
impl Fairing for ShutdownFairing {
    fn info(&self) -> Info {
        Info {
            name: "Shutdown Fairing",
            kind: Kind::Shutdown,
        }
    }

    async fn on_shutdown(&self, _rocket: &Rocket<Orbit>) {
        log::info!("Shutdown signal received, requesting graceful shutdown...");
        request_shutdown();
    }
}