/*
 * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
 *
 * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
 *
 * Modified by Coffey Labs in 2026 for INBUXA.
 */

#![warn(clippy::large_futures)]
#![warn(clippy::cast_possible_truncation)]
#![warn(clippy::cast_possible_wrap)]
#![warn(clippy::cast_sign_loss)]

use common::{
    BuildServer, Inner,
    config::server::{Listener, ServerProtocol},
    manager::boot::BootManager,
    network::TcpAcceptor,
};
use http::HttpSessionManager;
use imap::core::ImapSessionManager;
use managesieve::core::ManageSieveSessionManager;
use pop3::Pop3SessionManager;
use services::{StartServices, broadcast::subscriber::spawn_broadcast_subscriber};
use smtp::{StartQueueManager, core::SmtpSessionManager};
use std::sync::Arc;
use std::time::Duration;
use tokio::sync::watch;
use trc::Collector;
use utils::wait_for_shutdown;

#[cfg(feature = "dev_mode")]
pub mod test_data;

#[cfg(not(any(target_env = "msvc", target_os = "freebsd")))]
use tikv_jemallocator::Jemalloc;

#[cfg(not(any(target_env = "msvc", target_os = "freebsd")))]
#[global_allocator]
static GLOBAL: Jemalloc = Jemalloc;

#[tokio::main]
async fn main() -> std::io::Result<()> {
    // Install AWS-LC-RS as the default Rustls crypto provider
    rustls::crypto::aws_lc_rs::default_provider()
        .install_default()
        .expect("failed to install aws-lc-rs as the default rustls crypto provider");

    // Build the shared outbound TLS configurations
    utils::http::init_shared_tls_configs();

    // Load config and apply macros
    let mut init = Box::pin(BootManager::init()).await;

    // Migrate database
    if let Err(err) = migration::try_migrate(&init.inner.build_server()).await {
        trc::event!(
            Server(trc::ServerEvent::StartupError),
            Details = "Failed to migrate database, aborting startup.",
            Reason = err,
        );
        return Ok(());
    }

    // Init services
    init.start_services().await;
    init.start_queue_manager();

    // Log configuration errors
    init.bootstrap.log_errors();
    init.bootstrap.log_warnings();


    #[cfg(feature = "dev_mode")]
    if std::env::var("INSERT_TEST_DATA").is_ok() {
        let server = init.inner.build_server();
        test_data::insert_test_data(&server).await;
        server.insert_test_metrics().await;
    }

    // Spawn servers
    // Each listener gets its own shutdown channel, registered under its id, so
    // the legacy-protocols switch can close one protocol's ports and leave the
    // rest accepting (legacy-protocols LP-2). The registry lives in `Data` and
    // so outlives the listeners, which it must: it owns the sending ends.
    let listener_control = &init.inner.data.listener_control;
    let spawn_inner = init.inner.clone();
    let (shutdown_tx, shutdown_rx) =
        init.servers
            .spawn_with_control(listener_control, |server, acceptor, shutdown_rx| {
                spawn_listener(&spawn_inner, server, acceptor, shutdown_rx);
            });

    // Leave behind how to spawn a listener, so putting one back opens its port
    // without a restart (LP-5). Only this file knows the session manager for a
    // protocol, so only this file can say.
    let spawn_inner = init.inner.clone();
    init.inner
        .data
        .listener_control
        .set_spawner(Box::new(move |server, acceptor, shutdown_rx| {
            spawn_listener(&spawn_inner, server, acceptor, shutdown_rx);
        }));

    // Start broadcast subscriber
    let inner = init.inner.clone();
    spawn_broadcast_subscriber(init.inner, shutdown_rx);

    // Wait for shutdown signal
    wait_for_shutdown().await;

    // Shutdown collector
    Collector::shutdown();

    // Stop services, then the listeners: the shutdown sender no longer reaches
    // them, since each holds its own channel (LP-2).
    let _ = shutdown_tx.send(true);
    inner.data.listener_control.stop_all();

    // Wait for services to finish
    tokio::time::sleep(Duration::from_secs(1)).await;

    Ok(())
}

/// Starts one listener under the session manager its protocol calls for.
///
/// Used twice: once for every listener at startup, and again whenever the
/// legacy-protocols switch puts a listener back (LP-5).
fn spawn_listener(
    inner: &Arc<Inner>,
    server: Listener,
    acceptor: TcpAcceptor,
    shutdown_rx: watch::Receiver<bool>,
) {
    match &server.protocol {
        ServerProtocol::Smtp | ServerProtocol::Lmtp => server.spawn(
            SmtpSessionManager::new(inner.clone()),
            inner.clone(),
            acceptor,
            shutdown_rx,
        ),
        ServerProtocol::Http => server.spawn(
            HttpSessionManager::new(inner.clone()),
            inner.clone(),
            acceptor,
            shutdown_rx,
        ),
        ServerProtocol::Imap => server.spawn(
            ImapSessionManager::new(inner.clone()),
            inner.clone(),
            acceptor,
            shutdown_rx,
        ),
        ServerProtocol::Pop3 => server.spawn(
            Pop3SessionManager::new(inner.clone()),
            inner.clone(),
            acceptor,
            shutdown_rx,
        ),
        ServerProtocol::ManageSieve => server.spawn(
            ManageSieveSessionManager::new(inner.clone()),
            inner.clone(),
            acceptor,
            shutdown_rx,
        ),
    }
}