use actix_cors::Cors;
use actix_web::{
    dev::Service, http::Method, middleware::Logger as ActixLogger, web, App, HttpResponse,
    HttpServer,
};
use tokio::sync::Mutex;

use fedimovies::activitypub::views as activitypub;
use fedimovies::atom::views::atom_scope;
use fedimovies::http::{
    create_auth_error_handler, create_default_headers_middleware, json_error_handler,
};
use fedimovies::job_queue::scheduler;
use fedimovies::logger::configure_logger;
use fedimovies::mastodon_api::accounts::views::account_api_scope;
use fedimovies::mastodon_api::apps::views::application_api_scope;
use fedimovies::mastodon_api::custom_emojis::views::custom_emoji_api_scope;
use fedimovies::mastodon_api::directory::views::directory_api_scope;
use fedimovies::mastodon_api::instance::views::instance_api_scope;
use fedimovies::mastodon_api::markers::views::marker_api_scope;
use fedimovies::mastodon_api::media::views::media_api_scope;
use fedimovies::mastodon_api::notifications::views::notification_api_scope;
use fedimovies::mastodon_api::oauth::views::oauth_api_scope;
use fedimovies::mastodon_api::search::views::search_api_scope;
use fedimovies::mastodon_api::settings::views::settings_api_scope;
use fedimovies::mastodon_api::statuses::views::status_api_scope;
use fedimovies::mastodon_api::subscriptions::views::subscription_api_scope;
use fedimovies::mastodon_api::timelines::views::timeline_api_scope;
use fedimovies::nodeinfo::views as nodeinfo;
use fedimovies::web_client::views as web_client;
use fedimovies::webfinger::views as webfinger;
use fedimovies_config::{parse_config, Environment, REEF_VERSION};
use fedimovies_models::database::migrate::apply_migrations;
use fedimovies_models::database::{create_pool, get_database_client};

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    let (config, config_warnings) = parse_config();
    configure_logger(config.log_level);
    log::info!("config loaded from {}", config.config_path);
    for warning in config_warnings {
        log::warn!("{}", warning);
    }

    // https://wiki.postgresql.org/wiki/Number_Of_Database_Connections
    let db_pool_size = num_cpus::get() * 2;
    let db_pool = create_pool(
        &config.database_url,
        config.tls_ca_file.as_deref(),
        db_pool_size,
    );
    let mut db_client = get_database_client(&db_pool).await.unwrap();
    apply_migrations(&mut db_client).await;

    if !config.media_dir().exists() {
        std::fs::create_dir(config.media_dir()).expect("failed to create media directory");
    };
    std::mem::drop(db_client);
    log::info!(
        "app initialized; version {}, environment = '{:?}'",
        REEF_VERSION,
        config.environment,
    );

    scheduler::run(config.clone(), db_pool.clone());
    log::info!("scheduler started");

    let num_workers = std::cmp::max(num_cpus::get(), 4);
    let http_socket_addr = format!("{}:{}", config.http_host, config.http_port,);
    // Mutex is used to make server process incoming activities sequentially
    let inbox_mutex = web::Data::new(Mutex::new(()));

    let http_server = HttpServer::new(move || {
        let cors_config = match config.environment {
            Environment::Development => Cors::permissive(),
            Environment::Production => {
                let mut cors_config = Cors::default();
                for origin in config.http_cors_allowlist.iter() {
                    cors_config = cors_config.allowed_origin(origin);
                }
                cors_config
                    .allowed_origin(&config.instance_url())
                    .allowed_origin_fn(|origin, req_head| {
                        req_head.method == Method::GET
                            || origin.as_bytes().starts_with(b"http://localhost:")
                    })
                    .allow_any_method()
                    .allow_any_header()
                    .expose_any_header()
            }
        };
        let payload_size_limit = 2 * config.limits.media.file_size_limit;
        let mut app = App::new()
            .wrap(cors_config)
            .wrap(ActixLogger::new("%r : %s : %{r}a"))
            .wrap_fn(|req, srv| {
                // Always log server errors (500-599)
                let fut = srv.call(req);
                async {
                    let res = fut.await?;
                    if let Some(error) = res.response().error() {
                        if error.as_response_error().status_code().is_server_error() {
                            log::warn!(
                                "{} {} : {}",
                                res.request().method(),
                                res.request().path(),
                                error,
                            );
                        };
                    };
                    Ok(res)
                }
            })
            .wrap(create_auth_error_handler())
            .wrap(create_default_headers_middleware())
            .app_data(web::PayloadConfig::default().limit(payload_size_limit))
            .app_data(
                web::JsonConfig::default()
                    .limit(payload_size_limit)
                    .error_handler(json_error_handler),
            )
            .app_data(web::Data::new(config.clone()))
            .app_data(web::Data::new(db_pool.clone()))
            .app_data(web::Data::clone(&inbox_mutex))
            .service(actix_files::Files::new("/media", config.media_dir()))
            .service(oauth_api_scope())
            .service(account_api_scope())
            .service(application_api_scope())
            .service(custom_emoji_api_scope())
            .service(directory_api_scope())
            .service(instance_api_scope())
            .service(marker_api_scope())
            .service(media_api_scope())
            .service(notification_api_scope())
            .service(search_api_scope())
            .service(settings_api_scope())
            .service(status_api_scope())
            .service(subscription_api_scope())
            .service(timeline_api_scope())
            .service(webfinger::webfinger_view)
            .service(activitypub::actor_scope())
            .service(activitypub::instance_actor_scope())
            .service(activitypub::object_view)
            .service(activitypub::emoji_view)
            .service(activitypub::tag_view)
            .service(atom_scope())
            .service(nodeinfo::get_nodeinfo_jrd)
            .service(nodeinfo::get_nodeinfo_2_0)
            .service(nodeinfo::get_nodeinfo_2_1)
            .service(web_client::profile_page_redirect())
            .service(web_client::profile_acct_page_redirect())
            .service(web_client::post_page_redirect())
            .service(
                // Fallback for well-known paths
                web::resource("/.well-known/{path}").to(HttpResponse::NotFound),
            );
        if let Some(ref web_client_dir) = config.web_client_dir {
            app = app.service(web_client::static_service(web_client_dir));
        };
        app
    });

    log::info!("listening on {}", http_socket_addr);
    http_server
        .workers(num_workers)
        .bind(http_socket_addr)?
        .run()
        .await
}