#![feature(trait_upcasting)]

use clap::Parser;
use futures::stream::StreamExt;
use signal_hook_tokio::Signals;

use std::net::SocketAddr;
use std::path;
use std::str::FromStr;

#[derive(Parser, Debug)]
#[command(version)]
#[command(about = "A domani to another dimension")]
struct Cli {
    #[arg(
        long,
        help = "OFF, ERROR, WARN, INFO, DEBUG, or TRACE",
        default_value_t = log::LevelFilter::Info,
        env = "DOMANI_LOG_LEVEL"
    )]
    log_level: log::LevelFilter,

    #[arg(long, default_value_t = false, env = "DOMANI_LOG_TIMESTAMP")]
    log_timestamp: bool,

    #[arg(long, required = true, env = "DOMANI_HTTP_DOMAIN")]
    http_domain: domani::domain::Name,

    #[arg(long, default_value_t = SocketAddr::from_str("[::]:3030").unwrap(), env = "DOMANI_HTTP_LISTEN_ADDR")]
    http_listen_addr: SocketAddr,

    #[arg(
        long,
        help = "E.g. '[::]:443', if given then SSL certs will automatically be retrieved for all domains using LetsEncrypt",
        env = "DOMANI_HTTPS_LISTEN_ADDR",
        requires = "domain_acme_contact_email",
        requires = "domain_acme_store_dir_path"
    )]
    https_listen_addr: Option<SocketAddr>,

    #[arg(long, required = true, env = "DOMANI_PASSPHRASE")]
    passphrase: String,

    #[arg(long, required = true, env = "DOMANI_ORIGIN_STORE_GIT_DIR_PATH")]
    origin_store_git_dir_path: path::PathBuf,

    #[arg(long, required = true, env = "DOMANI_DOMAIN_CHECKER_TARGET_A")]
    domain_checker_target_a: std::net::Ipv4Addr,

    #[arg(long, default_value_t = String::from("1.1.1.1:53"), env = "DOMANI_DOMAIN_CHECKER_RESOLVER_ADDR")]
    domain_checker_resolver_addr: String,

    #[arg(long, required = true, env = "DOMANI_DOMAIN_CONFIG_STORE_DIR_PATH")]
    domain_config_store_dir_path: path::PathBuf,

    #[arg(long, env = "DOMANI_DOMAIN_ACME_STORE_DIR_PATH")]
    domain_acme_store_dir_path: Option<path::PathBuf>,

    #[arg(long, env = "DOMANI_DOMAIN_ACME_CONTACT_EMAIL")]
    domain_acme_contact_email: Option<String>,
}

#[tokio::main]
async fn main() {
    let config = Cli::parse();

    env_logger::Builder::new()
        .filter_level(config.log_level)
        .format_timestamp(
            config
                .log_timestamp
                .then_some(env_logger::TimestampPrecision::Micros),
        )
        .init();

    let origin_config = domani::origin::Config {
        store_dir_path: config.origin_store_git_dir_path,
    };

    let origin_store = domani::origin::git::FSStore::new(&origin_config)
        .expect("git origin store initialization failed");

    let domain_checker = domani::domain::checker::DNSChecker::new(
        config.domain_checker_target_a,
        &config.domain_checker_resolver_addr,
    )
    .await
    .expect("domain checker initialization failed");

    let domain_config_store =
        domani::domain::store::FSStore::new(&config.domain_config_store_dir_path)
            .expect("domain config store initialization failed");

    let domain_acme_manager = if config.https_listen_addr.is_some() {
        let domain_acme_store_dir_path = config.domain_acme_store_dir_path.unwrap();

        let domain_acme_store =
            domani::domain::acme::store::FSStore::new(&domain_acme_store_dir_path)
                .expect("domain acme store initialization failed");

        // if https_listen_addr is set then domain_acme_contact_email is required, see the Cli/clap
        // settings.
        let domain_acme_contact_email = config.domain_acme_contact_email.unwrap();

        Some(
            domani::domain::acme::manager::ManagerImpl::new(
                domain_acme_store,
                &domain_acme_contact_email,
            )
            .await
            .expect("domain acme manager initialization failed"),
        )
    } else {
        None
    };

    let mut task_stack = domani::util::TaskStack::new();

    let domain_manager = domani::domain::manager::ManagerImpl::new(
        &mut task_stack,
        origin_store,
        domain_config_store,
        domain_checker,
        domain_acme_manager,
    );

    let _ = domani::service::http::new(
        &mut task_stack,
        domain_manager.clone(),
        domain_manager.clone(),
        domani::service::http::Config {
            http_addr: config.http_listen_addr,
            https_addr: config.https_listen_addr,
            primary_domain: config.http_domain,
            target_a: config.domain_checker_target_a,
            passphrase: config.passphrase,
        },
    );

    let mut signals =
        Signals::new(signal_hook::consts::TERM_SIGNALS).expect("initializing signals failed");

    if (signals.next().await).is_some() {
        log::info!("Gracefully shutting down...");
    }

    tokio::spawn(async move {
        if (signals.next().await).is_some() {
            log::warn!("Forcefully shutting down");
            std::process::exit(1);
        };
    });

    task_stack
        .stop()
        .await
        .expect("failed to stop all background tasks");

    log::info!("Graceful shutdown complete");
}