#![feature(trait_upcasting)]

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

use std::path;

#[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,
        help = "Path to config file",
        required = true,
        env = "DOMANI_CONFIG_PATH"
    )]
    config_path: path::PathBuf,
}

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

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

    let config = {
        let mut config: domani::config::Config = {
            let path = &cli.config_path;
            let f = std::fs::File::open(path).unwrap_or_else(|e| {
                panic!("failed to open config file at {}: {e}", path.display())
            });
            serde_yaml::from_reader(f).unwrap_or_else(|e| {
                panic!("failed to parse config file at {}: {e}", path.display())
            })
        };

        // primary_cname is a CNAME record which points to the primary domain of the service. Since
        // the primary domain _must_ point to the service (otherwise HTTPS wouldn't work) it's
        // reasonable to assume that a CNAME on any domain would suffice to point that domain to
        // the service.
        let primary_cname = domani::service::ConfigDNSRecord::CNAME {
            name: config.service.primary_domain.clone(),
        };

        let dns_records_have_primary_cname = config
            .service
            .dns_records
            .iter()
            .any(|r| r == &primary_cname);

        if !dns_records_have_primary_cname {
            log::info!(
                "Adding 'CNAME {}' to service.dns_records",
                &config.service.primary_domain
            );
            config.service.dns_records.push(primary_cname);
        }

        config
    };

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

    let domain_checker = domani::domain::checker::DNSChecker::new(
        domani::token::MemStore::new(),
        &config.domain.dns,
        config.service.primary_domain.clone(),
    )
    .await
    .expect("domain checker initialization failed");

    let domain_store =
        domani::domain::store::FSStore::new(&config.domain.store_dir_path.join("domains"))
            .expect("domain config store initialization failed");

    let domain_store =
        domani::domain::store::StoreWithBuiltin::new(domain_store, config.domain.builtins);

    let domain_acme_manager = if config.service.http.https_addr.is_some() {
        let acme_config = config
            .domain
            .acme
            .expect("acme configuration must be set if https is enabled");

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

        Some(
            domani::domain::acme::manager::ManagerImpl::new(
                domain_acme_store,
                domani::token::MemStore::new(),
                &acme_config,
            )
            .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_store,
        domain_checker,
        domain_acme_manager,
    );

    let _ = domani::service::http::new(
        &mut task_stack,
        domain_manager.clone(),
        domain_manager.clone(),
        config.service,
    );

    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");
}