mod api_v1;
pub mod host_meta;
pub mod model;
pub mod nodeinfo;
mod rpc_v1;
pub mod service;
pub mod util;
pub mod web;
pub mod webfinger;

use crate::api_v1::create_api_router;
use crate::host_meta::handle_host_meta;
use crate::nodeinfo::{handle_nodeinfo, handle_nodeinfo_20, handle_nodeinfo_21};
use crate::service::MagnetarService;
use axum::routing::get;
use axum::Router;
use dotenvy::dotenv;
use futures::{select, FutureExt};
use magnetar_common::config::{MagnetarConfig, MagnetarRpcSocketKind};
use magnetar_model::{CacheConnectorConfig, CalckeyCache, CalckeyModel, ConnectorConfig};
use miette::{miette, IntoDiagnostic};
use rpc_v1::proto::{MagRpc, RpcMessage, RpcSockAddr};
use std::convert::Infallible;
use std::future::Future;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::net::TcpListener;
use tokio::signal;
use tower_http::cors::{Any, CorsLayer};
use tower_http::trace::TraceLayer;
use tracing::log::error;
use tracing::{debug, info};
use tracing_subscriber::EnvFilter;

#[tokio::main]
async fn main() -> miette::Result<()> {
    dotenv().ok();

    let filter_layer = EnvFilter::try_from_default_env()
        .or_else(|_| EnvFilter::try_new("info"))
        .unwrap();

    tracing_subscriber::fmt()
        .with_env_filter(filter_layer)
        .with_test_writer()
        .init();

    let config = &*Box::leak::<'static>(Box::new(
        magnetar_common::config::load_config().into_diagnostic()?,
    ));
    info!("Loaded configuration: {config:#?}");

    let db = CalckeyModel::new(ConnectorConfig {
        url: config.data.database_url.clone(),
    })
        .await
        .into_diagnostic()?;

    db.migrate().await.into_diagnostic()?;

    let redis = CalckeyCache::new(CacheConnectorConfig {
        url: config.data.redis_url.clone(),
    })
        .into_diagnostic()?;

    let service = Arc::new(
        MagnetarService::new(config, db.clone(), redis)
            .await
            .into_diagnostic()?,
    );

    let shutdown_signal = shutdown_signal().shared();

    select! {
        rpc_res = run_rpc(service.clone(), config, shutdown_signal.clone()).fuse() => rpc_res,
        web_res = run_web(service, config, shutdown_signal).fuse() => web_res
    }
}

async fn run_rpc(
    service: Arc<MagnetarService>,
    config: &'static MagnetarConfig,
    shutdown_signal: impl Future<Output=()> + Send + 'static,
) -> miette::Result<()> {
    let rpc_bind_addr = match &config.rpc.connection_settings {
        MagnetarRpcSocketKind::None => {
            std::future::pending::<Infallible>().await;
            unreachable!();
        }
        MagnetarRpcSocketKind::Unix(path) => RpcSockAddr::Unix(path.clone()),
        MagnetarRpcSocketKind::Tcp(ip) => RpcSockAddr::Ip(*ip),
    };

    let rpc = MagRpc::new().handle(
        "/ping",
        |_, RpcMessage(message): RpcMessage<String>| async move {
            debug!("Received RPC ping: {}", message);
            RpcMessage("pong".to_owned())
        },
    );

    rpc.run(service, rpc_bind_addr, Some(shutdown_signal)).await
}

async fn run_web(
    service: Arc<MagnetarService>,
    config: &'static MagnetarConfig,
    shutdown_signal: impl Future<Output=()> + Send + 'static,
) -> miette::Result<()> {
    let well_known_router = Router::new()
        .route(
            "/webfinger",
            get(webfinger::handle_webfinger).with_state((config, service.db.clone())),
        )
        .route("/host-meta", get(handle_host_meta))
        .route("/nodeinfo", get(handle_nodeinfo));

    let nodeinfo_router = Router::new()
        .with_state(config)
        .route("/2.0", get(handle_nodeinfo_20))
        .route("/2.1", get(handle_nodeinfo_21));

    let app = Router::new()
        .nest("/.well-known", well_known_router.with_state(config))
        .nest("/nodeinfo", nodeinfo_router.with_state(config))
        .nest("/mag/v1", create_api_router(service))
        .layer(
            CorsLayer::new()
                .allow_headers(Any)
                .allow_methods(Any)
                .allow_origin(Any),
        )
        .layer(TraceLayer::new_for_http());

    let addr = SocketAddr::from((config.networking.bind_addr, config.networking.port));
    info!("Binding to: {addr}");
    let listener = TcpListener::bind(addr).await.into_diagnostic()?;
    info!("Serving...");
    axum::serve(listener, app.into_make_service())
        .with_graceful_shutdown(shutdown_signal)
        .await
        .map_err(|e| miette!("Error running server: {}", e))
}

async fn shutdown_signal() {
    let ctrl_c = async {
        if let Err(e) = signal::ctrl_c().await {
            error!("Ctrl+C signal handler error: {}", e);
        }
    };

    #[cfg(unix)]
    let terminate = async {
        signal::unix::signal(signal::unix::SignalKind::terminate())
            .expect("SIGTERM handler error")
            .recv()
            .await;
    };

    #[cfg(not(unix))]
    let terminate = std::future::pending::<()>();

    tokio::select! {
        _ = ctrl_c => {},
        _ = terminate => {},
    }

    info!("Received a signal to shut down...");
}