mod auth;
pub mod client_ip;
mod export;
mod headers;
mod health;
mod import;
mod input;
mod key;
mod output;
mod params;
mod rpc;
mod signals;
mod signin;
mod signup;
mod sql;
mod sync;
mod tracer;
mod version;

use axum::response::Redirect;
use axum::routing::get;
use axum::{middleware, Router};
use axum_server::Handle;
use http::header;
use std::net::SocketAddr;
use std::sync::Arc;
use std::time::Duration;
use tower::ServiceBuilder;
use tower_http::add_extension::AddExtensionLayer;
use tower_http::auth::AsyncRequireAuthorizationLayer;
use tower_http::cors::{Any, CorsLayer};
use tower_http::request_id::MakeRequestUuid;
use tower_http::sensitive_headers::{
	SetSensitiveRequestHeadersLayer, SetSensitiveResponseHeadersLayer,
};
use tower_http::trace::TraceLayer;
use tower_http::ServiceBuilderExt;

use crate::cli::CF;
use crate::cnf;
use crate::err::Error;
use crate::net::signals::graceful_shutdown;
use crate::telemetry::metrics::HttpMetricsLayer;
use axum_server::tls_rustls::RustlsConfig;

const LOG: &str = "surrealdb::net";

///
/// AppState is used to share data between routes.
///
#[derive(Clone)]
struct AppState {
	client_ip: client_ip::ClientIp,
}

pub async fn init() -> Result<(), Error> {
	// Get local copy of options
	let opt = CF.get().unwrap();

	let app_state = AppState {
		client_ip: opt.client_ip,
	};

	// Specify headers to be obfuscated from all requests/responses
	let headers: Arc<[_]> = Arc::new([
		header::AUTHORIZATION,
		header::PROXY_AUTHORIZATION,
		header::COOKIE,
		header::SET_COOKIE,
	]);

	// Build the middleware to our service.
	let service = ServiceBuilder::new()
		.catch_panic()
		.set_x_request_id(MakeRequestUuid)
		.propagate_x_request_id()
		.layer(AddExtensionLayer::new(app_state))
		.layer(middleware::from_fn(client_ip::client_ip_middleware))
		.layer(SetSensitiveRequestHeadersLayer::from_shared(Arc::clone(&headers)))
		.layer(
			TraceLayer::new_for_http()
				.make_span_with(tracer::HttpTraceLayerHooks)
				.on_request(tracer::HttpTraceLayerHooks)
				.on_response(tracer::HttpTraceLayerHooks)
				.on_failure(tracer::HttpTraceLayerHooks),
		)
		.layer(HttpMetricsLayer)
		.layer(SetSensitiveResponseHeadersLayer::from_shared(headers))
		.layer(AsyncRequireAuthorizationLayer::new(auth::SurrealAuth))
		.layer(headers::add_server_header())
		.layer(headers::add_version_header())
		.layer(
			CorsLayer::new()
				.allow_methods([
					http::Method::GET,
					http::Method::PUT,
					http::Method::POST,
					http::Method::PATCH,
					http::Method::DELETE,
					http::Method::OPTIONS,
				])
				.allow_headers([
					http::header::ACCEPT,
					http::header::AUTHORIZATION,
					http::header::CONTENT_TYPE,
					http::header::ORIGIN,
					headers::NS.parse().unwrap(),
					headers::DB.parse().unwrap(),
					headers::ID.parse().unwrap(),
				])
				// allow requests from any origin
				.allow_origin(Any)
				.max_age(Duration::from_secs(86400)),
		);

	let axum_app = Router::new()
		// Redirect until we provide a UI
		.route("/", get(|| async { Redirect::temporary(cnf::APP_ENDPOINT) }))
		.route("/status", get(|| async {}))
		.merge(health::router())
		.merge(export::router())
		.merge(import::router())
		.merge(rpc::router())
		.merge(version::router())
		.merge(sync::router())
		.merge(sql::router())
		.merge(signin::router())
		.merge(signup::router())
		.merge(key::router())
		.layer(service);

	// Setup the graceful shutdown with no timeout
	let handle = Handle::new();
	let shutdown_handler = graceful_shutdown(handle.clone());

	if let (Some(cert), Some(key)) = (&opt.crt, &opt.key) {
		// configure certificate and private key used by https
		let tls = RustlsConfig::from_pem_file(cert, key).await.unwrap();

		let server = axum_server::bind_rustls(opt.bind, tls);

		info!(target: LOG, "Started web server on {}", &opt.bind);

		server
			.handle(handle)
			.serve(axum_app.into_make_service_with_connect_info::<SocketAddr>())
			.await?;
	} else {
		let server = axum_server::bind(opt.bind);

		info!(target: LOG, "Started web server on {}", &opt.bind);

		server
			.handle(handle)
			.serve(axum_app.into_make_service_with_connect_info::<SocketAddr>())
			.await?;
	};

	// Wait for the shutdown to finish
	let _ = shutdown_handler.await;

	// Flush all telemetry data
	opentelemetry::global::shutdown_tracer_provider();

	info!(target: LOG, "Web server stopped. Bye!");

	Ok(())
}