use std::net::SocketAddr;
use std::pin::Pin;
use std::sync::Arc;

use axum::handler::HandlerWithoutStateExt;
use axum::response::IntoResponse;
use std::error::Error;
use tokio::net::TcpListener;

pub type AnyError = Box<dyn Error + Send + Sync + 'static>;
pub type Result<T> = core::result::Result<T, AnyError>;

pub type Dbs = atelier::rusqlite_thread_pool::PoolSender;

fn migrate(connection: &mut rusqlite::Connection) -> Result<()> {
	Ok(())
}

fn init(connection: &mut rusqlite::Connection) -> rusqlite::Result<()> {
	Ok(())
}

type Request = axum::extract::Request;
type Response = axum::response::Response;
type Handler = Box<
	dyn Fn(Request) -> Pin<Box<dyn Future<Output = Response> + Send + 'static>>
		+ Send
		+ Sync
		+ 'static,
>;
type Router = atelier::router::Router<Handler>;

fn make_handler<Fut, F>(f: F) -> Handler
where
	Fut: Future<Output = Response> + Send + 'static,
	F: FnMut(Request) -> Fut + Clone + Send + Sync + 'static,
{
	Box::new(move |req| {
		let mut f = f.clone();
		Box::pin(async move { f(req).await })
	})
}

async fn get_hello(req: Request) -> Response {
	"hello".into_response()
}

fn make_router() -> Router {
	let mut router = atelier::router::Router::new();

	macro_rules! r {
		($m:expr, $p:expr, $h:expr) => {
			router.register($m.to_string(), $p.to_string(), make_handler($h))
		};
	}

	r!("GET", "/hello", get_hello);

	router
}

async fn serve(
	dbs: Dbs,
	router: Arc<Router>,
	req: axum::extract::Request,
) -> axum::response::Response {
	let method = req.method().as_str();
	let uri = format!("{}", req.uri());

	let (handler, pathParams) = match router.get(method, &uri) {
		Ok(h) => h,
		Err(sc) => {
			return (http::status::StatusCode::from_u16(sc).unwrap(), "")
				.into_response()
		},
	};

	handler(req).await
}

async fn go() -> Result<()> {
	let mut conn = rusqlite::Connection::open("./shelves.db")?;
	migrate(&mut conn)?;

	let (tx, _, _) =
		atelier::rusqlite_thread_pool::spawn_threadpool_supervised(
			4,
			"./shelves.db",
			|conn| init(conn),
		)?;

	let addr = "127.0.0.1:8333".parse::<SocketAddr>()?;
	let listener = TcpListener::bind(addr).await?;

	let router = Arc::new(make_router());
	let s = move |req: Request| {
		let tx = tx.clone();
		let router = router.clone();

		serve(tx, router.clone(), req)
	};

	axum::serve(listener, s.into_make_service()).await?;

	Ok(())
}

fn main() {
	let rt = tokio::runtime::Builder::new_multi_thread()
		.enable_all()
		.build()
		.unwrap();

	rt.block_on(go()).unwrap();
}