use actix_web::{web, App, HttpRequest, HttpServer, Responder};
use listenfd::ListenFd;

async fn greet(req: HttpRequest) -> impl Responder {
    let name = req.match_info().get("name").unwrap_or("World");
    format!("Hello {}!", &name)
}

async fn index(_: HttpRequest) -> impl Responder {
    "Hello, this is an API. If you're looking for the web app, try port 443.".to_string()
}

#[actix_rt::main]
async fn main() -> std::io::Result<()> {
    let mut listenfd = ListenFd::from_env();
    let mut server = HttpServer::new(|| {
        App::new()
            .route("/", web::get().to(index))
            .route("/{name}", web::get().to(greet))
    });

    server = if let Some(l) = listenfd.take_tcp_listener(0).unwrap() {
        server.listen(l)?
    } else {
        server.bind("127.0.0.1:8000")?
    };
    server.run().await
}