use std::sync::OnceLock;

use actix_http::HttpService;
use actix_server::Server;
use actix_service::map_config;
use actix_web::{dev::AppConfig, get, App, Responder};

static MEDIUM: OnceLock<String> = OnceLock::new();
static LARGE: OnceLock<String> = OnceLock::new();

#[get("/")]
async fn index() -> impl Responder {
    "Hello, world. From Actix Web!"
}

#[get("/large")]
async fn large() -> &'static str {
    LARGE.get_or_init(|| "123456890".repeat(1024 * 100))
}

#[get("/medium")]
async fn medium() -> &'static str {
    MEDIUM.get_or_init(|| "123456890".repeat(1024 * 5))
}

#[tokio::main(flavor = "current_thread")]
async fn main() -> std::io::Result<()> {
    Server::build()
        .bind("hello-world", "127.0.0.1:8080", || {
            // construct actix-web app
            let app = App::new().service(index).service(large).service(medium);

            HttpService::build()
                // pass the app to service builder
                // map_config is used to map App's configuration to ServiceBuilder
                // h1 will configure server to only use HTTP/1.1
                .h1(map_config(app, |_| AppConfig::default()))
                .tcp()
        })?
        .run()
        .await
}