use axum::{response::IntoResponse, routing::get, Router};
use axum_extra::extract::cookie::{Cookie, CookieJar};
use clap::Parser;
use rand::distributions::{Alphanumeric, DistString};

const LOCALHOST: &str = "127.0.0.1";
const SESSION_KEY: &str = "sessionid";

#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
    /// Post used
    #[arg(short, long, default_value_t = 3000)]
    port: u16,
    /// IP used
    #[arg(short, long, default_value_t = LOCALHOST.to_string())]
    address: String,
}

#[cfg(test)]
mod http_session {
    #[tokio::test]
    async fn my_test() {
        assert!(true);
    }
}

#[tokio::main]
async fn main() {
    let args = Args::parse();
    let addr = format!("{}:{}", args.address, args.port);
    let app = Router::new().route("/", get(handler));
    let listener = tokio::net::TcpListener::bind(&addr).await.unwrap();
    axum::serve(listener, app.into_make_service())
        .await
        .unwrap();
}

async fn handler(jar: CookieJar) -> impl IntoResponse {
    let cookies: CookieJar;
    let id: String;
    match jar.get(SESSION_KEY) {
        Some(session) => {
            id = session.to_string();
            cookies = jar;
        }
        None => {
            id = Alphanumeric.sample_string(&mut rand::thread_rng(), 16);
            let cookie = Cookie::build((SESSION_KEY, id.clone())).domain("example.com");
            cookies = jar.add(cookie);
        }
    }
    (cookies, format!("id is {}", id))
}