use axum::{extract::State, response::IntoResponse, routing::get, Router};
use axum_extra::extract::cookie::{Cookie, CookieJar};
use clap::Parser;
use morethantext::MoreThanText;
use tokio::{spawn, sync::mpsc::channel};

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,
    /// cluster host
    #[arg(short, long, num_args(0..))]
    node: Vec<String>,
}

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

async fn create_app(state: MoreThanText) -> Router {
    Router::new().route("/", get(mtt_conn)).with_state(state)
}

async fn mtt_conn(jar: CookieJar, state: State<MoreThanText>) -> impl IntoResponse {
    let sid = match jar.get(SESSION_KEY) {
        Some(cookie) => Some(cookie.value().to_string()),
        None => None,
    };
    let sess_info = sid.clone();
    let (tx, mut rx) = channel(5);
    spawn(async move {
        tx.send(state.clone().request(sess_info)).await.unwrap();
    });
    let reply = rx.recv().await.unwrap();
    let cookie = Cookie::build((SESSION_KEY, reply.get_session().to_string()));
    let cookies = jar.add(cookie);
    (cookies, reply.get_content())
}

#[cfg(test)]
mod servers {
    use super::*;
    use axum::{
        body::Body,
        http::{Request, StatusCode},
    };
    use tower::ServiceExt;

    #[tokio::test]
    async fn get_home_page() {
        let app = create_app(MoreThanText::new()).await;
        let response = app
            .oneshot(Request::builder().uri("/").body(Body::empty()).unwrap())
            .await
            .unwrap();
        assert_eq!(response.status(), StatusCode::OK);
        let sessid = format!("{:?}", response.headers().get("set-cookie").unwrap());
        assert!(sessid.contains(SESSION_KEY), "did not set session id");
    }

    #[tokio::test]
    async fn session_ids_are_unique() {
        let app = create_app(MoreThanText::new()).await;
        let mut holder: Vec<String> = Vec::new();
        for _ in 0..5 {
            let response = app
                .clone()
                .oneshot(Request::builder().uri("/").body(Body::empty()).unwrap())
                .await
                .unwrap();
            let sessid = format!("{:?}", response.headers().get("set-cookie").unwrap());
            assert!(
                !holder.contains(&sessid),
                "found duplicate entry: {:?}",
                holder
            );
            holder.push(sessid);
        }
    }

    #[tokio::test]
    async fn receive_file_not_found() {
        let app = create_app(MoreThanText::new()).await;
        let response = app
            .oneshot(
                Request::builder()
                    .uri("/isomething")
                    .body(Body::empty())
                    .unwrap(),
            )
            .await
            .unwrap();
        assert_eq!(response.status(), StatusCode::NOT_FOUND);
    }
}