use std::{sync::Arc, time::Duration};

use axum::{extract::State, http::StatusCode, response::Html, routing::{get, post}, serve, Form, Router};
use common::{Name, Request};
use postcard::to_allocvec;
use tokio::{fs, io::{AsyncReadExt, AsyncWriteExt}, net::TcpStream, sync::{RwLock, Semaphore}, time::{self, sleep, Instant}};
use anyhow::{Ok, Result};
use tracing::{error, info, trace, Level};
use tracing_subscriber::{filter, layer::{Filter, SubscriberExt}, util::SubscriberInitExt, Layer};

const FISH: &'static str = "169.254.2.1:1234";

#[derive(Clone)]
struct AppState {
    fish: Arc<Semaphore>,
    last_badge: Arc<RwLock<(u64,Instant)>>,
}

#[tokio::main]
async fn main() -> Result<()>{
    let log = fs::OpenOptions::new().append(true).create(true).open("john.log").await?;

    let (non_blocking, _guard) = tracing_appender::non_blocking(log.into_std().await);

    let filter = filter::Targets::new()
        .with_target("server", Level::INFO);

    let stdout = tracing_subscriber::fmt::layer()
        .compact()
        .with_file(true)
        .with_target(true);

    let log = tracing_subscriber::fmt::layer()
        .compact()
        .with_file(false)
        .with_target(true)
        .with_writer(non_blocking)
        .with_filter(filter);

    let reg = tracing_subscriber::registry()
        .with(stdout)
        .with(log);

    reg.try_init()?;

    let fish = Arc::new(Semaphore::new(1));
    let last_badge = Arc::new(RwLock::new((0u64,Instant::now())));

    info!("starting");


    let app: Router = Router::new()
        .route("/", get(root))
        .route("/phil", get(phil))
        .route("/recent", get(recent_badge))
        .route("/setLast", post(set_last))
        //.route("/map", post(set_badge))
        .with_state(AppState {
            fish: fish.clone(),
            last_badge: last_badge.clone()
        });

    let listener = tokio::net::TcpListener::bind("0.0.0.0:8080").await.unwrap();

    tokio::spawn(async {serve(listener, app).await.unwrap()});



    let fish_ = fish.clone();
    tokio::spawn(async move {
        loop {
            match get_recent_badge(fish_.clone()).await {
                Result::Ok(badge) => {
                    *last_badge.write().await = (badge, Instant::now());
                },
                Err(e) => {
                    trace!("badge read fail: {e}");
                }
            }
            sleep(Duration::from_secs(1)).await;
        }
    });

    {
        let _permit = fish.acquire().await?;
        let mut conn = TcpStream::connect(FISH).await?;

        let req = Request::RecentBadge;
        conn.write_all(&to_allocvec(&req)?).await?;
        conn.flush().await?;

        let badge = conn.read_u64().await?;
        info!("read: {badge}");

        if badge != 0 {
            let req = Request::SetBadge(common::Name::Evan, badge);
            conn.write_all(&to_allocvec(&req)?).await?;
            conn.flush().await?;
        }

        let req = Request::SetVolume(30);
        conn.write_all(&to_allocvec(&req)?).await?;
    }

    loop {
        sleep(Duration::from_secs(2)).await;
    }
}

async fn get_recent_badge(fish: Arc<Semaphore>) -> Result<u64> {
    let _permit = fish.acquire().await?;
    let mut conn = TcpStream::connect(FISH).await?;

    let req = Request::RecentBadge;
    conn.write_all(&to_allocvec(&req)?).await?;
    conn.flush().await?;

    let badge = conn.read_u64().await?;

    if badge != 0 {
        info!("new badge: {badge:#0x}");
        Ok(badge)
    } else {
        Err(anyhow::anyhow!("no badge present"))
    }
}

async fn root(state: State<AppState>) -> Html<String> {
    let (last_badge, time) = *state.last_badge.read().await;
    let time = time.elapsed();

    let mut page = format!(r#"
        <p>
        most recent badge {last_badge:#0x}<br>
        {time:?} ago
        </p>
        <h1>set last badge</h1>
    "#);

    for name in [
        "Tess",
        "Amaia",
        "Prueky",
        "David",
        "Nathaniel",
        "Thia",
        "Michael",
        "Zoey",
    ] {
        page.push_str(&format!(r#"
            <form action="setLast" method="post" id="myForm">
                <button style="font-size:40px;" type="submit" name="name", value="{name}">{name}</button>
            </form>
        "#));
    }
    Html::from(page)
}

#[derive(serde::Deserialize)]
struct NameForm {
    name: String,
}

async fn set_last(
    state: State<AppState>,
    Form(input): Form<NameForm>) -> Html<String> {

    let name_e = match input.name.as_str() {
        "Tess" => Name::Tess,
        "Amaia" => Name::Amaia,
        "Prueky" => Name::Prueky,
        "David" => Name::David,
        "Nathaniel" => Name::Nathaniel,
        "Thia" => Name::Thia,
        "Michael" => Name::Michael,
        "Zoey" => Name::Zoey,
        _ => Name::Unknown,
        
    };

    let (last_badge, _) = *state.last_badge.read().await;
    info!("setting {} ({name_e:?}) to {last_badge:#0x}", input.name);
    let _fish = state.fish.acquire().await.unwrap();
    let mut conn = TcpStream::connect(FISH).await.unwrap();

    if last_badge == 0 {
        return Html::from("<h1>failed, no badge scanned</h1>".to_string());
    }

    let req = Request::SetBadge(name_e, last_badge);
    conn.write_all(&to_allocvec(&req).unwrap()).await.unwrap();
    conn.flush().await.unwrap();


    Html::from(format!("<p>{last_badge:#0x} is now {}</p></br><a href=\"/\">back</a>", input.name))
}

async fn recent_badge(state: State<AppState>) -> String {
    let (last_badge, time) = *state.last_badge.read().await;
    format!("id: {last_badge:#0x}, scanned {:?} ago", time.elapsed())
}

async fn phil(state: State<AppState>) -> String {
    let _fish = state.fish.acquire().await.unwrap();
    let (last_badge, time) = *state.last_badge.read().await;
    info!("id: {last_badge:#0x}, scanned {:?} ago", time.elapsed());
    let mut conn = TcpStream::connect(FISH).await.unwrap();

    if last_badge != 0 {
        let req = Request::SetBadge(common::Name::Phil, last_badge);
        conn.write_all(&to_allocvec(&req).unwrap()).await.unwrap();
        conn.flush().await.unwrap();
    }


    String::from(format!("{last_badge:#0x} is now phil"))

}