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#![feature(lazy_cell)]

use dotenv::var;
use log::LevelFilter;
use std::collections::BTreeMap;
use std::fs::File;
use std::sync::Arc;
use lfm_embed::{STATE, ResponseCtx};
use lfm_embed::font::FontQuery;
use warp::Filter;

#[derive(serde::Deserialize, Debug)]
#[serde(rename = "kebab-case")]
struct UserQuery {
  #[serde(default)]
  theme: Option<Arc<str>>,
  #[serde(flatten)]
  #[serde(default)]
  font: Option<FontQuery>,
  #[serde(flatten)]
  rest: BTreeMap<String, String>
}

#[tokio::main]
async fn main() {
  env_logger::Builder::new()
    .filter_level(LevelFilter::Warn)
    .parse_filters(&var("LFME_LOG_LEVEL").unwrap_or_default())
    .target(
      var("LFME_LOG_FILE").ok()
        .map(
          |f| env_logger::Target::Pipe(
            Box::new(File::options()
              .append(true)
              .open(f)
              .expect("couldn't open LFME_LOG_FILE")))
        )
        .unwrap_or(env_logger::Target::Stderr)
    ).init();

  std::sync::LazyLock::force(&STATE);

  let user = warp::path!("user" / String)
    .and(warp::query::<UserQuery>())
    .then(|s, q: UserQuery| async move {
      log::debug!(target: "lfm::server::user", "Handling request for user `{s}` with {q:?}");
      let (ctx, dur) = STATE.get_userinfo(&s).await;
      let ResponseCtx(data, status) = ResponseCtx::create(ctx, q.font, q.rest).await;

      let theme = q.theme.filter(|a| STATE.handlebars().has_template(a)).unwrap_or_else(|| STATE.default_theme());
      log::debug!(target: "lfm::server::user", "Using theme {theme}");
      warp::reply::with_header(
        warp::reply::with_header(
          warp::reply::with_status(
            warp::reply::html(
              STATE.handlebars().render(&theme, &data).unwrap()
            ), status
          ), "Refresh", dur.as_secs()
        ), "X-Selected-Theme", theme.as_ref()
      )
    });

  warp::serve(user)
    .bind(([127,0,0,1], STATE.port())).await;
}