// This file is part of Locus <https://github.com/gemrest/locus>.
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2022 Fuwn <contact@fuwn.me>
// SPDX-License-Identifier: GPL-3.0-only

use std::sync::{LazyLock, Mutex};

use tokio::time::Instant;
use windmark::context::HookContext;

use crate::route::{CACHE_RATE, ROUTES};

fn cache(context: &windmark::context::HookContext, response: &str) {
  static LAST_CACHED: LazyLock<Mutex<Instant>> =
    LazyLock::new(|| Mutex::new(Instant::now()));

  if (*LAST_CACHED.lock().unwrap()).elapsed()
    >= std::time::Duration::from_secs(CACHE_RATE)
    || (*ROUTES.lock().unwrap())
      .get(context.url.path())
      .is_some_and(|r| r.text_cache.is_empty())
  {
    (*LAST_CACHED.lock().unwrap()) = Instant::now();

    if let Some(route) = (*ROUTES.lock().unwrap()).get_mut(context.url.path()) {
      route.text_cache = response.to_string();
      info!("cache set for {}", context.url.path());
    } else {
      warn!(
        "cache could not be set for {} as it is not being tracked",
        context.url.path()
      );
    }

    trace!("recache for {}", {
      let path = context.url.path();

      if path.is_empty() {
        "/"
      } else {
        path
      }
    });
  }
}

pub fn module(router: &mut windmark::router::Router) {
  router.set_pre_route_callback(move |context: HookContext| {
    info!(
      "accepted connection from {} to {}",
      context.peer_address.unwrap().ip(),
      context.url.to_string(),
    );

    super::ticker::module(&context);
  });
  router.set_post_route_callback({
    |context: HookContext, response: &mut windmark::response::Response| {
      info!(
        "closed connection from {} to {}",
        context.peer_address.unwrap().ip(),
        context.url.to_string(),
      );

      cache(&context, &response.content);

      if let Some(language) =
        windmark::utilities::queries_from_url(&context.url).get("translate")
      {
        if super::translate::module(&context, response, language).is_err() {
          response.content = format!(
            "An error occurred during the translation process. Your language \
             might not be supported.\n\n=> {} View Original\n\n{}",
            context
              .url
              .to_string()
              .replace(&format!("translate={language}"), ""),
            response.content
          );
        }
      }
    }
  });
}