// Copyright (C) 2023-2099 The crate authors.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// 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 Affero General Public License
// for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

#![feature(let_chains)]
#![feature(never_type)]

mod bot;
mod config;
mod error;
mod hook;
mod web;

use crate::bot::XmppClient;
use crate::config::Config;
use crate::error::Error;
use crate::hook::Hook;
use crate::web::hooks;

use std::path::PathBuf;
use std::sync::{Arc, Mutex};

use clap::{command, value_parser, Arg};
use hyper::{server::conn::http1, service::service_fn};
use hyper_util::rt::tokio::{TokioIo, TokioTimer};
use tokio::{net::TcpListener, sync::mpsc};

#[tokio::main]
async fn main() -> Result<!, Error> {
	pretty_env_logger::init();

	let matches = command!()
		.arg(
			Arg::new("config")
				.short('c')
				.long("config")
				.required(false)
				.value_parser(value_parser!(PathBuf)),
		)
		.get_matches();

	let config = Config::from_arg(matches.get_one::<PathBuf>("config"))?;

	let (value_tx, mut value_rx) = mpsc::unbounded_channel::<Hook>();

	let mut client = XmppClient::new(
		config.jid,
		config.password.as_str(),
		config.rooms,
		config.nickname,
	);

	let tcp_bind = TcpListener::bind(config.addr).await?;
	let secret: &'static String =
		unsafe { core::mem::transmute::<&String, &'static String>(&config.secret) };
	let value_tx = Arc::new(Mutex::new(value_tx));

	loop {
		let value_tx = value_tx.clone();

		tokio::select! {
			_ = client.next() => (),
			accept = tcp_bind.accept() => {
				if let Ok((tcp, _)) = accept {
					let io = TokioIo::new(tcp);
					tokio::task::spawn(async move {
						if let Err(err) = http1::Builder::new()
							.timer(TokioTimer::new())
							.serve_connection(io, service_fn(|request| {
								let value_tx = value_tx.clone();
								async move {
									hooks(request, secret, value_tx).await
								}
							}))
							.await
						{
							println!("Error serving connection: {:?}", err);
						}
					});
				}
			}
			wh = value_rx.recv() => {
				if let Some(Hook::Gitlab(hook)) = wh {
					client.hook(hook).await
				}
			}
		}
	}
}