use std::str;

use crate::relay_loop::run_relay_loop;
use crate::settings::Settings;
use emgauwa_lib::db::errors::DatabaseError;
use emgauwa_lib::db::{DbController, DbRelay};
use emgauwa_lib::types::ControllerUid;
use emgauwa_lib::{db, models};
use futures::channel::mpsc;
use futures::{future, pin_mut, SinkExt, StreamExt};
use sqlx::pool::PoolConnection;
use sqlx::Sqlite;
use tokio::io::AsyncReadExt;
use tokio_tungstenite::tungstenite::Error;
use tokio_tungstenite::{connect_async, tungstenite::protocol::Message};

mod driver;
mod relay_loop;
mod settings;

async fn create_this_controller(
	conn: &mut PoolConnection<Sqlite>,
	settings: &Settings,
) -> DbController {
	DbController::create(
		conn,
		&ControllerUid::default(),
		&settings.name,
		i64::try_from(settings.relays.len()).expect("Too many relays"),
		true,
	)
	.await
	.expect("Failed to create controller")
}

async fn create_this_relay(
	conn: &mut PoolConnection<Sqlite>,
	this_controller: &DbController,
	settings_relay: &settings::Relay,
) -> DbRelay {
	DbRelay::create(
		conn,
		&settings_relay.name,
		settings_relay.number.unwrap(),
		this_controller,
	)
	.await
	.expect("Failed to create relay")
}

#[tokio::main]
async fn main() {
	let settings = settings::init();

	let pool = db::init(&settings.database).await;

	let mut conn = pool.acquire().await.unwrap();

	let db_controller = DbController::get_all(&mut conn)
		.await
		.expect("Failed to get controller from database")
		.pop()
		.unwrap_or_else(|| {
			futures::executor::block_on(create_this_controller(&mut conn, &settings))
		});

	let db_relays: Vec<DbRelay> = settings
		.relays
		.iter()
		.map(|relay| {
			futures::executor::block_on(async {
				match DbRelay::get_by_controller_and_num(
					&mut conn,
					&db_controller,
					relay.number.unwrap(),
				)
				.await
				{
					Ok(relay) => relay,
					Err(err) => match err {
						DatabaseError::NotFound => {
							create_this_relay(&mut conn, &db_controller, relay).await
						}
						_ => panic!("Failed to get relay from database"),
					},
				}
			})
		})
		.collect();

	let db_controller = db_controller
		.update(&mut conn, &db_controller.name, db_relays.len() as i64, true)
		.await
		.unwrap();

	let relays = db_relays
		.into_iter()
		.map(|relay| models::Relay::from_db_relay(relay, &mut conn))
		.collect();

	let this = models::Controller {
		controller: db_controller,
		relays,
	};

	let this_json = serde_json::to_string(&this).unwrap();

	println!("{}", this_json);

	let url = format!(
		"ws://{}:{}/api/v1/ws/controllers",
		settings.core.host, settings.core.port
	);

	let (stdin_tx, stdin_rx) = mpsc::unbounded();
	tokio::spawn(read_stdin(stdin_tx));

	let (ws_stream, _) = connect_async(url).await.expect("Failed to connect");

	let (mut write, read) = ws_stream.split();

	write.send(Message::text(this_json)).await.unwrap();
	let ws_to_stdout = read.for_each(handle_message);
	let stdin_to_ws = stdin_rx.map(Ok).forward(write);

	tokio::spawn(run_relay_loop(settings));

	pin_mut!(stdin_to_ws, ws_to_stdout);
	future::select(stdin_to_ws, ws_to_stdout).await;
}

// Our helper method which will read data from stdin and send it along the
// sender provided.
async fn read_stdin(tx: mpsc::UnboundedSender<Message>) {
	let mut stdin = tokio::io::stdin();
	loop {
		let mut buf = vec![0; 1024];
		let n = match stdin.read(&mut buf).await {
			Err(_) | Ok(0) => break,
			Ok(n) => n,
		};
		buf.truncate(n);
		tx.unbounded_send(Message::text(str::from_utf8(&buf).unwrap()))
			.unwrap();
	}
}

pub async fn handle_message(message_result: Result<Message, Error>) {
	match message_result {
		Ok(message) => println!("{}", message.into_text().unwrap()),
		Err(err) => println!("Error: {}", err),
	}
}