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use std::{net::SocketAddr, path::PathBuf, result::Result as StdResult};

use axum::{response::Html, routing::get, Router};
use btconsole_client::App;
use btlib::{bterr, Result};
use bytes::{Bytes, BytesMut};
use futures::FutureExt;
use regex::Regex;
use serde::{Deserialize, Serialize};
use tokio::{sync::oneshot, task::JoinHandle};
use tower::Service;
use tower_http::services::ServeDir;
use yew::ServerRenderer;

#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
pub struct BtConsoleConfig {
    addr: SocketAddr,
    #[serde(rename = "distpath")]
    dist_path: PathBuf,
}

impl BtConsoleConfig {
    pub fn new(addr: SocketAddr, asset_path: PathBuf) -> Self {
        Self {
            addr,
            dist_path: asset_path,
        }
    }
}

impl Default for BtConsoleConfig {
    fn default() -> Self {
        Self {
            addr: SocketAddr::from(([127, 0, 0, 1], 3000)),
            dist_path: "../../target/dist".into(),
        }
    }
}

pub struct BtConsole {
    handle: JoinHandle<StdResult<(), hyper::Error>>,
    stop: Option<oneshot::Sender<()>>,
}

impl BtConsole {
    fn new(handle: JoinHandle<StdResult<(), hyper::Error>>, stop: oneshot::Sender<()>) -> Self {
        Self {
            handle,
            stop: Some(stop),
        }
    }

    pub async fn start(config: BtConsoleConfig) -> Result<Self> {
        let rendered: Bytes = {
            let index_path = config.dist_path.join("index.html");
            let (index, rendered) = tokio::join!(
                tokio::fs::read_to_string(&index_path),
                ServerRenderer::<App>::new().render(),
            );
            let index = index?;
            let regex = Regex::new(r"</?body>")?;
            let fields = regex.split(&index);
            let mut bytes = BytesMut::with_capacity(index.len() + rendered.len() + 13);
            for (index, entry) in fields.enumerate() {
                if 1 == index {
                    bytes.extend_from_slice(b"<body>");
                    bytes.extend_from_slice(rendered.as_bytes());
                    bytes.extend_from_slice(b"</body>");
                } else {
                    bytes.extend_from_slice(entry.as_bytes());
                }
            }
            bytes.into()
        };
        let mut serve_dir = ServeDir::new(config.dist_path).append_index_html_on_directories(false);

        let app = Router::new()
            .route("/", get(|| async move { Html(rendered) }))
            .route("/*path", get(move |req| serve_dir.call(req)));

        log::info!("listening at http://{}", config.addr);

        let (tx, rx) = oneshot::channel::<()>();
        let server = axum::Server::bind(&config.addr)
            .serve(app.into_make_service())
            .with_graceful_shutdown(rx.map(|result| result.unwrap()));
        let handle = tokio::spawn(server);

        Ok(Self::new(handle, tx))
    }

    pub fn signal_shutdown(&mut self) -> Result<()> {
        if let Some(stop) = self.stop.take() {
            stop.send(())
                .map_err(|_| bterr!("failed to send stop signal to server"))?;
        }
        Ok(())
    }

    pub fn take_shutdown_signal(&mut self) -> Option<oneshot::Sender<()>> {
        self.stop.take()
    }

    pub async fn has_shutdown(self) -> Result<()> {
        self.handle.await?.map_err(|err| err.into())
    }
}