convd 2.6.12

use crate::server::app_state::AppState;
use axum::Router;
use color_eyre::Result;
use convertor::config::ConvertorConfig;
use std::net::{SocketAddr, SocketAddrV4};
use tokio::net::{TcpListener, TcpSocket};
use tokio::signal;
use tokio_util::sync::CancellationToken;
use tracing::{info, warn};

pub mod app_state;
pub mod query;
pub mod response;
pub mod router;
pub mod service;

pub async fn start_server(listen_addr: SocketAddrV4, config: ConvertorConfig) -> Result<()> {
    let (redis_client, connection_manager) = match config.redis.as_ref() {
        Some(redis_config) => {
            info!("+──────────────────────────────────────────────+");
            info!("│             初始化 Redis 连接...             │");
            info!("+──────────────────────────────────────────────+");
            let redis_client = redis_config.build_redis_client()?;
            tracing::debug!("等待 connection_manager 就绪...");
            let connection_manager = redis::aio::ConnectionManager::new_with_config(
                redis_client.clone(),
                redis::aio::ConnectionManagerConfig::new()
                    .set_number_of_retries(5)
                    .set_max_delay(2000),
            )
            .await?;
            // let mut config_receiver = start_sub_config(redis_client.clone(), config);
            // let mut current_config = config_receiver.borrow().clone();
            info!("Redis 连接就绪");
            (Some(redis_client), Some(connection_manager))
        }
        None => (None, None),
    };
    let current_config = config;

    let cancel_token = CancellationToken::new();

    info!("+──────────────────────────────────────────────+");
    info!("│                 启动服务...                  │");
    info!("+──────────────────────────────────────────────+");
    // loop {
    // 1) 启一个子 token 控制“本轮” server
    let stop_this = cancel_token.child_token();

    // 2) 构建 state / router
    let state = AppState::new(current_config, redis_client.clone(), connection_manager.clone());
    let app: Router = router::router(state);

    // 3) 绑定端口（Tokio 自带 TcpSocket，可设置 reuseaddr；不引新库）
    let listener = bind_once(listen_addr)?;

    // 4) 跑 server，直到被 cancel
    let serve_handle = tokio::spawn({
        let stop_this = stop_this.clone();
        async move {
            warn!("使用 Ctrl+C 或 SIGTERM 关闭服务, 建议使用 nginx 等网关进行反向代理, 以开启 HTTPS 支持");
            info!("服务启动, 监听于: {listen_addr}");
            axum::serve(listener, app.into_make_service_with_connect_info::<SocketAddr>())
                .with_graceful_shutdown(async move { stop_this.cancelled().await })
                .await
        }
    });

    // 5) 等待：要么全局退出，要么收到“去抖后的配置更新”
    tokio::select! {
            _ = shutdown_signal() => {
                // 收到 Ctrl+C 或 SIGTERM 信号，准备退出
                info!("收到退出信号，准备关闭服务…");
                stop_this.cancel();
                let _ = serve_handle.await;
                // break;
            }
            _ = cancel_token.cancelled() => {
                // 全局退出：关本轮 server 并退出
                stop_this.cancel();
                let _ = serve_handle.await;
                // break;
            }
            // Ok(config) = config_receiver.recv_debounced_distinct(tokio::time::Duration::from_secs(1), |_| true) => {
            //     info!("收到配置更新通知，准备重启服务…");
            //     info!("停止旧的服务…");
            //     stop_this.cancel();
            //     let _ = serve_handle.await;
            //     info!("更新配置…");
            //     current_config = config.clone();
            //     continue;
            // }
        // }
    }
    info!("服务关闭");
    Ok(())
}

fn bind_once(addr: SocketAddrV4) -> Result<TcpListener> {
    let sock = TcpSocket::new_v4()?;
    sock.set_reuseaddr(true)?;
    // #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
    // sock.set_reuseport(true)?; // 可选：看需要
    sock.bind(SocketAddr::V4(addr))?;
    Ok(sock.listen(1024)?)
}

// 启动 ConvertorConfig 的更新订阅
// fn start_sub_config(client: redis::Client, config: ConvertorConfig) -> watch::Receiver<ConvertorConfig> {
//     use color_eyre::eyre::WrapErr;
//     use convertor::common::redis::REDIS_CONVERTOR_CONFIG_PUBLISH_CHANNEL;
//     use tokio_stream::StreamExt;
//
//     let (tx, rx) = watch::channel(config);
//     tokio::spawn(async move {
//         info!("启动 Redis subscribe");
//         let connection = client.get_multiplexed_async_connection().await?;
//         let mut sub = client.get_async_pubsub().await?;
//         sub.subscribe(REDIS_CONVERTOR_CONFIG_PUBLISH_CHANNEL).await?;
//         let mut stream = sub.into_on_message();
//         while let Some(msg) = stream.next().await {
//             info!("Redis sub 接收到: {msg:?}");
//             if msg.get_channel_name() == REDIS_CONVERTOR_CONFIG_PUBLISH_CHANNEL {
//                 if let Err(e) = ConvertorConfig::from_redis(connection.clone())
//                     .await
//                     .and_then(|config| tx.send(config).wrap_err("无法发送更新配置"))
//                 {
//                     error!("{e:?}");
//                 }
//             }
//         }
//         Ok::<(), color_eyre::Report>(())
//     });
//     rx
// }

async fn shutdown_signal() {
    let ctrl_c = async {
        signal::ctrl_c().await.expect("failed to install Ctrl+C handler");
    };

    #[cfg(unix)]
    let terminate = async {
        signal::unix::signal(signal::unix::SignalKind::terminate())
            .expect("failed to install signal handler")
            .recv()
            .await;
    };

    #[cfg(not(unix))]
    let terminate = std::future::pending::<()>();

    tokio::select! {
        _ = ctrl_c => {},
        _ = terminate => {},
    }
}