use crate::models::ServerEvent;
use once_cell::sync::Lazy;
use tokio::sync::broadcast;

/// SSE 事件管理器
pub struct EventManager {
    tx: broadcast::Sender<String>,
}

impl EventManager {
    pub fn new() -> Self {
        let (tx, _) = broadcast::channel(64);
        Self { tx }
    }

    /// 广播事件给所有 SSE 客户端
    pub fn broadcast(&self, event: &ServerEvent) {
        if let Ok(json) = serde_json::to_string(event) {
            let _ = self.tx.send(json);
        }
    }

    /// 获取广播接收器
    pub fn subscribe(&self) -> broadcast::Receiver<String> {
        self.tx.subscribe()
    }
}

pub static EVENTS: Lazy<EventManager> = Lazy::new(EventManager::new);