/// Module Event Bus NATS pour communication asynchrone

use std::sync::Arc;
use tokio::sync::RwLock;
// Note: Use tracing::info! macro directly instead of importing
use serde::{Serialize, Deserialize};
use uuid::Uuid;

use crate::error::AppError;
use crate::core::StreamEvent;

/// Configuration NATS (simulation)
#[derive(Debug, Clone)]
pub struct NatsConfig {
    pub servers: Vec<String>,
    pub cluster_name: String,
    pub client_id: String,
}

/// Event Bus principal
#[derive(Debug)]
pub struct EventBus {
    config: NatsConfig,
    metrics: Arc<RwLock<EventBusMetrics>>,
}

/// Métriques de l'Event Bus
#[derive(Debug, Clone, Default)]
pub struct EventBusMetrics {
    pub events_published: u64,
    pub events_received: u64,
    pub events_failed: u64,
    pub throughput_per_second: f64,
}

impl Default for NatsConfig {
    fn default() -> Self {
        Self {
            servers: vec!["nats://localhost:4222".to_string()],
            cluster_name: "veza-cluster".to_string(),
            client_id: format!("stream-server-{}", Uuid::new_v4()),
        }
    }
}

impl EventBus {
    pub async fn new(config: NatsConfig) -> Result<Self, AppError> {
        tracing::info!("🚀 Initialisation Event Bus NATS");
        
        Ok(Self {
            config,
            metrics: Arc::new(RwLock::new(EventBusMetrics::default())),
        })
    }
    
    pub async fn start(&self) -> Result<(), AppError> {
        tracing::info!("🔄 Démarrage Event Bus NATS");
        
        // Simulation de connexion NATS
        tokio::time::sleep(std::time::Duration::from_millis(100)).await;
        
        tracing::info!("✅ Event Bus démarré avec succès");
        Ok(())
    }
    
    pub async fn publish_event(&self, event: StreamEvent) -> Result<(), AppError> {
        tracing::debug!("📤 Publication événement: {:?}", event);
        
        // Simulation de publication
        tokio::time::sleep(std::time::Duration::from_millis(5)).await;
        
        let mut metrics = self.metrics.write().await;
        metrics.events_published += 1;
        
        Ok(())
    }
    
    pub async fn get_metrics(&self) -> EventBusMetrics {
        self.metrics.read().await.clone()
    }
}

/// Événement business pour communication inter-services
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BusinessEvent {
    pub id: Uuid,
    pub event_type: String,
    pub timestamp: std::time::SystemTime,
    pub source: String,
}
