oxirs-stream 0.2.4

//! Kafka producer implementation

use super::types::KafkaProducerConfig;
use super::event::KafkaEvent;
use crate::event::StreamEvent;
use anyhow::Result;
use std::sync::Arc;
use tokio::sync::RwLock;
use tracing::{debug, error, info};

/// Enhanced Kafka producer with enterprise features
pub struct KafkaProducer {
    config: KafkaProducerConfig,
    stats: Arc<RwLock<ProducerStats>>,
}

/// Producer statistics
#[derive(Debug, Default)]
pub struct ProducerStats {
    pub messages_sent: u64,
    pub messages_failed: u64,
    pub bytes_sent: u64,
    pub avg_latency_ms: f64,
    pub transactions_committed: u64,
    pub transactions_aborted: u64,
}

impl KafkaProducer {
    /// Create new Kafka producer
    pub fn new(config: KafkaProducerConfig) -> Result<Self> {
        info!("Creating Kafka producer with config: {:?}", config);
        
        Ok(Self {
            config,
            stats: Arc::new(RwLock::new(ProducerStats::default())),
        })
    }

    /// Send event to Kafka
    pub async fn send_event(&self, event: StreamEvent) -> Result<()> {
        let kafka_event = KafkaEvent::from(event);
        debug!("Sending Kafka event: {:?}", kafka_event);

        // Simulate sending to Kafka
        {
            let mut stats = self.stats.write().await;
            stats.messages_sent += 1;
            stats.bytes_sent += serde_json::to_string(&kafka_event)?.len() as u64;
        }

        info!("Successfully sent event to Kafka topic: {}", self.config.topic);
        Ok(())
    }

    /// Send batch of events
    pub async fn send_batch(&self, events: Vec<StreamEvent>) -> Result<Vec<Result<(), String>>> {
        let mut results = Vec::new();
        
        for event in events {
            match self.send_event(event).await {
                Ok(()) => results.push(Ok(())),
                Err(e) => results.push(Err(e.to_string())),
            }
        }
        
        Ok(results)
    }

    /// Get producer statistics
    pub async fn get_stats(&self) -> ProducerStats {
        self.stats.read().await.clone()
    }

    /// Flush pending messages
    pub async fn flush(&self) -> Result<()> {
        info!("Flushing Kafka producer");
        Ok(())
    }

    /// Begin transaction
    pub async fn begin_transaction(&self) -> Result<()> {
        if self.config.transaction_id.is_some() {
            info!("Beginning Kafka transaction");
        }
        Ok(())
    }

    /// Commit transaction
    pub async fn commit_transaction(&self) -> Result<()> {
        if self.config.transaction_id.is_some() {
            let mut stats = self.stats.write().await;
            stats.transactions_committed += 1;
            info!("Committed Kafka transaction");
        }
        Ok(())
    }

    /// Abort transaction
    pub async fn abort_transaction(&self) -> Result<()> {
        if self.config.transaction_id.is_some() {
            let mut stats = self.stats.write().await;
            stats.transactions_aborted += 1;
            info!("Aborted Kafka transaction");
        }
        Ok(())
    }
}

impl Clone for ProducerStats {
    fn clone(&self) -> Self {
        Self {
            messages_sent: self.messages_sent,
            messages_failed: self.messages_failed,
            bytes_sent: self.bytes_sent,
            avg_latency_ms: self.avg_latency_ms,
            transactions_committed: self.transactions_committed,
            transactions_aborted: self.transactions_aborted,
        }
    }
}