use std::sync::Arc;
use std::time::Duration;
use tokio::net::TcpStream;
use tokio::sync::RwLock;
use tracing::debug;

use super::upstream::UpstreamPool;

/// Health check method
#[derive(Debug, Clone)]
pub enum CheckMethod {
    TcpConnect,
    HttpGet(String),
}

/// Health checker for upstream servers
pub struct HealthChecker {
    interval: Duration,
    _timeout: Duration,
    _threshold: u32,
    _method: CheckMethod,
}

impl HealthChecker {
    pub fn new(interval: Duration, timeout: Duration, threshold: u32, method: CheckMethod) -> Self {
        Self {
            interval,
            _timeout: timeout,
            _threshold: threshold,
            _method: method,
        }
    }

    /// Start the health check loop
    pub fn start(self, _pool: Arc<RwLock<UpstreamPool>>) {
        tokio::spawn(async move {
            let mut interval = tokio::time::interval(self.interval);
            loop {
                interval.tick().await;
                // Health checks would be performed here
                // For now, this is a placeholder
                debug!("Health check tick");
            }
        });
    }

    async fn _tcp_check(&self, addr: &str, timeout: Duration) -> bool {
        match tokio::time::timeout(timeout, TcpStream::connect(addr)).await {
            Ok(Ok(_)) => true,
            Ok(Err(e)) => {
                debug!("TCP check failed for {}: {}", addr, e);
                false
            }
            Err(_) => {
                debug!("TCP check timeout for {}", addr);
                false
            }
        }
    }
}