use emailks::{
    config::AppConfig,
    etcd::{EtcdConfig, ServiceRegistry},
    EmailksServer,
};
use tracing::info;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    tracing_subscriber::fmt()
        .with_env_filter(
            tracing_subscriber::EnvFilter::try_from_default_env()
                .unwrap_or_else(|_| "info".into()),
        )
        .init();

    dotenvy::dotenv().ok();

    let etcd_endpoints: Vec<String> = std::env::var("ETCD_ENDPOINTS")
        .unwrap_or_else(|_| "http://localhost:2379".to_string())
        .split(',')
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty())
        .collect();
    let etcd_prefix = std::env::var("ETCD_KEY_PREFIX")
        .unwrap_or_else(|_| "/appks/".to_string());

    let etcd = EtcdConfig::connect(etcd_endpoints, &etcd_prefix).await?;
    let listen_addr_str = etcd.get("EMAILKS_LISTEN_ADDR", "127.0.0.1:50051").await;

    let registry = ServiceRegistry::new(etcd.client(), &etcd_prefix);
    registry.register("emailks", &listen_addr_str).await?;

    let smtp_host = etcd.get("APP_SMTP_HOST", "").await;
    if smtp_host.is_empty() {
        return Err("APP_SMTP_HOST is required (set via etcd or env)".into());
    }
    let smtp_port: u16 = etcd.get_parsed("APP_SMTP_PORT", 587u16).await;
    let smtp_from_email = etcd.get("APP_SMTP_FROM_EMAIL", "").await;
    let smtp_from_name = etcd.get("APP_SMTP_FROM_NAME", "EmailKS").await;
    let smtp_reply_to = etcd.get("APP_SMTP_REPLY_TO", "").await;
    let smtp_tls = etcd.get("APP_SMTP_TLS", "starttls").await;
    let smtp_timeout_secs: u64 = etcd.get_parsed("APP_SMTP_TIMEOUT_SECS", 30u64).await;
    let smtp_allow_request_from: bool = etcd.get_parsed("APP_SMTP_ALLOW_REQUEST_FROM", false).await;
    let smtp_username = etcd.get("APP_SMTP_USERNAME", "").await;
    let smtp_password = etcd.get("APP_SMTP_PASSWORD", "").await;
    let smtp_helo_name = etcd.get("APP_SMTP_HELO_NAME", "").await;

    let queue_capacity: Option<usize> = {
        let s = etcd.get("APP_SMTP_QUEUE_CAPACITY", "").await;
        if s.is_empty() { None } else { s.parse().ok() }
    };

    let config = AppConfig::from_etcd(
        smtp_host, smtp_port, smtp_username, smtp_password,
        smtp_from_email, smtp_from_name, smtp_reply_to,
        smtp_tls, smtp_timeout_secs, smtp_helo_name, smtp_allow_request_from,
        queue_capacity,
        &listen_addr_str,
    )?;

    info!(host = %config.smtp.host, port = config.smtp.port, "smtp config loaded (etcd priority)");

    let server = EmailksServer::builder().config(config).build().await?;
    server.serve().await?;

    Ok(())
}