use crate::api::ApiHandler;
use crate::config::Config;
use anyhow::Result;
use hyper_util::rt::TokioIo;
use hyper_util::server::conn::auto::Builder as AutoBuilder;
use std::net::SocketAddr;
use std::sync::Arc;
use tokio::net::TcpListener;
use hyper::service::service_fn;
use tracing::{error, info};

pub struct Server {
    config: Config,
    api_handler: Arc<ApiHandler>,
}

impl Server {
    pub async fn new(config: Config) -> Result<Self> {
        let api_handler = Arc::new(ApiHandler::new(config.clone()).await?);

        Ok(Self {
            config,
            api_handler,
        })
    }

    pub async fn serve(&self, addr: SocketAddr) -> Result<()> {
        let listener = TcpListener::bind(addr).await?;

        loop {
            let (stream, peer_addr) = match listener.accept().await {
                Ok(conn) => conn,
                Err(e) => {
                    error!("Failed to accept connection: {}", e);
                    continue;
                }
            };

            let io = TokioIo::new(stream);
            let handler = self.api_handler.clone();

            tokio::spawn(async move {
                let service = service_fn(move |req| {
                    let handler = handler.clone();
                    async move {
                        handler.handle_request(req).await
                            .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, format!("{}", e)))
                    }
                });

                let mut builder = AutoBuilder::new(
                    hyper_util::rt::TokioExecutor::new()
                );
                // Use HTTP/1.1 only for now
                builder = builder.http1_only();
                
                if let Err(e) = builder
                    .serve_connection(io, service)
                    .await
                {
                    error!("Error serving connection from {}: {}", peer_addr, e);
                }
            });
        }
    }
}