use clap::Parser;
use lanparty_gateway::GatewayArgs;
#[cfg(target_os = "linux")]
use lanparty_gateway::{PacketSocket, connect_gateway};

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let args = GatewayArgs::parse();
    run(args).await
}

#[cfg(target_os = "linux")]
async fn run(args: GatewayArgs) -> anyhow::Result<()> {
    let config = args.into_config()?;
    println!(
        "lanparty-gateway opening interface {} and connecting to relay {} room {}",
        config.interface(),
        config.relay_addr(),
        config.room()
    );

    let socket = PacketSocket::open(config.interface())?;
    println!(
        "lanparty-gateway opened AF_PACKET socket on {} (ifindex {})",
        socket.interface(),
        socket.interface_index()
    );

    let gateway = connect_gateway(config).await?;
    println!(
        "lanparty-gateway connected as peer {} in room id {} with TAP MTU {} over {}",
        gateway.welcome().peer_id(),
        gateway.welcome().room_id(),
        gateway.welcome().effective_tap_mtu(),
        gateway.welcome().mode()
    );
    println!("lanparty-gateway bridging frames; press Ctrl-C to stop");
    gateway.bridge_until_shutdown(socket).await?;

    Ok(())
}

#[cfg(not(target_os = "linux"))]
async fn run(_args: GatewayArgs) -> anyhow::Result<()> {
    anyhow::bail!("lanparty-gateway requires Linux AF_PACKET support");
}