//! Read‑only eBPF sentinel for system monitoring.
//! Listens on a Unix socket and reports events to the Python manager.

use anyhow::Result;
use libbpf_rs::{skel::Skel, skel::SkelBuilder};
use std::os::unix::net::UnixListener;
use std::io::prelude::*;
use std::thread;

// Include the compiled eBPF skeleton (generated by libbpf-cargo or build.rs).
// In a real implementation you would have a separate .bpf.c file.
// mod bpf_skel {
//     include!(concat!(env!("OUT_DIR"), "/bpf_skel.rs"));
// }

fn main() -> Result<()> {
    println!("[eBPF Bridge] Starting read‑only sentinel stub");

    // // Load and attach the eBPF program (stubbed out for boilerplate)
    // let mut skel_builder = bpf_skel::BpfSkelBuilder::default();
    // let mut open_skel = skel_builder.open()?;
    // open_skel.load()?;
    // let mut skel = open_skel.attach()?;
    // println!("[eBPF Bridge] eBPF program loaded and attached");

    // Unix socket for communication with Python
    let socket_path = std::env::var("EBPF_SOCKET_PATH")
        .unwrap_or_else(|_| "/tmp/omniclaw_ebpf.sock".to_string());
    
    // Clean up old socket if it exists
    let _ = std::fs::remove_file(&socket_path);
    
    // Only bind on Unix systems; on Windows this will fail. We catch and log.
    #[cfg(unix)]
    {
        let listener = match UnixListener::bind(&socket_path) {
            Ok(l) => l,
            Err(e) => {
                eprintln!("[eBPF Bridge] Failed to bind to socket {}: {}", socket_path, e);
                return Err(e.into());
            }
        };
        println!("[eBPF Bridge] Listening on {}", socket_path);

        // Handle incoming connections
        for stream in listener.incoming() {
            match stream {
                Ok(mut stream) => {
                    let msg = b"eBPF bridge active, monitoring execve and network events\n";
                    stream.write_all(msg)?;
                }
                Err(e) => eprintln!("[eBPF Bridge] Connection error: {}", e),
            }
        }
    }
    
    #[cfg(not(unix))]
    {
        println!("[eBPF Bridge] Unix sockets are not available on this platform. Running in stub mode.");
        loop {
            thread::sleep(std::time::Duration::from_secs(60));
        }
    }

    Ok(())
}
