use std::{env, path::PathBuf};

fn main() {
    let out_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
    let root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap())
        .parent()
        .unwrap()
        .to_path_buf();
    let ebpf_target = root.join("target/bpfel-unknown-none/release/xdp-firewall");

    if !ebpf_target.exists() {
        let status = std::process::Command::new("cargo")
            .args(["run", "--package", "xtask", "--", "build-ebpf"])
            .current_dir(&root)
            .status()
            .expect("failed to build eBPF program");
        assert!(status.success(), "eBPF build failed");
    }

    std::fs::copy(&ebpf_target, out_dir.join("xdp-firewall.o")).unwrap();
    println!("cargo:rerun-if-changed={}", ebpf_target.display());
}