fn main() {
    println!("cargo:rerun-if-env-changed=LOGOS_DELIVERY_LIB_DIR");
    println!("cargo::rustc-check-cfg=cfg(logos_delivery)");

    let feature_enabled = std::env::var("CARGO_FEATURE_EMBEDDED_P2P_DELIVERY").is_ok();
    let lib_dir = std::env::var("LOGOS_DELIVERY_LIB_DIR");

    let lib_dir = match lib_dir {
        Ok(dir) => dir,
        Err(_) if !feature_enabled => return,
        Err(_) => {
            // Feature is on but no library path — enable compilation, skip linking.
            println!("cargo:rustc-cfg=logos_delivery");
            return;
        }
    };

    println!("cargo:rustc-cfg=logos_delivery");

    println!("cargo:rustc-link-search=native={lib_dir}");
    println!("cargo:rustc-link-lib=dylib=logosdelivery");

    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
    match target_os.as_str() {
        "macos" | "linux" => println!("cargo:rustc-link-arg=-Wl,-rpath,{lib_dir}"),
        other => panic!("unsupported OS for logos-delivery transport: {other}"),
    }
}