#[cfg(target_os = "linux")]
mod linux {
    use std::{env, path::PathBuf};

    pub fn build_bindings() {
        let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());

        #[cfg(feature = "buildtime_bindgen")]
        {
            let bindings = bindgen::Builder::default()
                .rust_target(bindgen::RustTarget::Stable_1_40)
                .derive_default(true)
                .header("c/wireguard.h")
                .impl_debug(true)
                .allowlist_function("wg_.*")
                .bitfield_enum("wg_peer_flags")
                .bitfield_enum("wg_device_flags");

            let bindings = bindings.generate().expect("Unable to generate bindings");
            bindings
                .write_to_file(out_path.join("bindings.rs"))
                .expect("Couldn't write bindings!");
        }
        #[cfg(not(feature = "buildtime_bindgen"))]
        {
            std::fs::copy("bindgen-bindings/bindings.rs", out_path.join("bindings.rs"))
                .expect("Could not copy bindings to output directory");
        }
    }

    pub fn build_library() {
        cc::Build::new()
            .file("c/wireguard.c")
            .warnings(true)
            .extra_warnings(true)
            .warnings_into_errors(true)
            .flag_if_supported("-Wno-unused-parameter")
            .compile("wireguard");
    }
}

#[cfg(target_os = "linux")]
fn main() {
    linux::build_bindings();
    linux::build_library();
}

#[cfg(not(target_os = "linux"))]
fn main() {}