//! Link the vendored static libopus (UCRT MinGW ABI) + generate FFI bindings
//! from the vendored opus headers via bindgen (libclang). Same vendoring
//! approach as netdesk-vpx: a UCRT-ABI libopus.a so there is no vcpkg/MSYS2 or
//! runtime DLL dependency, and no fragile build-from-source (audiopus_sys's
//! build script mangles extended-length paths on this toolchain).
use std::path::PathBuf;

fn main() {
    let manifest = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap());
    let tp = manifest.join("..").join("third_party").join("ucrt64");
    let lib = tp.join("lib");
    let inc = tp.join("include");

    println!("cargo:rustc-link-search=native={}", lib.display());
    println!("cargo:rustc-link-lib=static=opus");
    println!("cargo:rerun-if-changed=wrapper.h");
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed={}", lib.join("libopus.a").display());

    if std::env::var("LIBCLANG_PATH").is_err() {
        for p in ["C:/Program Files/LLVM/bin", "C:/Program Files (x86)/LLVM/bin"] {
            if PathBuf::from(p).join("libclang.dll").exists() {
                std::env::set_var("LIBCLANG_PATH", p);
                break;
            }
        }
    }

    // OpusEncoder / OpusDecoder are opaque (used only through pointers), so
    // bindgen's default opaque representation is exactly right here — unlike
    // libvpx's config structs, we never set their fields.
    let regex = "^(opus|Opus|OPUS).*";
    let bindings = bindgen::Builder::default()
        .header("wrapper.h")
        .clang_arg(format!("-I{}", inc.display()))
        .allowlist_type(regex)
        .allowlist_var(regex)
        .allowlist_function(regex)
        .rustified_enum(regex)
        .trust_clang_mangling(false)
        .layout_tests(false)
        .generate_comments(false)
        .generate()
        .expect("bindgen libopus");
    bindings
        .write_to_file(PathBuf::from(std::env::var("OUT_DIR").unwrap()).join("opus_ffi.rs"))
        .expect("write opus_ffi.rs");
}