fn main() {
    let lib = probe_libqalculate();
    build_cxx_bridge(&lib);
    emit_cargo_metadata();
}

fn probe_libqalculate() -> pkg_config::Library {
    pkg_config::probe_library("libqalculate")
        .expect("libqalculate not found — install it via your package manager")
}

fn build_cxx_bridge(lib: &pkg_config::Library) {
    cxx_build::bridge("src/qalc/mod.rs")
        .file("src/qalc/qalc_bridge.cc")
        .includes(&lib.include_paths)
        .include("src")
        .flag_if_supported("-std=c++17")
        .compiler("g++")
        .compile("qalc-bridge");
}

fn emit_cargo_metadata() {
    let out_dir = std::env::var("OUT_DIR").unwrap();
    println!("cargo:rustc-link-search=native={out_dir}");
    println!("cargo:rustc-link-lib=static=qalc-bridge");

    for file in &[
        "src/qalc/mod.rs",
        "src/qalc/qalc_bridge.cc",
        "src/qalc/qalc_bridge.h",
    ] {
        println!("cargo:rerun-if-changed={file}");
    }
}