use cxx_qt_build::{CxxQtBuilder, PluginType, QmlModule};

fn main() {
    // Two separate problems to defeat in the cdylib link for cxx-qt's QML plugin
    // entry points (qt_plugin_instance / qt_plugin_query_metadata_v2):
    // 1. cc-rs uses -ffunction-sections, Rust's cdylib runs --gc-sections, and
    //    nothing internal references those symbols (moc emits them as dlsym
    //    entry points), so the linker drops them entirely. --undefined=<sym>
    //    anchors them past --gc-sections.
    // 2. Rust's cdylib link passes an explicit --version-script that lists Rust
    //    public symbols under `global:` and ends with `local: *;`, hiding
    //    everything else. --dynamic-list and --export-dynamic both lose to that
    //    `local: *;`. Multiple --version-script flags merge per ld(1), and
    //    explicit `global:` entries override the wildcard local, so we pass a
    //    second version script that adds the qt_plugin entry points.
    for sym in ["qt_plugin_instance", "qt_plugin_query_metadata_v2"] {
        println!("cargo:rustc-link-arg=-Wl,--undefined={sym}");
    }
    let vscript = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("qt_plugin_exports.txt");
    println!("cargo:rerun-if-changed={}", vscript.display());
    println!(
        "cargo:rustc-link-arg=-Wl,--version-script={}",
        vscript.display()
    );

    // Crane's deps-only build stubs out lib.rs and removes our bridge sources to
    // build a dummy crate that only compiles dependencies. Skip cxx-qt codegen in
    // that case - we just want cxx-qt-lib (the heavy dep) cached, not our own glue.
    let manifest = std::path::Path::new(env!("CARGO_MANIFEST_DIR"));
    let bridge_files = [
        "src/system_stats.rs",
        "src/cpu_service.rs",
        "src/modules_service.rs",
        "src/theme_service.rs",
    ];
    if !bridge_files.iter().all(|p| manifest.join(p).exists()) {
        return;
    }

    CxxQtBuilder::new_qml_module(QmlModule::new("NovaStats").plugin_type(PluginType::Dynamic))
        .files(bridge_files)
        .build();
}