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

fn main() {
    // cc-rs compiles with -ffunction-sections, Rust's cdylib link runs --gc-sections,
    // and nothing internal references qt_plugin_instance/qt_plugin_query_metadata_v2
    // - moc generates them as Qt's plugin entry points for dlopen, not for in-binary
    // calls. So the linker drops them entirely (verified: `nm libNovaStats.so | grep
    // qt_plugin_instance` returns nothing, only the static const inside the dropped
    // function survives). --undefined anchors them past --gc-sections, then
    // --export-dynamic-symbol exposes them for Qt's dlsym lookup.
    for sym in ["qt_plugin_instance", "qt_plugin_query_metadata_v2"] {
        println!("cargo:rustc-link-arg=-Wl,--undefined={sym}");
        println!("cargo:rustc-link-arg=-Wl,--export-dynamic-symbol={sym}");
    }

    // 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 bridge_files = ["src/system_stats.rs", "src/cpu_service.rs"];
    if !bridge_files.iter().all(|p| std::path::Path::new(p).exists()) {
        return;
    }

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