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

fn main() {
    // Two separate problems to defeat in the cdylib link:
    // 1. cc-rs uses -ffunction-sections, Rust's cdylib runs --gc-sections, and
    //    nothing internal references qt_plugin_instance / qt_plugin_query_metadata_v2
    //    (moc emits them as dlsym entry points for Qt's plugin loader, not for
    //    in-binary calls), so the linker drops them entirely. --undefined=<sym>
    //    anchors them past --gc-sections.
    // 2. Even once present, Rust's cdylib link hides C++ static-archive symbols by
    //    default - they end up as local (lowercase t in nm), invisible to dlsym.
    //    --export-dynamic-symbol=<sym> doesn't help: that flag only applies to
    //    -shared=no (executables). For shared libraries, bare --export-dynamic
    //    exports all global symbols and overrides the hide-by-default.
    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");

    // 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();
}