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 exports
    //    only Rust-public symbols - everything else, including our anchored C++
    //    plugin symbols, is hidden as local. Neither --export-dynamic nor
    //    --export-dynamic-symbol overrides an explicit version script. The fix
    //    is --dynamic-list=<file>, which is additive: it appends entries to the
    //    dynamic symtab without fighting the version script's hides.
    for sym in ["qt_plugin_instance", "qt_plugin_query_metadata_v2"] {
        println!("cargo:rustc-link-arg=-Wl,--undefined={sym}");
    }
    let dynlist = std::path::Path::new(env!("CARGO_MANIFEST_DIR")).join("qt_plugin_exports.txt");
    println!("cargo:rerun-if-changed={}", dynlist.display());
    println!(
        "cargo:rustc-link-arg=-Wl,--dynamic-list={}",
        dynlist.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 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();
}