use std::path::PathBuf;

fn main() {
    link_windows_libmpv();
    tauri_build::build()
}

/// Point the MSVC linker at `mpv.lib` for a Windows target.
///
/// `libmpv-sys` emits `rustc-link-lib=mpv` and nothing else; on Linux the
/// system library satisfies it. For Windows the import library and the DLL it
/// names are staged into `src-tauri/windows-libs/` by
/// `scripts/build-windows-cross.sh` from the builder image's pinned libmpv
/// build — the same directory `tauri.windows.conf.json` bundles the DLL from,
/// so what is linked against and what is shipped cannot come from two places.
///
/// TRACES: UR-004 | DR-237
fn link_windows_libmpv() {
    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() != Ok("windows") {
        return;
    }
    let dir = PathBuf::from(std::env::var("CARGO_MANIFEST_DIR").unwrap()).join("windows-libs");
    println!("cargo:rerun-if-changed={}", dir.join("mpv.lib").display());
    if !dir.join("mpv.lib").is_file() {
        panic!(
            "{} is missing. Windows builds link libmpv from the builder image; \
             build through scripts/build-windows-cross.sh, which stages it.",
            dir.join("mpv.lib").display()
        );
    }
    println!("cargo:rustc-link-search=native={}", dir.display());
}