use cmake::Config;
use std::{env, fs::File, path::PathBuf};

fn main() {
    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
    if env::var("DOCS_RS").is_ok() {
        println!("cargo:warning=Skipping spirv-to-dxil native build for docs.rs.");
        File::create(out_dir.join("bindings.rs")).unwrap();
        return;
    }

    let cmake_dst = Config::new("native")
        .build_target("mesa")
        .build();

    let object_dst = cmake_dst.join("build/mesa/lib");

    let header_dst = cmake_dst.join("build/mesa/src/mesa/src/microsoft/spirv_to_dxil");
    let header_compiler_dst = cmake_dst.join("build/mesa/src/mesa/src/microsoft/compiler");

    if cfg!(target_os = "windows") {
        println!("cargo:rustc-link-lib=Version");
    }

    println!("cargo:rustc-link-search=native={}", object_dst.display());
    println!("cargo:rustc-link-lib=static=spirv_to_dxil");
    println!("cargo:rustc-link-lib=static=vulkan_util");

    if !cfg!(feature = "included-bindings") {
        let bindings = bindgen::Builder::default()
            .header("native/wrapper.h")
            .clang_arg(format!("-F{}", header_dst.display()))
            .clang_arg(format!("-F{}", header_compiler_dst.display()))
            .clang_arg(format!("-I{}", header_dst.display()))
            .clang_arg(format!("-I{}", header_compiler_dst.display()))
            .parse_callbacks(Box::new(bindgen::CargoCallbacks))
            .generate()
            .expect("Unable to generate bindings");
        bindings
            .write_to_file(out_dir.join("bindings.rs"))
            .expect("Couldn't write bindings!");
    }
}