use std::env;
use std::path::PathBuf;

fn main() {
    let header = PathBuf::from("../../include/hunjing/lingtai.h")
        .canonicalize()
        .expect("找不到引擎公共头");
    let bindings = bindgen::Builder::default()
        .header(header.to_string_lossy())
        .allowlist_function("hj_.*")
        .allowlist_type("Hj.*")
        .allowlist_var("HJ_.*")
        .generate()
        .expect("bindgen 生成失败（需要 libclang）");
    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
    bindings
        .write_to_file(out_dir.join("bindings.rs"))
        .expect("写 bindings.rs 失败");
    println!("cargo:rerun-if-changed={}", header.display());
    // 直接编译引擎源码（自包含）
    let src = PathBuf::from("../../src").canonicalize().expect("找不到引擎源码");
    for cpp in ["lingtai.cpp", "transform.cpp", "modules.cpp"] {
        println!("cargo:rustc-cxx=g++");
        let _ = cpp;
    }
    // 用 cc crate 风格手动调用：为最小依赖，此处直接输出编译指令给 rustc 链接预编译静态库
    // 简化：编译为单个静态库由 build.rs 调用 clang++
    // 逐个编译 .o，再归档为静态库
    let objects: Vec<_> = ["lingtai.cpp", "transform.cpp", "modules.cpp"]
        .iter()
        .map(|cpp| {
            let obj = out_dir.join(format!("{}.o", cpp.replace(".cpp", "")));
            let status = std::process::Command::new("clang++")
                .args(["-std=c++23", "-O2", "-c"])
                .arg(src.join(cpp))
                .arg("-I").arg(src.parent().unwrap().join("include"))
                .arg("-I").arg(&src)
                .arg("-fvisibility=hidden")
                .arg("-o").arg(&obj)
                .status()
                .expect("clang++ 启动失败");
            assert!(status.success(), "引擎编译失败：{cpp}");
            obj
        })
        .collect();
    let out_lib = out_dir.join("libhunjing_engine.a");
    let status = std::process::Command::new("ar")
        .arg("crus").arg(&out_lib)
        .args(&objects)
        .status()
        .expect("ar 启动失败");
    assert!(status.success(), "归档失败");
    println!("cargo:rustc-link-search=native={}", out_dir.display());
    println!("cargo:rustc-link-lib=static=hunjing_engine");
    println!("cargo:rustc-link-lib=dylib=c++");
}