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

const CALLEE_NAME: &str = "Callee";

fn main()
{
	let callee_root = env::var("CALLEE_PATH").expect("Callee path variable must be available");
	let lean_root = env::var("LEAN_ROOT").expect("Lean root must exist");
	println!("cargo:rustc-link-search={callee_root}");
	println!("cargo:rustc-link-search={lean_root}/lib/lean");
	println!("cargo:rustc-link-lib={CALLEE_NAME}");
	//println!("cargo:rustc-link-lib=Init_shared");
	println!("cargo:rustc-link-lib=leanshared");

	// The bindgen::Builder is the main entry point
	// to bindgen, and lets you build up options for
	// the resulting bindings.
	let bindings = bindgen::Builder::default()
		// The input header we would like to generate
		// bindings for.
		.header(format!("{lean_root}/include/lean/lean.h"))
		// Tell cargo to invalidate the built crate whenever any of the
		// included header files changed.
		.parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
		// Finish the builder and generate the bindings.
		.generate()
		// Unwrap the Result and panic on failure.
		.expect("Unable to generate bindings");

	// Write the bindings to the $OUT_DIR/bindings.rs file.
	let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
	bindings
		.write_to_file(out_path.join("lean.rs"))
		.expect("Couldn't write bindings!");
}