extern crate bindgen;
extern crate cc;
extern crate glob;

use glob::glob;
use std::env;

fn expect_env(key: &str) -> String {
  let value = env::var(key);
  if value.is_err() {
    eprintln!("{} environment variable is not defined.", key);
    eprintln!("Make sure you're running cargo via the `napi` wrapper script to assign correct environment variables and options.");
    std::process::exit(1);
  };
  value.unwrap()
}

fn main() {
  let node_include_path = expect_env("NODE_INCLUDE_PATH");
  let node_major_version = expect_env("NODE_MAJOR_VERSION");

  println!("cargo:rerun-if-env-changed=NODE_INCLUDE_PATH");
  for entry in glob("./src/sys/**/*.*").unwrap() {
    println!(
      "cargo:rerun-if-changed={}",
      entry.unwrap().to_str().unwrap()
    );
  }

  // Activate the "node8" or "node9" feature for compatibility with
  // different versions of Node.js/N-API.
  println!("cargo:rustc-cfg=node{}", node_major_version);

  bindgen::Builder::default()
    .header("src/sys/bindings.h")
    .clang_arg(String::from("-I") + &node_include_path)
    .rustified_enum("(napi_|uv_).+")
    .whitelist_function("(napi_|uv_|extras_).+")
    .whitelist_type("(napi_|uv_|extras_).+")
    .generate()
    .expect("Unable to generate napi bindings")
    .write_to_file("src/sys/bindings.rs")
    .expect("Unable to write napi bindings");

  cc::Build::new()
    .cpp(true)
    .include(&node_include_path)
    .file("src/sys/bindings.cc")
    .flag("-std=c++0x")
    .flag("-Wno-unused-parameter")
    .compile("extras");
}