extern crate bindgen;
extern crate pkg_config;

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

fn main() {
    let pkgconfig = pkg_config::Config::new();
    let mraa_config = pkgconfig
        .probe("mraa")
        .expect("pkg_config probe failed for mraa");

    let _ = pkgconfig
        .probe("json-c");
        // .expect("pkg_config probe failed for json-c");

    // Tell cargo to invalidate the built crate whenever the wrapper changes
    println!("cargo:rerun-if-changed=src/wrapper.h");

    let mut clang_args: Vec<String> = Vec::new();
    for include_dir in &mraa_config.include_paths {
        clang_args.push("-I".to_owned());
        clang_args.push(include_dir.to_str().unwrap().to_owned());
    }

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let mraa_bindings = bindgen::Builder::default()
        .clang_args(clang_args)
        // The input header we would like to generate
        // bindings for.
        .header("src/wrapper.h")
        .whitelist_type("mraa_.*")
        .whitelist_function("mraa_.*")
        .whitelist_var("mraa_.*")
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        // 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());
    mraa_bindings
        .write_to_file(out_path.join("mraa_bindings.rs"))
        .expect("Couldn't write bindings!");
}