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

fn main() {
    // Trying to find python3
    let lib = pkg_config::probe_library("python3").expect("Python3 is not available for linking");

    // The bindgen::Builder is the main entry point
    // to bindgen, and lets you build up options for
    // the resulting bindings.
    let mut bindings_builder = bindgen::Builder::default()
        // The input header we would like to generate
        // bindings for.
        .header("csrc/wrapper.h")
        // Tell cargo to invalidate the built crate whenever any of the
        // included header files changed.
        .parse_callbacks(Box::new(bindgen::CargoCallbacks::new()))
        .blocklist_var("FP_INT_UPWARD")
        .blocklist_var("FP_NORMAL")
        .blocklist_var("FP_SUBNORMAL")
        .blocklist_var("FP_INFINITE")
        .blocklist_var("FP_INT_TONEAREST")
        .blocklist_var("FP_INT_TONEARESTFROMZERO")
        .blocklist_var("FP_INT_TOWARDZERO")
        .blocklist_var("FP_NAN")
        .blocklist_var("FP_ZERO")
        .blocklist_var("FP_INT_DOWNWARD");
    // Finish the builder and generate the bindings.
    for path in lib.include_paths {
        let Some(lib_path) = path.as_path().to_str() else {
            continue;
        };
        bindings_builder = bindings_builder.clang_arg(format!("-I{}", lib_path));
    }
    let bindings = bindings_builder
        .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("bindings.rs"))
        .expect("Couldn't write bindings!");
}