/*
 * Copyright (c) 2026-present, the Ladybird developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

use std::env;
use std::error::Error;
use std::path::PathBuf;

fn main() -> Result<(), Box<dyn Error>> {
    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR")?);
    let out_dir = PathBuf::from(env::var("OUT_DIR")?);

    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=cbindgen.toml");
    println!("cargo:rerun-if-env-changed=FFI_OUTPUT_DIR");
    println!("cargo:rerun-if-changed=src");

    let ffi_out_dir = env::var("FFI_OUTPUT_DIR")
        .map(PathBuf::from)
        .unwrap_or_else(|_| out_dir.clone());

    cbindgen::generate(manifest_dir).map_or_else(
        |error| match error {
            cbindgen::Error::ParseSyntaxError { .. } => {}
            e => panic!("{e:?}"),
        },
        |bindings| {
            let header_path = out_dir.join("RustFFI.h");
            bindings.write_to_file(&header_path);

            if ffi_out_dir != out_dir {
                bindings.write_to_file(ffi_out_dir.join("RustFFI.h"));
            }
        },
    );

    Ok(())
}