use std::path::{Path, PathBuf};

fn main() -> std::io::Result<()> {
    compile_proto(&["examples/routeguide/route_guide.proto"], ".routeguide")?;
    Ok(())
}

fn compile_proto(paths: &[&str], package: &str) -> std::io::Result<()> {
    for path in paths {
        println!("cargo:rerun-if-changed={path}");
    }

    let descriptor_path = PathBuf::from(std::env::var_os("OUT_DIR").unwrap())
        .join("proto")
        .join(package)
        .with_extension("bin");
    std::fs::create_dir_all(descriptor_path.parent().unwrap())?;

    let parent_dir = Path::new(paths[0]).parent().unwrap();

    prost_build::Config::new()
        .file_descriptor_set_path(&descriptor_path)
        .compile_well_known_types()
        .extern_path(".google.protobuf", "::pbjson_types")
        .compile_protos(paths, &[parent_dir])?;

    let descriptors = std::fs::read(descriptor_path)?;
    pbjson_build::Builder::new()
        .register_descriptors(&descriptors)?
        .ignore_unknown_fields()
        .build(&[package])?;
    Ok(())
}