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// This file is part of Locus <https://github.com/gemrest/locus>.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Copyright (C) 2022-2023 Fuwn <[email protected]>
// SPDX-License-Identifier: GPL-3.0-only

#![deny(
  warnings,
  nonstandard_style,
  unused,
  future_incompatible,
  rust_2018_idioms,
  unsafe_code
)]
#![deny(clippy::all, clippy::nursery, clippy::pedantic)]
#![recursion_limit = "128"]

use proc_macro::TokenStream;
use quote::quote;
use syn::Ident;

/// Legitimise and mount Locus modules
///
/// # Panics
///
/// This *should* never panic, but if it does, we don't care.
#[proc_macro]
pub fn modules(input: TokenStream) -> TokenStream {
  let input_modules: Vec<Ident> = syn::parse_macro_input!(
    input with syn::punctuated::Punctuated::<Ident, syn::Token![,]>::parse_terminated
  )
    .into_iter()
    .collect();
  let mut legitimised_modules = quote!();
  let mut mounted_modules = quote!();

  for module_name in input_modules {
    if module_name == "search" {
      legitimised_modules.extend(quote!(
        pub mod search;
      ));
      mounted_modules.extend(quote!(router.attach_stateless(search::module);));
    } else {
      legitimised_modules.extend(quote!(mod #module_name;));
      mounted_modules
        .extend(quote!(router.attach_stateless(#module_name::module);));
    }
  }

  quote! {
    #legitimised_modules

    pub fn module(router: &mut ::windmark::router::Router) {
      #mounted_modules
    }
  }
  .into()
}