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mod args;
mod api;
mod message;
mod util;

use args::ApiArgs;

use proc_macro::TokenStream;
use syn::{parse_macro_input, ItemFn, DeriveInput};

/*
#[api(Request)]
async fn request(req: Request, session: &Session) -> Result<Response> {
	todo!()
}
*/
#[proc_macro_attribute]
pub fn api(attrs: TokenStream, item: TokenStream) -> TokenStream {
	let args = parse_macro_input!(attrs as ApiArgs);
	let item = parse_macro_input!(item as ItemFn);

	let stream = api::expand(args, item);

	stream
		.map(|stream| stream.into())
		.unwrap_or_else(|e| e.to_compile_error())
		.into()
}


/*
#[derive(IntoMessage)]
#[message(json)]
*/
#[proc_macro_derive(IntoMessage, attributes(message))]
pub fn derive_into_message(input: TokenStream) -> TokenStream {
	let input = parse_macro_input!(input as DeriveInput);

	message::into_expand(input)
		.unwrap_or_else(|e| e.to_compile_error())
		.into()
}

#[proc_macro_derive(FromMessage, attributes(message))]
pub fn derive_from_message(input: TokenStream) -> TokenStream {
	let input = parse_macro_input!(input as DeriveInput);

	message::from_expand(input)
		.unwrap_or_else(|e| e.to_compile_error())
		.into()
}