use proc_macro::TokenStream;

#[path = "../../../../guests_macro/src/parse_fn.rs"]
mod parse_fn;
use crate::parse_fn::{ split_fn, args_split, args_divide, group_streams };

#[proc_macro]
pub fn make_wrapper(item: TokenStream) -> TokenStream {
    let (name, args, ret) = split_fn(&item);

    let (patterns, types) = args_divide(&args);
    let ts_patterns = group_streams(&patterns);
    let ts_types = group_streams(&types);

    let mut out = TokenStream::new();
    // NOTE: The first read returns public data, the second returns private
    out.extend(format!("let {} : {} = read();", ts_patterns, ts_types).parse::<TokenStream>());
    out.extend(format!("commit::<{}>(&zkp::{}{});", ret, name, ts_patterns).parse::<TokenStream>());

    let mut block = TokenStream::new();
    block.extend(format!("{{ {} }}", out).parse::<TokenStream>());
    block
}