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extern crate proc_macro;

use proc_macro::TokenStream;
use quote::{quote, ToTokens};
use syn::{parse_macro_input, ItemFn};

#[proc_macro_attribute]

pub fn ai_function(_attr: TokenStream, item: TokenStream) -> TokenStream {
    // parse input fun

    let input_fn: ItemFn = parse_macro_input!(item as ItemFn);

    // create string representation of function
    let function_str: String = format!("{}", input_fn.to_token_stream());

    // Define a new function with the same signature as the input function
    let fn_ident: proc_macro2::Ident = input_fn.sig.ident;

    let fn_inputs: syn::punctuated::Punctuated<syn::FnArg, syn::token::Comma> = input_fn.sig.inputs;

    let fn_generics: syn::Generics = input_fn.sig.generics;

    // Generate output function

    let output: proc_macro2::TokenStream = quote! {
        pub fn #fn_ident #fn_generics(#fn_inputs) -> &'static str {
            #function_str
        }
    };
    output.into()
}