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extern crate proc_macro;
use quote::quote;
use syn::parse_macro_input;

#[proc_macro_attribute]
pub fn event(
    _args: proc_macro::TokenStream,
    input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let event_strct = parse_macro_input!(input as syn::ItemEnum);
    let event_name = &event_strct.ident;
    let (impl_gen, type_gen, where_clause) = event_strct.generics.split_for_impl();

    proc_macro::TokenStream::from({
        quote! {
            #[derive(BorshSerialize, BorshDeserialize, PartialEq, Eq, Debug, Clone)]
            #event_strct

            #[automatically_derived]
            impl #impl_gen #event_name #type_gen #where_clause {

              pub fn wrap<'info>(&self, noop_program: AccountInfo<'info>) -> ProgramResult {
                invoke(
                    &spl_noop::instruction(self.try_to_vec()?),
                    &[noop_program],
                )
              }

            }
        }
    })
}