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

#[proc_macro_derive(TeravoltMessage)]
pub fn message(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    let ident = input.ident.clone();

    let expanded = quote! {
        impl TeravoltMessage for #ident {
            fn as_message(&self) -> Message {
                crate::Message::new::<#ident>(self.clone())
            }

            fn id() -> std::any::TypeId {
                std::any::TypeId::of::<#ident>()
            }
        }
    };

    let tokens = TokenStream::from(expanded);

    //panic!(tokens.to_string());

    tokens
}