use proc_macro2::LexError;
use syn::Ident;

pub mod macros {
    macro_rules! tkn_err_inner {
        ($str:expr, $span:expr) => {{
            let err_inner: darling::Error = darling::Error::custom($str).with_span($span);
            err_inner
        }};
    }

    macro_rules! tkn_err {
        ($str:expr, $span:expr) => {
            Err(crate::utils::macros::tkn_err_inner!($str, $span))
        };
    }

    pub(crate) use tkn_err;
    pub(crate) use tkn_err_inner;
}

const IDENT_OPTION_ERR: &str = "Unable to get ident from option";

pub fn ident_option_to_darling_err(ident: Option<&Ident>) -> Result<&Ident, darling::Error> {
    ident.ok_or_else(|| darling::Error::custom(IDENT_OPTION_ERR))
}

pub fn str_literal_token(
    str_literal: &str,
    err_ident: &Ident,
) -> Result<proc_macro2::TokenStream, darling::Error> {
    format!(r#""{}""#, str_literal)
        .parse()
        .map_err(|e: LexError| {
            darling::Error::custom(format!("Unable to parse string literal: {}", e))
                .with_span(err_ident)
        })
}