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use proc_macro2::Ident;
use quote::format_ident;
use syn::{bracketed, parse::Parse, punctuated::Punctuated, LitStr, Token};

pub enum InputField {
    Name(LitStr),
    TableGen(LitStr),
    TdFile(LitStr),
    IncludeDirectories(Punctuated<LitStr, Token![,]>),
}

impl Parse for InputField {
    fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> {
        let ident = input.parse::<Ident>()?;

        input.parse::<Token![:]>()?;

        if ident == format_ident!("name") {
            Ok(Self::Name(input.parse()?))
        } else if ident == format_ident!("table_gen") {
            Ok(Self::TableGen(input.parse()?))
        } else if ident == format_ident!("td_file") {
            Ok(Self::TdFile(input.parse()?))
        } else if ident == format_ident!("include_dirs") {
            let content;
            bracketed!(content in input);
            Ok(Self::IncludeDirectories(
                Punctuated::<LitStr, Token![,]>::parse_terminated(&content)?,
            ))
        } else {
            Err(input.error(format!("invalid field {}", ident)))
        }
    }
}