use quote::quote;

use crate::util::syn_path_to_string;

pub fn generate(
    visibility: &syn::Visibility,
    engine_crate_path: &syn::Path,
) -> proc_macro2::TokenStream
{
    match visibility {
        syn::Visibility::Public(_) => {
            quote! { #engine_crate_path::reflection::Visibility::Pub }
        }
        syn::Visibility::Restricted(vis_restricted) => {
            let vis_scope = if vis_restricted.in_token.is_some() {
                let in_path = syn_path_to_string(&vis_restricted.path);

                quote! {
                    #engine_crate_path::reflection::VisibilityScope::In(
                        std::borrow::Cow::Borrowed(#in_path)
                    )
                }
            } else {
                let Some(scope) = vis_restricted.path.get_ident() else {
                    unreachable!();
                };

                if scope == "crate" {
                    quote! { #engine_crate_path::reflection::VisibilityScope::Crate }
                } else if scope == "super" {
                    quote! { #engine_crate_path::reflection::VisibilityScope::Super }
                } else if scope == "self" {
                    quote! { #engine_crate_path::reflection::VisibilityScope::SelfModule }
                } else {
                    unreachable!();
                }
            };

            quote! { #engine_crate_path::reflection::Visibility::PubScoped(#vis_scope) }
        }
        syn::Visibility::Inherited => {
            quote! { #engine_crate_path::reflection::Visibility::Private }
        }
    }
}