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use proc_macro2::TokenStream;
use quote::quote;
use syn::{Data, DeriveInput, Meta};

use super::{
    super::TraitHandler,
    models::{FieldAttributeBuilder, TypeAttributeBuilder},
};
use crate::Trait;

pub struct CloneUnionHandler;

impl TraitHandler for CloneUnionHandler {
    fn trait_meta_handler(
        ast: &DeriveInput,
        tokens: &mut TokenStream,
        traits: &[Trait],
        meta: &Meta,
    ) {
        let _ = TypeAttributeBuilder {
            enable_flag: true, enable_bound: false
        }
        .from_clone_meta(meta);

        if let Data::Union(data) = &ast.data {
            for field in data.fields.named.iter() {
                let _ = FieldAttributeBuilder {
                    enable_impl: false
                }
                .from_attributes(&field.attrs, traits);
            }
        }

        let ident = &ast.ident;

        let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();

        let compare_impl = quote! {
            impl #impl_generics core::clone::Clone for #ident #ty_generics #where_clause {
                #[inline]
                fn clone(&self) -> Self {
                    *self
                }
            }
        };

        tokens.extend(compare_impl);
    }
}