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mod attrs;
mod container;
mod ctxt;
mod decl;
mod derive;
mod parser;
mod type_alias;
mod typescript;
mod wasm_bindgen;

use syn::{parse_macro_input, DeriveInput};

fn declare_impl(
    args: proc_macro2::TokenStream,
    item: syn::Item,
) -> darling::Result<proc_macro2::TokenStream> {
    match item {
        syn::Item::Type(item) => type_alias::expend(item),
        syn::Item::Enum(item) => derive::expand_by_attr(args, item.into()),
        syn::Item::Struct(item) => derive::expand_by_attr(args, item.into()),
        _ => Err(darling::Error::custom(
            "#[declare] can only be applied to a struct, enum, or type alias.",
        )
        .with_span(&args)),
    }
}

#[proc_macro_attribute]
pub fn declare(
    args: proc_macro::TokenStream,
    item: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let item: syn::Item = parse_macro_input!(item);
    let args = proc_macro2::TokenStream::from(args);

    declare_impl(args, item)
        .unwrap_or_else(|err| err.write_errors())
        .into()
}

#[proc_macro_derive(Tsify, attributes(tsify, serde))]
pub fn derive_tsify(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let item: DeriveInput = parse_macro_input!(input);

    derive::expand(item)
        .unwrap_or_else(|err| err.write_errors())
        .into()
}