use proc_macro::TokenStream;
use quote::ToTokens;
use syn::parse_macro_input;

mod fc;
mod htm;
mod ifmt;
mod props;
mod rsxt;
mod util;

/// The html! macro makes it easy for developers to write jsx-style markup in their components.
/// We aim to keep functional parity with html templates.
#[proc_macro]
pub fn html(s: TokenStream) -> TokenStream {
    match syn::parse::<htm::HtmlRender>(s) {
        Err(e) => e.to_compile_error().into(),
        Ok(s) => s.to_token_stream().into(),
    }
}

/// The html! macro makes it easy for developers to write jsx-style markup in their components.
/// We aim to keep functional parity with html templates.
#[proc_macro]
pub fn rsx(s: TokenStream) -> TokenStream {
    match syn::parse::<rsxt::RsxRender>(s) {
        Err(e) => e.to_compile_error().into(),
        Ok(s) => s.to_token_stream().into(),
    }
}

// #[proc_macro_attribute]
// pub fn fc(attr: TokenStream, item: TokenStream) -> TokenStream {

/// Label a function or static closure as a functional component.
/// This macro reduces the need to create a separate properties struct.
///
/// Using this macro is fun and simple
///
/// ```ignore
///
/// #[fc]
/// fn Example(ctx: Context, name: &str) -> DomTree {
///     ctx.render(rsx! { h1 {"hello {name}"} })
/// }
/// ```
#[proc_macro_attribute]
pub fn fc(_attr: TokenStream, item: TokenStream) -> TokenStream {
    match syn::parse::<fc::FunctionComponent>(item) {
        Err(e) => e.to_compile_error().into(),
        Ok(s) => s.to_token_stream().into(),
    }
}

#[proc_macro]
pub fn format_args_f(input: TokenStream) -> TokenStream {
    use ifmt::*;
    let item = parse_macro_input!(input as IfmtInput);
    format_args_f_impl(item)
        .unwrap_or_else(|err| err.to_compile_error())
        .into()
}

#[proc_macro_derive(Props, attributes(builder))]
pub fn derive_typed_builder(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let input = parse_macro_input!(input as syn::DeriveInput);
    match props::impl_my_derive(&input) {
        Ok(output) => output.into(),
        Err(error) => error.to_compile_error().into(),
    }
}