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#![recursion_limit = "256"]

extern crate proc_macro;

mod read;
mod types;
mod write;

use crate::{read::impl_read, types::Element, write::impl_write};
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(Xml, attributes(xml))]
pub fn derive_xml(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);

    let element = Element::parse(&input);

    let name = &input.ident;
    let generics = &input.generics;

    let impl_write = impl_write(&element);
    let impl_read = impl_read(&element);

    let gen = quote! {
        impl #generics #name #generics {
            pub fn write<W>(&self, w: &mut ::quick_xml::Writer<W>) -> Result<()>
            where
                W: ::std::io::Write,
            {
                use quick_xml::events::*;

                #impl_write

                Ok(())
            }

            pub fn read<B>(
                r: &mut ::quick_xml::Reader<B>,
                bs: Option<::quick_xml::events::BytesStart>,
            ) -> Result<Self>
            where
                B: ::std::io::BufRead,
            {
                use quick_xml::events::*;
                use std::borrow::Borrow;
                use std::convert::AsRef;
                use std::str::FromStr;

                #impl_read
            }
        }
    };

    gen.into()
}