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//! proc-macro entrypoint.

pub mod prelude;

mod ligen;
mod ligen_project;
mod ligen_dependencies;
mod proc_macros;

pub use ligen::*;
pub use ligen_project::*;
pub use ligen_dependencies::*;
pub use proc_macros::*;
pub use rust_proc_macro::*;

// TODO: Can this be moved to a better place?
#[cfg(test)]
mod test {
    use crate::proc_macro::ligen;
    use quote::quote;
    use proc_macro2::TokenStream;
    use quote::*;
    use syn::parse_quote::parse;

    fn extract_struct_attributes_and_item(
        item_impl: &TokenStream,
    ) -> Result<(TokenStream, TokenStream), &'static str> {
        let mut item: syn::ItemStruct = parse(item_impl.clone());
        let ligen_attribute = item
            .attrs
            .iter()
            .find(|attr| attr.path.to_token_stream().to_string() == "ligen")
            .expect("Couldn't find ligen");
        let meta = ligen_attribute.parse_meta().expect("Couldn't parse Meta");
        if let syn::Meta::List(ref meta_list) = meta {
            item.attrs.clear();
            Ok((meta_list.nested.to_token_stream(), item.to_token_stream()))
        } else {
            Err("Couldn't find attribute.")
        }
    }

    fn extract_impl_attributes_and_item(
        item_impl: &TokenStream,
    ) -> Result<(TokenStream, TokenStream), &'static str> {
        let mut item: syn::ItemImpl = parse(item_impl.clone());
        let ligen_attribute = item
            .attrs
            .iter()
            .find(|attr| attr.path.to_token_stream().to_string() == "ligen")
            .expect("Couldn't find ligen");
        let meta = ligen_attribute.parse_meta().expect("Couldn't parse Meta");
        if let syn::Meta::List(ref meta_list) = meta {
            item.attrs.clear();
            Ok((meta_list.nested.to_token_stream(), item.to_token_stream()))
        } else {
            Err("Couldn't find attribute.")
        }
    }

    #[test]
    fn item_struct() {
        let input = quote! {
            #[ligen(c, cpp)]
            struct Object {}
        };

        let expected = quote! {
            #[ligen_c()]
            #[ligen_cpp()]
            struct Object {}
        };

        let (attributes, item) = extract_struct_attributes_and_item(&input)
            .expect("Couldn't extract attributes and item.");
        let token_stream = ligen(Default::default(), attributes, item);
        assert_eq!(token_stream.to_string(), expected.to_string());
    }

    #[test]
    fn item_impl() {
        let input = quote! {
            #[ligen(c(integer = "sized"), cpp(float = "sized"))]
            impl Object {}
        };

        let expected = quote! {
            #[ligen_c(integer = "sized")]
            #[ligen_cpp(float = "sized")]
            impl Object {}
        };

        let (attributes, item) = extract_impl_attributes_and_item(&input)
            .expect("Couldn't extract attributes and item.");
        let token_stream = ligen(Default::default(), attributes, item);
        assert_eq!(token_stream.to_string(), expected.to_string());
    }
}