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#![warn(rust_2018_idioms)]

mod composite;
mod entity;
mod r#enum;

#[derive(Clone, Debug)]
struct Params {
    internal: bool,
}

impl Default for Params {
    fn default() -> Self {
        Self {
            internal: false,
        }
    }
}

impl syn::parse::Parse for Params {
    fn parse(input: syn::parse::ParseStream<'_>) -> syn::parse::Result<Self> {
        let content;
        syn::parenthesized!(content in input);

        let internal = match content.parse::<syn::Ident>() {
            Ok(internal) => internal == "internal",
            Err(_) => false,
        };

        Ok(Params {
            internal,
        })
    }
}

#[derive(Clone, Debug)]
struct FieldParams {
    default: bool,
}

impl Default for FieldParams {
    fn default() -> Self {
        Self {
            default: false,
        }
    }
}

impl syn::parse::Parse for FieldParams {
    fn parse(input: syn::parse::ParseStream<'_>) -> syn::parse::Result<Self> {
        let content;
        syn::parenthesized!(content in input);

        let default = match content.parse::<syn::Ident>() {
            Ok(default) => default == "default",
            Err(_) => false,
        };

        Ok(FieldParams {
            default,
        })
    }
}

/**
 * Impl [`Composite`] trait.
 *
 * [`Composite`]: trait.Composite.html
 */
#[proc_macro_derive(Composite, attributes(composite))]
pub fn composite_derive(
    input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let ast = syn::parse(input).unwrap();

    composite::impl_macro(&ast)
}

/**
 * Impl [`Entity`] trait.
 *
 * [`Entity`]: trait.Entity.html
 */
#[proc_macro_derive(Entity, attributes(entity, elephantry))]
pub fn entity_derive(
    input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    let ast = syn::parse(input).unwrap();

    entity::impl_macro(&ast)
}

/**
 * Impl [`Enum`] trait.
 *
 * [`Enum`]: trait.Enum.html
 */
#[proc_macro_derive(Enum, attributes(r#enum))]
pub fn enum_derive(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
    let ast = syn::parse(input).unwrap();

    r#enum::impl_macro(&ast)
}