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/*
    Appellation: scsys-derive <library>
    Creator: FL03 <jo3mccain@icloud.com>
    Description:
        ... Summary ...
*/
extern crate proc_macro;
extern crate quote;
extern crate syn;

use proc_macro::TokenStream;
use syn::{parse_macro_input, DeriveInput};

#[proc_macro_derive(Hash)]
pub fn hashable(input: TokenStream) -> TokenStream {
    let ast = parse_macro_input!(input as DeriveInput);
    let gen = impl_hashable(&ast);

    gen.into()
}

fn impl_hashable(ast: &syn::DeriveInput) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let res = quote::quote! {
        impl Hashable for #name {
            fn hash(&self) -> scsys::prelude::H256 {
                scsys::prelude::hasher(&self).into()
            }
        }
    };
    res
}

#[proc_macro_derive(Named, attributes(Alternative))]
pub fn named(input: TokenStream) -> TokenStream {
    // Parse the inputs into the proper struct
    let ast = parse_macro_input!(input as DeriveInput);

    // Build the impl
    let gen = impl_named(&ast);

    gen.into()
}

pub(crate) fn impl_named(ast: &syn::DeriveInput) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let res = quote::quote! {
        impl Named for #name {
            fn name() -> String {
                format!("{}", stringify!(#name))
            }
        }
    };
    res
}

#[proc_macro_derive(SerdeDisplay)]
pub fn serde_display(input: TokenStream) -> TokenStream {
    // Parse the inputs into the proper struct
    let ast = parse_macro_input!(input as DeriveInput);

    // Build the impl
    let gen = impl_serde_display(&ast);

    gen.into()
}

pub(crate) fn impl_serde_display(ast: &syn::DeriveInput) -> proc_macro2::TokenStream {
    let name = &ast.ident;
    let res = quote::quote! {
        impl std::fmt::Display for #name {
                fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
                    write!(f, "{}", scsys::prelude::fnl_remove(serde_json::to_string(&self).unwrap()))
                }
            }
    };
    res
}