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// This file is part of Substrate.

// Copyright (C) 2020-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::{pallet::Def, COUNTER};
use frame_support_procedural_tools::get_doc_literals;
use syn::{spanned::Spanned, Ident};

///
/// * add various derive trait on GenesisConfig struct.
pub fn expand_genesis_config(def: &mut Def) -> proc_macro2::TokenStream {
	let count = COUNTER.with(|counter| counter.borrow_mut().inc());

	let (genesis_config, def_macro_ident, std_macro_ident) =
		if let Some(genesis_config) = &def.genesis_config {
			let def_macro_ident = Ident::new(
				&format!("__is_genesis_config_defined_{}", count),
				genesis_config.genesis_config.span(),
			);

			let std_macro_ident = Ident::new(
				&format!("__is_std_macro_defined_for_genesis_{}", count),
				genesis_config.genesis_config.span(),
			);

			(genesis_config, def_macro_ident, std_macro_ident)
		} else {
			let def_macro_ident =
				Ident::new(&format!("__is_genesis_config_defined_{}", count), def.item.span());

			let std_macro_ident =
				Ident::new(&format!("__is_std_enabled_for_genesis_{}", count), def.item.span());

			return quote::quote! {
				#[doc(hidden)]
				pub mod __substrate_genesis_config_check {
					#[macro_export]
					#[doc(hidden)]
					macro_rules! #def_macro_ident {
						($pallet_name:ident) => {
							compile_error!(concat!(
								"`",
								stringify!($pallet_name),
								"` does not have #[pallet::genesis_config] defined, perhaps you should \
								remove `Config` from construct_runtime?",
							));
						}
					}

					#[macro_export]
					#[doc(hidden)]
					macro_rules! #std_macro_ident {
						($pallet_name:ident, $pallet_path:expr) => {};
					}

					#[doc(hidden)]
					pub use #def_macro_ident as is_genesis_config_defined;
					#[doc(hidden)]
					pub use #std_macro_ident as is_std_enabled_for_genesis;
				}
			}
		};

	let frame_support = &def.frame_support;

	let genesis_config_item =
		&mut def.item.content.as_mut().expect("Checked by def parser").1[genesis_config.index];

	let serde_crate = format!("{}::serde", frame_support);

	match genesis_config_item {
		syn::Item::Enum(syn::ItemEnum { attrs, .. }) |
		syn::Item::Struct(syn::ItemStruct { attrs, .. }) |
		syn::Item::Type(syn::ItemType { attrs, .. }) => {
			if get_doc_literals(&attrs).is_empty() {
				attrs.push(syn::parse_quote!(
					#[doc = r"
					Can be used to configure the
					[genesis state](https://docs.substrate.io/v3/runtime/chain-specs#the-genesis-state)
					of this pallet.
					"]
				));
			}
			attrs.push(syn::parse_quote!( #[cfg(feature = "std")] ));
			attrs.push(syn::parse_quote!(
				#[derive(#frame_support::Serialize, #frame_support::Deserialize)]
			));
			attrs.push(syn::parse_quote!( #[serde(rename_all = "camelCase")] ));
			attrs.push(syn::parse_quote!( #[serde(deny_unknown_fields)] ));
			attrs.push(syn::parse_quote!( #[serde(bound(serialize = ""))] ));
			attrs.push(syn::parse_quote!( #[serde(bound(deserialize = ""))] ));
			attrs.push(syn::parse_quote!( #[serde(crate = #serde_crate)] ));
		},
		_ => unreachable!("Checked by genesis_config parser"),
	}

	quote::quote! {
		#[doc(hidden)]
		pub mod __substrate_genesis_config_check {
			#[macro_export]
			#[doc(hidden)]
			macro_rules! #def_macro_ident {
				($pallet_name:ident) => {};
			}

			#[cfg(not(feature = "std"))]
			#[macro_export]
			#[doc(hidden)]
			macro_rules! #std_macro_ident {
				($pallet_name:ident, $pallet_path:expr) => {
					compile_error!(concat!(
						"`",
						stringify!($pallet_name),
						"` does not have the std feature enabled, this will cause the `",
						$pallet_path,
						"::GenesisConfig` type to be undefined."
					));
				};
			}

			#[cfg(feature = "std")]
			#[macro_export]
			#[doc(hidden)]
			macro_rules! #std_macro_ident {
				($pallet_name:ident, $pallet_path:expr) => {};
			}

			#[doc(hidden)]
			pub use #def_macro_ident as is_genesis_config_defined;
			#[doc(hidden)]
			pub use #std_macro_ident as is_std_enabled_for_genesis;
		}
	}
}