// This file is part of Substrate.

// Copyright (C) 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.

//! Helper functions for implementing [`sp_genesis_builder::GenesisBuilder`] for runtimes.
//!
//! Provides common logic. For more info refer to [`sp_genesis_builder::GenesisBuilder`].

use frame_support::traits::BuildGenesisConfig;
use sp_genesis_builder::Result as BuildResult;
use sp_runtime::format_runtime_string;

/// Get the default `GenesisConfig` as a JSON blob. For more info refer to
/// [`sp_genesis_builder::GenesisBuilder::create_default_config`]
pub fn create_default_config<GC>() -> sp_std::vec::Vec<u8>
where
	GC: BuildGenesisConfig + Default,
{
	serde_json::to_string(&GC::default())
		.expect("serialization to json is expected to work. qed.")
		.into_bytes()
}

/// Build `GenesisConfig` from a JSON blob not using any defaults and store it in the storage. For
/// more info refer to [`sp_genesis_builder::GenesisBuilder::build_config`].
pub fn build_config<GC: BuildGenesisConfig>(json: sp_std::vec::Vec<u8>) -> BuildResult {
	let gc = serde_json::from_slice::<GC>(&json)
		.map_err(|e| format_runtime_string!("Invalid JSON blob: {}", e))?;
	<GC as BuildGenesisConfig>::build(&gc);
	Ok(())
}