// This file is part of Substrate.

// Copyright (C) 2019-2020 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.

//! The block builder runtime api.

#![cfg_attr(not(feature = "std"), no_std)]

use sp_runtime::{traits::Block as BlockT, ApplyExtrinsicResult};

use sp_inherents::{InherentData, CheckInherentsResult};

sp_api::decl_runtime_apis! {
	/// The `BlockBuilder` api trait that provides the required functionality for building a block.
	#[api_version(4)]
	pub trait BlockBuilder {
		/// Apply the given extrinsic.
		///
		/// Returns an inclusion outcome which specifies if this extrinsic is included in
		/// this block or not.
		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyExtrinsicResult;
		/// Finish the current block.
		#[renamed("finalise_block", 3)]
		fn finalize_block() -> <Block as BlockT>::Header;
		/// Generate inherent extrinsics. The inherent data will vary from chain to chain.
		fn inherent_extrinsics(
			inherent: InherentData,
		) -> sp_std::vec::Vec<<Block as BlockT>::Extrinsic>;
		/// Check that the inherents are valid. The inherent data will vary from chain to chain.
		fn check_inherents(block: Block, data: InherentData) -> CheckInherentsResult;
		/// Generate a random seed.
		fn random_seed() -> <Block as BlockT>::Hash;
	}
}
