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// This file is part of Substrate.

// Copyright (C) 2017-2020 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

//! Blockchain access trait

use sp_blockchain::{Error, HeaderBackend, HeaderMetadata};
use sc_client_api::{BlockBackend, ProofProvider};
use sp_runtime::traits::{Block as BlockT, BlockIdTo};

/// Local client abstraction for the network.
pub trait Client<Block: BlockT>: HeaderBackend<Block> + ProofProvider<Block> + BlockIdTo<Block, Error = Error>
	+ BlockBackend<Block> + HeaderMetadata<Block, Error = Error> + Send + Sync
{}

impl<Block: BlockT, T> Client<Block> for T
	where
		T: HeaderBackend<Block> + ProofProvider<Block> + BlockIdTo<Block, Error = Error>
			+ BlockBackend<Block> + HeaderMetadata<Block, Error = Error> + Send + Sync
{}

/// Finality proof provider.
pub trait FinalityProofProvider<Block: BlockT>: Send + Sync {
	/// Prove finality of the block.
	fn prove_finality(&self, for_block: Block::Hash, request: &[u8]) -> Result<Option<Vec<u8>>, Error>;
}

impl<Block: BlockT> FinalityProofProvider<Block> for () {
	fn prove_finality(&self, _for_block: Block::Hash, _request: &[u8]) -> Result<Option<Vec<u8>>, Error> {
		Ok(None)
	}
}