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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

// OpenEthereum 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 OpenEthereum.  If not, see <http://www.gnu.org/licenses/>.

use ethereum_types::{H256, U256};

use common_types::{encoded, header::Header, BlockNumber};

/// Contains information on a best block that is specific to the consensus engine.
///
/// For GHOST fork-choice rule it would typically describe the block with highest
/// combined difficulty (usually the block with the highest block number).
///
/// Sometimes refered as 'latest block'.
pub struct BestBlock {
    /// Best block decoded header.
    pub header: Header,
    /// Best block uncompressed bytes.
    pub block: encoded::Block,
    /// Best block total difficulty.
    pub total_difficulty: U256,
}

/// Best ancient block info. If the blockchain has a gap this keeps track of where it starts.
#[derive(Default)]
pub struct BestAncientBlock {
    /// Best block hash.
    pub hash: H256,
    /// Best block number.
    pub number: BlockNumber,
}