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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/>.

//! Blockhain info type definition

use std::fmt;

use crate::{security_level::SecurityLevel, BlockNumber};
use ethereum_types::{H256, U256};

/// Information about the blockchain gathered together.
#[derive(Clone, Debug)]
pub struct BlockChainInfo {
    /// Blockchain difficulty.
    pub total_difficulty: U256,
    /// Block queue difficulty.
    pub pending_total_difficulty: U256,
    /// Genesis block hash.
    pub genesis_hash: H256,
    /// Best blockchain block hash.
    pub best_block_hash: H256,
    /// Best blockchain block number.
    pub best_block_number: BlockNumber,
    /// Best blockchain block timestamp.
    pub best_block_timestamp: u64,
    /// Best ancient block hash.
    pub ancient_block_hash: Option<H256>,
    /// Best ancient block number.
    pub ancient_block_number: Option<BlockNumber>,
    /// First block on the best sequence.
    pub first_block_hash: Option<H256>,
    /// Number of the first block on the best sequence.
    pub first_block_number: Option<BlockNumber>,
}

impl BlockChainInfo {
    /// Determine the security model for the current state.
    pub fn security_level(&self) -> SecurityLevel {
        // TODO: Detect SecurityLevel::FullState : https://github.com/openethereum/openethereum/issues/3834
        if self.ancient_block_number.is_none() || self.first_block_number.is_none() {
            SecurityLevel::FullProofOfWork
        } else {
            SecurityLevel::PartialProofOfWork(
                self.best_block_number
                    - self
                        .first_block_number
                        .expect("Guard condition means this is not none"),
            )
        }
    }
}

impl fmt::Display for BlockChainInfo {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "#{}.{}", self.best_block_number, self.best_block_hash)
    }
}