// 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 serde::{Serialize, Serializer};

/// The result of an `eth_getWork` call: it differs based on an option
/// whether to send the block number.
#[derive(Debug, PartialEq, Eq)]
pub struct Work {
    /// The proof-of-work hash.
    pub pow_hash: H256,
    /// The seed hash.
    pub seed_hash: H256,
    /// The target.
    pub target: H256,
    /// The block number: this isn't always stored.
    pub number: Option<u64>,
}

impl Serialize for Work {
    fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        match self.number.as_ref() {
            Some(num) => (
                &self.pow_hash,
                &self.seed_hash,
                &self.target,
                U256::from(*num),
            )
                .serialize(s),
            None => (&self.pow_hash, &self.seed_hash, &self.target).serialize(s),
        }
    }
}