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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/>.

//! Helpers for submit a POW work.

use std::sync::Arc;

use ethcore::miner::{BlockChainClient, MinerService};
use ethereum_types::{H256, H64};
use jsonrpc_core::Error;
use rlp;
use v1::helpers::errors;

// Submit a POW work and return the block's hash
pub fn submit_work_detail<C: BlockChainClient, M: MinerService>(
    client: &Arc<C>,
    miner: &Arc<M>,
    nonce: H64,
    pow_hash: H256,
    mix_hash: H256,
) -> Result<H256, Error> {
    // TODO [ToDr] Should disallow submissions in case of PoA?
    trace!(target: "miner", "submit_work_detail: Decoded: nonce={}, pow_hash={}, mix_hash={}", nonce, pow_hash, mix_hash);
    let seal = vec![rlp::encode(&mix_hash), rlp::encode(&nonce)];
    miner
        .submit_seal(pow_hash, seal)
        .and_then(|block| client.import_sealed_block(block))
        .map_err(|e| {
            warn!(target: "miner", "Cannot submit work - {:?}.", e);
            errors::cannot_submit_work(e)
        })
}