// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity 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.

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

//! Helpers for submit a POW work.

use std::sync::Arc;

use rlp;
use ethcore::miner::{BlockChainClient, MinerService};
use ethereum_types::{H64 as EthcoreH64, H256 as EthcoreH256};
use jsonrpc_core::Error;
use v1::types::{H64, H256};
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?
	let nonce: EthcoreH64 = nonce.into();
	let pow_hash: EthcoreH256 = pow_hash.into();
	let mix_hash: EthcoreH256 = mix_hash.into();
	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)];
	let import = miner.submit_seal(pow_hash, seal)
		.and_then(|block| client.import_sealed_block(block));
	match import {
		Ok(hash) => {
			Ok(hash.into())
		},
		Err(err) => {
			warn!(target: "miner", "Cannot submit work - {:?}.", err);
			Err(errors::cannot_submit_work(err))
		},
	}
}