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    // Copyright 2015-2017 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/>.

    //! Test client.

    use std::sync::atomic::{AtomicUsize, Ordering as AtomicOrder};
    use util::*;
    use rlp::*;
    use ethkey::{Generator, Random};
    use devtools::*;
    use transaction::{Transaction, LocalizedTransaction, PendingTransaction, SignedTransaction, Action};
    use blockchain::TreeRoute;
    use client::{
    	BlockChainClient, MiningBlockChainClient, EngineClient, BlockChainInfo, BlockStatus, BlockId,
    	TransactionId, UncleId, TraceId, TraceFilter, LastHashes, CallAnalytics, BlockImportError,
    	ProvingBlockChainClient,
    };
    use db::{NUM_COLUMNS, COL_STATE};
    use header::{Header as BlockHeader, BlockNumber};
    use filter::Filter;
    use log_entry::LocalizedLogEntry;
    use receipt::{Receipt, LocalizedReceipt};
    use blockchain::extras::BlockReceipts;
    use error::{ImportResult, Error as EthcoreError};
    use evm::{Factory as EvmFactory, VMType, Schedule};
    use miner::{Miner, MinerService, TransactionImportResult};
    use spec::Spec;
    use types::mode::Mode;
    use types::pruning_info::PruningInfo;

    use verification::queue::QueueInfo;
    use block::{OpenBlock, SealedBlock};
    use executive::Executed;
    use error::CallError;
    use trace::LocalizedTrace;
    use state_db::StateDB;
    use encoded;

    /// Test client.
    pub struct TestBlockChainClient {
    	/// Blocks.
    	pub blocks: RwLock<HashMap<H256, Bytes>>,
    	/// Mapping of numbers to hashes.
     	pub numbers: RwLock<HashMap<usize, H256>>,
    	/// Genesis block hash.
    	pub genesis_hash: H256,
    	/// Last block hash.
    	pub last_hash: RwLock<H256>,
    	/// Extra data do set for each block
    	pub extra_data: Bytes,
    	/// Difficulty.
    	pub difficulty: RwLock<U256>,
    	/// Balances.
    	pub balances: RwLock<HashMap<Address, U256>>,
    	/// Nonces.
    	pub nonces: RwLock<HashMap<Address, U256>>,
    	/// Storage.
    	pub storage: RwLock<HashMap<(Address, H256), H256>>,
    	/// Code.
    	pub code: RwLock<HashMap<Address, Bytes>>,
    	/// Execution result.
    	pub execution_result: RwLock<Option<Result<Executed, CallError>>>,
    	/// Transaction receipts.
    	pub receipts: RwLock<HashMap<TransactionId, LocalizedReceipt>>,
    	/// Logs
    	pub logs: RwLock<Vec<LocalizedLogEntry>>,
    	/// Block queue size.
    	pub queue_size: AtomicUsize,
    	/// Miner
    	pub miner: Arc<Miner>,
    	/// Spec
    	pub spec: Spec,
    	/// VM Factory
    	pub vm_factory: EvmFactory,
    	/// Timestamp assigned to latest sealed block
    	pub latest_block_timestamp: RwLock<u64>,
    	/// Ancient block info.
    	pub ancient_block: RwLock<Option<(H256, u64)>>,
    	/// First block info.
    	pub first_block: RwLock<Option<(H256, u64)>>,
    	/// Traces to return
    	pub traces: RwLock<Option<Vec<LocalizedTrace>>>,
    	/// Pruning history size to report.
    	pub history: RwLock<Option<u64>>,
    }

    /// Used for generating test client blocks.
    #[derive(Clone)]
    pub enum EachBlockWith {
    	/// Plain block.
    	Nothing,
    	/// Block with an uncle.
    	Uncle,
    	/// Block with a transaction.
    	Transaction,
    	/// Block with an uncle and transaction.
    	UncleAndTransaction
    }

    impl Default for TestBlockChainClient {
    	fn default() -> Self {
    		TestBlockChainClient::new()
    	}
    }

    impl TestBlockChainClient {
    	/// Creates new test client.
    	pub fn new() -> Self {
    		Self::new_with_extra_data(Bytes::new())
    	}

    	/// Creates new test client with specified extra data for each block
    	pub fn new_with_extra_data(extra_data: Bytes) -> Self {
    		let spec = Spec::new_test();
    		TestBlockChainClient::new_with_spec_and_extra(spec, extra_data)
    	}

    	/// Create test client with custom spec.
    	pub fn new_with_spec(spec: Spec) -> Self {
    		TestBlockChainClient::new_with_spec_and_extra(spec, Bytes::new())
    	}

    	/// Create test client with custom spec and extra data.
    	pub fn new_with_spec_and_extra(spec: Spec, extra_data: Bytes) -> Self {
    		let genesis_block = spec.genesis_block();
    		let genesis_hash = spec.genesis_header().hash();

    		let mut client = TestBlockChainClient {
    			blocks: RwLock::new(HashMap::new()),
    			numbers: RwLock::new(HashMap::new()),
    			genesis_hash: H256::new(),
    			extra_data: extra_data,
    			last_hash: RwLock::new(H256::new()),
    			difficulty: RwLock::new(spec.genesis_header().difficulty().clone()),
    			balances: RwLock::new(HashMap::new()),
    			nonces: RwLock::new(HashMap::new()),
    			storage: RwLock::new(HashMap::new()),
    			code: RwLock::new(HashMap::new()),
    			execution_result: RwLock::new(None),
    			receipts: RwLock::new(HashMap::new()),
    			logs: RwLock::new(Vec::new()),
    			queue_size: AtomicUsize::new(0),
    			miner: Arc::new(Miner::with_spec(&spec)),
    			spec: spec,
    			vm_factory: EvmFactory::new(VMType::Interpreter, 1024 * 1024),
    			latest_block_timestamp: RwLock::new(10_000_000),
    			ancient_block: RwLock::new(None),
    			first_block: RwLock::new(None),
    			traces: RwLock::new(None),
    			history: RwLock::new(None),
    		};

    		// insert genesis hash.
    		client.blocks.get_mut().insert(genesis_hash, genesis_block);
    		client.numbers.get_mut().insert(0, genesis_hash);
    		*client.last_hash.get_mut() = genesis_hash;
    		client.genesis_hash = genesis_hash;
    		client
    	}

    	/// Set the transaction receipt result
    	pub fn set_transaction_receipt(&self, id: TransactionId, receipt: LocalizedReceipt) {
    		self.receipts.write().insert(id, receipt);
    	}

    	/// Set the execution result.
    	pub fn set_execution_result(&self, result: Result<Executed, CallError>) {
    		*self.execution_result.write() = Some(result);
    	}

    	/// Set the balance of account `address` to `balance`.
    	pub fn set_balance(&self, address: Address, balance: U256) {
    		self.balances.write().insert(address, balance);
    	}

    	/// Set nonce of account `address` to `nonce`.
    	pub fn set_nonce(&self, address: Address, nonce: U256) {
    		self.nonces.write().insert(address, nonce);
    	}

    	/// Set `code` at `address`.
    	pub fn set_code(&self, address: Address, code: Bytes) {
    		self.code.write().insert(address, code);
    	}

    	/// Set storage `position` to `value` for account `address`.
    	pub fn set_storage(&self, address: Address, position: H256, value: H256) {
    		self.storage.write().insert((address, position), value);
    	}

    	/// Set block queue size for testing
    	pub fn set_queue_size(&self, size: usize) {
    		self.queue_size.store(size, AtomicOrder::Relaxed);
    	}

    	/// Set timestamp assigned to latest sealed block
    	pub fn set_latest_block_timestamp(&self, ts: u64) {
    		*self.latest_block_timestamp.write() = ts;
    	}

    	/// Set logs to return for each logs call.
    	pub fn set_logs(&self, logs: Vec<LocalizedLogEntry>) {
    		*self.logs.write() = logs;
    	}

    	/// Add blocks to test client.
    	pub fn add_blocks(&self, count: usize, with: EachBlockWith) {
    		let len = self.numbers.read().len();
    		for n in len..(len + count) {
    			let mut header = BlockHeader::new();
    			header.set_difficulty(From::from(n));
    			header.set_parent_hash(self.last_hash.read().clone());
    			header.set_number(n as BlockNumber);
    			header.set_gas_limit(U256::from(1_000_000));
    			header.set_extra_data(self.extra_data.clone());
    			let uncles = match with {
    				EachBlockWith::Uncle | EachBlockWith::UncleAndTransaction => {
    					let mut uncles = RlpStream::new_list(1);
    					let mut uncle_header = BlockHeader::new();
    					uncle_header.set_difficulty(From::from(n));
    					uncle_header.set_parent_hash(self.last_hash.read().clone());
    					uncle_header.set_number(n as BlockNumber);
    					uncles.append(&uncle_header);
    					header.set_uncles_hash(uncles.as_raw().sha3());
    					uncles
    				},
    				_ => RlpStream::new_list(0)
    			};
    			let txs = match with {
    				EachBlockWith::Transaction | EachBlockWith::UncleAndTransaction => {
    					let mut txs = RlpStream::new_list(1);
    					let keypair = Random.generate().unwrap();
    					// Update nonces value
    					self.nonces.write().insert(keypair.address(), U256::one());
    					let tx = Transaction {
    						action: Action::Create,
    						value: U256::from(100),
    						data: "3331600055".from_hex().unwrap(),
    						gas: U256::from(100_000),
    						gas_price: U256::from(200_000_000_000u64),
    						nonce: U256::zero()
    					};
    					let signed_tx = tx.sign(keypair.secret(), None);
    					txs.append(&signed_tx);
    					txs.out()
    				},
    				_ => ::rlp::EMPTY_LIST_RLP.to_vec()
    			};

    			let mut rlp = RlpStream::new_list(3);
    			rlp.append(&header);
    			rlp.append_raw(&txs, 1);
    			rlp.append_raw(uncles.as_raw(), 1);
    			self.import_block(rlp.as_raw().to_vec()).unwrap();
    		}
    	}

    	/// Make a bad block by setting invalid extra data.
    	pub fn corrupt_block(&self, n: BlockNumber) {
    		let hash = self.block_hash(BlockId::Number(n)).unwrap();
    		let mut header: BlockHeader = self.block_header(BlockId::Number(n)).unwrap().decode();
    		header.set_extra_data(b"This extra data is way too long to be considered valid".to_vec());
    		let mut rlp = RlpStream::new_list(3);
    		rlp.append(&header);
    		rlp.append_raw(&::rlp::NULL_RLP, 1);
    		rlp.append_raw(&::rlp::NULL_RLP, 1);
    		self.blocks.write().insert(hash, rlp.out());
    	}

    	/// Make a bad block by setting invalid parent hash.
    	pub fn corrupt_block_parent(&self, n: BlockNumber) {
    		let hash = self.block_hash(BlockId::Number(n)).unwrap();
    		let mut header: BlockHeader = self.block_header(BlockId::Number(n)).unwrap().decode();
    		header.set_parent_hash(H256::from(42));
    		let mut rlp = RlpStream::new_list(3);
    		rlp.append(&header);
    		rlp.append_raw(&::rlp::NULL_RLP, 1);
    		rlp.append_raw(&::rlp::NULL_RLP, 1);
    		self.blocks.write().insert(hash, rlp.out());
    	}

    	/// TODO:
    	pub fn block_hash_delta_minus(&mut self, delta: usize) -> H256 {
    		let blocks_read = self.numbers.read();
    		let index = blocks_read.len() - delta;
    		blocks_read[&index].clone()
    	}

    	fn block_hash(&self, id: BlockId) -> Option<H256> {
    		match id {
    			BlockId::Hash(hash) => Some(hash),
    			BlockId::Number(n) => self.numbers.read().get(&(n as usize)).cloned(),
    			BlockId::Earliest => self.numbers.read().get(&0).cloned(),
    			BlockId::Latest | BlockId::Pending => self.numbers.read().get(&(self.numbers.read().len() - 1)).cloned()
    		}
    	}

    	/// Inserts a transaction with given gas price to miners transactions queue.
    	pub fn insert_transaction_with_gas_price_to_queue(&self, gas_price: U256) -> H256 {
    		let keypair = Random.generate().unwrap();
    		let tx = Transaction {
    			action: Action::Create,
    			value: U256::from(100),
    			data: "3331600055".from_hex().unwrap(),
    			gas: U256::from(100_000),
    			gas_price: gas_price,
    			nonce: U256::zero()
    		};
    		let signed_tx = tx.sign(keypair.secret(), None);
    		self.set_balance(signed_tx.sender(), 10_000_000_000_000_000_000u64.into());
    		let hash = signed_tx.hash();
    		let res = self.miner.import_external_transactions(self, vec![signed_tx.into()]);
    		let res = res.into_iter().next().unwrap().expect("Successful import");
    		assert_eq!(res, TransactionImportResult::Current);
    		hash
    	}

    	/// Inserts a transaction to miners transactions queue.
    	pub fn insert_transaction_to_queue(&self) -> H256 {
    		self.insert_transaction_with_gas_price_to_queue(U256::from(20_000_000_000u64))
    	}

    	/// Set reported history size.
    	pub fn set_history(&self, h: Option<u64>) {
    		*self.history.write() = h;
    	}
    }

    pub fn get_temp_state_db() -> GuardedTempResult<StateDB> {
    	let temp = RandomTempPath::new();
    	let db = Database::open(&DatabaseConfig::with_columns(NUM_COLUMNS), temp.as_str()).unwrap();
    	let journal_db = journaldb::new(Arc::new(db), journaldb::Algorithm::EarlyMerge, COL_STATE);
    	let state_db = StateDB::new(journal_db, 1024 * 1024);
    	GuardedTempResult {
    		_temp: temp,
    		result: Some(state_db)
    	}
    }

    impl MiningBlockChainClient for TestBlockChainClient {
    	fn latest_schedule(&self) -> Schedule {
    		Schedule::new_post_eip150(24576, true, true, true)
    	}

    	fn prepare_open_block(&self, author: Address, gas_range_target: (U256, U256), extra_data: Bytes) -> OpenBlock {
    		let engine = &*self.spec.engine;
    		let genesis_header = self.spec.genesis_header();
    		let mut db_result = get_temp_state_db();
    		let db = self.spec.ensure_db_good(db_result.take(), &Default::default()).unwrap();

    		let last_hashes = vec![genesis_header.hash()];
    		let mut open_block = OpenBlock::new(
    			engine,
    			Default::default(),
    			false,
    			db,
    			&genesis_header,
    			Arc::new(last_hashes),
    			author,
    			gas_range_target,
    			extra_data
    		).expect("Opening block for tests will not fail.");
    		// TODO [todr] Override timestamp for predictability (set_timestamp_now kind of sucks)
    		open_block.set_timestamp(*self.latest_block_timestamp.read());
    		open_block
    	}

    	fn vm_factory(&self) -> &EvmFactory {
    		&self.vm_factory
    	}

    	fn import_sealed_block(&self, _block: SealedBlock) -> ImportResult {
    		Ok(H256::default())
    	}

    	fn broadcast_proposal_block(&self, _block: SealedBlock) {}
    }

    impl BlockChainClient for TestBlockChainClient {
    	fn call(&self, _t: &SignedTransaction, _block: BlockId, _analytics: CallAnalytics) -> Result<Executed, CallError> {
    		self.execution_result.read().clone().unwrap()
    	}

    	fn estimate_gas(&self, _t: &SignedTransaction, _block: BlockId) -> Result<U256, CallError> {
    		Ok(21000.into())
    	}

    	fn replay(&self, _id: TransactionId, _analytics: CallAnalytics) -> Result<Executed, CallError> {
    		self.execution_result.read().clone().unwrap()
    	}

    	fn block_total_difficulty(&self, _id: BlockId) -> Option<U256> {
    		Some(U256::zero())
    	}

    	fn block_hash(&self, id: BlockId) -> Option<H256> {
    		Self::block_hash(self, id)
    	}

    	fn nonce(&self, address: &Address, id: BlockId) -> Option<U256> {
    		match id {
    			BlockId::Latest => Some(self.nonces.read().get(address).cloned().unwrap_or(self.spec.params.account_start_nonce)),
    			_ => None,
    		}
    	}

    	fn storage_root(&self, _address: &Address, _id: BlockId) -> Option<H256> {
    		None
    	}

    	fn latest_nonce(&self, address: &Address) -> U256 {
    		self.nonce(address, BlockId::Latest).unwrap()
    	}

    	fn code(&self, address: &Address, id: BlockId) -> Option<Option<Bytes>> {
    		match id {
    			BlockId::Latest => Some(self.code.read().get(address).cloned()),
    			_ => None,
    		}
    	}

    	fn balance(&self, address: &Address, id: BlockId) -> Option<U256> {
    		if let BlockId::Latest = id {
    			Some(self.balances.read().get(address).cloned().unwrap_or_else(U256::zero))
    		} else {
    			None
    		}
    	}

    	fn latest_balance(&self, address: &Address) -> U256 {
    		self.balance(address, BlockId::Latest).unwrap()
    	}

    	fn storage_at(&self, address: &Address, position: &H256, id: BlockId) -> Option<H256> {
    		if let BlockId::Latest = id {
    			Some(self.storage.read().get(&(address.clone(), position.clone())).cloned().unwrap_or_else(H256::new))
    		} else {
    			None
    		}
    	}

    	fn list_accounts(&self, _id: BlockId, _after: Option<&Address>, _count: u64) -> Option<Vec<Address>> {
    		None
    	}

    	fn list_storage(&self, _id: BlockId, _account: &Address, _after: Option<&H256>, _count: u64) -> Option<Vec<H256>> {
    		None
    	}
    	fn transaction(&self, _id: TransactionId) -> Option<LocalizedTransaction> {
    		None	// Simple default.
    	}

    	fn transaction_block(&self, _id: TransactionId) -> Option<H256> {
    		None	// Simple default.
    	}

    	fn uncle(&self, _id: UncleId) -> Option<encoded::Header> {
    		None	// Simple default.
    	}

    	fn uncle_extra_info(&self, _id: UncleId) -> Option<BTreeMap<String, String>> {
    		None
    	}

    	fn transaction_receipt(&self, id: TransactionId) -> Option<LocalizedReceipt> {
    		self.receipts.read().get(&id).cloned()
    	}

    	fn blocks_with_bloom(&self, _bloom: &H2048, _from_block: BlockId, _to_block: BlockId) -> Option<Vec<BlockNumber>> {
    		unimplemented!();
    	}

    	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry> {
    		let mut logs = self.logs.read().clone();
    		let len = logs.len();
    		match filter.limit {
    			Some(limit) if limit <= len => logs.split_off(len - limit),
    			_ => logs,
    		}
    	}

    	fn last_hashes(&self) -> LastHashes {
    		unimplemented!();
    	}

    	fn best_block_header(&self) -> encoded::Header {
    		self.block_header(BlockId::Hash(self.chain_info().best_block_hash))
    			.expect("Best block always has header.")
    	}

    	fn block_header(&self, id: BlockId) -> Option<encoded::Header> {
    		self.block_hash(id)
    			.and_then(|hash| self.blocks.read().get(&hash).map(|r| Rlp::new(r).at(0).as_raw().to_vec()))
    			.map(encoded::Header::new)
    	}

    	fn block_number(&self, _id: BlockId) -> Option<BlockNumber> {
    		unimplemented!()
    	}

    	fn block_body(&self, id: BlockId) -> Option<encoded::Body> {
    		self.block_hash(id).and_then(|hash| self.blocks.read().get(&hash).map(|r| {
    			let mut stream = RlpStream::new_list(2);
    			stream.append_raw(Rlp::new(r).at(1).as_raw(), 1);
    			stream.append_raw(Rlp::new(r).at(2).as_raw(), 1);
    			encoded::Body::new(stream.out())
    		}))
    	}

    	fn block(&self, id: BlockId) -> Option<encoded::Block> {
    		self.block_hash(id)
    			.and_then(|hash| self.blocks.read().get(&hash).cloned())
    			.map(encoded::Block::new)
    	}

    	fn block_extra_info(&self, id: BlockId) -> Option<BTreeMap<String, String>> {
    		self.block(id)
    			.map(|block| block.view().header())
    			.map(|header| self.spec.engine.extra_info(&header))
    	}

    	fn block_status(&self, id: BlockId) -> BlockStatus {
    		match id {
    			BlockId::Number(number) if (number as usize) < self.blocks.read().len() => BlockStatus::InChain,
    			BlockId::Hash(ref hash) if self.blocks.read().get(hash).is_some() => BlockStatus::InChain,
    			BlockId::Latest | BlockId::Pending | BlockId::Earliest => BlockStatus::InChain,
    			_ => BlockStatus::Unknown,
    		}
    	}

    	// works only if blocks are one after another 1 -> 2 -> 3
    	fn tree_route(&self, from: &H256, to: &H256) -> Option<TreeRoute> {
    		Some(TreeRoute {
    			ancestor: H256::new(),
    			index: 0,
    			blocks: {
    				let numbers_read = self.numbers.read();
    				let mut adding = false;

    				let mut blocks = Vec::new();
    				for (_, hash) in numbers_read.iter().sort_by(|tuple1, tuple2| tuple1.0.cmp(tuple2.0)) {
    					if hash == to {
    						if adding {
    							blocks.push(hash.clone());
    						}
    						adding = false;
    						break;
    					}
    					if hash == from {
    						adding = true;
    					}
    					if adding {
    						blocks.push(hash.clone());
    					}
    				}
    				if adding { Vec::new() } else { blocks }
    			}
    		})
    	}

    	fn find_uncles(&self, _hash: &H256) -> Option<Vec<H256>> {
    		None
    	}

    	// TODO: returns just hashes instead of node state rlp(?)
    	fn state_data(&self, hash: &H256) -> Option<Bytes> {
    		// starts with 'f' ?
    		if *hash > H256::from("f000000000000000000000000000000000000000000000000000000000000000") {
    			let mut rlp = RlpStream::new();
    			rlp.append(&hash.clone());
    			return Some(rlp.out());
    		}
    		None
    	}

    	fn block_receipts(&self, hash: &H256) -> Option<Bytes> {
    		// starts with 'f' ?
    		if *hash > H256::from("f000000000000000000000000000000000000000000000000000000000000000") {
    			let receipt = BlockReceipts::new(vec![Receipt::new(
    				Some(H256::zero()),
    				U256::zero(),
    				vec![])]);
    			let mut rlp = RlpStream::new();
    			rlp.append(&receipt);
    			return Some(rlp.out());
    		}
    		None
    	}

    	fn import_block(&self, b: Bytes) -> Result<H256, BlockImportError> {
    		let header = Rlp::new(&b).val_at::<BlockHeader>(0);
    		let h = header.hash();
    		let number: usize = header.number() as usize;
    		if number > self.blocks.read().len() {
    			panic!("Unexpected block number. Expected {}, got {}", self.blocks.read().len(), number);
    		}
    		if number > 0 {
    			match self.blocks.read().get(header.parent_hash()) {
    				Some(parent) => {
    					let parent = Rlp::new(parent).val_at::<BlockHeader>(0);
    					if parent.number() != (header.number() - 1) {
    						panic!("Unexpected block parent");
    					}
    				},
    				None => {
    					panic!("Unknown block parent {:?} for block {}", header.parent_hash(), number);
    				}
    			}
    		}
    		let len = self.numbers.read().len();
    		if number == len {
    			{
    				let mut difficulty = self.difficulty.write();
    				*difficulty = *difficulty + header.difficulty().clone();
    			}
    			mem::replace(&mut *self.last_hash.write(), h.clone());
    			self.blocks.write().insert(h.clone(), b);
    			self.numbers.write().insert(number, h.clone());
    			let mut parent_hash = header.parent_hash().clone();
    			if number > 0 {
    				let mut n = number - 1;
    				while n > 0 && self.numbers.read()[&n] != parent_hash {
    					*self.numbers.write().get_mut(&n).unwrap() = parent_hash.clone();
    					n -= 1;
    					parent_hash = Rlp::new(&self.blocks.read()[&parent_hash]).val_at::<BlockHeader>(0).parent_hash().clone();
    				}
    			}
    		}
    		else {
    			self.blocks.write().insert(h.clone(), b.to_vec());
    		}
    		Ok(h)
    	}

    	fn import_block_with_receipts(&self, b: Bytes, _r: Bytes) -> Result<H256, BlockImportError> {
    		self.import_block(b)
    	}

    	fn queue_info(&self) -> QueueInfo {
    		QueueInfo {
    			verified_queue_size: self.queue_size.load(AtomicOrder::Relaxed),
    			unverified_queue_size: 0,
    			verifying_queue_size: 0,
    			max_queue_size: 0,
    			max_mem_use: 0,
    			mem_used: 0,
    		}
    	}

    	fn clear_queue(&self) {
    	}

    	fn additional_params(&self) -> BTreeMap<String, String> {
    		Default::default()
    	}

    	fn chain_info(&self) -> BlockChainInfo {
    		BlockChainInfo {
    			total_difficulty: *self.difficulty.read(),
    			pending_total_difficulty: *self.difficulty.read(),
    			genesis_hash: self.genesis_hash.clone(),
    			best_block_hash: self.last_hash.read().clone(),
    			best_block_number: self.blocks.read().len() as BlockNumber - 1,
    			first_block_hash: self.first_block.read().as_ref().map(|x| x.0),
    			first_block_number: self.first_block.read().as_ref().map(|x| x.1),
    			ancient_block_hash: self.ancient_block.read().as_ref().map(|x| x.0),
    			ancient_block_number: self.ancient_block.read().as_ref().map(|x| x.1)
    		}
    	}

    	fn filter_traces(&self, _filter: TraceFilter) -> Option<Vec<LocalizedTrace>> {
    		self.traces.read().clone()
    	}

    	fn trace(&self, _trace: TraceId) -> Option<LocalizedTrace> {
    		self.traces.read().clone().and_then(|vec| vec.into_iter().next())
    	}

    	fn transaction_traces(&self, _trace: TransactionId) -> Option<Vec<LocalizedTrace>> {
    		self.traces.read().clone()
    	}

    	fn block_traces(&self, _trace: BlockId) -> Option<Vec<LocalizedTrace>> {
    		self.traces.read().clone()
    	}

    	fn queue_transactions(&self, transactions: Vec<Bytes>, _peer_id: usize) {
    		// import right here
    		let txs = transactions.into_iter().filter_map(|bytes| UntrustedRlp::new(&bytes).as_val().ok()).collect();
    		self.miner.import_external_transactions(self, txs);
    	}

    	fn queue_consensus_message(&self, message: Bytes) {
    		self.spec.engine.handle_message(&message).unwrap();
    	}

    	fn ready_transactions(&self) -> Vec<PendingTransaction> {
    		self.miner.ready_transactions(self.chain_info().best_block_number)
    	}

    	fn signing_network_id(&self) -> Option<u64> { None }

    	fn mode(&self) -> Mode { Mode::Active }

    	fn set_mode(&self, _: Mode) { unimplemented!(); }

    	fn disable(&self) { unimplemented!(); }

    	fn pruning_info(&self) -> PruningInfo {
    		let best_num = self.chain_info().best_block_number;
    		PruningInfo {
    			earliest_chain: 1,
    			earliest_state: self.history.read().as_ref().map(|x| best_num - x).unwrap_or(0),
    		}
    	}

    	fn call_contract(&self, _address: Address, _data: Bytes) -> Result<Bytes, String> { Ok(vec![]) }

    	fn transact_contract(&self, address: Address, data: Bytes) -> Result<TransactionImportResult, EthcoreError> {
    		let transaction = Transaction {
    			nonce: self.latest_nonce(&self.miner.author()),
    			action: Action::Call(address),
    			gas: self.spec.gas_limit,
    			gas_price: U256::zero(),
    			value: U256::default(),
    			data: data,
    		};
    		let network_id = Some(self.spec.params.network_id);
    		let sig = self.spec.engine.sign(transaction.hash(network_id)).unwrap();
    		let signed = SignedTransaction::new(transaction.with_signature(sig, network_id)).unwrap();
    		self.miner.import_own_transaction(self, signed.into())
    	}

    	fn registrar_address(&self) -> Option<Address> { None }

    	fn registry_address(&self, _name: String) -> Option<Address> { None }
    }

    impl ProvingBlockChainClient for TestBlockChainClient {
    	fn prove_storage(&self, _: H256, _: H256, _: u32, _: BlockId) -> Vec<Bytes> {
    		Vec::new()
    	}

    	fn prove_account(&self, _: H256, _: u32, _: BlockId) -> Vec<Bytes> {
    		Vec::new()
    	}

    	fn code_by_hash(&self, _: H256, _: BlockId) -> Bytes {
    		Vec::new()
    	}
    }

    impl EngineClient for TestBlockChainClient {
    	fn update_sealing(&self) {
    		self.miner.update_sealing(self)
    	}

    	fn submit_seal(&self, block_hash: H256, seal: Vec<Bytes>) {
    		if self.miner.submit_seal(self, block_hash, seal).is_err() {
    			warn!(target: "poa", "Wrong internal seal submission!")
    		}
    	}

    	fn broadcast_consensus_message(&self, _message: Bytes) {}
    }

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