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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/>.

    //! Traces api implementation.

    use std::sync::{Weak, Arc};

    use rlp::{UntrustedRlp, View};
    use ethcore::client::{BlockChainClient, CallAnalytics, TransactionId, TraceId};
    use ethcore::miner::MinerService;
    use ethcore::transaction::{Transaction as EthTransaction, SignedTransaction, Action};

    use jsonrpc_core::Error;
    use jsonrpc_macros::Trailing;
    use v1::traits::Traces;
    use v1::helpers::{errors, CallRequest as CRequest};
    use v1::types::{TraceFilter, LocalizedTrace, BlockNumber, Index, CallRequest, Bytes, TraceResults, H256};

    fn to_call_analytics(flags: Vec<String>) -> CallAnalytics {
    	CallAnalytics {
    		transaction_tracing: flags.contains(&("trace".to_owned())),
    		vm_tracing: flags.contains(&("vmTrace".to_owned())),
    		state_diffing: flags.contains(&("stateDiff".to_owned())),
    	}
    }

    /// Traces api implementation.
    pub struct TracesClient<C, M> where C: BlockChainClient, M: MinerService {
    	client: Weak<C>,
    	miner: Weak<M>,
    }

    impl<C, M> TracesClient<C, M> where C: BlockChainClient, M: MinerService {
    	/// Creates new Traces client.
    	pub fn new(client: &Arc<C>, miner: &Arc<M>) -> Self {
    		TracesClient {
    			client: Arc::downgrade(client),
    			miner: Arc::downgrade(miner),
    		}
    	}

    	// TODO: share with eth.rs
    	fn sign_call(&self, request: CRequest) -> Result<SignedTransaction, Error> {
    		let client = take_weak!(self.client);
    		let miner = take_weak!(self.miner);
    		let from = request.from.unwrap_or(0.into());
    		Ok(EthTransaction {
    			nonce: request.nonce.unwrap_or_else(|| client.latest_nonce(&from)),
    			action: request.to.map_or(Action::Create, Action::Call),
    			gas: request.gas.unwrap_or(50_000_000.into()),
    			gas_price: request.gas_price.unwrap_or_else(|| miner.sensible_gas_price()),
    			value: request.value.unwrap_or(0.into()),
    			data: request.data.map_or_else(Vec::new, |d| d.to_vec())
    		}.fake_sign(from))
    	}

    	fn active(&self) -> Result<(), Error> {
    		// TODO: only call every 30s at most.
    		take_weak!(self.client).keep_alive();
    		Ok(())
    	}
    }

    impl<C, M> Traces for TracesClient<C, M> where C: BlockChainClient + 'static, M: MinerService + 'static {
    	fn filter(&self, filter: TraceFilter) -> Result<Vec<LocalizedTrace>, Error> {
    		self.active()?;
    		let client = take_weak!(self.client);
    		let traces = client.filter_traces(filter.into());
    		let traces = traces.map_or_else(Vec::new, |traces| traces.into_iter().map(LocalizedTrace::from).collect());
    		Ok(traces)
    	}

    	fn block_traces(&self, block_number: BlockNumber) -> Result<Vec<LocalizedTrace>, Error> {
    		self.active()?;
    		let client = take_weak!(self.client);
    		let traces = client.block_traces(block_number.into());
    		let traces = traces.map_or_else(Vec::new, |traces| traces.into_iter().map(LocalizedTrace::from).collect());
    		Ok(traces)
    	}

    	fn transaction_traces(&self, transaction_hash: H256) -> Result<Vec<LocalizedTrace>, Error> {
    		self.active()?;
    		let client = take_weak!(self.client);
    		let traces = client.transaction_traces(TransactionId::Hash(transaction_hash.into()));
    		let traces = traces.map_or_else(Vec::new, |traces| traces.into_iter().map(LocalizedTrace::from).collect());
    		Ok(traces)
    	}

    	fn trace(&self, transaction_hash: H256, address: Vec<Index>) -> Result<Option<LocalizedTrace>, Error> {
    		self.active()?;
    		let client = take_weak!(self.client);
    		let id = TraceId {
    			transaction: TransactionId::Hash(transaction_hash.into()),
    			address: address.into_iter().map(|i| i.value()).collect()
    		};
    		let trace = client.trace(id);
    		let trace = trace.map(LocalizedTrace::from);

    		Ok(trace)
    	}

    	fn call(&self, request: CallRequest, flags: Vec<String>, block: Trailing<BlockNumber>) -> Result<Option<TraceResults>, Error> {
    		self.active()?;
    		let block = block.0;

    		let request = CallRequest::into(request);
    		let signed = self.sign_call(request)?;
    		Ok(match take_weak!(self.client).call(&signed, block.into(), to_call_analytics(flags)) {
    			Ok(e) => Some(TraceResults::from(e)),
    			_ => None,
    		})
    	}

    	fn raw_transaction(&self, raw_transaction: Bytes, flags: Vec<String>, block: Trailing<BlockNumber>) -> Result<Option<TraceResults>, Error> {
    		self.active()?;
    		let block = block.0;

    		UntrustedRlp::new(&raw_transaction.into_vec()).as_val()
    			.map_err(|e| errors::invalid_params("Transaction is not valid RLP", e))
    			.and_then(|tx| SignedTransaction::new(tx).map_err(errors::from_transaction_error))
    			.and_then(|signed| {
    				Ok(match take_weak!(self.client).call(&signed, block.into(), to_call_analytics(flags)) {
    					Ok(e) => Some(TraceResults::from(e)),
    					_ => None,
    				})
    			})
    	}

    	fn replay_transaction(&self, transaction_hash: H256, flags: Vec<String>) -> Result<Option<TraceResults>, Error> {
    		self.active()?;

    		Ok(match take_weak!(self.client).replay(TransactionId::Hash(transaction_hash.into()), to_call_analytics(flags)) {
    			Ok(e) => Some(TraceResults::from(e)),
    			_ => None,
    		})
    	}
    }

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