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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/>.

    //! Unsafe Signing RPC implementation.

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

    use ethcore::account_provider::AccountProvider;
    use ethcore::miner::MinerService;
    use ethcore::client::MiningBlockChainClient;

    use futures::{self, BoxFuture, Future};
    use jsonrpc_core::Error;
    use v1::helpers::{errors, dispatch, DefaultAccount};
    use v1::metadata::Metadata;
    use v1::traits::{EthSigning, ParitySigning};
    use v1::types::{
    	U256 as RpcU256,
    	H160 as RpcH160, H256 as RpcH256, H520 as RpcH520, Bytes as RpcBytes,
    	Either as RpcEither,
    	RichRawTransaction as RpcRichRawTransaction,
    	TransactionRequest as RpcTransactionRequest,
    	ConfirmationPayload as RpcConfirmationPayload,
    	ConfirmationResponse as RpcConfirmationResponse,
    };

    /// Implementation of functions that require signing when no trusted signer is used.
    pub struct SigningUnsafeClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {
    	accounts: Weak<AccountProvider>,
    	client: Weak<C>,
    	miner: Weak<M>,
    }

    impl<C, M> SigningUnsafeClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {

    	/// Creates new SigningUnsafeClient.
    	pub fn new(client: &Arc<C>, accounts: &Arc<AccountProvider>, miner: &Arc<M>)
    		-> Self {
    		SigningUnsafeClient {
    			client: Arc::downgrade(client),
    			miner: Arc::downgrade(miner),
    			accounts: Arc::downgrade(accounts),
    		}
    	}

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

    	fn handle(&self, payload: RpcConfirmationPayload, account: DefaultAccount) -> Result<RpcConfirmationResponse, Error> {
    		self.active()?;
    		let client = take_weak!(self.client);
    		let miner = take_weak!(self.miner);
    		let accounts = take_weak!(self.accounts);

    		let default_account = match account {
    			DefaultAccount::Provided(acc) => acc,
    			DefaultAccount::ForDapp(dapp) => accounts.default_address(dapp).ok().unwrap_or_default(),
    		};
    		let payload = dispatch::from_rpc(payload, default_account, &*client, &*miner);
    		dispatch::execute(&*client, &*miner, &*accounts, payload, dispatch::SignWith::Nothing)
    			.map(|v| v.into_value())
    	}
    }

    impl<C: 'static, M: 'static> EthSigning for SigningUnsafeClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {
    	type Metadata = Metadata;

    	fn sign(&self, address: RpcH160, data: RpcBytes) -> BoxFuture<RpcH520, Error> {
    		let result = match self.handle(RpcConfirmationPayload::Signature((address.clone(), data).into()), address.into()) {
    			Ok(RpcConfirmationResponse::Signature(signature)) => Ok(signature),
    			Err(e) => Err(e),
    			e => Err(errors::internal("Unexpected result", e)),
    		};

    		futures::done(result).boxed()
    	}

    	fn send_transaction(&self, meta: Metadata, request: RpcTransactionRequest) -> BoxFuture<RpcH256, Error> {
    		let result = match self.handle(RpcConfirmationPayload::SendTransaction(request), meta.into()) {
    			Ok(RpcConfirmationResponse::SendTransaction(hash)) => Ok(hash),
    			Err(e) => Err(e),
    			e => Err(errors::internal("Unexpected result", e)),
    		};

    		futures::done(result).boxed()
    	}

    	fn sign_transaction(&self, meta: Metadata, request: RpcTransactionRequest) -> BoxFuture<RpcRichRawTransaction, Error> {
    		let result = match self.handle(RpcConfirmationPayload::SignTransaction(request), meta.into()) {
    			Ok(RpcConfirmationResponse::SignTransaction(tx)) => Ok(tx),
    			Err(e) => Err(e),
    			e => Err(errors::internal("Unexpected result", e)),
    		};

    		futures::done(result).boxed()
    	}
    }

    impl<C: 'static, M: 'static> ParitySigning for SigningUnsafeClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {
    	type Metadata = Metadata;

    	fn decrypt_message(&self, address: RpcH160, data: RpcBytes) -> BoxFuture<RpcBytes, Error> {
    		let result = match self.handle(RpcConfirmationPayload::Decrypt((address.clone(), data).into()), address.into()) {
    			Ok(RpcConfirmationResponse::Decrypt(data)) => Ok(data),
    			Err(e) => Err(e),
    			e => Err(errors::internal("Unexpected result", e)),
    		};

    		futures::done(result).boxed()
    	}

    	fn post_sign(&self, _: RpcH160, _: RpcBytes) -> Result<RpcEither<RpcU256, RpcConfirmationResponse>, Error> {
    		// We don't support this in non-signer mode.
    		Err(errors::signer_disabled())
    	}

    	fn post_transaction(&self, _: Metadata, _: RpcTransactionRequest) -> BoxFuture<RpcEither<RpcU256, RpcConfirmationResponse>, Error> {
    		// We don't support this in non-signer mode.
    		futures::done(Err(errors::signer_disabled())).boxed()
    	}

    	fn check_request(&self, _: RpcU256) -> Result<Option<RpcConfirmationResponse>, Error> {
    		// We don't support this in non-signer mode.
    		Err(errors::signer_disabled())
    	}
    }

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