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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/>.

    //! Account management (personal) rpc implementation
    use std::sync::{Arc, Weak};

    use ethcore::account_provider::AccountProvider;
    use ethcore::client::MiningBlockChainClient;
    use ethcore::miner::MinerService;
    use util::{Address, U128, Uint};

    use futures::{self, Future, BoxFuture};
    use jsonrpc_core::Error;
    use v1::helpers::errors;
    use v1::helpers::dispatch::{self, sign_and_dispatch};
    use v1::traits::Personal;
    use v1::types::{H160 as RpcH160, H256 as RpcH256, U128 as RpcU128, TransactionRequest};
    use v1::metadata::Metadata;

    /// Account management (personal) rpc implementation.
    pub struct PersonalClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {
    	accounts: Weak<AccountProvider>,
    	client: Weak<C>,
    	miner: Weak<M>,
    	allow_perm_unlock: bool,
    }

    impl<C, M> PersonalClient<C, M> where
    	C: MiningBlockChainClient,
    	M: MinerService,
    {
    	/// Creates new PersonalClient
    	pub fn new(store: &Arc<AccountProvider>, client: &Arc<C>, miner: &Arc<M>, allow_perm_unlock: bool) -> Self {
    		PersonalClient {
    			accounts: Arc::downgrade(store),
    			client: Arc::downgrade(client),
    			miner: Arc::downgrade(miner),
    			allow_perm_unlock: allow_perm_unlock,
    		}
    	}

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

    impl<C, M> Personal for PersonalClient<C, M> where
    	C: MiningBlockChainClient + 'static,
    	M: MinerService + 'static,
    {
    	type Metadata = Metadata;

    	fn accounts(&self) -> Result<Vec<RpcH160>, Error> {
    		self.active()?;

    		let store = take_weak!(self.accounts);
    		let accounts = store.accounts().map_err(|e| errors::account("Could not fetch accounts.", e))?;
    		Ok(accounts.into_iter().map(Into::into).collect::<Vec<RpcH160>>())
    	}

    	fn new_account(&self, pass: String) -> Result<RpcH160, Error> {
    		self.active()?;
    		let store = take_weak!(self.accounts);

    		store.new_account(&pass)
    			.map(Into::into)
    			.map_err(|e| errors::account("Could not create account.", e))
    	}

    	fn unlock_account(&self, account: RpcH160, account_pass: String, duration: Option<RpcU128>) -> Result<bool, Error> {
    		self.active()?;
    		let account: Address = account.into();
    		let store = take_weak!(self.accounts);
    		let duration = match duration {
    			None => None,
    			Some(duration) => {
    				let duration: U128 = duration.into();
    				let v = duration.low_u64() as u32;
    				if duration != v.into() {
    					return Err(errors::invalid_params("Duration", "Invalid Number"));
    				} else {
    					Some(v)
    				}
    			},
    		};

    		let r = match (self.allow_perm_unlock, duration) {
    			(false, _) => store.unlock_account_temporarily(account, account_pass),
    			(true, Some(0)) => store.unlock_account_permanently(account, account_pass),
    			(true, Some(d)) => store.unlock_account_timed(account, account_pass, d * 1000),
    			(true, None) => store.unlock_account_timed(account, account_pass, 300_000),
    		};
    		match r {
    			Ok(_) => Ok(true),
    			// TODO [ToDr] Proper error here?
    			Err(_) => Ok(false),
    		}
    	}

    	fn send_transaction(&self, meta: Metadata, request: TransactionRequest, password: String) -> BoxFuture<RpcH256, Error> {
    		let sign_and_send = move || {
    			self.active()?;
    			let client = take_weak!(self.client);
    			let miner = take_weak!(self.miner);
    			let accounts = take_weak!(self.accounts);

    			let default_account = match request.from {
    				Some(ref account) => account.clone().into(),
    				None => accounts
    					.default_address(meta.dapp_id.unwrap_or_default().into())
    					.map_err(|e| errors::account("Cannot find default account.", e))?,
    			};

    			let request = dispatch::fill_optional_fields(request.into(), default_account, &*client, &*miner);
    			sign_and_dispatch(
    				&*client,
    				&*miner,
    				&*accounts,
    				request,
    				dispatch::SignWith::Password(password)
    			).map(|v| v.into_value().into())
    		};

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

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