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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/>.

    use std::collections::HashSet;
    use ethkey::Address;
    use dir::{GethDirectory, KeyDirectory, DirectoryType};
    use Error;

    pub fn import_accounts(src: &KeyDirectory, dst: &KeyDirectory) -> Result<Vec<Address>, Error> {
    	let accounts = src.load()?;
    	let existing_accounts = dst.load()?.into_iter().map(|a| a.address).collect::<HashSet<_>>();

    	accounts.into_iter()
    		.filter(|a| !existing_accounts.contains(&a.address))
    		.map(|a| {
    			let address = a.address.clone();
    			dst.insert(a)?;
    			Ok(address)
    		}).collect()
    }

    /// Provide a `HashSet` of all accounts available for import from the Geth keystore.
    pub fn read_geth_accounts(testnet: bool) -> Vec<Address> {
    	let t = if testnet {
    		DirectoryType::Testnet
    	} else {
    		DirectoryType::Main
    	};

    	GethDirectory::open(t)
    		.load()
    		.map(|d| d.into_iter().map(|a| a.address).collect())
    		.unwrap_or_else(|_| Vec::new())
    }

    /// Import specific `desired` accounts from the Geth keystore into `dst`.
    pub fn import_geth_accounts(dst: &KeyDirectory, desired: HashSet<Address>, testnet: bool) -> Result<Vec<Address>, Error> {
    	let t = if testnet {
    		DirectoryType::Testnet
    	} else {
    		DirectoryType::Main
    	};

    	let src = GethDirectory::open(t);
    	let accounts = src.load()?;
    	let existing_accounts = dst.load()?.into_iter().map(|a| a.address).collect::<HashSet<_>>();

    	accounts.into_iter()
    		.filter(|a| !existing_accounts.contains(&a.address))
    		.filter(|a| desired.contains(&a.address))
    		.map(|a| {
    			let address = a.address.clone();
    			dst.insert(a)?;
    			Ok(address)
    		}).collect()
    }

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