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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/>.

    //! Minimal IO service for light client.
    //! Just handles block import messages and passes them to the client.

    use std::sync::Arc;

    use ethcore::service::ClientIoMessage;
    use ethcore::spec::Spec;
    use io::{IoContext, IoError, IoHandler, IoService};

    use super::{Client, Config as ClientConfig};

    /// Light client service.
    pub struct Service {
    	client: Arc<Client>,
    	_io_service: IoService<ClientIoMessage>,
    }

    impl Service {
    	/// Start the service: initialize I/O workers and client itself.
    	pub fn start(config: ClientConfig, spec: &Spec) -> Result<Self, IoError> {
    		let io_service = try!(IoService::<ClientIoMessage>::start());
    		let client = Arc::new(Client::new(config, spec, io_service.channel()));
    		try!(io_service.register_handler(Arc::new(ImportBlocks(client.clone()))));

    		Ok(Service {
    			client: client,
    			_io_service: io_service,
    		})
    	}

    	/// Get a handle to the client.
    	pub fn client(&self) -> &Arc<Client> {
    		&self.client
    	}
    }

    struct ImportBlocks(Arc<Client>);

    impl IoHandler<ClientIoMessage> for ImportBlocks {
    	fn message(&self, _io: &IoContext<ClientIoMessage>, message: &ClientIoMessage) {
    		if let ClientIoMessage::BlockVerified = *message {
    			self.0.import_verified();
    		}
    	}
    }

    #[cfg(test)]
    mod tests {
    	use super::Service;
    	use ethcore::spec::Spec;

    	#[test]
    	fn it_works() {
    		let spec = Spec::new_test();
    		Service::start(Default::default(), &spec).unwrap();
    	}
    }

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