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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/>.

    extern crate hyper;

    use hyper::header::ContentType;
    use hyper::method::Method;
    use hyper::client::{Request, Response, Client};
    use hyper::{Next};
    use hyper::net::HttpStream;
    use ethash::SeedHashCompute;
    use hyper::Url;
    use util::*;
    use ethereum::ethash::Ethash;

    /// Trait for notifying about new mining work
    pub trait NotifyWork : Send + Sync {
    	/// Fired when new mining job available
    	fn notify(&self, pow_hash: H256, difficulty: U256, number: u64);
    }

    pub struct WorkPoster {
    	urls: Vec<Url>,
    	client: Mutex<Client<PostHandler>>,
    	seed_compute: Mutex<SeedHashCompute>,
    }

    impl WorkPoster {
    	pub fn new(urls: &[String]) -> Self {
    		let urls = urls.into_iter().filter_map(|u| {
    			match Url::parse(u) {
    				Ok(url) => Some(url),
    				Err(e) => {
    					warn!("Error parsing URL {} : {}", u, e);
    					None
    				}
    			}
    		}).collect();
    		let client = WorkPoster::create_client();
    		WorkPoster {
    			client: Mutex::new(client),
    			urls: urls,
    			seed_compute: Mutex::new(SeedHashCompute::new()),
    		}
    	}

    	fn create_client() -> Client<PostHandler> {
    		Client::<PostHandler>::configure()
    			.keep_alive(true)
    			.build()
    			.expect("Error creating HTTP client")
    	}
    }

    impl NotifyWork for WorkPoster {
    	fn notify(&self, pow_hash: H256, difficulty: U256, number: u64) {
    		// TODO: move this to engine
    		let target = Ethash::difficulty_to_boundary(&difficulty);
    		let seed_hash = &self.seed_compute.lock().get_seedhash(number);
    		let seed_hash = H256::from_slice(&seed_hash[..]);
    		let body = format!(
    			r#"{{ "result": ["0x{}","0x{}","0x{}","0x{:x}"] }}"#,
    			pow_hash.hex(), seed_hash.hex(), target.hex(), number
    		);
    		let mut client = self.client.lock();
    		for u in &self.urls {
    			if let Err(e) = client.request(u.clone(), PostHandler { body: body.clone() }) {
    				warn!("Error sending HTTP notification to {} : {}, retrying", u, e);
    				// TODO: remove this once https://github.com/hyperium/hyper/issues/848 is fixed
    				*client = WorkPoster::create_client();
    				if let Err(e) = client.request(u.clone(), PostHandler { body: body.clone() }) {
    					warn!("Error sending HTTP notification to {} : {}", u, e);
    				}
    			}
    		}
    	}
    }

    struct PostHandler {
    	body: String,
    }

    impl hyper::client::Handler<HttpStream> for PostHandler {
    	fn on_request(&mut self, request: &mut Request) -> Next {
    		request.set_method(Method::Post);
    		request.headers_mut().set(ContentType::json());
    		Next::write()
    	}

    	fn on_request_writable(&mut self, encoder: &mut hyper::Encoder<HttpStream>) -> Next {
    		if let Err(e) = encoder.write_all(self.body.as_bytes()) {
    			trace!("Error posting work data: {}", e);
    		}
    		encoder.close();
    		Next::read()

    	}

    	fn on_response(&mut self, _response: Response) -> Next {
    		Next::end()
    	}

    	fn on_response_readable(&mut self, _decoder: &mut hyper::Decoder<HttpStream>) -> Next {
    		Next::end()
    	}

    	fn on_error(&mut self, err: hyper::Error) -> Next {
    		trace!("Error posting work data: {}", err);
    		Next::end()
    	}
    }

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