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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::HashMap;
    use std::sync::Arc;
    use std::time::{Instant, Duration};
    use util::{Mutex, U256, H256};

    /// External miner interface.
    pub trait ExternalMinerService: Send + Sync {
    	/// Submit hashrate for given miner.
    	fn submit_hashrate(&self, hashrate: U256, id: H256);

    	/// Total hashrate.
    	fn hashrate(&self) -> U256;
    }

    /// External Miner.
    pub struct ExternalMiner {
    	hashrates: Arc<Mutex<HashMap<H256, (Instant, U256)>>>,
    }

    impl Default for ExternalMiner {
    	fn default() -> Self {
    		ExternalMiner {
    			hashrates: Arc::new(Mutex::new(HashMap::new())),
    		}
    	}
    }

    impl ExternalMiner {
    	/// Creates new external miner with prefilled hashrates.
    	pub fn new(hashrates: Arc<Mutex<HashMap<H256, (Instant, U256)>>>) -> Self {
    		ExternalMiner {
    			hashrates: hashrates,
    		}
    	}
    }

    const ENTRY_TIMEOUT: u64 = 2;

    impl ExternalMinerService for ExternalMiner {
    	fn submit_hashrate(&self, hashrate: U256, id: H256) {
    		self.hashrates.lock().insert(id, (Instant::now() + Duration::from_secs(ENTRY_TIMEOUT), hashrate));
    	}

    	fn hashrate(&self) -> U256 {
    		let mut hashrates = self.hashrates.lock();
    		let h = hashrates.drain().filter(|&(_, (t, _))| t > Instant::now()).collect();
    		*hashrates = h;
    		hashrates.iter().fold(U256::from(0), |sum, (_, &(_, v))| sum + v)
    	}
    }

    #[cfg(test)]
    mod tests {
    	use super::*;
    	use std::thread::sleep;
    	use std::time::Duration;
    	use util::{H256, U256};

    	fn miner() -> ExternalMiner {
    		ExternalMiner::default()
    	}

    	#[test]
    	fn it_should_forget_old_hashrates() {
    		// given
    		let m = miner();
    		assert_eq!(m.hashrate(), U256::from(0));
    		m.submit_hashrate(U256::from(10), H256::from(1));
    		assert_eq!(m.hashrate(), U256::from(10));

    		// when
    		sleep(Duration::from_secs(3));

    		// then
    		assert_eq!(m.hashrate(), U256::from(0));
    	}

    	#[test]
    	fn should_sum_up_hashrate() {
    		// given
    		let m = miner();
    		assert_eq!(m.hashrate(), U256::from(0));
    		m.submit_hashrate(U256::from(10), H256::from(1));
    		assert_eq!(m.hashrate(), U256::from(10));

    		// when
    		m.submit_hashrate(U256::from(15), H256::from(1));
    		m.submit_hashrate(U256::from(20), H256::from(2));

    		// then
    		assert_eq!(m.hashrate(), U256::from(35));
    	}
    }

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