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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 keccak::Keccak256;
    use super::{KeyPair, Error, Generator, Secret};

    /// Simple brainwallet.
    pub struct Brain(String);

    impl Brain {
    	pub fn new(s: String) -> Self {
    		Brain(s)
    	}
    }

    impl Generator for Brain {
    	fn generate(self) -> Result<KeyPair, Error> {
    		let seed = self.0;
    		let mut secret = seed.bytes().collect::<Vec<u8>>().keccak256();

    		let mut i = 0;
    		loop {
    			secret = secret.keccak256();

    			match i > 16384 {
    				false => i += 1,
    				true => {
    					if let Ok(secret) = Secret::from_slice(&secret) {
    						let result = KeyPair::from_secret(secret);
    						if result.as_ref().ok().map_or(false, |r| r.address()[0] == 0) {
    							return result;
    						}
    					}
    				},
    			}
    		}
    	}
    }

    #[cfg(test)]
    mod tests {
    	use {Brain, Generator};

    	#[test]
    	fn test_brain() {
    		let words = "this is sparta!".to_owned();
    		let first_keypair = Brain(words.clone()).generate().unwrap();
    		let second_keypair = Brain(words.clone()).generate().unwrap();
    		assert_eq!(first_keypair.secret(), second_keypair.secret());
    	}
    }

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