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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::BTreeMap;
    use util::Address;
    use builtin::Builtin;
    use engines::{Engine, Seal};
    use env_info::EnvInfo;
    use spec::CommonParams;
    use evm::Schedule;
    use block::ExecutedBlock;

    /// An engine which does not provide any consensus mechanism, just seals blocks internally.
    pub struct InstantSeal {
    	params: CommonParams,
    	builtins: BTreeMap<Address, Builtin>,
    }

    impl InstantSeal {
    	/// Returns new instance of InstantSeal with default VM Factory
    	pub fn new(params: CommonParams, builtins: BTreeMap<Address, Builtin>) -> Self {
    		InstantSeal {
    			params: params,
    			builtins: builtins,
    		}
    	}
    }

    impl Engine for InstantSeal {
    	fn name(&self) -> &str {
    		"InstantSeal"
    	}

    	fn params(&self) -> &CommonParams {
    		&self.params
    	}

    	fn builtins(&self) -> &BTreeMap<Address, Builtin> {
    		&self.builtins
    	}

    	fn schedule(&self, _env_info: &EnvInfo) -> Schedule {
    		Schedule::new_post_eip150(usize::max_value(), true, true, true)
    	}

    	fn is_sealer(&self, _author: &Address) -> Option<bool> { Some(true) }

    	fn generate_seal(&self, _block: &ExecutedBlock) -> Seal {
    		Seal::Regular(Vec::new())
    	}
    }

    #[cfg(test)]
    mod tests {
    	use util::*;
    	use tests::helpers::*;
    	use spec::Spec;
    	use header::Header;
    	use block::*;
    	use engines::Seal;

    	#[test]
    	fn instant_can_seal() {
    		let spec = Spec::new_instant();
    		let engine = &*spec.engine;
    		let genesis_header = spec.genesis_header();
    		let mut db_result = get_temp_state_db();
    		let db = spec.ensure_db_good(db_result.take(), &Default::default()).unwrap();
    		let last_hashes = Arc::new(vec![genesis_header.hash()]);
    		let b = OpenBlock::new(engine, Default::default(), false, db, &genesis_header, last_hashes, Address::default(), (3141562.into(), 31415620.into()), vec![]).unwrap();
    		let b = b.close_and_lock();
    		if let Seal::Regular(seal) = engine.generate_seal(b.block()) {
    			assert!(b.try_seal(engine, seal).is_ok());
    		}
    	}

    	#[test]
    	fn instant_cant_verify() {
    		let engine = Spec::new_instant().engine;
    		let mut header: Header = Header::default();

    		assert!(engine.verify_block_basic(&header, None).is_ok());

    		header.set_seal(vec![::rlp::encode(&H520::default()).to_vec()]);

    		assert!(engine.verify_block_unordered(&header, None).is_ok());
    	}
    }

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