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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/>.

    //! Block import analysis functions.

    use ethcore::client::BlockQueueInfo;
    use ethsync::SyncState;

    /// Check if client is during major sync or during block import.
    pub fn is_major_importing(sync_state: Option<SyncState>, queue_info: BlockQueueInfo) -> bool {
    	let is_syncing_state = sync_state.map_or(false, |s|
    		s != SyncState::Idle && s != SyncState::NewBlocks
    	);
    	let is_verifying = queue_info.unverified_queue_size + queue_info.verified_queue_size > 3;
    	is_verifying || is_syncing_state
    }

    #[cfg(test)]
    mod tests {
    	use ethcore::client::BlockQueueInfo;
    	use ethsync::SyncState;
    	use super::is_major_importing;

    	fn queue_info(unverified: usize, verified: usize) -> BlockQueueInfo {
    		BlockQueueInfo {
    			unverified_queue_size: unverified,
    			verified_queue_size: verified,
    			verifying_queue_size: 0,
    			max_queue_size: 1000,
    			max_mem_use: 1000,
    			mem_used: 500
    		}
    	}

    	#[test]
    	fn is_still_verifying() {
    		assert!(!is_major_importing(None, queue_info(2, 1)));
    		assert!(is_major_importing(None, queue_info(2, 2)));
    	}

    	#[test]
    	fn is_synced_state() {
    		assert!(is_major_importing(Some(SyncState::Blocks), queue_info(0, 0)));
    		assert!(!is_major_importing(Some(SyncState::Idle), queue_info(0, 0)));
    	}
    }

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