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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/>.

    //! Test implementation of SyncProvider.

    use std::collections::BTreeMap;
    use util::{H256, RwLock};
    use ethsync::{SyncProvider, EthProtocolInfo, SyncStatus, SyncState, PeerInfo, TransactionStats};

    /// TestSyncProvider config.
    pub struct Config {
    	/// Protocol version.
    	pub network_id: u64,
    	/// Number of peers.
    	pub num_peers: usize,
    }

    /// Test sync provider.
    pub struct TestSyncProvider {
    	/// Sync status.
    	pub status: RwLock<SyncStatus>,
    }

    impl TestSyncProvider {
    	/// Creates new sync provider.
    	pub fn new(config: Config) -> Self {
    		TestSyncProvider {
    			status: RwLock::new(SyncStatus {
    				state: SyncState::Idle,
    				network_id: config.network_id,
    				protocol_version: 63,
    				start_block_number: 0,
    				last_imported_block_number: None,
    				highest_block_number: None,
    				blocks_total: 0,
    				blocks_received: 0,
    				num_peers: config.num_peers,
    				num_active_peers: 0,
    				mem_used: 0,
    				num_snapshot_chunks: 0,
    				snapshot_chunks_done: 0,
    				last_imported_old_block_number: None,
    			}),
    		}
    	}

    	/// Simulate importing blocks.
    	pub fn increase_imported_block_number(&self, count: u64) {
    		let mut status =  self.status.write();
    		let current_number = status.last_imported_block_number.unwrap_or(0);
    		status.last_imported_block_number = Some(current_number + count);
    	}
    }

    impl SyncProvider for TestSyncProvider {
    	fn status(&self) -> SyncStatus {
    		self.status.read().clone()
    	}

    	fn peers(&self) -> Vec<PeerInfo> {
    		vec![
    			PeerInfo {
    				id: Some("node1".to_owned()),
        			client_version: "Parity/1".to_owned(),
    				capabilities: vec!["eth/62".to_owned(), "eth/63".to_owned()],
        			remote_address: "127.0.0.1:7777".to_owned(),
    				local_address: "127.0.0.1:8888".to_owned(),
    				eth_info: Some(EthProtocolInfo {
    					version: 62,
    					difficulty: Some(40.into()),
    					head: 50.into(),
    				}),
    				les_info: None,
    			},
    			PeerInfo {
    				id: None,
        			client_version: "Parity/2".to_owned(),
    				capabilities: vec!["eth/63".to_owned(), "eth/64".to_owned()],
        			remote_address: "Handshake".to_owned(),
    				local_address: "127.0.0.1:3333".to_owned(),
    				eth_info: Some(EthProtocolInfo {
    					version: 64,
    					difficulty: None,
    					head: 60.into()
    				}),
    				les_info: None,
    			}
    		]
    	}

    	fn enode(&self) -> Option<String> {
    		None
    	}

    	fn transactions_stats(&self) -> BTreeMap<H256, TransactionStats> {
    		map![
    			1.into() => TransactionStats {
    				first_seen: 10,
    				propagated_to: map![
    					128.into() => 16
    				],
    			},
    			5.into() => TransactionStats {
    				first_seen: 16,
    				propagated_to: map![
    					16.into() => 1
    				],
    			}
    		]
    	}
    }

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