// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.

use ethcore::snapshot::{ManifestData, RestorationStatus, SnapshotService};

use bytes::Bytes;
use ethereum_types::H256;
use parking_lot::Mutex;

/// Mocked snapshot service (used for sync info extensions).
pub struct TestSnapshotService {
	status: Mutex<RestorationStatus>,
}

impl TestSnapshotService {
	/// Create a test snapshot service. Only the `status` function matters -- it'll
	/// return `Inactive` by default.
	pub fn new() -> Self {
		TestSnapshotService {
			status: Mutex::new(RestorationStatus::Inactive),
		}
	}

	/// Set the restoration status.
	pub fn set_status(&self, status: RestorationStatus) {
		*self.status.lock() = status;
	}
}

impl SnapshotService for TestSnapshotService {
	fn manifest(&self) -> Option<ManifestData> { None }
	fn supported_versions(&self) -> Option<(u64, u64)> { None }
	fn completed_chunks(&self) -> Option<Vec<H256>> { Some(vec![]) }
	fn chunk(&self, _hash: H256) -> Option<Bytes> { None }
	fn status(&self) -> RestorationStatus { self.status.lock().clone() }
	fn begin_restore(&self, _manifest: ManifestData) { }
	fn abort_restore(&self) { }
	fn restore_state_chunk(&self, _hash: H256, _chunk: Bytes) { }
	fn restore_block_chunk(&self, _hash: H256, _chunk: Bytes) { }
	fn shutdown(&self) { }
}