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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/>.

    //! Snapshot-related errors.

    use std::fmt;

    use ids::BlockId;

    use util::H256;
    use util::trie::TrieError;
    use rlp::DecoderError;

    /// Snapshot-related errors.
    #[derive(Debug)]
    pub enum Error {
    	/// Invalid starting block for snapshot.
    	InvalidStartingBlock(BlockId),
    	/// Block not found.
    	BlockNotFound(H256),
    	/// Incomplete chain.
    	IncompleteChain,
    	/// Best block has wrong state root.
    	WrongStateRoot(H256, H256),
    	/// Wrong block hash.
    	WrongBlockHash(u64, H256, H256),
    	/// Too many blocks contained within the snapshot.
    	TooManyBlocks(u64, u64),
    	/// Old starting block in a pruned database.
    	OldBlockPrunedDB,
    	/// Missing code.
    	MissingCode(Vec<H256>),
    	/// Unrecognized code encoding.
    	UnrecognizedCodeState(u8),
    	/// Restoration aborted.
    	RestorationAborted,
    	/// Trie error.
    	Trie(TrieError),
    	/// Decoder error.
    	Decoder(DecoderError),
    	/// Io error.
    	Io(::std::io::Error),
    }

    impl fmt::Display for Error {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		match *self {
    			Error::InvalidStartingBlock(ref id) => write!(f, "Invalid starting block: {:?}", id),
    			Error::BlockNotFound(ref hash) => write!(f, "Block not found in chain: {}", hash),
    			Error::IncompleteChain => write!(f, "Incomplete blockchain."),
    			Error::WrongStateRoot(ref expected, ref found) => write!(f, "Final block has wrong state root. Expected {:?}, got {:?}", expected, found),
    			Error::WrongBlockHash(ref num, ref expected, ref found) =>
    				write!(f, "Block {} had wrong hash. expected {:?}, got {:?}", num, expected, found),
    			Error::TooManyBlocks(ref expected, ref found) => write!(f, "Snapshot contained too many blocks. Expected {}, got {}", expected, found),
    			Error::OldBlockPrunedDB => write!(f, "Attempted to create a snapshot at an old block while using \
    				a pruned database. Please re-run with the --pruning archive flag."),
    			Error::MissingCode(ref missing) => write!(f, "Incomplete snapshot: {} contract codes not found.", missing.len()),
    			Error::UnrecognizedCodeState(state) => write!(f, "Unrecognized code encoding ({})", state),
    			Error::RestorationAborted => write!(f, "Snapshot restoration aborted."),
    			Error::Io(ref err) => err.fmt(f),
    			Error::Decoder(ref err) => err.fmt(f),
    			Error::Trie(ref err) => err.fmt(f),
    		}
    	}
    }

    impl From<::std::io::Error> for Error {
    	fn from(err: ::std::io::Error) -> Self {
    		Error::Io(err)
    	}
    }

    impl From<TrieError> for Error {
    	fn from(err: TrieError) -> Self {
    		Error::Trie(err)
    	}
    }

    impl From<DecoderError> for Error {
    	fn from(err: DecoderError) -> Self {
    		Error::Decoder(err)
    	}
    }

    impl<E> From<Box<E>> for Error where Error: From<E> {
    	fn from(err: Box<E>) -> Self {
    		Error::from(*err)
    	}
    }

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