// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 The Palladium Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef PALLADIUM_NODE_UTXO_SNAPSHOT_H
#define PALLADIUM_NODE_UTXO_SNAPSHOT_H

#include <uint256.h>
#include <serialize.h>

//! Metadata describing a serialized version of a UTXO set from which an
//! assumeutxo CChainState can be constructed.
class SnapshotMetadata
{
public:
    //! The hash of the block that reflects the tip of the chain for the
    //! UTXO set contained in this snapshot.
    uint256 m_base_blockhash;

    //! The number of coins in the UTXO set contained in this snapshot. Used
    //! during snapshot load to estimate progress of UTXO set reconstruction.
    uint64_t m_coins_count = 0;

    //! Necessary to "fake" the base nChainTx so that we can estimate progress during
    //! initial block download for the assumeutxo chainstate.
    unsigned int m_nchaintx = 0;

    SnapshotMetadata() { }
    SnapshotMetadata(
        const uint256& base_blockhash,
        uint64_t coins_count,
        unsigned int nchaintx) :
            m_base_blockhash(base_blockhash),
            m_coins_count(coins_count),
            m_nchaintx(nchaintx) { }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action)
    {
        READWRITE(m_base_blockhash);
        READWRITE(m_coins_count);
        READWRITE(m_nchaintx);
    }

};

#endif // PALLADIUM_NODE_UTXO_SNAPSHOT_H
