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// Copyright (c) 2020-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_INDEX_COINSTATSINDEX_H
#define BITCOIN_INDEX_COINSTATSINDEX_H
#include <chain.h>
#include <crypto/muhash.h>
#include <flatfile.h>
#include <index/base.h>
#include <kernel/coinstats.h>
/**
* CoinStatsIndex maintains statistics on the UTXO set.
*/
class CoinStatsIndex final : public BaseIndex
{
private:
std::string m_name;
std::unique_ptr<BaseIndex::DB> m_db;
MuHash3072 m_muhash;
uint64_t m_transaction_output_count{0};
uint64_t m_bogo_size{0};
CAmount m_total_amount{0};
CAmount m_total_subsidy{0};
CAmount m_total_unspendable_amount{0};
CAmount m_total_prevout_spent_amount{0};
CAmount m_total_new_outputs_ex_coinbase_amount{0};
CAmount m_total_coinbase_amount{0};
CAmount m_total_unspendables_genesis_block{0};
CAmount m_total_unspendables_bip30{0};
CAmount m_total_unspendables_scripts{0};
CAmount m_total_unspendables_unclaimed_rewards{0};
bool ReverseBlock(const CBlock& block, const CBlockIndex* pindex);
bool AllowPrune() const override { return true; }
protected:
bool CustomInit(const std::optional<interfaces::BlockKey>& block) override;
bool CommitInternal(CDBBatch& batch) override;
bool CustomAppend(const interfaces::BlockInfo& block) override;
bool Rewind(const CBlockIndex* current_tip, const CBlockIndex* new_tip) override;
BaseIndex::DB& GetDB() const override { return *m_db; }
const char* GetName() const override { return "coinstatsindex"; }
public:
// Constructs the index, which becomes available to be queried.
explicit CoinStatsIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
// Look up stats for a specific block using CBlockIndex
std::optional<kernel::CCoinsStats> LookUpStats(const CBlockIndex* block_index) const;
};
/// The global UTXO set hash object.
extern std::unique_ptr<CoinStatsIndex> g_coin_stats_index;
#endif // BITCOIN_INDEX_COINSTATSINDEX_H
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