wallet.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 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 FABCOIN_WALLET_WALLET_H
#define FABCOIN_WALLET_WALLET_H

#include <amount.h>
#include <policy/feerate.h>
#include <streams.h>
#include <tinyformat.h>
#include <ui_interface.h>
#include <utilstrencodings.h>
#include <validationinterface.h>
#include <script/ismine.h>
#include <script/sign.h>
#include <wallet/crypter.h>
#include <wallet/walletdb.h>
#include <wallet/rpcwallet.h>
#include <consensus/params.h>

#include <algorithm>
#include <atomic>
#include <map>
#include <set>
#include <stdexcept>
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>

typedef CWallet* CWalletRef;
extern std::vector<CWalletRef> vpwallets;

extern CAmount nReserveBalance;
extern CFeeRate payTxFee;
extern unsigned int nTxConfirmTarget;
extern bool bSpendZeroConfChange;
extern bool bZeroBalanceAddressToken;
extern bool fWalletRbf;
extern bool fWalletUnlockStakingOnly;
extern bool fNotUseChangeAddress;
extern bool fCheckForUpdates;
extern bool fBatchProcessingMode;

static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
static const CAmount DEFAULT_TRANSACTION_FEE = 0;
static const CAmount DEFAULT_FALLBACK_FEE = 20000;
static const CAmount DEFAULT_DISCARD_FEE = 10000;
//static const CAmount DEFAULT_TRANSACTION_MINFEE = 400000;
static const CAmount DEFAULT_TRANSACTION_MINFEE = 1000;
static const CAmount WALLET_INCREMENTAL_RELAY_FEE = 5000;
static const CAmount MIN_CHANGE = CENT;
static const CAmount MIN_FINAL_CHANGE = MIN_CHANGE/2;
static const bool DEFAULT_SPEND_ZEROCONF_CHANGE = true;
static const bool DEFAULT_ZERO_BALANCE_ADDRESS_TOKEN = true;
static const bool DEFAULT_WALLET_REJECT_LONG_CHAINS = false;
static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 6;
static const bool DEFAULT_WALLET_RBF = false;
static const bool DEFAULT_WALLETBROADCAST = true;
static const bool DEFAULT_DISABLE_WALLET = false;
static const bool DEFAULT_USE_HD_WALLET = true;

extern const char * DEFAULT_WALLET_DAT;

static const int64_t TIMESTAMP_MIN = 0;

static const bool DEFAULT_NOT_USE_CHANGE_ADDRESS = false;

static const bool DEFAULT_CHECK_FOR_UPDATES = true;

class CBlockIndex;
class CCoinControl;
class COutput;
class CReserveKey;
class CScript;
class CScheduler;
class CTxMemPool;
class CBlockPolicyEstimator;
class CWalletTx;
class CTokenTx;
class CContractBookData;
struct FeeCalculation;
enum class FeeEstimateMode;

enum WalletFeature
{
    FEATURE_BASE = 10500, // the earliest version new wallets supports (only useful for getinfo's clientversion output)

    FEATURE_WALLETCRYPT = 40000, // wallet encryption
    FEATURE_COMPRPUBKEY = 60000, // compressed public keys

    FEATURE_HD = 130000, // Hierarchical key derivation after BIP32 (HD Wallet)

    FEATURE_HD_SPLIT = 139900, // Wallet with HD chain split (change outputs will use m/0'/1'/k)

    FEATURE_LATEST = FEATURE_COMPRPUBKEY // HD is optional, use FEATURE_COMPRPUBKEY as latest version
};


class CKeyPool
{
public:
    int64_t nTime;
    CPubKey vchPubKey;
    bool fInternal; // for change outputs

    CKeyPool();
    CKeyPool(const CPubKey& vchPubKeyIn, bool internalIn);

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        int nVersion = s.GetVersion();
        if (!(s.GetType() & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(nTime);
        READWRITE(vchPubKey);
        if (ser_action.ForRead()) {
            try {
                READWRITE(fInternal);
            }
            catch (std::ios_base::failure&) {
                /* flag as external address if we can't read the internal boolean
                   (this will be the case for any wallet before the HD chain split version) */
                fInternal = false;
            }
        }
        else {
            READWRITE(fInternal);
        }
    }
};

class CAddressBookData
{
public:
    std::string name;
    std::string purpose;

    CAddressBookData() : purpose("unknown") {}

    typedef std::map<std::string, std::string> StringMap;
    StringMap destdata;
};

struct CRecipient
{
    CScript scriptPubKey;
    CAmount nAmount;
    bool fSubtractFeeFromAmount;
};

typedef std::map<std::string, std::string> mapValue_t;


static inline void ReadOrderPos(int64_t& nOrderPos, mapValue_t& mapValue)
{
    if (!mapValue.count("n"))
    {
        nOrderPos = -1; // TODO: calculate elsewhere
        return;
    }
    nOrderPos = atoi64(mapValue["n"].c_str());
}


static inline void WriteOrderPos(const int64_t& nOrderPos, mapValue_t& mapValue)
{
    if (nOrderPos == -1)
        return;
    mapValue["n"] = i64tostr(nOrderPos);
}

struct COutputEntry
{
    CTxDestination destination;
    CAmount amount;
    int vout;
};

class CMerkleTx
{
private:
    static const uint256 ABANDON_HASH;

public:
    CTransactionRef tx;
    uint256 hashBlock;

    /* An nIndex == -1 means that hashBlock (in nonzero) refers to the earliest
     * block in the chain we know this or any in-wallet dependency conflicts
     * with. Older clients interpret nIndex == -1 as unconfirmed for backward
     * compatibility.
     */
    int nIndex;

    CMerkleTx()
    {
        SetTx(MakeTransactionRef());
        Init();
    }

    CMerkleTx(CTransactionRef arg)
    {
        SetTx(std::move(arg));
        Init();
    }

    operator const CTransaction&() const { return *tx; }

    void Init()
    {
        hashBlock = uint256();
        nIndex = -1;
    }

    void SetTx(CTransactionRef arg)
    {
        tx = std::move(arg);
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        std::vector<uint256> vMerkleBranch; // For compatibility with older versions.
        READWRITE(tx);
        READWRITE(hashBlock);
        READWRITE(vMerkleBranch);
        READWRITE(nIndex);
    }

    void SetMerkleBranch(const CBlockIndex* pIndex, int posInBlock);

    int GetDepthInMainChain(const CBlockIndex* &pindexRet) const;
    int GetDepthInMainChain() const { const CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet); }
    int GetHeight() const;
    bool IsInMainChain() const { const CBlockIndex *pindexRet; return GetDepthInMainChain(pindexRet) > 0; }
    int GetBlocksToMaturity() const;
    bool AcceptToMemoryPool(const CAmount& nAbsurdFee, CValidationState& state);
    bool hashUnset() const { return (hashBlock.IsNull() || hashBlock == ABANDON_HASH); }
    bool isAbandoned() const { return (hashBlock == ABANDON_HASH); }
    void setAbandoned() { hashBlock = ABANDON_HASH; }

    const uint256& GetHash() const { return tx->GetHash(); }
    bool IsCoinBase() const { return tx->IsCoinBase(); }
    bool IsCoinStake() const { return false; }
};

class CWalletTx : public CMerkleTx
{
private:
    const CWallet* pwallet;

public:
    mapValue_t mapValue;
    std::vector<std::pair<std::string, std::string> > vOrderForm;
    unsigned int fTimeReceivedIsTxTime;
    unsigned int nTimeReceived; 

    unsigned int nTimeSmart;
    char fFromMe;
    std::string strFromAccount;
    int64_t nOrderPos; 

    // memory only
    mutable bool fDebitCached;
    mutable bool fCreditCached;
    mutable bool fImmatureCreditCached;
    mutable bool fAvailableCreditCached;
    mutable bool fWatchDebitCached;
    mutable bool fWatchCreditCached;
    mutable bool fImmatureWatchCreditCached;
    mutable bool fAvailableWatchCreditCached;
    mutable bool fChangeCached;
    mutable CAmount nDebitCached;
    mutable CAmount nCreditCached;
    mutable CAmount nImmatureCreditCached;
    mutable CAmount nAvailableCreditCached;
    mutable CAmount nWatchDebitCached;
    mutable CAmount nWatchCreditCached;
    mutable CAmount nImmatureWatchCreditCached;
    mutable CAmount nAvailableWatchCreditCached;
    mutable CAmount nChangeCached;

    CWalletTx()
    {
        Init(nullptr);
    }

    CWalletTx(const CWallet* pwalletIn, CTransactionRef arg) : CMerkleTx(std::move(arg))
    {
        Init(pwalletIn);
    }

    void Init(const CWallet* pwalletIn)
    {
        pwallet = pwalletIn;
        mapValue.clear();
        vOrderForm.clear();
        fTimeReceivedIsTxTime = false;
        nTimeReceived = 0;
        nTimeSmart = 0;
        fFromMe = false;
        strFromAccount.clear();
        fDebitCached = false;
        fCreditCached = false;
        fImmatureCreditCached = false;
        fAvailableCreditCached = false;
        fWatchDebitCached = false;
        fWatchCreditCached = false;
        fImmatureWatchCreditCached = false;
        fAvailableWatchCreditCached = false;
        fChangeCached = false;
        nDebitCached = 0;
        nCreditCached = 0;
        nImmatureCreditCached = 0;
        nAvailableCreditCached = 0;
        nWatchDebitCached = 0;
        nWatchCreditCached = 0;
        nAvailableWatchCreditCached = 0;
        nImmatureWatchCreditCached = 0;
        nChangeCached = 0;
        nOrderPos = -1;
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        if (ser_action.ForRead())
            Init(nullptr);
        char fSpent = false;

        if (!ser_action.ForRead())
        {
            mapValue["fromaccount"] = strFromAccount;

            WriteOrderPos(nOrderPos, mapValue);

            if (nTimeSmart)
                mapValue["timesmart"] = strprintf("%u", nTimeSmart);
        }

        READWRITE(*(CMerkleTx*)this);
        std::vector<CMerkleTx> vUnused; 
        READWRITE(vUnused);
        READWRITE(mapValue);
        READWRITE(vOrderForm);
        READWRITE(fTimeReceivedIsTxTime);
        READWRITE(nTimeReceived);
        READWRITE(fFromMe);
        READWRITE(fSpent);

        if (ser_action.ForRead())
        {
            strFromAccount = mapValue["fromaccount"];

            ReadOrderPos(nOrderPos, mapValue);

            nTimeSmart = mapValue.count("timesmart") ? (unsigned int)atoi64(mapValue["timesmart"]) : 0;
        }

        mapValue.erase("fromaccount");
        mapValue.erase("spent");
        mapValue.erase("n");
        mapValue.erase("timesmart");
    }

    void MarkDirty()
    {
        fCreditCached = false;
        fAvailableCreditCached = false;
        fImmatureCreditCached = false;
        fWatchDebitCached = false;
        fWatchCreditCached = false;
        fAvailableWatchCreditCached = false;
        fImmatureWatchCreditCached = false;
        fDebitCached = false;
        fChangeCached = false;
    }

    void BindWallet(CWallet *pwalletIn)
    {
        pwallet = pwalletIn;
        MarkDirty();
    }

    CAmount GetDebit(const isminefilter& filter) const;
    CAmount GetCredit(const isminefilter& filter) const;
    CAmount GetImmatureCredit(bool fUseCache=true) const;
    CAmount GetAvailableCredit(bool fUseCache=true) const;
    CAmount GetImmatureWatchOnlyCredit(const bool& fUseCache=true) const;
    CAmount GetAvailableWatchOnlyCredit(const bool& fUseCache=true) const;
    CAmount GetChange() const;

    void GetAmounts(std::list<COutputEntry>& listReceived,
                    std::list<COutputEntry>& listSent, CAmount& nFee, std::string& strSentAccount, const isminefilter& filter) const;

    bool IsFromMe(const isminefilter& filter) const
    {
        return (GetDebit(filter) > 0);
    }

    // True if only scriptSigs are different
    bool IsEquivalentTo(const CWalletTx& tx) const;

    bool InMempool() const;
    bool IsTrusted() const;

    int64_t GetTxTime() const;
    int GetRequestCount() const;

    // RelayWalletTransaction may only be called if fBroadcastTransactions!
    bool RelayWalletTransaction(CConnman* connman);

    std::set<uint256> GetConflicts() const;
};


class CInputCoin {
public:
    CInputCoin(const CWalletTx* walletTx, unsigned int i)
    {
        if (!walletTx)
            throw std::invalid_argument("walletTx should not be null");
        if (i >= walletTx->tx->vout.size())
            throw std::out_of_range("The output index is out of range");

        outpoint = COutPoint(walletTx->GetHash(), i);
        txout = walletTx->tx->vout[i];
    }

    COutPoint outpoint;
    CTxOut txout;

    bool operator<(const CInputCoin& rhs) const {
        return outpoint < rhs.outpoint;
    }

    bool operator!=(const CInputCoin& rhs) const {
        return outpoint != rhs.outpoint;
    }

    bool operator==(const CInputCoin& rhs) const {
        return outpoint == rhs.outpoint;
    }
};

class COutput
{
public:
    const CWalletTx *tx;
    int i;
    int nDepth;

    bool fSpendable;

    bool fSolvable;

    bool fSafe;

    COutput(const CWalletTx *txIn, int iIn, int nDepthIn, bool fSpendableIn, bool fSolvableIn, bool fSafeIn)
    {
        tx = txIn; i = iIn; nDepth = nDepthIn; fSpendable = fSpendableIn; fSolvable = fSolvableIn; fSafe = fSafeIn;
    }

    std::string ToString() const;
};




class CWalletKey
{
public:
    CPrivKey vchPrivKey;
    int64_t nTimeCreated;
    int64_t nTimeExpires;
    std::string strComment;

    CWalletKey(int64_t nExpires=0);

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        int nVersion = s.GetVersion();
        if (!(s.GetType() & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(vchPrivKey);
        READWRITE(nTimeCreated);
        READWRITE(nTimeExpires);
        READWRITE(LIMITED_STRING(strComment, 65536));
    }
};

class CAccountingEntry
{
public:
    std::string strAccount;
    CAmount nCreditDebit;
    int64_t nTime;
    std::string strOtherAccount;
    std::string strComment;
    mapValue_t mapValue;
    int64_t nOrderPos; 
    uint64_t nEntryNo;

    CAccountingEntry()
    {
        SetNull();
    }

    void SetNull()
    {
        nCreditDebit = 0;
        nTime = 0;
        strAccount.clear();
        strOtherAccount.clear();
        strComment.clear();
        nOrderPos = -1;
        nEntryNo = 0;
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        int nVersion = s.GetVersion();
        if (!(s.GetType() & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(nCreditDebit);
        READWRITE(nTime);
        READWRITE(LIMITED_STRING(strOtherAccount, 65536));

        if (!ser_action.ForRead())
        {
            WriteOrderPos(nOrderPos, mapValue);

            if (!(mapValue.empty() && _ssExtra.empty()))
            {
                CDataStream ss(s.GetType(), s.GetVersion());
                ss.insert(ss.begin(), '\0');
                ss << mapValue;
                ss.insert(ss.end(), _ssExtra.begin(), _ssExtra.end());
                strComment.append(ss.str());
            }
        }

        READWRITE(LIMITED_STRING(strComment, 65536));

        size_t nSepPos = strComment.find("\0", 0, 1);
        if (ser_action.ForRead())
        {
            mapValue.clear();
            if (std::string::npos != nSepPos)
            {
                CDataStream ss(std::vector<char>(strComment.begin() + nSepPos + 1, strComment.end()), s.GetType(), s.GetVersion());
                ss >> mapValue;
                _ssExtra = std::vector<char>(ss.begin(), ss.end());
            }
            ReadOrderPos(nOrderPos, mapValue);
        }
        if (std::string::npos != nSepPos)
            strComment.erase(nSepPos);

        mapValue.erase("n");
    }

private:
    std::vector<char> _ssExtra;
};


class CWallet : public CCryptoKeyStore, public CValidationInterface
{
private:
    static std::atomic<bool> fFlushScheduled;
    std::atomic<bool> fAbortRescan;
    std::atomic<bool> fScanningWallet;

    bool SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAmount& nTargetValue, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet, const CCoinControl *coinControl = nullptr) const;

    CWalletDB *pwalletdbEncryption;

    int nWalletVersion;

    int nWalletMaxVersion;

    int64_t nNextResend;
    int64_t nLastResend;
    bool fBroadcastTransactions;

    typedef std::multimap<COutPoint, uint256> TxSpends;
    TxSpends mapTxSpends;
    void AddToSpends(const COutPoint& outpoint, const uint256& wtxid);
    void AddToSpends(const uint256& wtxid);

    /* Mark a transaction (and its in-wallet descendants) as conflicting with a particular block. */
    void MarkConflicted(const uint256& hashBlock, const uint256& hashTx);

    void SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator>);

    /* Used by TransactionAddedToMemorypool/BlockConnected/Disconnected.
     * Should be called with pindexBlock and posInBlock if this is for a transaction that is included in a block. */
    void SyncTransaction(const CTransactionRef& tx, const CBlockIndex *pindex = nullptr, int posInBlock = 0);

    /* the HD chain data model (external chain counters) */
    CHDChain hdChain;

    /* HD derive new child key (on internal or external chain) */
    void DeriveNewChildKey(CWalletDB &walletdb, CKeyMetadata& metadata, CKey& secret, bool internal = false);

    std::set<int64_t> setInternalKeyPool;
    std::set<int64_t> setExternalKeyPool;
    int64_t m_max_keypool_index;
    std::map<CKeyID, int64_t> m_pool_key_to_index;

    int64_t nTimeFirstKey;

    bool AddWatchOnly(const CScript& dest) override;

    std::unique_ptr<CWalletDBWrapper> dbw;

public:
    /*
     * Main wallet lock.
     * This lock protects all the fields added by CWallet.
     */
    mutable CCriticalSection cs_wallet;

    CWalletDBWrapper& GetDBHandle()
    {
        return *dbw;
    }

    std::string GetName() const
    {
        if (dbw) {
            return dbw->GetName();
        } else {
            return "dummy";
        }
    }

    void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool);

    // Map from Key ID (for regular keys) or Script ID (for watch-only keys) to
    // key metadata.
    std::map<CTxDestination, CKeyMetadata> mapKeyMetadata;

    typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
    MasterKeyMap mapMasterKeys;
    unsigned int nMasterKeyMaxID;

    // Create wallet with dummy database handle
    CWallet(): dbw(new CWalletDBWrapper())
    {
        SetNull();
    }

    // Create wallet with passed-in database handle
    CWallet(std::unique_ptr<CWalletDBWrapper> dbw_in) : dbw(std::move(dbw_in))
    {
        SetNull();
    }

    ~CWallet()
    {
        delete pwalletdbEncryption;
        pwalletdbEncryption = nullptr;
    }

    void SetNull()
    {
        nWalletVersion = FEATURE_BASE;
        nWalletMaxVersion = FEATURE_BASE;
        nMasterKeyMaxID = 0;
        pwalletdbEncryption = nullptr;
        nOrderPosNext = 0;
        nAccountingEntryNumber = 0;
        nNextResend = 0;
        nLastResend = 0;
        m_max_keypool_index = 0;
        nTimeFirstKey = 0;
        fBroadcastTransactions = false;
        nRelockTime = 0;
        fAbortRescan = false;
        fScanningWallet = false;
    }

    std::map<uint256, CWalletTx> mapWallet;
    std::list<CAccountingEntry> laccentries;

    typedef std::pair<CWalletTx*, CAccountingEntry*> TxPair;
    typedef std::multimap<int64_t, TxPair > TxItems;
    TxItems wtxOrdered;

    int64_t nOrderPosNext;
    uint64_t nAccountingEntryNumber;
    std::map<uint256, int> mapRequestCount;

    std::map<CTxDestination, CAddressBookData> mapAddressBook;

    std::map<std::string, CContractBookData> mapContractBook;

    CPubKey vchDefaultKey;

    std::set<COutPoint> setLockedCoins;

    std::map<uint256, CTokenInfo> mapToken;

    std::map<uint256, CTokenTx> mapTokenTx;

    const CWalletTx* GetWalletTx(const uint256& hash) const;

    bool CanSupportFeature(enum WalletFeature wf) const { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }

    void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlySafe=true, const CCoinControl *coinControl = nullptr, const CAmount& nMinimumAmount = 1, const CAmount& nMaximumAmount = MAX_MONEY, const CAmount& nMinimumSumAmount = MAX_MONEY, const uint64_t& nMaximumCount = 0, const int& nMinDepth = 0, const int& nMaxDepth = 9999999) const;

    std::map<CTxDestination, std::vector<COutput>> ListCoins() const;

    const CTxOut& FindNonChangeParentOutput(const CTransaction& tx, int output) const;

    bool SelectCoinsMinConf(const CAmount& nTargetValue, int nConfMine, int nConfTheirs, uint64_t nMaxAncestors, std::vector<COutput> vCoins, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet) const;

    bool IsSpent(const uint256& hash, unsigned int n) const;

    bool IsLockedCoin(uint256 hash, unsigned int n) const;
    void LockCoin(const COutPoint& output);
    void UnlockCoin(const COutPoint& output);
    void UnlockAllCoins();
    void ListLockedCoins(std::vector<COutPoint>& vOutpts) const;

    /*
     * Rescan abort properties
     */
    void AbortRescan() { fAbortRescan = true; }
    bool IsAbortingRescan() { return fAbortRescan; }
    bool IsScanning() { return fScanningWallet; }

    CPubKey GenerateNewKey(CWalletDB& walletdb, bool internal = false);
    bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey) override;
    bool AddKeyPubKeyWithDB(CWalletDB &walletdb,const CKey& key, const CPubKey &pubkey);
    bool LoadKey(const CKey& key, const CPubKey &pubkey) { return CCryptoKeyStore::AddKeyPubKey(key, pubkey); }
    bool LoadKeyMetadata(const CTxDestination& pubKey, const CKeyMetadata &metadata);

    bool LoadMinVersion(int nVersion) { AssertLockHeld(cs_wallet); nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }
    void UpdateTimeFirstKey(int64_t nCreateTime);

    bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret) override;
    bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
    bool AddCScript(const CScript& redeemScript) override;
    bool LoadCScript(const CScript& redeemScript);

    bool AddDestData(const CTxDestination &dest, const std::string &key, const std::string &value);
    bool EraseDestData(const CTxDestination &dest, const std::string &key);
    bool LoadDestData(const CTxDestination &dest, const std::string &key, const std::string &value);
    bool GetDestData(const CTxDestination &dest, const std::string &key, std::string *value) const;
    std::vector<std::string> GetDestValues(const std::string& prefix) const;

    bool AddWatchOnly(const CScript& dest, int64_t nCreateTime);
    bool RemoveWatchOnly(const CScript &dest) override;
    bool LoadWatchOnly(const CScript &dest);

    int64_t nRelockTime;

    bool Unlock(const SecureString& strWalletPassphrase);
    bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
    bool EncryptWallet(const SecureString& strWalletPassphrase);

    void GetKeyBirthTimes(std::map<CTxDestination, int64_t> &mapKeyBirth) const;
    unsigned int ComputeTimeSmart(const CWalletTx& wtx) const;

    bool LoadToken(const CTokenInfo &token);

    bool LoadTokenTx(const CTokenTx &tokenTx);

    bool LoadContractData(const std::string &address, const std::string &key, const std::string &value);

    int64_t IncOrderPosNext(CWalletDB *pwalletdb = nullptr);
    DBErrors ReorderTransactions();
    bool AccountMove(std::string strFrom, std::string strTo, CAmount nAmount, std::string strComment = "");
    bool GetAccountPubkey(CPubKey &pubKey, std::string strAccount, bool bForceNew = false);

    void MarkDirty();
    bool AddToWallet(const CWalletTx& wtxIn, bool fFlushOnClose=true);
    bool LoadToWallet(const CWalletTx& wtxIn);
    void TransactionAddedToMempool(const CTransactionRef& tx) override;
    void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex *pindex, const std::vector<CTransactionRef>& vtxConflicted) override;
    void BlockDisconnected(const std::shared_ptr<const CBlock>& pblock) override;
    bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, const CBlockIndex* pIndex, int posInBlock, bool fUpdate);
    int64_t RescanFromTime(int64_t startTime, bool update);
    CBlockIndex* ScanForWalletTransactions(CBlockIndex* pindexStart, bool fUpdate = false);
    void ReacceptWalletTransactions();
    void ResendWalletTransactions(int64_t nBestBlockTime, CConnman* connman) override;
    // ResendWalletTransactionsBefore may only be called if fBroadcastTransactions!
    std::vector<uint256> ResendWalletTransactionsBefore(int64_t nTime, CConnman* connman);
    CAmount GetBalance() const;
    CAmount GetUnconfirmedBalance() const;
    CAmount GetImmatureBalance() const;
    CAmount GetWatchOnlyBalance() const;
    CAmount GetUnconfirmedWatchOnlyBalance() const;
    CAmount GetImmatureWatchOnlyBalance() const;
    CAmount GetLegacyBalance(const isminefilter& filter, int minDepth, const std::string* account) const;
    CAmount GetAvailableBalance(const CCoinControl* coinControl = nullptr) const;

    bool FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, int& nChangePosInOut, std::string& strFailReason, bool lockUnspents, const std::set<int>& setSubtractFeeFromOutputs, CCoinControl);
    bool SignTransaction(CMutableTransaction& tx);

    bool CreateTransaction(const std::vector<CRecipient>& vecSend, CWalletTx& wtxNew, CReserveKey& reservekey, CAmount& nFeeRet, int& nChangePosInOut,
                           std::string& strFailReason, const CCoinControl& coin_control, bool sign = true, CAmount nGasFee=0, bool hasSender=false);
    bool CommitTransaction(CWalletTx& wtxNew, CReserveKey& reservekey, CConnman* connman, CValidationState& state);

    void ListAccountCreditDebit(const std::string& strAccount, std::list<CAccountingEntry>& entries);
    bool AddAccountingEntry(const CAccountingEntry&);
    bool AddAccountingEntry(const CAccountingEntry&, CWalletDB *pwalletdb);
    template <typename ContainerType>
    bool DummySignTx(CMutableTransaction &txNew, const ContainerType &coins) const;

    static CFeeRate minTxFee;
    static CFeeRate fallbackFee;
    static CFeeRate m_discard_rate;
    static CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc);
    static CAmount GetRequiredFee(unsigned int nTxBytes);

    bool NewKeyPool();
    size_t KeypoolCountExternalKeys();
    bool TopUpKeyPool(unsigned int kpSize = 0);
    void ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fRequestedInternal);
    void KeepKey(int64_t nIndex);
    void ReturnKey(int64_t nIndex, bool fInternal, const CPubKey& pubkey);
    bool GetKeyFromPool(CPubKey &key, bool internal = false);
    int64_t GetOldestKeyPoolTime();
    void MarkReserveKeysAsUsed(int64_t keypool_id);
    const std::map<CKeyID, int64_t>& GetAllReserveKeys() const { return m_pool_key_to_index; }

    std::set< std::set<CTxDestination> > GetAddressGroupings();
    std::map<CTxDestination, CAmount> GetAddressBalances();

    std::set<CTxDestination> GetAccountAddresses(const std::string& strAccount) const;

    isminetype IsMine(const CTxIn& txin) const;
    CAmount GetDebit(const CTxIn& txin, const isminefilter& filter) const;
    isminetype IsMine(const CTxOut& txout) const;
    CAmount GetCredit(const CTxOut& txout, const isminefilter& filter) const;
    bool IsChange(const CTxOut& txout) const;
    CAmount GetChange(const CTxOut& txout) const;
    bool IsMine(const CTransaction& tx) const;
    bool IsFromMe(const CTransaction& tx) const;
    CAmount GetDebit(const CTransaction& tx, const isminefilter& filter) const;
    bool IsAllFromMe(const CTransaction& tx, const isminefilter& filter) const;
    CAmount GetCredit(const CTransaction& tx, const isminefilter& filter) const;
    CAmount GetChange(const CTransaction& tx) const;
    void SetBestChain(const CBlockLocator& loc) override;

    DBErrors LoadWallet(bool& fFirstRunRet);
    DBErrors ZapWalletTx(std::vector<CWalletTx>& vWtx);
    DBErrors ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256>& vHashOut);

    bool SetAddressBook(const CTxDestination& address, const std::string& strName, const std::string& purpose);

    bool DelAddressBook(const CTxDestination& address);

    const std::string& GetAccountName(const CScript& scriptPubKey) const;

    bool SetContractBook(const std::string& strAddress, const std::string& strName, const std::string& strAbi);

    bool DelContractBook(const std::string& strAddress);

    void Inventory(const uint256 &hash) override
    {
        {
            LOCK(cs_wallet);
            std::map<uint256, int>::iterator mi = mapRequestCount.find(hash);
            if (mi != mapRequestCount.end())
                (*mi).second++;
        }
    }

    void GetScriptForMining(std::shared_ptr<CReserveScript> &script);
    void ResetRequestCount(const uint256 &hash)
    {
        LOCK(cs_wallet);
        mapRequestCount[hash] = 0;
    };
   
    unsigned int GetKeyPoolSize()
    {
        AssertLockHeld(cs_wallet); // set{Ex,In}ternalKeyPool
        return setInternalKeyPool.size() + setExternalKeyPool.size();
    }

    bool SetDefaultKey(const CPubKey &vchPubKey);

    bool SetMinVersion(enum WalletFeature, CWalletDB* pwalletdbIn = nullptr, bool fExplicit = false);

    bool SetMaxVersion(int nVersion);

    int GetVersion() { LOCK(cs_wallet); return nWalletVersion; }

    std::set<uint256> GetConflicts(const uint256& txid) const;

    bool HasWalletSpend(const uint256& txid) const;

    void Flush(bool shutdown=false);

    //  This function will perform salvage on the wallet if requested, as long as only one wallet is
    //  being loaded (CWallet::ParameterInteraction forbids -salvagewallet, -zapwallettxes or -upgradewallet with multiwallet).
    static bool Verify();
    
    boost::signals2::signal<void (CWallet *wallet, const CTxDestination
            &address, const std::string &label, bool isMine,
            const std::string &purpose,
            ChangeType status)> NotifyAddressBookChanged;

    boost::signals2::signal<void (CWallet *wallet, const uint256 &hashTx,
            ChangeType status)> NotifyTransactionChanged;

    boost::signals2::signal<void (CWallet *wallet, const uint256 &hashTx,
            ChangeType status)> NotifyTokenTransactionChanged;

    boost::signals2::signal<void (const std::string &title, int nProgress)> ShowProgress;

    boost::signals2::signal<void (bool fHaveWatchOnly)> NotifyWatchonlyChanged;

    boost::signals2::signal<void (CWallet *wallet, const uint256 &hashToken,
            ChangeType status)> NotifyTokenChanged;

    boost::signals2::signal<void (CWallet *wallet, const std::string &address,
            const std::string &label, const std::string &abi,
            ChangeType status)> NotifyContractBookChanged;

    bool GetBroadcastTransactions() const { return fBroadcastTransactions; }
    void SetBroadcastTransactions(bool broadcast) { fBroadcastTransactions = broadcast; }

    bool TransactionCanBeAbandoned(const uint256& hashTx) const;

    /* Mark a transaction (and it in-wallet descendants) as abandoned so its inputs may be respent. */
    bool AbandonTransaction(const uint256& hashTx);

    bool MarkReplaced(const uint256& originalHash, const uint256& newHash);

    /* Returns the wallets help message */
    static std::string GetWalletHelpString(bool showDebug);

    /* Initializes the wallet, returns a new CWallet instance or a null pointer in case of an error */
    static CWallet* CreateWalletFromFile(const std::string walletFile);
    static bool InitLoadWallet();

    void postInitProcess(CScheduler& scheduler);

    /* Wallets parameter interaction */
    static bool ParameterInteraction();

    bool BackupWallet(const std::string& strDest);

    /* Set the HD chain model (chain child index counters) */
    bool SetHDChain(const CHDChain& chain, bool memonly);
    const CHDChain& GetHDChain() const { return hdChain; }

    /* Returns true if HD is enabled */
    bool IsHDEnabled() const;

    /* Generates a new HD master key (will not be activated) */
    CPubKey GenerateNewHDMasterKey();
    
    /* Set the current HD master key (will reset the chain child index counters)
       Sets the master key's version based on the current wallet version (so the
       caller must ensure the current wallet version is correct before calling
       this function). */
    bool SetHDMasterKey(const CPubKey& key);

    /* Add token entry into the wallet */
    bool AddTokenEntry(const CTokenInfo& token, bool fFlushOnClose=true);

    /* Add token tx entry into the wallet */
    bool AddTokenTxEntry(const CTokenTx& tokenTx, bool fFlushOnClose=true);

    /* Get details token tx entry into the wallet */
    bool GetTokenTxDetails(const CTokenTx &wtx, uint256& credit, uint256& debit, std::string& tokenSymbol, uint8_t& decimals) const;

    /* Check if token transaction is mine */
    bool IsTokenTxMine(const CTokenTx &wtx) const;

    /* Remove token entry from the wallet */
    bool RemoveTokenEntry(const uint256& tokenHash, bool fFlushOnClose=true);
};

class CReserveKey : public CReserveScript
{
protected:
    CWallet* pwallet;
    int64_t nIndex;
    CPubKey vchPubKey;
    bool fInternal;
public:
    CReserveKey(CWallet* pwalletIn)
    {
        nIndex = -1;
        pwallet = pwalletIn;
        fInternal = false;
    }

    CReserveKey() = default;
    CReserveKey(const CReserveKey&) = delete;
    CReserveKey& operator=(const CReserveKey&) = delete;

    ~CReserveKey()
    {
        ReturnKey();
    }

    void ReturnKey();
    bool GetReservedKey(CPubKey &pubkey, bool internal = false);
    void KeepKey();
    void KeepScript() override { KeepKey(); }
};


class CAccount
{
public:
    CPubKey vchPubKey;

    CAccount()
    {
        SetNull();
    }

    void SetNull()
    {
        vchPubKey = CPubKey();
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        int nVersion = s.GetVersion();
        if (!(s.GetType() & SER_GETHASH))
            READWRITE(nVersion);
        READWRITE(vchPubKey);
    }
};

// Helper for producing a bunch of max-sized low-S signatures (eg 72 bytes)
// ContainerType is meant to hold pair<CWalletTx *, int>, and be iterable
// so that each entry corresponds to each vIn, in order.
template <typename ContainerType>
bool CWallet::DummySignTx(CMutableTransaction &txNew, const ContainerType &coins) const
{
    // Fill in dummy signatures for fee calculation.
    int nIn = 0;
    for (const auto& coin : coins)
    {
        const CScript& scriptPubKey = coin.txout.scriptPubKey;
        SignatureData sigdata;

        if (!ProduceSignature(DummySignatureCreator(this), scriptPubKey, sigdata))
        {
            return false;
        } else {
            UpdateTransaction(txNew, nIn, sigdata);
        }

        nIn++;
    }
    return true;
}

class CTokenInfo
{
public:
    static const int CURRENT_VERSION=1;
    int nVersion;
    std::string strContractAddress;
    std::string strTokenName;
    std::string strTokenSymbol;
    uint8_t nDecimals;
    std::string strSenderAddress;

    // Wallet data for token transaction
    int64_t nCreateTime;
    uint256 blockHash;
    int64_t blockNumber;

    CTokenInfo()
    {
        SetNull();
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        if (!(s.GetType() & SER_GETHASH))
        {
            READWRITE(nVersion);
            READWRITE(nCreateTime);
            READWRITE(strTokenName);
            READWRITE(strTokenSymbol);
            READWRITE(blockHash);
            READWRITE(blockNumber);
        }
        READWRITE(nDecimals);
        READWRITE(strContractAddress);
        READWRITE(strSenderAddress);
    }

    void SetNull()
    {
        nVersion = CTokenInfo::CURRENT_VERSION;
        nCreateTime = 0;
        strContractAddress = "";
        strTokenName = "";
        strTokenSymbol = "";
        nDecimals = 0;
        strSenderAddress = "";
        blockHash.SetNull();
        blockNumber = -1;
    }

    uint256 GetHash() const;
};

class CTokenTx
{
public:
    static const int CURRENT_VERSION=1;
    int nVersion;
    std::string strContractAddress;
    std::string strSenderAddress;
    std::string strReceiverAddress;
    uint256 nValue;
    uint256 transactionHash;

    // Wallet data for token transaction
    int64_t nCreateTime;
    uint256 blockHash;
    int64_t blockNumber;
    std::string strLabel;

    CTokenTx()
    {
        SetNull();
    }

    ADD_SERIALIZE_METHODS;

    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        if (!(s.GetType() & SER_GETHASH))
        {
            READWRITE(nVersion);
            READWRITE(nCreateTime);
            READWRITE(blockHash);
            READWRITE(blockNumber);
            READWRITE(LIMITED_STRING(strLabel, 65536));
        }
        READWRITE(strContractAddress);
        READWRITE(strSenderAddress);
        READWRITE(strReceiverAddress);
        READWRITE(nValue);
        READWRITE(transactionHash);
    }

    void SetNull()
    {
        nVersion = CTokenTx::CURRENT_VERSION;
        nCreateTime = 0;
        strContractAddress = "";
        strSenderAddress = "";
        strReceiverAddress = "";
        nValue.SetNull();
        transactionHash.SetNull();
        blockHash.SetNull();
        blockNumber = -1;
        strLabel = "";
    }

    uint256 GetHash() const;
};

class CContractBookData
{
public:
    std::string name;
    std::string abi;

    CContractBookData()
    {}
};

#endif // FABCOIN_WALLET_WALLET_H