// Copyright (c) 2018-2022 The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <interfaces/wallet.h>

#include <common/args.h>

#include <consensus/amount.h>

#include <interfaces/chain.h>

#include <interfaces/handler.h>

#include <node/types.h>

#include <policy/fees.h>

#include <primitives/transaction.h>

#include <rpc/server.h>

#include <scheduler.h>

#include <support/allocators/secure.h>

#include <sync.h>

#include <uint256.h>

#include <util/check.h>

#include <util/translation.h>

#include <util/ui_change_type.h>

#include <wallet/coincontrol.h>

#include <wallet/context.h>

#include <wallet/feebumper.h>

#include <wallet/fees.h>

#include <wallet/types.h>

#include <wallet/load.h>

#include <wallet/receive.h>

#include <wallet/rpc/wallet.h>

#include <wallet/spend.h>

#include <wallet/wallet.h>

#include <memory>

#include <string>

#include <utility>

#include <vector>

using common::PSBTError;

using interfaces::Chain;

using interfaces::FoundBlock;

using interfaces::Handler;

using interfaces::MakeSignalHandler;

using interfaces::Wallet;

using interfaces::WalletAddress;

using interfaces::WalletBalances;

using interfaces::WalletLoader;

using interfaces::WalletMigrationResult;

using interfaces::WalletOrderForm;

using interfaces::WalletTx;

using interfaces::WalletTxOut;

using interfaces::WalletTxStatus;

using interfaces::WalletValueMap;

namespace wallet {

// All members of the classes in this namespace are intentionally public, as the

// classes themselves are private.

namespace {

//! Construct wallet tx struct.

WalletTx MakeWalletTx(CWallet& wallet, const CWalletTx& wtx)

{

    LOCK(wallet.cs_wallet);

    WalletTx result;

    result.tx = wtx.tx;

    result.txin_is_mine.reserve(wtx.tx->vin.size());

    for (const auto& txin : wtx.tx->vin) {

        result.txin_is_mine.emplace_back(InputIsMine(wallet, txin));

    }

    result.txout_is_mine.reserve(wtx.tx->vout.size());

    result.txout_address.reserve(wtx.tx->vout.size());

    result.txout_address_is_mine.reserve(wtx.tx->vout.size());

    for (const auto& txout : wtx.tx->vout) {

        result.txout_is_mine.emplace_back(wallet.IsMine(txout));

        result.txout_is_change.push_back(OutputIsChange(wallet, txout));

        result.txout_address.emplace_back();

        result.txout_address_is_mine.emplace_back(ExtractDestination(txout.scriptPubKey, result.txout_address.back()) ?

                                                      wallet.IsMine(result.txout_address.back()) :

                                                      ISMINE_NO);

    }

    result.credit = CachedTxGetCredit(wallet, wtx, ISMINE_ALL);

    result.debit = CachedTxGetDebit(wallet, wtx, ISMINE_ALL);

    result.change = CachedTxGetChange(wallet, wtx);

    result.time = wtx.GetTxTime();

    result.value_map = wtx.mapValue;

    result.is_coinbase = wtx.IsCoinBase();

    return result;

}

//! Construct wallet tx status struct.

WalletTxStatus MakeWalletTxStatus(const CWallet& wallet, const CWalletTx& wtx)

    EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)

{

    AssertLockHeld(wallet.cs_wallet);

    WalletTxStatus result;

    result.block_height =

        wtx.state<TxStateConfirmed>() ? wtx.state<TxStateConfirmed>()->confirmed_block_height :

        wtx.state<TxStateBlockConflicted>() ? wtx.state<TxStateBlockConflicted>()->conflicting_block_height :

        std::numeric_limits<int>::max();

    result.blocks_to_maturity = wallet.GetTxBlocksToMaturity(wtx);

    result.depth_in_main_chain = wallet.GetTxDepthInMainChain(wtx);

    result.time_received = wtx.nTimeReceived;

    result.lock_time = wtx.tx->nLockTime;

    result.is_trusted = CachedTxIsTrusted(wallet, wtx);

    result.is_abandoned = wtx.isAbandoned();

    result.is_coinbase = wtx.IsCoinBase();

    result.is_in_main_chain = wtx.isConfirmed();

    return result;

}

//! Construct wallet TxOut struct.

WalletTxOut MakeWalletTxOut(const CWallet& wallet,

    const CWalletTx& wtx,

    int n,

    int depth) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)

{

    WalletTxOut result;

    result.txout = wtx.tx->vout[n];

    result.time = wtx.GetTxTime();

    result.depth_in_main_chain = depth;

    result.is_spent = wallet.IsSpent(COutPoint(wtx.GetHash(), n));

    return result;

}

WalletTxOut MakeWalletTxOut(const CWallet& wallet,

    const COutput& output) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)

{

    WalletTxOut result;

    result.txout = output.txout;

    result.time = output.time;

    result.depth_in_main_chain = output.depth;

    result.is_spent = wallet.IsSpent(output.outpoint);

    return result;

}

class WalletImpl : public Wallet

{

public:

    explicit WalletImpl(WalletContext& context, const std::shared_ptr<CWallet>& wallet) : m_context(context), m_wallet(wallet) {}

    bool encryptWallet(const SecureString& wallet_passphrase) override

    {

        return m_wallet->EncryptWallet(wallet_passphrase);

    }

    bool isCrypted() override { return m_wallet->IsCrypted(); }

    bool lock() override { return m_wallet->Lock(); }

    bool unlock(const SecureString& wallet_passphrase) override { return m_wallet->Unlock(wallet_passphrase); }

    bool isLocked() override { return m_wallet->IsLocked(); }

    bool changeWalletPassphrase(const SecureString& old_wallet_passphrase,

        const SecureString& new_wallet_passphrase) override

    {

        return m_wallet->ChangeWalletPassphrase(old_wallet_passphrase, new_wallet_passphrase);

    }

    void abortRescan() override { m_wallet->AbortRescan(); }

    bool backupWallet(const std::string& filename) override { return m_wallet->BackupWallet(filename); }

    std::string getWalletName() override { return m_wallet->GetName(); }

    util::Result<CTxDestination> getNewDestination(const OutputType type, const std::string& label) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->GetNewDestination(type, label);

    }

    bool getPubKey(const CScript& script, const CKeyID& address, CPubKey& pub_key) override

    {

        std::unique_ptr<SigningProvider> provider = m_wallet->GetSolvingProvider(script);

        if (provider) {

            return provider->GetPubKey(address, pub_key);

        }

        return false;

    }

    SigningResult signMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) override

    {

        return m_wallet->SignMessage(message, pkhash, str_sig);

    }

    bool isSpendable(const CTxDestination& dest) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->IsMine(dest) & ISMINE_SPENDABLE;

    }

    bool haveWatchOnly() override

    {

        auto spk_man = m_wallet->GetLegacyScriptPubKeyMan();

        if (spk_man) {

            return spk_man->HaveWatchOnly();

        }

        return false;

    };

    bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::optional<AddressPurpose>& purpose) override

    {

        return m_wallet->SetAddressBook(dest, name, purpose);

    }

    bool delAddressBook(const CTxDestination& dest) override

    {

        return m_wallet->DelAddressBook(dest);

    }

    bool getAddress(const CTxDestination& dest,

        std::string* name,

        isminetype* is_mine,

        AddressPurpose* purpose) override

    {

        LOCK(m_wallet->cs_wallet);

        const auto& entry = m_wallet->FindAddressBookEntry(dest, /*allow_change=*/false);

        if (!entry) return false; // addr not found

        if (name) {

            *name = entry->GetLabel();

        }

        std::optional<isminetype> dest_is_mine;

        if (is_mine || purpose) {

            dest_is_mine = m_wallet->IsMine(dest);

        }

        if (is_mine) {

            *is_mine = *dest_is_mine;

        }

        if (purpose) {

            // In very old wallets, address purpose may not be recorded so we derive it from IsMine

            *purpose = entry->purpose.value_or(*dest_is_mine ? AddressPurpose::RECEIVE : AddressPurpose::SEND);

        }

        return true;

    }

    std::vector<WalletAddress> getAddresses() override

    {

        LOCK(m_wallet->cs_wallet);

        std::vector<WalletAddress> result;

        m_wallet->ForEachAddrBookEntry([&](const CTxDestination& dest, const std::string& label, bool is_change, const std::optional<AddressPurpose>& purpose) EXCLUSIVE_LOCKS_REQUIRED(m_wallet->cs_wallet) {

            if (is_change) return;

            isminetype is_mine = m_wallet->IsMine(dest);

            // In very old wallets, address purpose may not be recorded so we derive it from IsMine

            result.emplace_back(dest, is_mine, purpose.value_or(is_mine ? AddressPurpose::RECEIVE : AddressPurpose::SEND), label);

        });

        return result;

    }

    std::vector<std::string> getAddressReceiveRequests() override {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->GetAddressReceiveRequests();

    }

    bool setAddressReceiveRequest(const CTxDestination& dest, const std::string& id, const std::string& value) override {

        // Note: The setAddressReceiveRequest interface used by the GUI to store

        // receive requests is a little awkward and could be improved in the

        // future:

        //

        // - The same method is used to save requests and erase them, but

        //   having separate methods could be clearer and prevent bugs.

        //

        // - Request ids are passed as strings even though they are generated as

        //   integers.

        //

        // - Multiple requests can be stored for the same address, but it might

        //   be better to only allow one request or only keep the current one.

        LOCK(m_wallet->cs_wallet);

        WalletBatch batch{m_wallet->GetDatabase()};

        return value.empty() ? m_wallet->EraseAddressReceiveRequest(batch, dest, id)

                             : m_wallet->SetAddressReceiveRequest(batch, dest, id, value);

    }

    util::Result<void> displayAddress(const CTxDestination& dest) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->DisplayAddress(dest);

    }

    bool lockCoin(const COutPoint& output, const bool write_to_db) override

    {

        LOCK(m_wallet->cs_wallet);

        std::unique_ptr<WalletBatch> batch = write_to_db ? std::make_unique<WalletBatch>(m_wallet->GetDatabase()) : nullptr;

        return m_wallet->LockCoin(output, batch.get());

    }

    bool unlockCoin(const COutPoint& output) override

    {

        LOCK(m_wallet->cs_wallet);

        std::unique_ptr<WalletBatch> batch = std::make_unique<WalletBatch>(m_wallet->GetDatabase());

        return m_wallet->UnlockCoin(output, batch.get());

    }

    bool isLockedCoin(const COutPoint& output) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->IsLockedCoin(output);

    }

    void listLockedCoins(std::vector<COutPoint>& outputs) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->ListLockedCoins(outputs);

    }

    util::Result<CTransactionRef> createTransaction(const std::vector<CRecipient>& recipients,

        const CCoinControl& coin_control,

        bool sign,

        int& change_pos,

        CAmount& fee) override

    {

        LOCK(m_wallet->cs_wallet);

        auto res = CreateTransaction(*m_wallet, recipients, change_pos == -1 ? std::nullopt : std::make_optional(change_pos),

                                     coin_control, sign);

        if (!res) return util::Error{util::ErrorString(res)};

        const auto& txr = *res;

        fee = txr.fee;

        change_pos = txr.change_pos ? int(*txr.change_pos) : -1;

        return txr.tx;

    }

    void commitTransaction(CTransactionRef tx,

        WalletValueMap value_map,

        WalletOrderForm order_form) override

    {

        LOCK(m_wallet->cs_wallet);

        m_wallet->CommitTransaction(std::move(tx), std::move(value_map), std::move(order_form));

    }

    bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet->TransactionCanBeAbandoned(txid); }

    bool abandonTransaction(const uint256& txid) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->AbandonTransaction(txid);

    }

    bool transactionCanBeBumped(const uint256& txid) override

    {

        return feebumper::TransactionCanBeBumped(*m_wallet.get(), txid);

    }

    bool createBumpTransaction(const uint256& txid,

        const CCoinControl& coin_control,

        std::vector<bilingual_str>& errors,

        CAmount& old_fee,

        CAmount& new_fee,

        CMutableTransaction& mtx) override

    {

        std::vector<CTxOut> outputs; // just an empty list of new recipients for now

        return feebumper::CreateRateBumpTransaction(*m_wallet.get(), txid, coin_control, errors, old_fee, new_fee, mtx, /* require_mine= */ true, outputs) == feebumper::Result::OK;

    }

    bool signBumpTransaction(CMutableTransaction& mtx) override { return feebumper::SignTransaction(*m_wallet.get(), mtx); }

    bool commitBumpTransaction(const uint256& txid,

        CMutableTransaction&& mtx,

        std::vector<bilingual_str>& errors,

        uint256& bumped_txid) override

    {

        return feebumper::CommitTransaction(*m_wallet.get(), txid, std::move(mtx), errors, bumped_txid) ==

               feebumper::Result::OK;

    }

    CTransactionRef getTx(const uint256& txid) override

    {

        LOCK(m_wallet->cs_wallet);

        auto mi = m_wallet->mapWallet.find(txid);

        if (mi != m_wallet->mapWallet.end()) {

            return mi->second.tx;

        }

        return {};

    }

    WalletTx getWalletTx(const uint256& txid) override

    {

        LOCK(m_wallet->cs_wallet);

        auto mi = m_wallet->mapWallet.find(txid);

        if (mi != m_wallet->mapWallet.end()) {

            return MakeWalletTx(*m_wallet, mi->second);

        }

        return {};

    }

    std::set<WalletTx> getWalletTxs() override

    {

        LOCK(m_wallet->cs_wallet);

        std::set<WalletTx> result;

        for (const auto& entry : m_wallet->mapWallet) {

            result.emplace(MakeWalletTx(*m_wallet, entry.second));

        }

        return result;

    }

    bool tryGetTxStatus(const uint256& txid,

        interfaces::WalletTxStatus& tx_status,

        int& num_blocks,

        int64_t& block_time) override

    {

        TRY_LOCK(m_wallet->cs_wallet, locked_wallet);

        if (!locked_wallet) {

            return false;

        }

        auto mi = m_wallet->mapWallet.find(txid);

        if (mi == m_wallet->mapWallet.end()) {

            return false;

        }

        num_blocks = m_wallet->GetLastBlockHeight();

        block_time = -1;

        CHECK_NONFATAL(m_wallet->chain().findBlock(m_wallet->GetLastBlockHash(), FoundBlock().time(block_time)));

        tx_status = MakeWalletTxStatus(*m_wallet, mi->second);

        return true;

    }

    WalletTx getWalletTxDetails(const uint256& txid,

        WalletTxStatus& tx_status,

        WalletOrderForm& order_form,

        bool& in_mempool,

        int& num_blocks) override

    {

        LOCK(m_wallet->cs_wallet);

        auto mi = m_wallet->mapWallet.find(txid);

        if (mi != m_wallet->mapWallet.end()) {

            num_blocks = m_wallet->GetLastBlockHeight();

            in_mempool = mi->second.InMempool();

            order_form = mi->second.vOrderForm;

            tx_status = MakeWalletTxStatus(*m_wallet, mi->second);

            return MakeWalletTx(*m_wallet, mi->second);

        }

        return {};

    }

    std::optional<PSBTError> fillPSBT(int sighash_type,

        bool sign,

        bool bip32derivs,

        size_t* n_signed,

        PartiallySignedTransaction& psbtx,

        bool& complete) override

    {

        return m_wallet->FillPSBT(psbtx, complete, sighash_type, sign, bip32derivs, n_signed);

    }

    WalletBalances getBalances() override

    {

        const auto bal = GetBalance(*m_wallet);

        WalletBalances result;

        result.balance = bal.m_mine_trusted;

        result.unconfirmed_balance = bal.m_mine_untrusted_pending;

        result.immature_balance = bal.m_mine_immature;

        result.have_watch_only = haveWatchOnly();

        if (result.have_watch_only) {

            result.watch_only_balance = bal.m_watchonly_trusted;

            result.unconfirmed_watch_only_balance = bal.m_watchonly_untrusted_pending;

            result.immature_watch_only_balance = bal.m_watchonly_immature;

        }

        return result;

    }

    bool tryGetBalances(WalletBalances& balances, uint256& block_hash) override

    {

        TRY_LOCK(m_wallet->cs_wallet, locked_wallet);

        if (!locked_wallet) {

            return false;

        }

        block_hash = m_wallet->GetLastBlockHash();

        balances = getBalances();

        return true;

    }

    CAmount getBalance() override { return GetBalance(*m_wallet).m_mine_trusted; }

    CAmount getAvailableBalance(const CCoinControl& coin_control) override

    {

        LOCK(m_wallet->cs_wallet);

        CAmount total_amount = 0;

        // Fetch selected coins total amount

        if (coin_control.HasSelected()) {

            FastRandomContext rng{};

            CoinSelectionParams params(rng);

            // Note: for now, swallow any error.

            if (auto res = FetchSelectedInputs(*m_wallet, coin_control, params)) {

                total_amount += res->total_amount;

            }

        }

        // And fetch the wallet available coins

        if (coin_control.m_allow_other_inputs) {

            total_amount += AvailableCoins(*m_wallet, &coin_control).GetTotalAmount();

        }

        return total_amount;

    }

    isminetype txinIsMine(const CTxIn& txin) override

    {

        LOCK(m_wallet->cs_wallet);

        return InputIsMine(*m_wallet, txin);

    }

    isminetype txoutIsMine(const CTxOut& txout) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->IsMine(txout);

    }

    CAmount getDebit(const CTxIn& txin, isminefilter filter) override

    {

        LOCK(m_wallet->cs_wallet);

        return m_wallet->GetDebit(txin, filter);

    }

    CAmount getCredit(const CTxOut& txout, isminefilter filter) override

    {

        LOCK(m_wallet->cs_wallet);

        return OutputGetCredit(*m_wallet, txout, filter);

    }

    CoinsList listCoins() override

    {

        LOCK(m_wallet->cs_wallet);

        CoinsList result;

        for (const auto& entry : ListCoins(*m_wallet)) {

            auto& group = result[entry.first];

            for (const auto& coin : entry.second) {

                group.emplace_back(coin.outpoint,

                    MakeWalletTxOut(*m_wallet, coin));

            }

        }

        return result;

    }

    std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) override

    {

        LOCK(m_wallet->cs_wallet);

        std::vector<WalletTxOut> result;

        result.reserve(outputs.size());

        for (const auto& output : outputs) {

            result.emplace_back();

            auto it = m_wallet->mapWallet.find(output.hash);

            if (it != m_wallet->mapWallet.end()) {

                int depth = m_wallet->GetTxDepthInMainChain(it->second);

                if (depth >= 0) {

                    result.back() = MakeWalletTxOut(*m_wallet, it->second, output.n, depth);

                }

            }

        }

        return result;

    }

    CAmount getRequiredFee(unsigned int tx_bytes) override { return GetRequiredFee(*m_wallet, tx_bytes); }

    CAmount getMinimumFee(unsigned int tx_bytes,

        const CCoinControl& coin_control,

        int* returned_target,

        FeeReason* reason) override

    {

        FeeCalculation fee_calc;

        CAmount result;

        result = GetMinimumFee(*m_wallet, tx_bytes, coin_control, &fee_calc);

        if (returned_target) *returned_target = fee_calc.returnedTarget;

        if (reason) *reason = fee_calc.reason;

        return result;

    }

    unsigned int getConfirmTarget() override { return m_wallet->m_confirm_target; }

    bool hdEnabled() override { return m_wallet->IsHDEnabled(); }

    bool canGetAddresses() override { return m_wallet->CanGetAddresses(); }

    bool hasExternalSigner() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER); }

    bool privateKeysDisabled() override { return m_wallet->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS); }

    bool taprootEnabled() override {

        if (m_wallet->IsLegacy()) return false;

        auto spk_man = m_wallet->GetScriptPubKeyMan(OutputType::BECH32M, /*internal=*/false);

        return spk_man != nullptr;

    }

    OutputType getDefaultAddressType() override { return m_wallet->m_default_address_type; }

    CAmount getDefaultMaxTxFee() override { return m_wallet->m_default_max_tx_fee; }

    void remove() override

    {

        RemoveWallet(m_context, m_wallet, /*load_on_start=*/false);

    }

    bool isLegacy() override { return m_wallet->IsLegacy(); }

    std::unique_ptr<Handler> handleUnload(UnloadFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyUnload.connect(fn));

    }

    std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override

    {

        return MakeSignalHandler(m_wallet->ShowProgress.connect(fn));

    }

    std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyStatusChanged.connect([fn](CWallet*) { fn(); }));

    }

    std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyAddressBookChanged.connect(

            [fn](const CTxDestination& address, const std::string& label, bool is_mine,

                 AddressPurpose purpose, ChangeType status) { fn(address, label, is_mine, purpose, status); }));

    }

    std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyTransactionChanged.connect(

            [fn](const uint256& txid, ChangeType status) { fn(txid, status); }));

    }

    std::unique_ptr<Handler> handleWatchOnlyChanged(WatchOnlyChangedFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyWatchonlyChanged.connect(fn));

    }

    std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override

    {

        return MakeSignalHandler(m_wallet->NotifyCanGetAddressesChanged.connect(fn));

    }

    CWallet* wallet() override { return m_wallet.get(); }

    WalletContext& m_context;

    std::shared_ptr<CWallet> m_wallet;

};

class WalletLoaderImpl : public WalletLoader

{

public:

    WalletLoaderImpl(Chain& chain, ArgsManager& args)

    {

        m_context.chain = &chain;

        m_context.args = &args;

    }

    ~WalletLoaderImpl() override { UnloadWallets(m_context); }

    //! ChainClient methods

    void registerRpcs() override

    {

        for (const CRPCCommand& command : GetWalletRPCCommands()) {

            m_rpc_commands.emplace_back(command.category, command.name, [this, &command](const JSONRPCRequest& request, UniValue& result, bool last_handler) {

                JSONRPCRequest wallet_request = request;

                wallet_request.context = &m_context;

                return command.actor(wallet_request, result, last_handler);

            }, command.argNames, command.unique_id);

            m_rpc_handlers.emplace_back(m_context.chain->handleRpc(m_rpc_commands.back()));

        }

    }

    bool verify() override { return VerifyWallets(m_context); }

    bool load() override { return LoadWallets(m_context); }

    void start(CScheduler& scheduler) override

    {

        m_context.scheduler = &scheduler;

        return StartWallets(m_context);

    }

    void flush() override { return FlushWallets(m_context); }

    void stop() override { return StopWallets(m_context); }

    void setMockTime(int64_t time) override { return SetMockTime(time); }

    void schedulerMockForward(std::chrono::seconds delta) override { Assert(m_context.scheduler)->MockForward(delta); }

    //! WalletLoader methods

    util::Result<std::unique_ptr<Wallet>> createWallet(const std::string& name, const SecureString& passphrase, uint64_t wallet_creation_flags, std::vector<bilingual_str>& warnings) override

    {

        DatabaseOptions options;

        DatabaseStatus status;

        ReadDatabaseArgs(*m_context.args, options);

        options.require_create = true;

        options.create_flags = wallet_creation_flags;

        options.create_passphrase = passphrase;

        bilingual_str error;

        std::unique_ptr<Wallet> wallet{MakeWallet(m_context, CreateWallet(m_context, name, /*load_on_start=*/true, options, status, error, warnings))};

        if (wallet) {

            return wallet;

        } else {

            return util::Error{error};

        }

    }

    util::Result<std::unique_ptr<Wallet>> loadWallet(const std::string& name, std::vector<bilingual_str>& warnings) override

    {

        DatabaseOptions options;

        DatabaseStatus status;

        ReadDatabaseArgs(*m_context.args, options);

        options.require_existing = true;

        bilingual_str error;

        std::unique_ptr<Wallet> wallet{MakeWallet(m_context, LoadWallet(m_context, name, /*load_on_start=*/true, options, status, error, warnings))};

        if (wallet) {

            return wallet;

        } else {

            return util::Error{error};

        }

    }

    util::Result<std::unique_ptr<Wallet>> restoreWallet(const fs::path& backup_file, const std::string& wallet_name, std::vector<bilingual_str>& warnings) override

    {

        DatabaseStatus status;

        bilingual_str error;

        std::unique_ptr<Wallet> wallet{MakeWallet(m_context, RestoreWallet(m_context, backup_file, wallet_name, /*load_on_start=*/true, status, error, warnings))};

        if (wallet) {

            return wallet;

        } else {

            return util::Error{error};

        }

    }

    util::Result<WalletMigrationResult> migrateWallet(const std::string& name, const SecureString& passphrase) override

    {

        auto res = wallet::MigrateLegacyToDescriptor(name, passphrase, m_context);

        if (!res) return util::Error{util::ErrorString(res)};

        WalletMigrationResult out{

            .wallet = MakeWallet(m_context, res->wallet),

            .watchonly_wallet_name = res->watchonly_wallet ? std::make_optional(res->watchonly_wallet->GetName()) : std::nullopt,

            .solvables_wallet_name = res->solvables_wallet ? std::make_optional(res->solvables_wallet->GetName()) : std::nullopt,

            .backup_path = res->backup_path,

        };

        return out;

    }

    bool isEncrypted(const std::string& wallet_name) override

    {

        auto wallets{GetWallets(m_context)};

        auto it = std::find_if(wallets.begin(), wallets.end(), [&](std::shared_ptr<CWallet> w){ return w->GetName() == wallet_name; });

        if (it != wallets.end()) return (*it)->IsCrypted();

        // Unloaded wallet, read db

        DatabaseOptions options;

        options.require_existing = true;

        DatabaseStatus status;

        bilingual_str error;

        auto db = MakeWalletDatabase(wallet_name, options, status, error);

        if (!db) return false;

        return WalletBatch(*db).IsEncrypted();

    }

    std::string getWalletDir() override

    {

        return fs::PathToString(GetWalletDir());

    }

    std::vector<std::pair<std::string, std::string>> listWalletDir() override

    {

        std::vector<std::pair<std::string, std::string>> paths;

        for (auto& [path, format] : ListDatabases(GetWalletDir())) {

            paths.emplace_back(fs::PathToString(path), format);

        }

        return paths;

    }

    std::vector<std::unique_ptr<Wallet>> getWallets() override

    {

        std::vector<std::unique_ptr<Wallet>> wallets;

        for (const auto& wallet : GetWallets(m_context)) {

            wallets.emplace_back(MakeWallet(m_context, wallet));

        }

        return wallets;

    }

    std::unique_ptr<Handler> handleLoadWallet(LoadWalletFn fn) override

    {

        return HandleLoadWallet(m_context, std::move(fn));

    }

    WalletContext* context() override  { return &m_context; }

    WalletContext m_context;

    const std::vector<std::string> m_wallet_filenames;

    std::vector<std::unique_ptr<Handler>> m_rpc_handlers;

    std::list<CRPCCommand> m_rpc_commands;

};

} // namespace

} // namespace wallet

namespace interfaces {

std::unique_ptr<Wallet> MakeWallet(wallet::WalletContext& context, const std::shared_ptr<wallet::CWallet>& wallet) { return wallet ? std::make_unique<wallet::WalletImpl>(context, wallet) : nullptr; }

std::unique_ptr<WalletLoader> MakeWalletLoader(Chain& chain, ArgsManager& args)

{

    return std::make_unique<wallet::WalletLoaderImpl>(chain, args);

}

} // namespace interfaces