text: // Copyright (c) 2018 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 <amount.h>
  #include <chain.h>
  #include <consensus/validation.h>
  #include <init.h>
  #include <interfaces/chain.h>
  #include <interfaces/handler.h>
  #include <net.h>
  #include <policy/feerate.h>
  #include <policy/fees.h>
  #include <policy/policy.h>
  #include <primitives/transaction.h>
  #include <rpc/server.h>
  #include <scheduler.h>
  #include <script/ismine.h>
  #include <script/standard.h>
  #include <support/allocators/secure.h>
  #include <sync.h>
  #include <timedata.h>
  #include <ui_interface.h>
  #include <uint256.h>
  #include <util/system.h>
  #include <validation.h>
  #include <wallet/feebumper.h>
  #include <wallet/fees.h>
  #include <wallet/rpcwallet.h>
  #include <wallet/wallet.h>
  #include <wallet/walletutil.h>
  
  #include <memory>
  #include <string>
  #include <utility>
  #include <vector>
  
  namespace interfaces {
  namespace {
  
  class PendingWalletTxImpl : public PendingWalletTx
  {
  public:
      explicit PendingWalletTxImpl(CWallet& wallet) : m_wallet(wallet), m_key(&wallet) {}
  
      const CTransaction& get() override { return *m_tx; }
  
      int64_t getVirtualSize() override { return GetVirtualTransactionSize(*m_tx); }
  
      bool commit(WalletValueMap value_map,
          WalletOrderForm order_form,
          std::string& reject_reason) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          CValidationState state;
          if (!m_wallet.CommitTransaction(m_tx, std::move(value_map), std::move(order_form), m_key, g_connman.get(), state)) {
              reject_reason = state.GetRejectReason();
              return false;
          }
          return true;
      }
  
      CTransactionRef m_tx;
      CWallet& m_wallet;
      CReserveKey m_key;
  };
  
  //! Construct wallet tx struct.
  WalletTx MakeWalletTx(interfaces::Chain::Lock& locked_chain, CWallet& wallet, const CWalletTx& wtx)
  {
      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(wallet.IsMine(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_address.emplace_back();
          result.txout_address_is_mine.emplace_back(ExtractDestination(txout.scriptPubKey, result.txout_address.back()) ?
                                                        IsMine(wallet, result.txout_address.back()) :
                                                        ISMINE_NO);
      }
      result.credit = wtx.GetCredit(locked_chain, ISMINE_ALL);
      result.debit = wtx.GetDebit(ISMINE_ALL);
      result.change = wtx.GetChange();
      result.time = wtx.GetTxTime();
      result.value_map = wtx.mapValue;
      result.is_coinbase = wtx.IsCoinBase();
      return result;
  }
  
  //! Construct wallet tx status struct.
  WalletTxStatus MakeWalletTxStatus(interfaces::Chain::Lock& locked_chain, const CWalletTx& wtx)
  {
      LockAnnotation lock(::cs_main); // Temporary, for CheckFinalTx below. Removed in upcoming commit.
  
      WalletTxStatus result;
      auto mi = ::mapBlockIndex.find(wtx.hashBlock);
      CBlockIndex* block = mi != ::mapBlockIndex.end() ? mi->second : nullptr;
      result.block_height = (block ? block->nHeight : std::numeric_limits<int>::max());
      result.blocks_to_maturity = wtx.GetBlocksToMaturity(locked_chain);
      result.depth_in_main_chain = wtx.GetDepthInMainChain(locked_chain);
      result.time_received = wtx.nTimeReceived;
      result.lock_time = wtx.tx->nLockTime;
      result.is_final = CheckFinalTx(*wtx.tx);
      result.is_trusted = wtx.IsTrusted(locked_chain);
      result.is_abandoned = wtx.isAbandoned();
      result.is_coinbase = wtx.IsCoinBase();
      result.is_in_main_chain = wtx.IsInMainChain(locked_chain);
      return result;
  }
  
  //! Construct wallet TxOut struct.
  WalletTxOut MakeWalletTxOut(interfaces::Chain::Lock& locked_chain,
      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(locked_chain, wtx.GetHash(), n);
      return result;
  }
  
  class WalletImpl : public Wallet
  {
  public:
      explicit WalletImpl(const std::shared_ptr<CWallet>& wallet) : m_shared_wallet(wallet), m_wallet(*wallet.get()) {}
  
      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(); }
      bool getKeyFromPool(bool internal, CPubKey& pub_key) override
      {
          return m_wallet.GetKeyFromPool(pub_key, internal);
      }
      bool getPubKey(const CKeyID& address, CPubKey& pub_key) override { return m_wallet.GetPubKey(address, pub_key); }
      bool getPrivKey(const CKeyID& address, CKey& key) override { return m_wallet.GetKey(address, key); }
      bool isSpendable(const CTxDestination& dest) override { return IsMine(m_wallet, dest) & ISMINE_SPENDABLE; }
      bool haveWatchOnly() override { return m_wallet.HaveWatchOnly(); };
      bool setAddressBook(const CTxDestination& dest, const std::string& name, const std::string& 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,
          std::string* purpose) override
      {
          LOCK(m_wallet.cs_wallet);
          auto it = m_wallet.mapAddressBook.find(dest);
          if (it == m_wallet.mapAddressBook.end()) {
              return false;
          }
          if (name) {
              *name = it->second.name;
          }
          if (is_mine) {
              *is_mine = IsMine(m_wallet, dest);
          }
          if (purpose) {
              *purpose = it->second.purpose;
          }
          return true;
      }
      std::vector<WalletAddress> getAddresses() override
      {
          LOCK(m_wallet.cs_wallet);
          std::vector<WalletAddress> result;
          for (const auto& item : m_wallet.mapAddressBook) {
              result.emplace_back(item.first, IsMine(m_wallet, item.first), item.second.name, item.second.purpose);
          }
          return result;
      }
      void learnRelatedScripts(const CPubKey& key, OutputType type) override { m_wallet.LearnRelatedScripts(key, type); }
      bool addDestData(const CTxDestination& dest, const std::string& key, const std::string& value) override
      {
          LOCK(m_wallet.cs_wallet);
          return m_wallet.AddDestData(dest, key, value);
      }
      bool eraseDestData(const CTxDestination& dest, const std::string& key) override
      {
          LOCK(m_wallet.cs_wallet);
          return m_wallet.EraseDestData(dest, key);
      }
      std::vector<std::string> getDestValues(const std::string& prefix) override
      {
          LOCK(m_wallet.cs_wallet);
          return m_wallet.GetDestValues(prefix);
      }
      void lockCoin(const COutPoint& output) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.LockCoin(output);
      }
      void unlockCoin(const COutPoint& output) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.UnlockCoin(output);
      }
      bool isLockedCoin(const COutPoint& output) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.IsLockedCoin(output.hash, output.n);
      }
      void listLockedCoins(std::vector<COutPoint>& outputs) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.ListLockedCoins(outputs);
      }
      std::unique_ptr<PendingWalletTx> createTransaction(const std::vector<CRecipient>& recipients,
          const CCoinControl& coin_control,
          bool sign,
          int& change_pos,
          CAmount& fee,
          std::string& fail_reason) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          auto pending = MakeUnique<PendingWalletTxImpl>(m_wallet);
          if (!m_wallet.CreateTransaction(*locked_chain, recipients, pending->m_tx, pending->m_key, fee, change_pos,
                  fail_reason, coin_control, sign)) {
              return {};
          }
          return std::move(pending);
      }
      bool transactionCanBeAbandoned(const uint256& txid) override { return m_wallet.TransactionCanBeAbandoned(txid); }
      bool abandonTransaction(const uint256& txid) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.AbandonTransaction(*locked_chain, txid);
      }
      bool transactionCanBeBumped(const uint256& txid) override
      {
          return feebumper::TransactionCanBeBumped(&m_wallet, txid);
      }
      bool createBumpTransaction(const uint256& txid,
          const CCoinControl& coin_control,
          CAmount total_fee,
          std::vector<std::string>& errors,
          CAmount& old_fee,
          CAmount& new_fee,
          CMutableTransaction& mtx) override
      {
          return feebumper::CreateTransaction(&m_wallet, txid, coin_control, total_fee, errors, old_fee, new_fee, mtx) ==
                 feebumper::Result::OK;
      }
      bool signBumpTransaction(CMutableTransaction& mtx) override { return feebumper::SignTransaction(&m_wallet, mtx); }
      bool commitBumpTransaction(const uint256& txid,
          CMutableTransaction&& mtx,
          std::vector<std::string>& errors,
          uint256& bumped_txid) override
      {
          return feebumper::CommitTransaction(&m_wallet, txid, std::move(mtx), errors, bumped_txid) ==
                 feebumper::Result::OK;
      }
      CTransactionRef getTx(const uint256& txid) override
      {
          auto locked_chain = m_wallet.chain().lock();
          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
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          auto mi = m_wallet.mapWallet.find(txid);
          if (mi != m_wallet.mapWallet.end()) {
              return MakeWalletTx(*locked_chain, m_wallet, mi->second);
          }
          return {};
      }
      std::vector<WalletTx> getWalletTxs() override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          std::vector<WalletTx> result;
          result.reserve(m_wallet.mapWallet.size());
          for (const auto& entry : m_wallet.mapWallet) {
              result.emplace_back(MakeWalletTx(*locked_chain, m_wallet, entry.second));
          }
          return result;
      }
      bool tryGetTxStatus(const uint256& txid,
          interfaces::WalletTxStatus& tx_status,
          int& num_blocks,
          int64_t& block_time) override
      {
          auto locked_chain = m_wallet.chain().lock(true /* try_lock */);
          if (!locked_chain) {
              return false;
          }
          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;
          }
          if (Optional<int> height = locked_chain->getHeight()) {
              num_blocks = *height;
              block_time = locked_chain->getBlockTime(*height);
          } else {
              num_blocks = -1;
              block_time = -1;
          }
          tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
          return true;
      }
      WalletTx getWalletTxDetails(const uint256& txid,
          WalletTxStatus& tx_status,
          WalletOrderForm& order_form,
          bool& in_mempool,
          int& num_blocks) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          auto mi = m_wallet.mapWallet.find(txid);
          if (mi != m_wallet.mapWallet.end()) {
              num_blocks = locked_chain->getHeight().get_value_or(-1);
              in_mempool = mi->second.InMempool();
              order_form = mi->second.vOrderForm;
              tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
              return MakeWalletTx(*locked_chain, m_wallet, mi->second);
          }
          return {};
      }
      WalletBalances getBalances() override
      {
          WalletBalances result;
          result.balance = m_wallet.GetBalance();
          result.unconfirmed_balance = m_wallet.GetUnconfirmedBalance();
          result.immature_balance = m_wallet.GetImmatureBalance();
          result.have_watch_only = m_wallet.HaveWatchOnly();
          if (result.have_watch_only) {
              result.watch_only_balance = m_wallet.GetBalance(ISMINE_WATCH_ONLY);
              result.unconfirmed_watch_only_balance = m_wallet.GetUnconfirmedWatchOnlyBalance();
              result.immature_watch_only_balance = m_wallet.GetImmatureWatchOnlyBalance();
          }
          return result;
      }
      bool tryGetBalances(WalletBalances& balances, int& num_blocks) override
      {
          auto locked_chain = m_wallet.chain().lock(true /* try_lock */);
          if (!locked_chain) return false;
          TRY_LOCK(m_wallet.cs_wallet, locked_wallet);
          if (!locked_wallet) {
              return false;
          }
          balances = getBalances();
          num_blocks = locked_chain->getHeight().get_value_or(-1);
          return true;
      }
      CAmount getBalance() override { return m_wallet.GetBalance(); }
      CAmount getAvailableBalance(const CCoinControl& coin_control) override
      {
          return m_wallet.GetAvailableBalance(&coin_control);
      }
      isminetype txinIsMine(const CTxIn& txin) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.IsMine(txin);
      }
      isminetype txoutIsMine(const CTxOut& txout) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.IsMine(txout);
      }
      CAmount getDebit(const CTxIn& txin, isminefilter filter) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.GetDebit(txin, filter);
      }
      CAmount getCredit(const CTxOut& txout, isminefilter filter) override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          return m_wallet.GetCredit(txout, filter);
      }
      CoinsList listCoins() override
      {
          auto locked_chain = m_wallet.chain().lock();
          LOCK(m_wallet.cs_wallet);
          CoinsList result;
          for (const auto& entry : m_wallet.ListCoins(*locked_chain)) {
              auto& group = result[entry.first];
              for (const auto& coin : entry.second) {
                  group.emplace_back(COutPoint(coin.tx->GetHash(), coin.i),
                      MakeWalletTxOut(*locked_chain, m_wallet, *coin.tx, coin.i, coin.nDepth));
              }
          }
          return result;
      }
      std::vector<WalletTxOut> getCoins(const std::vector<COutPoint>& outputs) override
      {
          auto locked_chain = m_wallet.chain().lock();
          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 = it->second.GetDepthInMainChain(*locked_chain);
                  if (depth >= 0) {
                      result.back() = MakeWalletTxOut(*locked_chain, 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, ::mempool, ::feeEstimator, &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 IsWalletFlagSet(uint64_t flag) override { return m_wallet.IsWalletFlagSet(flag); }
      OutputType getDefaultAddressType() override { return m_wallet.m_default_address_type; }
      OutputType getDefaultChangeType() override { return m_wallet.m_default_change_type; }
      std::unique_ptr<Handler> handleUnload(UnloadFn fn) override
      {
          return MakeHandler(m_wallet.NotifyUnload.connect(fn));
      }
      std::unique_ptr<Handler> handleShowProgress(ShowProgressFn fn) override
      {
          return MakeHandler(m_wallet.ShowProgress.connect(fn));
      }
      std::unique_ptr<Handler> handleStatusChanged(StatusChangedFn fn) override
      {
          return MakeHandler(m_wallet.NotifyStatusChanged.connect([fn](CCryptoKeyStore*) { fn(); }));
      }
      std::unique_ptr<Handler> handleAddressBookChanged(AddressBookChangedFn fn) override
      {
          return MakeHandler(m_wallet.NotifyAddressBookChanged.connect(
              [fn](CWallet*, const CTxDestination& address, const std::string& label, bool is_mine,
                  const std::string& purpose, ChangeType status) { fn(address, label, is_mine, purpose, status); }));
      }
      std::unique_ptr<Handler> handleTransactionChanged(TransactionChangedFn fn) override
      {
          return MakeHandler(m_wallet.NotifyTransactionChanged.connect(
              [fn](CWallet*, const uint256& txid, ChangeType status) { fn(txid, status); }));
      }
      std::unique_ptr<Handler> handleWatchOnlyChanged(WatchOnlyChangedFn fn) override
      {
          return MakeHandler(m_wallet.NotifyWatchonlyChanged.connect(fn));
      }
      std::unique_ptr<Handler> handleCanGetAddressesChanged(CanGetAddressesChangedFn fn) override
      {
          return MakeHandler(m_wallet.NotifyCanGetAddressesChanged.connect(fn));
      }
  
      std::shared_ptr<CWallet> m_shared_wallet;
      CWallet& m_wallet;
  };
  
  class WalletClientImpl : public ChainClient
  {
  public:
      WalletClientImpl(Chain& chain, std::vector<std::string> wallet_filenames)
          : m_chain(chain), m_wallet_filenames(std::move(wallet_filenames))
      {
      }
      void registerRpcs() override { return RegisterWalletRPCCommands(::tableRPC); }
      bool verify() override { return VerifyWallets(m_chain, m_wallet_filenames); }
      bool load() override { return LoadWallets(m_chain, m_wallet_filenames); }
      void start(CScheduler& scheduler) override { return StartWallets(scheduler); }
      void flush() override { return FlushWallets(); }
      void stop() override { return StopWallets(); }
      ~WalletClientImpl() override { UnloadWallets(); }
  
      Chain& m_chain;
      std::vector<std::string> m_wallet_filenames;
  };
  
  } // namespace
  
  std::unique_ptr<Wallet> MakeWallet(const std::shared_ptr<CWallet>& wallet) { return MakeUnique<WalletImpl>(wallet); }
  
  std::unique_ptr<ChainClient> MakeWalletClient(Chain& chain, std::vector<std::string> wallet_filenames)
  {
      return MakeUnique<WalletClientImpl>(chain, std::move(wallet_filenames));
  }
  
  } // namespace interfaces
  