text: // Copyright (c) 2011-2015 The Bitcoin Core developers
  // Copyright (c) 2015-2018 The Diskcoin developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "walletmodel.h"
  
  #include "addresstablemodel.h"
  #include "guiconstants.h"
  #include "guiutil.h"
  #include "paymentserver.h"
  #include "recentrequeststablemodel.h"
  #include "transactiontablemodel.h"
  
  #include "dstencode.h"
  #include "keystore.h"
  #include "main.h"
  #include "sync.h"
  #include "ui_interface.h"
  #include "wallet/wallet.h"
  #include "wallet/walletdb.h" // for BackupWallet
  #include "wallet/rpcwallet.h"
  
  #include <stdint.h>
  
  #include <QDebug>
  #include <QSet>
  #include <QTimer>
  
  WalletModel::WalletModel(const PlatformStyle *platformStyle,
      CWallet *_wallet,
      OptionsModel *_optionsModel,
      QObject *parent)
      : QObject(parent), wallet(_wallet), optionsModel(_optionsModel), addressTableModel(0), transactionTableModel(0),
        recentRequestsTableModel(0), cachedBalance(0), cachedUnconfirmedBalance(0), cachedImmatureBalance(0),
        cachedEncryptionStatus(Unencrypted), cachedNumBlocks(0)
  {
      fHaveWatchOnly = wallet->HaveWatchOnly() || getWatchBalance() > 0;
      fForceCheckBalanceChanged = false;
  
      addressTableModel = new AddressTableModel(wallet, this);
      transactionTableModel = new TransactionTableModel(platformStyle, wallet, this);
      recentRequestsTableModel = new RecentRequestsTableModel(wallet, this);
  
      // This timer will be fired repeatedly to update the balance
      pollTimer = new QTimer(this);
      connect(pollTimer, SIGNAL(timeout()), this, SLOT(pollBalanceChanged()));
      pollTimer->start(MODEL_UPDATE_DELAY1);
  
      subscribeToCoreSignals();
  }
  
  WalletModel::~WalletModel() { unsubscribeFromCoreSignals(); }
  CAmount WalletModel::getBalance(const CCoinControl *coinControl) const
  {
      if (coinControl)
      {
          CAmount nBalance = 0;
          std::vector<COutput> vCoins;
          wallet->AvailableCoins(vCoins, true, coinControl);
          //modify for diskcoin -->
          for (const COutput &out : vCoins) {
              if (out.fSpendable) {
                  if (!check_utxo_can_spent(*out.tx, out.i, out.nDepth)) { //has detect spendable
                      LOGA("%s Skip idx: %d[%llu]", __func__, out.i, out.tx->vout[out.i].nValue);
                      continue;
                  }
                  nBalance += out.tx->vout[out.i].nValue;
              }
          }
          //<--
          LOGA("%s:%d, %llu", __func__, __LINE__, nBalance);
          return nBalance;
      }
  
      CAmount balance = wallet->GetBalance();
          LOGA("%s:%d, %llu", __func__, __LINE__, balance);
      return balance;
  }
  
  CAmount WalletModel::getStakeinBalance() const
  {
      CAmount amount = 0;
      UniValue objRequest(UniValue::VARR);
      UniValue objResponse(UniValue::VOBJ);
  
      bool bRet = true;
      try {
          objResponse = liststakein(objRequest, false);
          UniValue arrRow = objResponse.get_array();
          for (unsigned i=0; i<arrRow.size(); i++) {
              const UniValue &row = arrRow[i].get_obj();
              amount += row["satoshi"].get_uint64();
              LOGA("%s:%d utxo %s : %d, satoshi: %llu", __func__, __LINE__, row["txid"].get_str(), row["vout"].get_int(), row["satoshi"].get_uint64());
          }
          LOGA("%s:%d, total amount = %llu", __func__, __LINE__, amount);
      } catch(const UniValue &objError) {
          LOGA("Failed to %s:%d. err: %s", __func__, __LINE__, objError.write());
      }
      return amount;
  }
  
  CAmount WalletModel::getStaketoBalance() const
  {
      CAmount amount = 0;
      UniValue objRequest(UniValue::VARR);
      UniValue objResponse(UniValue::VOBJ);
  
      bool bRet = true;
      try {
          objResponse = liststakeout(objRequest, false);
          UniValue arrRow = objResponse.get_array();
          for (unsigned i=0; i<arrRow.size(); i++) {
              const UniValue &row = arrRow[i].get_obj();
              amount += row["satoshi"].get_uint64();
              LOGA("%s:%d utxo %s : %d, satoshi: %llu", __func__, __LINE__, row["txid"].get_str(), row["vout"].get_int(), row["satoshi"].get_uint64());
          }
          LOGA("%s:%d, total amount = %llu", __func__, __LINE__, amount);
      } catch(const UniValue &objError) {
          LOGA("Failed to %s:%d. err: %s", __func__, __LINE__, objError.write());
      }
      return amount;
  }
  
  CAmount WalletModel::getUnstakingBalance() const
  {
      CAmount amount = 0;
      UniValue objRequest(UniValue::VARR);
      UniValue objResponse(UniValue::VOBJ);
  
      bool bRet = true;
      try {
          objRequest.push_back(0); //for mempool
          
          objResponse = listunstake(objRequest, false);
          UniValue arrRow = objResponse.get_array();
          for (unsigned i=0; i<arrRow.size(); i++) {
              const UniValue &row = arrRow[i].get_obj();
              amount += row["satoshi"].get_uint64();
              LOGA("%s:%d utxo %s : %d, satoshi: %llu", __func__, __LINE__, row["txid"].get_str(), row["vout"].get_int(), row["satoshi"].get_uint64());
          }
          LOGA("%s:%d, total amount = %llu", __func__, __LINE__, amount);
      } catch(const UniValue &objError) {
          LOGA("Failed to %s:%d. err: %s", __func__, __LINE__, objError.write());
      }
      return amount;
  }
  
  CAmount WalletModel::getWatchStakeBalance() const
  {
      return 0;
  }
  
  CAmount WalletModel::getWatchStaketoBalance() const
  {
      return 0;
  }
  
  CAmount WalletModel::getWatchUnstakingBalance() const
  {
      return 0;
  }
  
  CAmount WalletModel::getUnconfirmedBalance() const { return wallet->GetUnconfirmedBalance(); }
  CAmount WalletModel::getImmatureBalance() const { return wallet->GetImmatureBalance(); }
  bool WalletModel::haveWatchOnly() const { return fHaveWatchOnly; }
  CAmount WalletModel::getWatchBalance() const { return wallet->GetWatchOnlyBalance(); }
  CAmount WalletModel::getWatchUnconfirmedBalance() const { return wallet->GetUnconfirmedWatchOnlyBalance(); }
  CAmount WalletModel::getWatchImmatureBalance() const { return wallet->GetImmatureWatchOnlyBalance(); }
  void WalletModel::updateStatus()
  {
      EncryptionStatus newEncryptionStatus = getEncryptionStatus();
  
      if (cachedEncryptionStatus != newEncryptionStatus)
          Q_EMIT encryptionStatusChanged(newEncryptionStatus);
  }
  
  void WalletModel::pollBalanceChanged()
  {
      // Get required locks upfront. This avoids the GUI from getting stuck on
      // periodical polls if the core is holding the locks for a longer time -
      // for example, during a wallet rescan.
      TRY_LOCK(cs_main, lockMain);
      if (!lockMain)
          return;
      TRY_LOCK(wallet->cs_wallet, lockWallet);
      if (!lockWallet)
          return;
  
      if (fForceCheckBalanceChanged || chainActive.Height() != cachedNumBlocks)
      {
          fForceCheckBalanceChanged = false;
  
          // Balance and number of transactions might have changed
          cachedNumBlocks = chainActive.Height();
  
          checkBalanceChanged();
          if (transactionTableModel)
              transactionTableModel->updateConfirmations();
      }
  }
  
  void WalletModel::checkBalanceChanged()
  {
      CAmount newBalance = getBalance();
      CAmount newUnconfirmedBalance = getUnconfirmedBalance();
      CAmount newStakeBalance = getStakeinBalance();
      CAmount newstaketoBalance  = getStaketoBalance();
      CAmount newunstakingBalance = getUnstakingBalance();
      CAmount newImmatureBalance = getImmatureBalance();
      CAmount newWatchOnlyBalance = 0;
      CAmount newWatchUnconfBalance = 0;
      CAmount newWatchStakeBalance = 0;
      CAmount newwatchStaketoBalance = 0;
      CAmount newwatchUnstakingBalance = 0;
      CAmount newWatchImmatureBalance = 0;
      if (haveWatchOnly())
      {
          newWatchOnlyBalance = getWatchBalance();
          newWatchUnconfBalance = getWatchUnconfirmedBalance();
          newWatchStakeBalance = getWatchStakeBalance();
          newwatchStaketoBalance = getWatchStaketoBalance();
          newwatchUnstakingBalance = getWatchUnstakingBalance();
          newWatchImmatureBalance = getWatchImmatureBalance();
      }
  
      if (cachedBalance != newBalance || cachedUnconfirmedBalance != newUnconfirmedBalance ||
          cachedStakeBalance != newStakeBalance || cachedUnstakingBalance != newunstakingBalance ||
          cachedStaketoBalance != newstaketoBalance || cachedStaketoBalance != newwatchStaketoBalance ||
          cachedImmatureBalance != newImmatureBalance || cachedWatchOnlyBalance != newWatchOnlyBalance ||
          cachedWatchStakeBalance != newWatchStakeBalance || cachedwatchUnstakingBalance != newwatchUnstakingBalance ||
          cachedWatchUnconfBalance != newWatchUnconfBalance || cachedWatchImmatureBalance != newWatchImmatureBalance)
      {
          cachedBalance = newBalance;
          cachedUnconfirmedBalance = newUnconfirmedBalance;
          cachedStakeBalance = newStakeBalance;
          cachedStaketoBalance = newstaketoBalance;
          cachedUnstakingBalance = newunstakingBalance;
          cachedImmatureBalance = newImmatureBalance;
          cachedWatchOnlyBalance = newWatchOnlyBalance;
          cachedWatchUnconfBalance = newWatchUnconfBalance;
          cachedWatchStakeBalance = newWatchStakeBalance;
          cachedwatchStaketoBalance = newwatchStaketoBalance;
          cachedwatchUnstakingBalance = newwatchUnstakingBalance;
          cachedWatchImmatureBalance = newWatchImmatureBalance;
  
          Q_EMIT balanceChanged(newBalance, newUnconfirmedBalance, newStakeBalance, newstaketoBalance, newunstakingBalance, newImmatureBalance, newWatchOnlyBalance,
              newWatchUnconfBalance, newWatchStakeBalance, newwatchStaketoBalance, newwatchUnstakingBalance, newWatchImmatureBalance);
      }
  }
  
  void WalletModel::updateTransaction()
  {
      LOGA("%s:%d update trans.", __func__, __LINE__);
      // Balance and number of transactions might have changed
      fForceCheckBalanceChanged = true;
  }
  
  void WalletModel::updateAddressBook(const QString &address,
      const QString &label,
      bool isMine,
      const QString &purpose,
      int status)
  {
      if (addressTableModel)
          addressTableModel->updateEntry(address, label, isMine, purpose, status);
  }
  
  void WalletModel::updateWatchOnlyFlag(bool fHaveWatchonly)
  {
      fHaveWatchOnly = fHaveWatchonly;
      Q_EMIT notifyWatchonlyChanged(fHaveWatchonly);
  }
  
  bool WalletModel::validateAddress(const QString &address) { return IsValidDestinationString(address.toStdString()); }
  WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransaction &transaction,
      const CCoinControl *coinControl)
  {
      CAmount total = 0;
      bool fSubtractFeeFromAmount = false;
      QList<SendCoinsRecipient> recipients = transaction.getRecipients();
      std::vector<CRecipient> vecSend;
  
      if (recipients.empty())
      {
          return OK;
      }
  
      QSet<QString> setAddress; // Used to detect duplicates
      int nAddresses = 0;
  
      // Pre-check input data for validity
      Q_FOREACH (const SendCoinsRecipient &rcp, recipients)
      {
          if (rcp.fSubtractFeeFromAmount)
              fSubtractFeeFromAmount = true;
  
          if (rcp.paymentRequest.IsInitialized())
          { // PaymentRequest...
              CAmount subtotal = 0;
              const payments::PaymentDetails &details = rcp.paymentRequest.getDetails();
              for (int i = 0; i < details.outputs_size(); i++)
              {
                  const payments::Output &out = details.outputs(i);
                  if (out.amount() <= 0)
                      continue;
                  subtotal += out.amount();
                  const unsigned char *scriptStr = (const unsigned char *)out.script().data();
                  CScript scriptPubKey(scriptStr, scriptStr + out.script().size());
                  CAmount nAmount = out.amount();
                  CRecipient recipient = {scriptPubKey, nAmount, rcp.fSubtractFeeFromAmount};
                  vecSend.push_back(recipient);
              }
              if (subtotal <= 0)
              {
                  return InvalidAmount;
              }
              total += subtotal;
          }
          else
          { // User-entered diskcoin address / amount:
              if (!validateAddress(rcp.address))
              {
                  return InvalidAddress;
              }
              if (rcp.amount <= 0 && rcp.labelPublic == "")
              {
                  return InvalidAmount;
              }
              setAddress.insert(rcp.address);
              ++nAddresses;
  
              CScript scriptPubKey;
              if (rcp.labelPublic == "")
                  scriptPubKey = GetScriptForDestination(DecodeDestination(rcp.address.toStdString()));
              else
              {
                  scriptPubKey = GetScriptLabelPublic(rcp.labelPublic.toStdString());
                  // remove duplicate address as rcp.adddress was copied in SendCoinsDialog::on_sendButton_clicked()
                  --nAddresses;
  
                  // Make sure scriptPubKey is within size constraints and that we are configured
                  // to foward OP_RETURN transactions.
                  if (!fAcceptDatacarrier || scriptPubKey.size() > nMaxDatacarrierBytes)
                      return LabelPublicExceedsLimits;
              }
  
              CRecipient recipient = {scriptPubKey, rcp.amount, rcp.fSubtractFeeFromAmount};
              vecSend.push_back(recipient);
  
              total += rcp.amount;
          }
      }
      if (setAddress.size() != nAddresses)
      {
          return DuplicateAddress;
      }
  
      CAmount nBalance = getBalance(coinControl);
  
      if (total > nBalance)
      {
          return AmountExceedsBalance;
      }
  
      {
          LOCK2(cs_main, wallet->cs_wallet);
  
          transaction.newPossibleKeyChange(wallet);
  
          CAmount nFeeRequired = 0;
          int nChangePosRet = -1;
          std::string strFailReason;
  
          CWalletTx *newTx = transaction.getTransaction();
          CReserveKey *keyChange = transaction.getPossibleKeyChange();
          bool fCreated = wallet->CreateTransaction(
              vecSend, *newTx, *keyChange, nFeeRequired, nChangePosRet, strFailReason, coinControl);
          transaction.setTransactionFee(nFeeRequired);
          if (fSubtractFeeFromAmount && fCreated)
              transaction.reassignAmounts(nChangePosRet);
  
          if (!fCreated)
          {
              if (!fSubtractFeeFromAmount && (total + nFeeRequired) > nBalance)
              {
                  return SendCoinsReturn(AmountWithFeeExceedsBalance);
              }
              Q_EMIT message(tr("Send Coins"), QString::fromStdString(strFailReason), CClientUIInterface::MSG_ERROR);
              return TransactionCreationFailed;
          }
  
          // reject absurdly high fee. (This can never happen because the
          // wallet caps the fee at maxTxFee. This merely serves as a
          // belt-and-suspenders check)
          if (nFeeRequired > maxTxFee.Value())
              return AbsurdFee;
      }
  
      return SendCoinsReturn(OK);
  }
  
  WalletModel::SendCoinsReturn WalletModel::sendCoins(WalletModelTransaction &transaction)
  {
      QByteArray transaction_array; /* store serialized transaction */
  
      {
          LOCK2(cs_main, wallet->cs_wallet);
          CWalletTx *newTx = transaction.getTransaction();
  
          Q_FOREACH (const SendCoinsRecipient &rcp, transaction.getRecipients())
          {
              if (rcp.paymentRequest.IsInitialized())
              {
                  // Make sure any payment requests involved are still valid.
                  if (PaymentServer::verifyExpired(rcp.paymentRequest.getDetails()))
                  {
                      return PaymentRequestExpired;
                  }
  
                  // Store PaymentRequests in wtx.vOrderForm in wallet.
                  std::string key("PaymentRequest");
                  std::string value;
                  rcp.paymentRequest.SerializeToString(&value);
                  newTx->vOrderForm.push_back(make_pair(key, value));
              }
              else if (!rcp.message.isEmpty())
              {
                  // Message from normal bitcoincash:URI
                  // (bitcoincash:123...?message=example)
                  newTx->vOrderForm.push_back(make_pair("Message", rcp.message.toStdString()));
              }
              else if (!rcp.message.isEmpty()) // Message from normal bitcoin:URI (bitcoin:123...?message=example)
                  newTx->vOrderForm.push_back(make_pair("Message", rcp.message.toStdString()));
          }
  
          CReserveKey *keyChange = transaction.getPossibleKeyChange();
          if (!wallet->CommitTransaction(*newTx, *keyChange))
              return TransactionCommitFailed;
  
          CTransaction *t = (CTransaction *)newTx;
          CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
          ssTx << *t;
          transaction_array.append(&(ssTx[0]), ssTx.size());
      }
  
      // Add addresses / update labels that we've sent to to the address book,
      // and emit coinsSent signal for each recipient
      Q_FOREACH (const SendCoinsRecipient &rcp, transaction.getRecipients())
      {
          // Set have watch only flag to true if sending to a coin freeze address
          if (!rcp.freezeLockTime.isEmpty())
              this->updateWatchOnlyFlag(true);
  
          // Don't touch the address book when we have a payment request
          if (!rcp.paymentRequest.IsInitialized())
          {
              std::string strAddress = rcp.address.toStdString();
              CTxDestination dest = DecodeDestination(strAddress);
              std::string strLabel = rcp.label.toStdString();
              {
                  LOCK(wallet->cs_wallet);
  
                  std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(dest);
  
                  // Check if we have a new address or an updated label
                  if (mi == wallet->mapAddressBook.end())
                  {
                      wallet->SetAddressBook(dest, strLabel, "send");
                  }
                  else if (mi->second.name != strLabel)
                  {
                      wallet->SetAddressBook(dest, strLabel, ""); // "" means don't change purpose
                  }
              }
          }
          Q_EMIT coinsSent(wallet, rcp, transaction_array);
      }
      // update balance immediately, otherwise there could be a short noticeable delay until pollBalanceChanged hits
      checkBalanceChanged();
  
      return SendCoinsReturn(OK);
  }
  
  WalletModel::SendCoinsReturn WalletModel::stakeCoins(WalletModelTransaction &transaction)
  {
      QByteArray transaction_array; /* store serialized transaction */
  
      {
          LOCK2(cs_main, wallet->cs_wallet);
          CWalletTx *newTx = transaction.getTransaction();
  
          Q_FOREACH (const SendCoinsRecipient &rcp, transaction.getRecipients())
          {
              if (rcp.paymentRequest.IsInitialized())
              {
                  // Make sure any payment requests involved are still valid.
                  if (PaymentServer::verifyExpired(rcp.paymentRequest.getDetails()))
                  {
                      return PaymentRequestExpired;
                  }
  
                  // Store PaymentRequests in wtx.vOrderForm in wallet.
                  std::string key("PaymentRequest");
                  std::string value;
                  rcp.paymentRequest.SerializeToString(&value);
                  newTx->vOrderForm.push_back(make_pair(key, value));
              }
              else if (!rcp.message.isEmpty())
              {
                  // Message from normal bitcoincash:URI
                  // (bitcoincash:123...?message=example)
                  newTx->vOrderForm.push_back(make_pair("Message", rcp.message.toStdString()));
              }
              else if (!rcp.message.isEmpty()) // Message from normal bitcoin:URI (bitcoin:123...?message=example)
                  newTx->vOrderForm.push_back(make_pair("Message", rcp.message.toStdString()));
  
              //start to pledge
              std::string strAddress = rcp.address.toStdString();
  
              UniValue arr(UniValue::VARR);
              arr.push_back(UniValue(strAddress));
              arr.push_back(ValueFromAmount(rcp.amount));
  
              LOGAF("staketo address:%s, acount:%lu", strAddress, rcp.amount);
              try {
                  staketo(arr, false);
  
              } catch (const UniValue& errVal) {
                  LOGAF("Failed to rpc. err=%s", errVal.write());
                  return InvalidAmount;
              }
          }
  
          //CReserveKey *keyChange = transaction.getPossibleKeyChange();
          //if (!wallet->CommitTransaction(*newTx, *keyChange))
          //    return TransactionCommitFailed;
  
          CTransaction *t = (CTransaction *)newTx;
          CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
          ssTx << *t;
          transaction_array.append(&(ssTx[0]), ssTx.size());
      }
  
      // Add addresses / update labels that we've sent to to the address book,
      // and emit coinsSent signal for each recipient
      Q_FOREACH (const SendCoinsRecipient &rcp, transaction.getRecipients())
      {
          // Set have watch only flag to true if sending to a coin freeze address
          if (!rcp.freezeLockTime.isEmpty())
              this->updateWatchOnlyFlag(true);
  
          // Don't touch the address book when we have a payment request
          if (!rcp.paymentRequest.IsInitialized())
          {
              std::string strAddress = rcp.address.toStdString();
              CTxDestination dest = DecodeDestination(strAddress);
              std::string strLabel = rcp.label.toStdString();
              {
                  LOCK(wallet->cs_wallet);
  
                  std::map<CTxDestination, CAddressBookData>::iterator mi = wallet->mapAddressBook.find(dest);
  
                  // Check if we have a new address or an updated label
                  if (mi == wallet->mapAddressBook.end())
                  {
                      wallet->SetAddressBook(dest, strLabel, "stake");
                  }
                  else if (mi->second.name != strLabel)
                  {
                      wallet->SetAddressBook(dest, strLabel, ""); // "" means don't change purpose
                  }
              }
          }
          Q_EMIT coinsSent(wallet, rcp, transaction_array);
      }
      // update balance immediately, otherwise there could be a short noticeable delay until pollBalanceChanged hits
      checkBalanceChanged();
  
      return SendCoinsReturn(OK);
  }
  
  void WalletModel::unstakeCoins(std::string txid)
  {
      UniValue arr(UniValue::VARR);
      arr.push_back(UniValue(txid));
  
      LOGAF("unstake txid:%s.", txid);
      try {
          unstake(arr, false);
      } catch (const UniValue& errVal) {
          LOGAF("Failed to unstake rpc. err=%s", errVal.write());
      }
  }
  
  OptionsModel *WalletModel::getOptionsModel() { return optionsModel; }
  AddressTableModel *WalletModel::getAddressTableModel() { return addressTableModel; }
  TransactionTableModel *WalletModel::getTransactionTableModel() { return transactionTableModel; }
  RecentRequestsTableModel *WalletModel::getRecentRequestsTableModel() { return recentRequestsTableModel; }
  WalletModel::EncryptionStatus WalletModel::getEncryptionStatus() const
  {
      if (!wallet->IsCrypted())
      {
          return Unencrypted;
      }
      else if (wallet->IsLocked())
      {
          return Locked;
      }
      else
      {
          return Unlocked;
      }
  }
  
  bool WalletModel::setWalletEncrypted(bool encrypted, const SecureString &passphrase)
  {
      if (encrypted)
      {
          // Encrypt
          return wallet->EncryptWallet(passphrase);
      }
      else
      {
          // Decrypt -- TODO; not supported yet
          return false;
      }
  }
  
  bool WalletModel::setWalletLocked(bool locked, const SecureString &passPhrase)
  {
      if (locked)
      {
          // Lock
          return wallet->Lock();
      }
      else
      {
          // Unlock
          return wallet->Unlock(passPhrase);
      }
  }
  
  bool WalletModel::changePassphrase(const SecureString &oldPass, const SecureString &newPass)
  {
      bool retval;
      {
          LOCK(wallet->cs_wallet);
          wallet->Lock(); // Make sure wallet is locked before attempting pass change
          retval = wallet->ChangeWalletPassphrase(oldPass, newPass);
      }
      return retval;
  }
  
  bool WalletModel::backupWallet(const QString &filename) { return BackupWallet(*wallet, filename.toLocal8Bit().data()); }
  // Handlers for core signals
  static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel, CCryptoKeyStore *wallet)
  {
      qDebug() << "NotifyKeyStoreStatusChanged";
      QMetaObject::invokeMethod(walletmodel, "updateStatus", Qt::QueuedConnection);
  }
  
  static void NotifyAddressBookChanged(WalletModel *walletmodel,
      CWallet *wallet,
      const CTxDestination &address,
      const std::string &label,
      bool isMine,
      const std::string &purpose,
      ChangeType status)
  {
      QString strAddress = QString::fromStdString(EncodeDestination(address));
      QString strLabel = QString::fromStdString(label);
      QString strPurpose = QString::fromStdString(purpose);
  
      qDebug() << "NotifyAddressBookChanged: " + strAddress + " " + strLabel + " isMine=" + QString::number(isMine) +
                      " purpose=" + strPurpose + " status=" + QString::number(status);
      QMetaObject::invokeMethod(walletmodel, "updateAddressBook", Qt::QueuedConnection, Q_ARG(QString, strAddress),
          Q_ARG(QString, strLabel), Q_ARG(bool, isMine), Q_ARG(QString, strPurpose), Q_ARG(int, status));
  }
  
  static void NotifyTransactionChanged(WalletModel *walletmodel, CWallet *wallet, const uint256 &hash, ChangeType status)
  {
      Q_UNUSED(wallet);
      Q_UNUSED(hash);
      Q_UNUSED(status);
      QMetaObject::invokeMethod(walletmodel, "updateTransaction", Qt::QueuedConnection);
  }
  
  static void ShowProgress(WalletModel *walletmodel, const std::string &title, int nProgress)
  {
      // emits signal "showProgress"
      QMetaObject::invokeMethod(walletmodel, "showProgress", Qt::QueuedConnection,
          Q_ARG(QString, QString::fromStdString(title)), Q_ARG(int, nProgress));
  }
  
  static void NotifyWatchonlyChanged(WalletModel *walletmodel, bool fHaveWatchonly)
  {
      QMetaObject::invokeMethod(walletmodel, "updateWatchOnlyFlag", Qt::QueuedConnection, Q_ARG(bool, fHaveWatchonly));
  }
  
  void WalletModel::subscribeToCoreSignals()
  {
      // Connect signals to wallet
      wallet->NotifyStatusChanged.connect(boost::bind(&NotifyKeyStoreStatusChanged, this, _1));
      wallet->NotifyAddressBookChanged.connect(boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5, _6));
      wallet->NotifyTransactionChanged.connect(boost::bind(NotifyTransactionChanged, this, _1, _2, _3));
      wallet->ShowProgress.connect(boost::bind(ShowProgress, this, _1, _2));
      wallet->NotifyWatchonlyChanged.connect(boost::bind(NotifyWatchonlyChanged, this, _1));
  }
  
  void WalletModel::unsubscribeFromCoreSignals()
  {
      // Disconnect signals from wallet
      wallet->NotifyStatusChanged.disconnect(boost::bind(&NotifyKeyStoreStatusChanged, this, _1));
      wallet->NotifyAddressBookChanged.disconnect(boost::bind(NotifyAddressBookChanged, this, _1, _2, _3, _4, _5, _6));
      wallet->NotifyTransactionChanged.disconnect(boost::bind(NotifyTransactionChanged, this, _1, _2, _3));
      wallet->ShowProgress.disconnect(boost::bind(ShowProgress, this, _1, _2));
      wallet->NotifyWatchonlyChanged.disconnect(boost::bind(NotifyWatchonlyChanged, this, _1));
  }
  
  // WalletModel::UnlockContext implementation
  WalletModel::UnlockContext WalletModel::requestUnlock()
  {
      bool was_locked = getEncryptionStatus() == Locked;
      if (was_locked)
      {
          // Request UI to unlock wallet
          Q_EMIT requireUnlock();
      }
      // If wallet is still locked, unlock was failed or cancelled, mark context as invalid
      bool valid = getEncryptionStatus() != Locked;
  
      return UnlockContext(this, valid, was_locked);
  }
  
  WalletModel::UnlockContext::UnlockContext(WalletModel *_wallet, bool _valid, bool _relock)
      : wallet(_wallet), valid(_valid), relock(_relock)
  {
  }
  
  WalletModel::UnlockContext::~UnlockContext()
  {
      if (valid && relock)
      {
          wallet->setWalletLocked(true);
      }
  }
  
  void WalletModel::UnlockContext::CopyFrom(const UnlockContext &rhs)
  {
      // Transfer context; old object no longer relocks wallet
      *this = rhs;
      rhs.relock = false;
  }
  
  bool WalletModel::getPubKey(const CKeyID &address, CPubKey &vchPubKeyOut) const
  {
      return wallet->GetPubKey(address, vchPubKeyOut);
  }
  
  bool WalletModel::IsSpendable(const CTxDestination &dest) const { return wallet->IsMine(dest) & ISMINE_SPENDABLE; }
  // returns a list of COutputs from COutPoints
  void WalletModel::getOutputs(const std::vector<COutPoint> &vOutpoints, std::vector<COutput> &vOutputs)
  {
      LOCK2(cs_main, wallet->cs_wallet);
      for (const COutPoint &outpoint : vOutpoints)
      {
          if (!wallet->mapWallet.count(outpoint.hash))
              continue;
          int nDepth = wallet->mapWallet[outpoint.hash].GetDepthInMainChain();
          if (nDepth < 0)
              continue;
          COutput out(&wallet->mapWallet[outpoint.hash], outpoint.n, nDepth, true);
          vOutputs.push_back(out);
      }
  }
  
  bool WalletModel::isSpent(const COutPoint &outpoint) const
  {
      LOCK2(cs_main, wallet->cs_wallet);
      return wallet->IsSpent(outpoint.hash, outpoint.n);
  }
  
  // AvailableCoins + LockedCoins grouped by wallet address (put change in one group with wallet address)
  void WalletModel::listCoins(std::map<QString, std::vector<COutput> > &mapCoins) const
  {
      std::vector<COutput> vCoins;
      wallet->AvailableCoins(vCoins);
  
      LOCK2(cs_main, wallet->cs_wallet); // ListLockedCoins, mapWallet
      std::vector<COutPoint> vLockedCoins;
      wallet->ListLockedCoins(vLockedCoins);
  
      // add locked coins
      for (const COutPoint &outpoint : vLockedCoins)
      {
          if (!wallet->mapWallet.count(outpoint.hash))
              continue;
          int nDepth = wallet->mapWallet[outpoint.hash].GetDepthInMainChain();
          if (nDepth < 0)
              continue;
          COutput out(&wallet->mapWallet[outpoint.hash], outpoint.n, nDepth, true);
          if (outpoint.n < out.tx->vout.size() && wallet->IsMine(out.tx->vout[outpoint.n]) == ISMINE_SPENDABLE)
              vCoins.push_back(out);
      }
  
      for (const COutput &out : vCoins)
      {
          COutput cout = out;
  
          while (wallet->IsChange(cout.tx->vout[cout.i]) && cout.tx->vin.size() > 0 && wallet->IsMine(cout.tx->vin[0]))
          {
              if (!wallet->mapWallet.count(cout.tx->vin[0].prevout.hash))
                  break;
              cout = COutput(&wallet->mapWallet[cout.tx->vin[0].prevout.hash], cout.tx->vin[0].prevout.n, 0, true);
          }
  
          CTxDestination address;
          if (!out.fSpendable || !ExtractDestination(cout.tx->vout[cout.i].scriptPubKey, address))
              continue;
          //add for diskcoin -->
          if (!check_utxo_can_spent (*out.tx, out.i, out.nDepth)) {
              LOGA("%s Skip idx: %d[%llu]", __func__, out.i, out.tx->vout[out.i].nValue);
              continue;
          }
          //<--
          mapCoins[QString::fromStdString(EncodeDestination(address))].push_back(out);
      }
  }
  
  bool WalletModel::isLockedCoin(uint256 hash, unsigned int n) const
  {
      LOCK2(cs_main, wallet->cs_wallet);
      return wallet->IsLockedCoin(hash, n);
  }
  
  void WalletModel::lockCoin(COutPoint &output)
  {
      LOCK2(cs_main, wallet->cs_wallet);
      wallet->LockCoin(output);
  }
  
  void WalletModel::unlockCoin(COutPoint &output)
  {
      LOCK2(cs_main, wallet->cs_wallet);
      wallet->UnlockCoin(output);
  }
  
  void WalletModel::listLockedCoins(std::vector<COutPoint> &vOutpts)
  {
      LOCK2(cs_main, wallet->cs_wallet);
      wallet->ListLockedCoins(vOutpts);
  }
  
  void WalletModel::loadReceiveRequests(std::vector<std::string> &vReceiveRequests)
  {
      LOCK(wallet->cs_wallet);
      for (const PAIRTYPE(CTxDestination, CAddressBookData) & item : wallet->mapAddressBook)
          for (const PAIRTYPE(std::string, std::string) & item2 : item.second.destdata)
              if (item2.first.size() > 2 && item2.first.substr(0, 2) == "rr") // receive request
                  vReceiveRequests.push_back(item2.second);
  }
  
  bool WalletModel::saveReceiveRequest(const std::string &sAddress, const int64_t nId, const std::string &sRequest)
  {
      CTxDestination dest = DecodeDestination(sAddress);
  
      std::stringstream ss;
      ss << nId;
      std::string key = "rr" + ss.str(); // "rr" prefix = "receive request" in destdata
  
      LOCK(wallet->cs_wallet);
      if (sRequest.empty())
          return wallet->EraseDestData(dest, key);
      else
          return wallet->AddDestData(dest, key, sRequest);
  }
  
  bool WalletModel::hdEnabled() const { return wallet->IsHDEnabled(); }
  