text: // Copyright (c) 2011-2015 The Gtacoin Core 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 "base58.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 <stdint.h>
  
  #include <QDebug>
  #include <QSet>
  #include <QTimer>
  
  #include <boost/foreach.hpp>
  // GTACOIN
  #include "guiutil.h"
  #include "aliastablemodel.h"
  #include "messagetablemodel.h"
  #include "escrowtablemodel.h"
  #include "certtablemodel.h"
  #include "offertablemodel.h"
  #include "offeraccepttablemodel.h"
  #include <QSettings>
  using namespace std;
  extern bool DecodeAndParseAliasTx(const CTransaction& tx, int& op, int& nOut, vector<vector<unsigned char> >& vvch);
  extern bool DecodeAndParseOfferTx(const CTransaction& tx, int& op, int& nOut, vector<vector<unsigned char> >& vvch);
  extern bool DecodeAndParseCertTx(const CTransaction& tx, int& op, int& nOut, vector<vector<unsigned char> >& vvch);
  extern bool DecodeAndParseMessageTx(const CTransaction& tx, int& op, int& nOut, vector<vector<unsigned char> >& vvch);
  extern bool DecodeAndParseEscrowTx(const CTransaction& tx, int& op, int& nOut, vector<vector<unsigned char> >& vvch);
  extern std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags = 0);
  extern bool DecodeHexTx(CTransaction& tx, const std::string& strHexTx, bool fTryNoWitness = false);
  WalletModel::WalletModel(const PlatformStyle *platformStyle, CWallet *_wallet, OptionsModel *_optionsModel, QObject *parent) :
      QObject(parent), wallet(_wallet), optionsModel(_optionsModel), addressTableModel(0),
  	// GTACOIN
  	aliasTableModelMine(0), aliasTableModelAll(0), certTableModelMine(0), certTableModelAll(0), offerTableModelMine(0), offerTableModelAll(0), offerTableModelAccept(0), offerTableModelMyAccept(0),
      transactionTableModel(0),
      recentRequestsTableModel(0),
      cachedBalance(0), cachedUnconfirmedBalance(0), cachedImmatureBalance(0),
      cachedEncryptionStatus(Unencrypted),
      cachedNumBlocks(0)
  {
      fHaveWatchOnly = wallet->HaveWatchOnly();
      fForceCheckBalanceChanged = false;
  
      addressTableModel = new AddressTableModel(wallet, this);
      transactionTableModel = new TransactionTableModel(platformStyle, wallet, this);
      recentRequestsTableModel = new RecentRequestsTableModel(wallet, this);
  	// GTACOIN
  	aliasTableModelMine = new AliasTableModel(wallet, this, MyAlias);
  	aliasTableModelAll = new AliasTableModel(wallet, this, AllAlias);
  	escrowTableModelMine = new EscrowTableModel(wallet, this, MyEscrow);
  	escrowTableModelAll = new EscrowTableModel(wallet, this, AllEscrow);
  	inMessageTableModel = new MessageTableModel(wallet, this, InMessage);
  	outMessageTableModel = new MessageTableModel(wallet, this, OutMessage);
  	certTableModelMine = new CertTableModel(wallet, this, MyCert);
  	certTableModelAll = new CertTableModel(wallet, this, AllCert);
  	offerTableModelMine = new OfferTableModel(wallet, this, MyOffer);
  	offerTableModelAll = new OfferTableModel(wallet, this, AllOffer);
  	offerTableModelAccept = new OfferAcceptTableModel(wallet, this, Accept);
  	offerTableModelMyAccept = new OfferAcceptTableModel(wallet, this, MyAccept);
      // 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_DELAY);
  
      subscribeToCoreSignals();
  }
  
  WalletModel::~WalletModel()
  {
      unsubscribeFromCoreSignals();
  }
  // GTACOIN
  void appendListAliases(UniValue& defaultAliasArray, bool allAliases)
  {
  	QSettings settings;
  	QString defaultListAlias = settings.value("defaultListAlias", "").toString();
  	if(allAliases || defaultListAlias == QObject::tr("All"))
  	{
  		string strMethod = string("aliaslist");
  		UniValue params(UniValue::VARR); 
  		UniValue result ;
  		string name_str;
  		
  		try {
  
  			result = tableRPC.execute(strMethod, params);
  
  			if (result.type() == UniValue::VARR)
  			{
  				name_str = "";
  				const UniValue &arr = result.get_array();
  				for (unsigned int idx = 0; idx < arr.size(); idx++) {
  					const UniValue& input = arr[idx];
  					if (input.type() != UniValue::VOBJ)
  						continue;
  					const UniValue& o = input.get_obj();
  					name_str = "";
  					const UniValue& name_value = find_value(o, "name");
  					if (name_value.type() == UniValue::VSTR)
  					{
  						name_str = name_value.get_str();
  						defaultAliasArray.push_back(name_str);
  					}
  				}
  			}
  		}
  		catch (UniValue& objError)
  		{
  		}
  		catch(std::exception& e)
  		{
  		}
  	}
  	else
  	{
  		defaultAliasArray.push_back(defaultListAlias.toStdString());
  	}
  }
  CAmount WalletModel::getBalance(const CCoinControl *coinControl) const
  {
      if (coinControl)
      {
          CAmount nBalance = 0;
          std::vector<COutput> vCoins;
          wallet->AvailableCoins(vCoins, true, coinControl);
          BOOST_FOREACH(const COutput& out, vCoins)
  			if(out.fSpendable)
  				nBalance += out.tx->vout[out.i].nValue;
  
          return nBalance;
      }
      return wallet->GetBalance();
  }
  
  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 newImmatureBalance = getImmatureBalance();
      CAmount newWatchOnlyBalance = 0;
      CAmount newWatchUnconfBalance = 0;
      CAmount newWatchImmatureBalance = 0;
      if (haveWatchOnly())
      {
          newWatchOnlyBalance = getWatchBalance();
          newWatchUnconfBalance = getWatchUnconfirmedBalance();
          newWatchImmatureBalance = getWatchImmatureBalance();
      }
  
      if(cachedBalance != newBalance || cachedUnconfirmedBalance != newUnconfirmedBalance || cachedImmatureBalance != newImmatureBalance ||
          cachedWatchOnlyBalance != newWatchOnlyBalance || cachedWatchUnconfBalance != newWatchUnconfBalance || cachedWatchImmatureBalance != newWatchImmatureBalance)
      {
          cachedBalance = newBalance;
          cachedUnconfirmedBalance = newUnconfirmedBalance;
          cachedImmatureBalance = newImmatureBalance;
          cachedWatchOnlyBalance = newWatchOnlyBalance;
          cachedWatchUnconfBalance = newWatchUnconfBalance;
          cachedWatchImmatureBalance = newWatchImmatureBalance;
          Q_EMIT balanceChanged(newBalance, newUnconfirmedBalance, newImmatureBalance,
                              newWatchOnlyBalance, newWatchUnconfBalance, newWatchImmatureBalance);
      }
  }
  
  void WalletModel::updateTransaction()
  {
      // 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);
  }
  // GTACOIN
  void WalletModel::updateAlias() {
  	if (aliasTableModelMine)
  		aliasTableModelMine->refreshAliasTable();
  }
  
  void WalletModel::updateCert() {
  	if (certTableModelMine)
  		certTableModelMine->refreshCertTable();
  }
  void WalletModel::updateMessage() {
  	if (inMessageTableModel)
  		inMessageTableModel->refreshMessageTable();
  	if (outMessageTableModel)
  		outMessageTableModel->refreshMessageTable();
  }
  void WalletModel::updateEscrow() {
  	if (escrowTableModelMine)
  		escrowTableModelMine->refreshEscrowTable();
  }
  void WalletModel::updateOffer() {
  	if (offerTableModelMine)
  		offerTableModelMine->refreshOfferTable();
  	if (offerTableModelAccept)
  		offerTableModelAccept->refreshOfferTable();
  	if (offerTableModelMyAccept)
  		offerTableModelMyAccept->refreshOfferTable();
  }
  void WalletModel::updateWatchOnlyFlag(bool fHaveWatchonly)
  {
      fHaveWatchOnly = fHaveWatchonly;
      Q_EMIT notifyWatchonlyChanged(fHaveWatchonly);
  }
  
  bool WalletModel::validateAddress(const QString &address)
  {
      CGtacoinAddress addressParsed(address.toStdString());
      return addressParsed.IsValid();
  }
  
  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 gtacoin address / amount:
              if(!validateAddress(rcp.address))
              {
                  return InvalidAddress;
              }
              if(rcp.amount <= 0)
              {
                  return InvalidAmount;
              }
              setAddress.insert(rcp.address);
              ++nAddresses;
  
              CScript scriptPubKey = GetScriptForDestination(CGtacoinAddress(rcp.address.toStdString()).Get());
              CRecipient recipient = {scriptPubKey, rcp.amount, rcp.fSubtractFeeFromAmount};
              vecSend.push_back(recipient);
  
              total += rcp.amount;
          }
      }
      if(setAddress.size() != nAddresses)
      {
          return DuplicateAddress;
      }
  
      CAmount nBalance = getBalance(coinControl);
  
  	// GTACOIN
  	/*
      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();
  		// GTACOIN pass in false to not sign
          bool fCreated = wallet->CreateTransaction(vecSend, *newTx, *keyChange, nFeeRequired, nChangePosRet, strFailReason, coinControl, false);
          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)
              return AbsurdFee;
  
  		// GTACOIN
  		UniValue resSign;
  		UniValue signParams(UniValue::VARR);
  		signParams.push_back(EncodeHexTx(*newTx));
  		try
  		{
  			resSign = tableRPC.execute("signrawtransaction", signParams);
  		}
  		catch (UniValue& objError)
  		{
  			Q_EMIT message(tr("Send Coins"), QString("%1").arg(QString::fromStdString(find_value(objError, "message").get_str())),
  				CClientUIInterface::MSG_ERROR);
  			return InvalidMultisig;
  		}	
  		catch (const std::exception& e) {
  			Q_EMIT message(tr("Send Coins"), QString("%1").arg(QString::fromStdString(e.what())),
  				CClientUIInterface::MSG_ERROR);
  			return InvalidMultisig;
  		}
  		if (!resSign.isObject())
  		{
  			Q_EMIT message(tr("Send Coins"), tr("Could not sign multisig transaction: Invalid response from signrawtransaction"),
  				CClientUIInterface::MSG_ERROR);
  			return InvalidMultisig;
  		}
  
  		const UniValue& so = resSign.get_obj();
  		string hex_str = "";
  
  		const UniValue& hex_value = find_value(so, "hex");
  		if (hex_value.isStr())
  			hex_str = hex_value.get_str();
  		const UniValue& complete_value = find_value(so, "complete");
  		bool bComplete = false;
  		if (complete_value.isBool())
  			bComplete = complete_value.get_bool();
  		if(!bComplete)
  		{
  			GUIUtil::setClipboard(QString::fromStdString(hex_str));
  			Q_EMIT message(tr("Send Coins"), tr("This transaction requires more signatures. Transaction hex has been copied to your clipboard for your reference. Please provide it to a signee that hasn't yet signed."),
  						 CClientUIInterface::MSG_INFORMATION);
  			return InvalidMultisig;
  		}
  		if(!DecodeHexTx(*newTx,hex_str))
  		{
  			Q_EMIT message(tr("Send Coins"), tr("Could not decode signed transaction!"),
  				CClientUIInterface::MSG_ERROR);
  			return InvalidMultisig;	
  		}
      }
  
      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 gtacoin:URI (gtacoin: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())
      {
          // Don't touch the address book when we have a payment request
          if (!rcp.paymentRequest.IsInitialized())
          {
              std::string strAddress = rcp.address.toStdString();
              CTxDestination dest = CGtacoinAddress(strAddress).Get();
              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);
      }
      checkBalanceChanged(); // update balance immediately, otherwise there could be a short noticeable delay until pollBalanceChanged hits
  
      return SendCoinsReturn(OK);
  }
  
  OptionsModel *WalletModel::getOptionsModel()
  {
      return optionsModel;
  }
  
  AddressTableModel *WalletModel::getAddressTableModel()
  {
      return addressTableModel;
  }
  
  TransactionTableModel *WalletModel::getTransactionTableModel()
  {
      return transactionTableModel;
  }
  // GTACOIN
  AliasTableModel *WalletModel::getAliasTableModelMine() {
  	return aliasTableModelMine;
  }
  AliasTableModel *WalletModel::getAliasTableModelAll() {
  	return aliasTableModelAll;
  }
  EscrowTableModel *WalletModel::getEscrowTableModelMine() {
  	return escrowTableModelMine;
  }
  EscrowTableModel *WalletModel::getEscrowTableModelAll() {
  	return escrowTableModelAll;
  }
  MessageTableModel *WalletModel::getMessageTableModelIn() {
  	return inMessageTableModel;
  }
  MessageTableModel *WalletModel::getMessageTableModelOut() {
  	return outMessageTableModel;
  }
  CertTableModel *WalletModel::getCertTableModelMine() {
  	return certTableModelMine;
  }
  CertTableModel *WalletModel::getCertTableModelAll() {
  	return certTableModelAll;
  }
  OfferTableModel *WalletModel::getOfferTableModelMine() {
  	return offerTableModelMine;
  }
  OfferTableModel *WalletModel::getOfferTableModelAll() {
  	return offerTableModelAll;
  }
  OfferAcceptTableModel *WalletModel::getOfferTableModelAccept() {
  	return offerTableModelAccept;
  }
  OfferAcceptTableModel *WalletModel::getOfferTableModelMyAccept() {
  	return offerTableModelMyAccept;
  }
  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 wallet->BackupWallet(filename.toLocal8Bit().data());
  }
  
  // Handlers for core signals
  static void NotifyKeyStoreStatusChanged(WalletModel *walletmodel, CCryptoKeyStore *wallet)
  {
      qDebug() << "NotifyKeyStoreStatusChanged";
      QMetaObject::invokeMethod(walletmodel, "updateStatus", Qt::QueuedConnection);
  }
  // GTACOIN
  static void NotifyGtacoinTransactionChanged(WalletModel *walletmodel, const CTransaction &tx, ChangeType status)
  {
  	std::vector<std::vector<unsigned char> > vvchArgs;
  	int op, nOut;
  	// there should only be one service with data carrying output per tx, notify for that one
  	if (DecodeAndParseAliasTx(tx, op, nOut, vvchArgs))
  		QMetaObject::invokeMethod(walletmodel, "updateAlias", Qt::QueuedConnection);
  	else if (DecodeAndParseOfferTx(tx, op, nOut, vvchArgs))
  		QMetaObject::invokeMethod(walletmodel, "updateOffer", Qt::QueuedConnection);
  	else if (DecodeAndParseCertTx(tx, op, nOut, vvchArgs))
  		QMetaObject::invokeMethod(walletmodel, "updateCert", Qt::QueuedConnection);
  	else if (DecodeAndParseEscrowTx(tx, op, nOut, vvchArgs))
  		QMetaObject::invokeMethod(walletmodel, "updateEscrow", Qt::QueuedConnection);
  	else if (DecodeAndParseMessageTx(tx, op, nOut, vvchArgs))
  		QMetaObject::invokeMethod(walletmodel, "updateMessage", 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(CGtacoinAddress(address).ToString());
      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);
      // GTACOIN
      std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(hash);
      bool inWallet = mi != wallet->mapWallet.end();
  	if(inWallet)
  		NotifyGtacoinTransactionChanged(walletmodel, mi->second, status);
  }
  
  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;
  
  	// GTACOIN
      return UnlockContext(this, valid, false/*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::havePrivKey(const CKeyID &address) const
  {
      return wallet->HaveKey(address);
  }
  
  // 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);
      BOOST_FOREACH(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, 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
      BOOST_FOREACH(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, true);
          if (outpoint.n < out.tx->vout.size() && wallet->IsMine(out.tx->vout[outpoint.n]) == ISMINE_SPENDABLE)
              vCoins.push_back(out);
      }
  
      BOOST_FOREACH(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, true);
          }
  		// GTACOIN txs are unspendable unless input to another gtacoin tx (passed into createtransaction)
  		if(out.tx->nVersion == GetGtacoinTxVersion())
  		{
  			int op;
  			vector<vector<unsigned char> > vvchArgs;
  			// any gta tx thats not an alias payment shouldnt show up in listCoins (used by coin control)
  			if (out.tx->vout.size() >= out.i && IsGtacoinScript(out.tx->vout[out.i].scriptPubKey, op, vvchArgs) && op != OP_ALIAS_PAYMENT)
  				continue;
  		}
          CTxDestination address;
  		// GTACOIN
          if(/*!out.fSpendable || */!ExtractDestination(cout.tx->vout[cout.i].scriptPubKey, address))
              continue;
  		// GTACOIN
  		CGtacoinAddress gtacoinAddress = CGtacoinAddress(address);
  		gtacoinAddress = CGtacoinAddress(gtacoinAddress.ToString());
  		QString qStrAddress = QString::fromStdString(gtacoinAddress.ToString());
  		if(gtacoinAddress.isAlias)
  			qStrAddress = QString::fromStdString(gtacoinAddress.aliasName);
          mapCoins[qStrAddress].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);
      BOOST_FOREACH(const PAIRTYPE(CTxDestination, CAddressBookData)& item, wallet->mapAddressBook)
          BOOST_FOREACH(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 = CGtacoinAddress(sAddress).Get();
  
      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::transactionCanBeAbandoned(uint256 hash) const
  {
      LOCK2(cs_main, wallet->cs_wallet);
      const CWalletTx *wtx = wallet->GetWalletTx(hash);
      if (!wtx || wtx->isAbandoned() || wtx->GetDepthInMainChain() > 0 || wtx->InMempool())
          return false;
      return true;
  }
  
  bool WalletModel::abandonTransaction(uint256 hash) const
  {
      LOCK2(cs_main, wallet->cs_wallet);
      return wallet->AbandonTransaction(hash);
  }
  