dash/src/qt/overviewpage.cpp

// Copyright (c) 2011-2015 The Bitcoin Core developers
// Copyright (c) 2014-2016 The Dash Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "overviewpage.h"
#include "ui_overviewpage.h"

#include "bitcoinunits.h"
#include "clientmodel.h"
#include "darksend.h"
#include "darksendconfig.h"
#include "guiconstants.h"
#include "guiutil.h"
#include "optionsmodel.h"
#include "platformstyle.h"
#include "transactionfilterproxy.h"
#include "transactiontablemodel.h"
#include "walletmodel.h"
#include "init.h"
#include "masternode-sync.h"

#include <QAbstractItemDelegate>
#include <QPainter>
#include <QSettings>
#include <QTimer>

#define ICON_OFFSET 16
#define DECORATION_SIZE 54
#define NUM_ITEMS 5

class TxViewDelegate : public QAbstractItemDelegate
{
    Q_OBJECT
public:
    TxViewDelegate(const PlatformStyle *platformStyle):
        QAbstractItemDelegate(), unit(BitcoinUnits::DASH),
        platformStyle(platformStyle)
    {

    }

    inline void paint(QPainter *painter, const QStyleOptionViewItem &option,
                      const QModelIndex &index ) const
    {
        painter->save();

        QIcon icon = qvariant_cast<QIcon>(index.data(TransactionTableModel::RawDecorationRole));
        QRect mainRect = option.rect;
        mainRect.moveLeft(ICON_OFFSET);
        QRect decorationRect(mainRect.topLeft(), QSize(DECORATION_SIZE, DECORATION_SIZE));
        int xspace = DECORATION_SIZE + 8;
        int ypad = 6;
        int halfheight = (mainRect.height() - 2*ypad)/2;
        QRect amountRect(mainRect.left() + xspace, mainRect.top()+ypad, mainRect.width() - xspace - ICON_OFFSET, halfheight);
        QRect addressRect(mainRect.left() + xspace, mainRect.top()+ypad+halfheight, mainRect.width() - xspace, halfheight);
        icon = platformStyle->SingleColorIcon(icon);
        icon.paint(painter, decorationRect);

        QDateTime date = index.data(TransactionTableModel::DateRole).toDateTime();
        QString address = index.data(Qt::DisplayRole).toString();
        qint64 amount = index.data(TransactionTableModel::AmountRole).toLongLong();
        bool confirmed = index.data(TransactionTableModel::ConfirmedRole).toBool();
        QVariant value = index.data(Qt::ForegroundRole);
        QColor foreground = option.palette.color(QPalette::Text);
        if(value.canConvert<QBrush>())
        {
            QBrush brush = qvariant_cast<QBrush>(value);
            foreground = brush.color();
        }

        painter->setPen(foreground);
        QRect boundingRect;
        painter->drawText(addressRect, Qt::AlignLeft|Qt::AlignVCenter, address, &boundingRect);

        if (index.data(TransactionTableModel::WatchonlyRole).toBool())
        {
            QIcon iconWatchonly = qvariant_cast<QIcon>(index.data(TransactionTableModel::WatchonlyDecorationRole));
            QRect watchonlyRect(boundingRect.right() + 5, mainRect.top()+ypad+halfheight, 16, halfheight);
            iconWatchonly.paint(painter, watchonlyRect);
        }

        if(amount < 0)
        {
            foreground = COLOR_NEGATIVE;
        }
        else if(!confirmed)
        {
            foreground = COLOR_UNCONFIRMED;
        }
        else
        {
            foreground = option.palette.color(QPalette::Text);
        }
        painter->setPen(foreground);
        QString amountText = BitcoinUnits::floorWithUnit(unit, amount, true, BitcoinUnits::separatorAlways);
        if(!confirmed)
        {
            amountText = QString("[") + amountText + QString("]");
        }
        painter->drawText(amountRect, Qt::AlignRight|Qt::AlignVCenter, amountText);

        painter->setPen(option.palette.color(QPalette::Text));
        painter->drawText(amountRect, Qt::AlignLeft|Qt::AlignVCenter, GUIUtil::dateTimeStr(date));

        painter->restore();
    }

    inline QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
    {
        return QSize(DECORATION_SIZE, DECORATION_SIZE);
    }

    int unit;
    const PlatformStyle *platformStyle;

};
#include "overviewpage.moc"

OverviewPage::OverviewPage(const PlatformStyle *platformStyle, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::OverviewPage),
    clientModel(0),
    walletModel(0),
    currentBalance(-1),
    currentUnconfirmedBalance(-1),
    currentImmatureBalance(-1),
    currentWatchOnlyBalance(-1),
    currentWatchUnconfBalance(-1),
    currentWatchImmatureBalance(-1),
    txdelegate(new TxViewDelegate(platformStyle)),
    filter(0)
{
    ui->setupUi(this);
    QString theme = GUIUtil::getThemeName();

    // Recent transactions
    ui->listTransactions->setItemDelegate(txdelegate);
    ui->listTransactions->setIconSize(QSize(DECORATION_SIZE, DECORATION_SIZE));
    ui->listTransactions->setMinimumHeight(NUM_ITEMS * (DECORATION_SIZE + 2));
    ui->listTransactions->setAttribute(Qt::WA_MacShowFocusRect, false);

    connect(ui->listTransactions, SIGNAL(clicked(QModelIndex)), this, SLOT(handleTransactionClicked(QModelIndex)));

    // init "out of sync" warning labels
    ui->labelWalletStatus->setText("(" + tr("out of sync") + ")");
    ui->labelPrivateSendSyncStatus->setText("(" + tr("out of sync") + ")");
    ui->labelTransactionsStatus->setText("(" + tr("out of sync") + ")");

    if(fLiteMode){
        ui->framePrivateSend->setVisible(false);
    } else {
        updateAdvancedPSUI(false);
        if(fMasterNode){
            ui->togglePrivateSend->setText("(" + tr("Disabled") + ")");
            ui->privateSendAuto->setText("(" + tr("Disabled") + ")");
            ui->privateSendReset->setText("(" + tr("Disabled") + ")");
            ui->framePrivateSend->setEnabled(false);
        } else {
            if(!fEnablePrivateSend){
                ui->togglePrivateSend->setText(tr("Start Mixing"));
            } else {
                ui->togglePrivateSend->setText(tr("Stop Mixing"));
            }
            timer = new QTimer(this);
            connect(timer, SIGNAL(timeout()), this, SLOT(privateSendStatus()));
            timer->start(1000);
        }
    }

    // start with displaying the "out of sync" warnings
    showOutOfSyncWarning(true);
}

void OverviewPage::handleTransactionClicked(const QModelIndex &index)
{
    if(filter)
        Q_EMIT transactionClicked(filter->mapToSource(index));
}

OverviewPage::~OverviewPage()
{
    if(!fLiteMode && !fMasterNode) disconnect(timer, SIGNAL(timeout()), this, SLOT(privateSendStatus()));
    delete ui;
}

void OverviewPage::setBalance(const CAmount& balance, const CAmount& unconfirmedBalance, const CAmount& immatureBalance, const CAmount& anonymizedBalance, const CAmount& watchOnlyBalance, const CAmount& watchUnconfBalance, const CAmount& watchImmatureBalance)
{
    currentBalance = balance;
    currentUnconfirmedBalance = unconfirmedBalance;
    currentImmatureBalance = immatureBalance;
    currentAnonymizedBalance = anonymizedBalance;
    currentWatchOnlyBalance = watchOnlyBalance;
    currentWatchUnconfBalance = watchUnconfBalance;
    currentWatchImmatureBalance = watchImmatureBalance;
    ui->labelBalance->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, balance, false, BitcoinUnits::separatorAlways));
    ui->labelUnconfirmed->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, unconfirmedBalance, false, BitcoinUnits::separatorAlways));
    ui->labelImmature->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, immatureBalance, false, BitcoinUnits::separatorAlways));
    ui->labelAnonymized->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, anonymizedBalance, false, BitcoinUnits::separatorAlways));
    ui->labelTotal->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, balance + unconfirmedBalance + immatureBalance, false, BitcoinUnits::separatorAlways));
    ui->labelWatchAvailable->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, watchOnlyBalance, false, BitcoinUnits::separatorAlways));
    ui->labelWatchPending->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, watchUnconfBalance, false, BitcoinUnits::separatorAlways));
    ui->labelWatchImmature->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, watchImmatureBalance, false, BitcoinUnits::separatorAlways));
    ui->labelWatchTotal->setText(BitcoinUnits::floorHtmlWithUnit(nDisplayUnit, watchOnlyBalance + watchUnconfBalance + watchImmatureBalance, false, BitcoinUnits::separatorAlways));

    // only show immature (newly mined) balance if it's non-zero, so as not to complicate things
    // for the non-mining users
    bool showImmature = immatureBalance != 0;
    bool showWatchOnlyImmature = watchImmatureBalance != 0;

    // for symmetry reasons also show immature label when the watch-only one is shown
    ui->labelImmature->setVisible(showImmature || showWatchOnlyImmature);
    ui->labelImmatureText->setVisible(showImmature || showWatchOnlyImmature);
    ui->labelWatchImmature->setVisible(showWatchOnlyImmature); // show watch-only immature balance

    updatePrivateSendProgress();

    static int cachedTxLocks = 0;

    if(cachedTxLocks != nCompleteTXLocks){
        cachedTxLocks = nCompleteTXLocks;
        ui->listTransactions->update();
    }
}

// show/hide watch-only labels
void OverviewPage::updateWatchOnlyLabels(bool showWatchOnly)
{
    ui->labelSpendable->setVisible(showWatchOnly);      // show spendable label (only when watch-only is active)
    ui->labelWatchonly->setVisible(showWatchOnly);      // show watch-only label
    ui->lineWatchBalance->setVisible(showWatchOnly);    // show watch-only balance separator line
    ui->labelWatchAvailable->setVisible(showWatchOnly); // show watch-only available balance
    ui->labelWatchPending->setVisible(showWatchOnly);   // show watch-only pending balance
    ui->labelWatchTotal->setVisible(showWatchOnly);     // show watch-only total balance

    if (!showWatchOnly){
        ui->labelWatchImmature->hide();
    }
    else{
        ui->labelBalance->setIndent(20);
        ui->labelUnconfirmed->setIndent(20);
        ui->labelImmature->setIndent(20);
        ui->labelTotal->setIndent(20);
    }
}

void OverviewPage::setClientModel(ClientModel *model)
{
    this->clientModel = model;
    if(model)
    {
        // Show warning if this is a prerelease version
        connect(model, SIGNAL(alertsChanged(QString)), this, SLOT(updateAlerts(QString)));
        updateAlerts(model->getStatusBarWarnings());
    }
}

void OverviewPage::setWalletModel(WalletModel *model)
{
    this->walletModel = model;
    if(model && model->getOptionsModel())
    {
        // Set up transaction list
        filter = new TransactionFilterProxy();
        filter->setSourceModel(model->getTransactionTableModel());
        filter->setLimit(NUM_ITEMS);
        filter->setDynamicSortFilter(true);
        filter->setSortRole(Qt::EditRole);
        filter->setShowInactive(false);
        filter->sort(TransactionTableModel::Status, Qt::DescendingOrder);

        ui->listTransactions->setModel(filter);
        ui->listTransactions->setModelColumn(TransactionTableModel::ToAddress);

        // Keep up to date with wallet
        setBalance(model->getBalance(), model->getUnconfirmedBalance(), model->getImmatureBalance(), model->getAnonymizedBalance(),
                   model->getWatchBalance(), model->getWatchUnconfirmedBalance(), model->getWatchImmatureBalance());
        connect(model, SIGNAL(balanceChanged(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)), this, SLOT(setBalance(CAmount,CAmount,CAmount,CAmount,CAmount,CAmount,CAmount)));

        connect(model->getOptionsModel(), SIGNAL(displayUnitChanged(int)), this, SLOT(updateDisplayUnit()));
        connect(model->getOptionsModel(), SIGNAL(privateSendRoundsChanged()), this, SLOT(updatePrivateSendProgress()));
        connect(model->getOptionsModel(), SIGNAL(anonymizeDashAmountChanged()), this, SLOT(updatePrivateSendProgress()));
        connect(model->getOptionsModel(), SIGNAL(advancedPSUIChanged(bool)), this, SLOT(updateAdvancedPSUI(bool)));
        updateAdvancedPSUI(model->getOptionsModel()->getShowAdvancedPSUI());

        connect(ui->privateSendAuto, SIGNAL(clicked()), this, SLOT(privateSendAuto()));
        connect(ui->privateSendReset, SIGNAL(clicked()), this, SLOT(privateSendReset()));
        connect(ui->togglePrivateSend, SIGNAL(clicked()), this, SLOT(togglePrivateSend()));
        updateWatchOnlyLabels(model->haveWatchOnly());
        connect(model, SIGNAL(notifyWatchonlyChanged(bool)), this, SLOT(updateWatchOnlyLabels(bool)));
    }

    // update the display unit, to not use the default ("DASH")
    updateDisplayUnit();
}

void OverviewPage::updateDisplayUnit()
{
    if(walletModel && walletModel->getOptionsModel())
    {
        nDisplayUnit = walletModel->getOptionsModel()->getDisplayUnit();
        if(currentBalance != -1)
            setBalance(currentBalance, currentUnconfirmedBalance, currentImmatureBalance, currentAnonymizedBalance,
                       currentWatchOnlyBalance, currentWatchUnconfBalance, currentWatchImmatureBalance);

        // Update txdelegate->unit with the current unit
        txdelegate->unit = nDisplayUnit;

        ui->listTransactions->update();
    }
}

void OverviewPage::updateAlerts(const QString &warnings)
{
    this->ui->labelAlerts->setVisible(!warnings.isEmpty());
    this->ui->labelAlerts->setText(warnings);
}

void OverviewPage::showOutOfSyncWarning(bool fShow)
{
    ui->labelWalletStatus->setVisible(fShow);
    ui->labelPrivateSendSyncStatus->setVisible(fShow);
    ui->labelTransactionsStatus->setVisible(fShow);
}

void OverviewPage::updatePrivateSendProgress()
{
    if(!masternodeSync.IsBlockchainSynced() || ShutdownRequested()) return;

    if(!pwalletMain) return;

    QString strAmountAndRounds;
    QString strAnonymizeDashAmount = BitcoinUnits::formatHtmlWithUnit(nDisplayUnit, nAnonymizeDashAmount * COIN, false, BitcoinUnits::separatorAlways);

    if(currentBalance == 0)
    {
        ui->privateSendProgress->setValue(0);
        ui->privateSendProgress->setToolTip(tr("No inputs detected"));

        // when balance is zero just show info from settings
        strAnonymizeDashAmount = strAnonymizeDashAmount.remove(strAnonymizeDashAmount.indexOf("."), BitcoinUnits::decimals(nDisplayUnit) + 1);
        strAmountAndRounds = strAnonymizeDashAmount + " / " + tr("%n Rounds", "", nPrivateSendRounds);

        ui->labelAmountRounds->setToolTip(tr("No inputs detected"));
        ui->labelAmountRounds->setText(strAmountAndRounds);
        return;
    }

    CAmount nDenominatedConfirmedBalance;
    CAmount nDenominatedUnconfirmedBalance;
    CAmount nAnonymizableBalance;
    CAmount nNormalizedAnonymizedBalance;
    double nAverageAnonymizedRounds;

    {
        nDenominatedConfirmedBalance = pwalletMain->GetDenominatedBalance();
        nDenominatedUnconfirmedBalance = pwalletMain->GetDenominatedBalance(true);
        nAnonymizableBalance = pwalletMain->GetAnonymizableBalance();
        nNormalizedAnonymizedBalance = pwalletMain->GetNormalizedAnonymizedBalance();
        nAverageAnonymizedRounds = pwalletMain->GetAverageAnonymizedRounds();
    }

    CAmount nMaxToAnonymize = nAnonymizableBalance + currentAnonymizedBalance + nDenominatedUnconfirmedBalance;

    // If it's more than the anon threshold, limit to that.
    if(nMaxToAnonymize > nAnonymizeDashAmount*COIN) nMaxToAnonymize = nAnonymizeDashAmount*COIN;

    if(nMaxToAnonymize == 0) return;

    if(nMaxToAnonymize >= nAnonymizeDashAmount * COIN) {
        ui->labelAmountRounds->setToolTip(tr("Found enough compatible inputs to anonymize %1")
                                          .arg(strAnonymizeDashAmount));
        strAnonymizeDashAmount = strAnonymizeDashAmount.remove(strAnonymizeDashAmount.indexOf("."), BitcoinUnits::decimals(nDisplayUnit) + 1);
        strAmountAndRounds = strAnonymizeDashAmount + " / " + tr("%n Rounds", "", nPrivateSendRounds);
    } else {
        QString strMaxToAnonymize = BitcoinUnits::formatHtmlWithUnit(nDisplayUnit, nMaxToAnonymize, false, BitcoinUnits::separatorAlways);
        ui->labelAmountRounds->setToolTip(tr("Not enough compatible inputs to anonymize <span style='color:red;'>%1</span>,<br>"
                                             "will anonymize <span style='color:red;'>%2</span> instead")
                                          .arg(strAnonymizeDashAmount)
                                          .arg(strMaxToAnonymize));
        strMaxToAnonymize = strMaxToAnonymize.remove(strMaxToAnonymize.indexOf("."), BitcoinUnits::decimals(nDisplayUnit) + 1);
        strAmountAndRounds = "<span style='color:red;'>" +
                QString(BitcoinUnits::factor(nDisplayUnit) == 1 ? "" : "~") + strMaxToAnonymize +
                " / " + tr("%n Rounds", "", nPrivateSendRounds) + "</span>";
    }
    ui->labelAmountRounds->setText(strAmountAndRounds);

    // calculate parts of the progress, each of them shouldn't be higher than 1
    // progress of denominating
    float denomPart = 0;
    // mixing progress of denominated balance
    float anonNormPart = 0;
    // completeness of full amount anonimization
    float anonFullPart = 0;

    CAmount denominatedBalance = nDenominatedConfirmedBalance + nDenominatedUnconfirmedBalance;
    denomPart = (float)denominatedBalance / nMaxToAnonymize;
    denomPart = denomPart > 1 ? 1 : denomPart;
    denomPart *= 100;

    anonNormPart = (float)nNormalizedAnonymizedBalance / nMaxToAnonymize;
    anonNormPart = anonNormPart > 1 ? 1 : anonNormPart;
    anonNormPart *= 100;

    anonFullPart = (float)currentAnonymizedBalance / nMaxToAnonymize;
    anonFullPart = anonFullPart > 1 ? 1 : anonFullPart;
    anonFullPart *= 100;

    // apply some weights to them ...
    float denomWeight = 1;
    float anonNormWeight = nPrivateSendRounds;
    float anonFullWeight = 2;
    float fullWeight = denomWeight + anonNormWeight + anonFullWeight;
    // ... and calculate the whole progress
    float denomPartCalc = ceilf((denomPart * denomWeight / fullWeight) * 100) / 100;
    float anonNormPartCalc = ceilf((anonNormPart * anonNormWeight / fullWeight) * 100) / 100;
    float anonFullPartCalc = ceilf((anonFullPart * anonFullWeight / fullWeight) * 100) / 100;
    float progress = denomPartCalc + anonNormPartCalc + anonFullPartCalc;
    if(progress >= 100) progress = 100;

    ui->privateSendProgress->setValue(progress);

    QString strToolPip = ("<b>" + tr("Overall progress") + ": %1%</b><br/>" +
                          tr("Denominated") + ": %2%<br/>" +
                          tr("Mixed") + ": %3%<br/>" +
                          tr("Anonymized") + ": %4%<br/>" +
                          tr("Denominated inputs have %5 of %n rounds on average", "", nPrivateSendRounds))
            .arg(progress).arg(denomPart).arg(anonNormPart).arg(anonFullPart)
            .arg(nAverageAnonymizedRounds);
    ui->privateSendProgress->setToolTip(strToolPip);
}

void OverviewPage::updateAdvancedPSUI(bool fShowAdvancedPSUI) {
    ui->labelCompletitionText->setVisible(fShowAdvancedPSUI);
    ui->privateSendProgress->setVisible(fShowAdvancedPSUI);
    ui->labelSubmittedDenomText->setVisible(fShowAdvancedPSUI);
    ui->labelSubmittedDenom->setVisible(fShowAdvancedPSUI);
    ui->privateSendAuto->setVisible(fShowAdvancedPSUI);
    ui->privateSendReset->setVisible(fShowAdvancedPSUI);
    ui->labelPrivateSendLastMessage->setVisible(fShowAdvancedPSUI);
}

void OverviewPage::privateSendStatus()
{
    if(!masternodeSync.IsBlockchainSynced() || ShutdownRequested()) return;

    static int64_t nLastDSProgressBlockTime = 0;
    int nBestHeight = clientModel->getNumBlocks();

    // we we're processing more then 1 block per second, we'll just leave
    if(((nBestHeight - darkSendPool.cachedNumBlocks) / (GetTimeMillis() - nLastDSProgressBlockTime + 1) > 1)) return;
    nLastDSProgressBlockTime = GetTimeMillis();

    if(!fEnablePrivateSend) {
        if(nBestHeight != darkSendPool.cachedNumBlocks)
        {
            darkSendPool.cachedNumBlocks = nBestHeight;
            updatePrivateSendProgress();

            ui->labelPrivateSendEnabled->setText(tr("Disabled"));
            ui->labelPrivateSendLastMessage->setText("");
            ui->togglePrivateSend->setText(tr("Start Mixing"));
        }

        return;
    }

    // check darksend status and unlock if needed
    if(nBestHeight != darkSendPool.cachedNumBlocks)
    {
        // Balance and number of transactions might have changed
        darkSendPool.cachedNumBlocks = nBestHeight;
        updatePrivateSendProgress();

        ui->labelPrivateSendEnabled->setText(tr("Enabled"));
    }

    QString strStatus = QString(darkSendPool.GetStatus().c_str());

    QString s = tr("Last PrivateSend message:\n") + strStatus;

    if(s != ui->labelPrivateSendLastMessage->text())
        LogPrintf("Last PrivateSend message: %s\n", strStatus.toStdString());

    ui->labelPrivateSendLastMessage->setText(s);

    if(darkSendPool.sessionDenom == 0){
        ui->labelSubmittedDenom->setText(tr("N/A"));
    } else {
        std::string out;
        darkSendPool.GetDenominationsToString(darkSendPool.sessionDenom, out);
        QString s2(out.c_str());
        ui->labelSubmittedDenom->setText(s2);
    }

}

void OverviewPage::privateSendAuto(){
    darkSendPool.DoAutomaticDenominating();
}

void OverviewPage::privateSendReset(){
    darkSendPool.Reset();

    QMessageBox::warning(this, tr("PrivateSend"),
        tr("PrivateSend was successfully reset."),
        QMessageBox::Ok, QMessageBox::Ok);
}

void OverviewPage::togglePrivateSend(){
    QSettings settings;
    // Popup some information on first mixing
    QString hasMixed = settings.value("hasMixed").toString();
    if(hasMixed.isEmpty()){
        QMessageBox::information(this, tr("PrivateSend"),
                tr("If you don't want to see internal PrivateSend fees/transactions select \"Most Common\" as Type on the \"Transactions\" tab."),
                QMessageBox::Ok, QMessageBox::Ok);
        settings.setValue("hasMixed", "hasMixed");
    }
    if(!fEnablePrivateSend){
        int64_t balance = currentBalance;
        float minAmount = 1.49 * COIN;
        if(balance < minAmount){
            QString strMinAmount(BitcoinUnits::formatWithUnit(nDisplayUnit, minAmount));
            QMessageBox::warning(this, tr("PrivateSend"),
                tr("PrivateSend requires at least %1 to use.").arg(strMinAmount),
                QMessageBox::Ok, QMessageBox::Ok);
            return;
        }

        // if wallet is locked, ask for a passphrase
        if (walletModel->getEncryptionStatus() == WalletModel::Locked)
        {
            WalletModel::UnlockContext ctx(walletModel->requestUnlock(false));
            if(!ctx.isValid())
            {
                //unlock was cancelled
                darkSendPool.cachedNumBlocks = std::numeric_limits<int>::max();
                QMessageBox::warning(this, tr("PrivateSend"),
                    tr("Wallet is locked and user declined to unlock. Disabling PrivateSend."),
                    QMessageBox::Ok, QMessageBox::Ok);
                if (fDebug) LogPrintf("Wallet is locked and user declined to unlock. Disabling PrivateSend.\n");
                return;
            }
        }

    }

    fEnablePrivateSend = !fEnablePrivateSend;
    darkSendPool.cachedNumBlocks = std::numeric_limits<int>::max();

    if(!fEnablePrivateSend){
        ui->togglePrivateSend->setText(tr("Start Mixing"));
        darkSendPool.UnlockCoins();
    } else {
        ui->togglePrivateSend->setText(tr("Stop Mixing"));

        /* show darksend configuration if client has defaults set */

        if(nAnonymizeDashAmount == 0){
            DarksendConfig dlg(this);
            dlg.setModel(walletModel);
            dlg.exec();
        }

    }
}