SilentDragonLite/src/mainwindow.cpp

#include "mainwindow.h"
#include "addressbook.h"
#include "ui_mainwindow.h"
#include "ui_addressbook.h"
#include "ui_zboard.h"
#include "ui_privkey.h"
#include "ui_about.h"
#include "ui_settings.h"
#include "ui_turnstile.h"
#include "ui_turnstileprogress.h"
#include "rpc.h"
#include "balancestablemodel.h"
#include "settings.h"
#include "version.h"
#include "turnstile.h"
#include "senttxstore.h"
#include "connection.h"

using json = nlohmann::json;

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    logger = new Logger(this, QDir(QStandardPaths::writableLocation(QStandardPaths::AppDataLocation)).filePath("zec-qt-wallet.log"));

    // Status Bar
    setupStatusBar();
    
    // Settings editor 
    setupSettingsModal();

    // Set up exit action
    QObject::connect(ui->actionExit, &QAction::triggered, this, &MainWindow::close);

    // Set up donate action
    QObject::connect(ui->actionDonate, &QAction::triggered, this, &MainWindow::donate);

    // Set up check for updates action
    QObject::connect(ui->actionCheck_for_Updates, &QAction::triggered, [=] () {
        QDesktopServices::openUrl(QUrl("https://github.com/adityapk00/zec-qt-wallet/releases"));
    });

    // Import Private Key
    QObject::connect(ui->actionImport_Private_Key, &QAction::triggered, this, &MainWindow::importPrivKey);

    // Export All Private Keys
    QObject::connect(ui->actionExport_All_Private_Keys, &QAction::triggered, this, &MainWindow::exportAllKeys);

    // Backup wallet.dat
    QObject::connect(ui->actionBackup_wallet_dat, &QAction::triggered, this, &MainWindow::backupWalletDat);

    // z-Board.net
    QObject::connect(ui->actionz_board_net, &QAction::triggered, this, &MainWindow::postToZBoard);

    // Address Book
    QObject::connect(ui->action_Address_Book, &QAction::triggered, this, &MainWindow::addressBook);

    // Set up about action
    QObject::connect(ui->actionAbout, &QAction::triggered, [=] () {
        QDialog aboutDialog(this);
        Ui_about about;
        about.setupUi(&aboutDialog);
        Settings::saveRestore(&aboutDialog);

        QString version    = QString("Version ") % QString(APP_VERSION) % " (" % QString(__DATE__) % ")";
        about.versionLabel->setText(version);
        
        aboutDialog.exec();
    });

    // Initialize to the balances tab
    ui->tabWidget->setCurrentIndex(0);

    // The zcashd tab is hidden by default, and only later added in if the embedded zcashd is started
    zcashdtab = ui->tabWidget->widget(4);
    ui->tabWidget->removeTab(4);

    setupSendTab();
    setupTransactionsTab();
    setupRecieveTab();
    setupBalancesTab();
    setupTurnstileDialog();
    setupZcashdTab();

    rpc = new RPC(this);

    restoreSavedStates();
}
 

void MainWindow::restoreSavedStates() {
    QSettings s;
    restoreGeometry(s.value("geometry").toByteArray());

    ui->balancesTable->horizontalHeader()->restoreState(s.value("baltablegeometry").toByteArray());
    ui->transactionsTable->horizontalHeader()->restoreState(s.value("tratablegeometry").toByteArray());
}

void MainWindow::closeEvent(QCloseEvent* event) {
    QSettings s;

    s.setValue("geometry", saveGeometry());
    s.setValue("baltablegeometry", ui->balancesTable->horizontalHeader()->saveState());
    s.setValue("tratablegeometry", ui->transactionsTable->horizontalHeader()->saveState());

    // Let the RPC know to shutdown any running service.
    rpc->shutdownZcashd();

    // Bubble up
    QMainWindow::closeEvent(event);
}

void MainWindow::turnstileProgress() {
    Ui_TurnstileProgress progress;
    QDialog d(this);
    progress.setupUi(&d);
    Settings::saveRestore(&d);

    QIcon icon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxWarning);
    progress.msgIcon->setPixmap(icon.pixmap(64, 64));

    bool migrationFinished = false;
    auto fnUpdateProgressUI = [=, &migrationFinished] () mutable {
        // Get the plan progress
        if (rpc->getTurnstile()->isMigrationPresent()) {
            auto curProgress = rpc->getTurnstile()->getPlanProgress();
            
            progress.progressTxt->setText(QString::number(curProgress.step) % QString(" / ") % QString::number(curProgress.totalSteps));
            progress.progressBar->setValue(100 * curProgress.step / curProgress.totalSteps);
            
            auto nextTxBlock = curProgress.nextBlock - Settings::getInstance()->getBlockNumber();
            
            progress.fromAddr->setText(curProgress.from);
            progress.toAddr->setText(curProgress.to);

            if (curProgress.step == curProgress.totalSteps) {
                migrationFinished = true;
                auto txt = QString("Turnstile migration finished");
                if (curProgress.hasErrors) {
                    txt = txt + ". There were some errors.\n\nYour funds are all in your wallet, so you should be able to finish moving them manually.";
                }
                progress.nextTx->setText(txt);
            } else {
                progress.nextTx->setText(QString("Next transaction in ") 
                                    % QString::number(nextTxBlock < 0 ? 0 : nextTxBlock)
                                    % " blocks via " % curProgress.via % "\n" 
                                    % (nextTxBlock <= 0 ? "(waiting for confirmations)" : ""));
            }
            
        } else {
            progress.progressTxt->setText("");
            progress.progressBar->setValue(0);
            progress.nextTx->setText("No turnstile migration is in progress");
        }
    };

    QTimer progressTimer(this);        
    QObject::connect(&progressTimer, &QTimer::timeout, fnUpdateProgressUI);
    progressTimer.start(Settings::updateSpeed);
    fnUpdateProgressUI();
    
    auto curProgress = rpc->getTurnstile()->getPlanProgress();

    // Abort button
    if (curProgress.step != curProgress.totalSteps)
        progress.buttonBox->button(QDialogButtonBox::Discard)->setText("Abort");
    else
        progress.buttonBox->button(QDialogButtonBox::Discard)->setVisible(false);

    QObject::connect(progress.buttonBox->button(QDialogButtonBox::Discard), &QPushButton::clicked, [&] () {
        if (curProgress.step != curProgress.totalSteps) {
            auto abort = QMessageBox::warning(this, "Are you sure you want to Abort?",
                                    "Are you sure you want to abort the migration?\nAll further transactions will be cancelled.\nAll your funds are still in your wallet.",
                                    QMessageBox::Yes, QMessageBox::No);
            if (abort == QMessageBox::Yes) {
                rpc->getTurnstile()->removeFile();
                d.close();
                ui->statusBar->showMessage("Automatic Sapling turnstile migration aborted.");
            }
        }
    });

    d.exec();    
    if (migrationFinished || curProgress.step == curProgress.totalSteps) {
        // Finished, so delete the file
        rpc->getTurnstile()->removeFile();
    }    
}

void MainWindow::turnstileDoMigration(QString fromAddr) {
    // Return if there is no connection
    if (rpc->getAllZAddresses() == nullptr)
        return;

    // If a migration is already in progress, show the progress dialog instead
    if (rpc->getTurnstile()->isMigrationPresent()) {
        turnstileProgress();
        return;
    }

    Ui_Turnstile turnstile;
    QDialog d(this);
    turnstile.setupUi(&d);
    Settings::saveRestore(&d);

    QIcon icon = QApplication::style()->standardIcon(QStyle::SP_MessageBoxInformation);
    turnstile.msgIcon->setPixmap(icon.pixmap(64, 64));

    auto fnGetAllSproutBalance = [=] () {
        double bal = 0;
        for (auto addr : *rpc->getAllZAddresses()) {
            if (Settings::getInstance()->isSproutAddress(addr)) {
                bal += rpc->getAllBalances()->value(addr);
            }
        }

        return bal;
    };

    //turnstile.migrateZaddList->addItem("All Sprout z-Addrs");
    turnstile.fromBalance->setText(Settings::getZECUSDDisplayFormat(fnGetAllSproutBalance()));
    for (auto addr : *rpc->getAllZAddresses()) {
        if (Settings::getInstance()->isSaplingAddress(addr)) {
            turnstile.migrateTo->addItem(addr);
        } else {
            turnstile.migrateZaddList->addItem(addr);
        }
    }

    auto fnUpdateSproutBalance = [=] (QString addr) {
        double bal = 0;
        if (addr.startsWith("All")) {
            bal = fnGetAllSproutBalance();
        } else {
            bal = rpc->getAllBalances()->value(addr);
        }

        auto balTxt = Settings::getZECUSDDisplayFormat(bal);
        
        if (bal < Turnstile::minMigrationAmount) {
            turnstile.fromBalance->setStyleSheet("color: red;");
            turnstile.fromBalance->setText(balTxt % " [You need at least " 
                        % Settings::getZECDisplayFormat(Turnstile::minMigrationAmount)
                        % " for automatic migration]");
            turnstile.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
        } else {
            turnstile.fromBalance->setStyleSheet("");
            turnstile.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(true);
            turnstile.fromBalance->setText(balTxt);
        }
    };

    if (!fromAddr.isEmpty())
        turnstile.migrateZaddList->setCurrentText(fromAddr);

    fnUpdateSproutBalance(turnstile.migrateZaddList->currentText());    

    // Combo box selection event
    QObject::connect(turnstile.migrateZaddList, &QComboBox::currentTextChanged, fnUpdateSproutBalance);
        
    // Privacy level combobox
    // Num tx over num blocks
    QList<std::tuple<int, int>> privOptions; 
    privOptions.push_back(std::make_tuple<int, int>(3, 576));
    privOptions.push_back(std::make_tuple<int, int>(5, 1152));
    privOptions.push_back(std::make_tuple<int, int>(10, 2304));

    QObject::connect(turnstile.privLevel, QOverload<int>::of(&QComboBox::currentIndexChanged), [=] (auto idx) {
        // Update the fees
        turnstile.minerFee->setText(
            Settings::getZECUSDDisplayFormat(std::get<0>(privOptions[idx]) * Settings::getMinerFee()));
    });

    for (auto i : privOptions) {
        turnstile.privLevel->addItem(QString::number((int)(std::get<1>(i) / 24 / 24)) % " days (" % // 24 blks/hr * 24 hrs per day
                                     QString::number(std::get<1>(i)) % " blocks, ~" %
                                     QString::number(std::get<0>(i)) % " txns)"
        );
    }
    
    turnstile.buttonBox->button(QDialogButtonBox::Ok)->setText("Start");

    if (d.exec() == QDialog::Accepted) {
        auto privLevel = privOptions[turnstile.privLevel->currentIndex()];
        rpc->getTurnstile()->planMigration(
            turnstile.migrateZaddList->currentText(), 
            turnstile.migrateTo->currentText(),
            std::get<0>(privLevel), std::get<1>(privLevel));

        QMessageBox::information(this, "Backup your wallet.dat", 
                                    "The migration will now start. You can check progress in the File -> Sapling Turnstile menu.\n\nYOU MUST BACKUP YOUR wallet.dat NOW!\n\nNew Addresses have been added to your wallet which will be used for the migration.", 
                                    QMessageBox::Ok);
    }
}

void MainWindow::setupTurnstileDialog() {        
    // Turnstile migration
    QObject::connect(ui->actionTurnstile_Migration, &QAction::triggered, [=] () {
        // If there is current migration that is present, show the progress button
        if (rpc->getTurnstile()->isMigrationPresent())
            turnstileProgress();
        else    
            turnstileDoMigration();        
    });

}

void MainWindow::setupStatusBar() {
    // Status Bar
    loadingLabel = new QLabel();
    loadingMovie = new QMovie(":/icons/res/loading.gif");
    loadingMovie->setScaledSize(QSize(32, 16));
    loadingMovie->start();
    loadingLabel->setAttribute(Qt::WA_NoSystemBackground);
    loadingLabel->setMovie(loadingMovie);

    ui->statusBar->addPermanentWidget(loadingLabel);
    loadingLabel->setVisible(false);

    // Custom status bar menu
    ui->statusBar->setContextMenuPolicy(Qt::CustomContextMenu);
    QObject::connect(ui->statusBar, &QStatusBar::customContextMenuRequested, [=](QPoint pos) {
        auto msg = ui->statusBar->currentMessage();
        QMenu menu(this);

        if (!msg.isEmpty() && msg.startsWith(Settings::txidStatusMessage)) {
            auto txid = msg.split(":")[1].trimmed();
            menu.addAction("Copy txid", [=]() {
                QGuiApplication::clipboard()->setText(txid);
            });
            menu.addAction("View tx on block explorer", [=]() {
                QString url;
                if (Settings::getInstance()->isTestnet()) {
                    url = "https://explorer.testnet.z.cash/tx/" + txid;
                }
                else {
                    url = "https://explorer.zcha.in/transactions/" + txid;
                }
                QDesktopServices::openUrl(QUrl(url));
            });
        }

        menu.addAction("Refresh", [=]() {
            rpc->refresh(true);
        });
        QPoint gpos(mapToGlobal(pos).x(), mapToGlobal(pos).y() + this->height() - ui->statusBar->height());
        menu.exec(gpos);
    });

    statusLabel = new QLabel();
    ui->statusBar->addPermanentWidget(statusLabel);

    statusIcon = new QLabel();
    ui->statusBar->addPermanentWidget(statusIcon);
}

void MainWindow::setupSettingsModal() {    
    // Set up File -> Settings action
    QObject::connect(ui->actionSettings, &QAction::triggered, [=]() {
        QDialog settingsDialog(this);
        Ui_Settings settings;
        settings.setupUi(&settingsDialog);
        Settings::saveRestore(&settingsDialog);

        // Setup save sent check box
        QObject::connect(settings.chkSaveTxs, &QCheckBox::stateChanged, [=](auto checked) {
            Settings::getInstance()->setSaveZtxs(checked);
        });

        // Setup clear button
        QObject::connect(settings.btnClearSaved, &QCheckBox::clicked, [=]() {
            if (QMessageBox::warning(this, "Clear saved history?",
                "Shielded z-Address transactions are stored locally in your wallet, outside zcashd. You may delete this saved information safely any time for your privacy.\nDo you want to delete the saved shielded transactions now?",
                QMessageBox::Yes, QMessageBox::Cancel)) {
                    SentTxStore::deleteHistory();
                    // Reload after the clear button so existing txs disappear
                    rpc->refresh(true);
            }
        });

        // Save sent transactions
        settings.chkSaveTxs->setChecked(Settings::getInstance()->getSaveZtxs());

        // Custom fees
        settings.chkCustomFees->setChecked(Settings::getInstance()->getAllowCustomFees());

        // Connection Settings
        QIntValidator validator(0, 65535);
        settings.port->setValidator(&validator);

        // If values are coming from zcash.conf, then disable all the fields
        auto zcashConfLocation = Settings::getInstance()->getZcashdConfLocation();
        if (!zcashConfLocation.isEmpty()) {
            settings.confMsg->setText("Settings are being read from \n" + zcashConfLocation);
            settings.hostname->setEnabled(false);
            settings.port->setEnabled(false);
            settings.rpcuser->setEnabled(false);
            settings.rpcpassword->setEnabled(false);
        }
        else {
            // Load current values into the dialog        
            auto conf = Settings::getInstance()->getSettings();
            settings.hostname->setText(conf.host);
            settings.port->setText(conf.port);
            settings.rpcuser->setText(conf.rpcuser);
            settings.rpcpassword->setText(conf.rpcpassword);

            settings.confMsg->setText("No local zcash.conf found. Please configure connection manually.");
            settings.hostname->setEnabled(true);
            settings.port->setEnabled(true);
            settings.rpcuser->setEnabled(true);
            settings.rpcpassword->setEnabled(true);
        }

        // Connection tab by default
        settings.tabWidget->setCurrentIndex(0);

        if (settingsDialog.exec() == QDialog::Accepted) {
            // Custom fees
            bool customFees = settings.chkCustomFees->isChecked();
            Settings::getInstance()->setAllowCustomFees(customFees);
            ui->minerFeeAmt->setReadOnly(!customFees);
            if (!customFees)
                ui->minerFeeAmt->setText(Settings::getDecimalString(Settings::getMinerFee()));

            if (zcashConfLocation.isEmpty()) {
                // Save settings
                Settings::getInstance()->saveSettings(
                    settings.hostname->text(),
                    settings.port->text(),
                    settings.rpcuser->text(),
                    settings.rpcpassword->text());
                
                auto cl = new ConnectionLoader(this, rpc);
                cl->loadConnection();
            }
        }
    });
}

void MainWindow::addressBook() {
    // Check to see if there is a target.
    QRegExp re("Address[0-9]+", Qt::CaseInsensitive);
    for (auto target: ui->sendToWidgets->findChildren<QLineEdit *>(re)) {
        if (target->hasFocus()) {
            AddressBook::open(this, target);
            return;
        }
    };

    // If there was no target, then just run with no target.
    AddressBook::open(this);
}


void MainWindow::donate() {
    // Set up a donation to me :)
    ui->Address1->setText(Settings::getDonationAddr(
                                Settings::getInstance()->isSaplingAddress(ui->inputsCombo->currentText())));
    ui->Address1->setCursorPosition(0);
    ui->Amount1->setText("0.01");
    ui->MemoTxt1->setText("Thanks for supporting zec-qt-wallet!");

    ui->statusBar->showMessage("Donate 0.01 " % Settings::getTokenName() % " to support zec-qt-wallet");

    // And switch to the send tab.
    ui->tabWidget->setCurrentIndex(1);
}

void MainWindow::postToZBoard() {
    QDialog d(this);
    Ui_zboard zb;
    zb.setupUi(&d);
    Settings::saveRestore(&d);

    if (rpc->getConnection() == nullptr)
        return;

    // Fill the from field with sapling addresses.
    for (auto i = rpc->getAllBalances()->keyBegin(); i != rpc->getAllBalances()->keyEnd(); i++) {
        if (Settings::getInstance()->isSaplingAddress(*i) && rpc->getAllBalances()->value(*i) > 0) {
            zb.fromAddr->addItem(*i);
        }
    }

    QMap<QString, QString> topics;
    // Insert the main topic automatically
    topics.insert("#Main_Area", Settings::getInstance()->isTestnet() ? Settings::getDonationAddr(true) : Settings::getZboardAddr());
    zb.topicsList->addItem(topics.firstKey());
    // Then call the API to get topics, and if it returns successfully, then add the rest of the topics
    rpc->getZboardTopics([&](QMap<QString, QString> topicsMap) {
        for (auto t : topicsMap.keys()) {
            topics.insert(t, Settings::getInstance()->isTestnet() ? Settings::getDonationAddr(true) : topicsMap[t]);
            zb.topicsList->addItem(t);
        }
    });

    // Testnet warning
    if (Settings::getInstance()->isTestnet()) {
        zb.testnetWarning->setText("You are on testnet, your post won't actually appear on z-board.net");
    }
    else {
        zb.testnetWarning->setText("");
    }

    QRegExpValidator v(QRegExp("^[a-zA-Z0-9_]{3,20}$"), zb.postAs);
    zb.postAs->setValidator(&v);

    zb.feeAmount->setText(Settings::getZECUSDDisplayFormat(Settings::getZboardAmount() + Settings::getMinerFee()));

    auto fnBuildNameMemo = [=]() -> QString {
        auto memo = zb.memoTxt->toPlainText().trimmed();
        if (!zb.postAs->text().trimmed().isEmpty())
            memo = zb.postAs->text().trimmed() + ":: " + memo;
        return memo;
    };

    auto fnUpdateMemoSize = [=]() {
        QString txt = fnBuildNameMemo();
        zb.memoSize->setText(QString::number(txt.toUtf8().size()) + "/512");

        if (txt.toUtf8().size() <= 512) {
            // Everything is fine
            zb.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(true);
            zb.memoSize->setStyleSheet("");
        }
        else {
            // Overweight
            zb.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
            zb.memoSize->setStyleSheet("color: red;");
        }

        // Disallow blank memos
        if (zb.memoTxt->toPlainText().trimmed().isEmpty()) {
            zb.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
        }
        else {
            zb.buttonBox->button(QDialogButtonBox::Ok)->setEnabled(true);
        }
    };

    // Memo text changed
    QObject::connect(zb.memoTxt, &QPlainTextEdit::textChanged, fnUpdateMemoSize);
    QObject::connect(zb.postAs, &QLineEdit::textChanged, fnUpdateMemoSize);

    zb.memoTxt->setFocus();
    fnUpdateMemoSize();

    if (d.exec() == QDialog::Accepted) {
        // Create a transaction.
        Tx tx;
        
        // Send from your first sapling address that has a balance.
        tx.fromAddr = zb.fromAddr->currentText();
        if (tx.fromAddr.isEmpty()) {
            QMessageBox::critical(this, "Error Posting Message", "You need a sapling address with available balance to post", QMessageBox::Ok);
            return;
        }

        auto memo = zb.memoTxt->toPlainText().trimmed();
        if (!zb.postAs->text().trimmed().isEmpty())
            memo = zb.postAs->text().trimmed() + ":: " + memo;

        auto toAddr = topics[zb.topicsList->currentText()];
        tx.toAddrs.push_back(ToFields{ toAddr, Settings::getZboardAmount(), memo, memo.toUtf8().toHex() });
        tx.fee = Settings::getMinerFee();

        json params = json::array();
        rpc->fillTxJsonParams(params, tx);
        std::cout << std::setw(2) << params << std::endl;

        // And send the Tx
        rpc->sendZTransaction(params, [=](const json& reply) {
            QString opid = QString::fromStdString(reply.get<json::string_t>());
            ui->statusBar->showMessage("Computing Tx: " % opid);

            // And then start monitoring the transaction
            rpc->addNewTxToWatch(tx, opid);
        });
    }
}

void MainWindow::doImport(QList<QString>* keys) {
    if (rpc->getConnection() == nullptr) {
        // No connection, just return
        return;
    }

    if (keys->isEmpty()) {
        delete keys;

        QMessageBox::information(this,
            "Imported", "The keys were imported. It may take several minutes to rescan the blockchain. Until then, functionality may be limited",
            QMessageBox::Ok);
        ui->statusBar->showMessage("Private key import rescan finished");
        return;
    }

    // Pop the first key
    QString key = keys->first();
    keys->pop_front();
    bool rescan = keys->isEmpty();

    if (key.startsWith("S") ||
        key.startsWith("secret")) { // Z key
        rpc->importZPrivKey(key, rescan, [=] (auto) { this->doImport(keys); });                   
    } else {
        rpc->importTPrivKey(key, rescan, [=] (auto) { this->doImport(keys); });
    }
}


void MainWindow::importPrivKey() {
    QDialog d(this);
    Ui_PrivKey pui;
    pui.setupUi(&d);
    Settings::saveRestore(&d);

    pui.buttonBox->button(QDialogButtonBox::Save)->setVisible(false);
    pui.helpLbl->setText(QString() %
                        "Please paste your private keys (z-Addr or t-Addr) here, one per line.\n" %
                        "The keys will be imported into your connected zcashd node");  

    if (d.exec() == QDialog::Accepted && !pui.privKeyTxt->toPlainText().trimmed().isEmpty()) {
        auto rawkeys = pui.privKeyTxt->toPlainText().trimmed().split("\n");

        QList<QString> keysTmp;
        // Filter out all the empty keys.
        std::copy_if(rawkeys.begin(), rawkeys.end(), std::back_inserter(keysTmp), [=] (auto key) {
            return !key.startsWith("#") && !key.trimmed().isEmpty();
        });

        auto keys = new QList<QString>();
        std::transform(keysTmp.begin(), keysTmp.end(), std::back_inserter(*keys), [=](auto key) {
            return key.trimmed().split(" ")[0];
        });

        // Start the import. The function takes ownership of keys
        doImport(keys);
    }
}

/**
 * Backup the wallet.dat file. This is kind of a hack, since it has to read from the filesystem rather than an RPC call
 * This might fail for various reasons - Remote zcashd, non-standard locations, custom params passed to zcashd, many others
*/
void MainWindow::backupWalletDat() {
    if (!rpc->getConnection())
        return;

    QDir zcashdir(rpc->getConnection()->config->zcashDir);
    QString backupDefaultName = "zcash-wallet-backup-" + QDateTime::currentDateTime().toString("yyyyMMdd") + ".dat";

    if (Settings::getInstance()->isTestnet()) {
        zcashdir.cd("testnet3");
        backupDefaultName = "tesetnet-" + backupDefaultName;
    }
    
    QFile wallet(zcashdir.filePath("wallet.dat"));
    if (!wallet.exists()) {
        QMessageBox::critical(this, "No wallet.dat", "Couldn't find the wallet.dat on this computer."
            "You need to back it up from the machine zcashd is running on", QMessageBox::Ok);
        return;
    }
    
    QUrl backupName = QFileDialog::getSaveFileUrl(this, "Backup wallet.dat", backupDefaultName, "Data file (*.dat)");
    if (backupName.isEmpty())
        return;

    if (!wallet.copy(backupName.toLocalFile())) {
        QMessageBox::critical(this, "Couldn't backup", "Couldn't backup the wallet.dat file."
            "You need to back it up manually.", QMessageBox::Ok);
    }
}

void MainWindow::exportAllKeys() {
    QDialog d(this);
    Ui_PrivKey pui;
    pui.setupUi(&d);
    
    // Make the window big by default
    auto ps = this->geometry();
    QMargins margin = QMargins() + 50;
    d.setGeometry(ps.marginsRemoved(margin));

    Settings::saveRestore(&d);

    pui.privKeyTxt->setPlainText("Loading...");
    pui.privKeyTxt->setReadOnly(true);
    pui.privKeyTxt->setLineWrapMode(QPlainTextEdit::LineWrapMode::NoWrap);
    pui.helpLbl->setText("These are all the private keys for all the addresses in your wallet");

    // Disable the save button until it finishes loading
    pui.buttonBox->button(QDialogButtonBox::Save)->setEnabled(false);
    pui.buttonBox->button(QDialogButtonBox::Ok)->setVisible(false);

    // Wire up save button
    QObject::connect(pui.buttonBox->button(QDialogButtonBox::Save), &QPushButton::clicked, [=] () {
        QString fileName = QFileDialog::getSaveFileName(this, tr("Save File"),
                           "zcash-all-privatekeys.txt");
        QFile file(fileName);
        if (!file.open(QIODevice::WriteOnly)) {
            QMessageBox::information(this, tr("Unable to open file"), file.errorString());
            return;
        }        
        QTextStream out(&file);
        out << pui.privKeyTxt->toPlainText();
    });

    // Call the API
    auto isDialogAlive = std::make_shared<bool>(true);
    rpc->getAllPrivKeys([=] (auto privKeys) {
        // Check to see if we are still showing.
        if (! *isDialogAlive.get()) return;

        QString allKeysTxt;
        for (auto keypair : privKeys) {
            allKeysTxt = allKeysTxt % keypair.second % " # addr=" % keypair.first % "\n";
        }

        pui.privKeyTxt->setPlainText(allKeysTxt);
        pui.buttonBox->button(QDialogButtonBox::Save)->setEnabled(true);
    });

    d.exec();
    *isDialogAlive.get() = false;
}

void MainWindow::setupBalancesTab() {
    ui->unconfirmedWarning->setVisible(false);

    // Double click on balances table
    auto fnDoSendFrom = [=](const QString& addr, const QString& to = QString(), bool sendMax = false) {
        // Find the inputs combo
        for (int i = 0; i < ui->inputsCombo->count(); i++) {
            if (ui->inputsCombo->itemText(i).startsWith(addr)) {
                ui->inputsCombo->setCurrentIndex(i);
                break;
            }
        }

        // If there's a to address, add that as well
        if (!to.isEmpty()) {
            // Remember to clear any existing address fields, because we are creating a new transaction.
            this->removeExtraAddresses();
            ui->Address1->setText(to);
        }

        // See if max button has to be checked
        if (sendMax) {
            ui->Max1->setChecked(true);
        }

        // And switch to the send tab.
        ui->tabWidget->setCurrentIndex(1);
    };

    // Double click opens up memo if one exists
    QObject::connect(ui->balancesTable, &QTableView::doubleClicked, [=](auto index) {
        index = index.sibling(index.row(), 0);
        auto addr = ui->balancesTable->model()->data(index).toString();
        
        fnDoSendFrom(addr);
    });

    // Setup context menu on balances tab
    ui->balancesTable->setContextMenuPolicy(Qt::CustomContextMenu);
    QObject::connect(ui->balancesTable, &QTableView::customContextMenuRequested, [=] (QPoint pos) {
        QModelIndex index = ui->balancesTable->indexAt(pos);
        if (index.row() < 0) return;

        index = index.sibling(index.row(), 0);
        auto addr = ui->balancesTable->model()->data(index).toString();

        QMenu menu(this);

        menu.addAction("Copy address", [=] () {
            QClipboard *clipboard = QGuiApplication::clipboard();
            clipboard->setText(addr);            
            ui->statusBar->showMessage("Copied to clipboard", 3 * 1000);
        });

        menu.addAction("Get private key", [=] () {
            auto fnCB = [=] (const json& reply) {
                auto privKey = QString::fromStdString(reply.get<json::string_t>());
                QDialog d(this);
                Ui_PrivKey pui;                
                pui.setupUi(&d);

                pui.helpLbl->setText("Private Key:");
                pui.privKeyTxt->setPlainText(privKey);
                pui.privKeyTxt->setReadOnly(true);
                pui.privKeyTxt->selectAll();
                pui.buttonBox->button(QDialogButtonBox::Save)->setVisible(false);
                pui.buttonBox->button(QDialogButtonBox::Ok)->setVisible(false);

                d.exec();
            };

            if (Settings::getInstance()->isZAddress(addr)) 
                rpc->getZPrivKey(addr, fnCB);
            else
                rpc->getTPrivKey(addr, fnCB);
        });

        menu.addAction("Send from " % addr.left(40) % (addr.size() > 40 ? "..." : ""), [=]() {
            fnDoSendFrom(addr);
        });

        if (addr.startsWith("t")) {
            auto defaultSapling = rpc->getDefaultSaplingAddress();
            if (!defaultSapling.isEmpty()) {
                menu.addAction("Shield balance to Sapling", [=] () {
                    fnDoSendFrom(addr, defaultSapling, true);
                });
            }

            menu.addAction("View on block explorer", [=] () {
                QString url;
                if (Settings::getInstance()->isTestnet()) {
                    url = "https://explorer.testnet.z.cash/address/" + addr;
                } else {
                    url = "https://explorer.zcha.in/accounts/" + addr;
                }
                QDesktopServices::openUrl(QUrl(url));
            });
        }

        if (Settings::getInstance()->isSproutAddress(addr)) {
            menu.addAction("Migrate to Sapling", [=] () {
                this->turnstileDoMigration(addr);
            });
        }

        menu.exec(ui->balancesTable->viewport()->mapToGlobal(pos));            
    });
}

void MainWindow::setupZcashdTab() {    
    ui->zcashdlogo->setBasePixmap(QPixmap(":/img/res/zcashdlogo.gif"));
}

void MainWindow::setupTransactionsTab() {
    // Double click opens up memo if one exists
    QObject::connect(ui->transactionsTable, &QTableView::doubleClicked, [=] (auto index) {
        auto txModel = dynamic_cast<TxTableModel *>(ui->transactionsTable->model());
        QString memo = txModel->getMemo(index.row());

        if (!memo.isEmpty()) {
            QMessageBox::information(this, "Memo", memo, QMessageBox::Ok);
        }
    });

    // Set up context menu on transactions tab
    ui->transactionsTable->setContextMenuPolicy(Qt::CustomContextMenu);
    // Table right click
    QObject::connect(ui->transactionsTable, &QTableView::customContextMenuRequested, [=] (QPoint pos) {
        QModelIndex index = ui->transactionsTable->indexAt(pos);
        if (index.row() < 0) return;

        QMenu menu(this);

        auto txModel = dynamic_cast<TxTableModel *>(ui->transactionsTable->model());

        QString txid = txModel->getTxId(index.row());
        QString memo = txModel->getMemo(index.row());
        QString addr = txModel->getAddr(index.row());

        menu.addAction("Copy txid", [=] () {            
            QGuiApplication::clipboard()->setText(txid);
            ui->statusBar->showMessage("Copied to clipboard", 3 * 1000);
        });

        if (!addr.isEmpty()) {
            menu.addAction("Copy address", [=] () {
                QGuiApplication::clipboard()->setText(addr);
                ui->statusBar->showMessage("Copied to clipboard", 3 * 1000);
            });
        }

        menu.addAction("View on block explorer", [=] () {
            QString url;
            if (Settings::getInstance()->isTestnet()) {
                url = "https://explorer.testnet.z.cash/tx/" + txid;
            } else {
                url = "https://explorer.zcha.in/transactions/" + txid;
            }
            QDesktopServices::openUrl(QUrl(url));
        });

        if (!memo.isEmpty()) {
            menu.addAction("View Memo", [=] () {
                QMessageBox::information(this, "Memo", memo, QMessageBox::Ok);
            });
        }

        menu.exec(ui->transactionsTable->viewport()->mapToGlobal(pos));        
    });
}

void MainWindow::addNewZaddr(bool sapling) {

    rpc->newZaddr(sapling, [=] (json reply) {
        QString addr = QString::fromStdString(reply.get<json::string_t>());
        // Make sure the RPC class reloads the z-addrs for future use
        rpc->refreshAddresses();

        // Just double make sure the z-address is still checked
        if (( sapling && ui->rdioZSAddr->isChecked()) ||
            (!sapling && ui->rdioZAddr->isChecked())) {
            ui->listRecieveAddresses->insertItem(0, addr);
            ui->listRecieveAddresses->setCurrentIndex(0);

            ui->statusBar->showMessage(QString::fromStdString("Created new zAddr") %
                                       (sapling ? "(Sapling)" : "(Sprout)"), 
                                       10 * 1000);
        }
    });
}


// Adds sapling or sprout z-addresses to the combo box. Technically, returns a
// lambda, which can be connected to the appropriate signal
std::function<void(bool)> MainWindow::addZAddrsToComboList(bool sapling) {
    return [=] (bool checked) { 
        if (checked && this->rpc->getAllZAddresses() != nullptr) { 
            auto addrs = this->rpc->getAllZAddresses();
            ui->listRecieveAddresses->clear();

            std::for_each(addrs->begin(), addrs->end(), [=] (auto addr) {
                if ( (sapling &&  Settings::getInstance()->isSaplingAddress(addr)) ||
                    (!sapling && !Settings::getInstance()->isSaplingAddress(addr)))
                    ui->listRecieveAddresses->addItem(addr);
            }); 

            // If z-addrs are empty, then create a new one.
            if (addrs->isEmpty()) {
                addNewZaddr(sapling);
            }
        } 
    };
}

void MainWindow::setupRecieveTab() {
    auto addNewTAddr = [=] () {
        rpc->newTaddr([=] (json reply) {
                QString addr = QString::fromStdString(reply.get<json::string_t>());

                // Just double make sure the t-address is still checked
                if (ui->rdioTAddr->isChecked()) {
                    ui->listRecieveAddresses->insertItem(0, addr);
                    ui->listRecieveAddresses->setCurrentIndex(0);

                    ui->statusBar->showMessage("Created new t-Addr", 10 * 1000);
                }
            });
    };

    // Connect t-addr radio button
    QObject::connect(ui->rdioTAddr, &QRadioButton::toggled, [=] (bool checked) { 
        // Whenever the t-address is selected, we generate a new address, because we don't
        // want to reuse t-addrs
        if (checked && this->rpc->getUTXOs() != nullptr) { 
            auto utxos = this->rpc->getUTXOs();
            ui->listRecieveAddresses->clear();

            std::for_each(utxos->begin(), utxos->end(), [=] (auto& utxo) {
                auto addr = utxo.address;
                if (addr.startsWith("t") && ui->listRecieveAddresses->findText(addr) < 0) {
                    ui->listRecieveAddresses->addItem(addr);
                }
            });

            addNewTAddr();
        } 
    });


    // zAddr toggle button, one for sprout and one for sapling
    QObject::connect(ui->rdioZAddr,  &QRadioButton::toggled, addZAddrsToComboList(false));
    QObject::connect(ui->rdioZSAddr, &QRadioButton::toggled, addZAddrsToComboList(true));

    // Explicitly get new address button.
    QObject::connect(ui->btnRecieveNewAddr, &QPushButton::clicked, [=] () {
        if (!rpc->getConnection())
            return;

        if (ui->rdioZAddr->isChecked()) {
            QString syncMsg = !Settings::getInstance()->isSaplingActive() ? "Please wait for your node to finish syncing to create Sapling addresses.\n\n" : "";
            auto confirm = QMessageBox::question(this, "Sprout Address",
                syncMsg + "Sprout addresses are inefficient, and will be deprecated in the future in favour of Sapling addresses.\n"
                "Are you sure you want to create a new Sprout address?", QMessageBox::Yes, QMessageBox::No);
            if (confirm != QMessageBox::Yes)
                return;
            
            addNewZaddr(false); 
        } else if (ui->rdioZSAddr->isChecked()) {
            addNewZaddr(true);
        } else if (ui->rdioTAddr->isChecked()) {
            addNewTAddr();
        }
    });

    // Focus enter for the Receive Tab
    QObject::connect(ui->tabWidget, &QTabWidget::currentChanged, [=] (int tab) {
        if (tab == 2) {
            // Switched to receive tab, so update everything. 

            // Hide Sapling radio button if Sapling is not active
            if (Settings::getInstance()->isSaplingActive()) {
                ui->rdioZSAddr->setVisible(true);    
                ui->rdioZSAddr->setChecked(true);
                ui->rdioZAddr->setText("z-Addr(Sprout)");
            } else {
                ui->rdioZSAddr->setVisible(false);    
                ui->rdioZAddr->setChecked(true);
                ui->rdioZAddr->setText("z-Addr");   // Don't use the "Sprout" label if there's no Sapling
            }
            
            // And then select the first one
            ui->listRecieveAddresses->setCurrentIndex(0);
        }
    });

    // Select item in address list
    QObject::connect(ui->listRecieveAddresses, 
        QOverload<const QString &>::of(&QComboBox::currentIndexChanged), [=] (const QString& addr) {
        if (addr.isEmpty()) {
            // Draw empty stuff

            ui->txtRecieve->clear();
            ui->qrcodeDisplay->clear();
            return;
        }

        ui->txtRecieve->setPlainText(addr);       
        ui->qrcodeDisplay->setAddress(addr);
    });    

}

MainWindow::~MainWindow()
{
    delete ui;
    delete rpc;
    delete labelCompleter;

    delete loadingMovie;
    delete logger;
}