text: /*
   * Qt4 bitcoin GUI.
   *
   * W.J. van der Laan 2011-2012
   * The Bitcoin Developers 2011-2012
   */
  
  #include <QApplication>
  
  #include "bitcoingui.h"
  
  #include "transactiontablemodel.h"
  #include "addressbookpage.h"
  #include "sendcoinsdialog.h"
  #include "signverifymessagedialog.h"
  #include "optionsdialog.h"
  #include "aboutdialog.h"
  #include "clientmodel.h"
  #include "walletmodel.h"
  #include "editaddressdialog.h"
  #include "optionsmodel.h"
  #include "transactiondescdialog.h"
  #include "addresstablemodel.h"
  #include "transactionview.h"
  #include "overviewpage.h"
  #include "bitcoinunits.h"
  #include "guiconstants.h"
  #include "askpassphrasedialog.h"
  #include "notificator.h"
  #include "guiutil.h"
  #include "rpcconsole.h"
  #include "wallet.h"
  #include "init.h"
  #include "ui_interface.h"
  
  #ifdef Q_OS_MAC
  #include "macdockiconhandler.h"
  #endif
  
  #include <QMenuBar>
  #include <QMenu>
  #include <QIcon>
  #include <QVBoxLayout>
  #include <QToolBar>
  #include <QStatusBar>
  #include <QLabel>
  #include <QMessageBox>
  #include <QMimeData>
  #include <QProgressBar>
  #include <QStackedWidget>
  #include <QDateTime>
  #include <QMovie>
  #include <QFileDialog>
  #include <QDesktopServices>
  #include <QTimer>
  #include <QDragEnterEvent>
  #include <QUrl>
  #include <QMimeData>
  #include <QStyle>
  
  #include <iostream>
  
  extern CWallet* pwalletMain;
  extern int64_t nLastCoinStakeSearchInterval;
  double GetPoSKernelPS();
  
  BitcoinGUI::BitcoinGUI(QWidget *parent):
      QMainWindow(parent),
      clientModel(0),
      walletModel(0),
      toolbar(0),
      encryptWalletAction(0),
      changePassphraseAction(0),
      unlockWalletAction(0),
      lockWalletAction(0),
      aboutQtAction(0),
      trayIcon(0),
      notificator(0),
      rpcConsole(0),
      prevBlocks(0),
      nWeight(0)
  {
      resize(850+95, 550);
      setWindowTitle(tr("Zong") + " - " + tr("Wallet"));
  #ifndef Q_OS_MAC
      qApp->setWindowIcon(QIcon(":icons/bitcoin"));
      setWindowIcon(QIcon(":icons/bitcoin"));
  #else
      //setUnifiedTitleAndToolBarOnMac(true);
      QApplication::setAttribute(Qt::AA_DontShowIconsInMenus);
  #endif
      // Accept D&D of URIs
      setAcceptDrops(true);
  
      // Create actions for the toolbar, menu bar and tray/dock icon
      createActions();
  
      // Create application menu bar
      createMenuBar();
  
      // Create the toolbars
      createToolBars();
  
      // Create the tray icon (or setup the dock icon)
      createTrayIcon();
  
      // Create tabs
      overviewPage = new OverviewPage();
  
      transactionsPage = new QWidget(this);
      QVBoxLayout *vbox = new QVBoxLayout();
      transactionView = new TransactionView(this);
      vbox->addWidget(transactionView);
      transactionsPage->setLayout(vbox);
  
      addressBookPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::SendingTab);
  
      receiveCoinsPage = new AddressBookPage(AddressBookPage::ForEditing, AddressBookPage::ReceivingTab);
  
      sendCoinsPage = new SendCoinsDialog(this);
  
      signVerifyMessageDialog = new SignVerifyMessageDialog(this);
  
      centralStackedWidget = new QStackedWidget(this);
      centralStackedWidget->addWidget(overviewPage);
      centralStackedWidget->addWidget(transactionsPage);
      centralStackedWidget->addWidget(addressBookPage);
      centralStackedWidget->addWidget(receiveCoinsPage);
      centralStackedWidget->addWidget(sendCoinsPage);
  
      QWidget *centralWidget = new QWidget();
      QVBoxLayout *centralLayout = new QVBoxLayout(centralWidget);
  #ifndef Q_OS_MAC
      centralLayout->addWidget(appMenuBar);
  #endif
      centralLayout->addWidget(centralStackedWidget);
  
      setCentralWidget(centralWidget);
  
      // Create status bar
      statusBar();
  
      // Status bar notification icons
      QWidget *frameBlocks = new QWidget();
      frameBlocks->setContentsMargins(0,0,0,0);
      frameBlocks->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
      frameBlocks->setStyleSheet("QWidget { background: none; margin-bottom: 5px; }");
      QHBoxLayout *frameBlocksLayout = new QHBoxLayout(frameBlocks);
      frameBlocksLayout->setContentsMargins(3,0,3,0);
      frameBlocksLayout->setSpacing(3);
      frameBlocksLayout->setAlignment(Qt::AlignHCenter);
      labelEncryptionIcon = new QLabel();
      labelStakingIcon = new QLabel();
      labelConnectionsIcon = new QLabel();
      labelBlocksIcon = new QLabel();
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(labelEncryptionIcon);
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(labelStakingIcon);
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(labelConnectionsIcon);
      frameBlocksLayout->addStretch();
      frameBlocksLayout->addWidget(labelBlocksIcon);
      frameBlocksLayout->addStretch();
      toolbar->addWidget(frameBlocks);
  
      if (GetBoolArg("-staking", true))
      {
          QTimer *timerStakingIcon = new QTimer(labelStakingIcon);
          connect(timerStakingIcon, SIGNAL(timeout()), this, SLOT(updateStakingIcon()));
          timerStakingIcon->start(30 * 1000);
          updateStakingIcon();
      }
  
      // Progress bar and label for blocks download
      progressBarLabel = new QLabel();
      progressBarLabel->setVisible(false);
      progressBar = new QProgressBar();
      progressBar->setAlignment(Qt::AlignCenter);
      progressBar->setVisible(false);
  
      statusBar()->addWidget(progressBarLabel);
      statusBar()->addWidget(progressBar);
  
      syncIconMovie = new QMovie(":/movies/update_spinner", "mng", this);
  
      // Clicking on a transaction on the overview page simply sends you to transaction history page
      connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), this, SLOT(gotoHistoryPage()));
      connect(overviewPage, SIGNAL(transactionClicked(QModelIndex)), transactionView, SLOT(focusTransaction(QModelIndex)));
  
      // Double-clicking on a transaction on the transaction history page shows details
      connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));
  
      rpcConsole = new RPCConsole(this);
      connect(openRPCConsoleAction, SIGNAL(triggered()), rpcConsole, SLOT(show()));
      // prevents an oben debug window from becoming stuck/unusable on client shutdown
      connect(quitAction, SIGNAL(triggered()), rpcConsole, SLOT(hide()));
  
      // Clicking on "Verify Message" in the address book sends you to the verify message tab
      connect(addressBookPage, SIGNAL(verifyMessage(QString)), this, SLOT(gotoVerifyMessageTab(QString)));
      // Clicking on "Sign Message" in the receive coins page sends you to the sign message tab
      connect(receiveCoinsPage, SIGNAL(signMessage(QString)), this, SLOT(gotoSignMessageTab(QString)));
  
      gotoOverviewPage();
  }
  
  BitcoinGUI::~BitcoinGUI()
  {
      if(trayIcon) // Hide tray icon, as deleting will let it linger until quit (on Ubuntu)
          trayIcon->hide();
  #ifdef Q_OS_MAC
      delete appMenuBar;
  #endif
  }
  
  void BitcoinGUI::createActions()
  {
      QActionGroup *tabGroup = new QActionGroup(this);
  
      overviewAction = new QAction(QIcon(":/icons/overview"), tr("&Dashboard"), this);
      overviewAction->setToolTip(tr("Show general overview of wallet"));
      overviewAction->setCheckable(true);
      overviewAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_1));
      tabGroup->addAction(overviewAction);
  
      receiveCoinsAction = new QAction(QIcon(":/icons/receiving_addresses"), tr("&Receive"), this);
      receiveCoinsAction->setToolTip(tr("Show the list of addresses for receiving payments"));
      receiveCoinsAction->setCheckable(true);
      receiveCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_2));
      tabGroup->addAction(receiveCoinsAction);
  
      sendCoinsAction = new QAction(QIcon(":/icons/send"), tr("&Send"), this);
      sendCoinsAction->setToolTip(tr("Send coins to a Zong address"));
      sendCoinsAction->setCheckable(true);
      sendCoinsAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_3));
      tabGroup->addAction(sendCoinsAction);
  
      historyAction = new QAction(QIcon(":/icons/history"), tr("&Transactions"), this);
      historyAction->setToolTip(tr("Browse transaction history"));
      historyAction->setCheckable(true);
      historyAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_4));
      tabGroup->addAction(historyAction);
  
      addressBookAction = new QAction(QIcon(":/icons/address-book"), tr("&Address Book"), this);
      addressBookAction->setToolTip(tr("Edit the list of stored addresses and labels"));
      addressBookAction->setCheckable(true);
      addressBookAction->setShortcut(QKeySequence(Qt::ALT + Qt::Key_5));
      tabGroup->addAction(addressBookAction);
  
      connect(overviewAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
      connect(overviewAction, SIGNAL(triggered()), this, SLOT(gotoOverviewPage()));
      connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
      connect(receiveCoinsAction, SIGNAL(triggered()), this, SLOT(gotoReceiveCoinsPage()));
      connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
      connect(sendCoinsAction, SIGNAL(triggered()), this, SLOT(gotoSendCoinsPage()));
      connect(historyAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
      connect(historyAction, SIGNAL(triggered()), this, SLOT(gotoHistoryPage()));
      connect(addressBookAction, SIGNAL(triggered()), this, SLOT(showNormalIfMinimized()));
      connect(addressBookAction, SIGNAL(triggered()), this, SLOT(gotoAddressBookPage()));
  
      quitAction = new QAction(tr("E&xit"), this);
      quitAction->setToolTip(tr("Quit application"));
      quitAction->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q));
      quitAction->setMenuRole(QAction::QuitRole);
      aboutAction = new QAction(tr("&About Zong"), this);
      aboutAction->setToolTip(tr("Show information about Zong"));
      aboutAction->setMenuRole(QAction::AboutRole);
      aboutQtAction = new QAction(tr("About &Qt"), this);
      aboutQtAction->setToolTip(tr("Show information about Qt"));
      aboutQtAction->setMenuRole(QAction::AboutQtRole);
      optionsAction = new QAction(tr("&Options..."), this);
      optionsAction->setToolTip(tr("Modify configuration options for Zong"));
      optionsAction->setMenuRole(QAction::PreferencesRole);
      toggleHideAction = new QAction(QIcon(":/icons/bitcoin"), tr("&Show / Hide"), this);
      encryptWalletAction = new QAction(tr("&Encrypt Wallet..."), this);
      encryptWalletAction->setToolTip(tr("Encrypt or decrypt wallet"));
      backupWalletAction = new QAction(tr("&Backup Wallet..."), this);
      backupWalletAction->setToolTip(tr("Backup wallet to another location"));
      changePassphraseAction = new QAction(tr("&Change Passphrase..."), this);
      changePassphraseAction->setToolTip(tr("Change the passphrase used for wallet encryption"));
      unlockWalletAction = new QAction(tr("&Unlock Wallet..."), this);
      unlockWalletAction->setToolTip(tr("Unlock wallet"));
      lockWalletAction = new QAction(tr("&Lock Wallet"), this);
      lockWalletAction->setToolTip(tr("Lock wallet"));
      signMessageAction = new QAction(tr("Sign &message..."), this);
      verifyMessageAction = new QAction(tr("&Verify message..."), this);
  
      exportAction = new QAction(tr("&Export..."), this);
      exportAction->setToolTip(tr("Export the data in the current tab to a file"));
      openRPCConsoleAction = new QAction(tr("&Debug window"), this);
      openRPCConsoleAction->setToolTip(tr("Open debugging and diagnostic console"));
  
      connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
      connect(aboutAction, SIGNAL(triggered()), this, SLOT(aboutClicked()));
      connect(aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
      connect(optionsAction, SIGNAL(triggered()), this, SLOT(optionsClicked()));
      connect(toggleHideAction, SIGNAL(triggered()), this, SLOT(toggleHidden()));
      connect(encryptWalletAction, SIGNAL(triggered()), this, SLOT(encryptWallet()));
      connect(backupWalletAction, SIGNAL(triggered()), this, SLOT(backupWallet()));
      connect(changePassphraseAction, SIGNAL(triggered()), this, SLOT(changePassphrase()));
      connect(unlockWalletAction, SIGNAL(triggered()), this, SLOT(unlockWallet()));
      connect(lockWalletAction, SIGNAL(triggered()), this, SLOT(lockWallet()));
      connect(signMessageAction, SIGNAL(triggered()), this, SLOT(gotoSignMessageTab()));
      connect(verifyMessageAction, SIGNAL(triggered()), this, SLOT(gotoVerifyMessageTab()));
  }
  
  void BitcoinGUI::createMenuBar()
  {
      // workaround for unity's global menu
      if (qgetenv("QT_QPA_PLATFORMTHEME") == "appmenu-qt5")
          appMenuBar = menuBar();
      else
          appMenuBar = new QMenuBar();
  
      // Configure the menus
      QMenu *file = appMenuBar->addMenu(tr("&File"));
      file->addAction(backupWalletAction);
      file->addAction(exportAction);
      file->addAction(signMessageAction);
      file->addAction(verifyMessageAction);
      file->addSeparator();
      file->addAction(quitAction);
  
  
      QMenu *settings = appMenuBar->addMenu(tr("&Settings"));
      settings->addAction(encryptWalletAction);
      settings->addAction(changePassphraseAction);
      settings->addAction(unlockWalletAction);
      settings->addAction(lockWalletAction);
      settings->addSeparator();
      settings->addAction(optionsAction);
  
      QMenu *help = appMenuBar->addMenu(tr("&Help"));
      help->addAction(openRPCConsoleAction);
      help->addSeparator();
      help->addAction(aboutAction);
      help->addAction(aboutQtAction);
  }
  
  static QWidget* makeToolBarSpacer()
  {
      QWidget* spacer = new QWidget();
      spacer->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
      spacer->setStyleSheet("QWidget { background: none; }");
      return spacer;
  }
  
  void BitcoinGUI::createToolBars()
  {
      toolbar = new QToolBar(tr("Tabs toolbar"));
      toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
      toolbar->setContextMenuPolicy(Qt::PreventContextMenu);
  
      toolbar->addAction(overviewAction);
      toolbar->addAction(receiveCoinsAction);
      toolbar->addAction(sendCoinsAction);
      toolbar->addAction(historyAction);
      toolbar->addAction(addressBookAction);
  
      toolbar->addWidget(makeToolBarSpacer());
  
      toolbar->setOrientation(Qt::Vertical);
      toolbar->setMovable(false);
  
      addToolBar(Qt::LeftToolBarArea, toolbar);
  
      int w = 0;
  
      foreach(QAction *action, toolbar->actions()) {
          w = std::max(w, toolbar->widgetForAction(action)->width());
      }
  
      foreach(QAction *action, toolbar->actions()) {
          toolbar->widgetForAction(action)->setFixedWidth(w);
      }
  }
  
  void BitcoinGUI::setClientModel(ClientModel *clientModel)
  {
      this->clientModel = clientModel;
      if(clientModel)
      {
          // Replace some strings and icons, when using the testnet
          if(clientModel->isTestNet())
          {
              setWindowTitle(windowTitle() + QString(" ") + tr("[testnet]"));
  #ifndef Q_OS_MAC
              qApp->setWindowIcon(QIcon(":icons/bitcoin_testnet"));
              setWindowIcon(QIcon(":icons/bitcoin_testnet"));
  #else
              MacDockIconHandler::instance()->setIcon(QIcon(":icons/bitcoin_testnet"));
  #endif
              if(trayIcon)
              {
                  trayIcon->setToolTip(tr("Zong client") + QString(" ") + tr("[testnet]"));
                  trayIcon->setIcon(QIcon(":/icons/toolbar_testnet"));
                  toggleHideAction->setIcon(QIcon(":/icons/toolbar_testnet"));
              }
          }
  
          // Keep up to date with client
          setNumConnections(clientModel->getNumConnections());
          connect(clientModel, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
  
          setNumBlocks(clientModel->getNumBlocks());
          connect(clientModel, SIGNAL(numBlocksChanged(int)), this, SLOT(setNumBlocks(int)));
  
          // Receive and report messages from network/worker thread
          connect(clientModel, SIGNAL(message(QString,QString,bool,unsigned int)), this, SLOT(message(QString,QString,bool,unsigned int)));
  
          overviewPage->setClientModel(clientModel);
          rpcConsole->setClientModel(clientModel);
          addressBookPage->setOptionsModel(clientModel->getOptionsModel());
          receiveCoinsPage->setOptionsModel(clientModel->getOptionsModel());
      }
  }
  
  void BitcoinGUI::setWalletModel(WalletModel *walletModel)
  {
      this->walletModel = walletModel;
      if(walletModel)
      {
          // Receive and report messages from wallet thread
          connect(walletModel, SIGNAL(message(QString,QString,bool,unsigned int)), this, SLOT(message(QString,QString,bool,unsigned int)));
  
          // Put transaction list in tabs
          transactionView->setModel(walletModel);
          overviewPage->setWalletModel(walletModel);
          addressBookPage->setModel(walletModel->getAddressTableModel());
          receiveCoinsPage->setModel(walletModel->getAddressTableModel());
          sendCoinsPage->setModel(walletModel);
          signVerifyMessageDialog->setModel(walletModel);
  
          setEncryptionStatus(walletModel->getEncryptionStatus());
          connect(walletModel, SIGNAL(encryptionStatusChanged(int)), this, SLOT(setEncryptionStatus(int)));
  
          // Balloon pop-up for new transaction
          connect(walletModel->getTransactionTableModel(), SIGNAL(rowsInserted(QModelIndex,int,int)),
                  this, SLOT(incomingTransaction(QModelIndex,int,int)));
  
          // Ask for passphrase if needed
          connect(walletModel, SIGNAL(requireUnlock()), this, SLOT(unlockWallet()));
      }
  }
  
  void BitcoinGUI::createTrayIcon()
  {
      QMenu *trayIconMenu;
  #ifndef Q_OS_MAC
      trayIcon = new QSystemTrayIcon(this);
      trayIconMenu = new QMenu(this);
      trayIcon->setContextMenu(trayIconMenu);
      trayIcon->setToolTip(tr("Zong client"));
      trayIcon->setIcon(QIcon(":/icons/toolbar"));
      connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
              this, SLOT(trayIconActivated(QSystemTrayIcon::ActivationReason)));
      trayIcon->show();
  #else
      // Note: On Mac, the dock icon is used to provide the tray's functionality.
      MacDockIconHandler *dockIconHandler = MacDockIconHandler::instance();
      dockIconHandler->setMainWindow((QMainWindow *)this);
      trayIconMenu = dockIconHandler->dockMenu();
  #endif
  
      // Configuration of the tray icon (or dock icon) icon menu
      trayIconMenu->addAction(toggleHideAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(receiveCoinsAction);
      trayIconMenu->addAction(sendCoinsAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(signMessageAction);
      trayIconMenu->addAction(verifyMessageAction);
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(optionsAction);
      trayIconMenu->addAction(openRPCConsoleAction);
  #ifndef Q_OS_MAC // This is built-in on Mac
      trayIconMenu->addSeparator();
      trayIconMenu->addAction(quitAction);
  #endif
  
      notificator = new Notificator(qApp->applicationName(), trayIcon);
  }
  
  #ifndef Q_OS_MAC
  void BitcoinGUI::trayIconActivated(QSystemTrayIcon::ActivationReason reason)
  {
      if(reason == QSystemTrayIcon::Trigger)
      {
          // Click on system tray icon triggers show/hide of the main window
          toggleHideAction->trigger();
      }
  }
  #endif
  
  void BitcoinGUI::optionsClicked()
  {
      if(!clientModel || !clientModel->getOptionsModel())
          return;
      OptionsDialog dlg;
      dlg.setModel(clientModel->getOptionsModel());
      dlg.exec();
  }
  
  void BitcoinGUI::aboutClicked()
  {
      AboutDialog dlg;
      dlg.setModel(clientModel);
      dlg.exec();
  }
  
  void BitcoinGUI::setNumConnections(int count)
  {
      QString icon;
      switch(count)
      {
      case 0: icon = ":/icons/connect_0"; break;
      case 1: case 2: case 3: icon = ":/icons/connect_1"; break;
      case 4: case 5: case 6: icon = ":/icons/connect_2"; break;
      case 7: case 8: case 9: icon = ":/icons/connect_3"; break;
      default: icon = ":/icons/connect_4"; break;
      }
      labelConnectionsIcon->setPixmap(QIcon(icon).pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
      labelConnectionsIcon->setToolTip(tr("%n active connection(s) to Zong network", "", count));
  }
  
  void BitcoinGUI::setNumBlocks(int count)
  {
      // don't show / hide progress bar and its label if we have no connection to the network
      if (!clientModel || (clientModel->getNumConnections() == 0 && !clientModel->isImporting()))
      {
          statusBar()->setVisible(false);
  
          return;
      }
  
      bool fShowStatusBar = false;
      QString tooltip;
  
      QDateTime lastBlockDate = clientModel->getLastBlockDate();
      QDateTime currentDate = QDateTime::currentDateTime();
      int totalSecs = GetTime() - Params().GenesisBlock().GetBlockTime();
      int secs = lastBlockDate.secsTo(currentDate);
  
      tooltip = tr("Processed %1 blocks of transaction history.").arg(count);
  
      // Set icon state: spinning if catching up, tick otherwise
      if(secs < 90*60)
      {
          tooltip = tr("Up to date") + QString(".<br>") + tooltip;
          labelBlocksIcon->setPixmap(QIcon(":/icons/synced").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
  
          overviewPage->showOutOfSyncWarning(false);
  
          progressBarLabel->setVisible(false);
          progressBar->setVisible(false);
      }
      else
      {
          // Represent time from last generated block in human readable text
          QString timeBehindText;
          const int HOUR_IN_SECONDS = 60*60;
          const int DAY_IN_SECONDS = 24*60*60;
          const int WEEK_IN_SECONDS = 7*24*60*60;
          const int YEAR_IN_SECONDS = 31556952; // Average length of year in Gregorian calendar
          if(secs < 2*DAY_IN_SECONDS)
          {
              timeBehindText = tr("%n hour(s)","",secs/HOUR_IN_SECONDS);
          }
          else if(secs < 2*WEEK_IN_SECONDS)
          {
              timeBehindText = tr("%n day(s)","",secs/DAY_IN_SECONDS);
          }
          else if(secs < YEAR_IN_SECONDS)
          {
              timeBehindText = tr("%n week(s)","",secs/WEEK_IN_SECONDS);
          }
          else
          {
              int years = secs / YEAR_IN_SECONDS;
              int remainder = secs % YEAR_IN_SECONDS;
              timeBehindText = tr("%1 and %2").arg(tr("%n year(s)", "", years)).arg(tr("%n week(s)","", remainder/WEEK_IN_SECONDS));
          }
  
          progressBarLabel->setText(tr(clientModel->isImporting() ? "Importing blocks..." : "Synchronizing with network..."));
          progressBarLabel->setVisible(true);
          progressBar->setFormat(tr("%1 behind").arg(timeBehindText));
          progressBar->setMaximum(totalSecs);
          progressBar->setValue(totalSecs - secs);
          progressBar->setVisible(true);
          fShowStatusBar = true;
  
          tooltip = tr("Catching up...") + QString("<br>") + tooltip;
          labelBlocksIcon->setMovie(syncIconMovie);
          if(count != prevBlocks)
              syncIconMovie->jumpToNextFrame();
          prevBlocks = count;
  
          overviewPage->showOutOfSyncWarning(true);
  
          tooltip += QString("<br>");
          tooltip += tr("Last received block was generated %1 ago.").arg(timeBehindText);
          tooltip += QString("<br>");
          tooltip += tr("Transactions after this will not yet be visible.");
      }
  
      // Don't word-wrap this (fixed-width) tooltip
      tooltip = QString("<nobr>") + tooltip + QString("</nobr>");
  
      labelBlocksIcon->setToolTip(tooltip);
      progressBarLabel->setToolTip(tooltip);
      progressBar->setToolTip(tooltip);
  
      statusBar()->setVisible(fShowStatusBar);
  }
  
  void BitcoinGUI::message(const QString &title, const QString &message, bool modal, unsigned int style)
  {
      QString strTitle = tr("Zong") + " - ";
      // Default to information icon
      int nMBoxIcon = QMessageBox::Information;
      int nNotifyIcon = Notificator::Information;
  
      // Check for usage of predefined title
      switch (style) {
      case CClientUIInterface::MSG_ERROR:
          strTitle += tr("Error");
          break;
      case CClientUIInterface::MSG_WARNING:
          strTitle += tr("Warning");
          break;
      case CClientUIInterface::MSG_INFORMATION:
          strTitle += tr("Information");
          break;
      default:
          strTitle += title; // Use supplied title
      }
  
      // Check for error/warning icon
      if (style & CClientUIInterface::ICON_ERROR) {
          nMBoxIcon = QMessageBox::Critical;
          nNotifyIcon = Notificator::Critical;
      }
      else if (style & CClientUIInterface::ICON_WARNING) {
          nMBoxIcon = QMessageBox::Warning;
          nNotifyIcon = Notificator::Warning;
      }
  
      // Display message
      if (modal) {
          // Check for buttons, use OK as default, if none was supplied
          QMessageBox::StandardButton buttons;
          if (!(buttons = (QMessageBox::StandardButton)(style & CClientUIInterface::BTN_MASK)))
              buttons = QMessageBox::Ok;
  
          QMessageBox mBox((QMessageBox::Icon)nMBoxIcon, strTitle, message, buttons);
          mBox.exec();
      }
      else
          notificator->notify((Notificator::Class)nNotifyIcon, strTitle, message);
  }
  
  void BitcoinGUI::changeEvent(QEvent *e)
  {
      QMainWindow::changeEvent(e);
  #ifndef Q_OS_MAC // Ignored on Mac
      if(e->type() == QEvent::WindowStateChange)
      {
          if(clientModel && clientModel->getOptionsModel()->getMinimizeToTray())
          {
              QWindowStateChangeEvent *wsevt = static_cast<QWindowStateChangeEvent*>(e);
              if(!(wsevt->oldState() & Qt::WindowMinimized) && isMinimized())
              {
                  QTimer::singleShot(0, this, SLOT(hide()));
                  e->ignore();
              }
          }
      }
  #endif
  }
  
  void BitcoinGUI::closeEvent(QCloseEvent *event)
  {
      if(clientModel)
      {
  #ifndef Q_OS_MAC // Ignored on Mac
          if(!clientModel->getOptionsModel()->getMinimizeToTray() &&
             !clientModel->getOptionsModel()->getMinimizeOnClose())
          {
              qApp->quit();
          }
  #endif
      }
      QMainWindow::closeEvent(event);
  }
  
  void BitcoinGUI::askFee(qint64 nFeeRequired, bool *payFee)
  {
      if (!clientModel || !clientModel->getOptionsModel())
          return;
  
      QString strMessage = tr("This transaction is over the size limit. You can still send it for a fee of %1, "
          "which goes to the nodes that process your transaction and helps to support the network. "
          "Do you want to pay the fee?").arg(BitcoinUnits::formatWithUnit(clientModel->getOptionsModel()->getDisplayUnit(), nFeeRequired));
      QMessageBox::StandardButton retval = QMessageBox::question(
            this, tr("Confirm transaction fee"), strMessage,
            QMessageBox::Yes|QMessageBox::Cancel, QMessageBox::Yes);
      *payFee = (retval == QMessageBox::Yes);
  }
  
  void BitcoinGUI::incomingTransaction(const QModelIndex & parent, int start, int end)
  {
      if(!walletModel || !clientModel)
          return;
      TransactionTableModel *ttm = walletModel->getTransactionTableModel();
      qint64 amount = ttm->index(start, TransactionTableModel::Amount, parent)
                      .data(Qt::EditRole).toULongLong();
      if(!clientModel->inInitialBlockDownload())
      {
          // On new transaction, make an info balloon
          // Unless the initial block download is in progress, to prevent balloon-spam
          QString date = ttm->index(start, TransactionTableModel::Date, parent)
                          .data().toString();
          QString type = ttm->index(start, TransactionTableModel::Type, parent)
                          .data().toString();
          QString address = ttm->index(start, TransactionTableModel::ToAddress, parent)
                          .data().toString();
          QIcon icon = qvariant_cast<QIcon>(ttm->index(start,
                              TransactionTableModel::ToAddress, parent)
                          .data(Qt::DecorationRole));
  
          notificator->notify(Notificator::Information,
                              (amount)<0 ? tr("Sent transaction") :
                                           tr("Incoming transaction"),
                                tr("Date: %1\n"
                                   "Amount: %2\n"
                                   "Type: %3\n"
                                   "Address: %4\n")
                                .arg(date)
                                .arg(BitcoinUnits::formatWithUnit(walletModel->getOptionsModel()->getDisplayUnit(), amount, true))
                                .arg(type)
                                .arg(address), icon);
      }
  }
  
  void BitcoinGUI::gotoOverviewPage()
  {
      overviewAction->setChecked(true);
      centralStackedWidget->setCurrentWidget(overviewPage);
  
      exportAction->setEnabled(false);
      disconnect(exportAction, SIGNAL(triggered()), 0, 0);
  }
  
  void BitcoinGUI::gotoHistoryPage()
  {
      historyAction->setChecked(true);
      centralStackedWidget->setCurrentWidget(transactionsPage);
  
      exportAction->setEnabled(true);
      disconnect(exportAction, SIGNAL(triggered()), 0, 0);
      connect(exportAction, SIGNAL(triggered()), transactionView, SLOT(exportClicked()));
  }
  
  void BitcoinGUI::gotoAddressBookPage()
  {
      addressBookAction->setChecked(true);
      centralStackedWidget->setCurrentWidget(addressBookPage);
  
      exportAction->setEnabled(true);
      disconnect(exportAction, SIGNAL(triggered()), 0, 0);
      connect(exportAction, SIGNAL(triggered()), addressBookPage, SLOT(exportClicked()));
  }
  
  void BitcoinGUI::gotoReceiveCoinsPage()
  {
      receiveCoinsAction->setChecked(true);
      centralStackedWidget->setCurrentWidget(receiveCoinsPage);
  
      exportAction->setEnabled(true);
      disconnect(exportAction, SIGNAL(triggered()), 0, 0);
      connect(exportAction, SIGNAL(triggered()), receiveCoinsPage, SLOT(exportClicked()));
  }
  
  void BitcoinGUI::gotoSendCoinsPage()
  {
      sendCoinsAction->setChecked(true);
      centralStackedWidget->setCurrentWidget(sendCoinsPage);
  
      exportAction->setEnabled(false);
      disconnect(exportAction, SIGNAL(triggered()), 0, 0);
  }
  
  void BitcoinGUI::gotoSignMessageTab(QString addr)
  {
      // call show() in showTab_SM()
      signVerifyMessageDialog->showTab_SM(true);
  
      if(!addr.isEmpty())
          signVerifyMessageDialog->setAddress_SM(addr);
  }
  
  void BitcoinGUI::gotoVerifyMessageTab(QString addr)
  {
      // call show() in showTab_VM()
      signVerifyMessageDialog->showTab_VM(true);
  
      if(!addr.isEmpty())
          signVerifyMessageDialog->setAddress_VM(addr);
  }
  
  void BitcoinGUI::dragEnterEvent(QDragEnterEvent *event)
  {
      // Accept only URIs
      if(event->mimeData()->hasUrls())
          event->acceptProposedAction();
  }
  
  void BitcoinGUI::dropEvent(QDropEvent *event)
  {
      if(event->mimeData()->hasUrls())
      {
          int nValidUrisFound = 0;
          QList<QUrl> uris = event->mimeData()->urls();
          foreach(const QUrl &uri, uris)
          {
              if (sendCoinsPage->handleURI(uri.toString()))
                  nValidUrisFound++;
          }
  
          // if valid URIs were found
          if (nValidUrisFound)
              gotoSendCoinsPage();
          else
              notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Zong address or malformed URI parameters."));
      }
  
      event->acceptProposedAction();
  }
  
  void BitcoinGUI::handleURI(QString strURI)
  {
      // URI has to be valid
      if (sendCoinsPage->handleURI(strURI))
      {
          showNormalIfMinimized();
          gotoSendCoinsPage();
      }
      else
          notificator->notify(Notificator::Warning, tr("URI handling"), tr("URI can not be parsed! This can be caused by an invalid Zong address or malformed URI parameters."));
  }
  
  void BitcoinGUI::setEncryptionStatus(int status)
  {
      switch(status)
      {
      case WalletModel::Unencrypted:
          labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_open").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelEncryptionIcon->setToolTip(tr("Wallet is <b>not encrypted</b>"));
          changePassphraseAction->setEnabled(false);
          unlockWalletAction->setVisible(false);
          lockWalletAction->setVisible(false);
          encryptWalletAction->setEnabled(true);
          break;
      case WalletModel::Unlocked:
          labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_open").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>unlocked</b>"));
          changePassphraseAction->setEnabled(true);
          unlockWalletAction->setVisible(false);
          lockWalletAction->setVisible(true);
          encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
          break;
      case WalletModel::Locked:
          labelEncryptionIcon->setPixmap(QIcon(":/icons/lock_closed").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelEncryptionIcon->setToolTip(tr("Wallet is <b>encrypted</b> and currently <b>locked</b>"));
          changePassphraseAction->setEnabled(true);
          unlockWalletAction->setVisible(true);
          lockWalletAction->setVisible(false);
          encryptWalletAction->setEnabled(false); // TODO: decrypt currently not supported
          break;
      }
  }
  
  void BitcoinGUI::encryptWallet()
  {
      if(!walletModel)
          return;
  
      AskPassphraseDialog dlg(AskPassphraseDialog::Encrypt, this);
      dlg.setModel(walletModel);
      dlg.exec();
  
      setEncryptionStatus(walletModel->getEncryptionStatus());
  }
  
  void BitcoinGUI::backupWallet()
  {
      QString saveDir = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
      QString filename = QFileDialog::getSaveFileName(this, tr("Backup Wallet"), saveDir, tr("Wallet Data (*.dat)"));
      if(!filename.isEmpty()) {
          if(!walletModel->backupWallet(filename)) {
              QMessageBox::warning(this, tr("Backup Failed"), tr("There was an error trying to save the wallet data to the new location."));
          }
      }
  }
  
  void BitcoinGUI::changePassphrase()
  {
      AskPassphraseDialog dlg(AskPassphraseDialog::ChangePass, this);
      dlg.setModel(walletModel);
      dlg.exec();
  }
  
  void BitcoinGUI::unlockWallet()
  {
      if(!walletModel)
          return;
      // Unlock wallet when requested by wallet model
      if(walletModel->getEncryptionStatus() == WalletModel::Locked)
      {
          AskPassphraseDialog::Mode mode = sender() == unlockWalletAction ?
                AskPassphraseDialog::UnlockStaking : AskPassphraseDialog::Unlock;
          AskPassphraseDialog dlg(mode, this);
          dlg.setModel(walletModel);
          dlg.exec();
      }
  }
  
  void BitcoinGUI::lockWallet()
  {
      if(!walletModel)
          return;
  
      walletModel->setWalletLocked(true);
  }
  
  void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)
  {
      // activateWindow() (sometimes) helps with keyboard focus on Windows
      if (isHidden())
      {
          show();
          activateWindow();
      }
      else if (isMinimized())
      {
          showNormal();
          activateWindow();
      }
      else if (GUIUtil::isObscured(this))
      {
          raise();
          activateWindow();
      }
      else if(fToggleHidden)
          hide();
  }
  
  void BitcoinGUI::toggleHidden()
  {
      showNormalIfMinimized(true);
  }
  
  void BitcoinGUI::updateWeight()
  {
      if (!pwalletMain)
          return;
  
      TRY_LOCK(cs_main, lockMain);
      if (!lockMain)
          return;
  
      TRY_LOCK(pwalletMain->cs_wallet, lockWallet);
      if (!lockWallet)
          return;
  
      pwalletMain->GetStakeWeight(nMinWeight, nMaxWeight, nWeight);
  }
  
  void BitcoinGUI::updateStakingIcon()
  {
      updateWeight();
  
      if (nLastCoinStakeSearchInterval && nWeight)
      {
          uint64_t nWeight = this->nWeight;
          uint64_t nNetworkWeight = GetPoSKernelPS();
  
          nWeight /= COIN;
          nNetworkWeight /= COIN;
  
          labelStakingIcon->setPixmap(QIcon(":/icons/staking_on").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          labelStakingIcon->setToolTip(tr("Staking.<br>Your weight is %1<br>Network weight is %2").arg(nWeight).arg(nNetworkWeight));
      }
      else
      {
          labelStakingIcon->setPixmap(QIcon(":/icons/staking_off").pixmap(STATUSBAR_ICONSIZE,STATUSBAR_ICONSIZE));
          if (pwalletMain && pwalletMain->IsLocked())
              labelStakingIcon->setToolTip(tr("Not staking because wallet is locked"));
          else if (vNodes.empty())
              labelStakingIcon->setToolTip(tr("Not staking because wallet is offline"));
          else if (IsInitialBlockDownload())
              labelStakingIcon->setToolTip(tr("Not staking because wallet is syncing"));
          else if (!nWeight)
              labelStakingIcon->setToolTip(tr("Not staking because you don't have mature coins"));
          else
              labelStakingIcon->setToolTip(tr("Not staking"));
      }
  }
  
  void BitcoinGUI::detectShutdown()
  {
      if (ShutdownRequested())
          QMetaObject::invokeMethod(QCoreApplication::instance(), "quit", Qt::QueuedConnection);
  }
  