text: // Copyright (c) 2011-2020 The Bitcoin Core and Devcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #if defined(HAVE_CONFIG_H)
  #include <config/devcoin-config.h>
  #endif
  
  #include <qt/addressbookpage.h>
  #include <qt/forms/ui_addressbookpage.h>
  
  #include <qt/addresstablemodel.h>
  #include <qt/csvmodelwriter.h>
  #include <qt/editaddressdialog.h>
  #include <qt/guiutil.h>
  #include <qt/platformstyle.h>
  
  #include <QIcon>
  #include <QMenu>
  #include <QMessageBox>
  #include <QSortFilterProxyModel>
  
  class AddressBookSortFilterProxyModel final : public QSortFilterProxyModel
  {
      const QString m_type;
  
  public:
      AddressBookSortFilterProxyModel(const QString& type, QObject* parent)
          : QSortFilterProxyModel(parent)
          , m_type(type)
      {
          setDynamicSortFilter(true);
          setFilterCaseSensitivity(Qt::CaseInsensitive);
          setSortCaseSensitivity(Qt::CaseInsensitive);
      }
  
  protected:
      bool filterAcceptsRow(int row, const QModelIndex& parent) const override
      {
          auto model = sourceModel();
          auto label = model->index(row, AddressTableModel::Label, parent);
  
          if (model->data(label, AddressTableModel::TypeRole).toString() != m_type) {
              return false;
          }
  
          auto address = model->index(row, AddressTableModel::Address, parent);
  
          if (filterRegExp().indexIn(model->data(address).toString()) < 0 &&
              filterRegExp().indexIn(model->data(label).toString()) < 0) {
              return false;
          }
  
          return true;
      }
  };
  
  AddressBookPage::AddressBookPage(const PlatformStyle *platformStyle, Mode _mode, Tabs _tab, QWidget *parent) :
      QDialog(parent, GUIUtil::dialog_flags),
      ui(new Ui::AddressBookPage),
      model(nullptr),
      mode(_mode),
      tab(_tab)
  {
      ui->setupUi(this);
  
      if (!platformStyle->getImagesOnButtons()) {
          ui->newAddress->setIcon(QIcon());
          ui->copyAddress->setIcon(QIcon());
          ui->deleteAddress->setIcon(QIcon());
          ui->exportButton->setIcon(QIcon());
      } else {
          ui->newAddress->setIcon(platformStyle->SingleColorIcon(":/icons/add"));
          ui->copyAddress->setIcon(platformStyle->SingleColorIcon(":/icons/editcopy"));
          ui->deleteAddress->setIcon(platformStyle->SingleColorIcon(":/icons/remove"));
          ui->exportButton->setIcon(platformStyle->SingleColorIcon(":/icons/export"));
      }
  
      switch(mode)
      {
      case ForSelection:
          switch(tab)
          {
          case SendingTab: setWindowTitle(tr("Choose the address to send coins to")); break;
          case ReceivingTab: setWindowTitle(tr("Choose the address to receive coins with")); break;
          }
          connect(ui->tableView, &QTableView::doubleClicked, this, &QDialog::accept);
          ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
          ui->tableView->setFocus();
          ui->closeButton->setText(tr("C&hoose"));
          ui->exportButton->hide();
          break;
      case ForEditing:
          switch(tab)
          {
          case SendingTab: setWindowTitle(tr("Sending addresses")); break;
          case ReceivingTab: setWindowTitle(tr("Receiving addresses")); break;
          }
          break;
      }
      switch(tab)
      {
      case SendingTab:
          ui->labelExplanation->setText(tr("These are your Devcoin addresses for sending payments. Always check the amount and the receiving address before sending coins."));
          ui->deleteAddress->setVisible(true);
          ui->newAddress->setVisible(true);
          break;
      case ReceivingTab:
          ui->labelExplanation->setText(tr("These are your Devcoin addresses for receiving payments. Use the 'Create new receiving address' button in the receive tab to create new addresses.\nSigning is only possible with addresses of the type 'legacy'."));
          ui->deleteAddress->setVisible(false);
          ui->newAddress->setVisible(false);
          break;
      }
  
      // Build context menu
      contextMenu = new QMenu(this);
      contextMenu->addAction(tr("&Copy Address"), this, &AddressBookPage::on_copyAddress_clicked);
      contextMenu->addAction(tr("Copy &Label"), this, &AddressBookPage::onCopyLabelAction);
      contextMenu->addAction(tr("&Edit"), this, &AddressBookPage::onEditAction);
  
      if (tab == SendingTab) {
          contextMenu->addAction(tr("&Delete"), this, &AddressBookPage::on_deleteAddress_clicked);
      }
  
      connect(ui->tableView, &QWidget::customContextMenuRequested, this, &AddressBookPage::contextualMenu);
      connect(ui->closeButton, &QPushButton::clicked, this, &QDialog::accept);
  
      GUIUtil::handleCloseWindowShortcut(this);
  }
  
  AddressBookPage::~AddressBookPage()
  {
      delete ui;
  }
  
  void AddressBookPage::setModel(AddressTableModel *_model)
  {
      this->model = _model;
      if(!_model)
          return;
  
      auto type = tab == ReceivingTab ? AddressTableModel::Receive : AddressTableModel::Send;
      proxyModel = new AddressBookSortFilterProxyModel(type, this);
      proxyModel->setSourceModel(_model);
  
      connect(ui->searchLineEdit, &QLineEdit::textChanged, proxyModel, &QSortFilterProxyModel::setFilterWildcard);
  
      ui->tableView->setModel(proxyModel);
      ui->tableView->sortByColumn(0, Qt::AscendingOrder);
  
      // Set column widths
      ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Label, QHeaderView::Stretch);
      ui->tableView->horizontalHeader()->setSectionResizeMode(AddressTableModel::Address, QHeaderView::ResizeToContents);
  
      connect(ui->tableView->selectionModel(), &QItemSelectionModel::selectionChanged,
          this, &AddressBookPage::selectionChanged);
  
      // Select row for newly created address
      connect(_model, &AddressTableModel::rowsInserted, this, &AddressBookPage::selectNewAddress);
  
      selectionChanged();
  }
  
  void AddressBookPage::on_copyAddress_clicked()
  {
      GUIUtil::copyEntryData(ui->tableView, AddressTableModel::Address);
  }
  
  void AddressBookPage::onCopyLabelAction()
  {
      GUIUtil::copyEntryData(ui->tableView, AddressTableModel::Label);
  }
  
  void AddressBookPage::onEditAction()
  {
      if(!model)
          return;
  
      if(!ui->tableView->selectionModel())
          return;
      QModelIndexList indexes = ui->tableView->selectionModel()->selectedRows();
      if(indexes.isEmpty())
          return;
  
      EditAddressDialog dlg(
          tab == SendingTab ?
          EditAddressDialog::EditSendingAddress :
          EditAddressDialog::EditReceivingAddress, this);
      dlg.setModel(model);
      QModelIndex origIndex = proxyModel->mapToSource(indexes.at(0));
      dlg.loadRow(origIndex.row());
      dlg.exec();
  }
  
  void AddressBookPage::on_newAddress_clicked()
  {
      if(!model)
          return;
  
      if (tab == ReceivingTab) {
          return;
      }
  
      EditAddressDialog dlg(EditAddressDialog::NewSendingAddress, this);
      dlg.setModel(model);
      if(dlg.exec())
      {
          newAddressToSelect = dlg.getAddress();
      }
  }
  
  void AddressBookPage::on_deleteAddress_clicked()
  {
      QTableView *table = ui->tableView;
      if(!table->selectionModel())
          return;
  
      QModelIndexList indexes = table->selectionModel()->selectedRows();
      if(!indexes.isEmpty())
      {
          table->model()->removeRow(indexes.at(0).row());
      }
  }
  
  void AddressBookPage::selectionChanged()
  {
      // Set button states based on selected tab and selection
      QTableView *table = ui->tableView;
      if(!table->selectionModel())
          return;
  
      if(table->selectionModel()->hasSelection())
      {
          switch(tab)
          {
          case SendingTab:
              // In sending tab, allow deletion of selection
              ui->deleteAddress->setEnabled(true);
              ui->deleteAddress->setVisible(true);
              break;
          case ReceivingTab:
              // Deleting receiving addresses, however, is not allowed
              ui->deleteAddress->setEnabled(false);
              ui->deleteAddress->setVisible(false);
              break;
          }
          ui->copyAddress->setEnabled(true);
      }
      else
      {
          ui->deleteAddress->setEnabled(false);
          ui->copyAddress->setEnabled(false);
      }
  }
  
  void AddressBookPage::done(int retval)
  {
      QTableView *table = ui->tableView;
      if(!table->selectionModel() || !table->model())
          return;
  
      // Figure out which address was selected, and return it
      QModelIndexList indexes = table->selectionModel()->selectedRows(AddressTableModel::Address);
  
      for (const QModelIndex& index : indexes) {
          QVariant address = table->model()->data(index);
          returnValue = address.toString();
      }
  
      if(returnValue.isEmpty())
      {
          // If no address entry selected, return rejected
          retval = Rejected;
      }
  
      QDialog::done(retval);
  }
  
  void AddressBookPage::on_exportButton_clicked()
  {
      // CSV is currently the only supported format
      QString filename = GUIUtil::getSaveFileName(this,
          tr("Export Address List"), QString(),
          /*: Expanded name of the CSV file format.
              See https://en.wikipedia.org/wiki/Comma-separated_values */
          tr("Comma separated file") + QLatin1String(" (*.csv)"), nullptr);
  
      if (filename.isNull())
          return;
  
      CSVModelWriter writer(filename);
  
      // name, column, role
      writer.setModel(proxyModel);
      writer.addColumn("Label", AddressTableModel::Label, Qt::EditRole);
      writer.addColumn("Address", AddressTableModel::Address, Qt::EditRole);
  
      if(!writer.write()) {
          QMessageBox::critical(this, tr("Exporting Failed"),
              /*: An error message. %1 is a stand-in argument for the name
                  of the file we attempted to save to. */
              tr("There was an error trying to save the address list to %1. Please try again.").arg(filename));
      }
  }
  
  void AddressBookPage::contextualMenu(const QPoint &point)
  {
      QModelIndex index = ui->tableView->indexAt(point);
      if(index.isValid())
      {
          contextMenu->exec(QCursor::pos());
      }
  }
  
  void AddressBookPage::selectNewAddress(const QModelIndex &parent, int begin, int /*end*/)
  {
      QModelIndex idx = proxyModel->mapFromSource(model->index(begin, AddressTableModel::Address, parent));
      if(idx.isValid() && (idx.data(Qt::EditRole).toString() == newAddressToSelect))
      {
          // Select row of newly created address, once
          ui->tableView->setFocus();
          ui->tableView->selectRow(idx.row());
          newAddressToSelect.clear();
      }
  }
  