/*
 * This file Copyright (C) 2009-2015 Mnemosyne LLC
 *
 * It may be used under the GNU GPL versions 2 or 3
 * or any future license endorsed by Mnemosyne LLC.
 *
 * $Id$
 */

#include <cassert>
#include <climits> /* INT_MAX */
#include <iostream>

#include <QCheckBox>
#include <QComboBox>
#include <QCoreApplication>
#include <QDialogButtonBox>
#include <QDoubleSpinBox>
#include <QFileIconProvider>
#include <QFileInfo>
#include <QHBoxLayout>
#include <QIcon>
#include <QLabel>
#include <QLineEdit>
#include <QList>
#include <QMessageBox>
#include <QPushButton>
#include <QSpinBox>
#include <QStyle>
#include <QTabWidget>
#include <QTime>
#include <QTimeEdit>
#include <QTimer>
#include <QVBoxLayout>

#include "ColumnResizer.h"
#include "FreeSpaceLabel.h"
#include "Formatter.h"
#include "Prefs.h"
#include "PrefsDialog.h"
#include "Session.h"
#include "Utils.h"

/***
****
***/

namespace
{
  const char * PREF_KEY ("pref-key");

  void
  setPrefKey (QObject * object, int key)
  {
    object->setProperty (PREF_KEY, key);
  }

  int
  getPrefKey (const QObject * object)
  {
    return object->property (PREF_KEY).toInt ();
  }

  int
  qtDayToTrDay (int day)
  {
    switch (day)
    {
      case Qt::Monday:
        return TR_SCHED_MON;
      case Qt::Tuesday:
        return TR_SCHED_TUES;
      case Qt::Wednesday:
        return TR_SCHED_WED;
      case Qt::Thursday:
        return TR_SCHED_THURS;
      case Qt::Friday:
        return TR_SCHED_FRI;
      case Qt::Saturday:
        return TR_SCHED_SAT;
      case Qt::Sunday:
        return TR_SCHED_SUN;
      default:
        assert (0 && "Invalid day of week");
        return 0;
    }
  }

  QString
  qtDayName (int day)
  {
    switch (day)
    {
      case Qt::Monday:
        return PrefsDialog::tr ("Monday");
      case Qt::Tuesday:
        return PrefsDialog::tr ("Tuesday");
      case Qt::Wednesday:
        return PrefsDialog::tr ("Wednesday");
      case Qt::Thursday:
        return PrefsDialog::tr ("Thursday");
      case Qt::Friday:
        return PrefsDialog::tr ("Friday");
      case Qt::Saturday:
        return PrefsDialog::tr ("Saturday");
      case Qt::Sunday:
        return PrefsDialog::tr ("Sunday");
      default:
        assert (0 && "Invalid day of week");
        return QString ();
    }
  }
};

bool
PrefsDialog::updateWidgetValue (QWidget * widget, int prefKey)
{
  if (auto w = qobject_cast<QCheckBox*> (widget))
    w->setChecked (myPrefs.getBool (prefKey));
  else if (auto w = qobject_cast<QSpinBox*> (widget))
    w->setValue (myPrefs.getInt (prefKey));
  else if (auto w = qobject_cast<QDoubleSpinBox*> (widget))
    w->setValue (myPrefs.getDouble (prefKey));
  else if (auto w = qobject_cast<QTimeEdit*> (widget))
    w->setTime (QTime (0, 0).addSecs (myPrefs.getInt(prefKey) * 60));
  else if (auto w = qobject_cast<QLineEdit*> (widget))
    w->setText (myPrefs.getString (prefKey));
  else if (auto w = qobject_cast<PathButton*> (widget))
    w->setPath (myPrefs.getString (prefKey));
  else
    return false;

  return true;
}

void
PrefsDialog::linkWidgetToPref (QWidget * widget, int prefKey)
{
  setPrefKey (widget, prefKey);
  updateWidgetValue (widget, prefKey);
  myWidgets.insert (prefKey, widget);

  if (widget->inherits ("QCheckBox"))
    connect (widget, SIGNAL (toggled (bool)), SLOT (checkBoxToggled (bool)));
  else if (widget->inherits ("QTimeEdit"))
    connect (widget, SIGNAL (editingFinished ()), SLOT (timeEditingFinished ()));
  else if (widget->inherits ("QLineEdit"))
    connect (widget, SIGNAL (editingFinished ()), SLOT (lineEditingFinished ()));
  else if (widget->inherits ("PathButton"))
    connect (widget, SIGNAL (pathChanged (QString)), SLOT (pathChanged (QString)));
  else if (widget->inherits ("QAbstractSpinBox"))
    connect (widget, SIGNAL (editingFinished ()), SLOT (spinBoxEditingFinished ()));
}

void
PrefsDialog::checkBoxToggled (bool checked)
{
  if (auto c = qobject_cast<QCheckBox*> (sender ()))
    setPref (getPrefKey (c), checked);
}

void
PrefsDialog::spinBoxEditingFinished ()
{
  const QObject * spin = sender();
  const int key = getPrefKey (spin);

  if (auto e = qobject_cast<const QDoubleSpinBox*> (spin))
    setPref (key, e->value ());
  else if (auto e = qobject_cast<const QSpinBox*> (spin))
    setPref (key, e->value ());
}

void
PrefsDialog::timeEditingFinished ()
{
  if (auto e = qobject_cast<const QTimeEdit*> (sender ()))
    setPref(getPrefKey (e), QTime (0, 0).secsTo (e->time()) / 60);
}

void
PrefsDialog::lineEditingFinished ()
{
  if (auto e = qobject_cast<const QLineEdit*> (sender ()))
    {
      if (e->isModified ())
        setPref (getPrefKey (e), e->text());
    }
}

void
PrefsDialog::pathChanged (const QString& path)
{
  if (auto b = qobject_cast<const PathButton*> (sender ()))
    setPref(getPrefKey (b), path);
}

/***
****
***/

void
PrefsDialog::initRemoteTab ()
{
  linkWidgetToPref (ui.enableRpcCheck, Prefs::RPC_ENABLED);
  linkWidgetToPref (ui.rpcPortSpin, Prefs::RPC_PORT);
  linkWidgetToPref (ui.requireRpcAuthCheck, Prefs::RPC_AUTH_REQUIRED);
  linkWidgetToPref (ui.rpcUsernameEdit, Prefs::RPC_USERNAME);
  linkWidgetToPref (ui.rpcPasswordEdit, Prefs::RPC_PASSWORD);
  linkWidgetToPref (ui.enableRpcWhitelistCheck, Prefs::RPC_WHITELIST_ENABLED);
  linkWidgetToPref (ui.rpcWhitelistEdit, Prefs::RPC_WHITELIST);

  myWebWidgets <<
    ui.rpcPortLabel <<
    ui.rpcPortSpin <<
    ui.requireRpcAuthCheck <<
    ui.enableRpcWhitelistCheck;
  myWebAuthWidgets <<
    ui.rpcUsernameLabel <<
    ui.rpcUsernameEdit <<
    ui.rpcPasswordLabel <<
    ui.rpcPasswordEdit;
  myWebWhitelistWidgets <<
    ui.rpcWhitelistLabel <<
    ui.rpcWhitelistEdit;
  myUnsupportedWhenRemote <<
    ui.enableRpcCheck <<
    myWebWidgets <<
    myWebAuthWidgets <<
    myWebWhitelistWidgets;

  connect (ui.openWebClientButton, SIGNAL (clicked ()), &mySession, SLOT (launchWebInterface ()));
}

/***
****
***/

void
PrefsDialog::altSpeedDaysEdited (int i)
{
  const int value = qobject_cast<QComboBox*>(sender())->itemData(i).toInt();
  setPref (Prefs::ALT_SPEED_LIMIT_TIME_DAY, value);
}

void
PrefsDialog::initSpeedTab ()
{
  const QString speed_K_str = Formatter::unitStr (Formatter::SPEED, Formatter::KB);
  const QLocale locale;

  ui.uploadSpeedLimitSpin->setSuffix (QString::fromLatin1 (" %1").arg (speed_K_str));
  ui.downloadSpeedLimitSpin->setSuffix (QString::fromLatin1 (" %1").arg (speed_K_str));
  ui.altUploadSpeedLimitSpin->setSuffix (QString::fromLatin1 (" %1").arg (speed_K_str));
  ui.altDownloadSpeedLimitSpin->setSuffix (QString::fromLatin1 (" %1").arg (speed_K_str));

  ui.altSpeedLimitDaysCombo->addItem (tr ("Every Day"), QVariant (TR_SCHED_ALL));
  ui.altSpeedLimitDaysCombo->addItem (tr ("Weekdays"),  QVariant (TR_SCHED_WEEKDAY));
  ui.altSpeedLimitDaysCombo->addItem (tr ("Weekends"),  QVariant (TR_SCHED_WEEKEND));
  ui.altSpeedLimitDaysCombo->insertSeparator (ui.altSpeedLimitDaysCombo->count ());
  for (int i = locale.firstDayOfWeek (); i <= Qt::Sunday; ++i)
    ui.altSpeedLimitDaysCombo->addItem (qtDayName (i), qtDayToTrDay (i));
  for (int i = Qt::Monday; i < locale.firstDayOfWeek (); ++i)
    ui.altSpeedLimitDaysCombo->addItem (qtDayName (i), qtDayToTrDay (i));
  ui.altSpeedLimitDaysCombo->setCurrentIndex (ui.altSpeedLimitDaysCombo->findData (myPrefs.getInt (Prefs::ALT_SPEED_LIMIT_TIME_DAY)));

  linkWidgetToPref (ui.uploadSpeedLimitCheck, Prefs::USPEED_ENABLED);
  linkWidgetToPref (ui.uploadSpeedLimitSpin, Prefs::USPEED);
  linkWidgetToPref (ui.downloadSpeedLimitCheck, Prefs::DSPEED_ENABLED);
  linkWidgetToPref (ui.downloadSpeedLimitSpin, Prefs::DSPEED);
  linkWidgetToPref (ui.altUploadSpeedLimitSpin, Prefs::ALT_SPEED_LIMIT_UP);
  linkWidgetToPref (ui.altDownloadSpeedLimitSpin, Prefs::ALT_SPEED_LIMIT_DOWN);
  linkWidgetToPref (ui.altSpeedLimitScheduleCheck, Prefs::ALT_SPEED_LIMIT_TIME_ENABLED);
  linkWidgetToPref (ui.altSpeedLimitStartTimeEdit, Prefs::ALT_SPEED_LIMIT_TIME_BEGIN);
  linkWidgetToPref (ui.altSpeedLimitEndTimeEdit, Prefs::ALT_SPEED_LIMIT_TIME_END);

  mySchedWidgets <<
    ui.altSpeedLimitStartTimeEdit <<
    ui.altSpeedLimitToLabel <<
    ui.altSpeedLimitEndTimeEdit <<
    ui.altSpeedLimitDaysLabel <<
    ui.altSpeedLimitDaysCombo;

  ColumnResizer * cr (new ColumnResizer (this));
  cr->addLayout (ui.speedLimitsSectionLayout);
  cr->addLayout (ui.altSpeedLimitsSectionLayout);
  cr->update ();

  connect (ui.altSpeedLimitDaysCombo, SIGNAL (activated (int)), SLOT (altSpeedDaysEdited (int)));
}

/***
****
***/

void
PrefsDialog::initDesktopTab ()
{
  linkWidgetToPref (ui.showTrayIconCheck, Prefs::SHOW_TRAY_ICON);
  linkWidgetToPref (ui.startMinimizedCheck, Prefs::START_MINIMIZED);
  linkWidgetToPref (ui.notifyOnTorrentAddedCheck, Prefs::SHOW_NOTIFICATION_ON_ADD);
  linkWidgetToPref (ui.notifyOnTorrentCompletedCheck, Prefs::SHOW_NOTIFICATION_ON_COMPLETE);
  linkWidgetToPref (ui.playSoundOnTorrentCompletedCheck, Prefs::COMPLETE_SOUND_ENABLED);
}

/***
****
***/

void
PrefsDialog::onPortTested (bool isOpen)
{
  ui.testPeerPortButton->setEnabled (true);
  myWidgets[Prefs::PEER_PORT]->setEnabled (true);
  ui.peerPortStatusLabel->setText (isOpen ? tr ("Port is <b>open</b>")
                                          : tr ("Port is <b>closed</b>"));
}

void
PrefsDialog::onPortTest ()
{
  ui.peerPortStatusLabel->setText (tr ("Testing TCP Port..."));
  ui.testPeerPortButton->setEnabled (false);
  myWidgets[Prefs::PEER_PORT]->setEnabled (false);
  mySession.portTest ();
}

void
PrefsDialog::initNetworkTab ()
{
  ui.torrentPeerLimitSpin->setRange (1, FD_SETSIZE);
  ui.globalPeerLimitSpin->setRange (1, FD_SETSIZE);

  linkWidgetToPref (ui.peerPortSpin, Prefs::PEER_PORT);
  linkWidgetToPref (ui.randomPeerPortCheck, Prefs::PEER_PORT_RANDOM_ON_START);
  linkWidgetToPref (ui.enablePortForwardingCheck, Prefs::PORT_FORWARDING);
  linkWidgetToPref (ui.torrentPeerLimitSpin, Prefs::PEER_LIMIT_TORRENT);
  linkWidgetToPref (ui.globalPeerLimitSpin, Prefs::PEER_LIMIT_GLOBAL);
  linkWidgetToPref (ui.enableUtpCheck, Prefs::UTP_ENABLED);
  linkWidgetToPref (ui.enablePexCheck, Prefs::PEX_ENABLED);
  linkWidgetToPref (ui.enableDhtCheck, Prefs::DHT_ENABLED);
  linkWidgetToPref (ui.enableLpdCheck, Prefs::LPD_ENABLED);

  ColumnResizer * cr (new ColumnResizer (this));
  cr->addLayout (ui.incomingPeersSectionLayout);
  cr->addLayout (ui.peerLimitsSectionLayout);
  cr->update ();

  connect (ui.testPeerPortButton, SIGNAL (clicked ()), SLOT (onPortTest ()));
  connect (&mySession, SIGNAL (portTested (bool)), SLOT (onPortTested (bool)));
}

/***
****
***/

void
PrefsDialog::onBlocklistDialogDestroyed (QObject * o)
{
  Q_UNUSED (o);

  myBlocklistDialog = 0;
}

void
PrefsDialog::onUpdateBlocklistCancelled ()
{
  disconnect (&mySession, SIGNAL(blocklistUpdated(int)), this, SLOT(onBlocklistUpdated(int)));
  myBlocklistDialog->deleteLater ();
}

void
PrefsDialog::onBlocklistUpdated (int n)
{
  myBlocklistDialog->setText (tr ("<b>Update succeeded!</b><p>Blocklist now has %Ln rule(s).", 0, n));
  myBlocklistDialog->setTextFormat (Qt::RichText);
}

void
PrefsDialog::onUpdateBlocklistClicked ()
{
  myBlocklistDialog = new QMessageBox (QMessageBox::Information,
                                       QString(),
                                       tr ("<b>Update Blocklist</b><p>Getting new blocklist..."),
                                       QMessageBox::Close,
                                       this);
  connect (myBlocklistDialog, SIGNAL(rejected()), this, SLOT(onUpdateBlocklistCancelled()));
  connect (&mySession, SIGNAL(blocklistUpdated(int)), this, SLOT(onBlocklistUpdated(int)));
  myBlocklistDialog->show ();
  mySession.updateBlocklist ();
}

void
PrefsDialog::encryptionEdited (int i)
{
  const int value (qobject_cast<QComboBox*>(sender())->itemData(i).toInt ());
  setPref (Prefs::ENCRYPTION, value);
}

void
PrefsDialog::initPrivacyTab ()
{
  ui.encryptionModeCombo->addItem (tr ("Allow encryption"), 0);
  ui.encryptionModeCombo->addItem (tr ("Prefer encryption"), 1);
  ui.encryptionModeCombo->addItem (tr ("Require encryption"), 2);

  linkWidgetToPref (ui.encryptionModeCombo, Prefs::ENCRYPTION);
  linkWidgetToPref (ui.blocklistCheck, Prefs::BLOCKLIST_ENABLED);
  linkWidgetToPref (ui.blocklistEdit, Prefs::BLOCKLIST_URL);
  linkWidgetToPref (ui.autoUpdateBlocklistCheck, Prefs::BLOCKLIST_UPDATES_ENABLED);

  myBlockWidgets <<
    ui.blocklistEdit <<
    ui.blocklistStatusLabel <<
    ui.updateBlocklistButton <<
    ui.autoUpdateBlocklistCheck;

  ColumnResizer * cr (new ColumnResizer (this));
  cr->addLayout (ui.encryptionSectionLayout);
  cr->addLayout (ui.blocklistSectionLayout);
  cr->update ();

  connect (ui.encryptionModeCombo, SIGNAL (activated (int)), SLOT (encryptionEdited (int)));
  connect (ui.updateBlocklistButton, SIGNAL (clicked ()), SLOT (onUpdateBlocklistClicked ()));

  updateBlocklistLabel ();
}

/***
****
***/

void
PrefsDialog::onIdleLimitChanged ()
{
  //: Spin box suffix, "Stop seeding if idle for: [ 5 minutes ]" (includes leading space after the number, if needed)
  const QString unitsSuffix = tr (" minute(s)", 0, ui.idleLimitSpin->value ());
  if (ui.idleLimitSpin->suffix () != unitsSuffix)
    ui.idleLimitSpin->setSuffix (unitsSuffix);
}

void
PrefsDialog::initSeedingTab ()
{
  linkWidgetToPref (ui.ratioLimitCheck, Prefs::RATIO_ENABLED);
  linkWidgetToPref (ui.ratioLimitSpin, Prefs::RATIO);
  linkWidgetToPref (ui.idleLimitCheck, Prefs::IDLE_LIMIT_ENABLED);
  linkWidgetToPref (ui.idleLimitSpin, Prefs::IDLE_LIMIT);

  connect (ui.idleLimitSpin, SIGNAL (valueChanged (int)), SLOT (onIdleLimitChanged ()));

  onIdleLimitChanged ();
}

void
PrefsDialog::onQueueStalledMinutesChanged ()
{
  //: Spin box suffix, "Download is inactive if data sharing stopped: [ 5 minutes ago ]" (includes leading space after the number, if needed)
  const QString unitsSuffix = tr (" minute(s) ago", 0, ui.queueStalledMinutesSpin->value ());
  if (ui.queueStalledMinutesSpin->suffix () != unitsSuffix)
    ui.queueStalledMinutesSpin->setSuffix (unitsSuffix);
}

void
PrefsDialog::initDownloadingTab ()
{
  if (mySession.isLocal ())
    {
      ui.watchDirStack->setCurrentWidget (ui.watchDirButton);
      ui.downloadDirStack->setCurrentWidget (ui.downloadDirButton);
      ui.incompleteDirStack->setCurrentWidget (ui.incompleteDirButton);
      ui.completionScriptStack->setCurrentWidget (ui.completionScriptButton);

      ui.watchDirButton->setMode (PathButton::DirectoryMode);
      ui.downloadDirButton->setMode (PathButton::DirectoryMode);
      ui.incompleteDirButton->setMode (PathButton::DirectoryMode);
      ui.completionScriptButton->setMode (PathButton::FileMode);

      ui.watchDirButton->setTitle (tr ("Select Watch Directory"));
      ui.downloadDirButton->setTitle (tr ("Select Destination"));
      ui.incompleteDirButton->setTitle (tr ("Select Incomplete Directory"));
      ui.completionScriptButton->setTitle (tr ("Select \"Torrent Done\" Script"));
    }
  else
    {
      ui.watchDirStack->setCurrentWidget (ui.watchDirEdit);
      ui.downloadDirStack->setCurrentWidget (ui.downloadDirEdit);
      ui.incompleteDirStack->setCurrentWidget (ui.incompleteDirEdit);
      ui.completionScriptStack->setCurrentWidget (ui.completionScriptEdit);
    }

  ui.watchDirStack->setFixedHeight (ui.watchDirStack->currentWidget ()->sizeHint ().height ());
  ui.downloadDirStack->setFixedHeight (ui.downloadDirStack->currentWidget ()->sizeHint ().height ());
  ui.incompleteDirStack->setFixedHeight (ui.incompleteDirStack->currentWidget ()->sizeHint ().height ());
  ui.completionScriptStack->setFixedHeight (ui.completionScriptStack->currentWidget ()->sizeHint ().height ());

  ui.watchDirStack->setMinimumWidth (200);

  ui.downloadDirLabel->setBuddy (ui.downloadDirStack->currentWidget ());

  ui.downloadDirFreeSpaceLabel->setSession (mySession);
  ui.downloadDirFreeSpaceLabel->setPath (myPrefs.getString (Prefs::DOWNLOAD_DIR));

  linkWidgetToPref (ui.watchDirCheck, Prefs::DIR_WATCH_ENABLED);
  linkWidgetToPref (ui.watchDirStack->currentWidget (), Prefs::DIR_WATCH);
  linkWidgetToPref (ui.showTorrentOptionsDialogCheck, Prefs::OPTIONS_PROMPT);
  linkWidgetToPref (ui.startAddedTorrentsCheck, Prefs::START);
  linkWidgetToPref (ui.trashTorrentFileCheck, Prefs::TRASH_ORIGINAL);
  linkWidgetToPref (ui.downloadDirStack->currentWidget (), Prefs::DOWNLOAD_DIR);
  linkWidgetToPref (ui.downloadQueueSizeSpin, Prefs::DOWNLOAD_QUEUE_SIZE);
  linkWidgetToPref (ui.queueStalledMinutesSpin, Prefs::QUEUE_STALLED_MINUTES);
  linkWidgetToPref (ui.renamePartialFilesCheck, Prefs::RENAME_PARTIAL_FILES);
  linkWidgetToPref (ui.incompleteDirCheck, Prefs::INCOMPLETE_DIR_ENABLED);
  linkWidgetToPref (ui.incompleteDirStack->currentWidget (), Prefs::INCOMPLETE_DIR);
  linkWidgetToPref (ui.completionScriptCheck, Prefs::SCRIPT_TORRENT_DONE_ENABLED);
  linkWidgetToPref (ui.completionScriptStack->currentWidget (), Prefs::SCRIPT_TORRENT_DONE_FILENAME);

  ColumnResizer * cr (new ColumnResizer (this));
  cr->addLayout (ui.addingSectionLayout);
  cr->addLayout (ui.downloadQueueSectionLayout);
  cr->addLayout (ui.incompleteSectionLayout);
  cr->update ();

  connect (ui.queueStalledMinutesSpin, SIGNAL (valueChanged (int)), SLOT (onQueueStalledMinutesChanged ()));

  onQueueStalledMinutesChanged ();
}

/***
****
***/

PrefsDialog::PrefsDialog (Session& session, Prefs& prefs, QWidget * parent):
  QDialog (parent),
  myIsServer (session.isServer ()),
  mySession (session),
  myPrefs (prefs)
{
  ui.setupUi (this);

  initSpeedTab ();
  initDownloadingTab ();
  initSeedingTab ();
  initPrivacyTab ();
  initNetworkTab ();
  initDesktopTab ();
  initRemoteTab ();

  connect (&mySession, SIGNAL (sessionUpdated ()), SLOT (sessionUpdated ()));

  QList<int> keys;
  keys << Prefs::RPC_ENABLED
       << Prefs::ALT_SPEED_LIMIT_ENABLED
       << Prefs::ALT_SPEED_LIMIT_TIME_ENABLED
       << Prefs::ENCRYPTION
       << Prefs::BLOCKLIST_ENABLED
       << Prefs::DIR_WATCH
       << Prefs::DOWNLOAD_DIR
       << Prefs::INCOMPLETE_DIR
       << Prefs::INCOMPLETE_DIR_ENABLED
       << Prefs::SCRIPT_TORRENT_DONE_FILENAME;
  for (const int key: keys)
    refreshPref (key);

  // if it's a remote session, disable the preferences
  // that don't work in remote sessions
  if (!myIsServer)
    {
      for (QWidget * const w: myUnsupportedWhenRemote)
        {
          w->setToolTip (tr ("Not supported by remote sessions"));
          w->setEnabled (false);
        }
    }

  adjustSize ();
}

PrefsDialog::~PrefsDialog ()
{
}

void
PrefsDialog::setPref (int key, const QVariant& v)
{
  myPrefs.set (key, v);
  refreshPref (key);
}

/***
****
***/

void
PrefsDialog::sessionUpdated ()
{
  updateBlocklistLabel ();
}

void
PrefsDialog::updateBlocklistLabel ()
{
  const int n = mySession.blocklistSize ();
  ui.blocklistStatusLabel->setText (tr ("<i>Blocklist contains %Ln rule(s)</i>", 0, n));
}

void
PrefsDialog::refreshPref (int key)
{
  switch (key)
    {
      case Prefs::RPC_ENABLED:
      case Prefs::RPC_WHITELIST_ENABLED:
      case Prefs::RPC_AUTH_REQUIRED:
        {
          const bool enabled (myPrefs.getBool (Prefs::RPC_ENABLED));
          const bool whitelist (myPrefs.getBool (Prefs::RPC_WHITELIST_ENABLED));
          const bool auth (myPrefs.getBool (Prefs::RPC_AUTH_REQUIRED));
          for (QWidget * const w: myWebWhitelistWidgets)
            w->setEnabled (enabled && whitelist);
          for (QWidget * const w: myWebAuthWidgets)
            w->setEnabled (enabled && auth);
          for (QWidget * const w: myWebWidgets)
            w->setEnabled (enabled);
          break;
        }

      case Prefs::ALT_SPEED_LIMIT_TIME_ENABLED:
        {
          const bool enabled = myPrefs.getBool (key);
          for (QWidget * const w: mySchedWidgets)
            w->setEnabled (enabled);
          break;
        }

      case Prefs::BLOCKLIST_ENABLED:
        {
          const bool enabled = myPrefs.getBool (key);
          for (QWidget * const w: myBlockWidgets)
            w->setEnabled (enabled);
          break;
        }

      case Prefs::DIR_WATCH:
        ui.watchDirButton->setText (QFileInfo (myPrefs.getString (Prefs::DIR_WATCH)).fileName ());
        break;

      case Prefs::SCRIPT_TORRENT_DONE_FILENAME:
        {
          const QString path (myPrefs.getString (key));
          ui.completionScriptButton->setText (QFileInfo (path).fileName ());
          break;
        }

      case Prefs::PEER_PORT:
        ui.peerPortStatusLabel->setText (tr ("Status unknown"));
        ui.testPeerPortButton->setEnabled (true);
        break;

      case Prefs::DOWNLOAD_DIR:
        {
          const QString path (myPrefs.getString (key));
          ui.downloadDirButton->setText (QFileInfo (path).fileName ());
          ui.downloadDirFreeSpaceLabel->setPath (path);
          break;
        }

      case Prefs::INCOMPLETE_DIR:
        {
          QString path (myPrefs.getString (key));
          ui.incompleteDirButton->setText (QFileInfo (path).fileName ());
          break;
        }

      default:
        break;
    }

  key2widget_t::iterator it (myWidgets.find (key));
  if (it != myWidgets.end ())
    {
      QWidget * w (it.value ());

      if (!updateWidgetValue (w, key))
        {
          if (key == Prefs::ENCRYPTION)
            {
              QComboBox * comboBox (qobject_cast<QComboBox*> (w));
              const int index = comboBox->findData (myPrefs.getInt (key));
              comboBox->setCurrentIndex (index);
            }
        }
    }
}