/******************************************************************************\
 * Copyright (c) 2004-2020
 *
 * Author(s):
 *  Volker Fischer
 *
 ******************************************************************************
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later 
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
\******************************************************************************/

#include "clientdlg.h"


/* Implementation *************************************************************/
CClientDlg::CClientDlg ( CClient*        pNCliP,
                         CSettings*      pNSetP,
                         const QString&  strConnOnStartupAddress,
                         const int       iCtrlMIDIChannel,
                         const bool      bNewShowComplRegConnList,
                         const bool      bShowAnalyzerConsole,
                         QWidget*        parent,
                         Qt::WindowFlags f ) :
    QDialog             ( parent, f ),
    pClient             ( pNCliP ),
    pSettings           ( pNSetP ),
    bConnectDlgWasShown ( false ),
    bMIDICtrlUsed       ( iCtrlMIDIChannel != INVALID_MIDI_CH ),
    ClientSettingsDlg   ( pNCliP, parent, Qt::Window ),
    ChatDlg             ( parent, Qt::Window ),
    ConnectDlg          ( pNCliP, bNewShowComplRegConnList, parent, Qt::Dialog ),
    AnalyzerConsole     ( pNCliP, parent, Qt::Window ),
    MusicianProfileDlg  ( pNCliP, parent )
{
    setupUi ( this );


    // Add help text to controls -----------------------------------------------
    // input level meter
    QString strInpLevH = "<b>" + tr ( "Input Level Meter" ) + ":</b> " + tr ( "This shows "
        "the level of the two stereo channels "
        "for your audio input." ) + "<br>" +
         tr ( "Make sure not to clip the input signal to avoid distortions of the "
        "audio signal." );

    QString strInpLevHTT = tr ( "If the application "
        "is connected to a server and "
        "you play your instrument/sing into the microphone, the VU "
        "meter should flicker. If this is not the case, you have "
        "probably selected the wrong input channel (e.g. 'line in' instead "
        "of the microphone input) or set the input gain too low in the "
        "(Windows) audio mixer." ) + "<br>" + tr ( "For proper usage of the "
        "application, you should not hear your singing/instrument through "
        "the loudspeaker or your headphone when the software is not connected."
        "This can be achieved by muting your input audio channel in the "
        "Playback mixer (not the Recording mixer!)." ) + TOOLTIP_COM_END_TEXT;

    QString strInpLevHAccText  = tr ( "Input level meter" );
    QString strInpLevHAccDescr = tr ( "Simulates an analog LED level meter." );

    lblInputLEDMeter->setWhatsThis           ( strInpLevH );
    lblLevelMeterLeft->setWhatsThis          ( strInpLevH );
    lblLevelMeterRight->setWhatsThis         ( strInpLevH );
    lbrInputLevelL->setWhatsThis             ( strInpLevH );
    lbrInputLevelL->setAccessibleName        ( strInpLevHAccText );
    lbrInputLevelL->setAccessibleDescription ( strInpLevHAccDescr );
    lbrInputLevelL->setToolTip               ( strInpLevHTT );
    lbrInputLevelR->setWhatsThis             ( strInpLevH );
    lbrInputLevelR->setAccessibleName        ( strInpLevHAccText );
    lbrInputLevelR->setAccessibleDescription ( strInpLevHAccDescr );
    lbrInputLevelR->setToolTip               ( strInpLevHTT );

    // connect/disconnect button
    butConnect->setWhatsThis ( "<b>" + tr ( "Connect/Disconnect Button" ) + ":</b> " +
        tr ( "Opens a dialog where you can select a server to connect to. "
        "If you are connected, pressing this button will end the session." ) );

    butConnect->setAccessibleName (
        tr ( "Connect and disconnect toggle button" ) );

    butConnect->setAccessibleDescription ( tr ( "Clicking on this "
        "button changes the caption of the button from Connect to "
        "Disconnect, i.e., it implements a toggle functionality for connecting "
        "and disconnecting the application." ) );

    // local audio input fader
    QString strAudFader = "<b>" + tr ( "Local Audio Input Fader" ) + ":</b> " +
        tr ( "Controls the relative levels of the left and right local audio "
        "channels. For a mono signal it acts as a pan between the two channels."
        "For example, if a microphone is connected to "
        "the right input channel and an instrument is connected to the left "
        "input channel which is much louder than the microphone, move the "
        "audio fader in a direction where the label above the fader shows " ) +
        "<i>" + tr ( "L" ) + " -x</i>" + tr ( ", where" ) + " <i>x</i> " +
        tr ( "is the current attenuation indicator." );

    lblAudioPan->setWhatsThis      ( strAudFader );
    lblAudioPanValue->setWhatsThis ( strAudFader );
    sldAudioPan->setWhatsThis      ( strAudFader );

    sldAudioPan->setAccessibleName ( tr ( "Local audio input fader (left/right)" ) );

    // reverberation level
    QString strAudReverb = "<b>" + tr ( "Reverb effect" ) + ":</b> " +
        tr ( "Reverb can be applied to one local mono audio channel or to both "
        "channels in stereo mode. The mono channel selection and the "
        "reverb level can be modified. For example, if "
        "a microphone signal is fed in to the right audio channel of the "
        "sound card and a reverb effect needs to be applied, set the "
        "channel selector to right and move the fader upwards until the "
        "desired reverb level is reached." );

    lblAudioReverb->setWhatsThis ( strAudReverb );
    sldAudioReverb->setWhatsThis ( strAudReverb );

    sldAudioReverb->setAccessibleName ( tr ( "Reverb effect level setting" ) );

    // reverberation channel selection
    QString strRevChanSel = "<b>" + tr ( "Reverb Channel Selection" ) + ":</b> " +
        tr ( "With these radio buttons the audio input channel on which the "
        "reverb effect is applied can be chosen. Either the left "
        "or right input channel can be selected." );

    rbtReverbSelL->setWhatsThis ( strRevChanSel );
    rbtReverbSelL->setAccessibleName ( tr ( "Left channel selection for reverb" ) );
    rbtReverbSelR->setWhatsThis ( strRevChanSel );
    rbtReverbSelR->setAccessibleName ( tr ( "Right channel selection for reverb" ) );

    // delay LED
    QString strLEDDelay = "<b>" + tr ( "Delay Status LED" ) + ":</b> " +
        tr ( "Shows the current audio delay status:" ) +
        "<ul>"
        "<li>" "<b>" + tr ( "Green" ) + ":</b> " + tr ( "The delay is perfect for a jam "
        "session." ) + "</li>"
        "<li>" "<b>" + tr ( "Yellow" ) + ":</b> " + tr ( "A session is still possible "
        "but it may be harder to play." ) + "</li>"
        "<li>" "<b>" + tr ( "Red" ) + ":</b> " + tr ( "The delay is too large for "
        "jamming." ) + "</li>"
        "</ul>";

    lblDelay->setWhatsThis ( strLEDDelay );
    ledDelay->setWhatsThis ( strLEDDelay );
    ledDelay->setToolTip ( tr ( "If this LED indicator turns red, "
        "you will not have much fun using the application." ) +
         TOOLTIP_COM_END_TEXT );

    ledDelay->setAccessibleName ( tr ( "Delay status LED indicator" ) );

    // buffers LED
    QString strLEDBuffers = "<b>" + tr ( "Buffers Status LED" ) + ":</b> " +
        tr ( "The buffers status LED shows the current audio/streaming "
        "status. If the light is red, the audio stream is interrupted. "
        "This is caused by one of the following problems:" ) +
        "<ul>"
        "<li>" + tr ( "The network jitter buffer is not large enough for the current "
        "network/audio interface jitter." ) + "</li>"
        "<li>" + tr ( "The sound card's buffer delay (buffer size) is too small "
        "(see Settings window)." ) + "</li>"
        "<li>" + tr ( "The upload or download stream rate is too high for your "
        "internet bandwidth." ) + "</li>"
        "<li>" + tr ( "The CPU of the client or server is at 100%." ) + "</li>"
        "</ul>";

    lblBuffers->setWhatsThis ( strLEDBuffers );
    ledBuffers->setWhatsThis ( strLEDBuffers );

    ledBuffers->setAccessibleName ( tr ( "Buffers status LED indicator" ) );

    // init GUI design
    SetGUIDesign ( pClient->GetGUIDesign() );

    // reset mixer board
    MainMixerBoard->HideAll();

    // restore channel level display preference
    MainMixerBoard->SetDisplayChannelLevels ( pClient->GetDisplayChannelLevels() );

    // restore fader settings
    MainMixerBoard->vecStoredFaderTags   = pClient->vecStoredFaderTags;
    MainMixerBoard->vecStoredFaderLevels = pClient->vecStoredFaderLevels;
    MainMixerBoard->vecStoredPanValues   = pClient->vecStoredPanValues;
    MainMixerBoard->vecStoredFaderIsSolo = pClient->vecStoredFaderIsSolo;
    MainMixerBoard->vecStoredFaderIsMute = pClient->vecStoredFaderIsMute;
    MainMixerBoard->iNewClientFaderLevel = pClient->iNewClientFaderLevel;

    // init status label
    OnTimerStatus();

    // init connection button text
    butConnect->setText ( tr ( "C&onnect" ) );

    // init input level meter bars
    lbrInputLevelL->setValue ( 0 );
    lbrInputLevelR->setValue ( 0 );

    // init status LEDs
    ledBuffers->Reset();
    ledDelay->Reset();

    // init audio in fader
    sldAudioPan->setRange ( AUD_FADER_IN_MIN, AUD_FADER_IN_MAX );
    sldAudioPan->setTickInterval ( AUD_FADER_IN_MAX / 5 );
    UpdateAudioFaderSlider();

    // init audio reverberation
    sldAudioReverb->setRange ( 0, AUD_REVERB_MAX );
    const int iCurAudReverb = pClient->GetReverbLevel();
    sldAudioReverb->setValue ( iCurAudReverb );
    sldAudioReverb->setTickInterval ( AUD_REVERB_MAX / 5 );

    // init reverb channel
    UpdateRevSelection();

    // init connect dialog
    ConnectDlg.SetShowAllMusicians ( pClient->bConnectDlgShowAllMusicians );

    // set window title (with no clients connected -> "0")
    SetMyWindowTitle ( 0 );


    // Connect on startup ------------------------------------------------------
    if ( !strConnOnStartupAddress.isEmpty() )
    {
        // initiate connection (always show the address in the mixer board
        // (no alias))
        Connect ( strConnOnStartupAddress, strConnOnStartupAddress );
    }


    // Mac Workaround:
    // If the connect button is the default button, on Mac it is highlighted
    // by fading in and out a blue backgroud color. This operation consumes so
    // much CPU that we get audio interruptions.
    // Better solution: increase thread priority of worker thread (since the
    // user can always highlight the button manually, too) -> TODO
#if defined ( __APPLE__ ) || defined ( __MACOSX )
    butConnect->setDefault ( false );
#endif


    // View menu  --------------------------------------------------------------
    pViewMenu = new QMenu ( tr ( "&View" ), this );

    pViewMenu->addAction ( tr ( "&Connection Setup..." ), this,
        SLOT ( OnOpenConnectionSetupDialog() ) );

    pViewMenu->addAction ( tr ( "My &Profile..." ), this,
        SLOT ( OnOpenMusicianProfileDialog() ) );

    pViewMenu->addAction ( tr ( "C&hat..." ), this,
        SLOT ( OnOpenChatDialog() ) );

    pViewMenu->addAction ( tr ( "&Settings..." ), this,
        SLOT ( OnOpenGeneralSettings() ) );

    // optionally show analyzer console entry
    if ( bShowAnalyzerConsole )
    {
        pViewMenu->addAction ( tr ( "&Analyzer Console..." ), this,
            SLOT ( OnOpenAnalyzerConsole() ) );
    }

    pViewMenu->addSeparator();

    pViewMenu->addAction ( tr ( "E&xit" ), this,
        SLOT ( close() ), QKeySequence ( Qt::CTRL + Qt::Key_Q ) );


    // Edit menu  --------------------------------------------------------------
    pEditMenu = new QMenu ( tr ( "&Edit" ), this );

    pEditMenu->addAction ( tr ( "&Sort Channel Users by Name" ), this,
        SLOT ( OnSortChannelsByName() ), QKeySequence ( Qt::CTRL + Qt::Key_N ) );


    // Main menu bar -----------------------------------------------------------
    pMenu = new QMenuBar ( this );

    pMenu->addMenu ( pViewMenu );
    pMenu->addMenu ( pEditMenu );
    pMenu->addMenu ( new CHelpMenu ( true, this ) );

    // Now tell the layout about the menu
    layout()->setMenuBar ( pMenu );


    // Instrument pictures popup menu ------------------------------------------
    pInstrPictPopupMenu = new QMenu ( this );

    // add an entry for all known instruments
    for ( int iCurInst = 0; iCurInst < CInstPictures::GetNumAvailableInst(); iCurInst++ )
    {
        // create a menu action with text and image
        QAction* pCurAction = new QAction (
            QIcon ( CInstPictures::GetResourceReference ( iCurInst ) ),
            CInstPictures::GetName ( iCurInst ),
            this );

        // add data to identify the action data when it is triggered
        pCurAction->setData ( iCurInst );

        pInstrPictPopupMenu->addAction ( pCurAction );
    }


    // Country flag icons popup menu -------------------------------------------
    pCountryFlagPopupMenu = new QMenu ( this );

    // add an entry for all known country flags
    for ( int iCurCntry = static_cast<int> ( QLocale::AnyCountry );
          iCurCntry < static_cast<int> ( QLocale::LastCountry ); iCurCntry++ )
    {
        // the "Default" country gets a special icon
        QIcon   CurFlagIcon;
        QString sCurCountryName;

        if ( static_cast<QLocale::Country> ( iCurCntry ) == QLocale::AnyCountry )
        {
            // default icon and name for no flag selected
            CurFlagIcon.addFile ( ":/png/flags/res/flags/flagnone.png" );
            sCurCountryName = tr ( "None" );
        }
        else
        {
            // get current country enum
            QLocale::Country eCountry =
                static_cast<QLocale::Country> ( iCurCntry );

            // get resource file name
            CurFlagIcon.addFile ( CLocale::GetCountryFlagIconsResourceReference ( eCountry ) );

            // get the country name
            sCurCountryName = QLocale::countryToString ( eCountry );
        }

        // only add the entry if a flag is available
        if ( !CurFlagIcon.isNull() )
        {
            // create a menu action with text and image
            QAction* pCurAction =
                new QAction ( CurFlagIcon, sCurCountryName, this );

            // add data to identify the action data when it is triggered
            pCurAction->setData ( iCurCntry );

            pCountryFlagPopupMenu->addAction ( pCurAction );
        }
    }


    // Window positions --------------------------------------------------------
    // main window
    if ( !pClient->vecWindowPosMain.isEmpty() && !pClient->vecWindowPosMain.isNull() )
    {
        restoreGeometry ( pClient->vecWindowPosMain );
    }

    // settings window
    if ( !pClient->vecWindowPosSettings.isEmpty() && !pClient->vecWindowPosSettings.isNull() )
    {
        ClientSettingsDlg.restoreGeometry ( pClient->vecWindowPosSettings );
    }

    if ( pClient->bWindowWasShownSettings )
    {
        ShowGeneralSettings();
    }

    // chat window
    if ( !pClient->vecWindowPosChat.isEmpty() && !pClient->vecWindowPosChat.isNull() )
    {
        ChatDlg.restoreGeometry ( pClient->vecWindowPosChat );
    }

    if ( pClient->bWindowWasShownChat )
    {
        ShowChatWindow();
    }

    // musician profile window
    if ( !pClient->vecWindowPosProfile.isEmpty() && !pClient->vecWindowPosProfile.isNull() )
    {
        MusicianProfileDlg.restoreGeometry ( pClient->vecWindowPosProfile );
    }

    if ( pClient->bWindowWasShownProfile )
    {
        ShowMusicianProfileDialog();
    }

    // connection setup window
    if ( !pClient->vecWindowPosConnect.isEmpty() && !pClient->vecWindowPosConnect.isNull() )
    {
        ConnectDlg.restoreGeometry ( pClient->vecWindowPosConnect );
    }


    // Connections -------------------------------------------------------------
    // push buttons
    QObject::connect ( butConnect, &QPushButton::clicked,
        this, &CClientDlg::OnConnectDisconBut );

    // check boxes
    QObject::connect ( chbSettings, &QCheckBox::stateChanged,
        this, &CClientDlg::OnSettingsStateChanged );

    QObject::connect ( chbChat, &QCheckBox::stateChanged,
        this, &CClientDlg::OnChatStateChanged );

    QObject::connect ( chbLocalMute, &QCheckBox::stateChanged,
        this, &CClientDlg::OnLocalMuteStateChanged );

    // timers
    QObject::connect ( &TimerSigMet, &QTimer::timeout,
        this, &CClientDlg::OnTimerSigMet );

    QObject::connect ( &TimerBuffersLED, &QTimer::timeout,
        this, &CClientDlg::OnTimerBuffersLED );

    QObject::connect ( &TimerStatus, &QTimer::timeout,
        this, &CClientDlg::OnTimerStatus );

    QObject::connect ( &TimerPing, &QTimer::timeout,
        this, &CClientDlg::OnTimerPing );

    // sliders
    QObject::connect ( sldAudioPan, &QSlider::valueChanged,
        this, &CClientDlg::OnAudioPanValueChanged );

    QObject::connect ( sldAudioReverb, &QSlider::valueChanged,
        this, &CClientDlg::OnAudioReverbValueChanged );

    // radio buttons
    QObject::connect ( rbtReverbSelL, &QRadioButton::clicked,
        this, &CClientDlg::OnReverbSelLClicked );

    QObject::connect ( rbtReverbSelR, &QRadioButton::clicked,
        this, &CClientDlg::OnReverbSelRClicked );

    // other
    QObject::connect ( pClient, &CClient::ConClientListMesReceived,
        this, &CClientDlg::OnConClientListMesReceived );

    QObject::connect ( pClient, &CClient::Disconnected,
        this, &CClientDlg::OnDisconnected );

    QObject::connect ( pClient, &CClient::CentralServerAddressTypeChanged,
        this, &CClientDlg::OnCentralServerAddressTypeChanged );

    QObject::connect ( pClient, &CClient::ChatTextReceived,
        this, &CClientDlg::OnChatTextReceived );

    QObject::connect ( pClient, &CClient::ClientIDReceived,
        this, &CClientDlg::OnClientIDReceived );

    QObject::connect ( pClient, &CClient::MuteStateHasChangedReceived,
        this, &CClientDlg::OnMuteStateHasChangedReceived );

    // This connection is a special case. On receiving a licence required message via the
    // protocol, a modal licence dialog is opened. Since this blocks the thread, we need
    // a queued connection to make sure the core protocol mechanism is not blocked, too.
    qRegisterMetaType<ELicenceType> ( "ELicenceType" );
    QObject::connect ( pClient, &CClient::LicenceRequired,
        this, &CClientDlg::OnLicenceRequired, Qt::QueuedConnection );

    QObject::connect ( pClient, &CClient::PingTimeReceived,
        this, &CClientDlg::OnPingTimeResult );

    QObject::connect ( pClient, &CClient::CLServerListReceived,
        this, &CClientDlg::OnCLServerListReceived );

    QObject::connect ( pClient, &CClient::CLConnClientsListMesReceived,
        this, &CClientDlg::OnCLConnClientsListMesReceived );

    QObject::connect ( pClient, &CClient::CLPingTimeWithNumClientsReceived,
        this, &CClientDlg::OnCLPingTimeWithNumClientsReceived );

    QObject::connect ( pClient, &CClient::ControllerInFaderLevel,
        this, &CClientDlg::OnControllerInFaderLevel );

    QObject::connect ( pClient, &CClient::CLChannelLevelListReceived,
        this, &CClientDlg::OnCLChannelLevelListReceived );

    QObject::connect ( pClient, &CClient::VersionAndOSReceived,
        this, &CClientDlg::OnVersionAndOSReceived );

#ifdef ENABLE_CLIENT_VERSION_AND_OS_DEBUGGING
    QObject::connect ( pClient, &CClient::CLVersionAndOSReceived,
        this, &CClientDlg::OnCLVersionAndOSReceived );
#endif

    QObject::connect ( QCoreApplication::instance(), &QCoreApplication::aboutToQuit,
        this, &CClientDlg::OnAboutToQuit );

    QObject::connect ( &ClientSettingsDlg, &CClientSettingsDlg::GUIDesignChanged,
        this, &CClientDlg::OnGUIDesignChanged );

    QObject::connect ( &ClientSettingsDlg, &CClientSettingsDlg::DisplayChannelLevelsChanged,
        this, &CClientDlg::OnDisplayChannelLevelsChanged );

    QObject::connect ( &ClientSettingsDlg, &CClientSettingsDlg::AudioChannelsChanged,
        this, &CClientDlg::OnAudioChannelsChanged );

    QObject::connect ( &ClientSettingsDlg, &CClientSettingsDlg::NewClientLevelChanged,
        this, &CClientDlg::OnNewClientLevelChanged );

    QObject::connect ( MainMixerBoard, &CAudioMixerBoard::ChangeChanGain,
        this, &CClientDlg::OnChangeChanGain );

    QObject::connect ( MainMixerBoard, &CAudioMixerBoard::ChangeChanPan,
        this, &CClientDlg::OnChangeChanPan );

    QObject::connect ( MainMixerBoard, &CAudioMixerBoard::NumClientsChanged,
        this, &CClientDlg::OnNumClientsChanged );

    QObject::connect ( &ChatDlg, &CChatDlg::NewLocalInputText,
        this, &CClientDlg::OnNewLocalInputText );

    QObject::connect ( &ConnectDlg, &CConnectDlg::ReqServerListQuery,
        this, &CClientDlg::OnReqServerListQuery );

    // note that this connection must be a queued connection, otherwise the server list ping
    // times are not accurate and the client list may not be retrieved for all servers listed
    // (it seems the sendto() function needs to be called from different threads to fire the
    // packet immediately and do not collect packets before transmitting)
    QObject::connect ( &ConnectDlg, &CConnectDlg::CreateCLServerListPingMes,
        this, &CClientDlg::OnCreateCLServerListPingMes, Qt::QueuedConnection );

    QObject::connect ( &ConnectDlg, &CConnectDlg::CreateCLServerListReqVerAndOSMes,
        this, &CClientDlg::OnCreateCLServerListReqVerAndOSMes );

    QObject::connect ( &ConnectDlg, &CConnectDlg::CreateCLServerListReqConnClientsListMes,
        this, &CClientDlg::OnCreateCLServerListReqConnClientsListMes );

    QObject::connect ( &ConnectDlg, &CConnectDlg::accepted,
        this, &CClientDlg::OnConnectDlgAccepted );


    // Initializations which have to be done after the signals are connected ---
    // start timer for status bar
    TimerStatus.start ( LED_BAR_UPDATE_TIME_MS );

    // restore connect dialog
    if ( pClient->bWindowWasShownConnect )
    {
        ShowConnectionSetupDialog();
    }
}

void CClientDlg::closeEvent ( QCloseEvent* Event )
{
    // store window positions
    pClient->vecWindowPosMain     = saveGeometry();
    pClient->vecWindowPosSettings = ClientSettingsDlg.saveGeometry();
    pClient->vecWindowPosChat     = ChatDlg.saveGeometry();
    pClient->vecWindowPosProfile  = MusicianProfileDlg.saveGeometry();
    pClient->vecWindowPosConnect  = ConnectDlg.saveGeometry();

    pClient->bWindowWasShownSettings = ClientSettingsDlg.isVisible();
    pClient->bWindowWasShownChat     = ChatDlg.isVisible();
    pClient->bWindowWasShownProfile  = MusicianProfileDlg.isVisible();
    pClient->bWindowWasShownConnect  = ConnectDlg.isVisible();

    // if settings/connect dialog or chat dialog is open, close it
    ClientSettingsDlg.close();
    ChatDlg.close();
    MusicianProfileDlg.close();
    ConnectDlg.close();
    AnalyzerConsole.close();

    // if connected, terminate connection
    if ( pClient->IsRunning() )
    {
        pClient->Stop();
    }

    // store mixer fader settings (we have to hide all mixer faders first to
    // initiate a storage of the current mixer fader levels in case we are
    // just in a connected state) and other settings
    MainMixerBoard->HideAll();
    pClient->vecStoredFaderTags          = MainMixerBoard->vecStoredFaderTags;
    pClient->vecStoredFaderLevels        = MainMixerBoard->vecStoredFaderLevels;
    pClient->vecStoredPanValues          = MainMixerBoard->vecStoredPanValues;
    pClient->vecStoredFaderIsSolo        = MainMixerBoard->vecStoredFaderIsSolo;
    pClient->vecStoredFaderIsMute        = MainMixerBoard->vecStoredFaderIsMute;
    pClient->iNewClientFaderLevel        = MainMixerBoard->iNewClientFaderLevel;
    pClient->bConnectDlgShowAllMusicians = ConnectDlg.GetShowAllMusicians();

    // default implementation of this event handler routine
    Event->accept();
}

void CClientDlg::UpdateAudioFaderSlider()
{
    // update slider and label of audio fader
    const int iCurAudInFader = pClient->GetAudioInFader();
    sldAudioPan->setValue ( iCurAudInFader );

    // show in label the center position and what channel is
    // attenuated
    if ( iCurAudInFader == AUD_FADER_IN_MIDDLE )
    {
        lblAudioPanValue->setText ( tr ( "Center" ) );
    }
    else
    {
        if ( iCurAudInFader > AUD_FADER_IN_MIDDLE )
        {
            // attenuation on right channel
            lblAudioPanValue->setText ( tr ( "R" ) + " -" +
                QString().setNum ( iCurAudInFader - AUD_FADER_IN_MIDDLE ) );
        }
        else
        {
            // attenuation on left channel
            lblAudioPanValue->setText ( tr ( "L" ) + " -" +
                QString().setNum ( AUD_FADER_IN_MIDDLE - iCurAudInFader ) );
        }
    }
}

void CClientDlg::UpdateRevSelection()
{
    if ( pClient->GetAudioChannels() == CC_STEREO )
    {
        // for stereo make channel selection invisible since
        // reverberation effect is always applied to both channels
        rbtReverbSelL->setVisible ( false );
        rbtReverbSelR->setVisible ( false );
    }
    else
    {
        // make radio buttons visible
        rbtReverbSelL->setVisible ( true );
        rbtReverbSelR->setVisible ( true );

        // update value
        if ( pClient->IsReverbOnLeftChan() )
        {
            rbtReverbSelL->setChecked ( true );
        }
        else
        {
            rbtReverbSelR->setChecked ( true );
        }
    }

    // update visibility of the pan controls in the audio mixer board (pan is not supported for mono)
    MainMixerBoard->SetDisplayPans ( pClient->GetAudioChannels() != CC_MONO );
}

void CClientDlg::OnAudioPanValueChanged ( int value )
{
    pClient->SetAudioInFader ( value );
    UpdateAudioFaderSlider();
}

void CClientDlg::OnConnectDlgAccepted()
{
    // We had an issue that the accepted signal was emit twice if a list item was double
    // clicked in the connect dialog. To avoid this we introduced a flag which makes sure
    // we process the accepted signal only once after the dialog was initially shown.
    if ( bConnectDlgWasShown )
    {
        // get the address from the connect dialog
        QString strSelectedAddress = ConnectDlg.GetSelectedAddress();

        // only store new host address in our data base if the address is
        // not empty and it was not a server list item (only the addresses
        // typed in manually are stored by definition)
        if ( !strSelectedAddress.isEmpty() &&
             !ConnectDlg.GetServerListItemWasChosen() )
        {
            // store new address at the top of the list, if the list was already
            // full, the last element is thrown out
            pClient->vstrIPAddress.StringFiFoWithCompare ( strSelectedAddress );
        }

        // get name to be set in audio mixer group box title
        QString strMixerBoardLabel;

        if ( ConnectDlg.GetServerListItemWasChosen() )
        {
            // in case a server in the server list was chosen,
            // display the server name of the server list
            strMixerBoardLabel = ConnectDlg.GetSelectedServerName();
        }
        else
        {
            // an item of the server address combo box was chosen,
            // just show the address string as it was entered by the
            // user
            strMixerBoardLabel = strSelectedAddress;

            // special case: if the address is empty, we substitude the default
            // central server address so that a user which just pressed the connect
            // button without selecting an item in the table or manually entered an
            // address gets a successful connection
            if ( strSelectedAddress.isEmpty() )
            {
                strSelectedAddress = DEFAULT_SERVER_ADDRESS;
                strMixerBoardLabel = tr ( "Central Server" );
            }
        }

        // first check if we are already connected, if this is the case we have to
        // disconnect the old server first
        if ( pClient->IsRunning() )
        {
            Disconnect();
        }

        // initiate connection
        Connect ( strSelectedAddress, strMixerBoardLabel );

        // reset flag
        bConnectDlgWasShown = false;
    }
}

void CClientDlg::OnConnectDisconBut()
{
    // the connect/disconnect button implements a toggle functionality
    if ( pClient->IsRunning() )
    {
        Disconnect();
    }
    else
    {
        ShowConnectionSetupDialog();
    }
}

void CClientDlg::OnCentralServerAddressTypeChanged()
{
    // if the server list is shown and the server type was changed, update the list
    if ( ConnectDlg.isVisible() )
    {
        ConnectDlg.SetCentralServerAddress ( NetworkUtil::GetCentralServerAddress ( pClient->GetCentralServerAddressType(),
                                                                                    pClient->GetServerListCentralServerAddress() ) );

        ConnectDlg.RequestServerList();
    }
}

void CClientDlg::OnVersionAndOSReceived ( COSUtil::EOpSystemType ,
                                          QString                strVersion )
{
    // check if Pan is supported by the server (minimum version is 3.5.4)
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
    if ( QVersionNumber::compare ( QVersionNumber::fromString ( strVersion ), QVersionNumber ( 3, 5, 4 ) ) >= 0 )
    {
        MainMixerBoard->SetPanIsSupported();
    }
#endif
}

void CClientDlg::OnChatTextReceived ( QString strChatText )
{
    ChatDlg.AddChatText ( strChatText );

    // open window (note that we do not want to force the dialog to be upfront
    // always when a new message arrives since this is annoying)
    ShowChatWindow ( false );

    UpdateDisplay();
}

void CClientDlg::OnLicenceRequired ( ELicenceType eLicenceType )
{
    // right now only the creative common licence is supported
    if ( eLicenceType == LT_CREATIVECOMMONS )
    {
        CLicenceDlg LicenceDlg;

        // mute the client output stream
        pClient->SetMuteOutStream ( true );

        // Open the licence dialog and check if the licence was accepted. In
        // case the dialog is just closed or the decline button was pressed,
        // disconnect from that server.
        if ( !LicenceDlg.exec() )
        {
            Disconnect();
        }

        // unmute the client output stream if local mute button is not pressed
        if ( chbLocalMute->checkState() == Qt::Unchecked )
        {
            pClient->SetMuteOutStream ( false );
        }
    }
}

void CClientDlg::OnConClientListMesReceived ( CVector<CChannelInfo> vecChanInfo )
{
    // show channel numbers if --ctrlmidich is used (#241, #95)
    if ( bMIDICtrlUsed )
    {
        for ( int i = 0; i < vecChanInfo.Size(); i++ )
        {
            vecChanInfo[i].strName.prepend ( QString().setNum ( vecChanInfo[i].iChanID ) + ":" );
        }
    }

    // update mixer board with the additional client infos
    MainMixerBoard->ApplyNewConClientList ( vecChanInfo );
}

void CClientDlg::OnNumClientsChanged ( int iNewNumClients )
{
    // update window title
    SetMyWindowTitle ( iNewNumClients );
}

void CClientDlg::SetMyWindowTitle ( const int iNumClients )
{
    // show number of connected clients in window title (and therefore also in
    // the task bar of the OS)
    if ( iNumClients == 0 )
    {
        // only application name
        setWindowTitle ( pClient->strClientName );
    }
    else
    {
        if ( iNumClients == 1 )
        {
            setWindowTitle ( QString ( pClient->strClientName ) + " (1 " + tr ( "user" ) + ")" );
        }
        else
        {
            setWindowTitle ( QString ( pClient->strClientName ) +
                QString ( " (%1 " + tr ( "users" ) + ")" ).arg ( iNumClients ) );
        }
    }

#if defined ( __APPLE__ ) || defined ( __MACOSX )
    // for MacOS only we show the number of connected clients as a
    // badge label text if more than one user is connected
    // (only available in Qt5.2)
# if QT_VERSION >= QT_VERSION_CHECK(5, 2, 0)
    if ( iNumClients > 1 )
    {
        // show the number of connected clients
        QtMac::setBadgeLabelText ( QString ( "%1" ).arg ( iNumClients ) );
    }
    else
    {
        // clear the text (apply an empty string)
        QtMac::setBadgeLabelText ( "" );
    }
# endif
#endif
}

void CClientDlg::ShowConnectionSetupDialog()
{
    // init the connect dialog
    ConnectDlg.Init ( pClient->vstrIPAddress );
    ConnectDlg.SetCentralServerAddress ( NetworkUtil::GetCentralServerAddress ( pClient->GetCentralServerAddressType(),
                                                                                pClient->GetServerListCentralServerAddress() ) );

    // show connect dialog
    bConnectDlgWasShown = true;
    ConnectDlg.show();

    // make sure dialog is upfront and has focus
    ConnectDlg.raise();
    ConnectDlg.activateWindow();
}

void CClientDlg::ShowMusicianProfileDialog()
{
    // show musician profile dialog
    MusicianProfileDlg.show();

    // make sure dialog is upfront and has focus
    MusicianProfileDlg.raise();
    MusicianProfileDlg.activateWindow();
}

void CClientDlg::ShowGeneralSettings()
{
    // open general settings dialog
    ClientSettingsDlg.show();

    // make sure dialog is upfront and has focus
    ClientSettingsDlg.raise();
    ClientSettingsDlg.activateWindow();
}

void CClientDlg::ShowChatWindow ( const bool bForceRaise )
{
    // open chat dialog if it is not visible
    if ( bForceRaise || !ChatDlg.isVisible() )
    {
        ChatDlg.show();

        // make sure dialog is upfront and has focus
        ChatDlg.raise();
        ChatDlg.activateWindow();
    }

    UpdateDisplay();
}

void CClientDlg::ShowAnalyzerConsole()
{
    // open analyzer console dialog
    AnalyzerConsole.show();

    // make sure dialog is upfront and has focus
    AnalyzerConsole.raise();
    AnalyzerConsole.activateWindow();
}

void CClientDlg::OnSettingsStateChanged ( int value )
{
    if ( value == Qt::Checked )
    {
        ShowGeneralSettings();
    }
    else
    {
        ClientSettingsDlg.hide();
    }
}

void CClientDlg::OnChatStateChanged ( int value )
{
    if ( value == Qt::Checked )
    {
        ShowChatWindow();
    }
    else
    {
        ChatDlg.hide();
    }
}

void CClientDlg::OnLocalMuteStateChanged ( int value )
{
    pClient->SetMuteOutStream ( value == Qt::Checked );
}

void CClientDlg::OnTimerSigMet()
{
    // get current input levels
    double dCurSigLeveldB_L = pClient->MicLeveldB_L();
    double dCurSigLeveldB_R = pClient->MicLeveldB_R();

    // linear transformation of the input level range to the progress-bar range
    dCurSigLeveldB_L -= LOW_BOUND_SIG_METER;
    dCurSigLeveldB_L *= NUM_STEPS_LED_BAR / ( UPPER_BOUND_SIG_METER - LOW_BOUND_SIG_METER );
    dCurSigLeveldB_R -= LOW_BOUND_SIG_METER;
    dCurSigLeveldB_R *= NUM_STEPS_LED_BAR / ( UPPER_BOUND_SIG_METER - LOW_BOUND_SIG_METER );

    // lower bound the signal
    if ( dCurSigLeveldB_L < 0 )
    {
        dCurSigLeveldB_L = 0;
    }
    if ( dCurSigLeveldB_R < 0 )
    {
        dCurSigLeveldB_R = 0;
    }

    // show current level
    lbrInputLevelL->setValue ( dCurSigLeveldB_L );
    lbrInputLevelR->setValue ( dCurSigLeveldB_R );
}

void CClientDlg::OnTimerBuffersLED()
{
    CMultiColorLED::ELightColor eCurStatus;

    // get and reset current buffer state and set LED from that flag
    if ( pClient->GetAndResetbJitterBufferOKFlag() )
    {
        eCurStatus = CMultiColorLED::RL_GREEN;
    }
    else
    {
        eCurStatus = CMultiColorLED::RL_RED;
    }

    // update the buffer LED and the general settings dialog, too
    ledBuffers->SetLight ( eCurStatus );
    ClientSettingsDlg.SetStatus ( eCurStatus );
}

void CClientDlg::OnTimerPing()
{
    // send ping message to the server
    pClient->CreateCLPingMes();
}

void CClientDlg::OnPingTimeResult ( int iPingTime )
{
    // calculate overall delay
    const int iOverallDelayMs = pClient->EstimatedOverallDelay ( iPingTime );

    // color definition: <= 43 ms green, <= 68 ms yellow, otherwise red
    CMultiColorLED::ELightColor eOverallDelayLEDColor;

    if ( iOverallDelayMs <= 43 )
    {
        eOverallDelayLEDColor = CMultiColorLED::RL_GREEN;
    }
    else
    {
        if ( iOverallDelayMs <= 68 )
        {
            eOverallDelayLEDColor = CMultiColorLED::RL_YELLOW;
        }
        else
        {
            eOverallDelayLEDColor = CMultiColorLED::RL_RED;
        }
    }

    // only update delay information on settings dialog if it is visible to
    // avoid CPU load on working thread if not necessary
    if ( ClientSettingsDlg.isVisible() )
    {
        // set ping time result to general settings dialog
        ClientSettingsDlg.SetPingTimeResult ( iPingTime,
                                              iOverallDelayMs,
                                              eOverallDelayLEDColor );
    }

    // update delay LED on the main window
    ledDelay->SetLight ( eOverallDelayLEDColor );
}

void CClientDlg::OnCLPingTimeWithNumClientsReceived ( CHostAddress InetAddr,
                                                      int          iPingTime,
                                                      int          iNumClients )
{
    // update connection dialog server list
    ConnectDlg.SetPingTimeAndNumClientsResult ( InetAddr,
                                                iPingTime,
                                                iNumClients );
}

void CClientDlg::Connect ( const QString& strSelectedAddress,
                           const QString& strMixerBoardLabel )
{
    // set address and check if address is valid
    if ( pClient->SetServerAddr ( strSelectedAddress ) )
    {
        // try to start client, if error occurred, do not go in
        // running state but show error message
        try
        {
            if ( !pClient->IsRunning() )
            {
                pClient->Start();
            }
        }

        catch ( CGenErr generr )
        {
            // show error message and return the function
            QMessageBox::critical ( this, APP_NAME, generr.GetErrorText(), "Close", nullptr );
            return;
        }

        // change connect button text to "disconnect"
        butConnect->setText ( tr ( "D&isconnect" ) );

        // set server name in audio mixer group box title
        MainMixerBoard->SetServerName ( strMixerBoardLabel );

        // start timer for level meter bar and ping time measurement
        TimerSigMet.start ( LEVELMETER_UPDATE_TIME_MS );
        TimerBuffersLED.start ( BUFFER_LED_UPDATE_TIME_MS );
        TimerPing.start ( PING_UPDATE_TIME_MS );
    }
}

void CClientDlg::Disconnect()
{
    // only stop client if currently running, in case we received
    // the stopped message, the client is already stopped but the
    // connect/disconnect button and other GUI controls must be
    // updated
    if ( pClient->IsRunning() )
    {
        pClient->Stop();
    }

    // change connect button text to "connect"
    butConnect->setText ( tr ( "C&onnect" ) );

    // reset server name in audio mixer group box title
    MainMixerBoard->SetServerName ( "" );

    // stop timer for level meter bars and reset them
    TimerSigMet.stop();
    lbrInputLevelL->setValue ( 0 );
    lbrInputLevelR->setValue ( 0 );

    // stop other timers
    TimerBuffersLED.stop();
    TimerPing.stop();


// TODO is this still required???
// immediately update status bar
OnTimerStatus();


    // reset LEDs
    ledBuffers->Reset();
    ledDelay->Reset();
    ClientSettingsDlg.ResetStatusAndPingLED();

    // clear mixer board (remove all faders)
    MainMixerBoard->HideAll();
}

void CClientDlg::UpdateDisplay()
{
    // update settings/chat buttons (do not fire signals since it is an update)
    if ( chbSettings->isChecked() && !ClientSettingsDlg.isVisible() )
    {
        chbSettings->blockSignals ( true );
        chbSettings->setChecked   ( false );
        chbSettings->blockSignals ( false );
    }
    if ( !chbSettings->isChecked() && ClientSettingsDlg.isVisible() )
    {
        chbSettings->blockSignals ( true );
        chbSettings->setChecked   ( true );
        chbSettings->blockSignals ( false );
    }

    if ( chbChat->isChecked() && !ChatDlg.isVisible() )
    {
        chbChat->blockSignals ( true );
        chbChat->setChecked   ( false );
        chbChat->blockSignals ( false );
    }
    if ( !chbChat->isChecked() && ChatDlg.isVisible() )
    {
        chbChat->blockSignals ( true );
        chbChat->setChecked   ( true );
        chbChat->blockSignals ( false );
    }
}

void CClientDlg::SetGUIDesign ( const EGUIDesign eNewDesign )
{
    // apply GUI design to current window
    switch ( eNewDesign )
    {
    case GD_ORIGINAL:
        backgroundFrame->setStyleSheet (
            "QFrame#backgroundFrame { border-image:  url(:/png/fader/res/mixerboardbackground.png) 34px 30px 40px 40px;"
            "                         border-top:    34px transparent;"
            "                         border-bottom: 40px transparent;"
            "                         border-left:   30px transparent;"
            "                         border-right:  40px transparent;"
            "                         padding:       -5px;"
            "                         margin:        -5px, -5px, 0px, 0px; }"
            "QLabel {                 color:          rgb(220, 220, 220);"
            "                         font:           bold; }"
            "QRadioButton {           color:          rgb(220, 220, 220);"
            "                         font:           bold; }"
            "QScrollArea {            background:     transparent; }"
            ".QWidget {               background:     transparent; }" // note: matches instances of QWidget, but not of its subclasses
            "QGroupBox {              background:     transparent; }"
            "QGroupBox::title {       color:          rgb(220, 220, 220); }"
            "QCheckBox::indicator {   width:          38px;"
            "                         height:         21px; }"
            "QCheckBox::indicator:unchecked {"
            "                         image:          url(:/png/fader/res/ledbuttonnotpressed.png); }"
            "QCheckBox::indicator:checked {"
            "                         image:          url(:/png/fader/res/ledbuttonpressed.png); }"
            "QCheckBox {              color:          rgb(220, 220, 220);"
            "                         font:           bold; }" );            

#ifdef _WIN32
// Workaround QT-Windows problem: This should not be necessary since in the
// background frame the style sheet for QRadioButton was already set. But it
// seems that it is only applied if the style was set to default and then back
// to GD_ORIGINAL. This seems to be a QT related issue...
rbtReverbSelL->setStyleSheet ( "color: rgb(220, 220, 220);"
                               "font:  bold;" );
rbtReverbSelR->setStyleSheet ( "color: rgb(220, 220, 220);"
                               "font:  bold;" );
#endif

        lbrInputLevelL->SetLevelMeterType ( CMultiColorLEDBar::MT_LED );
        lbrInputLevelR->SetLevelMeterType ( CMultiColorLEDBar::MT_LED );
        break;

    default:
        // reset style sheet and set original paramters
        backgroundFrame->setStyleSheet ( "" );

#ifdef _WIN32
// Workaround QT-Windows problem: See above description
rbtReverbSelL->setStyleSheet ( "" );
rbtReverbSelR->setStyleSheet ( "" );
#endif

        lbrInputLevelL->SetLevelMeterType ( CMultiColorLEDBar::MT_BAR );
        lbrInputLevelR->SetLevelMeterType ( CMultiColorLEDBar::MT_BAR );
        break;
    }

    // also apply GUI design to child GUI controls
    MainMixerBoard->SetGUIDesign ( eNewDesign );
}