/******************************************************************************\
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 *
\******************************************************************************/

#pragma once

#include <QFrame>
#include <QScrollArea>
#include <QGroupBox>
#include <QLabel>
#include <QCheckBox>
#include <QLayout>
#include <QString>
#include <QSlider>
#include <QDial>
#include <QSizePolicy>
#include <QHostAddress>
#include <QListWidget>
#include <QMenu>
#include "global.h"
#include "util.h"
#include "levelmeter.h"
#include "settings.h"


/* Classes ********************************************************************/
class CChannelFader : public QObject
{
    Q_OBJECT

public:
    CChannelFader ( QWidget* pNW );

    QString GetReceivedName() { return cReceivedChanInfo.strName; }
    int     GetReceivedInstrument() { return cReceivedChanInfo.iInstrument; }
    void    SetChannelInfos ( const CChannelInfo& cChanInfo );
    void    Show() { pFrame->show(); }
    void    Hide() { pFrame->hide(); }
    bool    IsVisible() { return !pFrame->isHidden(); }
    bool    IsSolo() { return pcbSolo->isChecked(); }
    bool    IsMute() { return pcbMute->isChecked(); }
    int     GetGroupID() { return iGroupID; }
    void    SetGUIDesign ( const EGUIDesign eNewDesign );
    void    SetDisplayChannelLevel ( const bool eNDCL );
    bool    GetDisplayChannelLevel();
    void    SetDisplayPans ( const bool eNDP );
    QFrame* GetMainWidget() { return pFrame; }

    void SetPanValue ( const int iPan );
    void SetFaderIsSolo ( const bool bIsSolo );
    void SetFaderIsMute ( const bool bIsMute );
    void SetGroupID ( const int iNGroupID );
    void SetRemoteFaderIsMute ( const bool bIsMute );
    void SetFaderLevel ( const double dLevel,
                         const bool   bIsGroupUpdate = false );

    int    GetFaderLevel() { return pFader->value(); }
    double GetPreviousFaderLevel() { return dPreviousFaderLevel; }
    int    GetPanValue() { return pPan->value(); }
    void   Reset();
    void   SetChannelLevel ( const uint16_t iLevel );
    void   SetIsMyOwnFader() { bIsMyOwnFader = true; }
    void   UpdateSoloState ( const bool bNewOtherSoloState );

protected:
    void   UpdateGroupIDDependencies();
    void   SetMute ( const bool bState );
    void   SetupFaderTag ( const ESkillLevel eSkillLevel );
    void   SendPanValueToServer ( const int iPan );
    void   SendFaderLevelToServer ( const double dLevel,
                                    const bool   bIsGroupUpdate );

    QFrame*      pFrame;

    QWidget*     pLevelsBox;
    QWidget*     pMuteSoloBox;
    CLevelMeter* plbrChannelLevel;
    QSlider*     pFader;
    QDial*       pPan;
    QLabel*      pPanLabel;
    QLabel*      pInfoLabel;
    QHBoxLayout* pLabelGrid;
    QVBoxLayout* pLabelPictGrid;

    QCheckBox*   pcbMute;
    QCheckBox*   pcbSolo;
    QCheckBox*   pcbGroup;
    QMenu*       pGroupPopupMenu;

    QGroupBox*   pLabelInstBox;
    QLabel*      plblLabel;
    QLabel*      plblInstrument;
    QLabel*      plblCountryFlag;

    CChannelInfo cReceivedChanInfo;

    bool         bOtherChannelIsSolo;
    bool         bIsMyOwnFader;
    double       dPreviousFaderLevel;
    int          iGroupID;
    QString      strGroupBaseText;
    int          iInstrPicMaxWidth;
    EGUIDesign   eDesign;

public slots:
    void OnLevelValueChanged ( int value ) { SendFaderLevelToServer ( value, false ); }
    void OnPanValueChanged ( int value ) { SendPanValueToServer ( value ); }
    void OnMuteStateChanged ( int value );
    void OnGroupStateChanged ( int );

    void OnGroupMenuGrpNone() { SetGroupID ( INVALID_INDEX ); }
    void OnGroupMenuGrp1()    { SetGroupID ( 0 ); }
    void OnGroupMenuGrp2()    { SetGroupID ( 1 ); }
    void OnGroupMenuGrp3()    { SetGroupID ( 2 ); }
    void OnGroupMenuGrp4()    { SetGroupID ( 3 ); }

signals:
    void gainValueChanged ( double value,
                            bool   bIsMyOwnFader,
                            bool   bIsGroupUpdate,
                            bool   bSuppressServerUpdate,
                            double dLevelRatio );

    void panValueChanged  ( double value );
    void soloStateChanged ( int value );
};

template<unsigned int slotId>
class CAudioMixerBoardSlots : public CAudioMixerBoardSlots<slotId - 1>
{
public:
    void OnChGainValueChanged ( double dValue,
                                bool   bIsMyOwnFader,
                                bool   bIsGroupUpdate,
                                bool   bSuppressServerUpdate,
                                double dLevelRatio ) { UpdateGainValue ( slotId - 1,
                                                                         dValue,
                                                                         bIsMyOwnFader,
                                                                         bIsGroupUpdate,
                                                                         bSuppressServerUpdate,
                                                                         dLevelRatio ); }

    void OnChPanValueChanged ( double dValue ) { UpdatePanValue ( slotId - 1, dValue ); }

protected:
    virtual void UpdateGainValue ( const int    iChannelIdx,
                                   const double dValue,
                                   const bool   bIsMyOwnFader,
                                   const bool   bIsGroupUpdate,
                                   const bool   bSuppressServerUpdate,
                                   const double dLevelRatio ) = 0;

    virtual void UpdatePanValue ( const int    iChannelIdx,
                                  const double dValue ) = 0;
};

template<>
class CAudioMixerBoardSlots<0> {};


class CAudioMixerBoard :
    public QGroupBox,
    public CAudioMixerBoardSlots<MAX_NUM_CHANNELS>
{
    Q_OBJECT

public:
    CAudioMixerBoard ( QWidget*        parent = nullptr,
                       Qt::WindowFlags f      = nullptr );

    virtual ~CAudioMixerBoard();

    void SetSettingsPointer ( CClientSettings* pNSet ) { pSettings = pNSet; }
    void HideAll();
    void ApplyNewConClientList ( CVector<CChannelInfo>& vecChanInfo );
    void SetServerName ( const QString& strNewServerName );
    void SetGUIDesign ( const EGUIDesign eNewDesign );
    void SetDisplayChannelLevels ( const bool eNDCL );
    void SetDisplayPans ( const bool eNDP );
    void SetPanIsSupported();
    void SetRemoteFaderIsMute ( const int iChannelIdx, const bool bIsMute );
    void SetMyChannelID ( const int iChannelIdx ) { iMyChannelID = iChannelIdx; }

    void SetFaderLevel ( const int iChannelIdx,
                         const int iValue );

    void ChangeFaderOrder ( const bool        bDoSort,
                            const EChSortType eChSortType );

    void SetChannelLevels ( const CVector<uint16_t>& vecChannelLevel );

    void SetRecorderState ( const ERecorderState newRecorderState );

protected:
    class CMixerBoardScrollArea : public QScrollArea
    {
    public:
        CMixerBoardScrollArea ( QWidget* parent = nullptr ) : QScrollArea ( parent ) {}

    protected:
        virtual void resizeEvent ( QResizeEvent* event )
        {
            // if after a resize of the main window a vertical scroll bar is required, make
            // sure that the fader label is visible (scroll down completely)
            ensureVisible ( 0, 2000 ); // use a large value here
            QScrollArea::resizeEvent ( event );
        }
    };

    bool GetStoredFaderSettings ( const CChannelInfo& ChanInfo,
                                  int&                iStoredFaderLevel,
                                  int&                iStoredPanValue,
                                  bool&               bStoredFaderIsSolo,
                                  bool&               bStoredFaderIsMute,
                                  int&                iGroupID );

    void StoreFaderSettings ( CChannelFader* pChanFader );
    void UpdateSoloStates();
    void UpdateTitle();

    void OnGainValueChanged ( const int    iChannelIdx,
                              const double dValue );

    CClientSettings*        pSettings;
    CVector<CChannelFader*> vecpChanFader;
    CMixerBoardScrollArea*  pScrollArea;
    QHBoxLayout*            pMainLayout;
    bool                    bDisplayChannelLevels;
    bool                    bDisplayPans;
    bool                    bIsPanSupported;
    bool                    bNoFaderVisible;
    int                     iMyChannelID;
    QString                 strServerName;
    ERecorderState          eRecorderState;

    virtual void UpdateGainValue ( const int    iChannelIdx,
                                   const double dValue,
                                   const bool   bIsMyOwnFader,
                                   const bool   bIsGroupUpdate,
                                   const bool   bSuppressServerUpdate,
                                   const double dLevelRatio );

    virtual void UpdatePanValue ( const int    iChannelIdx,
                                  const double dValue );

    template<unsigned int slotId>
    inline void connectFaderSignalsToMixerBoardSlots();

signals:
    void ChangeChanGain ( int iId, double dGain, bool bIsMyOwnFader );
    void ChangeChanPan ( int iId, double dPan );
    void NumClientsChanged ( int iNewNumClients );
};