/******************************************************************************\
 * 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 <QMutex>
#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; }
    QString GetReceivedCity() { return cReceivedChanInfo.strCity; }
    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   SetRunningNewClientCnt ( const int iNRunningNewClientCnt ) { iRunningNewClientCnt = iNRunningNewClientCnt; }
    int    GetRunningNewClientCnt() { return iRunningNewClientCnt; }
    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;
    bool       bIsMutedAtServer;
    double     dPreviousFaderLevel;
    int        iGroupID;
    QString    strGroupBaseText;
    int        iRunningNewClientCnt;
    int        iInstrPicMaxWidth;
    EGUIDesign eDesign;
    QPixmap    BitmapMutedIcon;

public slots:
    void OnLevelValueChanged ( int value )
    {
        SendFaderLevelToServer ( value,
                                 QGuiApplication::keyboardModifiers() ==
                                     Qt::ShiftModifier ); /* isolate a channel from the group temporarily with shift-click-drag (#695) */
    }

    void OnPanValueChanged ( int value );
    void OnMuteStateChanged ( int value );
    void OnGroupStateChanged ( int );

    void OnGroupMenuGrp ( int iGrp ) { SetGroupID ( iGrp ); }

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

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

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

    void OnChPanValueChanged ( float fValue ) { UpdatePanValue ( slotId - 1, fValue ); }

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

    virtual void UpdatePanValue ( const int iChannelIdx, const float fValue ) = 0;
};

template<>
class CAudioMixerBoardSlots<0>
{};

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

public:
    CAudioMixerBoard ( QWidget* parent = nullptr );

    virtual ~CAudioMixerBoard();

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

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

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

    void SetFaderIsSolo ( const int iChannelIdx, const bool bIsSolo );

    void SetFaderIsMute ( const int iChannelIdx, const bool bIsMute );

    void SetNumMixerPanelRows ( const int iNNumMixerPanelRows );
    int  GetNumMixerPanelRows() { return iNumMixerPanelRows; }

    void        SetFaderSorting ( const EChSortType eNChSortType );
    EChSortType GetFaderSorting() { return eChSortType; }

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

    void           SetRecorderState ( const ERecorderState newRecorderState );
    ERecorderState GetRecorderState() { return eRecorderState; };

    void SetAllFaderLevelsToNewClientLevel();
    void StoreAllFaderSettings();
    void LoadAllFaderSettings();
    void AutoAdjustAllFaderLevels();

    void MuteMyChannel();

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 );
        }
    };

    void ChangeFaderOrder ( const EChSortType eChSortType );

    bool GetStoredFaderSettings ( const QString& strName,
                                  int&           iStoredFaderLevel,
                                  int&           iStoredPanValue,
                                  bool&          bStoredFaderIsSolo,
                                  bool&          bStoredFaderIsMute,
                                  int&           iGroupID );

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

    CClientSettings*        pSettings;
    CVector<CChannelFader*> vecpChanFader;
    CMixerBoardScrollArea*  pScrollArea;
    QGridLayout*            pMainLayout;
    bool                    bDisplayPans;
    bool                    bIsPanSupported;
    bool                    bNoFaderVisible;
    int                     iMyChannelID;
    int                     iRunningNewClientCnt; // integer type is sufficient, will never overrun for its purpose
    int                     iNumMixerPanelRows;
    QString                 strServerName;
    ERecorderState          eRecorderState;
    QMutex                  Mutex;
    EChSortType             eChSortType;
    CVector<float>          vecAvgLevels;

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

    virtual void UpdatePanValue ( const int iChannelIdx, const float fValue );

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

signals:
    void ChangeChanGain ( int iId, float fGain, bool bIsMyOwnFader );
    void ChangeChanPan ( int iId, float fPan );
    void NumClientsChanged ( int iNewNumClients );
};
