///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 F4EXB                                                      //
// written by Edouard Griffiths                                                  //
//                                                                               //
// OpenGL interface modernization.                                               //
// See: http://doc.qt.io/qt-5/qopenglshaderprogram.html                          //
//                                                                               //
// 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 as version 3 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 V3 for more details.                               //
//                                                                               //
// You should have received a copy of the GNU General Public License             //
// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
///////////////////////////////////////////////////////////////////////////////////

#ifndef INCLUDE_GLSPECTRUM_H
#define INCLUDE_GLSPECTRUM_H

#include <QTimer>
#include <QMutex>
#include <QOpenGLBuffer>
#include <QOpenGLVertexArrayObject>
#include <QMatrix4x4>
#include <QGLWidget>
#include "gui/scaleengine.h"
#include "gui/glshadersimple.h"
#include "gui/glshadertextured.h"
#include "dsp/glspectruminterface.h"
#include "dsp/spectrummarkers.h"
#include "dsp/channelmarker.h"
#include "dsp/spectrumsettings.h"
#include "export.h"
#include "util/incrementalarray.h"
#include "util/message.h"

class QOpenGLShaderProgram;
class MessageQueue;
class SpectrumVis;

class SDRGUI_API GLSpectrum : public QGLWidget, public GLSpectrumInterface {
    Q_OBJECT

public:
    class MsgReportSampleRate : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        MsgReportSampleRate(quint32 sampleRate) :
            Message(),
            m_sampleRate(sampleRate)
        {}

        quint32 getSampleRate() const { return m_sampleRate; }

    private:
        quint32 m_sampleRate;
    };

    class MsgReportWaterfallShare : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        MsgReportWaterfallShare(Real waterfallShare) :
            Message(),
            m_waterfallShare(waterfallShare)
        {}

        Real getWaterfallShare() const { return m_waterfallShare; }

    private:
        Real m_waterfallShare;
    };

    class MsgReportFFTOverlap : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        MsgReportFFTOverlap(int overlap) :
            Message(),
            m_overlap(overlap)
        {}

        int getOverlap() const { return m_overlap; }

    private:
        int m_overlap;
    };

    class MsgReportPowerScale : public Message {
        MESSAGE_CLASS_DECLARATION

    public:
        MsgReportPowerScale(int refLevel, int range) :
            Message(),
            m_refLevel(refLevel),
            m_range(range)
        {}

        Real getRefLevel() const { return m_refLevel; }
        Real getRange() const { return m_range; }

    private:
        Real m_refLevel;
        Real m_range;
    };

    GLSpectrum(QWidget* parent = nullptr);
    virtual ~GLSpectrum();

    void setCenterFrequency(qint64 frequency);
    qint64 getCenterFrequency() const { return m_centerFrequency; }
    float getPowerMax() const;
    float getTimeMax() const;
    void setSampleRate(qint32 sampleRate);
    void setTimingRate(qint32 timingRate);
    void setFFTOverlap(int overlap);
    void setReferenceLevel(Real referenceLevel);
    void setPowerRange(Real powerRange);
    void setDecay(int decay);
    void setDecayDivisor(int decayDivisor);
    void setHistoStroke(int stroke);
    void setDisplayWaterfall(bool display);
    void setSsbSpectrum(bool ssbSpectrum);
    void setLsbDisplay(bool lsbDisplay);
    void setInvertedWaterfall(bool inv);
    void setDisplayMaxHold(bool display);
    void setDisplayCurrent(bool display);
    void setDisplayHistogram(bool display);
    void setDisplayGrid(bool display);
    void setDisplayGridIntensity(int intensity);
    void setDisplayTraceIntensity(int intensity);
    void setLinear(bool linear);
    qint32 getSampleRate() const { return m_sampleRate; }

    void addChannelMarker(ChannelMarker* channelMarker);
    void removeChannelMarker(ChannelMarker* channelMarker);
    void setMessageQueueToGUI(MessageQueue* messageQueue) { m_messageQueueToGUI = messageQueue; }

    virtual void newSpectrum(const Real* spectrum, int nbBins, int fftSize);
    void clearSpectrumHistogram();

    Real getWaterfallShare() const { return m_waterfallShare; }
    void setWaterfallShare(Real waterfallShare);
    void setFPSPeriodMs(int fpsPeriodMs);

    void setDisplayedStream(bool sourceOrSink, int streamIndex)
    {
        m_displaySourceOrSink = sourceOrSink;
        m_displayStreamIndex = streamIndex;
    }
    void setSpectrumVis(SpectrumVis *spectrumVis) { m_spectrumVis = spectrumVis; }
    const QList<SpectrumHistogramMarker>& getHistogramMarkers() const { return m_histogramMarkers; }
    QList<SpectrumHistogramMarker>& getHistogramMarkers() { return m_histogramMarkers; }
    void setHistogramMarkers(const QList<SpectrumHistogramMarker>& histogramMarkers);
    const QList<SpectrumWaterfallMarker>& getWaterfallMarkers() const { return m_waterfallMarkers; }
    QList<SpectrumWaterfallMarker>& getWaterfallMarkers() { return m_waterfallMarkers; }
    void setWaterfallMarkers(const QList<SpectrumWaterfallMarker>& waterfallMarkers);
    const QList<SpectrumAnnotationMarker>& getAnnotationMarkers() const { return m_annotationMarkers; }
    QList<SpectrumAnnotationMarker>& getAnnotationMarkers() { return m_annotationMarkers; }
    void setAnnotationMarkers(const QList<SpectrumAnnotationMarker>& annotationMarkers);
    void updateHistogramMarkers();
    void updateWaterfallMarkers();
    void updateAnnotationMarkers();
    void updateMarkersDisplay();
    void updateCalibrationPoints();
    SpectrumSettings::MarkersDisplay& getMarkersDisplay() {  return m_markersDisplay; }
	void setMarkersDisplay(SpectrumSettings::MarkersDisplay markersDisplay);

private:
    struct ChannelMarkerState {
        ChannelMarker* m_channelMarker;
        QMatrix4x4 m_glMatrixWaterfall;
        QMatrix4x4 m_glMatrixDsbWaterfall;
        QMatrix4x4 m_glMatrixFreqScale;
        QMatrix4x4 m_glMatrixDsbFreqScale;
        QMatrix4x4 m_glMatrixHistogram;
        QMatrix4x4 m_glMatrixDsbHistogram;
        QRect m_rect;

        ChannelMarkerState(ChannelMarker* channelMarker) :
            m_channelMarker(channelMarker)
        { }
    };
    QList<ChannelMarkerState*> m_channelMarkerStates;

    enum CursorState {
        CSNormal,
        CSSplitter,
        CSSplitterMoving,
        CSChannel,
        CSChannelMoving
    };

    QList<SpectrumHistogramMarker> m_histogramMarkers;
    QList<SpectrumWaterfallMarker> m_waterfallMarkers;
    QList<SpectrumAnnotationMarker> m_annotationMarkers;
    QList<SpectrumAnnotationMarker*> m_sortedAnnotationMarkers;
    QList<SpectrumAnnotationMarker*> m_visibleAnnotationMarkers;
    SpectrumSettings::MarkersDisplay m_markersDisplay;

    CursorState m_cursorState;
    int m_cursorChannel;

    SpectrumVis* m_spectrumVis;
    QTimer m_timer;
    int m_fpsPeriodMs;
    QMutex m_mutex;
    bool m_mouseInside;
    bool m_changesPending;

    qint64 m_centerFrequency;
    Real m_referenceLevel;
    Real m_powerRange;
    bool m_linear;
    int m_decay;
    quint32 m_sampleRate;
    quint32 m_timingRate;
    int m_fftOverlap;

    int m_fftSize; //!< FFT size in number of bins
    int m_nbBins;  //!< Number of visible FFT bins (zoom support)

    bool m_displayGrid;
    int m_displayGridIntensity;
    int m_displayTraceIntensity;
    bool m_invertedWaterfall;

    std::vector<Real> m_maxHold;
    bool m_displayMaxHold;
    const Real *m_currentSpectrum;
    bool m_displayCurrent;

    Real m_waterfallShare;

    int m_leftMargin;
    int m_rightMargin;
    int m_topMargin;
    int m_frequencyScaleHeight;
    int m_infoHeight;
    int m_histogramHeight;
    int m_waterfallHeight;
    int m_bottomMargin;
    QFont m_textOverlayFont;
    QPixmap m_leftMarginPixmap;
    QPixmap m_frequencyPixmap;
    QPixmap m_infoPixmap;
    ScaleEngine m_timeScale;
    ScaleEngine m_powerScale;
    ScaleEngine m_frequencyScale;
    QRectF m_histogramRect;
    QRect m_frequencyScaleRect;
    QRectF m_waterfallRect;
    QRect m_infoRect;
    QMatrix4x4 m_glFrequencyScaleBoxMatrix;
    QMatrix4x4 m_glLeftScaleBoxMatrix;
    QMatrix4x4 m_glInfoBoxMatrix;

    QRgb m_waterfallPalette[240];
    QImage* m_waterfallBuffer;
    int m_waterfallBufferPos;
    int m_waterfallTextureHeight;
    int m_waterfallTexturePos;
    QMatrix4x4 m_glWaterfallBoxMatrix;
    bool m_displayWaterfall;
    bool m_ssbSpectrum;
    bool m_lsbDisplay;

    QRgb m_histogramPalette[240];
    QImage* m_histogramBuffer;
    quint8* m_histogram; //!< Spectrum phosphor matrix of FFT width and PSD height scaled to 100. values [0..239]
    int m_decayDivisor;
    int m_decayDivisorCount;
    int m_histogramStroke;
    QMatrix4x4 m_glHistogramSpectrumMatrix;
    QMatrix4x4 m_glHistogramBoxMatrix;
    bool m_displayHistogram;
    bool m_displayChanged;
    bool m_displaySourceOrSink;
    int m_displayStreamIndex;
    float m_frequencyZoomFactor;
    float m_frequencyZoomPos;
    static const float m_maxFrequencyZoom;
    static const float m_annotationMarkerHeight;

    GLShaderSimple m_glShaderSimple;
    GLShaderTextured m_glShaderLeftScale;
    GLShaderTextured m_glShaderFrequencyScale;
    GLShaderTextured m_glShaderWaterfall;
    GLShaderTextured m_glShaderHistogram;
    GLShaderTextured m_glShaderTextOverlay;
    GLShaderTextured m_glShaderInfo;
    int m_matrixLoc;
    int m_colorLoc;
    IncrementalArray<GLfloat> m_q3TickTime;
    IncrementalArray<GLfloat> m_q3TickFrequency;
    IncrementalArray<GLfloat> m_q3TickPower;
    IncrementalArray<GLfloat> m_q3FFT;

    MessageQueue *m_messageQueueToGUI;

    void updateWaterfall(const Real *spectrum);
    void updateHistogram(const Real *spectrum);

    void initializeGL();
    void resizeGL(int width, int height);
    void paintGL();
    void drawSpectrumMarkers();
    void drawAnnotationMarkers();

    void stopDrag();
    void applyChanges();

    void mouseMoveEvent(QMouseEvent* event);
    void mousePressEvent(QMouseEvent* event);
    void mouseReleaseEvent(QMouseEvent* event);
    void wheelEvent(QWheelEvent*);
    void channelMarkerMove(QWheelEvent*, int mul);
    void zoom(QWheelEvent*);
    void frequencyZoom(float pw);
    void frequencyPan(QMouseEvent*);
    void timeZoom(bool zoomInElseOut);
    void powerZoom(float pw, bool zoomInElseOut);
    void resetFrequencyZoom();
    void updateFFTLimits();
    void setFrequencyScale();
    void getFrequencyZoom(int64_t& centerFrequency, int& frequencySpan);

    void enterEvent(QEvent* event);
    void leaveEvent(QEvent* event);

    QString displayScaled(int64_t value, char type, int precision, bool showMult);
    QString displayScaledF(float value, char type, int precision, bool showMult);
    int getPrecision(int value);
    void drawTextOverlay(      //!< Draws a text overlay
            const QString& text,
            const QColor& color,
            const QFont& font,
            float shiftX,
            float shiftY,
            bool leftHalf,
            bool topHalf,
            const QRectF& glRect);
    void formatTextInfo(QString& info);
    void updateSortedAnnotationMarkers();

    static bool annotationDisplayLessThan(const SpectrumAnnotationMarker *m1, const SpectrumAnnotationMarker *m2)
    {
        if (m1->m_bandwidth == m2->m_bandwidth) {
            return m1->m_startFrequency < m2->m_startFrequency;
        } else {
            return m1->m_bandwidth > m2->m_bandwidth; // larger bandwidths should come first for display (lower layer)
        }
    }

private slots:
    void cleanup();
    void tick();
    void channelMarkerChanged();
    void channelMarkerDestroyed(QObject* object);
};

#endif // INCLUDE_GLSPECTRUM_H