//
// C++ Implementation: woverview
//
// Description:
//
//
// Author: Tue Haste Andersen <haste@diku.dk>, (C) 2003
//
// Copyright: See COPYING file that comes with this distribution
//
//

#include <QBrush>
#include <QtDebug>
#include <QMouseEvent>
#include <QPaintEvent>
#include <QPainter>
#include <QtDebug>
#include <QPixmap>
#include <QUrl>
#include <QMimeData>

#include "analyzer/analyzerprogress.h"
#include "control/controlobject.h"
#include "control/controlproxy.h"
#include "engine/engine.h"
#include "mixer/playermanager.h"
#include "track/track.h"
#include "util/color/color.h"
#include "util/compatibility.h"
#include "util/dnd.h"
#include "util/duration.h"
#include "util/math.h"
#include "util/painterscope.h"
#include "util/timer.h"
#include "widget/controlwidgetconnection.h"
#include "woverview.h"
#include "wskincolor.h"

#include "waveform/waveform.h"
#include "waveform/waveformwidgetfactory.h"

WOverview::WOverview(
        const char* group,
        PlayerManager* pPlayerManager,
        UserSettingsPointer pConfig,
        QWidget* parent)
        : WWidget(parent),
          m_actualCompletion(0),
          m_pixmapDone(false),
          m_waveformPeak(-1.0),
          m_diffGain(0),
          m_devicePixelRatio(1.0),
          m_group(group),
          m_pConfig(pConfig),
          m_endOfTrack(false),
          m_pCueMenuPopup(std::make_unique<WCueMenuPopup>(this)),
          m_bShowCueTimes(true),
          m_iPosSeconds(0),
          m_bLeftClickDragging(false),
          m_iPickupPos(0),
          m_iPlayPos(0),
          m_pHoveredMark(nullptr),
          m_bHotcueMenuShowing(false),
          m_bTimeRulerActive(false),
          m_orientation(Qt::Horizontal),
          m_iLabelFontSize(10),
          m_a(1.0),
          m_b(0.0),
          m_analyzerProgress(kAnalyzerProgressUnknown),
          m_trackLoaded(false),
          m_scaleFactor(1.0) {
    m_endOfTrackControl = new ControlProxy(
            m_group, "end_of_track", this);
    m_endOfTrackControl->connectValueChanged(this, &WOverview::onEndOfTrackChange);
    m_pRateRatioControl = new ControlProxy(m_group, "rate_ratio", this);
    // Needed to recalculate range durations when rate slider is moved without the deck playing
    m_pRateRatioControl->connectValueChanged(this, &WOverview::onRateRatioChange);
    m_trackSampleRateControl = new ControlProxy(m_group, "track_samplerate", this);
    m_trackSamplesControl =
            new ControlProxy(m_group, "track_samples", this);
    m_playpositionControl = new ControlProxy(m_group, "playposition", this);
    setAcceptDrops(true);

    setMouseTracking(true);

    connect(pPlayerManager, &PlayerManager::trackAnalyzerProgress,
            this, &WOverview::onTrackAnalyzerProgress);

    connect(m_pCueMenuPopup.get(), &WCueMenuPopup::aboutToHide, this, &WOverview::slotCueMenuPopupAboutToHide);
}

void WOverview::setup(const QDomNode& node, const SkinContext& context) {
    m_scaleFactor = context.getScaleFactor();
    m_signalColors.setup(node, context);

    m_qColorBackground = m_signalColors.getBgColor();

    m_labelBackgroundColor = context.selectColor(node, "LabelBackgroundColor");
    if (!m_labelBackgroundColor.isValid()) {
        m_labelBackgroundColor = m_qColorBackground;
        m_labelBackgroundColor.setAlpha(255 / 2); // 0 == fully transparent
    }

    m_labelTextColor = context.selectColor(node, "LabelTextColor");
    if (!m_labelTextColor.isValid()) {
        m_labelTextColor = Qt::white;
    }

    bool okay = false;
    int labelFontSize = context.selectInt(node, "LabelFontSize", &okay);
    if (okay) {
        m_iLabelFontSize = labelFontSize;
    }

    // Clear the background pixmap, if it exists.
    m_backgroundPixmap = QPixmap();
    m_backgroundPixmapPath = context.selectString(node, "BgPixmap");
    if (!m_backgroundPixmapPath.isEmpty()) {
        m_backgroundPixmap = *WPixmapStore::getPixmapNoCache(
                context.makeSkinPath(m_backgroundPixmapPath),
                m_scaleFactor);
    }

    m_endOfTrackColor = QColor(200, 25, 20);
    const QString endOfTrackColorName = context.selectString(node, "EndOfTrackColor");
    if (!endOfTrackColorName.isNull()) {
        m_endOfTrackColor.setNamedColor(endOfTrackColorName);
        m_endOfTrackColor = WSkinColor::getCorrectColor(m_endOfTrackColor);
    }

    // setup hotcues and cue and loop(s)
    m_marks.setup(m_group, node, context, m_signalColors);
    WaveformMarkPointer defaultMark(m_marks.getDefaultMark());
    QColor defaultColor = defaultMark
            ? defaultMark->fillColor()
            : m_signalColors.getAxesColor();
    m_predefinedColorsRepresentation = context.getCueColorRepresentation(node, defaultColor);
    m_pCueMenuPopup->useColorSet(&m_predefinedColorsRepresentation);

    for (const auto& pMark: m_marks) {
        if (pMark->isValid()) {
            pMark->connectSamplePositionChanged(this,
                    &WOverview::onMarkChanged);
        }
        if (pMark->hasVisible()) {
            pMark->connectVisibleChanged(this,
                    &WOverview::onMarkChanged);
        }
    }

    QDomNode child = node.firstChild();
    while (!child.isNull()) {
        if (child.nodeName() == "MarkRange") {
            m_markRanges.push_back(WaveformMarkRange(m_group, child, context, m_signalColors));
            WaveformMarkRange& markRange = m_markRanges.back();

            if (markRange.m_markEnabledControl) {
                markRange.m_markEnabledControl->connectValueChanged(
                        this, &WOverview::onMarkRangeChange);
            }
            if (markRange.m_markVisibleControl) {
                markRange.m_markVisibleControl->connectValueChanged(
                        this, &WOverview::onMarkRangeChange);
            }
            if (markRange.m_markStartPointControl) {
                markRange.m_markStartPointControl->connectValueChanged(
                        this, &WOverview::onMarkRangeChange);
            }
            if (markRange.m_markEndPointControl) {
                markRange.m_markEndPointControl->connectValueChanged(
                        this, &WOverview::onMarkRangeChange);
            }
        }
        child = child.nextSibling();
    }

    QString orientationString = context.selectString(node, "Orientation").toLower();
    if (orientationString == "vertical") {
        m_orientation = Qt::Vertical;
    } else {
        m_orientation = Qt::Horizontal;
    }

    m_bShowCueTimes = context.selectBool(node, "ShowCueTimes", true);

    //qDebug() << "WOverview : m_marks" << m_marks.size();
    //qDebug() << "WOverview : m_markRanges" << m_markRanges.size();
    if (!m_connections.isEmpty()) {
        ControlParameterWidgetConnection* defaultConnection = m_connections.at(0);
        if (defaultConnection) {
            if (defaultConnection->getEmitOption() &
                    ControlParameterWidgetConnection::EMIT_DEFAULT) {
                // ON_PRESS means here value change on mouse move during press
                defaultConnection->setEmitOption(
                        ControlParameterWidgetConnection::EMIT_ON_RELEASE);
            }
        }
    }

    setFocusPolicy(Qt::NoFocus);
}

void WOverview::onConnectedControlChanged(double dParameter, double dValue) {
    // this is connected via skin to "playposition"
    Q_UNUSED(dValue);

    // Calculate handle position. Clamp the value within 0-1 because that's
    // all we represent with this widget.
    dParameter = math_clamp(dParameter, 0.0, 1.0);

    bool redraw = false;
    int oldPos = m_iPlayPos;
    m_iPlayPos = valueToPosition(dParameter);
    if (oldPos != m_iPlayPos) {
        redraw = true;
    }

    if (!m_bLeftClickDragging) {
        // if not dragged the pick-up moves with the play position
        m_iPickupPos = m_iPlayPos;
    }

    // In case the user is hovering a cue point or holding right click, the
    // calculated time between the playhead and cue/cursor should be updated at
    // least once per second, regardless of m_iPos which depends on the length
    // of the widget.
    int oldPositionSeconds = m_iPosSeconds;
    m_iPosSeconds = static_cast<int>(dParameter * m_trackSamplesControl->get());
    if ((m_bTimeRulerActive || m_pHoveredMark != nullptr) && oldPositionSeconds != m_iPosSeconds) {
        redraw = true;
    }

    if (redraw) {
        update();
    }
}

void WOverview::slotWaveformSummaryUpdated() {
    //qDebug() << "WOverview::slotWaveformSummaryUpdated()";
    TrackPointer pTrack(m_pCurrentTrack);
    if (!pTrack) {
        return;
    }
    m_pWaveform = pTrack->getWaveformSummary();
    if (m_pWaveform) {
        // If the waveform is already complete, just draw it.
        if (m_pWaveform->getCompletion() == m_pWaveform->getDataSize()) {
            m_actualCompletion = 0;
            if (drawNextPixmapPart()) {
                update();
            }
        }
    } else {
        // Null waveform pointer means waveform was cleared.
        m_waveformSourceImage = QImage();
        m_analyzerProgress = kAnalyzerProgressUnknown;
        m_actualCompletion = 0;
        m_waveformPeak = -1.0;
        m_pixmapDone = false;

        update();
    }
}

void WOverview::onTrackAnalyzerProgress(TrackId trackId, AnalyzerProgress analyzerProgress) {
    if (!m_pCurrentTrack || (m_pCurrentTrack->getId() != trackId)) {
        return;
    }

    bool updateNeeded = drawNextPixmapPart();
    if (updateNeeded || (m_analyzerProgress != analyzerProgress)) {
        m_analyzerProgress = analyzerProgress;
        update();
    }
}

void WOverview::slotTrackLoaded(TrackPointer pTrack) {
    Q_UNUSED(pTrack); // only used in DEBUG_ASSERT
    DEBUG_ASSERT(m_pCurrentTrack == pTrack);
    m_trackLoaded = true;
    if (m_pCurrentTrack) {
        updateCues(m_pCurrentTrack->getCuePoints());
    }
    update();
}

void WOverview::slotLoadingTrack(TrackPointer pNewTrack, TrackPointer pOldTrack) {
    Q_UNUSED(pOldTrack); // only used in DEBUG_ASSERT
    //qDebug() << this << "WOverview::slotLoadingTrack" << pNewTrack.get() << pOldTrack.get();
    DEBUG_ASSERT(m_pCurrentTrack == pOldTrack);
    if (m_pCurrentTrack != nullptr) {
        disconnect(m_pCurrentTrack.get(), SIGNAL(waveformSummaryUpdated()),
                   this, SLOT(slotWaveformSummaryUpdated()));
    }

    m_waveformSourceImage = QImage();
    m_analyzerProgress = kAnalyzerProgressUnknown;
    m_actualCompletion = 0;
    m_waveformPeak = -1.0;
    m_pixmapDone = false;
    m_trackLoaded = false;
    m_endOfTrack = false;

    if (pNewTrack) {
        m_pCurrentTrack = pNewTrack;
        m_pWaveform = pNewTrack->getWaveformSummary();

        connect(pNewTrack.get(), SIGNAL(waveformSummaryUpdated()),
                this, SLOT(slotWaveformSummaryUpdated()));
        slotWaveformSummaryUpdated();
        connect(pNewTrack.get(), SIGNAL(cuesUpdated()),
                this, SLOT(receiveCuesUpdated()));
    } else {
        m_pCurrentTrack.reset();
        m_pWaveform.clear();
    }
    update();
}

void WOverview::onEndOfTrackChange(double v) {
    //qDebug() << "WOverview::onEndOfTrackChange()" << v;
    m_endOfTrack = v > 0.0;
    update();
}

void WOverview::onMarkChanged(double v) {
    Q_UNUSED(v);
    //qDebug() << "WOverview::onMarkChanged()" << v;
    if (m_pCurrentTrack) {
        updateCues(m_pCurrentTrack->getCuePoints());
        update();
    }
}

void WOverview::onMarkRangeChange(double v) {
    Q_UNUSED(v);
    //qDebug() << "WOverview::onMarkRangeChange()" << v;
    update();
}

void WOverview::onRateRatioChange(double v) {
    Q_UNUSED(v);
    update();
}

void WOverview::updateCues(const QList<CuePointer> &loadedCues) {
    m_marksToRender.clear();
    for (CuePointer currentCue: loadedCues) {
        const WaveformMarkPointer pMark = m_marks.getHotCueMark(currentCue->getHotCue());

        if (pMark != nullptr && pMark->isValid() && pMark->isVisible() && pMark->getSamplePosition() != Cue::kNoPosition) {
            QColor newColor = m_predefinedColorsRepresentation.representationFor(currentCue->getColor());
            if (newColor != pMark->fillColor() || newColor != pMark->m_textColor) {
                pMark->setBaseColor(newColor);
            }

            int hotcueNumber = currentCue->getHotCue();
            if (currentCue->getType() == Cue::Type::HotCue && hotcueNumber != Cue::kNoHotCue) {
                // Prepend the hotcue number to hotcues' labels
                QString newLabel = currentCue->getLabel();
                if (newLabel.isEmpty()) {
                    newLabel = QString::number(hotcueNumber + 1);
                } else {
                    newLabel = QString("%1: %2").arg(hotcueNumber + 1).arg(newLabel);
                }

                if (pMark->m_text != newLabel) {
                    pMark->m_text = newLabel;
                }
            }

            m_marksToRender.append(pMark);
        }
    }

    // The loop above only adds WaveformMarks for hotcues to m_marksToRender.
    for (const auto& pMark : m_marks) {
        if (!m_marksToRender.contains(pMark) && pMark->isValid() && pMark->getSamplePosition() != Cue::kNoPosition && pMark->isVisible()) {
            m_marksToRender.append(pMark);
        }
    }
    std::sort(m_marksToRender.begin(), m_marksToRender.end());
}

// connecting the tracks cuesUpdated and onMarkChanged is not possible
// due to the incompatible signatures. This is a "wrapper" workaround
void WOverview::receiveCuesUpdated() {
    onMarkChanged(0);
}

void WOverview::mouseMoveEvent(QMouseEvent* e) {
    if (m_bLeftClickDragging) {
        if (m_orientation == Qt::Horizontal) {
            m_iPickupPos = math_clamp(e->x(), 0, width() - 1);
        } else {
            m_iPickupPos = math_clamp(e->y(), 0, height() - 1);
        }
    }

    // Do not activate cue hovering while right click is held down and the
    // button down event was not on a cue.
    if (m_bTimeRulerActive) {
        // Prevent showing times beyond the boundaries of the track when the
        // cursor is dragged outside this widget before releasing right click.
        m_timeRulerPos.setX(math_clamp(e->pos().x(), 0, width()));
        m_timeRulerPos.setY(math_clamp(e->pos().y(), 0, height()));
        update();
        return;
    }

    m_pHoveredMark.clear();
    // Without some padding, the user would only have a single pixel width that
    // would count as hovering over the WaveformMark.
    float lineHoverPadding = 5.0;
    // Non-hotcue marks (intro/outro cues, main cue, loop in/out) are sorted
    // before hotcues in m_marksToRender so if there is a hotcue in the same
    // location, the hotcue gets rendered on top. When right clicking, the
    // the hotcue rendered on top must be assigned to m_pHoveredMark to show
    // the CueMenuPopup. To accomplish this, m_marksToRender is iterated in
    // reverse and the loop breaks as soon as m_pHoveredMark is set.
    for (int i = m_marksToRender.size() - 1; i >= 0; --i) {
        WaveformMarkPointer pMark = m_marksToRender.at(i);
        int hoveredPosition;
        if (m_orientation == Qt::Horizontal) {
            hoveredPosition = e->x();
        } else {
            hoveredPosition = e->y();
        }
        bool lineHovered =
                pMark->m_linePosition >= hoveredPosition - lineHoverPadding && pMark->m_linePosition <= hoveredPosition + lineHoverPadding;

        if (pMark->m_label.area().contains(e->pos()) || lineHovered) {
            m_pHoveredMark = pMark;
            break;
        }
    }

    //qDebug() << "WOverview::mouseMoveEvent" << e->pos() << m_iPos;
    update();
}

void WOverview::mouseReleaseEvent(QMouseEvent* e) {
    mouseMoveEvent(e);
    //qDebug() << "WOverview::mouseReleaseEvent" << e->pos() << m_iPos << ">>" << dValue;

    if (e->button() == Qt::LeftButton) {
        if (m_bLeftClickDragging) {
            m_iPlayPos = m_iPickupPos;
            double dValue = positionToValue(m_iPickupPos);
            setControlParameterUp(dValue);
            m_bLeftClickDragging = false;
        }
        m_bTimeRulerActive = false;
    } else if (e->button() == Qt::RightButton) {
        // Do not seek when releasing a right click. This is important to
        // prevent accidental seeking when trying to right click a hotcue.
        m_bTimeRulerActive = false;
    }
}

void WOverview::mousePressEvent(QMouseEvent* e) {
    //qDebug() << "WOverview::mousePressEvent" << e->pos();
    mouseMoveEvent(e);
    if (m_pCurrentTrack == nullptr) {
        return;
    }
    if (e->button() == Qt::LeftButton) {
        if (m_orientation == Qt::Horizontal) {
            m_iPickupPos = math_clamp(e->x(), 0, width() - 1);
        } else {
            m_iPickupPos = math_clamp(e->y(), 0, height() - 1);
        }

        double dValue = positionToValue(m_iPickupPos);
        if (m_pHoveredMark != nullptr) {
            dValue = m_pHoveredMark->getSamplePosition() / m_trackSamplesControl->get();
            m_iPickupPos = valueToPosition(dValue);
            setControlParameterUp(dValue);
            m_bLeftClickDragging = false;
        } else {
            m_bLeftClickDragging = true;
            m_bTimeRulerActive = true;
            m_timeRulerPos = e->pos();
        }
    } else if (e->button() == Qt::RightButton) {
        if (m_bLeftClickDragging) {
            m_iPickupPos = m_iPlayPos;
            m_bLeftClickDragging = false;
            m_bTimeRulerActive = false;
        } else if (m_pHoveredMark == nullptr) {
            m_bTimeRulerActive = true;
            m_timeRulerPos = e->pos();
        } else if (m_pHoveredMark->getHotCue() != Cue::kNoHotCue) {
            // Currently the only way WaveformMarks can be associated
            // with their respective Cue objects is by using the hotcue
            // number. If cues without assigned hotcue are drawn on
            // WOverview in the future, another way to associate
            // WaveformMarks with Cues will need to be implemented.
            CuePointer pHoveredCue;
            QList<CuePointer> cueList = m_pCurrentTrack->getCuePoints();
            for (const auto& pCue : cueList) {
                if (pCue->getHotCue() == m_pHoveredMark->getHotCue()) {
                    pHoveredCue = pCue;
                    break;
                }
            }
            if (pHoveredCue != nullptr) {
                m_pCueMenuPopup->setTrackAndCue(m_pCurrentTrack, pHoveredCue);
                m_pCueMenuPopup->popup(e->globalPos());
                m_bHotcueMenuShowing = true;
            }
        }
    }
}

void WOverview::slotCueMenuPopupAboutToHide() {
    m_bHotcueMenuShowing = false;
    m_pHoveredMark.clear();
    update();
}

void WOverview::leaveEvent(QEvent* pEvent) {
    Q_UNUSED(pEvent);
    if (!m_bHotcueMenuShowing) {
        m_pHoveredMark.clear();
    }
    m_bLeftClickDragging = false;
    m_bTimeRulerActive = false;
    update();
}

void WOverview::paintEvent(QPaintEvent* pEvent) {
    Q_UNUSED(pEvent);
    ScopedTimer t("WOverview::paintEvent");

    QPainter painter(this);
    painter.fillRect(rect(), m_qColorBackground);

    if (!m_backgroundPixmap.isNull()) {
        painter.drawPixmap(rect(), m_backgroundPixmap);
    }

    if (m_pCurrentTrack) {
        // Refer to util/ScopePainter.h to understand the semantics of
        // ScopePainter.
        drawEndOfTrackBackground(&painter);
        drawAxis(&painter);
        drawWaveformPixmap(&painter);
        drawEndOfTrackFrame(&painter);
        drawAnalyzerProgress(&painter);

        double trackSamples = m_trackSamplesControl->get();
        if (m_trackLoaded && trackSamples > 0) {
            const float offset = 1.0f;
            const float gain = static_cast<float>(length() - 2) / m_trackSamplesControl->get();

            drawRangeMarks(&painter, offset, gain);
            drawMarks(&painter, offset, gain);
            drawPickupPosition(&painter);
            drawTimeRuler(&painter);
            drawMarkLabels(&painter, offset, gain);
        }
    }
}
void WOverview::drawEndOfTrackBackground(QPainter* pPainter) {
    if (m_endOfTrack) {
        PainterScope painterScope(pPainter);
        pPainter->setOpacity(0.3);
        pPainter->setBrush(m_endOfTrackColor);
        pPainter->drawRect(rect().adjusted(1, 1, -2, -2));
    }
}

void WOverview::drawAxis(QPainter* pPainter) {
    PainterScope painterScope(pPainter);
    pPainter->setPen(QPen(m_signalColors.getAxesColor(), 1 * m_scaleFactor));
    if (m_orientation == Qt::Horizontal) {
        pPainter->drawLine(0, height() / 2, width(), height() / 2);
    } else {
        pPainter->drawLine(width() / 2, 0, width() / 2, height());
    }
}

void WOverview::drawWaveformPixmap(QPainter* pPainter) {
    WaveformWidgetFactory* widgetFactory = WaveformWidgetFactory::instance();
    if (!m_waveformSourceImage.isNull()) {
        PainterScope painterScope(pPainter);
        int diffGain;
        bool normalize = widgetFactory->isOverviewNormalized();
        if (normalize && m_pixmapDone && m_waveformPeak > 1) {
            diffGain = 255 - m_waveformPeak - 1;
        } else {
            const double visualGain = widgetFactory->getVisualGain(WaveformWidgetFactory::All);
            diffGain = 255.0 - 255.0 / visualGain;
        }

        if (m_diffGain != diffGain || m_waveformImageScaled.isNull()) {
            QRect sourceRect(0, diffGain, m_waveformSourceImage.width(), m_waveformSourceImage.height() - 2 * diffGain);
            QImage croppedImage = m_waveformSourceImage.copy(sourceRect);
            if (m_orientation == Qt::Vertical) {
                // Rotate pixmap
                croppedImage = croppedImage.transformed(QTransform(0, 1, 1, 0, 0, 0));
            }
            m_waveformImageScaled = croppedImage.scaled(size() * m_devicePixelRatio,
                    Qt::IgnoreAspectRatio,
                    Qt::SmoothTransformation);
            m_diffGain = diffGain;
        }

        pPainter->drawImage(rect(), m_waveformImageScaled);

        // Overlay the played part of the overview-waveform with a skin defined color
        QColor playedOverlayColor = m_signalColors.getPlayedOverlayColor();
        if (playedOverlayColor.alpha() > 0) {
            if (m_orientation == Qt::Vertical) {
                pPainter->fillRect(0, 0, m_waveformImageScaled.width(), m_iPlayPos, playedOverlayColor);
            } else {
                pPainter->fillRect(0, 0, m_iPlayPos, m_waveformImageScaled.height(), playedOverlayColor);
            }
        }
    }
    if (m_bLeftClickDragging) {
        PainterScope painterScope(pPainter);
        QLineF line;
        if (m_orientation == Qt::Horizontal) {
            line.setLine(m_iPlayPos, 0.0, m_iPlayPos, height());
        } else {
            line.setLine(0.0, m_iPlayPos, width(), m_iPlayPos);
        }
        pPainter->setPen(QPen(m_signalColors.getPlayPosColor(), 1 * m_scaleFactor));
        pPainter->setOpacity(0.5);
        pPainter->drawLine(line);
    }
}

void WOverview::drawEndOfTrackFrame(QPainter* pPainter) {
    if (m_endOfTrack) {
        PainterScope painterScope(pPainter);
        pPainter->setOpacity(0.8);
        pPainter->setPen(QPen(QBrush(m_endOfTrackColor), 1.5 * m_scaleFactor));
        pPainter->setBrush(QColor(0, 0, 0, 0));
        pPainter->drawRect(rect().adjusted(0, 0, -1, -1));
    }
}

void WOverview::drawAnalyzerProgress(QPainter* pPainter) {
    if ((m_analyzerProgress >= kAnalyzerProgressNone) &&
            (m_analyzerProgress < kAnalyzerProgressDone)) {
        PainterScope painterScope(pPainter);
        pPainter->setPen(QPen(m_signalColors.getAxesColor(), 3 * m_scaleFactor));

        if (m_analyzerProgress > kAnalyzerProgressNone) {
            if (m_orientation == Qt::Horizontal) {
                pPainter->drawLine(
                        width() * m_analyzerProgress,
                        height() / 2,
                        width(),
                        height() / 2);
            } else {
                pPainter->drawLine(
                        width() / 2,
                        height() * m_analyzerProgress,
                        width() / 2,
                        height());
            }
        }

        if (m_analyzerProgress <= kAnalyzerProgressHalf) { // remove text after progress by wf is recognizable
            if (m_trackLoaded) {
                //: Text on waveform overview when file is playable but no waveform is visible
                paintText(tr("Ready to play, analyzing .."), pPainter);
            } else {
                //: Text on waveform overview when file is cached from source
                paintText(tr("Loading track .."), pPainter);
            }
        } else if (m_analyzerProgress >= kAnalyzerProgressFinalizing) {
            //: Text on waveform overview during finalizing of waveform analysis
            paintText(tr("Finalizing .."), pPainter);
        }
    } else if (!m_trackLoaded) {
        // This happens if the track samples are not loaded, but we have
        // a cached track
        //: Text on waveform overview when file is cached from source
        paintText(tr("Loading track .."), pPainter);
    }
}

void WOverview::drawRangeMarks(QPainter* pPainter, const float& offset, const float& gain) {
    for (auto&& markRange : m_markRanges) {
        if (!markRange.active() || !markRange.visible()) {
            continue;
        }

        // Active mark ranges by definition have starts/ends that are not
        // disabled.
        const qreal startValue = markRange.start();
        const qreal endValue = markRange.end();

        const qreal startPosition = offset + startValue * gain;
        const qreal endPosition = offset + endValue * gain;

        if (startPosition < 0.0 && endPosition < 0.0) {
            continue;
        }

        PainterScope painterScope(pPainter);

        if (markRange.enabled()) {
            pPainter->setOpacity(0.4);
            pPainter->setPen(markRange.m_activeColor);
            pPainter->setBrush(markRange.m_activeColor);
        } else {
            pPainter->setOpacity(0.2);
            pPainter->setPen(markRange.m_disabledColor);
            pPainter->setBrush(markRange.m_disabledColor);
        }

        // let top and bottom of the rect out of the widget
        if (m_orientation == Qt::Horizontal) {
            pPainter->drawRect(QRectF(QPointF(startPosition, -2.0),
                    QPointF(endPosition, height() + 1.0)));
        } else {
            pPainter->drawRect(QRectF(QPointF(-2.0, startPosition),
                    QPointF(width() + 1.0, endPosition)));
        }
    }
}

void WOverview::drawMarks(QPainter* pPainter, const float offset, const float gain) {
    QFont markerFont = pPainter->font();
    markerFont.setPixelSize(m_iLabelFontSize * m_scaleFactor);
    QFontMetricsF fontMetrics(markerFont);

    // Text labels are rendered so they do not overlap with other WaveformMarks'
    // labels. If the text would be too wide, it is elided. However, the user
    // can hover the mouse cursor over a label to show the whole label text,
    // temporarily hiding any following labels that would be drawn over it.
    // This requires looping over the WaveformMarks twice and the marks must be
    // sorted in the order they appear on the waveform.
    // In the first loop, the lines are drawn and the text to render plus its
    // location are calculated then stored in a WaveformMarkLabel. The text must
    // be drawn in the second loop to prevent the lines of following
    // WaveformMarks getting drawn over it. The second loop is in the separate
    // drawMarkLabels function so it can be called after drawCurrentPosition so
    // the view of labels is not obscured by the playhead.

    bool markHovered = false;
    for (int i = 0; i < m_marksToRender.size(); ++i) {
        WaveformMarkPointer pMark = m_marksToRender.at(i);
        PainterScope painterScope(pPainter);

        const qreal markPosition = math_clamp(
                offset + m_marksToRender.at(i)->getSamplePosition() * gain,
                0.0,
                static_cast<qreal>(width()));
        pMark->m_linePosition = markPosition;

        QPen shadowPen(QBrush(pMark->borderColor()), 2.5 * m_scaleFactor);

        QLineF line;
        if (m_orientation == Qt::Horizontal) {
            line.setLine(markPosition, 0.0, markPosition, height());
        } else {
            line.setLine(0.0, markPosition, width(), markPosition);
        }
        pPainter->setPen(shadowPen);
        pPainter->drawLine(line);

        pPainter->setPen(pMark->fillColor());
        pPainter->drawLine(line);

        if (!pMark->m_text.isEmpty()) {
            Qt::Alignment halign = pMark->m_align & Qt::AlignHorizontal_Mask;
            Qt::Alignment valign = pMark->m_align & Qt::AlignVertical_Mask;

            QString text = pMark->m_text;

            // Only allow the text to overlap the following mark if the mouse is
            // hovering over it. Elide it if it would render over the next
            // label, but do not elide it if the next mark's label is not at the
            // same vertical position.
            if (pMark != m_pHoveredMark && i < m_marksToRender.size() - 1) {
                float nextMarkPosition = -1.0;
                for (int m = i + 1; m < m_marksToRender.size() - 1; ++m) {
                    WaveformMarkPointer otherMark = m_marksToRender.at(m);
                    bool otherAtSameHeight = valign == (otherMark->m_align & Qt::AlignVertical_Mask);
                    // Hotcues always show at least their number.
                    bool otherHasLabel = !otherMark->m_text.isEmpty() || otherMark->getHotCue() != Cue::kNoHotCue;
                    if (otherAtSameHeight && otherHasLabel) {
                        nextMarkPosition = offset + otherMark->getSamplePosition() * gain;
                        break;
                    }
                }
                if (nextMarkPosition != -1.0) {
                    text = fontMetrics.elidedText(text, Qt::ElideRight, nextMarkPosition - markPosition - 5);
                }
            }
            // Sometimes QFontMetrics::elidedText turns the QString into just an
            // elipsis character, so always show at least the hotcue number if
            // the label does not fit.
            if ((text.isEmpty() || text == "…") && pMark->getHotCue() != Cue::kNoHotCue) {
                text = QString::number(pMark->getHotCue() + 1);
            }

            QRectF textRect = fontMetrics.boundingRect(text);
            QPointF textPoint;
            if (m_orientation == Qt::Horizontal) {
                if (halign == Qt::AlignLeft) {
                    textPoint.setX(markPosition - textRect.width() - 5.5);
                } else if (halign == Qt::AlignHCenter) {
                    textPoint.setX(markPosition - textRect.width() / 2);
                } else { // AlignRight
                    textPoint.setX(markPosition + 1.5);
                }

                if (valign == Qt::AlignTop) {
                    textPoint.setY(fontMetrics.height());
                } else if (valign == Qt::AlignVCenter) {
                    textPoint.setY((textRect.height() + height()) / 2);
                } else { // AlignBottom
                    textPoint.setY(float(height()) - 0.5f);
                }
            } else { // Vertical
                if (halign == Qt::AlignLeft) {
                    textPoint.setX(1.0f);
                } else if (halign == Qt::AlignHCenter) {
                    textPoint.setX((width() - textRect.width()) / 2);
                } else { // AlignRight
                    textPoint.setX(width() - textRect.width());
                }

                if (valign == Qt::AlignTop) {
                    textPoint.setY(markPosition - 1.0f);
                } else if (valign == Qt::AlignVCenter) {
                    textPoint.setY(markPosition + textRect.height() / 2);
                } else { // AlignBottom
                    textPoint.setY(markPosition + fontMetrics.ascent());
                }
            }

            pMark->m_label.prerender(textPoint, QPixmap(), text, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));
        }

        // Show cue position when hovered
        // The area it will be drawn in needs to be calculated here
        // before drawMarkLabels so drawMarkLabels can avoid drawing
        // labels over the cue position.
        // This can happen for example if the user shows the cue position
        // of a hotcue which is near the intro end position because the
        // intro_end_position WaveformMark label is drawn at the top.
        // However, the drawing of this text needs to happen in
        // drawMarkLabels so none of the WaveformMark lines are drawn
        // on top of the position text.

        // WaveformMark::m_align refers to the alignment of the label,
        // so if the label is on bottom draw the position text on top and
        // vice versa.
        if (pMark == m_pHoveredMark) {
            Qt::Alignment valign = pMark->m_align & Qt::AlignVertical_Mask;
            QPointF positionTextPoint(markPosition + 1.5, 0);
            if (valign == Qt::AlignTop) {
                positionTextPoint.setY(float(height()) - 0.5f);
            } else {
                positionTextPoint.setY(fontMetrics.height());
            }

            double markSamples = pMark->getSamplePosition();
            double trackSamples = m_trackSamplesControl->get();
            double currentPositionSamples = m_playpositionControl->get() * trackSamples;
            double markTime = samplePositionToSeconds(markSamples);
            double markTimeRemaining = samplePositionToSeconds(trackSamples - markSamples);
            double markTimeDistance = samplePositionToSeconds(markSamples - currentPositionSamples);
            QString cuePositionText = mixxx::Duration::formatTime(markTime) + " -" +
                    mixxx::Duration::formatTime(markTimeRemaining);
            QString cueTimeDistanceText = mixxx::Duration::formatTime(fabs(markTimeDistance));
            // Cast to int to avoid confusingly switching from -0:00 to 0:00 as
            // the playhead passes the cue
            if (static_cast<int>(markTimeDistance) < 0) {
                cueTimeDistanceText = "-" + cueTimeDistanceText;
            }

            m_cuePositionLabel.prerender(positionTextPoint, QPixmap(), cuePositionText, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));

            QPointF timeDistancePoint(positionTextPoint.x(), (fontMetrics.height() + height()) / 2);
            m_cueTimeDistanceLabel.prerender(timeDistancePoint, QPixmap(), cueTimeDistanceText, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));
            markHovered = true;
        }
    }
    if (!markHovered) {
        m_cuePositionLabel.clear();
        m_cueTimeDistanceLabel.clear();
    }
}

void WOverview::drawPickupPosition(QPainter* pPainter) {
    PainterScope painterScope(pPainter);

    if (m_orientation == Qt::Vertical) {
        pPainter->setTransform(QTransform(0, 1, 1, 0, 0, 0));
    }

    pPainter->setPen(QPen(QBrush(m_qColorBackground), 1 * m_scaleFactor));
    pPainter->setOpacity(0.5);
    pPainter->drawLine(m_iPickupPos + 1, 0, m_iPickupPos + 1, breadth());
    pPainter->drawLine(m_iPickupPos - 1, 0, m_iPickupPos - 1, breadth());

    pPainter->setPen(QPen(m_signalColors.getPlayPosColor(), 1 * m_scaleFactor));
    pPainter->setOpacity(1.0);
    pPainter->drawLine(m_iPickupPos, 0, m_iPickupPos, breadth());

    pPainter->drawLine(m_iPickupPos - 2, 0, m_iPickupPos, 2);
    pPainter->drawLine(m_iPickupPos, 2, m_iPickupPos + 2, 0);
    pPainter->drawLine(m_iPickupPos - 2, 0, m_iPickupPos + 2, 0);

    pPainter->drawLine(m_iPickupPos - 2, breadth() - 1, m_iPickupPos, breadth() - 3);
    pPainter->drawLine(m_iPickupPos, breadth() - 3, m_iPickupPos + 2, breadth() - 1);
    pPainter->drawLine(m_iPickupPos - 2, breadth() - 1, m_iPickupPos + 2, breadth() - 1);
}

void WOverview::drawTimeRuler(QPainter* pPainter) {
    QFont markerFont = pPainter->font();
    markerFont.setPixelSize(m_iLabelFontSize * m_scaleFactor);
    QFontMetricsF fontMetrics(markerFont);

    QFont shadowFont = pPainter->font();
    shadowFont.setWeight(99);
    shadowFont.setPixelSize(m_iLabelFontSize * m_scaleFactor);
    QPen shadowPen(Qt::black, 2.5 * m_scaleFactor);

    if (m_bTimeRulerActive) {
        if (!m_bLeftClickDragging) {
            QLineF line;
            if (m_orientation == Qt::Horizontal) {
                line.setLine(m_timeRulerPos.x(), 0.0, m_timeRulerPos.x(), height());
            } else {
                line.setLine(0.0, m_timeRulerPos.x(), width(), m_timeRulerPos.x());
            }
            pPainter->setPen(shadowPen);
            pPainter->drawLine(line);

            pPainter->setPen(QPen(m_signalColors.getPlayPosColor(), 1 * m_scaleFactor));
            pPainter->drawLine(line);
        }

        QPointF textPoint = m_timeRulerPos;
        QPointF textPointDistance = m_timeRulerPos;
        qreal widgetPositionFraction;
        qreal padding = 1.0; // spacing between line and text
        if (m_orientation == Qt::Horizontal) {
            textPoint = QPointF(textPoint.x() + padding, fontMetrics.height());
            textPointDistance = QPointF(textPointDistance.x() + padding,
                    (fontMetrics.height() + height()) / 2);
            widgetPositionFraction = m_timeRulerPos.x() / width();
        } else {
            textPoint.setX(0);
            textPointDistance.setX(0);
            widgetPositionFraction = m_timeRulerPos.y() / height();
        }
        qreal trackSamples = m_trackSamplesControl->get();
        qreal timePosition = samplePositionToSeconds(
                widgetPositionFraction * trackSamples);
        qreal timePositionTillEnd = samplePositionToSeconds(
                (1 - widgetPositionFraction) * trackSamples);
        qreal timeDistance = samplePositionToSeconds(
                (widgetPositionFraction - m_playpositionControl->get()) * trackSamples);

        QString timeText = mixxx::Duration::formatTime(timePosition) + " -" + mixxx::Duration::formatTime(timePositionTillEnd);

        m_timeRulerPositionLabel.prerender(textPoint, QPixmap(), timeText, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));
        m_timeRulerPositionLabel.draw(pPainter);

        QString timeDistanceText = mixxx::Duration::formatTime(fabs(timeDistance));
        // Cast to int to avoid confusingly switching from -0:00 to 0:00 as
        // the playhead passes the point
        if (static_cast<int>(timeDistance) < 0) {
            timeDistanceText = "-" + timeDistanceText;
        }
        m_timeRulerDistanceLabel.prerender(textPointDistance, QPixmap(), timeDistanceText, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));
        m_timeRulerDistanceLabel.draw(pPainter);
    } else {
        m_timeRulerPositionLabel.clear();
        m_timeRulerDistanceLabel.clear();
    }
}

void WOverview::drawMarkLabels(QPainter* pPainter, const float offset, const float gain) {
    QFont markerFont = pPainter->font();
    markerFont.setPixelSize(m_iLabelFontSize * m_scaleFactor);
    QFontMetricsF fontMetrics(markerFont);

    // Draw WaveformMark labels
    for (const auto& pMark : m_marksToRender) {
        if (m_pHoveredMark != nullptr && pMark != m_pHoveredMark) {
            if (pMark->m_label.intersects(m_pHoveredMark->m_label)) {
                continue;
            }
        }
        if (m_bShowCueTimes &&
                (pMark->m_label.intersects(m_cuePositionLabel) || pMark->m_label.intersects(m_cueTimeDistanceLabel))) {
            continue;
        }
        if (pMark->m_label.intersects(m_timeRulerPositionLabel) || pMark->m_label.intersects(m_timeRulerDistanceLabel)) {
            continue;
        }

        pMark->m_label.draw(pPainter);
    }

    if (m_bShowCueTimes) {
        m_cuePositionLabel.draw(pPainter);
        m_cueTimeDistanceLabel.draw(pPainter);
    }

    // draw duration of WaveformMarkRanges
    for (auto&& markRange : m_markRanges) {
        if (markRange.showDuration() && markRange.active() && markRange.visible()) {
            // Active mark ranges by definition have starts/ends that are not
            // disabled.
            const qreal startValue = markRange.start();
            const qreal endValue = markRange.end();

            const qreal startPosition = offset + startValue * gain;
            const qreal endPosition = offset + endValue * gain;

            if (startPosition < 0.0 && endPosition < 0.0) {
                continue;
            }
            QString duration = mixxx::Duration::formatTime(
                    samplePositionToSeconds(endValue - startValue));

            QRectF durationRect = fontMetrics.boundingRect(duration);
            qreal x;

            WaveformMarkRange::DurationTextLocation textLocation = markRange.durationTextLocation();
            if (textLocation == WaveformMarkRange::DurationTextLocation::Before) {
                x = startPosition - durationRect.width() - 5.5;
            } else {
                x = endPosition + 1.5;
            }

            QPointF durationBottomLeft(x, fontMetrics.height());

            markRange.m_durationLabel.prerender(durationBottomLeft, QPixmap(), duration, markerFont, m_labelTextColor, m_labelBackgroundColor, width(), getDevicePixelRatioF(this));

            if (!(markRange.m_durationLabel.intersects(m_cuePositionLabel) || markRange.m_durationLabel.intersects(m_cueTimeDistanceLabel) || markRange.m_durationLabel.intersects(m_timeRulerPositionLabel) || markRange.m_durationLabel.intersects(m_timeRulerDistanceLabel))) {
                markRange.m_durationLabel.draw(pPainter);
            }
        }
    }
}

void WOverview::paintText(const QString& text, QPainter* pPainter) {
    PainterScope painterScope(pPainter);
    QColor lowColor = m_signalColors.getLowColor();
    lowColor.setAlphaF(0.5);
    QPen lowColorPen(
            QBrush(lowColor), 1.25 * m_scaleFactor,
            Qt::SolidLine, Qt::RoundCap);
    pPainter->setPen(lowColorPen);
    QFont font = pPainter->font();
    QFontMetrics fm(font);

    // TODO: The following use of QFontMetrics::width(const QString&, int) const
    // is deprecated and should be replaced with
    // QFontMetrics::horizontalAdvance(const QString&, int) const. However, the
    // proposed alternative has just been introduced in Qt 5.11.
    // Until the minimum required Qt version of Mixx is increased, we need a
    // version check here.
    #if (QT_VERSION < QT_VERSION_CHECK(5, 11, 0))
    int textWidth = fm.width(text);
    #else
    int textWidth = fm.horizontalAdvance(text);
    #endif

    if (textWidth > length()) {
        qreal pointSize = font.pointSizeF();
        pointSize = pointSize * (length() - 5 * m_scaleFactor) / textWidth;
        if (pointSize < 6 * m_scaleFactor) {
            pointSize = 6 * m_scaleFactor;
        }
        font.setPointSizeF(pointSize);
        pPainter->setFont(font);
    }
    if (m_orientation == Qt::Vertical) {
        pPainter->setTransform(QTransform(0, 1, -1, 0, width(), 0));
    }
    pPainter->drawText(10 * m_scaleFactor, 12 * m_scaleFactor, text);
    pPainter->resetTransform();
}

double WOverview::samplePositionToSeconds(double sample) {
    double trackTime = sample /
            (m_trackSampleRateControl->get() * mixxx::kEngineChannelCount);
    return trackTime / m_pRateRatioControl->get();
}

void WOverview::resizeEvent(QResizeEvent* pEvent) {
    Q_UNUSED(pEvent);   
    // Play-position potmeters range from 0 to 1 but they allow out-of-range
    // sets. This is to give VC access to the pre-roll area.
    const double kMaxPlayposRange = 1.0;
    const double kMinPlayposRange = 0.0;

    // Values of zero and one in normalized space.
    const double zero = (0.0 - kMinPlayposRange) / (kMaxPlayposRange - kMinPlayposRange);
    const double one = (1.0 - kMinPlayposRange) / (kMaxPlayposRange - kMinPlayposRange);

    // These coefficients convert between widget space and normalized value
    // space.
    m_a = (length() - 1) / (one - zero);
    m_b = zero * m_a;

    m_devicePixelRatio = getDevicePixelRatioF(this);

    m_waveformImageScaled = QImage();
    m_diffGain = 0;
    Init();
}

void WOverview::dragEnterEvent(QDragEnterEvent* pEvent) {
    DragAndDropHelper::handleTrackDragEnterEvent(pEvent, m_group, m_pConfig);
}
void WOverview::dropEvent(QDropEvent* pEvent) {
    DragAndDropHelper::handleTrackDropEvent(pEvent, *this, m_group, m_pConfig);
}