monoslicer/Source/WaveformDisplay.cpp

#include "WaveformDisplay.h"

WaveformDisplay::WaveformDisplay(SliceManager& sm) : sliceManager(sm)
{
    addAndMakeVisible(hScrollBar);
    hScrollBar.addListener(this);
    hScrollBar.setRangeLimits(0.0, 1.0);
    hScrollBar.setCurrentRange(0.0, 1.0);

    startTimerHz(30);
}

WaveformDisplay::~WaveformDisplay()
{
    stopTimer();
    hScrollBar.removeListener(this);
}

void WaveformDisplay::timerCallback() { repaint(); }

void WaveformDisplay::setSampleBuffer(const juce::AudioBuffer<float>* buffer, double sr)
{
    sampleBuffer = buffer;
    sampleRate = sr;
    zoomFactor = 1.0f;
    scrollOffset = 0.0f;
    overviewDirty = true;
    rebuildOverview();
    syncScrollBar();
    repaint();
}

void WaveformDisplay::setPlaybackPosition(int sample) { playbackSample = sample; }
void WaveformDisplay::setActiveSliceIndex(int index) { activeSliceIndex = index; }
void WaveformDisplay::setSelectedSlice(int index) { selectedSliceIndex = index; }
void WaveformDisplay::setOnEmptyAreaClick(std::function<void()> callback) { onEmptyAreaClick = std::move(callback); }
void WaveformDisplay::setOnKeyClick(std::function<void(int)> callback) { onKeyClick = std::move(callback); }

void WaveformDisplay::zoomIn()
{
    zoomFactor *= 1.5f;
    zoomFactor = juce::jlimit(1.0f, 64.0f, zoomFactor);
    syncScrollBar();
    repaint();
}

void WaveformDisplay::zoomOut()
{
    zoomFactor /= 1.5f;
    zoomFactor = juce::jlimit(1.0f, 64.0f, zoomFactor);
    syncScrollBar();
    repaint();
}

void WaveformDisplay::zoomReset()
{
    zoomFactor = 1.0f;
    scrollOffset = 0.0f;
    syncScrollBar();
    repaint();
}

void WaveformDisplay::scrollLeft()
{
    scrollOffset -= 1.0f / zoomFactor;
    scrollOffset = juce::jlimit(0.0f, 1.0f, scrollOffset);
    syncScrollBar();
    repaint();
}

void WaveformDisplay::scrollRight()
{
    scrollOffset += 1.0f / zoomFactor;
    scrollOffset = juce::jlimit(0.0f, 1.0f, scrollOffset);
    syncScrollBar();
    repaint();
}

void WaveformDisplay::syncScrollBar()
{
    if (updatingScroll) return;
    updatingScroll = true;
    float visibleRatio = 1.0f / zoomFactor;
    hScrollBar.setCurrentRange(scrollOffset, visibleRatio);
    updatingScroll = false;
}

void WaveformDisplay::scrollBarMoved(juce::ScrollBar*, double)
{
    if (updatingScroll) return;
    updatingScroll = true;
    scrollOffset = static_cast<float>(hScrollBar.getCurrentRangeStart());
    scrollOffset = juce::jlimit(0.0f, 1.0f, scrollOffset);
    updatingScroll = false;
    repaint();
}

void WaveformDisplay::rebuildOverview()
{
    if (!sampleBuffer || sampleBuffer->getNumSamples() == 0)
        return;

    const int numSamples = sampleBuffer->getNumSamples();
    const int numChannels = sampleBuffer->getNumChannels();
    const int blockSize = juce::jmax(1, numSamples / overviewResolution);

    overviewBuffer.setSize(2, overviewResolution, false, false, false);
    for (int i = 0; i < overviewResolution; ++i)
    {
        int start = i * blockSize;
        int end = juce::jmin(start + blockSize, numSamples);
        float minVal = 0.0f, maxVal = 0.0f;

        for (int s = start; s < end; ++s)
        {
            float avg = 0.0f;
            for (int ch = 0; ch < numChannels; ++ch)
                avg += sampleBuffer->getSample(ch, s);
            avg /= static_cast<float>(juce::jmax(1, numChannels));
            minVal = juce::jmin(minVal, avg);
            maxVal = juce::jmax(maxVal, avg);
        }

        overviewBuffer.setSample(0, i, minVal);
        overviewBuffer.setSample(1, i, maxVal);
    }

    overviewDirty = false;
}

juce::Rectangle<float> WaveformDisplay::getWaveformArea() const
{
    auto b = getLocalBounds().toFloat();
    return b.withTrimmedLeft(keyWidth).withTrimmedBottom(scrollbarHeight);
}

int WaveformDisplay::getVisibleStart() const
{
    int total = getNumSamples();
    int visible = static_cast<int>(static_cast<float>(total) / zoomFactor);
    return static_cast<int>(scrollOffset * static_cast<float>(juce::jmax(0, total - visible)));
}

int WaveformDisplay::getVisibleEnd() const
{
    int total = getNumSamples();
    int visible = static_cast<int>(static_cast<float>(total) / zoomFactor);
    return juce::jmin(total, getVisibleStart() + visible);
}

int WaveformDisplay::xToSample(int x) const
{
    auto area = getWaveformArea();
    float ratio = static_cast<float>(x - static_cast<int>(area.getX())) / area.getWidth();
    ratio = juce::jlimit(0.0f, 1.0f, ratio);
    int start = getVisibleStart();
    int end = getVisibleEnd();
    return start + static_cast<int>(ratio * static_cast<float>(end - start));
}

int WaveformDisplay::sampleToX(int sample) const
{
    auto area = getWaveformArea();
    int start = getVisibleStart();
    int end = getVisibleEnd();
    int range = end - start;
    if (range <= 0) return static_cast<int>(area.getX());
    float ratio = static_cast<float>(sample - start) / static_cast<float>(range);
    return static_cast<int>(area.getX() + ratio * area.getWidth());
}

int WaveformDisplay::keyRowToMidiNote(int row) const
{
    const int numRows = 25;
    const int baseMidiNote = 60;
    return baseMidiNote + (numRows - 1 - row);
}

int WaveformDisplay::midiNoteToSliceIndex(int note) const
{
    const auto& slices = sliceManager.getSlices();
    int numSlices = sliceManager.getNumSlices();
    for (int i = 0; i < numSlices; ++i)
    {
        if (slices[static_cast<size_t>(i)].midiNote == note)
            return i;
    }
    return -1;
}

int WaveformDisplay::findNearestSliceAtPixel(int pixelX, int tolerancePx) const
{
    const auto& slices = sliceManager.getSlices();
    int bestIdx = -1;
    int bestDist = tolerancePx + 1;
    for (int i = 0; i < static_cast<int>(slices.size()); ++i)
    {
        int markerX = sampleToX(slices[static_cast<size_t>(i)].startSample);
        int dist = std::abs(pixelX - markerX);
        if (dist < bestDist)
        {
            bestDist = dist;
            bestIdx = i;
        }
    }
    return bestIdx;
}

void WaveformDisplay::paint(juce::Graphics& g)
{
    auto bounds = getLocalBounds().toFloat();
    g.fillAll(juce::Colour(0xff1a1a2e));

    if (!sampleBuffer || sampleBuffer->getNumSamples() == 0)
    {
        auto textArea = bounds.withTrimmedBottom(scrollbarHeight);
        g.setColour(juce::Colours::grey);
        g.setFont(14.0f);
        g.drawText("No audio file loaded.", textArea, juce::Justification::centred);
        return;
    }

    auto waveBounds = bounds.withTrimmedBottom(scrollbarHeight);

    // Ruler across full width (drawn first so keys can overlap)
    drawRuler(g, waveBounds.removeFromTop(20.0f));

    // Left key area (matches piano roll)
    drawKeys(g, waveBounds.withWidth(keyWidth));

    // Waveform and markers in the area to the right of keys
    auto waveArea = waveBounds.withTrimmedLeft(keyWidth);
    drawWaveform(g, waveArea);
    drawSliceMarkers(g, waveArea);
}

void WaveformDisplay::drawKeys(juce::Graphics& g, juce::Rectangle<float> bounds)
{
    g.setColour(juce::Colour(0xff222233));
    g.fillRect(bounds);

    const int numRows = 25;
    float rowHeight = bounds.getHeight() / static_cast<float>(numRows);

    juce::Colour markerColours[] = {
        juce::Colour(0xffff6b6b), juce::Colour(0xff4ecdc4), juce::Colour(0xffffe66d),
        juce::Colour(0xffa8e6cf), juce::Colour(0xff8b94ff), juce::Colour(0xffff8b94),
        juce::Colour(0xffdda0dd), juce::Colour(0xff87ceeb), juce::Colour(0xff98fb98),
        juce::Colour(0xffffb347), juce::Colour(0xffc39bd3), juce::Colour(0xff76d7c4)
    };

    for (int row = 0; row < numRows; ++row)
    {
        float y = bounds.getY() + static_cast<float>(row) * rowHeight;
        int noteInOctave = (numRows - 1 - row) % 12;
        bool isBlack = (noteInOctave == 1 || noteInOctave == 3 || noteInOctave == 6 ||
                        noteInOctave == 8 || noteInOctave == 10);

        int midiNote = keyRowToMidiNote(row);

        juce::Colour baseCol = isBlack ? juce::Colour(0xff333344) : juce::Colour(0xff555566);

        int sliceIdx = midiNoteToSliceIndex(midiNote);
        if (sliceIdx >= 0 && sliceIdx == activeSliceIndex)
        {
            baseCol = markerColours[sliceIdx % 12].withAlpha(0.25f);
        }

        g.setColour(baseCol);
        g.fillRect(bounds.getX(), y, bounds.getWidth(), rowHeight);

        g.setColour(juce::Colour(0xffaaaaaa));
        g.drawRect(bounds.getX(), y, bounds.getWidth(), rowHeight, 0.5f);

        if (sliceIdx >= 0)
        {
            float dotR = rowHeight * 0.2f;
            float dotX = bounds.getX() + bounds.getWidth() * 0.5f;
            float dotY = y + rowHeight * 0.5f;
            g.setColour(markerColours[sliceIdx % 12].withAlpha(0.7f));
            g.fillEllipse(dotX - dotR, dotY - dotR, dotR * 2.0f, dotR * 2.0f);
        }

        const char* noteNames[] = { "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B" };
        int noteIdx = midiNote % 12;
        int octave = midiNote / 12 - 1;
        juce::String name = juce::String(noteNames[noteIdx]) + juce::String(octave);

        g.setColour(juce::Colours::white.withAlpha(0.6f));
        g.setFont(juce::Font(juce::FontOptions(8.0f)));
        g.drawText(name, static_cast<int>(bounds.getX() + 2.0f), static_cast<int>(y + 1.0f),
                   static_cast<int>(bounds.getWidth() - 4.0f), static_cast<int>(rowHeight - 2.0f),
                   juce::Justification::centredRight);
    }
}

void WaveformDisplay::drawWaveform(juce::Graphics& g, juce::Rectangle<float> bounds)
{
    if (!sampleBuffer || sampleBuffer->getNumSamples() == 0) return;

    int start = getVisibleStart();
    int end = getVisibleEnd();
    int total = getNumSamples();
    float w = bounds.getWidth();
    float h = bounds.getHeight();
    float midY = bounds.getY() + h * 0.5f;

    // Highlight active slice region
    if (activeSliceIndex >= 0 && activeSliceIndex < sliceManager.getNumSlices())
    {
        const auto& slice = sliceManager.getSlice(activeSliceIndex);
        int sStart = juce::jmax(slice.startSample, start);
        int sEnd = juce::jmin(slice.endSample, end);
        if (sEnd > sStart)
        {
            float x1 = bounds.getX() + static_cast<float>(sStart - start) / static_cast<float>(end - start) * w;
            float x2 = bounds.getX() + static_cast<float>(sEnd - start) / static_cast<float>(end - start) * w;

            juce::Colour markerColours[] = {
                juce::Colour(0xffff6b6b), juce::Colour(0xff4ecdc4), juce::Colour(0xffffe66d),
                juce::Colour(0xffa8e6cf), juce::Colour(0xffff8b94), juce::Colour(0xffdda0dd)
            };
            g.setColour(markerColours[activeSliceIndex % 6].withAlpha(0.12f));
            g.fillRect(x1, bounds.getY(), x2 - x1, h);
        }
    }

    // Highlight selected slice region (subtler than active)
    if (selectedSliceIndex >= 0 && selectedSliceIndex < sliceManager.getNumSlices()
        && selectedSliceIndex != activeSliceIndex)
    {
        const auto& slice = sliceManager.getSlice(selectedSliceIndex);
        int sStart = juce::jmax(slice.startSample, start);
        int sEnd = juce::jmin(slice.endSample, end);
        if (sEnd > sStart)
        {
            float x1 = bounds.getX() + static_cast<float>(sStart - start) / static_cast<float>(end - start) * w;
            float x2 = bounds.getX() + static_cast<float>(sEnd - start) / static_cast<float>(end - start) * w;

            juce::Colour markerColours[] = {
                juce::Colour(0xffff6b6b), juce::Colour(0xff4ecdc4), juce::Colour(0xffffe66d),
                juce::Colour(0xffa8e6cf), juce::Colour(0xffff8b94), juce::Colour(0xffdda0dd)
            };
            g.setColour(markerColours[selectedSliceIndex % 6].withAlpha(0.07f));
            g.fillRect(x1, bounds.getY(), x2 - x1, h);
        }
    }

    // Draw waveform directly from sample buffer for crisp rendering
    const int numChannels = sampleBuffer->getNumChannels();
    int visibleRange = end - start;
    if (visibleRange <= 0) return;

    juce::Path filledPath;

    for (int x = 0; x < static_cast<int>(w); ++x)
    {
        float ratio = static_cast<float>(x) / w;
        int s0 = start + static_cast<int>(ratio * static_cast<float>(visibleRange));
        int s1 = start + static_cast<int>((ratio + 1.0f / w) * static_cast<float>(visibleRange));
        s0 = juce::jlimit(0, total - 1, s0);
        s1 = juce::jlimit(0, total, s1);
        if (s1 <= s0) s1 = s0 + 1;

        float maxVal = 0.0f;
        for (int s = s0; s < s1; ++s)
        {
            for (int ch = 0; ch < numChannels; ++ch)
            {
                float val = std::abs(sampleBuffer->getSample(ch, s));
                if (val > maxVal) maxVal = val;
            }
        }

        float yMin = midY - maxVal * h * 0.45f;
        if (x == 0)
            filledPath.startNewSubPath(bounds.getX(), yMin);
        filledPath.lineTo(bounds.getX() + static_cast<float>(x), yMin);
    }

    for (int x = static_cast<int>(w) - 1; x >= 0; --x)
    {
        float ratio = static_cast<float>(x) / w;
        int s0 = start + static_cast<int>(ratio * static_cast<float>(visibleRange));
        int s1 = start + static_cast<int>((ratio + 1.0f / w) * static_cast<float>(visibleRange));
        s0 = juce::jlimit(0, total - 1, s0);
        s1 = juce::jlimit(0, total, s1);
        if (s1 <= s0) s1 = s0 + 1;

        float minVal = 0.0f;
        for (int s = s0; s < s1; ++s)
        {
            for (int ch = 0; ch < numChannels; ++ch)
            {
                float val = sampleBuffer->getSample(ch, s);
                if (val < minVal) minVal = val;
            }
        }

        float yMax = midY - minVal * h * 0.45f;
        filledPath.lineTo(bounds.getX() + static_cast<float>(x), yMax);
    }

    filledPath.closeSubPath();

    juce::ColourGradient gradient(juce::Colour(0xff4488ff), bounds.getX(), bounds.getY(),
                                   juce::Colour(0xff2244aa), bounds.getX(), bounds.getBottom(), false);
    g.setGradientFill(gradient);
    g.fillPath(filledPath);

    // Center line
    g.setColour(juce::Colour(0x40ffffff));
    g.drawHorizontalLine(static_cast<int>(midY), bounds.getX(), bounds.getRight());

    // Playback position
    if (playbackSample >= start && playbackSample < end)
    {
        float px = bounds.getX() + static_cast<float>(playbackSample - start) / static_cast<float>(end - start) * w;
        g.setColour(juce::Colours::white);
        g.drawVerticalLine(static_cast<int>(px), bounds.getY(), bounds.getBottom());
    }
}

void WaveformDisplay::drawSliceMarkers(juce::Graphics& g, juce::Rectangle<float> bounds)
{
    const auto& slices = sliceManager.getSlices();
    float w = bounds.getWidth();
    int start = getVisibleStart();
    int end = getVisibleEnd();

    juce::Colour markerColours[] = {
        juce::Colour(0xffff6b6b), juce::Colour(0xff4ecdc4), juce::Colour(0xffffe66d),
        juce::Colour(0xffa8e6cf), juce::Colour(0xffff8b94), juce::Colour(0xffdda0dd)
    };

    for (int i = 0; i < static_cast<int>(slices.size()); ++i)
    {
        int sPos = slices[static_cast<size_t>(i)].startSample;
        if (sPos < start || sPos > end) continue;

        float px = bounds.getX() + static_cast<float>(sPos - start) / static_cast<float>(end - start) * w;
        juce::Colour col = markerColours[i % 6];
        bool isActive = (i == activeSliceIndex);
        bool isSelected = (i == selectedSliceIndex);
        bool isHovered = (i == hoveredSliceIndex);

        if (isHovered && !isActive)
        {
            g.setColour(col.brighter(0.6f));
            g.drawLine(px, bounds.getY(), px, bounds.getBottom(), 3.0f);
        }
        else if (isSelected && !isActive)
        {
            g.setColour(col.brighter(0.4f));
            float lineThickness = 2.0f;
            float y = bounds.getY();
            float bottom = bounds.getBottom();
            while (y < bottom)
            {
                float dashEnd = juce::jmin(y + 6.0f, bottom);
                g.drawLine(px, y, px, dashEnd, lineThickness);
                y += 10.0f;
            }
        }
        else
        {
            g.setColour(isActive ? col : col.withAlpha(0.7f));
            float lineThickness = isActive ? 2.0f : 1.0f;
            g.drawLine(px, bounds.getY(), px, bounds.getBottom(), lineThickness);
        }

        // Label
        g.setColour(col);
        g.setFont(isActive ? juce::Font(juce::FontOptions(11.0f, juce::Font::bold)) : juce::Font(juce::FontOptions(10.0f)));
        g.drawText(juce::String(i + 1), static_cast<int>(px + 2.0f), static_cast<int>(bounds.getY()),
                   20, 14, juce::Justification::centredLeft);

        // Triangle at top
        float triSize = (isActive || isSelected) ? 5.0f : 4.0f;
        juce::Colour triCol = isSelected ? col.brighter(0.3f) : col;
        g.setColour(isActive ? col : triCol);
        juce::Path tri;
        tri.addTriangle(px - triSize, bounds.getY(), px + triSize, bounds.getY(), px, bounds.getY() + triSize * 2.0f);
        g.fillPath(tri);
    }
}

void WaveformDisplay::drawRuler(juce::Graphics& g, juce::Rectangle<float> bounds)
{
    g.setColour(juce::Colour(0xff2a2a4a));
    g.fillRect(bounds);

    // Key area in ruler too
    g.setColour(juce::Colour(0xff222233));
    g.fillRect(bounds.withWidth(keyWidth));

    if (!sampleBuffer || sampleRate <= 0) return;

    int start = getVisibleStart();
    int end = getVisibleEnd();
    float w = bounds.getWidth() - keyWidth;
    float offsetX = keyWidth;

    g.setColour(juce::Colour(0xff888888));
    g.setFont(9.0f);

    double visibleSeconds = static_cast<double>(end - start) / sampleRate;
    double tickInterval = 0.1;
    if (visibleSeconds > 5.0) tickInterval = 1.0;
    else if (visibleSeconds > 2.0) tickInterval = 0.5;
    else if (visibleSeconds > 0.5) tickInterval = 0.1;
    else tickInterval = 0.01;

    double startSec = static_cast<double>(start) / sampleRate;
    double firstTick = std::ceil(startSec / tickInterval) * tickInterval;

    for (double t = firstTick; t < static_cast<double>(end) / sampleRate; t += tickInterval)
    {
        int samp = static_cast<int>(t * sampleRate);
        float px = bounds.getX() + offsetX + static_cast<float>(samp - start) / static_cast<float>(end - start) * w;

        g.drawVerticalLine(static_cast<int>(px), bounds.getY() + 12.0f, bounds.getBottom());

        juce::String label = juce::String(t, 2) + "s";
        g.drawText(label, static_cast<int>(px + 2.0f), static_cast<int>(bounds.getY()),
                   40, 12, juce::Justification::centredLeft);
    }
}

void WaveformDisplay::resized()
{
    auto bounds = getLocalBounds();
    auto scrollBarRow = bounds.removeFromBottom(static_cast<int>(scrollbarHeight));
    hScrollBar.setBounds(scrollBarRow);
}

void WaveformDisplay::mouseDown(const juce::MouseEvent& e)
{
    if (!sampleBuffer || sampleBuffer->getNumSamples() == 0)
    {
        if (onEmptyAreaClick)
            onEmptyAreaClick();
        return;
    }

    auto bounds = getLocalBounds().toFloat();
    auto keyArea = bounds.withWidth(keyWidth).withTrimmedBottom(scrollbarHeight).withTrimmedTop(20.0f);

    // Check if click is in the key area
    if (e.getPosition().getX() < static_cast<int>(keyArea.getWidth()))
    {
        const int numRows = 25;
        float rowHeight = keyArea.getHeight() / static_cast<float>(numRows);
        int row = static_cast<int>((static_cast<float>(e.getPosition().getY()) - keyArea.getY()) / rowHeight);
        row = juce::jlimit(0, numRows - 1, row);
        int midiNote = keyRowToMidiNote(row);

        if (onKeyClick)
            onKeyClick(midiNote);
        return;
    }

    // Right click removes slice
    if (e.mods.isRightButtonDown())
    {
        int sample = xToSample(static_cast<int>(e.getPosition().getX()));
        auto area = getWaveformArea();
        int range = getVisibleEnd() - getVisibleStart();
        int tolerance = (range > 0) ? juce::jmax(1, static_cast<int>(10.0f * static_cast<float>(range) / area.getWidth())) : 1;
        sliceManager.removeSliceAt(sample, tolerance);
        return;
    }

    // Left click on waveform area
    if (e.mods.isLeftButtonDown())
    {
        int px = static_cast<int>(e.getPosition().getX());
        int sample = xToSample(px);
        auto area = getWaveformArea();
        int range = getVisibleEnd() - getVisibleStart();
        int tolerancePx = 10;
        int toleranceSamples = (range > 0) ? juce::jmax(1, static_cast<int>(static_cast<float>(tolerancePx) * static_cast<float>(range) / area.getWidth())) : 1;

        // Check if clicking near an existing marker — drag it
        const auto& slices = sliceManager.getSlices();
        int nearIdx = -1;
        int nearDist = toleranceSamples + 1;
        for (int i = 0; i < static_cast<int>(slices.size()); ++i)
        {
            int dist = std::abs(slices[static_cast<size_t>(i)].startSample - sample);
            if (dist < nearDist)
            {
                nearDist = dist;
                nearIdx = i;
            }
        }

        if (nearIdx >= 0)
        {
            draggingSliceIndex = nearIdx;
        }
        else
        {
            sliceManager.addSliceManual(sample);

            // Enter drag mode for the newly placed marker
            const auto& slices2 = sliceManager.getSlices();
            int bestIdx = -1;
            int bestDist = std::numeric_limits<int>::max();
            for (int i = 0; i < static_cast<int>(slices2.size()); ++i)
            {
                int dist = std::abs(slices2[static_cast<size_t>(i)].startSample - sample);
                if (dist < bestDist)
                {
                    bestDist = dist;
                    bestIdx = i;
                }
            }
            draggingSliceIndex = bestIdx;
        }
    }
}

void WaveformDisplay::mouseDrag(const juce::MouseEvent& e)
{
    if (draggingSliceIndex >= 0)
    {
        int sample = xToSample(static_cast<int>(e.getPosition().getX()));
        const auto& slices = sliceManager.getSlices();
        if (draggingSliceIndex < static_cast<int>(slices.size()))
            sliceManager.moveSlice(slices[static_cast<size_t>(draggingSliceIndex)].startSample, sample);
    }
}

void WaveformDisplay::mouseUp(const juce::MouseEvent&) { draggingSliceIndex = -1; }

void WaveformDisplay::mouseMove(const juce::MouseEvent& e)
{
    if (!sampleBuffer || sampleBuffer->getNumSamples() == 0)
    {
        hoveredSliceIndex = -1;
        return;
    }

    auto area = getWaveformArea();
    if (e.getPosition().getX() < static_cast<int>(area.getX()) || e.getPosition().getX() > static_cast<int>(area.getRight()))
    {
        hoveredSliceIndex = -1;
        return;
    }

    int range = getVisibleEnd() - getVisibleStart();
    int tolerancePx = 10;
    int toleranceSamples = (range > 0) ? juce::jmax(1, static_cast<int>(static_cast<float>(tolerancePx) * static_cast<float>(range) / area.getWidth())) : 1;
    int sample = xToSample(static_cast<int>(e.getPosition().getX()));

    const auto& slices = sliceManager.getSlices();
    int bestIdx = -1;
    int bestDist = toleranceSamples + 1;
    for (int i = 0; i < static_cast<int>(slices.size()); ++i)
    {
        int dist = std::abs(slices[static_cast<size_t>(i)].startSample - sample);
        if (dist < bestDist)
        {
            bestDist = dist;
            bestIdx = i;
        }
    }
    hoveredSliceIndex = bestIdx;
}

void WaveformDisplay::mouseWheelMove(const juce::MouseEvent& e, const juce::MouseWheelDetails& wheel)
{
    auto area = getWaveformArea();

    // Handle horizontal scrolling (trackpad 2-finger horizontal drag)
    if (std::abs(wheel.deltaX) > 0.001f)
    {
        scrollOffset -= wheel.deltaX * 0.02f / zoomFactor;
        scrollOffset = juce::jlimit(0.0f, 1.0f, scrollOffset);
        syncScrollBar();
        repaint();
        return;
    }

    // Handle zoom via vertical scroll
    float oldZoom = zoomFactor;
    zoomFactor *= (1.0f + wheel.deltaY * 0.3f);
    zoomFactor = juce::jlimit(1.0f, 64.0f, zoomFactor);

    float mouseXRatio = (static_cast<float>(e.getPosition().getX()) - area.getX()) / area.getWidth();
    mouseXRatio = juce::jlimit(0.0f, 1.0f, mouseXRatio);
    int oldVisible = static_cast<int>(static_cast<float>(getNumSamples()) / oldZoom);
    int newVisible = static_cast<int>(static_cast<float>(getNumSamples()) / zoomFactor);
    float mouseSample = scrollOffset * static_cast<float>(juce::jmax(0, getNumSamples() - oldVisible)) + mouseXRatio * static_cast<float>(oldVisible);
    scrollOffset = (mouseSample - mouseXRatio * static_cast<float>(newVisible)) / static_cast<float>(juce::jmax(1, getNumSamples() - newVisible));
    scrollOffset = juce::jlimit(0.0f, 1.0f, scrollOffset);

    syncScrollBar();
    repaint();
}