#include "PluginEditor.h"

namespace gelyk
{

static constexpr float fontScale = 1.4f;

static juce::Font monoFont(float height)
{
    return juce::Font(juce::FontOptions(juce::Font::getDefaultMonospacedFontName(), height * fontScale,
                                        juce::Font::plain));
}

// ---------------------------------------------------------------------------
// NeonLookAndFeel
// ---------------------------------------------------------------------------

NeonLookAndFeel::NeonLookAndFeel()
{
    refreshPalette();
}

void NeonLookAndFeel::refreshPalette()
{
    setColour(juce::Slider::textBoxTextColourId, cyan());
    setColour(juce::Slider::textBoxOutlineColourId, juce::Colours::transparentBlack);
    setColour(juce::Slider::textBoxBackgroundColourId, panel());
    setColour(juce::ComboBox::backgroundColourId, panel());
    setColour(juce::ComboBox::outlineColourId, line());
    setColour(juce::ComboBox::textColourId, cyan());
    setColour(juce::ComboBox::arrowColourId, cyan());
}

void NeonLookAndFeel::drawLinearSlider(juce::Graphics& g, int x, int y, int width, int height,
                                       float sliderPos, float, float,
                                       const juce::Slider::SliderStyle style, juce::Slider& slider)
{
    const bool vertical = (style == juce::Slider::LinearVertical);
    const float cx = x + width * 0.5f;

    // Track
    if (vertical)
    {
        const float tw = 2.0f;
        juce::Path track;
        track.addRoundedRectangle(cx - tw * 0.5f, (float) y, tw, (float) height, 1.0f);
        g.setColour(line());
        g.fillPath(track);

        // Filled region from centre (0 dB) down to the handle, glowing.
        const float midY = y + height * 0.5f;
        const float top = juce::jmin(midY, sliderPos);
        const float bottom = juce::jmax(midY, sliderPos);
        juce::Path fill;
        fill.addRoundedRectangle(cx - 3.0f, top, 6.0f, juce::jmax(1.0f, bottom - top), 3.0f);
        g.setColour(cyan());
        g.fillPath(fill);

        // Handle.
        g.setColour(slider.isMouseOverOrDragging(true) ? violet() : cyan());
        g.fillEllipse(cx - 5.0f, sliderPos - 5.0f, 10.0f, 10.0f);
        g.setColour(bg());
        g.fillEllipse(cx - 2.0f, sliderPos - 2.0f, 4.0f, 4.0f);
    }
    else
    {
        const float th = 2.0f;
        juce::Path track;
        track.addRoundedRectangle((float) x, y + height * 0.5f - th * 0.5f, (float) width, th, 1.0f);
        g.setColour(line());
        g.fillPath(track);
        g.setColour(cyan());
        g.drawHorizontalLine((int) (y + height * 0.5f), sliderPos - 5.0f, sliderPos + 5.0f);
    }
}

void NeonLookAndFeel::drawRotarySlider(juce::Graphics& g, int x, int y, int width, int height,
                                       float sliderPos, float startAngle, float endAngle, juce::Slider& slider)
{
    const float cx = x + width * 0.5f;
    const float cy = y + height * 0.5f;
    const float radius = juce::jmin(width, height) * 0.5f;
    const float toAngle = startAngle + sliderPos * (endAngle - startAngle);
    const float lineW = juce::jmax(2.0f, radius * 0.10f);
    const float arcRadius = radius - lineW * 0.5f;

    // Background disc.
    g.setColour(panel());
    g.fillEllipse(cx - radius, cy - radius, radius * 2.0f, radius * 2.0f);
    g.setColour(line());
    g.drawEllipse(cx - radius, cy - radius, radius * 2.0f, radius * 2.0f, 1.0f);

    // Filled arc (progress).
    juce::Path filledArc;
    filledArc.addCentredArc(cx, cy, arcRadius, arcRadius, 0.0f,
                            startAngle + juce::MathConstants<float>::halfPi,
                            toAngle + juce::MathConstants<float>::halfPi, true);
    juce::PathStrokeType stroke(lineW, juce::PathStrokeType::curved, juce::PathStrokeType::rounded);
    g.setColour(slider.isMouseOverOrDragging(true) ? magenta() : cyan());
    g.strokePath(filledArc, stroke);

    // Pointer line.
    juce::Path pointer;
    const float pointerLength = radius * 0.68f;
    pointer.startNewSubPath(cx, cy);
    pointer.lineTo(cx + pointerLength * std::cos(toAngle),
                   cy + pointerLength * std::sin(toAngle));
    g.setColour(slider.isMouseOverOrDragging(true) ? violet() : cyan());
    g.strokePath(pointer, juce::PathStrokeType(juce::jmax(1.5f, radius * 0.07f),
                                               juce::PathStrokeType::curved,
                                               juce::PathStrokeType::rounded));

    // Centre hub.
    g.setColour(slider.isMouseOverOrDragging(true) ? cyan() : line());
    g.fillEllipse(cx - 2.0f, cy - 2.0f, 4.0f, 4.0f);
}

void NeonLookAndFeel::drawComboBox(juce::Graphics& g, int width, int height, bool,
                                   int, int, int, int, juce::ComboBox& box)
{
    auto corner = 4.0f;
    auto bounds = box.getLocalBounds().toFloat();
    g.setColour(panel());
    g.fillRoundedRectangle(bounds, corner);
    g.setColour(cyan());
    g.drawRoundedRectangle(bounds, corner, 1.0f);

    juce::Rectangle<int> arrowZone(width - 20, 0, 20, height);
    juce::Path p;
    p.startNewSubPath((float) arrowZone.getX() + 4.0f, (float) arrowZone.getCentreY() - 3.0f);
    p.lineTo((float) arrowZone.getCentreX(), (float) arrowZone.getCentreY() + 3.0f);
    p.lineTo((float) arrowZone.getX() + 12.0f, (float) arrowZone.getCentreY() - 3.0f);
    g.setColour(cyan());
    g.strokePath(p, juce::PathStrokeType(1.5f));
}

void NeonLookAndFeel::positionComboBoxText(juce::ComboBox& box, juce::Label& label)
{
    label.setBounds(2, 1, box.getWidth() - 22, box.getHeight() - 2);
    label.setFont(monoFont(13.0f * uiScale));
}

// ---------------------------------------------------------------------------
// BandFader
// ---------------------------------------------------------------------------

void BandFader::paint(juce::Graphics& g)
{
    const float cx = getWidth() * 0.5f;
    const float y = 0.0f;
    const float height = (float) getHeight();

    const float value = getGain();
    const auto start = (float) gainP->getNormalisableRange().start;
    const auto end   = (float) gainP->getNormalisableRange().end;
    const float sliderPos = y + (end - value) / (end - start) * height;

    // Track.
    const float tw = 2.0f;
    g.setColour(lf.line());
    g.fillRect(cx - tw * 0.5f, y, tw, height);

    // Filled region from centre (0 dB) down to the handle.
    const float midY = y + height * 0.5f;
    const float top = juce::jmin(midY, sliderPos);
    const float bottom = juce::jmax(midY, sliderPos);
    g.setColour(lf.cyan());
    g.fillRect(cx - 3.0f, top, 6.0f, juce::jmax(1.0f, bottom - top));

    // Handle.
    g.setColour(hovered || dragging ? lf.violet() : lf.cyan());
    g.fillEllipse(cx - 5.0f, sliderPos - 5.0f, 10.0f, 10.0f);
    g.setColour(lf.bg());
    g.fillEllipse(cx - 2.0f, sliderPos - 2.0f, 4.0f, 4.0f);
}

void BandFader::mouseDown(const juce::MouseEvent& e)
{
    if (gainP == nullptr || freqP == nullptr)
        return;

    if (e.getNumberOfClicks() > 1)
    {
        *gainP = 0.0f;
        repaint();
        return;
    }

    dragging = true;
    startGain = (float) gainP->get();
    startFreq = (float) freqP->get();
    startX = e.getScreenX();
    startY = e.getScreenY();
    repaint();
}

void BandFader::mouseDrag(const juce::MouseEvent& e)
{
    if (!dragging || gainP == nullptr || freqP == nullptr)
        return;

    const float h = (float) juce::jmax(1, getHeight());
    const float dy = (float) (startY - e.getScreenY());
    const float span = (float) gainP->getNormalisableRange().end - (float) gainP->getNormalisableRange().start;
    const float newGain = juce::jlimit((float) gainP->getNormalisableRange().start,
                                       (float) gainP->getNormalisableRange().end,
                                       startGain + dy / h * span);
    if (gainP->get() != newGain)
        *gainP = newGain;

    const float w = dragWidth > 0.0f ? dragWidth : (float) juce::jmax(1, getWidth());
    const float dx = (float) (e.getScreenX() - startX);
    // Track 1:1 with the cursor over the full visualizer width: the fader's screen
    // position moves by exactly the same number of pixels as the mouse.
    const float startXpos = bandFreqToX(startFreq, dragX0, w);
    float newFreq = bandXToFreq(startXpos + dx, dragX0, w);
    newFreq = juce::jlimit(20.0f, 20000.0f, newFreq);

    // Keep the band between its neighbours so they stay ordered left-to-right.
    if (onGetFreqBounds != nullptr)
    {
        const auto [lo, hi] = onGetFreqBounds();
        newFreq = juce::jlimit(lo, hi, newFreq);
    }

    if (std::abs(newFreq - (float) freqP->get()) > 0.5f)
    {
        *freqP = newFreq;
        if (onFreqChange != nullptr)
            onFreqChange();
    }

    repaint();
}

void BandFader::mouseUp(const juce::MouseEvent&)
{
    dragging = false;
    repaint();
}

void BandFader::mouseEnter(const juce::MouseEvent&)
{
    hovered = true;
    repaint();
}

void BandFader::mouseExit(const juce::MouseEvent&)
{
    hovered = false;
    repaint();
}

void BandFader::mouseWheelMove(const juce::MouseEvent&, const juce::MouseWheelDetails& wheel)
{
    if (qP == nullptr)
        return;

    const float delta = (float) (wheel.deltaY * 0.3);
    const float lo = (float) qP->getNormalisableRange().start;
    const float hi = (float) qP->getNormalisableRange().end;
    *qP = juce::jlimit(lo, hi, (float) qP->get() + delta);
}

// ---------------------------------------------------------------------------
// GelykEQAudioProcessorEditor
// ---------------------------------------------------------------------------

GelykEQAudioProcessorEditor::GelykEQAudioProcessorEditor(GelykEQAudioProcessor& p)
    : AudioProcessorEditor(&p),
      processor(p)
{
    setLookAndFeel(&lookAndFeel);
    setOpaque(true);

    titleLabel = std::make_unique<juce::Label>("title", "GELYK");
    titleLabel->setFont(monoFont(26.0f));
    titleLabel->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    titleLabel->setJustificationType(juce::Justification::centredLeft);
    addAndMakeVisible(*titleLabel);

    scaleBox = std::make_unique<juce::ComboBox>("scale");
    scaleBox->addItem("100%", 100);
    scaleBox->addItem("125%", 125);
    scaleBox->addItem("150%", 150);
    scaleBox->addItem("175%", 175);
    scaleBox->addItem("200%", 200);
    scaleBox->setSelectedId(100, juce::dontSendNotification);
    scaleBox->setTooltip("UI scaling");
    scaleBox->onChange = [this] { scaleUI((float) scaleBox->getSelectedId()); };
    addAndMakeVisible(*scaleBox);

    const struct ColorControl
    {
        std::unique_ptr<juce::Label>* label;
        std::unique_ptr<juce::Slider>* slider;
        const char* text;
        double min, max, def;
        const char* tip;
    } colorControls[] = {
        { &waveSensLabel,  &waveSensSlider,  "SENS", -48.0, 24.0, 0.0, "Live waveform sensitivity (dB offset)" },
        { &colorHueLabel, &colorHueSlider, "HUE", -0.5, 0.5, 0.0, "Master colour hue shift" },
        { &colorSatLabel, &colorSatSlider, "SAT", 0.0, 1.0, 1.0, "Master colour saturation" },
        { &colorBriLabel, &colorBriSlider, "BRI", 0.5, 1.5, 1.0, "Master colour brightness" },
        { &waveLabel,     &waveSlider,     "WAVE", 0.0, 1.0, 0.2, "Live waveform opacity" },
    };

    for (const auto& cc : colorControls)
    {
        *cc.label = std::make_unique<juce::Label>("ccap", cc.text);
        (*cc.label)->setFont(monoFont(8.0f));
        (*cc.label)->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        (*cc.label)->setJustificationType(juce::Justification::centred);
        addAndMakeVisible(**cc.label);

        *cc.slider = std::make_unique<juce::Slider>(juce::Slider::LinearHorizontal, juce::Slider::NoTextBox);
        (*cc.slider)->setLookAndFeel(&lookAndFeel);
        (*cc.slider)->setSliderStyle(juce::Slider::LinearHorizontal);
        (*cc.slider)->setRange(cc.min, cc.max, 0.01);
        (*cc.slider)->setDoubleClickReturnValue(true, cc.def);
        (*cc.slider)->setValue(cc.def, juce::dontSendNotification);
        (*cc.slider)->setTooltip(cc.tip);
        addAndMakeVisible(**cc.slider);
    }

    colorHueSlider->onValueChange = [this]
    {
        lookAndFeel.hueShift = (float) colorHueSlider->getValue();
        refreshColors();
    };
    colorSatSlider->onValueChange = [this]
    {
        lookAndFeel.saturation = (float) colorSatSlider->getValue();
        refreshColors();
    };
    colorBriSlider->onValueChange = [this]
    {
        lookAndFeel.brightness = (float) colorBriSlider->getValue();
        refreshColors();
    };
    waveSlider->onValueChange = [this]
    {
        lookAndFeel.waveformOpacity = (float) waveSlider->getValue();
        repaint();
    };
    waveSensSlider->onValueChange = [this]
    {
        lookAndFeel.waveSensitivity = (float) waveSensSlider->getValue();
        repaint();
    };

    // Master gain (vertical fader, far right).
    masterLabel = std::make_unique<juce::Label>("mlab", "MASTER");
    masterLabel->setFont(monoFont(11.0f));
    masterLabel->setColour(juce::Label::textColourId, lookAndFeel.magenta());
    masterLabel->setJustificationType(juce::Justification::centred);
    master = std::make_unique<juce::Slider>(juce::Slider::LinearVertical, juce::Slider::TextBoxBelow);
    master->setLookAndFeel(&lookAndFeel);
    master->setSliderStyle(juce::Slider::LinearVertical);
    master->setTextBoxStyle(juce::Slider::TextBoxBelow, false, 40, 14);
    master->setRange(-24.0, 24.0, 0.01);
    master->setDoubleClickReturnValue(true, 0.0);
    addAndMakeVisible(*masterLabel);
    addAndMakeVisible(*master);

    masterPercent = std::make_unique<juce::Label>("mper", "100%");
    masterPercent->setFont(monoFont(10.0f));
    masterPercent->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    masterPercent->setJustificationType(juce::Justification::centred);
    addAndMakeVisible(*masterPercent);
    updateMasterPercent();
    masterAttachment = std::make_unique<juce::AudioProcessorValueTreeState::SliderAttachment>(
        processor.getAPVTS(), "master", *master);
    master->onValueChange = [this] { updateMasterPercent(); };
    // Band faders.
    const char* const names[numBands] = { "LOW SHELF", "LOW", "LOW-MID", "MID", "HIGH-MID", "HIGH", "HIGH SHELF" };
    const char* const freqs[numBands] = { "60", "160", "400", "800", "1.6K", "4K", "10K" };
    for (int i = 0; i < numBands; ++i)
    {
        auto& w = bands[i];
        const juce::Colour accent = (i % 2 == 0) ? lookAndFeel.cyan() : lookAndFeel.magenta();

        w.freqLabel = std::make_unique<juce::Label>("freq", freqs[i]);
        w.freqLabel->setFont(monoFont(14.0f).boldened());
        w.freqLabel->setColour(juce::Label::textColourId, accent);
        w.freqLabel->setJustificationType(juce::Justification::centred);

        w.gainCaption = std::make_unique<juce::Label>("gname", names[i]);
        w.gainCaption->setFont(monoFont(10.0f));
        w.gainCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.gainCaption->setJustificationType(juce::Justification::centred);

        w.gainValue = std::make_unique<juce::Label>("gval", "0.0");
        w.gainValue->setFont(monoFont(11.0f));
        w.gainValue->setColour(juce::Label::textColourId, accent);
        w.gainValue->setJustificationType(juce::Justification::centred);

        w.qCaption = std::make_unique<juce::Label>("qcap", "Q");
        w.qCaption->setFont(monoFont(10.0f));
        w.qCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.qCaption->setJustificationType(juce::Justification::centred);

        w.qValue = std::make_unique<juce::Label>("qval", "1.00");
        w.qValue->setFont(monoFont(10.0f));
        w.qValue->setColour(juce::Label::textColourId, lookAndFeel.violet());
        w.qValue->setJustificationType(juce::Justification::centred);

        w.gain = std::make_unique<BandFader>(processor.getAPVTS(),
                                             "gain" + juce::String(i),
                                             "freq" + juce::String(i),
                                             "q" + juce::String(i),
                                             lookAndFeel);
        w.gain->onFreqChange = [this]
        {
            resized();
        };

        // Keep bands in left-to-right frequency order: each band can only go up
        // to its right-hand neighbour and down to its left-hand neighbour.
        w.gain->onGetFreqBounds = [this, i]() -> std::pair<float, float>
        {
            auto& apvts = processor.getAPVTS();
            float lo = 20.0f;
            float hi = 20000.0f;
            if (i > 0)
                lo = apvts.getRawParameterValue("freq" + juce::String(i - 1))->load() * 1.01f;
            if (i < numBands - 1)
                hi = apvts.getRawParameterValue("freq" + juce::String(i + 1))->load() * 0.99f;
            return { juce::jmax(20.0f, lo), juce::jmin(20000.0f, hi) };
        };

        w.levelValue = std::make_unique<juce::Label>("lval", "0.0");
        w.levelValue->setFont(monoFont(10.0f));
        w.levelValue->setColour(juce::Label::textColourId, accent);
        w.levelValue->setJustificationType(juce::Justification::centred);

        w.levelCaption = std::make_unique<juce::Label>("lcap", "LEVEL");
        w.levelCaption->setFont(monoFont(10.0f));
        w.levelCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.levelCaption->setJustificationType(juce::Justification::centred);

        w.level = std::make_unique<juce::Slider>(juce::Slider::RotaryVerticalDrag, juce::Slider::NoTextBox);
        w.level->setLookAndFeel(&lookAndFeel);
        w.level->setSliderStyle(juce::Slider::RotaryVerticalDrag);
        w.level->setRotaryParameters(2.4f, 6.9f, true); // ~270° sweep
        w.level->setRange(-24.0, 24.0, 0.01);
        w.level->setDoubleClickReturnValue(true, 0.0);
        w.level->setValue(0.0, juce::dontSendNotification);
        w.level->setTooltip("Gain (level), also adjustable via the fader");
        w.level->onValueChange = [this, i]
        {
            updateGainValue(i);
        };

        w.q = std::make_unique<juce::Slider>(juce::Slider::RotaryVerticalDrag, juce::Slider::NoTextBox);
        w.q->setLookAndFeel(&lookAndFeel);
        w.q->setSliderStyle(juce::Slider::RotaryVerticalDrag);
        w.q->setRotaryParameters(2.4f, 6.9f, true); // ~270° sweep
        w.q->setRange(0.1, 6.0, 0.01);
        w.q->setDoubleClickReturnValue(true, 1.0);
        w.q->setValue(1.0, juce::dontSendNotification);
        w.q->onValueChange = [this, i]
        {
            bands[i].qValue->setText(juce::String(bands[i].q->getValue(), 2), juce::dontSendNotification);
        };

        w.freqCaption = std::make_unique<juce::Label>("fcap", "FREQ");
        w.freqCaption->setFont(monoFont(10.0f));
        w.freqCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.freqCaption->setJustificationType(juce::Justification::centred);

        w.freqValue = std::make_unique<juce::Label>("fval", "160");
        w.freqValue->setFont(monoFont(10.0f));
        w.freqValue->setColour(juce::Label::textColourId, lookAndFeel.cyan());
        w.freqValue->setJustificationType(juce::Justification::centred);

        w.freq = std::make_unique<juce::Slider>(juce::Slider::RotaryVerticalDrag, juce::Slider::NoTextBox);
        w.freq->setLookAndFeel(&lookAndFeel);
        w.freq->setSliderStyle(juce::Slider::RotaryVerticalDrag);
        w.freq->setRotaryParameters(2.4f, 6.9f, true); // ~270° sweep
        auto freqRange = juce::NormalisableRange<double>(20.0, 20000.0, 0.5);
        freqRange.setSkewForCentre(1000.0);
        w.freq->setNormalisableRange(freqRange);
        w.freq->setDoubleClickReturnValue(true, 1000.0f);
        w.freq->onValueChange = [this, i]
        {
            float f = bands[i].freq->getValue();
            juce::String txt;
            if (f >= 1000.0f)
                txt = juce::String(f / 1000.0f, 1) + "K";
            else
                txt = juce::String((int) f);
            bands[i].freqValue->setText(txt, juce::dontSendNotification);
            bands[i].freqLabel->setText(txt, juce::dontSendNotification);
        };

        addAndMakeVisible(*w.freqLabel);
        addAndMakeVisible(*w.gainCaption);
        addAndMakeVisible(*w.gainValue);
        addAndMakeVisible(*w.gain);
        addAndMakeVisible(*w.levelValue);
        addAndMakeVisible(*w.levelCaption);
        addAndMakeVisible(*w.level);
        addAndMakeVisible(*w.freqCaption);
        addAndMakeVisible(*w.freqValue);
        addAndMakeVisible(*w.freq);
        addAndMakeVisible(*w.qCaption);
        addAndMakeVisible(*w.q);
        addAndMakeVisible(*w.qValue);

        levelAttachments[i] = std::make_unique<juce::AudioProcessorValueTreeState::SliderAttachment>(
            processor.getAPVTS(), "gain" + juce::String(i), *w.level);
        qAttachments[i] = std::make_unique<juce::AudioProcessorValueTreeState::SliderAttachment>(
            processor.getAPVTS(), "q" + juce::String(i), *w.q);
        freqAttachments[i] = std::make_unique<juce::AudioProcessorValueTreeState::SliderAttachment>(
            processor.getAPVTS(), "freq" + juce::String(i), *w.freq);
    }

    // Status bar.
    statusGit = std::make_unique<juce::Label>("git", processor.getGitInfo());
    statusGit->setFont(monoFont(11.0f));
    statusGit->setColour(juce::Label::textColourId, lookAndFeel.textDim());
    statusGit->setJustificationType(juce::Justification::centredRight);

    statusBar = std::make_unique<juce::Label>("status",
        "GELYK v" + juce::String(ProjectInfo::versionString) + "");
    statusBar->setFont(monoFont(11.0f));
    statusBar->setColour(juce::Label::textColourId, lookAndFeel.cyan().withAlpha(0.8f));
    statusBar->setJustificationType(juce::Justification::centredLeft);
    addAndMakeVisible(*statusBar);
    addAndMakeVisible(*statusGit);

    spectrum.ensureStorageAllocated(128);
    freqBins.ensureStorageAllocated(128);
    eqCurve.resize(128);

    startTimerHz(30);
    refreshColors();
    scaleUI(100.0f);
}

GelykEQAudioProcessorEditor::~GelykEQAudioProcessorEditor()
{
    stopTimer();
    setLookAndFeel(nullptr);
}

void GelykEQAudioProcessorEditor::timerCallback()
{
    processor.getAnalyser().copySpectrum(spectrum, freqBins, 128);

    const int n = 128;
    FilterBand::Type types[numBands];
    float gains[numBands], freqs[numBands], qs[numBands];
    auto& params = processor.getAPVTS();
    for (int i = 0; i < numBands; ++i)
    {
        types[i] = (FilterBand::Type)(i == 0 ? 0 : (i == numBands - 1 ? 2 : 1));
        gains[i] = params.getRawParameterValue("gain" + juce::String(i))->load();
        freqs[i] = params.getRawParameterValue("freq" + juce::String(i))->load();
        qs[i]    = params.getRawParameterValue("q" + juce::String(i))->load();
    }
    computeEQResponse(types, gains, freqs, qs, numBands,
                      (double) processor.getSampleRate(), eqCurve.getRawDataPointer(), n);

    repaint();
}

void GelykEQAudioProcessorEditor::rebuildFaders()
{
}

void GelykEQAudioProcessorEditor::updateGainValue(int i)
{
    const juce::String txt(juce::String(bands[i].level->getValue(), 1));
    bands[i].gainValue->setText(txt, juce::dontSendNotification);
    bands[i].levelValue->setText(txt, juce::dontSendNotification);
}

void GelykEQAudioProcessorEditor::updateMasterPercent()
{
    const float db = (float) master->getValue();
    const float percent = std::pow(10.0f, db / 20.0f) * 100.0f;
    masterPercent->setText(juce::String(percent, 0) + "%", juce::dontSendNotification);
}

void GelykEQAudioProcessorEditor::refreshColors()
{
    lookAndFeel.refreshPalette();

    titleLabel->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    masterLabel->setColour(juce::Label::textColourId, lookAndFeel.magenta());
    masterPercent->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    // The scale dropdown and the master value readout read their text colour from
    // the LookAndFeel at construction, so they must be re-applied explicitly here
    // for the saturation (and hue/brightness) faders to affect them.
    scaleBox->setColour(juce::ComboBox::textColourId, lookAndFeel.cyan());
    master->setColour(juce::Slider::textBoxTextColourId, lookAndFeel.cyan());
    master->setColour(juce::Slider::textBoxBackgroundColourId, lookAndFeel.panel());
    statusBar->setColour(juce::Label::textColourId, lookAndFeel.cyan().withAlpha(0.8f));
    statusGit->setColour(juce::Label::textColourId, lookAndFeel.textDim());
    colorHueLabel->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    colorSatLabel->setColour(juce::Label::textColourId, lookAndFeel.magenta());
    colorBriLabel->setColour(juce::Label::textColourId, lookAndFeel.violet());
    waveLabel->setColour(juce::Label::textColourId, lookAndFeel.textDim());
    waveSensLabel->setColour(juce::Label::textColourId, lookAndFeel.textDim());
    for (int i = 0; i < numBands; ++i)
    {
        auto& w = bands[i];
        const juce::Colour accent = (i % 2 == 0) ? lookAndFeel.cyan() : lookAndFeel.magenta();
        w.freqLabel->setColour(juce::Label::textColourId, accent);
        w.gainCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.gainValue->setColour(juce::Label::textColourId, accent);
        w.levelCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.levelValue->setColour(juce::Label::textColourId, accent);
        w.qCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.qValue->setColour(juce::Label::textColourId, lookAndFeel.violet());
        w.freqCaption->setColour(juce::Label::textColourId, lookAndFeel.textDim());
        w.freqValue->setColour(juce::Label::textColourId, lookAndFeel.cyan());
    }

    repaint();
}

void GelykEQAudioProcessorEditor::scaleUI(float percent)
{
    const float s = percent / 100.0f;
    scaling.store(s);
    lookAndFeel.uiScale = s;
    setSize((int) (1180 * s), (int) (640 * s));
    resized();
    refreshFonts(s);
}

void GelykEQAudioProcessorEditor::refreshFonts(float s)
{
    titleLabel->setFont(monoFont(26.0f * s));
    masterLabel->setFont(monoFont(11.0f * s));
    statusGit->setFont(monoFont(11.0f * s));
    statusBar->setFont(monoFont(11.0f * s));
    colorHueLabel->setFont(monoFont(8.0f * s));
    colorSatLabel->setFont(monoFont(8.0f * s));
    colorBriLabel->setFont(monoFont(8.0f * s));
    waveLabel->setFont(monoFont(8.0f * s));
    waveSensLabel->setFont(monoFont(8.0f * s));

    for (int i = 0; i < numBands; ++i)
    {
        auto& w = bands[i];
        w.freqLabel->setFont(monoFont(14.0f * s).boldened());
        w.gainCaption->setFont(monoFont(10.0f * s));
        w.gainValue->setFont(monoFont(11.0f * s));
        w.levelCaption->setFont(monoFont(10.0f * s));
        w.levelValue->setFont(monoFont(10.0f * s));
        w.qCaption->setFont(monoFont(10.0f * s));
        w.qValue->setFont(monoFont(10.0f * s));
        w.freqCaption->setFont(monoFont(10.0f * s));
        w.freqValue->setFont(monoFont(10.0f * s));
    }

    repaint();
}

void GelykEQAudioProcessorEditor::resized()
{
    juce::Rectangle<int> area = getLocalBounds();
    const float s = scaling.load();

    const int headerH = (int) (48 * s);
    const int footerH = (int) (26 * s);
    const int pad = (int) (12 * s);

    // Header.
    juce::Rectangle<int> header = area.removeFromTop(headerH);
    titleLabel->setBounds(header.removeFromLeft((int) (180 * s)).reduced(pad, 0));
    scaleBox->setBounds(header.removeFromRight((int) (90 * s)).reduced((int)(6*s), (int)(9*s)));

    // Colour controls, just left of the scaling dropdown.
    juce::Rectangle<int> colorArea = header.removeFromRight((int) (360 * s)).reduced((int)(2*s), (int)(9*s));
    std::unique_ptr<juce::Slider>* colorSliders[] = { &waveSensSlider, &colorHueSlider, &colorSatSlider, &colorBriSlider, &waveSlider };
    std::unique_ptr<juce::Label>* colorLabels[]   = { &waveSensLabel, &colorHueLabel, &colorSatLabel, &colorBriLabel, &waveLabel };
    int cellW = colorArea.getWidth() / 5;
    for (int i = 0; i < 5; ++i)
    {
        juce::Rectangle<int> cell = colorArea.removeFromLeft(cellW);
        (*colorLabels[i])->setBounds(cell.removeFromTop((int)(13*s)));
        (*colorSliders[i])->setBounds(cell);
    }

    // Footer.
    juce::Rectangle<int> footer = area.removeFromBottom(footerH);
    footer.reduce(pad, 0);
    statusBar->setBounds(footer.removeFromLeft(footer.getWidth() / 2));
    statusGit->setBounds(footer);

    // Master column (right).
    const int masterW = (int) (64 * s);
    juce::Rectangle<int> masterArea = area.removeFromRight(masterW);

    const int x0 = area.getX();
    const int y0 = area.getY();
    const int totalW = area.getWidth();
    const int height = area.getHeight();

    const int gap = (int) (12 * s);
    const int colW = (totalW - gap * (numBands - 1)) / numBands;

    for (int i = 0; i < numBands; ++i)
    {
        auto& w = bands[i];
        const int captionH = (int) (20 * s);
        const int valueH   = (int) (17 * s);
        const int freqH    = (int) (23 * s);
        const int knobStackH = (int) (16 * s) + (int)(48 * s) + (int)(12 * s); // value + knob + caption

        // Fixed, evenly spaced column for all labels and the knob row.
        juce::Rectangle<int> col(x0 + i * (colW + gap), y0, colW, height);
        w.gainCaption->setBounds(col.removeFromTop(captionH));
        w.gainValue->setBounds(col.removeFromTop(valueH));

        // Only the fader slides horizontally to the band's frequency on the shared
        // log axis; everything below stays anchored to the fixed column.
        juce::Rectangle<int> body = col;
        const int faderH = body.getHeight() - freqH - knobStackH - (int)(6 * s);

        const float f = processor.getAPVTS().getRawParameterValue("freq" + juce::String(i))->load();
        const int cx = (int) bandFreqToX(f, (float) x0, (float) totalW);
        const int faderX = juce::jlimit(x0, x0 + totalW - colW, cx - colW / 2);
        w.gain->setBounds(faderX, body.getY(), colW, faderH);
        w.gain->setDragSpace((float) x0, (float) totalW);

        juce::Rectangle<int> rest = col;
        rest.removeFromTop(faderH + (int)(6 * s));
        w.freqLabel->setBounds(rest.removeFromTop(freqH));

        // Bottom control row: LEVEL, FREQ and Q knobs side by side.
        juce::Rectangle<int> knobRow = rest;
        bandSections[i] = knobRow.toFloat();
        int rowW = knobRow.getWidth();
        int thirdW = rowW / 3;

        // LEVEL (left third).
        juce::Rectangle<int> levelCol = knobRow.removeFromLeft(thirdW);
        w.levelValue->setBounds(levelCol.removeFromTop((int)(16*s)));
        w.level->setBounds(levelCol.removeFromTop((int)(48*s)).reduced((int)(colW*0.08f), 0));
        w.levelCaption->setBounds(levelCol.removeFromTop((int)(12*s)));

        // FREQ (middle third).
        juce::Rectangle<int> freqCol = knobRow.removeFromLeft(thirdW);
        w.freqValue->setBounds(freqCol.removeFromTop((int)(16*s)));
        w.freq->setBounds(freqCol.removeFromTop((int)(48*s)).reduced((int)(colW*0.08f), 0));
        w.freqCaption->setBounds(freqCol.removeFromTop((int)(12*s)));

        // Q (right third).
        w.qValue->setBounds(knobRow.removeFromTop((int)(16*s)));
        w.q->setBounds(knobRow.removeFromTop((int)(48*s)).reduced((int)(colW*0.08f), 0));
        w.qCaption->setBounds(knobRow.removeFromTop((int)(12*s)));
    }

    // Master column.
    juce::Rectangle<int> msub = masterArea.reduced((int)(14*s), (int)(6*s));
    masterLabel->setBounds(msub.removeFromTop((int) (22 * s)));
    masterPercent->setBounds(msub.removeFromTop((int) (16 * s)));
    master->setBounds(msub);
}

void GelykEQAudioProcessorEditor::paint(juce::Graphics& g)
{
    const float s = scaling.load();
    g.fillAll(lookAndFeel.bg());

    juce::Rectangle<int> area = getLocalBounds();
    const int headerH = (int) (46 * s);
    const int footerH = (int) (26 * s);
    juce::Rectangle<int> mainArea = area;
    mainArea.removeFromTop(headerH);
    mainArea.removeFromBottom(footerH);
    mainArea.removeFromRight((int) (64 * s));

    // The visualizer is the gain-fader field, bounded above by the header controls
    // and below by the LEVEL/FREQ/Q knob row. Keep the waveform/spectrum and grid
    // strictly inside it so they don't spill over the knobs.
    const float captionH  = 20.0f * s;
    const float valueH    = 17.0f * s;
    const float freqH     = 23.0f * s;
    const float knobStackH = (16.0f + 48.0f + 12.0f) * s;
    const float topY = (float) mainArea.getY() + captionH + valueH;
    const float botY = (float) mainArea.getBottom() - freqH - knobStackH - 6.0f * s;

    // Neon grid lines.
    g.setColour(lookAndFeel.line());
    for (int i = 1; i <= 4; ++i)
    {
        if (i == 3) continue; // skip the 0 dB centre (drawn separately)
        float yy = topY + (botY - topY) * (i / 5.0f);
        g.drawHorizontalLine((int) yy, (float) mainArea.getX(), (float) mainArea.getRight());
    }

    // 0 dB centre line (glowing cyan).
    const float centreLineY = topY + (botY - topY) * 0.5f;
    g.setColour(lookAndFeel.cyan().withAlpha(0.55f));
    g.drawHorizontalLine((int) centreLineY, (float) mainArea.getX(), (float) mainArea.getRight());

    // Spectrum overlay. The live waveform uses a fixed range tuned to real
    // per-FFT-bin levels: a single loud bin reads ~0 dB at the top edge, typical
    // content (~-20 dB) sits mid-screen, and -40 dB is the floor. SENS shifts the
    // whole trace up/down as a dB offset.
    if (spectrum.size() > 2)
    {
        const float waveAlpha = lookAndFeel.waveformOpacity;
        const float sensDb = lookAndFeel.waveSensitivity; // dB offset applied to the trace
        const float dbMax = 0.0f;    // full-scale bin → top of the plot
        const float dbMin = -40.0f;  // silence floor → bottom of the plot
        juce::Path path;
        const float x0 = (float) mainArea.getX();
        const float width = (float) mainArea.getWidth();

        for (int i = 0; i < spectrum.size(); ++i)
        {
            float db = juce::jlimit(dbMin, dbMax, spectrum[i] + sensDb);
            float norm = (db - dbMin) / (dbMax - dbMin); // 0..1 up
            float xx = (i < freqBins.size())
                           ? bandFreqToX(freqBins[i], x0, width)
                           : x0 + (float) i / (float) (spectrum.size() - 1) * width;
            float yy = botY - norm * (botY - topY);
            if (i == 0) path.startNewSubPath(xx, yy);
            else        path.lineTo(xx, yy);
        }

        juce::Path filled = path;
        filled.lineTo((float) mainArea.getRight(), botY);
        filled.lineTo((float) mainArea.getX(), botY);
        filled.closeSubPath();

        g.setGradientFill(juce::ColourGradient(lookAndFeel.magenta().withAlpha(0.30f * waveAlpha),
                                               (float) mainArea.getX(), topY,
                                               lookAndFeel.magenta().withAlpha(0.05f * waveAlpha),
                                               (float) mainArea.getX(), botY, false));
        g.fillPath(filled);
        g.setColour(lookAndFeel.cyan().withAlpha(0.9f * waveAlpha));
        g.strokePath(path, juce::PathStrokeType(1.6f * s));
    }

    // Static EQ curve overlay (the actual summed filter response).
    if (eqCurve.size() > 2)
    {
        const float x0 = (float) mainArea.getX();
        const float width = (float) mainArea.getWidth();
        const float centreY = topY + (botY - topY) * 0.5f;
        const float halfH = (botY - topY) * 0.42f; // ±24 dB maps here

        juce::Path curve;
        for (int i = 0; i < eqCurve.size(); ++i)
        {
            float db = juce::jlimit(-24.0f, 24.0f, eqCurve[i]);
            float yy = centreY - (db / 24.0f) * halfH;
            // eqCurve bins are log-spaced from 20 Hz to 20 kHz; use the same
            // log-frequency mapping as the columns so peaks line up with bands.
            const float f = 20.0f * std::pow(1000.0f, (float) i / (float) (eqCurve.size() - 1));
            float xx = bandFreqToX(f, x0, width);
            if (i == 0) curve.startNewSubPath(xx, yy);
            else        curve.lineTo(xx, yy);
        }

        g.setColour(lookAndFeel.violet().withAlpha(0.20f));
        g.strokePath(curve, juce::PathStrokeType(7.0f * s, juce::PathStrokeType::curved,
                                                 juce::PathStrokeType::rounded));
        g.setColour(lookAndFeel.violet());
        g.strokePath(curve, juce::PathStrokeType(1.8f * s, juce::PathStrokeType::curved,
                                                 juce::PathStrokeType::rounded));
    }

    // Very light rounded outline around each band's knob group (LEVEL/FREQ/Q).
    g.setColour(lookAndFeel.line());
    const float corner = 6.0f * s;
    const float inset = 2.0f * s;
    for (int i = 0; i < numBands; ++i)
    {
        juce::Rectangle<float> r = bandSections[i].reduced(inset);
        g.drawRoundedRectangle(r, corner, 1.0f * s);
    }
}

} // namespace gelyk