#include "KnobLookAndFeel.h"

namespace serum
{

void KnobLookAndFeel::drawRotarySlider (juce::Graphics& g, int x, int y, int width, int height,
                                        float sliderPos, float rotaryStartAngle, float rotaryEndAngle,
                                        juce::Slider& slider)
{
    const auto dial = juce::Rectangle<float> ((float) x, (float) y, (float) width, (float) height);
    if (dial.isEmpty())
        return;

    const float radius = juce::jmin (dial.getWidth(), dial.getHeight()) * 0.5f - 2.0f;
    if (radius <= 1.0f)
        return;

    const float lineW  = juce::jlimit (1.5f, 5.0f, radius * 0.22f);
    const float arcR   = radius - lineW * 0.5f;
    const float centreX = dial.getCentreX();
    const float centreY = dial.getCentreY();
    const float toAngle = rotaryStartAngle + sliderPos * (rotaryEndAngle - rotaryStartAngle);
    const bool  live    = slider.isEnabled();

    juce::Path track;
    track.addCentredArc (centreX, centreY, arcR, arcR, 0.0f, rotaryStartAngle, rotaryEndAngle, true);
    g.setColour (theme::outline);
    g.strokePath (track, juce::PathStrokeType (lineW, juce::PathStrokeType::curved, juce::PathStrokeType::rounded));

    if (live)
    {
        juce::Path value;
        value.addCentredArc (centreX, centreY, arcR, arcR, 0.0f, rotaryStartAngle, toAngle, true);
        g.setColour (theme::accent.withAlpha (slider.isMouseOverOrDragging() ? 1.0f : 0.75f));
        g.strokePath (value, juce::PathStrokeType (lineW, juce::PathStrokeType::curved, juce::PathStrokeType::rounded));
    }

    const float pointer = radius * 0.62f;
    g.setColour (live ? theme::text : theme::textDim);
    g.drawLine (centreX + std::sin (toAngle) * pointer * 0.35f,
                centreY - std::cos (toAngle) * pointer * 0.35f,
                centreX + std::sin (toAngle) * pointer,
                centreY - std::cos (toAngle) * pointer,
                juce::jmax (1.5f, lineW * 0.5f));
}

} // namespace serum