#include "Knob.h"

namespace serum
{

Knob::Knob (const juce::String& name, std::function<juce::String (float)> fmt)
    : formatter (std::move (fmt))
{
    setSliderStyle (juce::Slider::RotaryVerticalDrag);
    setTextBoxStyle (juce::Slider::NoTextBox, false, 0, 0);
    setRange (0.0, 1.0);
    setDoubleClickReturnValue (true, 0.5);
    setName (name);
    setComponentID (name);
}

juce::String Knob::getTextFromValue (double value)
{
    if (formatter)
        return formatter ((float) value);
    return formatPercent ((float) value);
}

void Knob::mouseDown (const juce::MouseEvent& e)
{
    juce::Slider::mouseDown (e);
    showValuePopup (e);
}

void Knob::mouseDrag (const juce::MouseEvent& e)
{
    juce::Slider::mouseDrag (e);
    showValuePopup (e);
}

void Knob::mouseUp (const juce::MouseEvent& e)
{
    juce::Slider::mouseUp (e);
    hideValuePopup();
}

void Knob::mouseExit (const juce::MouseEvent& e)
{
    juce::Slider::mouseExit (e);
    hideValuePopup();
}

// ---------------------------------------------------------------------------
// The floating readout lives as a child of the top-level component so it can
// follow the cursor outside this knob's own bounds without being clipped, and
// it never intercepts mouse clicks so it can't block interaction.
// ---------------------------------------------------------------------------
void Knob::showValuePopup (const juce::MouseEvent& e)
{
    auto* topLevel = getTopLevelComponent();
    if (topLevel == nullptr)
        return;

    if (valuePopup == nullptr)
    {
        valuePopup = std::make_unique<juce::Label>();
        valuePopup->setAlwaysOnTop (true);
        valuePopup->setInterceptsMouseClicks (false, false);
        valuePopup->setColour (juce::Label::backgroundColourId, juce::Colours::transparentBlack);
        valuePopup->setColour (juce::Label::textColourId, theme::text);
        valuePopup->setFont (juce::Font (14.0f, juce::Font::bold));
        valuePopup->setJustificationType (juce::Justification::centred);
        topLevel->addAndMakeVisible (valuePopup.get());
    }

    valuePopup->setText (getTextFromValue (getValue()), juce::dontSendNotification);

    constexpr int w = 84;
    constexpr int h = 24;
    constexpr int gap = 10;

    const auto cursor = topLevel->getLocalPoint (nullptr, e.getScreenPosition());
    valuePopup->setBounds (cursor.getX() - w / 2, cursor.getY() - h - gap, w, h);
}

void Knob::hideValuePopup()
{
    valuePopup.reset();
}

} // namespace serum