#include "StatusPill.h"

#include <QGuiApplication>
#include <QHBoxLayout>
#include <QLabel>
#include <QPainter>
#include <QPixmap>
#include <QRectF>

namespace
{

// Diameter of the status dot, in device-independent pixels.
const int kDotSizePx = 8;

QPixmap renderDot(const QColor& fill, const QColor& outline)
{
    const qreal dpr = qApp ? qApp->devicePixelRatio() : 1.0;
    QPixmap pixmap(static_cast<int>(kDotSizePx * dpr),
                   static_cast<int>(kDotSizePx * dpr));
    pixmap.setDevicePixelRatio(dpr);
    pixmap.fill(Qt::transparent);

    QPainter painter(&pixmap);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(outline.isValid() ? QPen(outline) : QPen(Qt::NoPen));
    painter.setBrush(fill);
    // Inset by half the pen width so the outline stays inside the pixmap.
    painter.drawEllipse(QRectF(0.5, 0.5, kDotSizePx - 1.0, kDotSizePx - 1.0));
    return pixmap;
}

}  // namespace


StatusPill::StatusPill(QWidget* parent)
    : QWidget(parent)
{
    QHBoxLayout* layout = new QHBoxLayout(this);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(4);

    m_dotLabel     = new QLabel(this);
    m_captionLabel = new QLabel(this);

    layout->addWidget(m_dotLabel);
    layout->addWidget(m_captionLabel);

    hide();
}

void StatusPill::setStatus(const QColor& dotColor, const QColor& outlineColor,
                           const QString& caption)
{
    if (dotColor.isValid())
    {
        m_dotLabel->setPixmap(renderDot(dotColor, outlineColor));
        m_dotLabel->show();
    }
    else
    {
        m_dotLabel->hide();
    }

    m_captionLabel->setText(caption);
    m_captionLabel->setVisible(!caption.isEmpty());
    setVisible(dotColor.isValid() || !caption.isEmpty());
}