#include "ledindicator.h"
#include <QPainter>
#include <QRadialGradient>
#include <QFontMetrics>
#include "global.h"

QSize LedIndicator::sizeHint() const
{
    QFont f = font();
    f.setPixelSize(m_textPx);
    const QFontMetrics fm(f);
    // 宽度 = 文字起点(圆点区 + 左侧 10px) + 文字宽度 + 右侧 10px
    const int w = textLeft() + fm.horizontalAdvance(m_text) + 10;
    return QSize(w, 52);   // 高度与构造函数 setFixedHeight(52) 一致
}

LedIndicator::LedIndicator(const QString& text, QWidget* parent)
    : QWidget(parent), m_text(text)
{
    setFixedHeight(52);
    setAttribute(Qt::WA_TranslucentBackground);
}

void LedIndicator::setState(State s)
{
    m_state = s;
    bool needBlink = (s == RedBlink || s == YellowBlink);
    if (needBlink && !m_blink) {
        m_blink = new QTimer(this);
        m_blink->setInterval(500);
        connect(m_blink, &QTimer::timeout, this, [this]() {
            m_on = !m_on;
            update();
        });
        m_blink->start();
        m_on = true;
    } else if (!needBlink && m_blink) {
        m_blink->stop();
        delete m_blink;
        m_blink = nullptr;
        m_on = true;
    }
    update();
}

void LedIndicator::setText(const QString& t)
{
    m_text = t;
    updateGeometry();   // 文字变了，重新按新宽度请求布局
    update();
}

void LedIndicator::paintEvent(QPaintEvent*)
{
    QPainter p(this);
    p.setRenderHint(QPainter::Antialiasing);

    // 中心圆点颜色
    QColor color = QColor(C::DISABLED); // 灰
    switch (m_state) {
    case Green:         color = QColor(C::SUCCESS); break;
    case Red:           color = QColor(C::DANGER);  break;
    case Yellow:        color = QColor(C::WARNING); break;
    case RedBlink:      color = QColor(C::DANGER);  break;
    case YellowBlink:   color = QColor(C::WARNING); break;
    default:            color = QColor(C::DISABLED); break;
    }

    // 闪烁：40% 透明度
    if ((m_state == RedBlink || m_state == YellowBlink) && !m_on)
        color.setAlpha(102);

    const QPointF c(m_radius + 8, height() / 2.0);

    // 外发光
    if (color.alpha() > 0) {
        QRadialGradient glow(c, m_radius + 8);
        QColor g = color; g.setAlpha(color.alpha() / 3);
        QColor g0 = g; g0.setAlpha(0);
        glow.setColorAt(0.0, g);
        glow.setColorAt(1.0, g0);
        p.setPen(Qt::NoPen);
        p.setBrush(glow);
        p.drawEllipse(c, m_radius + 8, m_radius + 8);
    }

    // 圆形主体（径向渐变）
    QRadialGradient grad(c + QPointF(-m_radius / 3.0, -m_radius / 3.0), m_radius * 1.6);
    QColor hi = color.lighter(130);
    grad.setColorAt(0.0, hi);
    grad.setColorAt(1.0, color);
    p.setBrush(grad);
    p.setPen(QPen(QColor(C::BORDER), 1));
    p.drawEllipse(c, m_radius, m_radius);

    // 文字
    p.setPen(QColor(C::TEXT));
    QFont f = p.font();
    f.setPixelSize(m_textPx);
    p.setFont(f);
    const QRectF textRect(textLeft(), 0, width() - textLeft() - 10, height());
    p.drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, m_text);
}