#include "global.h"
#include <QStyle>
#include <QApplication>
#include <QAbstractButton>
#include <QPushButton>
#include <QEvent>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QGraphicsDropShadowEffect>

// 启动 500ms 闪烁：每 500ms 切换一次动态属性，QSS 据此在 40%↔100% 透明度间切换
QTimer* startBlink(QWidget* w, const char* prop)
{
    // 复用已存在的定时器
    if (auto* t = w->findChild<QTimer*>(QString("blink_") + prop))
        return t;
    QTimer* t = new QTimer(w);
    t->setObjectName(QString("blink_") + prop);
    t->setInterval(500);
    QObject::connect(t, &QTimer::timeout, w, [w, prop]() {
        bool cur = w->property(prop).toBool();
        w->setProperty(prop, !cur);
        w->style()->unpolish(w);
        w->style()->polish(w);
        w->update();
    });
    w->setProperty(prop, true);
    t->start();
    return t;
}

void stopBlink(QWidget* w, const char* prop)
{
    if (auto* t = w->findChild<QTimer*>(QString("blink_") + prop)) {
        t->stop();
        delete t;
    }
    w->setProperty(prop, false);
    w->style()->unpolish(w);
    w->style()->polish(w);
    w->update();
}

QString cancelButtonStyle(int fontPx)
{
    return QString(
        "QPushButton{font-size:%1px;}"
        "QPushButton:hover,QPushButton:pressed,QPushButton:focus"
        "{background-color:%2;color:#FFFFFF;border:2px solid #FFA6A9;}")
        .arg(fontPx).arg(C::DANGER);
}

// ===================== 按钮焦点（选中）光圈 =====================
ButtonFocusGlow::ButtonFocusGlow(const QColor& glow, QObject* parent)
    : QObject(parent), m_glow(glow)
{
}

// 触摸屏上手指抬起后指针并不会跟着移开，Qt 会把刚点过的按钮一直留在悬停(:hover)态。
// 本项目的悬停样式与选中样式是同一套（蓝底/亮边），残留的悬停看起来就是"还选中着"，
// 此时再按 Tab 选中另一个按钮，屏幕上就出现了两个"选中"。选中态一律以焦点为准，
// 故每次产生新的选中（点击/触摸按下、焦点移入）时，把其它按钮残留的悬停态清掉。
static void clearStaleHover(QWidget* keep)
{
    // 用 allWidgets 而非 qApp->findChildren：顶层窗口并非 QApplication 的子对象
    const QWidgetList all = QApplication::allWidgets();
    for (QWidget* w : all) {
        if (w == keep || !w->underMouse() || !qobject_cast<QAbstractButton*>(w))
            continue;
        w->setAttribute(Qt::WA_UnderMouse, false);
        w->update();
    }
}

bool ButtonFocusGlow::eventFilter(QObject* obj, QEvent* ev)
{
    QWidget* w = qobject_cast<QWidget*>(obj);
    if (!w)
        return QObject::eventFilter(obj, ev);

    switch (ev->type()) {
    case QEvent::FocusIn:
        clearStaleHover(w);   // 新的选中出现 → 旧按钮的悬停残影一并清掉
        if (qobject_cast<QPushButton*>(w) && !w->graphicsEffect()) {
            QGraphicsDropShadowEffect* g = new QGraphicsDropShadowEffect(w);   // 挂一圈发光（偏移 0 → 四周光晕）
            g->setBlurRadius(40);    // 光晕大小（越大越强）
            g->setOffset(0, 0);
            g->setColor(m_glow);
            w->setGraphicsEffect(g);
        }
        break;
    case QEvent::FocusOut:
        if (qobject_cast<QPushButton*>(w) && w->graphicsEffect()) {
            // 光晕带模糊、偏移为 0，会溢出按钮矩形画到父控件上。
            // 只重绘按钮自身清不掉溢出的那圈，Tab 移走焦点后仍会留下蓝色残影，
            // 所以把父控件整块标脏，连同按钮一起重绘。
            QWidget* parent = w->parentWidget();
            w->setGraphicsEffect(nullptr);   // Qt 会删除旧效果
            w->update();
            if (parent)
                parent->update(parent->rect());
        }
        break;
    case QEvent::MouseButtonPress:
        // 触摸/点击与 Tab 归一到同一个焦点：谁最后操作，谁就是唯一的选中
        if (static_cast<QMouseEvent*>(ev)->button() == Qt::LeftButton
            && (w->focusPolicy() & Qt::ClickFocus)) {
            w->setFocus(Qt::MouseFocusReason);
            clearStaleHover(w);
        }
        break;
    default:
        break;
    }
    return QObject::eventFilter(obj, ev);
}

void installButtonFocusGlow(QApplication* app)
{
    if (app)
        app->installEventFilter(new ButtonFocusGlow(QColor("#7FBBFF"), app));   // 亮蓝，深色底更醒目
}

// ===================== 方向键（旋钮）隔离 =====================
ArrowKeyGuard::ArrowKeyGuard(QObject* parent)
    : QObject(parent)
{
}

bool ArrowKeyGuard::eventFilter(QObject* obj, QEvent* ev)
{
    if (ev->type() == QEvent::KeyPress) {
        // 只在焦点落在按钮上时拦截：否则 QAbstractButton 会拿方向键去换焦
        QWidget* fw = QApplication::focusWidget();
        if (fw && qobject_cast<QAbstractButton*>(fw)) {
            const int k = static_cast<QKeyEvent*>(ev)->key();
            if (Keys::up(k) || Keys::down(k))
                return true;
        }
    }
    return QObject::eventFilter(obj, ev);
}

void installArrowKeyGuard(QApplication* app)
{
    if (app)
        app->installEventFilter(new ArrowKeyGuard(app));
}

QString appStyleSheet()
{
    const QString s = QString(R"QSS(
* {
    font-family: "Microsoft YaHei", "PingFang SC", "Source Han Sans CN";
    outline: none;
}
QWidget {
    background-color: BG;
    color: TXT;
}
QWidget#pageRoot {
    background-color: BG;
}
QLabel {
    background: transparent;
    color: TXT;
}
QLabel[sub="true"] { color: SUB; }
QLabel[title="true"] { color: TXT; font-weight: 700; }

/* ===== 按钮 ===== */
QPushButton {
    background-color: PHI;
    color: TXT;
    border: 1px solid BD;
    border-radius: 12px;
    font-size: 40px;
}
QPushButton:hover { background-color: PRI; color: TXT; border-color: PRI; }
QPushButton:pressed { background-color: PRI; color: #FFFFFF; border-color: PRI; }
QPushButton:checked { background-color: PRI; color: #FFFFFF; border: none; }
QPushButton:disabled { background-color: DIS; color: DIST; border-color: DIS; }

QPushButton[variant="primary"] { background-color: PRI; color: #FFFFFF; border: none; }
QPushButton[variant="primary"]:disabled { background-color: DIS; color: DIST; }
QPushButton[variant="danger"] { background-color: DAN; color: #FFFFFF; border: 1px solid DAN; border-radius: 6px; }
QPushButton[variant="danger"]:disabled { background-color: DIS; color: DIST; border-color: DIS; }
QPushButton[variant="link"] { background: transparent; color: PRI; border: none; font-size: 22px; }
QPushButton[variant="estop"] {
    background-color: DAN; color: #FFFFFF; border: 1px solid DAN; border-radius: 6px; font-size: 24px; font-weight: 700;
}

/* ===== 输入框 ===== */
QLineEdit {
    background-color: BG;
    border: 2px solid BD;
    border-radius: 8px;
    color: TXT;
    font-size: 50px;
    padding: 0 12px;
}
QLineEdit:focus { border: 3px solid PRI; }

/* ===== 进度条 ===== */
QProgressBar {
    background-color: PHI;
    border: none;
    border-radius: 4px;
    text-align: center;
    color: #FFFFFF;
    font-size: 40px;
}
QProgressBar::chunk { background-color: PRI; border-radius: 4px; }

/* ===== 表格 ===== */
QTableWidget {
    background-color: PAN;
    color: TXT;
    border: 1px solid BD;
    gridline-color: BD;
    font-size: 40px;
    alternate-background-color: #2A3442;
}
QHeaderView::section {
    background-color: PHI;
    color: TXT;
    border: none;
    border-right: 1px solid BD;
    border-bottom: 1px solid BD;
    padding: 8px;
    font-size: 40px;
}
QTableWidget::item { padding: 6px; }
QTableWidget::item:selected { background-color: PRI; color: #FFFFFF; }

/* ===== 数字键盘 ===== */
QPushButton[numpad="true"] {
    background-color: PHI; color: TXT; border: 1px solid BD; border-radius: 12px; font-size: 50px;
}
QPushButton[numpad="true"]:pressed { background-color: PRI; color: #FFFFFF; }

/* ===== 焦点样式（Tab / Shift+Tab / 光标选中：高亮按钮显色 + 边框发亮） ===== */
QPushButton:focus {
    background-color: PRI;
    color: #FFFFFF;
    border: 4px solid #8ABFFF;
}
QPushButton:focus:disabled {
    background-color: DIS; color: DIST; border: 1px solid DIS;
}
QPushButton[variant="danger"]:focus,
QPushButton[variant="estop"]:focus {
    background-color: DAN;
    border: 2px solid #FFA6A9;
}
QPushButton[variant="link"]:focus {
    background: transparent;
    color: PRI;
    border: none;
}
QPushButton[numpad="true"]:focus {
    background-color: PRI;
    color: #FFFFFF;
    border: 2px solid #8ABFFF;
}

/* ===== 告警文字（红色闪烁由 blink 属性驱动） ===== */
QLabel[alert="true"] { color: DAN; font-weight: 700; }
QLabel[alert="true"][blink="false"] { color: rgba(229,72,77,102); }
QLabel[amber="true"] { color: WAR; font-weight: 700; }

/* ===== 数据卡片 ===== */
QWidget[card="true"] {
    background-color: PAN;
    border: 2px solid BD;
    border-radius: 12px;
}
QLabel[cardTitle="true"] { color: TXT; font-weight: 700; }
)QSS");

    // 用占位替换（注意：DIST 须在 DIS 之前替换，避免前缀误匹配）
    QString out = s;
    out.replace("DIST", C::DISABLED_T);
    out.replace("DIS",  C::DISABLED);
    out.replace("BG",   C::BG);
    out.replace("PAN",  C::PANEL);
    out.replace("PHI",  C::PANEL_HI);
    out.replace("BD",   C::BORDER);
    out.replace("TXT",  C::TEXT);
    out.replace("SUB",  C::TEXT_SUB);
    out.replace("PRI",  C::PRIMARY);
    out.replace("SUC",  C::SUCCESS);
    out.replace("WAR",  C::WARNING);
    out.replace("DAN",  C::DANGER);
    return out;
}