#include "panels/LoadingOverlay.hpp"
#include <QColor>
#include <QEvent>
#include <QLabel>
#include <QVBoxLayout>

#include "Theme.hpp"

namespace geopro::app {

LoadingOverlay::LoadingOverlay(QWidget* parent) : QWidget(parent), label_(new QLabel(this)) {
    Q_ASSERT(parent);  // 契约：必须有父（遮罩几何跟随父，无父无法工作）
    setAttribute(Qt::WA_StyledBackground, true);
    label_->setText(QStringLiteral("加载中…"));
    label_->setAlignment(Qt::AlignCenter);
    auto* lay = new QVBoxLayout(this);
    lay->addWidget(label_);
    if (parent) parent->installEventFilter(this);

    // 半透明遮罩跟随主题：浅色白纱深字（原版），暗色深纱浅字，避免暗色下刺眼白蒙板。
    const auto applyTheme = [this]() {
        const QColor veil = isDarkTheme() ? tokenColor("bg/app") : QColor(255, 255, 255);
        setStyleSheet(QStringLiteral("background: rgba(%1,%2,%3,160);")
                          .arg(veil.red()).arg(veil.green()).arg(veil.blue()));
        label_->setStyleSheet(QStringLiteral("background: transparent; color: %1;")
                                  .arg(tokenColor("text/primary").name()));
    };
    applyTheme();
    connect(&ThemeManager::instance(), &ThemeManager::changed, this, applyTheme);
    hide();
}

void LoadingOverlay::showOver() {
    if (parentWidget()) setGeometry(parentWidget()->rect());
    raise();
    show();
}

bool LoadingOverlay::eventFilter(QObject* obj, QEvent* ev) {
    if (obj == parentWidget() && ev->type() == QEvent::Resize && isVisible()) {
        setGeometry(parentWidget()->rect());
    }
    return QWidget::eventFilter(obj, ev);
}

}  // namespace geopro::app