#ifndef SPINBOX_PASTE_HELPER_H
#define SPINBOX_PASTE_HELPER_H

#include <QObject>
#include <QEvent>
#include <QKeyEvent>
#include <QApplication>
#include <QClipboard>
#include <QSpinBox>
#include <QDoubleSpinBox>
#include <QAbstractSpinBox>

/**
 * @brief SpinBox 粘贴事件过滤器
 * QSpinBox/QDoubleSpinBox 带 prefix 时粘贴会被验证器拒绝，
 * 这里拦截 Ctrl+V，解析剪贴板数值后直接 setValue。
 *
 * 用法：在 setupUI() 之后调用 SpinBoxPasteHelper::install(this);
 */
class SpinBoxPasteFilter : public QObject
{
public:
    explicit SpinBoxPasteFilter(QObject* parent = nullptr) : QObject(parent) {}

    bool eventFilter(QObject* obj, QEvent* event) override
    {
        if (event->type() != QEvent::KeyPress) {
            return QObject::eventFilter(obj, event);
        }

        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
        if (!keyEvent->matches(QKeySequence::Paste)) {
            return QObject::eventFilter(obj, event);
        }

        QString clipText = QApplication::clipboard()->text().trimmed();
        bool ok = false;

        if (QDoubleSpinBox* dsb = qobject_cast<QDoubleSpinBox*>(obj)) {
            double val = clipText.toDouble(&ok);
            if (ok) {
                dsb->setValue(val);
                return true;
            }
        } else if (QSpinBox* sb = qobject_cast<QSpinBox*>(obj)) {
            int val = clipText.toInt(&ok);
            if (ok) {
                sb->setValue(val);
                return true;
            }
        }

        return QObject::eventFilter(obj, event);
    }
};

namespace SpinBoxPasteHelper
{
    /**
     * @brief 为 parent 下所有 QSpinBox/QDoubleSpinBox 安装粘贴过滤器
     */
    inline void install(QWidget* parent)
    {
        SpinBoxPasteFilter* filter = new SpinBoxPasteFilter(parent);
        for (QAbstractSpinBox* sb : parent->findChildren<QAbstractSpinBox*>()) {
            sb->installEventFilter(filter);
        }
    }
}

#endif // SPINBOX_PASTE_HELPER_H