#include "maskManager.h"
#include "maskLayer.h"
#include <QEvent>
#include <QApplication>
#include <QDialog>
#include <QMetaMethod>

MaskManager* MaskManager::m_instance = nullptr;

void MaskManager::initialize(QWidget* mainWindow)
{
    if(!m_instance)
        m_instance = new MaskManager(mainWindow);
}

MaskManager* MaskManager::instance()
{
    Q_ASSERT(m_instance);
    return m_instance;
}

MaskManager::MaskManager(QWidget* mainWindow)
    : QObject(mainWindow)
    , m_mainWindow(mainWindow)
{
    m_maskLayer = new MaskLayer(m_mainWindow);
    // m_maskLayer->setStyleSheet("background:rgba(112,128,144,180);");
    // m_maskLayer->hide();
    m_mainWindow->installEventFilter(this); //在Qt中，时间过滤会按照install的顺序反向执行，过程中，对于同一类型事件，任何一个过滤器返回true，表示事件被处理，后续过滤器和事件函数不会再被调用
}

bool MaskManager::eventFilter(QObject* obj, QEvent* event)
{
    if(obj == m_mainWindow && event->type() == QEvent::Resize)
    {
        if(m_maskLayer && m_maskLayer->isVisible())
            m_maskLayer->setGeometry(m_mainWindow->rect());
    }
    return QObject::eventFilter(obj, event);
}

void MaskManager::showMask(QWidget* requester)
{
    if(m_activeRequests.isEmpty())
    {
        m_maskLayer->setGeometry(m_mainWindow->rect());
        m_maskLayer->show();
        // foreach (QObject* child, m_mainWindow->children())
        // {
        //     if(qobject_cast<QDialog*>(child) || qobject_cast<QWidget*>(child))
        //         qDebug() << child->objectName();
        // }
    }
    else
    {
        QWidget* widget = m_activeRequests.last();
        const QMetaObject* meta = widget->metaObject();
        int methodIndex = meta->indexOfMethod("showMask()");
        if(methodIndex != -1)
        {
            //QMetaMethod method = meta->method(methodIndex);
            QMetaObject::invokeMethod(widget, "showMask", Qt::AutoConnection);
        }

        /*if(widget->parentWidget() == m_mainWindow && widget->isVisible() && !widget->isModal())
        {
            // qDebug() << "Child Dialog Order:";
            // foreach (QObject* child, m_mainWindow->children())
            // {
            //     if(qobject_cast<QDialog*>(child) || qobject_cast<QWidget*>(child))
            //         qDebug() << child->objectName();
            // }

            widget->stackUnder(m_maskLayer);
            //widget->lower();
            //强制刷新
            //m_mainWindow->update();
            //QApplication::processEvents();
        }*/
    }

    m_activeRequests.appendUnique(requester);
    //qDebug() << "append requester: " << requester->objectName() << "requester count: " << m_activeRequests.size();
}

void MaskManager::hideMask(QWidget* requester)
{
    m_activeRequests.remove(requester);
    if(m_activeRequests.isEmpty())
        m_maskLayer->hide();
    else
    {
        QWidget* widget = m_activeRequests.last();
        const QMetaObject* meta = widget->metaObject();
        int methodIndex = meta->indexOfMethod("hideMask()");
        if(methodIndex != -1)
            QMetaObject::invokeMethod(widget, "hideMask", Qt::AutoConnection);
        widget->setFocus();
    }

    //qDebug() << "remove requester: " << requester->objectName() << "requester count: " << m_activeRequests.size();
}