/*************************************************************************
 * Copyright (C) 2014 by Hugo Pereira Da Costa <hugo.pereira@free.fr>    *
 * Copyright (C) 2019 Jan Grulich <jgrulich@redhat.com>                  *
 *                                                                       *
 * This program is free software; you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation; either version 2 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * This program is distributed in the hope that it will be useful,       *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 * GNU General Public License for more details.                          *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program; if not, write to the                         *
 * Free Software Foundation, Inc.,                                       *
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 *************************************************************************/

#include "adwaitawidgetexplorer.h"

#include "adwaita.h"
#include "adwaitadebug.h"

#include <QTextStream>
#include <QApplication>
#include <QMouseEvent>
#include <QPainter>

Q_LOGGING_CATEGORY(ADWAITA, "adwaita.widgetexplorer")

namespace Adwaita
{

//________________________________________________
WidgetExplorer::WidgetExplorer(QObject *parent)
    : QObject(parent)
    , _enabled(false)
    , _drawWidgetRects(false)
{
    _eventTypes.insert(QEvent::Enter, QStringLiteral("Enter"));
    _eventTypes.insert(QEvent::Leave, QStringLiteral("Leave"));

    _eventTypes.insert(QEvent::HoverMove, QStringLiteral("HoverMove"));
    _eventTypes.insert(QEvent::HoverEnter, QStringLiteral("HoverEnter"));
    _eventTypes.insert(QEvent::HoverLeave, QStringLiteral("HoverLeave"));

    _eventTypes.insert(QEvent::MouseMove, QStringLiteral("MouseMove"));
    _eventTypes.insert(QEvent::MouseButtonPress, QStringLiteral("MouseButtonPress"));
    _eventTypes.insert(QEvent::MouseButtonRelease, QStringLiteral("MouseButtonRelease"));

    _eventTypes.insert(QEvent::FocusIn, QStringLiteral("FocusIn"));
    _eventTypes.insert(QEvent::FocusOut, QStringLiteral("FocusOut"));

    // _eventTypes.insert( QEvent::Paint, "Paint" );
}

//________________________________________________
void WidgetExplorer::setEnabled(bool value)
{
    if (value == _enabled) {
        return;
    }

    _enabled = value;

    qApp->removeEventFilter(this);
    if (_enabled) {
        qApp->installEventFilter(this);
    }
}

//________________________________________________
bool WidgetExplorer::eventFilter(QObject *object, QEvent *event)
{

//         if( object->isWidgetType() )
//         {
//             QString type( _eventTypes[event->type()] );
//             if( !type.isEmpty() )
//             {
//                 QTextStream( stdout ) << "Adwaita::WidgetExplorer::eventFilter - widget: " << object << " (" << object->metaObject()->className() << ")";
//                 QTextStream( stdout ) << " type: " << type  << endl;
//             }
//         }

    switch (event->type()) {
    case QEvent::Paint:
        if (_drawWidgetRects) {
            QWidget *widget(qobject_cast<QWidget *>(object));
            if (!widget)
                return false;

            QPainter painter(widget);
            painter.setRenderHints(QPainter::Antialiasing);
            painter.setBrush(Qt::NoBrush);
            painter.setPen(Qt::red);
            painter.drawRect(widget->rect());
            painter.end();
        }
        break;

    case QEvent::MouseButtonPress: {
        // cast event and check button
        QMouseEvent *mouseEvent(static_cast<QMouseEvent *>(event));
        if (mouseEvent->button() != Qt::LeftButton) {
            break;
        }

        // case widget and check (should not be necessary)
        QWidget *widget(qobject_cast<QWidget *>(object));
        if (!widget) {
            return false;
        }

        qCDebug(ADWAITA)
                << "Adwaita::WidgetExplorer::eventFilter -"
                << " event: " << event << " type: " << eventType(event->type())
                << " widget: " << widgetInformation(widget);

        // print parent information
        QWidget *parent(widget->parentWidget());
        while (parent) {
            qCDebug(ADWAITA)
                    << "    parent: " << widgetInformation(parent);
            parent = parent->parentWidget();
        }
    }
    break;

    default:
        break;

    }

    // always return false to go on with normal chain
    return false;
}

//________________________________________________
QString WidgetExplorer::eventType(const QEvent::Type &type) const
{
    switch (type) {
    case QEvent::MouseButtonPress:
        return QStringLiteral("MouseButtonPress");
    case QEvent::MouseButtonRelease:
        return QStringLiteral("MouseButtonRelease");
    case QEvent::MouseMove:
        return QStringLiteral("MouseMove");
    default:
        return QStringLiteral("Unknown");
    }
}

//________________________________________________
QString WidgetExplorer::widgetInformation(const QWidget *widget) const
{
    QRect r(widget->geometry());
    const char *className(widget->metaObject()->className());
    QString out;
    QTextStream(&out) << widget << " (" << className << ")"
                      << " position: " << r.x() << "," << r.y()
                      << " size: " << r.width() << "," << r.height()
                      << " sizeHint: " << widget->sizeHint().width() << "," << widget->sizeHint().height()
                      << " minimumSizeHint: " << widget->minimumSizeHint().width() << "," << widget->minimumSizeHint().height()
                      << " hover: " << widget->testAttribute(Qt::WA_Hover);

    return out;
}

} // namespace Adwaita