/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#include "QskObjectTree.h"
#include <QQuickWindow>
#include <QQuickItem>
#include <QGuiApplication>

bool QskObjectTree::isRoot( const QObject* object )
{
    return object == QGuiApplication::instance();
}

QObjectList QskObjectTree::childNodes( const QObject* object )
{
    QObjectList children;

    if ( object == nullptr )
    {
        for ( QWindow* window : QGuiApplication::topLevelWindows() )
            children += window;
    }
    else if ( object->isWindowType() )
    {
        const auto childObjects = object->children();

        for ( QObject* child : childObjects  )
        {
            if ( child->isWindowType() )
            {
                children += child;
            }
            else if ( qobject_cast< QQuickItem* >( child ) )
            {
                children += child;
            }
        }
    }
    else
    {
        const QQuickItem* item = static_cast< const QQuickItem* >( object );

        const auto childItems = item->childItems();
        for ( QQuickItem* child : childItems )
            children += child;
    }

    return children;
}

QObject* QskObjectTree::parentNode( const QObject* object )
{
    if ( object == nullptr )
        return nullptr;

    if ( object->isWindowType() )
    {
        QObject* parentObject = object->parent();
        if ( parentObject == nullptr )
            return QGuiApplication::instance();

    }

    if ( const QQuickItem* item = qobject_cast< const QQuickItem* >( object ) )
    {
        if ( item->parentItem() )
            return item->parentItem();

        return item->window();
    }

    return object->parent();
}

void QskObjectTree::traverseDown( QObject* object, Visitor& visitor )
{
    const auto children = childNodes( object );
    for ( QObject* child : children )
    {
        const bool done = visitor.visitDown( child );
        if ( !done )
            traverseDown( child, visitor );
    }
}

void QskObjectTree::traverseUp( QObject* object, Visitor& visitor )
{
    QObject* parent = parentNode( object );
    if ( parent )
    {
        const bool done = visitor.visitUp( parent );
        if ( !done )
            traverseUp( parent, visitor );
    }
}