/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** Contact: http://www.qt-project.org/legal
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** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
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****************************************************************************/

#include "executor_p.h"
#include <Qt3DLogic/qlogiccomponent.h>
#include <Qt3DCore/qnode.h>
#include <Qt3DCore/private/qscene_p.h>
#include <QtCore/qsemaphore.h>

QT_BEGIN_NAMESPACE

using namespace Qt3D;

namespace Qt3DLogic {
namespace Logic {

Executor::Executor(QObject *parent)
    : QObject(parent)
    , m_scene(Q_NULLPTR)
{
}

void Executor::clearQueueAndProceed()
{
    // Clear the queue of nodes to process frame updates for (throw the work away).
    // If the semaphore is acquired, release it to allow the logic job and hence the
    // manager and frame to complete and shutdown to continue.
    m_nodeIds.clear();
    if (m_semaphore->available() == 0)
        m_semaphore->release();
}

void Executor::enqueueLogicFrameUpdates(const QVector<Qt3D::QNodeId> &nodeIds)
{
    m_nodeIds = nodeIds;
}

bool Executor::event(QEvent *e)
{
    if (e->type() == QEvent::User) {
        processLogicFrameUpdates();
        e->setAccepted(true);
        return true;
    }
    return false;
}

/*!
   \internal

   Called from context of main thread
*/
void Executor::processLogicFrameUpdates()
{
    Q_ASSERT(m_scene);
    Q_ASSERT(m_semaphore);
    QVector<QNode *> nodes = m_scene->lookupNodes(m_nodeIds);
    foreach (QNode *node, nodes) {
        QLogicComponent *logicComponent = qobject_cast<QLogicComponent *>(node);
        if (logicComponent)
            logicComponent->onFrameUpdate();
    }

    // Release the semaphore so the calling Manager can continue
    m_semaphore->release();
}

} // namespace Logic
} // namespace Qt3D

QT_END_NAMESPACE