/****************************************************************************
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** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
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** This file is part of the Qt3D module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU
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****************************************************************************/

#include "manager_p.h"
#include "qlogicaspect.h"
#include <Qt3DLogic/private/executor_p.h>
#include <Qt3DLogic/private/managers_p.h>
#include <QtCore/qcoreapplication.h>

#include <QDebug>
#include <QThread>

QT_BEGIN_NAMESPACE

namespace Qt3DLogic {
namespace Logic {

Manager::Manager()
    : m_logicHandlerManager(new HandlerManager)
    , m_semaphore(1)
{
    m_semaphore.acquire();
}

Manager::~Manager()
{
}

void Manager::setExecutor(Executor *executor)
{
    m_executor = executor;
    if (m_executor)
        m_executor->setSemephore(&m_semaphore);
}

void Manager::appendHandler(Handler *handler)
{
    HHandler handle = m_logicHandlerManager->lookupHandle(handler->peerUuid());
    m_logicHandlers.append(handle);
    m_logicComponentIds.append(handler->peerUuid());
}

void Manager::removeHandler(const Qt3D::QNodeId &id)
{
    HHandler handle = m_logicHandlerManager->lookupHandle(id);
    m_logicComponentIds.removeAll(id);
    m_logicHandlers.removeAll(handle);
    m_logicHandlerManager->releaseResource(id);
}

void Manager::triggerLogicFrameUpdates()
{
    Q_ASSERT(m_executor);

    // Don't use blocking queued connections to main thread if it is already
    // in the process of shutting down as that will deadlock.
    if (m_logicAspect->isShuttingDown())
        return;

    // Trigger the main thread to process logic frame updates for each
    // logic component and then wait until done. The Executor will
    // release the semaphore when it has completed its work.
    m_executor->enqueueLogicFrameUpdates(m_logicComponentIds);
    qApp->postEvent(m_executor, new FrameUpdateEvent);
    m_semaphore.acquire();
}

} // namespace Logic
} // namespace Qt3DLogic

QT_END_NAMESPACE