/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbackendnode.h"
#include "qbackendnode_p.h"

#include <Qt3DCore/qaspectengine.h>
#include <Qt3DCore/qnode.h>
#include <Qt3DCore/qnodecommand.h>
#include <Qt3DCore/qpropertyupdatedchange.h>

#include <Qt3DCore/private/corelogging_p.h>

QT_BEGIN_NAMESPACE

namespace Qt3DCore {

/*! \internal */
QBackendNodeMapper::~QBackendNodeMapper()
{
}

QBackendNodePrivate::QBackendNodePrivate(QBackendNode::Mode mode)
    : q_ptr(nullptr)
    , m_mode(mode)
    , m_arbiter(nullptr)
    , m_enabled(false)
{
}

// Called by backend thread (renderer or other) while we are locked to sync changes
void QBackendNodePrivate::setArbiter(QLockableObserverInterface *arbiter)
{
    Q_ASSERT(m_mode == QBackendNode::ReadWrite);
    m_arbiter = arbiter;
}

// Called by backend thread/worker threads. We don't need locking
// as setting/unsetting the arbiter cannot happen at that time
void QBackendNodePrivate::notifyObservers(const QSceneChangePtr &e)
{
    Q_ASSERT(m_mode == QBackendNode::ReadWrite);
    if (m_arbiter != nullptr)
        m_arbiter->sceneChangeEvent(e);
}

void QBackendNodePrivate::sceneChangeEvent(const QSceneChangePtr &e)
{
    q_func()->sceneChangeEvent(e);
}

void QBackendNodePrivate::setEnabled(bool enabled)
{
    m_enabled = enabled;
}

QBackendNodePrivate *QBackendNodePrivate::get(QBackendNode *n)
{
    return n->d_func();
}

/*!
 * \class Qt3DCore::QBackendNodeMapper
 * \inheaderfile Qt3DCore/QBackendNodeMapper
 * \inmodule Qt3DCore
 *
 * \brief Creates and maps backend nodes to their respective frontend nodes.
 */

/*!
 * \fn Qt3DCore::QBackendNode *Qt3DCore::QBackendNodeMapper::create(const Qt3DCore::QNodeCreatedChangeBasePtr &change) const
 *
 * \TODO
 *
 * \a change
 *
 * \return created node.
 */

/*!
 * \fn Qt3DCore::QBackendNode * Qt3DCore::QBackendNodeMapper::get(Qt3DCore::QNodeId id) const
 *
 * \return backend node for the given node \a id.
 */

/*!
 * \fn void Qt3DCore::QBackendNodeMapper::destroy(Qt3DCore::QNodeId id) const
 *
 * Destroys the backend node for the given node \a id.
 */

/*!
 * \class Qt3DCore::QBackendNode
 * \inheaderfile Qt3DCore/QBackendNode
 * \inmodule Qt3DCore
 *
 * \brief The base class for all Qt3D backend nodes.
 */

/*!
 * \enum Qt3DCore::QBackendNode::Mode
 *
 * The mode for the backend node.
 *
 * \value ReadOnly
 * \value ReadWrite
 */

QBackendNode::QBackendNode(QBackendNode::Mode mode)
    : d_ptr(new QBackendNodePrivate(mode))
{
    d_ptr->q_ptr = this;
}

QBackendNode::~QBackendNode()
{
    delete d_ptr;
}

/*!
 * Sets the peer \a id.
 */
void QBackendNode::setPeerId(QNodeId id) Q_DECL_NOTHROW
{
    Q_D(QBackendNode);
    d->m_peerId = id;
}

/*!
 * \return the peer id of the backend node.
 */
QNodeId QBackendNode::peerId() const Q_DECL_NOTHROW
{
    Q_D(const QBackendNode);
    return d->m_peerId;
}

/*!
 * \return \c true if the backend node is enabled.
 */
bool QBackendNode::isEnabled() const Q_DECL_NOTHROW
{
    Q_D(const QBackendNode);
    return d->m_enabled;
}

/*!
 * \return the mode of the backend mode.
 */
QBackendNode::Mode QBackendNode::mode() const Q_DECL_NOTHROW
{
    Q_D(const QBackendNode);
    return d->m_mode;
}

/*!
 * \internal
 */
QBackendNode::QBackendNode(QBackendNodePrivate &dd)
    : d_ptr(&dd)
{
    d_ptr->q_ptr = this;
}

/*!
 * Notifies observers of scene change \a e.
 */
void QBackendNode::notifyObservers(const QSceneChangePtr &e)
{
    Q_D(QBackendNode);
    d->notifyObservers(e);
}

QNodeCommand::CommandId QBackendNode::sendCommand(const QString &name,
                                                  const QVariant &data,
                                                  QNodeCommand::CommandId replyTo)
{
    auto e = QNodeCommandPtr::create(peerId());
    e->setName(name);
    e->setData(data);
    e->setReplyToCommandId(replyTo);
    e->setDeliveryFlags(QSceneChange::Nodes);
    notifyObservers(e);
    return e->commandId();
}

void QBackendNode::sendReply(const QNodeCommandPtr &command)
{
    command->setDeliveryFlags(QSceneChange::Nodes);
    notifyObservers(command);
}

void QBackendNode::initializeFromPeer(const QNodeCreatedChangeBasePtr &change)
{
    Q_UNUSED(change);
    qCDebug(Nodes) << Q_FUNC_INFO << change->metaObject()->className() << "does not override";
}

/*!
 * Enables or disables the backend node by \a enabled.
 */
void QBackendNode::setEnabled(bool enabled) Q_DECL_NOTHROW
{
    Q_D(QBackendNode);
    d->m_enabled = enabled;
}

/*!
 * TODO
 * \a e
 */
void QBackendNode::sceneChangeEvent(const QSceneChangePtr &e)
{
    Q_D(QBackendNode);
    auto propertyChange = qSharedPointerCast<QPropertyUpdatedChange>(e);

    switch (e->type()) {
        case PropertyUpdated: {
            if (propertyChange->propertyName() == QByteArrayLiteral("enabled"))
                d->m_enabled = propertyChange->value().toBool();
            break;
        }
        default:
            break;
    }
}

} // Qt3D

QT_END_NAMESPACE
