/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
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** This file is part of the Qt3D module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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****************************************************************************/

#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);
}

/*!
    Send the command named \a name with contents \a data,
    and specify \a replyTo as the command id to which the
    reply needs to be sent.
*/
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();
}

/*!
    Send the reply to \a command.
*/
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
