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#include "qmousehandler.h"
#include "qmousehandler_p.h"
#include "qmousecontroller.h"
#include "qmouseevent.h"
#include <Qt3DCore/qbackendscenepropertychange.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace Qt3DInput {
/*! \internal */
QMouseHandlerPrivate::QMouseHandlerPrivate()
    : QComponentPrivate()
    , m_sourceDevice(Q_NULLPTR)
    , m_containsMouse(false)
{
    m_shareable = false;
}

void QMouseHandlerPrivate::mouseEvent(QMouseEvent *event)
{
    Q_Q(QMouseHandler);
    switch (event->type()) {
    case QEvent::MouseButtonPress:
        if (event->wasHeld())
            emit q->pressAndHold(event);
        else
            emit q->pressed(event);
        break;
    case QEvent::MouseButtonRelease:
        emit q->released(event);
        break;
    case Qt::TapGesture:
        emit q->clicked(event);
        break;
    case QEvent::MouseButtonDblClick:
        emit q->doubleClicked(event);
        break;
    case QEvent::MouseMove:
        emit q->positionChanged(event);
        break;
    default:
        break;
    }
}

/*!
 * \qmltype MouseHandler
 * \instantiates Qt3DInput::QMouseHandler
 * \inqmlmodule Qt3D.Input
 * \since 5.5
 * \brief Provides mouse event notification
 *
 * \TODO
 * \sa MouseController
 */

/*!
 * \class Qt3DInput::QMouseHandler
 * \inmodule Qt3DInput
 *
 * \brief Provides a means of being notified about mouse events when attached to
 * a QMouseController instance.
 *
 * \since 5.5
 *
 * \note QMouseHandler components shouldn't be shared, not respecting that
 * condition will most likely result in undefined behaviors.
 *
 * \sa QMouseController
 */

/*!
 * Constructs a new QMouseHandler instance with parent \a parent.
 */
QMouseHandler::QMouseHandler(QNode *parent)
    : QComponent(*new QMouseHandlerPrivate, parent)
{
}

/*!
   Destroys this QMouseHandler object
*/
QMouseHandler::~QMouseHandler()
{
    QNode::cleanup();
}

/*!
 * Sets the mouse source device of the QMouseHandler instance to \a sourceDevice.
 */
void QMouseHandler::setSourceDevice(QMouseController *sourceDevice)
{
    Q_D(QMouseHandler);
    if (d->m_sourceDevice != sourceDevice) {
        d->m_sourceDevice = sourceDevice;
        emit sourceDeviceChanged(sourceDevice);
    }
}

/*!
 * Returns the current mouse source device of the QMouseHandler instance.
 */
QMouseController *QMouseHandler::sourceDevice() const
{
    Q_D(const QMouseHandler);
    return d->m_sourceDevice;
}

/*!
 * Returns \c true if the QMouseHandler currently contains the mouse.
 *
 * \note In this context, contains mean that the ray originating from the
 * mouse is intersecting with the Qt3DCore::QEntity that aggregates the current
 * QMouseHandler instance component.
 */
bool QMouseHandler::containsMouse() const
{
    Q_D(const QMouseHandler);
    return d->m_containsMouse;
}

void QMouseHandler::setContainsMouse(bool contains)
{
    Q_D(QMouseHandler);
    if (contains != d->m_containsMouse) {
        d->m_containsMouse = contains;
        emit containsMouseChanged(contains);
    }
}

void QMouseHandler::copy(const QNode *ref)
{
    Q_D(QMouseHandler);
    const QMouseHandler *refInput = static_cast<const QMouseHandler *>(ref);
    d->m_containsMouse = refInput->containsMouse();

    // TODO: We may want to store the controller id and only send a clone when we are the parent
    // of the controller.
    // Perhaps it's time to investigate sending a "kernel" or "seed" over to the backend rather
    // than a complete clone.
    if (refInput && refInput->sourceDevice() && refInput->sourceDevice()->parent() == ref)
        d->m_sourceDevice = static_cast<QMouseController *>(QNode::clone(refInput->sourceDevice()));
}

void QMouseHandler::sceneChangeEvent(const Qt3DCore::QSceneChangePtr &change)
{
    Q_D(QMouseHandler);
    QBackendScenePropertyChangePtr e = qSharedPointerCast<QBackendScenePropertyChange>(change);
    if (e->type() == NodeUpdated) {
        if (e->propertyName() == QByteArrayLiteral("mouse")) {
            QMouseEventPtr ev = e->value().value<QMouseEventPtr>();
            d->mouseEvent(ev.data());
        } else if (e->propertyName() == QByteArrayLiteral("wheel")) {
            QWheelEventPtr ev = e->value().value<QWheelEventPtr>();
            emit wheel(ev.data());
        }
    }
}

} // namespace Qt3DInput

QT_END_NAMESPACE