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#include "qqmlaspectengine_p.h"
#include <QQmlComponent>
#include <QQmlContext>
#include <QDebug>
#include <Qt3DCore/qentity.h>

QT_BEGIN_NAMESPACE

namespace Qt3DCore {
namespace Quick {

/*!
    \class Qt3DCore::Quick::QQmlAspectEnginePrivate
    \internal
*/
QQmlAspectEnginePrivate::QQmlAspectEnginePrivate()
    : QObjectPrivate()
    , m_qmlEngine(new QQmlEngine())
    , m_aspectEngine(new QAspectEngine())
    , m_component(Q_NULLPTR)
{
}

QQmlAspectEngine::QQmlAspectEngine(QObject *parent)
    : QObject(*new QQmlAspectEnginePrivate, parent)
{
}

QQmlAspectEngine::Status QQmlAspectEngine::status() const
{
    Q_D(const QQmlAspectEngine);

    if (!d->m_component)
        return Null;

    return Status(d->m_component->status());
}

void QQmlAspectEngine::setSource(const QUrl &source)
{
    Q_D(QQmlAspectEngine);

    if (d->m_component) {
        d->m_aspectEngine->setRootEntity(Q_NULLPTR);
        d->m_component = Q_NULLPTR;
    }

    if (!source.isEmpty()) {
        d->m_component = new QQmlComponent(d->m_qmlEngine.data(), source);
        if (!d->m_component->isLoading()) {
            d->_q_continueExecute();
        } else {
            QObject::connect(d->m_component, SIGNAL(statusChanged(QQmlComponent::Status)),
                             this, SLOT(_q_continueExecute()));
        }
    }
}

QQmlEngine *QQmlAspectEngine::qmlEngine() const
{
    Q_D(const QQmlAspectEngine);
    return d->m_qmlEngine.data();
}

QAspectEngine *QQmlAspectEngine::aspectEngine() const
{
    Q_D(const QQmlAspectEngine);
    return d->m_aspectEngine.data();
}

void QQmlAspectEnginePrivate::_q_continueExecute()
{
    Q_Q(QQmlAspectEngine);

    QObject::disconnect(m_component, SIGNAL(statusChanged(QQmlComponent::Status)),
                        q, SLOT(_q_continueExecute()));

    if (m_component->isError()) {
        QList<QQmlError> errorList = m_component->errors();
        Q_FOREACH ( const QQmlError& error, errorList ) {
            QMessageLogger(error.url().toString().toLatin1().constData(), error.line(), 0).warning()
                << error;
        }
        emit q->statusChanged(q->status());
        return;
    }

    QObject* obj = m_component->create();

    if (m_component->isError()) {
        QList<QQmlError> errorList = m_component->errors();
        Q_FOREACH ( const QQmlError& error, errorList ) {
            QMessageLogger(error.url().toString().toLatin1().constData(), error.line(), 0).warning()
                << error;
        }
        emit q->statusChanged(q->status());
        return;
    }

    // Let users know we have loaded the QML file, and the scene has been instantiated.
    // This gives a chance to manipulate the scene before passing it over to the
    // aspect engine. Useful for convenience window classes to set up cameras and surfaces
    // on the framegraph and event sources for the input aspect etc.
    emit q->sceneCreated(obj);
    m_aspectEngine->setRootEntity(qobject_cast<QEntity *>(obj));
    emit q->statusChanged(q->status());
}

} // namespace Quick
} // namespace Qt3DCore

QT_END_NAMESPACE

#include "moc_qqmlaspectengine.cpp"