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**
** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of Qt Creator.
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#include "qmlstatenodeinstance.h"

#include <private/qdeclarativestategroup_p.h>

#include "qmlpropertychangesnodeinstance.h"
#include <private/qdeclarativestateoperations_p.h>

namespace QmlDesigner {
namespace Internal {

/**
  \class QmlStateNodeInstance

  QmlStateNodeInstance manages a QDeclarativeState object.
  */

QmlStateNodeInstance::QmlStateNodeInstance(QDeclarativeState *object) :
        ObjectNodeInstance(object)
{
}

QmlStateNodeInstance::Pointer
        QmlStateNodeInstance::create(QObject *object)
{
    QDeclarativeState *stateObject = qobject_cast<QDeclarativeState*>(object);

    Q_ASSERT(stateObject);

    Pointer instance(new QmlStateNodeInstance(stateObject));

    instance->populateResetHashes();

    return instance;
}

void QmlStateNodeInstance::activateState()
{
    if (stateGroup()
            && !isStateActive()
            && nodeInstanceServer()->hasInstanceForObject(object())) {
        nodeInstanceServer()->setStateInstance(nodeInstanceServer()->instanceForObject(object()));
        stateGroup()->setState(property("name").toString());
    }
}

void QmlStateNodeInstance::deactivateState()
{
    if (stateGroup()) {
        if (isStateActive()) {
            nodeInstanceServer()->clearStateInstance();
            stateGroup()->setState(QString());
        }
    }
}

QDeclarativeState *QmlStateNodeInstance::stateObject() const
{
    Q_ASSERT(object());
    Q_ASSERT(qobject_cast<QDeclarativeState*>(object()));
    return static_cast<QDeclarativeState*>(object());
}

QDeclarativeStateGroup *QmlStateNodeInstance::stateGroup() const
{
    return stateObject()->stateGroup();
}

bool QmlStateNodeInstance::isStateActive() const
{
    return stateObject() && stateGroup() && stateGroup()->state() == property("name");
}

void QmlStateNodeInstance::setPropertyVariant(const PropertyName &name, const QVariant &value)
{
    bool hasParent = parent();
    bool isStateOfTheRootModelNode = parentInstance() && parentInstance()->isRootNodeInstance();
    if (name == "when" && (!hasParent || isStateOfTheRootModelNode))
        return;

    ObjectNodeInstance::setPropertyVariant(name, value);
}

void QmlStateNodeInstance::setPropertyBinding(const PropertyName &name, const QString &expression)
{
    bool hasParent = parent();
    bool isStateOfTheRootModelNode = parentInstance() && parentInstance()->isRootNodeInstance();
    if (name == "when" && (!hasParent || isStateOfTheRootModelNode))
        return;

    ObjectNodeInstance::setPropertyBinding(name, expression);
}

bool QmlStateNodeInstance::updateStateVariant(const ObjectNodeInstance::Pointer &target, const PropertyName &propertyName, const QVariant &value)
{
    return stateObject()->changeValueInRevertList(target->object(), propertyName, value);
}

bool QmlStateNodeInstance::updateStateBinding(const ObjectNodeInstance::Pointer &target, const PropertyName &propertyName, const QString &expression)
{
    return stateObject()->changeValueInRevertList(target->object(), propertyName, expression);
}

bool QmlStateNodeInstance::resetStateProperty(const ObjectNodeInstance::Pointer &target, const PropertyName &propertyName, const QVariant & /* resetValue */)
{
    return stateObject()->removeEntryFromRevertList(target->object(), propertyName);
}

} // namespace Internal
} // namespace QmlDesigner
