/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** additional rights. These rights are described in the Nokia Qt LGPL
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
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****************************************************************************/

#include <qml.h>
#include "qmlbinding.h"
#include "qmlbinding_p.h"
#include <qmlcontext.h>
#include <qmlinfo.h>
#include <QVariant>
#include <private/qfxperf_p.h>
#include <QtCore/qdebug.h>
#include <private/qmlcontext_p.h>
#include <private/qmldeclarativedata_p.h>
#include <private/qmlstringconverters_p.h>

Q_DECLARE_METATYPE(QList<QObject *>);

QT_BEGIN_NAMESPACE

QML_DEFINE_NOCREATE_TYPE(QmlBinding);

QmlBindingPrivate::QmlBindingPrivate()
: updating(false), enabled(false)
{
}

QmlBinding::QmlBinding(void *data, QmlRefCount *rc, QObject *obj, QmlContext *ctxt, QObject *parent)
: QmlExpression(ctxt, data, rc, obj, *new QmlBindingPrivate)
{
    setParent(parent);
}

QmlBinding::QmlBinding(const QString &str, QObject *obj, QmlContext *ctxt, QObject *parent)
: QmlExpression(ctxt, str, obj, *new QmlBindingPrivate)
{
    setParent(parent);
}

QmlBinding::~QmlBinding()
{
}

void QmlBinding::setTarget(const QmlMetaProperty &prop)
{
    Q_D(QmlBinding);
    d->property = prop;

    update();
}

QmlMetaProperty QmlBinding::property() const 
{
   Q_D(const QmlBinding);
   return d->property; 
}

void QmlBinding::update()
{
    Q_D(QmlBinding);

#ifdef Q_ENABLE_PERFORMANCE_LOG
    QFxPerfTimer<QFxPerf::BindableValueUpdate> bu;
#endif
    if (!d->enabled)
        return;

    if (!d->updating) {
        d->updating = true;

        if (d->property.propertyCategory() == QmlMetaProperty::Bindable) {

            int idx = d->property.coreIndex();
            Q_ASSERT(idx != -1);

            void *a[1];
            QmlBinding *t = this;
            a[0] = (void *)&t;
            QMetaObject::metacall(d->property.object(), 
                                  QMetaObject::WriteProperty,
                                  idx, a);

        } else {

            QVariant value = this->value();
            if (value.type() == QVariant::String) {
                QmlMetaType::StringConverter con = QmlMetaType::customStringConverter(d->property.propertyType());
                if (con)
                    value = con(value.toString());
            }

            if (d->property.propertyType() == QVariant::Url && 
                (value.type() == QVariant::String || value.type() == QVariant::ByteArray) && !value.isNull()) 
                value.setValue(context()->resolvedUrl(QUrl(value.toString())));

            if (d->property.propertyType() == QVariant::Vector3D &&
                value.type() == QVariant::String) {
                value = qVariantFromValue(QmlStringConverters::vector3DFromString(value.toString()));
            }

            d->property.write(value);
        }

        d->updating = false;
    } else {
        qmlInfo(d->property.object()) << "Binding loop detected for property" << d->property.name();
    }
}

void QmlBinding::valueChanged()
{
    update();
}

void QmlBinding::setEnabled(bool e)
{
    Q_D(QmlBinding);
    d->enabled = e;
    setTrackChange(e);

    if (e) {
        addToObject(d->property.object());
        update();
    } else {
        removeFromObject();
    }

    QmlAbstractBinding::setEnabled(e);
}

int QmlBinding::propertyIndex()
{
    Q_D(QmlBinding);
    return d->property.coreIndex();
}

bool QmlBinding::enabled() const
{
    Q_D(const QmlBinding);

    return d->enabled;
}

QString QmlBinding::expression() const
{
    return QmlExpression::expression();
}

QmlAbstractBinding::QmlAbstractBinding()
: m_mePtr(0), m_prevBinding(0), m_nextBinding(0)
{
}

QmlAbstractBinding::~QmlAbstractBinding()
{
    removeFromObject();
    if (m_mePtr)
        *m_mePtr = 0;
}

void QmlAbstractBinding::addToObject(QObject *object)
{
    removeFromObject();

    if (object) {
        QmlDeclarativeData *data = QmlDeclarativeData::get(object, true);
        m_nextBinding = data->bindings;
        if (m_nextBinding) m_nextBinding->m_prevBinding = &m_nextBinding;
        m_prevBinding = &data->bindings;
        data->bindings = this;
    }
}

void QmlAbstractBinding::removeFromObject()
{
    if (m_prevBinding) {
        *m_prevBinding = m_nextBinding;
        if (m_nextBinding) m_nextBinding->m_prevBinding = m_prevBinding;
        m_prevBinding = 0;
        m_nextBinding = 0;
    }
}

QString QmlAbstractBinding::expression() const
{
    return QLatin1String("<Unknown>");
}

void QmlAbstractBinding::setEnabled(bool e)
{
    if (e) m_mePtr = 0;
}

QT_END_NAMESPACE