/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtDeclarative module of the Qt Toolkit.
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** GNU Lesser General Public License Usage
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** 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
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** 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:
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**
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** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qdeclarativewatcher_p.h"

#include "qdeclarativeexpression.h"
#include "qdeclarativecontext.h"
#include "qdeclarative.h"

#include <qdeclarativedebugservice_p.h>
#include "private/qdeclarativeproperty_p.h"

#include <QtCore/qmetaobject.h>
#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE


class QDeclarativeWatchProxy : public QObject
{
    Q_OBJECT
public:
    QDeclarativeWatchProxy(int id,
                  QObject *object,
                  int debugId,
                  const QMetaProperty &prop,
                  QDeclarativeWatcher *parent = 0);

    QDeclarativeWatchProxy(int id,
                  QDeclarativeExpression *exp,
                  int debugId,
                  QDeclarativeWatcher *parent = 0);

public slots:
    void notifyValueChanged();

private:
    friend class QDeclarativeWatcher;
    int m_id;
    QDeclarativeWatcher *m_watch;
    QObject *m_object;
    int m_debugId;
    QMetaProperty m_property;

    QDeclarativeExpression *m_expr;
};

QDeclarativeWatchProxy::QDeclarativeWatchProxy(int id,
                             QDeclarativeExpression *exp,
                             int debugId,
                             QDeclarativeWatcher *parent)
: QObject(parent), m_id(id), m_watch(parent), m_object(0), m_debugId(debugId), m_expr(exp)
{
    QObject::connect(m_expr, SIGNAL(valueChanged()), this, SLOT(notifyValueChanged()));
}

QDeclarativeWatchProxy::QDeclarativeWatchProxy(int id,
                             QObject *object,
                             int debugId,
                             const QMetaProperty &prop,
                             QDeclarativeWatcher *parent)
: QObject(parent), m_id(id), m_watch(parent), m_object(object), m_debugId(debugId), m_property(prop), m_expr(0)
{
    static int refreshIdx = -1;
    if(refreshIdx == -1)
        refreshIdx = QDeclarativeWatchProxy::staticMetaObject.indexOfMethod("notifyValueChanged()");

    if (prop.hasNotifySignal())
        QDeclarativePropertyPrivate::connect(m_object, prop.notifySignalIndex(), this, refreshIdx);
}

void QDeclarativeWatchProxy::notifyValueChanged()
{
    QVariant v;
    if (m_expr)
        v = m_expr->evaluate();
    else
        v = m_property.read(m_object);

    emit m_watch->propertyChanged(m_id, m_debugId, m_property, v);
}


QDeclarativeWatcher::QDeclarativeWatcher(QObject *parent)
    : QObject(parent)
{
}

bool QDeclarativeWatcher::addWatch(int id, quint32 debugId)
{
    QObject *object = QDeclarativeDebugService::objectForId(debugId);
    if (object) {
        int propCount = object->metaObject()->propertyCount();
        for (int ii=0; ii<propCount; ii++)
            addPropertyWatch(id, object, debugId, object->metaObject()->property(ii));
        return true;
    }
    return false;
}

bool QDeclarativeWatcher::addWatch(int id, quint32 debugId, const QByteArray &property)
{
    QObject *object = QDeclarativeDebugService::objectForId(debugId);
    if (object) {
        int index = object->metaObject()->indexOfProperty(property.constData());
        if (index >= 0) {
            addPropertyWatch(id, object, debugId, object->metaObject()->property(index));
            return true;
        }
    }
    return false;
}

bool QDeclarativeWatcher::addWatch(int id, quint32 objectId, const QString &expr)
{
    QObject *object = QDeclarativeDebugService::objectForId(objectId);
    QDeclarativeContext *context = qmlContext(object);
    if (context) {
        QDeclarativeExpression *exprObj = new QDeclarativeExpression(context, object, expr);
        exprObj->setNotifyOnValueChanged(true);
        QDeclarativeWatchProxy *proxy = new QDeclarativeWatchProxy(id, exprObj, objectId, this);
        exprObj->setParent(proxy);
        m_proxies[id].append(proxy);
        proxy->notifyValueChanged();
        return true;
    }
    return false;
}

void QDeclarativeWatcher::removeWatch(int id)
{
    if (!m_proxies.contains(id))
        return;

    QList<QPointer<QDeclarativeWatchProxy> > proxies = m_proxies.take(id);
    qDeleteAll(proxies);
}

void QDeclarativeWatcher::addPropertyWatch(int id, QObject *object, quint32 debugId, const QMetaProperty &property)
{
    QDeclarativeWatchProxy *proxy = new QDeclarativeWatchProxy(id, object, debugId, property, this);
    m_proxies[id].append(proxy);

    proxy->notifyValueChanged();
}

QT_END_NAMESPACE

#include <qdeclarativewatcher.moc>