/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the QtQuick1 module of the Qt Toolkit.
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** This file may be used under the terms of the GNU Lesser General Public
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** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
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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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** 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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**
****************************************************************************/

#include "private/qdeclarativeinspectorservice_p.h"
#include "private/qdeclarativeinspectorinterface_p.h"

#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QDir>
#include <QtCore/QPluginLoader>

#include <QtQuick1/QDeclarativeView>

QT_BEGIN_NAMESPACE

Q_GLOBAL_STATIC(QDeclarativeInspectorService, serviceInstance)

QDeclarativeInspectorService::QDeclarativeInspectorService()
    : QDeclarativeDebugService(QLatin1String("QDeclarativeObserverMode"))
    , m_inspectorPlugin(0)
{
}

QDeclarativeInspectorService *QDeclarativeInspectorService::instance()
{
    return serviceInstance();
}

void QDeclarativeInspectorService::addView(QDeclarativeView *view)
{
    m_views.append(view);
    updateStatus();
}

void QDeclarativeInspectorService::removeView(QDeclarativeView *view)
{
    m_views.removeAll(view);
    updateStatus();
}

void QDeclarativeInspectorService::sendMessage(const QByteArray &message)
{
    if (status() != Enabled)
        return;

    QDeclarativeDebugService::sendMessage(message);
}

void QDeclarativeInspectorService::statusChanged(Status status)
{
    Q_UNUSED(status)
    updateStatus();
}

void QDeclarativeInspectorService::updateStatus()
{
    if (m_views.isEmpty()) {
        if (m_inspectorPlugin)
            m_inspectorPlugin->deactivate();
        return;
    }

    if (status() == Enabled) {
        if (!m_inspectorPlugin)
            m_inspectorPlugin = loadInspectorPlugin();

        if (!m_inspectorPlugin) {
            qWarning() << "Error while loading inspector plugin";
            return;
        }

        m_inspectorPlugin->activate();
    } else {
        if (m_inspectorPlugin)
            m_inspectorPlugin->deactivate();
    }
}

void QDeclarativeInspectorService::messageReceived(const QByteArray &message)
{
    emit gotMessage(message);
}

QDeclarativeInspectorInterface *QDeclarativeInspectorService::loadInspectorPlugin()
{
    QStringList pluginCandidates;
    const QStringList paths = QCoreApplication::libraryPaths();
    foreach (const QString &libPath, paths) {
        const QDir dir(libPath + QLatin1String("/qmltooling"));
        if (dir.exists())
            foreach (const QString &pluginPath, dir.entryList(QDir::Files))
                pluginCandidates << dir.absoluteFilePath(pluginPath);
    }

    foreach (const QString &pluginPath, pluginCandidates) {
        QPluginLoader loader(pluginPath);
        if (!loader.load())
            continue;

        QDeclarativeInspectorInterface *inspector =
                qobject_cast<QDeclarativeInspectorInterface*>(loader.instance());

        if (inspector)
            return inspector;
        loader.unload();
    }
    return 0;
}

QT_END_NAMESPACE