/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#include <QPluginLoader>

#include <QtGui>

#include <cntuiextensionfactory.h>

#include "cntextensionmanager.h"

const char *CNT_UI_EXTENSION_PLUGIN_DIRECTORY = "/resource/qt/plugins/contacts/extensions/";

CntExtensionManager::CntExtensionManager( QObject* aParent ):

    mPluginsLoaded(false)

{

    setParent(aParent);

}

CntExtensionManager::~CntExtensionManager()

{

    unloadExtensionPlugins();

}

int CntExtensionManager::pluginCount()

{

    loadExtensionPlugins();

    return mPlugins.count();

}

CntUiExtensionFactory* CntExtensionManager::pluginAt( int index)

{

    loadExtensionPlugins();

    QPluginLoader* pluginLoader = mPlugins[index];

    QObject *plugin = pluginLoader->instance();

    if (plugin)

    {

        return qobject_cast<CntUiExtensionFactory*>(plugin);

    }

    return NULL;

}

CntUiExtensionFactory* CntExtensionManager::servicePlugin(int serviceId)

{

    foreach(QPluginLoader* pluginLoader, mPlugins )

    {

        QObject *plugin = pluginLoader->instance();

        if (plugin)

        {

            CntUiExtensionFactory* interfacePlugin = qobject_cast<CntUiExtensionFactory*>(plugin);

            if(interfacePlugin && interfacePlugin->hasService(serviceId))

            {

                return interfacePlugin;

            }

        }

    }

    return NULL;

}

void CntExtensionManager::loadExtensionPlugins()

{

    if(mPluginsLoaded)

    {

        // Plugins already loaded, just return.

        return;

    }

    // TBD: extension should be loaded when they are first time needed.

    // This is needed due to performance impact on contacts startup.

    // Also framework should provide means to load new plugins

    // in runtime. It is very likely use case that new plugins will be

    // installed in runtime while contacts is running => new plugin should

    // be loaded when it is added to file system (assuming that this

    // extension API will be open for 3rd party plugins)

    QDir pluginsDir(CNT_UI_EXTENSION_PLUGIN_DIRECTORY);

    foreach (QString fileName, pluginsDir.entryList(QDir::Files))

    {

        // Create plugin loader

        QPluginLoader* pluginLoader = new QPluginLoader( 

                pluginsDir.absoluteFilePath(fileName));

        if ( pluginLoader->load() )

        {

            QObject *plugin = pluginLoader->instance();

            if (plugin)

            {

                CntUiExtensionFactory* interface = qobject_cast<CntUiExtensionFactory*>(plugin); 

                if ( interface )

                {

                    mPlugins.append(pluginLoader);

                }

                // If plugin loader did not load our plugin, unload the loader

                else

                {

                    pluginLoader->unload();

                }

            }

        }

    }

    mPluginsLoaded = true;

}

void CntExtensionManager::unloadExtensionPlugins()

{

    // Unload plugins and clear plugin array

    foreach (QPluginLoader* pluginLoader, mPlugins)

    {

        pluginLoader->unload();

    }   

    mPlugins.clear();  

    mPluginsLoaded = false;  

}