/*

 * Copyright (c) 2010 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: Implementation of the Positioning Settings Plugins Loader class 

 *

 */

#include "possettingspluginsloader.h"

#include "possettingscrkey.h"

#include <QDir>

#include <QFileInfoList>

#include <QFileInfo>

#include <QPluginLoader>

#include <QDebug>

#include <xqsettingsmanager.h>

#include <xqsettingskey.h>

#ifdef Q_OS_SYMBIAN

#define PLUGIN_PATH QString("\\resource\\qt\\plugins\\positioningsettings")

#else

#define PLUGIN_PATH QString("C:\\qt\\plugins\\positioningsettings")

#endif 

// constants

const int KNoOfDigits = 4;

//---------------------------------------------------------------------

// PosSettingsPluginsLoader::PosSettingsPluginsLoader

// 

//---------------------------------------------------------------------

PosSettingsPluginsLoader::PosSettingsPluginsLoader()

    {

    qDebug() << "+ PosSettingsPluginsLoader::PosSettingsPluginsLoader()";

    qDebug() << "- PosSettingsPluginsLoader::PosSettingsPluginsLoader()";

    }

//---------------------------------------------------------------------

// PosSettingsPluginsLoader::~PosSettingsPluginsLoader

// 

//---------------------------------------------------------------------

PosSettingsPluginsLoader::~PosSettingsPluginsLoader()

    {

    qDebug() << "+ PosSettingsPluginsLoader::~PosSettingsPluginsLoader()";

    mDllNameList.clear();

    qDebug() << "- PosSettingsPluginsLoader::~PosSettingsPluginsLoader()";

    }

//---------------------------------------------------------------------

// PosSettingsPluginsLoader::loadPlugins

// 

//---------------------------------------------------------------------

QList<PosSettingsAdvInterface*> PosSettingsPluginsLoader::loadPlugins()

    {

    qDebug() << "+ PosSettingsPluginsLoader::loadPlugins()";

    // parse the default cen rep key value which is used to determine

    // the order of loading the default positioning settings plugins

    ParseCenRepKey();

    // List containing the plugins implementing the PositioningSettingsAdvancedInterface

    QList<PosSettingsAdvInterface*> pluginsList;

    // Check for the files under the positioningsettings directory

    QDir pluginsDir(PLUGIN_PATH + QDir::separator());

    QFileInfoList fileInfoList = pluginsDir.entryInfoList();

    // check each file in this directory,only if its a dll give it to the

    // plugin loader

    foreach ( const QFileInfo &fileInfo, fileInfoList )

            {

            QString fileName = fileInfo.absoluteFilePath();

						qDebug() << "Filename: " <<  fileName;

            if (!QLibrary::isLibrary(fileName))

                {

                continue;

                }

            // load the dlls using QPluginLoader

            QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));

            qDebug() << "Plugin Filename: " <<  pluginsDir.absoluteFilePath(fileName);

            QObject *plugin = pluginLoader.instance();

            // Check if the plugin found is an implementation of the

            // PosSettingsAdvInterface,if yes add it to the plugins list

            if (plugin)

                {

                PosSettingsAdvInterface* advancedInterface = qobject_cast<

                        PosSettingsAdvInterface *> (plugin);

                if (advancedInterface)

                    {

                    QString dllName = fileInfo.baseName();

                    // check the position into which the plugin needs to be

                    // inserted if it is one of the default plugins

                    for (int i = 0; i < mDllNameList.count(); i++)

                        {

                        if (dllName.compare(mDllNameList[i],Qt::CaseInsensitive) == KErrNone)

                            {

                            pluginsList.insert(i, advancedInterface);

                            break;

                            }

                        }

                    }

                }

            }

    qDebug() << "- PosSettingsPluginsLoader::loadPlugins()";

    return pluginsList;

    }

//---------------------------------------------------------------------

// PosSettingsPluginsLoader::ParseCenRepKey

// 

//---------------------------------------------------------------------

void PosSettingsPluginsLoader::ParseCenRepKey()

    {

    qDebug() << "+ PosSettingsPluginsLoader::ParseCenRepKey()";

    // create a XQSettingsManager instance

    XQSettingsManager* manager = new XQSettingsManager();

    // create a XQSettingsKey object to read the cenrep key value

    XQSettingsKey cenrepKey(XQSettingsKey::TargetCentralRepository,

            KCRUidPositioningSettings.iUid, KPositioningSettingsPlugins);

    // read the cenrep key value

    QVariant key(manager->readItemValue(cenrepKey,XQSettingsManager::TypeString));

    // convert the key value to string

    QString keyStringValue = key.toString();

    // if the length of default value is less than 4 digits then return

    if (keyStringValue.size() < KNoOfDigits)

        {

        qDebug() << "- PosSettingsPluginsLoader::ParseCenRepKey()";

        return;

        }

    // get the count of the number of plugin dlls

    int dllCount = keyStringValue.left(KNoOfDigits).toInt();

    // initialise current index to 4

    int currentIndex = KNoOfDigits;

    // extract the name of each of the dll from the cenrep key value

    for (int i = 0; i < dllCount; i++)

        {

        // extract length of dll name

        int length = keyStringValue.mid(currentIndex, KNoOfDigits).toInt();

        // increment the current index value

        currentIndex += KNoOfDigits;

        // get the dll name

        QString dllName = keyStringValue.mid(currentIndex, length);

        // append to list of dll names

        mDllNameList.append(dllName);

        // increment the value of currentIndex by length of name

        currentIndex += length;

        }

    qDebug() << "- PosSettingsPluginsLoader::ParseCenRepKey()";

    }