/*

* 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:  

*

*/

#include <btdevsettingpluginloader.h>

#include <QString>

#include <QDir>

#include <QFileInfo>

#include <QPluginLoader>

#include <btdevsettinginterface.h>

#include <btdevsettingglobal.h>

/*!

    \class BtDevSettingPluginLoader

    \brief The BtDevSettingPluginLoader class loads BT device setting plugins.

 */

#ifdef WIN32

    #define PLUGINFILE_SUFFIX "dll"

#else

    #define PLUGINFILE_SUFFIX "qtplugin"

#endif

static QStringList getDrives()

{

    static QStringList drives;

    if (drives.empty()) {

#ifdef WIN32

        drives.append("C:");

#else

        QFileInfoList fileInfoList = QDir::drives();

        foreach(const QFileInfo &fileInfo,fileInfoList) {

            QString str = fileInfo.filePath();

            if (str.length() > 2) {

                str = str.left(2);

            }

            drives.append(str);

        }

#endif

    }

    return drives;

}

static QStringList directoriesFromAllDrives(const QString &baseDir)

{

    QStringList dirs;

    QStringList drives = getDrives();

    foreach(const QString &drive,drives) {

        QString dir = drive + baseDir + QDir::separator();

        if (QFileInfo(dir).exists()) {

            dirs.append(dir);

        }

    }

    return dirs;

}

static BtDevSettingInterface* loadPluginInterface(const QFileInfo &pluginFile)

{    

    QPluginLoader loader(pluginFile.absoluteFilePath());

    BtDevSettingInterface *plugin = 

            qobject_cast<BtDevSettingInterface*> (loader.instance());

    if (!plugin) {

        loader.unload();

    }

    return plugin;

}

/*!

   Load all setting interfaces.

   \return the list of plugin interface.

 */

QList<BtDevSettingInterface*> BtDevSettingPluginLoader::loadDevSettingInterfaces()

{

    QList<BtDevSettingInterface*> interfaces;

    static QStringList pluginDirs;

    if (pluginDirs.empty()) {

        pluginDirs = directoriesFromAllDrives(BTDEVSETTING_PLUGIN_PATH);

    }

    foreach(const QString &dirStr,pluginDirs) {

        QDir pluginDir( dirStr );

        QFileInfoList fileInfoList = pluginDir.entryInfoList( QDir::Files );

        foreach(const QFileInfo &fileInfo,fileInfoList) {

            int diff = fileInfo.suffix().compare(PLUGINFILE_SUFFIX,Qt::CaseInsensitive);

            if (!diff) {

                BtDevSettingInterface* settingIf = loadPluginInterface(fileInfo);

                if ( settingIf ) {

                    interfaces.append( settingIf );

                }

            }

        }

    }

    return interfaces;

}