/*************************************************************************
 *  Copyright (C) 2010 by Volker Lanz <vl@fidra.de>                      *
 *  Copyright (C) 2015 by Teo Mrnjavac <teo@kde.org>                     *
 *                                                                       *
 *  This program is free software; you can redistribute it and/or        *
 *  modify it under the terms of the GNU General Public License as       *
 *  published by the Free Software Foundation; either version 3 of       *
 *  the License, or (at your option) any later version.                  *
 *                                                                       *
 *  This program is distributed in the hope that it will be useful,      *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 *  GNU General Public License for more details.                         *
 *                                                                       *
 *  You should have received a copy of the GNU General Public License    *
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
 *************************************************************************/

#include "backend/corebackendmanager.h"
#include "backend/corebackend.h"

#include <QDebug>
#include <QStringList>
#include <QString>

#include <KLocalizedString>
#include <KPluginLoader>
#include <KServiceTypeTrader>

#include <config.h>

CoreBackendManager::CoreBackendManager() :
	m_Backend(NULL)
{
}

CoreBackendManager* CoreBackendManager::self()
{
	static CoreBackendManager* instance = NULL;

	if (instance == NULL)
		instance = new CoreBackendManager;

	return instance;
}

KService::List CoreBackendManager::list() const
{
    return KServiceTypeTrader::self()->query(QStringLiteral("PartitionManager/Plugin"),
                                             QStringLiteral("[X-KDE-PluginInfo-Category] == 'BackendPlugin'"));
}

bool CoreBackendManager::load(const QString& name)
{
	if (backend())
		unload();

	KPluginLoader loader(name);

    KPluginFactory* factory = loader.factory();

	if (factory != NULL)
	{
        m_Backend = factory->create<CoreBackend>(NULL);

        QString id = loader.metaData().toVariantMap().value(QStringLiteral("MetaData"))
                     .toMap().value(QStringLiteral("KPlugin")).toMap().value(QStringLiteral("Id")).toString();
	QString version = loader.metaData().toVariantMap().value(QStringLiteral("MetaData"))
                     .toMap().value(QStringLiteral("KPlugin")).toMap().value(QStringLiteral("Version")).toString();
        if ( id.isEmpty() )
            return false;

        backend()->setId( id );
	backend()->setVersion ( version );
        qDebug() << "Loaded backend plugin: " << backend()->id();
		return true;
	}

	qWarning() << "Could not load plugin for core backend " << name << ": " << loader.errorString();
	return false;
}

void CoreBackendManager::unload()
{
	delete m_Backend;
	m_Backend = NULL;
}