/***************************************************************************
 *   Copyright (C) 2008 by Joris Guisson and Ivan Vasic                    *
 *   joris.guisson@gmail.com                                               *
 *   ivasic@gmail.com                                                      *
 *                                                                         *
 *   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 2 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, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/
#ifndef KTDOWNLOADORDERMANAGER_H
#define KTDOWNLOADORDERMANAGER_H

#include <QList>
#include <QObject>
#include <util/constants.h>

namespace bt
{
	class TorrentInterface;
}

namespace kt
{

	/**
		Class which manages the file download order for a single torrent
	*/
	class DownloadOrderManager : public QObject
	{
		Q_OBJECT
	public:
		DownloadOrderManager(bt::TorrentInterface* tor);
		virtual ~DownloadOrderManager();
		
		/// See if the file download order is enabled
		bool enabled() const {return order.count() > 0;}
		
		/// Save the order from torX/download_order
		void save();
		
		/// Load the order to torX/download_order
		void load();
		
		/// Enable the download order
		void enable();
		
		/// Disable the download order
		void disable();
		
		typedef QList<bt::Uint32> Order;
		
		/// Get the download order
		const Order & downloadOrder() const {return order;}
		
		/// Set the order
		void setDownloadOrder(const Order & norder) {order = norder;}
		
	public slots:
		/**
		 * Change file priorities if needed
		 */
		void update();
		
		/**
		 * Change file priorities if needed
		 */
		void chunkDownloaded(bt::TorrentInterface* me,bt::Uint32 chunk);
		
	private:
		bt::Uint32 nextIncompleteFile();

	private:
		bt::TorrentInterface* tor;
		QList<bt::Uint32> order;
		bt::Uint32 current_high_priority_file;
	};

}

#endif
