/***************************************************************************
 *   Copyright (C) 2005 by Joris Guisson                                   *
 *   joris.guisson@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 NETSOCKETGROUP_H
#define NETSOCKETGROUP_H
		
#include <list>
#include <util/constants.h>

namespace net
{
	using bt::Uint32;
	
	class BufferedSocket;

	/**
		@author Joris Guisson <joris.guisson@gmail.com>
	*/
	class SocketGroup
	{
		Uint32 limit;
		Uint32 assured_rate;
		std::list<BufferedSocket*> sockets;
		bt::TimeStamp prev_run_time;
		Uint32 group_allowance;
		Uint32 group_assured;
	public:
		SocketGroup(Uint32 limit,Uint32 assured_rate);
		virtual ~SocketGroup();
		
		/// Clear the lists of sockets
		void clear() {sockets.clear();}
		
		/// Add a socket for processing
		void add(BufferedSocket* s) {sockets.push_back(s);}

		/** 
			Process all the sockets in the vector for download.
			@param global_allowance How much the group can do, this will be updated, 0 means no limit
			@param now Current time
			@return true if we can download more data, false otherwise
		*/
		bool download(Uint32 & global_allowance,bt::TimeStamp now);
		
		/** 
			Process all the sockets in the vector for upload
			@param global_allowance How much the group can do, this will be updated, 0 means no limit
			@param now Current time
			@return true if we can upload more data, false otherwise
		 */
		bool upload(Uint32 & global_allowance,bt::TimeStamp now);
		
		/**
		 * Set the group limit in bytes per sec
		 * @param lim The limit
		 */
		void setLimit(Uint32 lim) {limit = lim;}
		
		/**
		 * Set the assured rate for the gorup in bytes per sec
		 * @param as The assured rate
		 */
		void setAssuredRate(Uint32 as) {assured_rate = as;}
		
		/// Get the number of sockets 
		Uint32 numSockets() const {return sockets.size();}
		
		/**
		 * Calculate the allowance for this group
		 * @param now Current timestamp
		 */
		void calcAllowance(bt::TimeStamp now);
		
		/**
		 * Get the assured allowance .
		 */
		Uint32 getAssuredAllowance() const {return group_assured;}
	private:
		void processUnlimited(bool up,bt::TimeStamp now);
		bool processLimited(bool up,bt::TimeStamp now,Uint32 & allowance);
		bool process(bool up,bt::TimeStamp now,Uint32 & global_allowance);
	};


}

#endif
