/*****************************************************************************
 * PokerTH - The open source texas holdem engine                             *
 * Copyright (C) 2006-2011 Felix Hammer, Florian Thauer, Lothar May          *
 *                                                                           *
 * This program is free software: you can redistribute it and/or modify      *
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.                       *
 *                                                                           *
 * You should have received a copy of the GNU Affero General Public License  *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.     *
 *****************************************************************************/
/* Buffer for sending network data. */

#ifndef _SENDBUFFER_H_
#define _SENDBUFFER_H_

#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <cstdlib>


#define SEND_BUF_FIRST_ALLOC_CHUNKSIZE		4096
#define MAX_SEND_BUF_SIZE					SEND_BUF_FIRST_ALLOC_CHUNKSIZE * 256


class SendBuffer : public boost::enable_shared_from_this<SendBuffer>
{
public:
	SendBuffer();
	~SendBuffer();

	inline size_t GetSendBufLeft() const {
		int bytesLeft = (int)(sendBufAllocated - sendBufUsed);
		return bytesLeft < 0 ? (size_t)0 : (size_t)bytesLeft;
	}

	inline size_t GetAllocated() const {
		return sendBufAllocated;
	}

	inline bool ReallocSendBuf() {
		bool retVal = false;
		size_t allocAmount = sendBufAllocated * 2;
		if (0 == allocAmount) {
			allocAmount = (size_t)SEND_BUF_FIRST_ALLOC_CHUNKSIZE;
		}
		if (allocAmount <= MAX_SEND_BUF_SIZE) {
			char *tempBuf = (char *)std::realloc(sendBuf, allocAmount);
			if (tempBuf) {
				sendBuf = tempBuf;
				sendBufAllocated = allocAmount;
				retVal = true;
			}
		}
		return retVal;
	}

	inline void AppendToSendBufWithoutCheck(const char *data, size_t size) {
		std::memcpy(sendBuf + sendBufUsed, data, size);
		sendBufUsed += size;
	}

	void HandleWrite(boost::shared_ptr<boost::asio::ip::tcp::socket> socket, const boost::system::error_code &error);
	void AsyncSendNextPacket(boost::shared_ptr<boost::asio::ip::tcp::socket> socket);

	static int EncodeToBuf(const void *data, size_t size, void *arg);

	mutable boost::mutex dataMutex;

private:
	char *sendBuf;
	char *curWriteBuf;
	size_t sendBufAllocated;
	size_t sendBufUsed;
	size_t curWriteBufAllocated;
	size_t curWriteBufUsed;
};

#endif