/***************************************************************************
 *   Copyright (C) 2007 by Lothar May                                      *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
/* A manager for avatar files, MD5sums and a cache. */

#ifndef _AVATARMANAGER_H_
#define _AVATARMANAGER_H_

#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>

#include <map>
#include <list>

#include <net/netpacket.h>

#define MIN_AVATAR_FILE_SIZE	32
#define MAX_AVATAR_FILE_SIZE	30720

struct AvatarFileState;
class UploaderThread;

class AvatarManager
{
public:

	AvatarManager(bool useExternalServer = false, const std::string &externalServerAddress = "",
			const std::string &externalServerUser = "", const std::string &externalServerPassword = "");
	~AvatarManager();

	bool Init(const std::string &dataDir, const std::string &cacheDir);

	void AddSingleAvatar(const std::string &fileName);

	static boost::shared_ptr<AvatarFileState> OpenAvatarFileForChunkRead(const std::string &fileName, unsigned &outFileSize, AvatarFileType &outFileType);
	static unsigned ChunkReadAvatarFile(boost::shared_ptr<AvatarFileState> fileState, unsigned char *data, unsigned chunkSize);

	static int AvatarFileToNetPackets(const std::string &fileName, unsigned requestId, NetPacketList &packets);
	static AvatarFileType GetAvatarFileType(const std::string &fileName);
	static std::string GetAvatarFileExtension(AvatarFileType fileType);

	bool GetHashForAvatar(const std::string &fileName, MD5Buf &md5buf) const;
	bool GetAvatarFileName(const MD5Buf &md5buf, std::string &fileName) const;
	bool HasAvatar(const MD5Buf &md5buf) const;
	bool StoreAvatarInCache(const MD5Buf &md5buf, AvatarFileType avatarFileType, const unsigned char *data, unsigned size, bool upload);

	static bool IsValidAvatarFileType(AvatarFileType avatarFileType, const unsigned char *fileHeader, unsigned fileHeaderSize);

	void RemoveOldAvatarCacheEntries();

protected:
	typedef std::map<MD5Buf, std::string> AvatarMap;
	typedef std::list<MD5Buf> AvatarList;
	typedef std::map<std::time_t, MD5Buf> TimeAvatarMap;

	bool InternalReadDirectory(const std::string &dir, AvatarMap &avatars);

private:
	mutable boost::mutex	m_avatarsMutex;
	AvatarMap				m_avatars;

	mutable boost::mutex	m_cachedAvatarsMutex;
	AvatarMap				m_cachedAvatars;

	mutable boost::mutex	m_cacheDirMutex;
	std::string				m_cacheDir;

	const bool				m_useExternalServer;
	const std::string		m_externalServerAddress;
	const std::string		m_externalServerUser;
	const std::string		m_externalServerPassword;

	boost::shared_ptr<UploaderThread> m_uploader;
};

#endif