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+/**
+ * @file llconversationlog.h
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LLCONVERSATIONLOG_H_
+#define LLCONVERSATIONLOG_H_
+
+#include "llcallingcard.h"
+#include "llfloaterimsession.h"
+#include "llimview.h"
+
+class LLConversationLogObserver;
+struct ConversationParams;
+
+typedef LLIMModel::LLIMSession::SType SessionType;
+
+/*
+ * This class represents a particular session(conversation) of any type(im/voice/p2p/group/...) by storing some of session's data.
+ * Each LLConversation object has a corresponding visual representation in a form of LLConversationLogListItem.
+ */
+class LLConversation
+{
+public:
+
+	LLConversation(const ConversationParams& params);
+	LLConversation(const LLIMModel::LLIMSession& session);
+	LLConversation(const LLConversation& conversation);
+
+	~LLConversation();
+
+	const SessionType&	getConversationType()	const	{ return mConversationType; }
+	const std::string&	getConversationName()	const	{ return mConversationName; }
+	const std::string&	getHistoryFileName()	const	{ return mHistoryFileName; }
+	const LLUUID&		getSessionID()			const	{ return mSessionID; }
+	const LLUUID&		getParticipantID()		const	{ return mParticipantID; }
+	const std::string&	getTimestamp()			const	{ return mTimestamp; }
+	const time_t&		getTime()				const	{ return mTime; }
+	bool				hasOfflineMessages()	const	{ return mHasOfflineIMs; }
+
+	void setConversationName(std::string conv_name) { mConversationName = conv_name; }
+	void setOfflineMessages(bool new_messages) { mHasOfflineIMs = new_messages; }
+	bool isOlderThan(U32 days) const;
+
+	/*
+	 * updates last interaction time
+	 */
+	void updateTimestamp();
+
+	/*
+	 * Resets flag of unread offline message to false when im floater with this conversation is opened.
+	 */
+	void onIMFloaterShown(const LLUUID& session_id);
+
+	/*
+	 * returns string representation(in form of: mm/dd/yyyy hh:mm) of time when conversation was started
+	 */
+	static const std::string createTimestamp(const time_t& utc_time);
+
+private:
+
+	/*
+	 * If conversation has unread offline messages sets callback for opening LLFloaterIMSession
+	 * with this conversation.
+	 */
+	void setListenIMFloaterOpened();
+
+	boost::signals2::connection mIMFloaterShowedConnection;
+
+	time_t			mTime; // last interaction time
+	SessionType		mConversationType;
+	std::string		mConversationName;
+	std::string		mHistoryFileName;
+	LLUUID			mSessionID;
+	LLUUID			mParticipantID;
+	bool			mHasOfflineIMs;
+	std::string		mTimestamp; // last interaction time in form of: mm/dd/yyyy hh:mm
+};
+
+/**
+ * LLConversationLog stores all agent's conversations.
+ * This class is responsible for creating and storing LLConversation objects when im or voice session starts.
+ * Also this class saves/retrieves conversations to/from file.
+ *
+ * Also please note that it may be several conversations with the same sessionID stored in the conversation log.
+ * To distinguish two conversations with the same sessionID it's also needed to compare their creation date.
+ */
+
+class LLConversationLog : public LLSingleton<LLConversationLog>, LLIMSessionObserver
+{
+	friend class LLSingleton<LLConversationLog>;
+public:
+
+	void removeConversation(const LLConversation& conversation);
+
+	/**
+	 * Returns first conversation with matched session_id
+	 */
+	const LLConversation*				getConversation(const LLUUID& session_id);
+	const std::vector<LLConversation>&	getConversations() { return mConversations; }
+
+	void addObserver(LLConversationLogObserver* observer);
+	void removeObserver(LLConversationLogObserver* observer);
+
+	// LLIMSessionObserver triggers
+	virtual void sessionAdded(const LLUUID& session_id, const std::string& name, const LLUUID& other_participant_id, BOOL has_offline_msg);
+    virtual void sessionActivated(const LLUUID& session_id, const std::string& name, const LLUUID& other_participant_id) {}; // Stub
+	virtual void sessionRemoved(const LLUUID& session_id){}											// Stub
+	virtual void sessionVoiceOrIMStarted(const LLUUID& session_id){};								// Stub
+	virtual void sessionIDUpdated(const LLUUID& old_session_id, const LLUUID& new_session_id){};	// Stub
+
+	void notifyObservers();
+
+	void onNewMessageReceived(const LLSD& data);
+
+	/**
+	 * public method which is called on viewer exit to save conversation log
+	 */
+	void cache();
+
+	void onClearLog();
+	void onClearLogResponse(const LLSD& notification, const LLSD& response);
+
+	bool getIsLoggingEnabled() { return mLoggingEnabled; }
+	bool isLogEmpty() { return mConversations.empty(); }
+
+private:
+
+	LLConversationLog();
+	virtual ~LLConversationLog()
+	{
+		if (mAvatarNameCacheConnection.connected())
+		{
+			mAvatarNameCacheConnection.disconnect();
+		}
+	}
+	
+	void enableLogging(S32 log_mode);
+
+	/**
+	 * adds conversation to the conversation list and notifies observers
+	 */
+	void logConversation(const LLUUID& session_id, BOOL has_offline_msg);
+
+	void notifyParticularConversationObservers(const LLUUID& session_id, U32 mask);
+
+	/**
+	 * constructs file name in which conversations log will be saved
+	 * file name is conversation.log
+	 */
+	std::string getFileName();
+
+	bool saveToFile(const std::string& filename);
+	bool loadFromFile(const std::string& filename);
+
+	void onAvatarNameCache(const LLUUID& participant_id, const LLAvatarName& av_name, const LLIMModel::LLIMSession* session);
+
+	void createConversation(const LLIMModel::LLIMSession* session);
+	void updateConversationTimestamp(LLConversation* conversation);
+	void updateConversationName(const LLIMModel::LLIMSession* session, const std::string& name);
+	void updateOfflineIMs(const LLIMModel::LLIMSession* session, BOOL new_messages);
+
+	LLConversation* findConversation(const LLIMModel::LLIMSession* session);
+
+	typedef std::vector<LLConversation> conversations_vec_t;
+	std::vector<LLConversation>				mConversations;
+	std::set<LLConversationLogObserver*>	mObservers;
+
+	LLFriendObserver* mFriendObserver;		// Observer of the LLAvatarTracker instance
+
+	boost::signals2::connection mNewMessageSignalConnection;
+	boost::signals2::connection mAvatarNameCacheConnection;
+
+	bool mLoggingEnabled;
+};
+
+class LLConversationLogObserver
+{
+public:
+
+	enum EConversationChange
+		{
+			CHANGED_TIME = 1, // last interaction time changed
+			CHANGED_NAME = 2,  // conversation name changed
+			CHANGED_OfflineIMs = 3
+		};
+
+	virtual ~LLConversationLogObserver(){}
+	virtual void changed() = 0;
+	virtual void changed(const LLUUID& session_id, U32 mask){};
+};
+
+#endif /* LLCONVERSATIONLOG_H_ */