/** 
 * @file llvoiceclient.h
 * @brief Declaration of LLVoiceClient class which is the interface to the voice client process.
 *
 * $LicenseInfo:firstyear=2001&license=viewergpl$
 * 
 * Copyright (c) 2001-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
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 */
#ifndef LL_VOICE_CLIENT_H
#define LL_VOICE_CLIENT_H

class LLVOAvatar;
class LLVivoxProtocolParser;

#include "lliopipe.h"
#include "llpumpio.h"
#include "llchainio.h"
#include "lliosocket.h"
#include "v3math.h"
#include "llframetimer.h"
#include "llviewerregion.h"
#include "m3math.h"			// LLMatrix3

class LLFriendObserver;
class LLVoiceClientParticipantObserver
{
public:
	virtual ~LLVoiceClientParticipantObserver() { }
	virtual void onChange() = 0;
};

class LLVoiceClientStatusObserver
{
public:
	typedef enum e_voice_status_type
	{
		// NOTE: when updating this enum, please also update the switch in
		//  LLVoiceClientStatusObserver::status2string().
		STATUS_LOGIN_RETRY,
		STATUS_LOGGED_IN,
		STATUS_JOINING,
		STATUS_JOINED,
		STATUS_LEFT_CHANNEL,
		STATUS_VOICE_DISABLED,

		// Adding STATUS_VOICE_ENABLED as pair status for STATUS_VOICE_DISABLED
		// See LLVoiceClient::setVoiceEnabled()
		STATUS_VOICE_ENABLED,

		BEGIN_ERROR_STATUS,
		ERROR_CHANNEL_FULL,
		ERROR_CHANNEL_LOCKED,
		ERROR_NOT_AVAILABLE,
		ERROR_UNKNOWN
	} EStatusType;

	virtual ~LLVoiceClientStatusObserver() { }
	virtual void onChange(EStatusType status, const std::string &channelURI, bool proximal) = 0;

	static std::string status2string(EStatusType inStatus);
};

class LLVoiceClient: public LLSingleton<LLVoiceClient>
{
	LOG_CLASS(LLVoiceClient);
	public:
		LLVoiceClient();	
		~LLVoiceClient();
		
	public:
		static void init(LLPumpIO *pump);	// Call this once at application startup (creates connector)
		static void terminate();	// Call this to clean up during shutdown
						
	protected:
		bool writeString(const std::string &str);

	public:
		
		static F32 OVERDRIVEN_POWER_LEVEL;

		void updateSettings(); // call after loading settings and whenever they change
	
		void getCaptureDevicesSendMessage();
		void getRenderDevicesSendMessage();
		
		void clearCaptureDevices();
		void addCaptureDevice(const std::string& name);
		void setCaptureDevice(const std::string& name);
		
		void clearRenderDevices();
		void addRenderDevice(const std::string& name);
		void setRenderDevice(const std::string& name);

		void tuningStart();
		void tuningStop();
		bool inTuningMode();
		bool inTuningStates();
		
		void tuningRenderStartSendMessage(const std::string& name, bool loop);
		void tuningRenderStopSendMessage();

		void tuningCaptureStartSendMessage(int duration);
		void tuningCaptureStopSendMessage();
		
		void tuningSetMicVolume(float volume=0.5f);
		void tuningSetSpeakerVolume(float volume);
		float tuningGetEnergy(void);
				
		// This returns true when it's safe to bring up the "device settings" dialog in the prefs.
		// i.e. when the daemon is running and connected, and the device lists are populated.
		bool deviceSettingsAvailable();
		
		// Requery the vivox daemon for the current list of input/output devices.
		// If you pass true for clearCurrentList, deviceSettingsAvailable() will be false until the query has completed
		// (use this if you want to know when it's done).
		// If you pass false, you'll have no way to know when the query finishes, but the device lists will not appear empty in the interim.
		void refreshDeviceLists(bool clearCurrentList = true);
		
		// Call this if the connection to the daemon terminates unexpectedly.  It will attempt to reset everything and relaunch.
		void daemonDied();

		// Call this if we're just giving up on voice (can't provision an account, etc.).  It will clean up and go away.
		void giveUp();
		
		/////////////////////////////
		// Response/Event handlers
		void connectorCreateResponse(int statusCode, std::string &statusString, std::string &connectorHandle, std::string &versionID);
		void loginResponse(int statusCode, std::string &statusString, std::string &accountHandle, int numberOfAliases);
		void sessionCreateResponse(std::string &requestId, int statusCode, std::string &statusString, std::string &sessionHandle);
		void sessionGroupAddSessionResponse(std::string &requestId, int statusCode, std::string &statusString, std::string &sessionHandle);
		void sessionConnectResponse(std::string &requestId, int statusCode, std::string &statusString);
		void logoutResponse(int statusCode, std::string &statusString);
		void connectorShutdownResponse(int statusCode, std::string &statusString);

		void accountLoginStateChangeEvent(std::string &accountHandle, int statusCode, std::string &statusString, int state);
		void mediaStreamUpdatedEvent(std::string &sessionHandle, std::string &sessionGroupHandle, int statusCode, std::string &statusString, int state, bool incoming);
		void textStreamUpdatedEvent(std::string &sessionHandle, std::string &sessionGroupHandle, bool enabled, int state, bool incoming);
		void sessionAddedEvent(std::string &uriString, std::string &alias, std::string &sessionHandle, std::string &sessionGroupHandle, bool isChannel, bool incoming, std::string &nameString, std::string &applicationString);
		void sessionGroupAddedEvent(std::string &sessionGroupHandle);
		void sessionRemovedEvent(std::string &sessionHandle, std::string &sessionGroupHandle);
		void participantAddedEvent(std::string &sessionHandle, std::string &sessionGroupHandle, std::string &uriString, std::string &alias, std::string &nameString, std::string &displayNameString, int participantType);
		void participantRemovedEvent(std::string &sessionHandle, std::string &sessionGroupHandle, std::string &uriString, std::string &alias, std::string &nameString);
		void participantUpdatedEvent(std::string &sessionHandle, std::string &sessionGroupHandle, std::string &uriString, std::string &alias, bool isModeratorMuted, bool isSpeaking, int volume, F32 energy);
		void auxAudioPropertiesEvent(F32 energy);
		void buddyPresenceEvent(std::string &uriString, std::string &alias, std::string &statusString, std::string &applicationString);
		void messageEvent(std::string &sessionHandle, std::string &uriString, std::string &alias, std::string &messageHeader, std::string &messageBody, std::string &applicationString);
		void sessionNotificationEvent(std::string &sessionHandle, std::string &uriString, std::string &notificationType);
		void subscriptionEvent(std::string &buddyURI, std::string &subscriptionHandle, std::string &alias, std::string &displayName, std::string &applicationString, std::string &subscriptionType);
		
		void buddyListChanged();
		void muteListChanged();
		void updateFriends(U32 mask);
		
		/////////////////////////////
		// Sending updates of current state
static	void updatePosition(void);
		void setCameraPosition(const LLVector3d &position, const LLVector3 &velocity, const LLMatrix3 &rot);
		void setAvatarPosition(const LLVector3d &position, const LLVector3 &velocity, const LLMatrix3 &rot);
		bool channelFromRegion(LLViewerRegion *region, std::string &name);
		void leaveChannel(void);		// call this on logout or teleport begin

		
		void setMuteMic(bool muted);		// Use this to mute the local mic (for when the client is minimized, etc), ignoring user PTT state.
		bool getMuteMic() const;
		void setUserPTTState(bool ptt);
		bool getUserPTTState();
		void toggleUserPTTState(void);
		void inputUserControlState(bool down); // interpret any sort of up-down mic-open control input according to ptt-toggle prefs
		void setVoiceEnabled(bool enabled);
		static bool voiceEnabled();
		void setUsePTT(bool usePTT);
		void setPTTIsToggle(bool PTTIsToggle);
		void setPTTKey(std::string &key);
		void setEarLocation(S32 loc);
		void setVoiceVolume(F32 volume);
		void setMicGain(F32 volume);
		void setUserVolume(const LLUUID& id, F32 volume); // sets volume for specified agent, from 0-1 (where .5 is nominal)
		void setLipSyncEnabled(BOOL enabled);
		BOOL lipSyncEnabled();

		// PTT key triggering
		void keyDown(KEY key, MASK mask);
		void keyUp(KEY key, MASK mask);
		void middleMouseState(bool down);

		// Return the version of the Vivox library
		std::string getAPIVersion() const { return mAPIVersion; }
		
		/////////////////////////////
		// Accessors for data related to nearby speakers
		BOOL getVoiceEnabled(const LLUUID& id);		// true if we've received data for this avatar
		BOOL getIsSpeaking(const LLUUID& id);
		BOOL getIsModeratorMuted(const LLUUID& id);
		F32 getCurrentPower(const LLUUID& id);		// "power" is related to "amplitude" in a defined way.  I'm just not sure what the formula is...
		BOOL getOnMuteList(const LLUUID& id);
		F32 getUserVolume(const LLUUID& id);
		std::string getDisplayName(const LLUUID& id);
		
		// MBW -- XXX -- Not sure how to get this data out of the TVC
		BOOL getUsingPTT(const LLUUID& id);
		std::string getGroupID(const LLUUID& id);		// group ID if the user is in group chat (empty string if not applicable)

		/////////////////////////////
		BOOL getAreaVoiceDisabled();		// returns true if the area the avatar is in is speech-disabled.
											// Use this to determine whether to show a "no speech" icon in the menu bar.
		
		/////////////////////////////
		// Recording controls
		void recordingLoopStart(int seconds = 3600, int deltaFramesPerControlFrame = 200);
		void recordingLoopSave(const std::string& filename);
		void recordingStop();
		
		// Playback controls
		void filePlaybackStart(const std::string& filename);
		void filePlaybackStop();
		void filePlaybackSetPaused(bool paused);
		void filePlaybackSetMode(bool vox = false, float speed = 1.0f);
		
		
		// This is used by the string-keyed maps below, to avoid storing the string twice.
		// The 'const std::string *' in the key points to a string actually stored in the object referenced by the map.
		// The add and delete operations for each map allocate and delete in the right order to avoid dangling references.
		// The default compare operation would just compare pointers, which is incorrect, so they must use this comparitor instead.
		struct stringMapComparitor
		{
			bool operator()(const std::string* a, const std::string * b) const
			{
				return a->compare(*b) < 0;
			}
		};

		struct uuidMapComparitor
		{
			bool operator()(const LLUUID* a, const LLUUID * b) const
			{
				return *a < *b;
			}
		};
		
		struct participantState
		{
		public:
			participantState(const std::string &uri);

			bool updateMuteState();
			bool isAvatar();

			std::string mURI;
			LLUUID mAvatarID;
			std::string mAccountName;
			std::string mDisplayName;
			LLFrameTimer mSpeakingTimeout;
			F32	mLastSpokeTimestamp;
			F32 mPower;
			int mVolume;
			std::string mGroupID;
			int mUserVolume;
			bool mPTT;
			bool mIsSpeaking;
			bool mIsModeratorMuted;
			bool mOnMuteList;		// true if this avatar is on the user's mute list (and should be muted)
			bool mVolumeDirty;		// true if this participant needs a volume command sent (either mOnMuteList or mUserVolume has changed)
			bool mAvatarIDValid;
			bool mIsSelf;
		};
		typedef std::map<const std::string *, participantState*, stringMapComparitor> participantMap;

		typedef std::map<const LLUUID *, participantState*, uuidMapComparitor> participantUUIDMap;
	
		enum streamState
		{
			streamStateUnknown = 0,
			streamStateIdle = 1,
			streamStateConnected = 2,
			streamStateRinging = 3,
		};
		
		struct sessionState
		{
		public:
			sessionState();
			~sessionState();

			participantState *addParticipant(const std::string &uri);
			// Note: after removeParticipant returns, the participant* that was passed to it will have been deleted.
			// Take care not to use the pointer again after that.
			void removeParticipant(participantState *participant);
			void removeAllParticipants();

			participantState *findParticipant(const std::string &uri);
			participantState *findParticipantByID(const LLUUID& id);

			bool isCallBackPossible();
			bool isTextIMPossible();

			std::string mHandle;
			std::string mGroupHandle;
			std::string mSIPURI;
			std::string mAlias;
			std::string mName;
			std::string mAlternateSIPURI;
			std::string mHash;			// Channel password
			std::string mErrorStatusString;
			std::queue<std::string> mTextMsgQueue;
			
			LLUUID		mIMSessionID;
			LLUUID		mCallerID;
			int			mErrorStatusCode;
			int			mMediaStreamState;
			int			mTextStreamState;
			bool		mCreateInProgress;	// True if a Session.Create has been sent for this session and no response has been received yet.
			bool		mMediaConnectInProgress;	// True if a Session.MediaConnect has been sent for this session and no response has been received yet.
			bool		mVoiceInvitePending;	// True if a voice invite is pending for this session (usually waiting on a name lookup)
			bool		mTextInvitePending;		// True if a text invite is pending for this session (usually waiting on a name lookup)
			bool		mSynthesizedCallerID;	// True if the caller ID is a hash of the SIP URI -- this means we shouldn't do a name lookup.
			bool		mIsChannel;	// True for both group and spatial channels (false for p2p, PSTN)
			bool		mIsSpatial;	// True for spatial channels
			bool		mIsP2P;
			bool		mIncoming;
			bool		mVoiceEnabled;
			bool		mReconnect;	// Whether we should try to reconnect to this session if it's dropped
			// Set to true when the mute state of someone in the participant list changes.
			// The code will have to walk the list to find the changed participant(s).
			bool		mVolumeDirty;

			bool		mParticipantsChanged;
			participantMap mParticipantsByURI;
			participantUUIDMap mParticipantsByUUID;
		};

		participantState *findParticipantByID(const LLUUID& id);
		participantMap *getParticipantList(void);
		
		typedef std::map<const std::string*, sessionState*, stringMapComparitor> sessionMap;
		typedef std::set<sessionState*> sessionSet;
				
		typedef sessionSet::iterator sessionIterator;
		sessionIterator sessionsBegin(void);
		sessionIterator sessionsEnd(void);

		sessionState *findSession(const std::string &handle);
		sessionState *findSessionBeingCreatedByURI(const std::string &uri);
		sessionState *findSession(const LLUUID &participant_id);
		sessionState *findSessionByCreateID(const std::string &create_id);
		
		sessionState *addSession(const std::string &uri, const std::string &handle = LLStringUtil::null);
		void setSessionHandle(sessionState *session, const std::string &handle = LLStringUtil::null);
		void setSessionURI(sessionState *session, const std::string &uri);
		void deleteSession(sessionState *session);
		void deleteAllSessions(void);

		void verifySessionState(void);

		void joinedAudioSession(sessionState *session);
		void leftAudioSession(sessionState *session);

		// This is called in several places where the session _may_ need to be deleted.
		// It contains logic for whether to delete the session or keep it around.
		void reapSession(sessionState *session);
		
		// Returns true if the session seems to indicate we've moved to a region on a different voice server
		bool sessionNeedsRelog(sessionState *session);
		
		struct buddyListEntry
		{
			buddyListEntry(const std::string &uri);
			std::string mURI;
			std::string mDisplayName;
			LLUUID	mUUID;
			bool mOnlineSL;
			bool mOnlineSLim;
			bool mCanSeeMeOnline;
			bool mHasBlockListEntry;
			bool mHasAutoAcceptListEntry;
			bool mNameResolved;
			bool mInSLFriends;
			bool mInVivoxBuddies;
			bool mNeedsNameUpdate;
		};

		typedef std::map<const std::string*, buddyListEntry*, stringMapComparitor> buddyListMap;
		
		// This should be called when parsing a buddy list entry sent by SLVoice.		
		void processBuddyListEntry(const std::string &uri, const std::string &displayName);

		buddyListEntry *addBuddy(const std::string &uri);
		buddyListEntry *addBuddy(const std::string &uri, const std::string &displayName);
		buddyListEntry *findBuddy(const std::string &uri);
		buddyListEntry *findBuddy(const LLUUID &id);
		buddyListEntry *findBuddyByDisplayName(const std::string &name);
		void deleteBuddy(const std::string &uri);
		void deleteAllBuddies(void);

		void deleteAllBlockRules(void);
		void addBlockRule(const std::string &blockMask, const std::string &presenceOnly);
		void deleteAllAutoAcceptRules(void);
		void addAutoAcceptRule(const std::string &autoAcceptMask, const std::string &autoAddAsBuddy);
		void accountListBlockRulesResponse(int statusCode, const std::string &statusString);						
		void accountListAutoAcceptRulesResponse(int statusCode, const std::string &statusString);						
		
		/////////////////////////////
		// session control messages
		void connectorCreate();
		void connectorShutdown();

		void requestVoiceAccountProvision(S32 retries = 3);
		void userAuthorized(
			const std::string& firstName,
			const std::string& lastName,
			const LLUUID &agentID);
		void login(
			const std::string& account_name,
			const std::string& password,
			const std::string& voice_sip_uri_hostname,
			const std::string& voice_account_server_uri);
		void loginSendMessage();
		void logout();
		void logoutSendMessage();

		void accountListBlockRulesSendMessage();
		void accountListAutoAcceptRulesSendMessage();
		
		void sessionGroupCreateSendMessage();
		void sessionCreateSendMessage(sessionState *session, bool startAudio = true, bool startText = false);
		void sessionGroupAddSessionSendMessage(sessionState *session, bool startAudio = true, bool startText = false);
		void sessionMediaConnectSendMessage(sessionState *session);		// just joins the audio session
		void sessionTextConnectSendMessage(sessionState *session);		// just joins the text session
		void sessionTerminateSendMessage(sessionState *session);
		void sessionGroupTerminateSendMessage(sessionState *session);
		void sessionMediaDisconnectSendMessage(sessionState *session);
		void sessionTextDisconnectSendMessage(sessionState *session);

		// Pokes the state machine to leave the audio session next time around.
		void sessionTerminate();	
		
		// Pokes the state machine to shut down the connector and restart it.
		void requestRelog();
		
		// Does the actual work to get out of the audio session
		void leaveAudioSession();
		
		void addObserver(LLVoiceClientParticipantObserver* observer);
		void removeObserver(LLVoiceClientParticipantObserver* observer);

		void addObserver(LLVoiceClientStatusObserver* observer);
		void removeObserver(LLVoiceClientStatusObserver* observer);

		void addObserver(LLFriendObserver* observer);
		void removeObserver(LLFriendObserver* observer);
		
		void lookupName(const LLUUID &id);
		static void onAvatarNameLookup(const LLUUID& id, const std::string& first, const std::string& last, BOOL is_group);
		void avatarNameResolved(const LLUUID &id, const std::string &name);
		
		typedef std::vector<std::string> deviceList;

		deviceList *getCaptureDevices();
		deviceList *getRenderDevices();
		
		void setNonSpatialChannel(
			const std::string &uri,
			const std::string &credentials);
		void setSpatialChannel(
			const std::string &uri,
			const std::string &credentials);
		// start a voice session with the specified user
		void callUser(const LLUUID &uuid);
		
		// Send a text message to the specified user, initiating the session if necessary.
		bool sendTextMessage(const LLUUID& participant_id, const std::string& message);
		
		// close any existing text IM session with the specified user
		void endUserIMSession(const LLUUID &uuid);
		
		bool answerInvite(std::string &sessionHandle);
		void declineInvite(std::string &sessionHandle);
		void leaveNonSpatialChannel();

		// Returns the URI of the current channel, or an empty string if not currently in a channel.
		// NOTE that it will return an empty string if it's in the process of joining a channel.
		std::string getCurrentChannel();
		
		// returns true iff the user is currently in a proximal (local spatial) channel.
		// Note that gestures should only fire if this returns true.
		bool inProximalChannel();

		std::string sipURIFromID(const LLUUID &id);
				
		// Returns true if the indicated user is online via SIP presence according to SLVoice.
		// Note that we only get SIP presence data for other users that are in our vivox buddy list.
		bool isOnlineSIP(const LLUUID &id);

		// Returns true if the indicated participant is really an SL avatar.
		// This should be used to control the state of the "profile" button.
		// Currently this will be false only for PSTN callers into group chats, and PSTN p2p calls.
		bool isParticipantAvatar(const LLUUID &id);
		
		// Returns true if calling back the session URI after the session has closed is possible.
		// Currently this will be false only for PSTN P2P calls.		
		// NOTE: this will return true if the session can't be found. 
		bool isSessionCallBackPossible(const LLUUID &session_id);
		
		// Returns true if the session can accepte text IM's.
		// Currently this will be false only for PSTN P2P calls.
		// NOTE: this will return true if the session can't be found. 
		bool isSessionTextIMPossible(const LLUUID &session_id);

		bool isSessionIncoming(const LLUUID &session_id);
		
	private:

		// internal state for a simple state machine.  This is used to deal with the asynchronous nature of some of the messages.
		// Note: if you change this list, please make corresponding changes to LLVoiceClient::state2string().
		enum state
		{
			stateDisableCleanup,
			stateDisabled,				// Voice is turned off.
			stateStart,					// Class is initialized, socket is created
			stateDaemonLaunched,		// Daemon has been launched
			stateConnecting,			// connect() call has been issued
			stateConnected,				// connection to the daemon has been made, send some initial setup commands.
			stateIdle,					// socket is connected, ready for messaging
			stateMicTuningStart,
			stateMicTuningRunning,		
			stateMicTuningStop,
			stateConnectorStart,		// connector needs to be started
			stateConnectorStarting,		// waiting for connector handle
			stateConnectorStarted,		// connector handle received
			stateLoginRetry,			// need to retry login (failed due to changing password)
			stateLoginRetryWait,		// waiting for retry timer
			stateNeedsLogin,			// send login request
			stateLoggingIn,				// waiting for account handle
			stateLoggedIn,				// account handle received
			stateCreatingSessionGroup,	// Creating the main session group
			stateNoChannel,				// 
			stateJoiningSession,		// waiting for session handle
			stateSessionJoined,			// session handle received
			stateRunning,				// in session, steady state
			stateLeavingSession,		// waiting for terminate session response
			stateSessionTerminated,		// waiting for terminate session response

			stateLoggingOut,			// waiting for logout response
			stateLoggedOut,				// logout response received
			stateConnectorStopping,		// waiting for connector stop
			stateConnectorStopped,		// connector stop received
			
			// We go to this state if the login fails because the account needs to be provisioned.
			
			// error states.  No way to recover from these yet.
			stateConnectorFailed,
			stateConnectorFailedWaiting,
			stateLoginFailed,
			stateLoginFailedWaiting,
			stateJoinSessionFailed,
			stateJoinSessionFailedWaiting,

			stateJail					// Go here when all else has failed.  Nothing will be retried, we're done.
		};
		
		state mState;
		bool mSessionTerminateRequested;
		bool mRelogRequested;
		
		void setState(state inState);
		state getState(void)  { return mState; };
		static std::string state2string(state inState);
		
		void stateMachine();
		static void idle(void *user_data);
		
		LLHost mDaemonHost;
		LLSocket::ptr_t mSocket;
		bool mConnected;
		
		void closeSocket(void);
		
		LLPumpIO *mPump;
		friend class LLVivoxProtocolParser;
		
		std::string mAccountName;
		std::string mAccountPassword;
		std::string mAccountDisplayName;
		std::string mAccountFirstName;
		std::string mAccountLastName;
				
		bool mTuningMode;
		float mTuningEnergy;
		std::string mTuningAudioFile;
		int mTuningMicVolume;
		bool mTuningMicVolumeDirty;
		int mTuningSpeakerVolume;
		bool mTuningSpeakerVolumeDirty;
		state mTuningExitState;					// state to return to when we leave tuning mode.
		
		std::string mSpatialSessionURI;
		std::string mSpatialSessionCredentials;

		std::string mMainSessionGroupHandle; // handle of the "main" session group.
		
		std::string mChannelName;			// Name of the channel to be looked up 
		bool mAreaVoiceDisabled;
		sessionState *mAudioSession;		// Session state for the current audio session
		bool mAudioSessionChanged;			// set to true when the above pointer gets changed, so observers can be notified.

		sessionState *mNextAudioSession;	// Session state for the audio session we're trying to join

//		std::string mSessionURI;			// URI of the session we're in.
//		std::string mSessionHandle;		// returned by ?
		
		S32 mCurrentParcelLocalID;			// Used to detect parcel boundary crossings
		std::string mCurrentRegionName;		// Used to detect parcel boundary crossings
		
		std::string mConnectorHandle;	// returned by "Create Connector" message
		std::string mAccountHandle;		// returned by login message		
		int 		mNumberOfAliases;
		U32 mCommandCookie;
	
		std::string mVoiceAccountServerURI;
		std::string mVoiceSIPURIHostName;
		
		int mLoginRetryCount;
		
		sessionMap mSessionsByHandle;				// Active sessions, indexed by session handle.  Sessions which are being initiated may not be in this map.
		sessionSet mSessions;						// All sessions, not indexed.  This is the canonical session list.
		
		bool mBuddyListMapPopulated;
		bool mBlockRulesListReceived;
		bool mAutoAcceptRulesListReceived;
		buddyListMap mBuddyListMap;
		
		deviceList mCaptureDevices;
		deviceList mRenderDevices;

		std::string mCaptureDevice;
		std::string mRenderDevice;
		bool mCaptureDeviceDirty;
		bool mRenderDeviceDirty;
		
		// This should be called when the code detects we have changed parcels.
		// It initiates the call to the server that gets the parcel channel.
		void parcelChanged();
		
	void switchChannel(std::string uri = std::string(), bool spatial = true, bool no_reconnect = false, bool is_p2p = false, std::string hash = "");
		void joinSession(sessionState *session);
		
static 	std::string nameFromAvatar(LLVOAvatar *avatar);
static	std::string nameFromID(const LLUUID &id);
static	bool IDFromName(const std::string name, LLUUID &uuid);
static	std::string displayNameFromAvatar(LLVOAvatar *avatar);
		std::string sipURIFromAvatar(LLVOAvatar *avatar);
		std::string sipURIFromName(std::string &name);
		
		// Returns the name portion of the SIP URI if the string looks vaguely like a SIP URI, or an empty string if not.
static	std::string nameFromsipURI(const std::string &uri);		

		bool inSpatialChannel(void);
		std::string getAudioSessionURI();
		std::string getAudioSessionHandle();
				
		void sendPositionalUpdate(void);
		
		void buildSetCaptureDevice(std::ostringstream &stream);
		void buildSetRenderDevice(std::ostringstream &stream);
		void buildLocalAudioUpdates(std::ostringstream &stream);
		
		void clearAllLists();
		void checkFriend(const LLUUID& id);
		void sendFriendsListUpdates();

		// start a text IM session with the specified user
		// This will be asynchronous, the session may be established at a future time.
		sessionState* startUserIMSession(const LLUUID& uuid);
		void sendQueuedTextMessages(sessionState *session);
		
		void enforceTether(void);
		
		bool		mSpatialCoordsDirty;
		
		LLVector3d	mCameraPosition;
		LLVector3d	mCameraRequestedPosition;
		LLVector3	mCameraVelocity;
		LLMatrix3	mCameraRot;

		LLVector3d	mAvatarPosition;
		LLVector3	mAvatarVelocity;
		LLMatrix3	mAvatarRot;
		
		bool		mPTTDirty;
		bool		mPTT;
		
		bool		mUsePTT;
		bool		mPTTIsMiddleMouse;
		KEY			mPTTKey;
		bool		mPTTIsToggle;
		bool		mUserPTTState;
		bool		mMuteMic;
				
		// Set to true when the friends list is known to have changed.
		bool		mFriendsListDirty;
		
		enum
		{
			earLocCamera = 0,		// ear at camera
			earLocAvatar,			// ear at avatar
			earLocMixed				// ear at avatar location/camera direction
		};
		
		S32			mEarLocation;  
		
		bool		mSpeakerVolumeDirty;
		bool		mSpeakerMuteDirty;
		int			mSpeakerVolume;

		int			mMicVolume;
		bool		mMicVolumeDirty;
		
		bool		mVoiceEnabled;
		bool		mWriteInProgress;
		std::string mWriteString;
		
		LLTimer		mUpdateTimer;
		
		BOOL		mLipSyncEnabled;

		std::string	mAPIVersion;

		typedef std::set<LLVoiceClientParticipantObserver*> observer_set_t;
		observer_set_t mParticipantObservers;

		void notifyParticipantObservers();

		typedef std::set<LLVoiceClientStatusObserver*> status_observer_set_t;
		status_observer_set_t mStatusObservers;
		
		void notifyStatusObservers(LLVoiceClientStatusObserver::EStatusType status);

		typedef std::set<LLFriendObserver*> friend_observer_set_t;
		friend_observer_set_t mFriendObservers;
		void notifyFriendObservers();
};

extern LLVoiceClient *gVoiceClient;

#endif //LL_VOICE_CLIENT_H