/** 
 * @file llspeakingindicatormanager.h
 * @author Mike Antipov
 * @brief Interfeace of LLSpeackerIndicator class to be processed depend on avatars are in the same voice channel.
 * Also register/unregister methods for this class are declared
 *
 * $LicenseInfo:firstyear=2010&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, 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 LL_LLSPEAKINGINDICATORMANAGER_H
#define LL_LLSPEAKINGINDICATORMANAGER_H

class SpeakingIndicatorManager;

class LLSpeakingIndicator
{
public:
	virtual ~LLSpeakingIndicator(){}
	virtual void switchIndicator(bool switch_on) = 0;

private:
	friend class SpeakingIndicatorManager;
	// Accessors for target voice session UUID.
	// They are intended to be used only from SpeakingIndicatorManager to ensure target session is 
	// the same indicator was registered with.
	void setTargetSessionID(const LLUUID& session_id) { mTargetSessionID = session_id; }
	const LLUUID& getTargetSessionID() { return mTargetSessionID; }

	/**
	 * session UUID for which indicator should be shown only.
	 *		If it is set, registered indicator will be shown only in voice channel
	 *		which has the same session id (EXT-5562).
	 */
	LLUUID mTargetSessionID;
};

// See EXT-3976.
namespace LLSpeakingIndicatorManager
{
	/**
	 * Stores passed speaking indicator to control its visibility.
	 *
	 * Registered indicator is set visible if an appropriate avatar is in the same voice channel with Agent.
	 * It ignores instances of Agent's indicator.
	 *
	 * @param speaker_id LLUUID of an avatar whose speaker indicator is registered.
	 * @param speaking_indicator instance of the speaker indicator to be registered.
	 * @param session_id session UUID for which indicator should be shown only.
	 *		If this parameter is set registered indicator will be shown only in voice channel
	 *		which has the same session id (EXT-5562).
	 */
	void registerSpeakingIndicator(const LLUUID& speaker_id, LLSpeakingIndicator* const speaking_indicator,
								   const LLUUID& session_id);

	/**
	 * Removes passed speaking indicator from observing.
	 *
	 * @param speaker_id LLUUID of an avatar whose speaker indicator should be unregistered.
	 * @param speaking_indicator instance of the speaker indicator to be unregistered.
	 */
	void unregisterSpeakingIndicator(const LLUUID& speaker_id, const LLSpeakingIndicator* const speaking_indicator);

	/**
	 * Switch on/off registered speaking indicator according to the most current voice client status
	 */
	 void updateSpeakingIndicators();
}

#endif // LL_LLSPEAKINGINDICATORMANAGER_H
