/** 
 * @file llimfloater.cpp
 * @brief LLIMFloater class definition
 *
 * $LicenseInfo:firstyear=2009&license=viewerlgpl$
 * 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
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llimfloater.h"

#include "lldraghandle.h"
#include "llnotificationsutil.h"

#include "llagent.h"
#include "llappviewer.h"
#include "llavataractions.h"
#include "llavatarnamecache.h"
#include "llbutton.h"
#include "llchannelmanager.h"
#include "llchiclet.h"
#include "llchicletbar.h"
#include "llfloaterreg.h"
#include "llfloateravatarpicker.h"
#include "llimfloatercontainer.h" // to replace separate IM Floaters with multifloater container
#include "llinventoryfunctions.h"
//#include "lllayoutstack.h"
#include "llchatentry.h"
#include "lllogchat.h"
#include "llscreenchannel.h"
#include "llsyswellwindow.h"
#include "lltrans.h"
#include "llchathistory.h"
#include "llnotifications.h"
#include "llviewerwindow.h"
#include "lltransientfloatermgr.h"
#include "llinventorymodel.h"
#include "llrootview.h"
#include "llspeakers.h"
#include "llviewerchat.h"
#include "llnotificationmanager.h"

LLIMFloater::LLIMFloater(const LLUUID& session_id)
  : LLIMConversation(session_id),
	mLastMessageIndex(-1),
	mDialog(IM_NOTHING_SPECIAL),
	mInputEditor(NULL),
	mSavedTitle(),
	mTypingStart(),
	mShouldSendTypingState(false),
	mChatHistory(NULL),
	mMeTyping(false),
	mOtherTyping(false),
	mTypingTimer(),
	mTypingTimeoutTimer(),
	mPositioned(false),
	mSessionInitialized(false),
	mStartConferenceInSameFloater(false)
{
	mIsNearbyChat = false;
	initIMSession(session_id);

	setOverlapsScreenChannel(true);

	LLTransientFloaterMgr::getInstance()->addControlView(LLTransientFloaterMgr::IM, this);

	setDocked(true);
}

void LLIMFloater::onFocusLost()
{
	LLIMModel::getInstance()->resetActiveSessionID();

	LLChicletBar::getInstance()->getChicletPanel()->setChicletToggleState(mSessionID, false);
}

void LLIMFloater::onFocusReceived()
{
	LLIMModel::getInstance()->setActiveSessionID(mSessionID);

	LLChicletBar::getInstance()->getChicletPanel()->setChicletToggleState(mSessionID, true);

	if (getVisible())
	{
		LLIMModel::instance().sendNoUnreadMessages(mSessionID);
	}
}

// virtual
void LLIMFloater::refresh()
{
	if (mMeTyping)
	{
		// Time out if user hasn't typed for a while.
		if (mTypingTimeoutTimer.getElapsedTimeF32() > LLAgent::TYPING_TIMEOUT_SECS)
		{
			setTyping(false);
		}
	}
}

// virtual
void LLIMFloater::onClickCloseBtn()
{
	LLIMModel::LLIMSession* session = LLIMModel::instance().findIMSession(
				mSessionID);

	if (session == NULL)
	{
		llwarns << "Empty session." << llendl;
		return;
	}

	bool is_call_with_chat = session->isGroupSessionType()
			|| session->isAdHocSessionType() || session->isP2PSessionType();

	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);

	if (is_call_with_chat && voice_channel != NULL
			&& voice_channel->isActive())
	{
		LLSD payload;
		payload["session_id"] = mSessionID;
		LLNotificationsUtil::add("ConfirmLeaveCall", LLSD(), payload, confirmLeaveCallCallback);
		return;
	}

	LLIMConversation::onClickCloseBtn();
}

/* static */
void LLIMFloater::newIMCallback(const LLSD& data)
{
	if (data["num_unread"].asInteger() > 0 || data["from_id"].asUUID().isNull())
	{
		LLUUID session_id = data["session_id"].asUUID();

		LLIMFloater* floater = LLFloaterReg::findTypedInstance<LLIMFloater>("impanel", session_id);

        // update if visible, otherwise will be updated when opened
		if (floater && floater->getVisible())
		{
			floater->updateMessages();
		}
	}
}

void LLIMFloater::onVisibilityChange(const LLSD& new_visibility)
{
	bool visible = new_visibility.asBoolean();

	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);

	if (visible && voice_channel &&
		voice_channel->getState() == LLVoiceChannel::STATE_CONNECTED)
	{
		LLFloaterReg::showInstance("voice_call", mSessionID);
	}
	else
	{
		LLFloaterReg::hideInstance("voice_call", mSessionID);
	}
}

void LLIMFloater::onSendMsg( LLUICtrl* ctrl, void* userdata )
{
	LLIMFloater* self = (LLIMFloater*) userdata;
	self->sendMsg();
	self->setTyping(false);
}

void LLIMFloater::sendMsg()
{
	if (gAgent.isGodlike()
		|| (mDialog != IM_NOTHING_SPECIAL)
		|| !mOtherParticipantUUID.isNull())
	{
		if (mInputEditor)
		{
			LLWString text = mInputEditor->getWText();
			LLWStringUtil::trim(text);
			LLWStringUtil::replaceChar(text,182,'\n'); // Convert paragraph symbols back into newlines.
			if(!text.empty())
			{
				// Truncate and convert to UTF8 for transport
				std::string utf8_text = wstring_to_utf8str(text);
				utf8_text = utf8str_truncate(utf8_text, MAX_MSG_BUF_SIZE - 1);

				if (mSessionInitialized)
				{
					LLIMModel::sendMessage(utf8_text, mSessionID, mOtherParticipantUUID, mDialog);
				}
				else
				{
					//queue up the message to send once the session is initialized
					mQueuedMsgsForInit.append(utf8_text);
				}

				mInputEditor->setText(LLStringUtil::null);

				updateMessages();
			}
		}
	}
	else
	{
		llinfos << "Cannot send IM to everyone unless you're a god." << llendl;
	}
}

LLIMFloater::~LLIMFloater()
{
	mParticipantsListRefreshConnection.disconnect();
	mVoiceChannelStateChangeConnection.disconnect();
	if(LLVoiceClient::instanceExists())
	{
		LLVoiceClient::getInstance()->removeObserver(this);
	}

	LLTransientFloaterMgr::getInstance()->removeControlView(LLTransientFloaterMgr::IM, this);
}

void LLIMFloater::initIMSession(const LLUUID& session_id)
{
	// Change the floater key to bind it to a new session.
	setKey(session_id);

	mSessionID = session_id;
	mSession = LLIMModel::getInstance()->findIMSession(mSessionID);

	if (mSession)
	{
		mIsP2PChat = mSession->isP2PSessionType();
		mSessionInitialized = mSession->mSessionInitialized;

		mDialog = mSession->mType;
	}
}

void LLIMFloater::initIMFloater()
{
	const LLUUID& other_party_id =
			LLIMModel::getInstance()->getOtherParticipantID(mSessionID);
	if (other_party_id.notNull())
	{
		mOtherParticipantUUID = other_party_id;
	}

	boundVoiceChannel();

	mTypingStart = LLTrans::getString("IM_typing_start_string");

	// Show control panel in torn off floaters only.
	mParticipantListPanel->setVisible(!getHost() && gSavedSettings.getBOOL("IMShowControlPanel"));

	// Disable input editor if session cannot accept text
	if ( mSession && !mSession->mTextIMPossible )
	{
		mInputEditor->setEnabled(FALSE);
		mInputEditor->setLabel(LLTrans::getString("IM_unavailable_text_label"));
	}

	if (mIsP2PChat)
	{
		// look up display name for window title
		LLAvatarNameCache::get(mSession->mOtherParticipantID,
							   boost::bind(&LLIMFloater::onAvatarNameCache,
										   this, _1, _2));
	}
	else
	{
		std::string session_name(LLIMModel::instance().getName(mSessionID));
		updateSessionName(session_name, session_name);

		// For ad hoc conferences we should update the title with participants names.
		if ((IM_SESSION_INVITE == mDialog && !gAgent.isInGroup(mSessionID))
						|| mDialog == IM_SESSION_CONFERENCE_START)
		{
			if (mParticipantsListRefreshConnection.connected())
			{
				mParticipantsListRefreshConnection.disconnect();
			}

			LLAvatarList* avatar_list = getChild<LLAvatarList>("speakers_list");
			mParticipantsListRefreshConnection = avatar_list->setRefreshCompleteCallback(
					boost::bind(&LLIMFloater::onParticipantsListChanged, this, _1));
		}
	}
}

//virtual
BOOL LLIMFloater::postBuild()
{
	LLIMConversation::postBuild();

	mInputEditor = getChild<LLChatEntry>("chat_editor");
	mInputEditor->setMaxTextLength(1023);
	// enable line history support for instant message bar

	LLFontGL* font = LLViewerChat::getChatFont();
	mInputEditor->setFont(font);	
	
	mInputEditor->setFocusReceivedCallback( boost::bind(onInputEditorFocusReceived, _1, this) );
	mInputEditor->setFocusLostCallback( boost::bind(onInputEditorFocusLost, _1, this) );
	mInputEditor->setKeystrokeCallback( boost::bind(onInputEditorKeystroke, _1, this) );
	mInputEditor->setCommitOnFocusLost( FALSE );
	mInputEditor->setPassDelete( TRUE );

	mInputEditor->setCommitCallback(boost::bind(onSendMsg, _1, this));
	
	mChatHistory = getChild<LLChatHistory>("chat_history");

	setDocked(true);

	LLButton* add_btn = getChild<LLButton>("add_btn");

	// Allow to add chat participants depending on the session type
	add_btn->setEnabled(isInviteAllowed());
	add_btn->setClickedCallback(boost::bind(&LLIMFloater::onAddButtonClicked, this));

	childSetAction("voice_call_btn", boost::bind(&LLIMFloater::onCallButtonClicked, this));

	LLVoiceClient::getInstance()->addObserver(this);
	
	//*TODO if session is not initialized yet, add some sort of a warning message like "starting session...blablabla"
	//see LLFloaterIMPanel for how it is done (IB)

	initIMFloater();

	return TRUE;
}

void LLIMFloater::onAddButtonClicked()
{
       LLFloaterAvatarPicker* picker = LLFloaterAvatarPicker::show(boost::bind(&LLIMFloater::addSessionParticipants, this, _1), TRUE, TRUE);
       if (!picker)
       {
               return;
       }

       // Need to disable 'ok' button when selected users are already in conversation.
       picker->setOkBtnEnableCb(boost::bind(&LLIMFloater::canAddSelectedToChat, this, _1));
       LLFloater* root_floater = gFloaterView->getParentFloater(this);
       if (root_floater)
       {
               root_floater->addDependentFloater(picker);
       }
}

bool LLIMFloater::canAddSelectedToChat(const uuid_vec_t& uuids)
{
	if (!mSession
		|| mDialog == IM_SESSION_GROUP_START
		|| mDialog == IM_SESSION_INVITE && gAgent.isInGroup(mSessionID))
	{
		return false;
	}

	if (mIsP2PChat)
	{
		// For a P2P session just check if we are not adding the other participant.

		for (uuid_vec_t::const_iterator id = uuids.begin();
				id != uuids.end(); ++id)
		{
			if (*id == mOtherParticipantUUID)
			{
				return false;
			}
		}
	}
	else
	{
		// For a conference session we need to check against the list from LLSpeakerMgr,
		// because this list may change when participants join or leave the session.

		LLSpeakerMgr::speaker_list_t speaker_list;
		LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
		if (speaker_mgr)
		{
			speaker_mgr->getSpeakerList(&speaker_list, true);
		}

		for (uuid_vec_t::const_iterator id = uuids.begin();
				id != uuids.end(); ++id)
		{
			for (LLSpeakerMgr::speaker_list_t::const_iterator it = speaker_list.begin();
					it != speaker_list.end(); ++it)
			{
				const LLPointer<LLSpeaker>& speaker = *it;
				if (*id == speaker->mID)
				{
					return false;
				}
			}
		}
	}

	return true;
}

void LLIMFloater::addSessionParticipants(const uuid_vec_t& uuids)
{
	if (mIsP2PChat)
	{
		mStartConferenceInSameFloater = true;

		uuid_vec_t temp_ids;

		// Add the initial participant of a P2P session
		temp_ids.push_back(mOtherParticipantUUID);
		temp_ids.insert(temp_ids.end(), uuids.begin(), uuids.end());

		LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);

		// first check whether this is a voice session
		bool is_voice_call = voice_channel != NULL && voice_channel->isActive();

		// then we can close the current session
		onClose(false);

		// Start a new ad hoc voice call if we invite new participants to a P2P call,
		// or start a text chat otherwise.
		if (is_voice_call)
		{
			LLAvatarActions::startAdhocCall(temp_ids, mSessionID);
		}
		else
		{
			LLAvatarActions::startConference(temp_ids, mSessionID);
		}
	}
	else
	{
		inviteToSession(uuids);
	}
}

void LLIMFloater::boundVoiceChannel()
{
	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);
	if(voice_channel)
	{
		mVoiceChannelStateChangeConnection = voice_channel->setStateChangedCallback(
				boost::bind(&LLIMFloater::onVoiceChannelStateChanged, this, _1, _2));

		//call (either p2p, group or ad-hoc) can be already in started state
		bool callIsActive = voice_channel->getState() >= LLVoiceChannel::STATE_CALL_STARTED;
		updateCallBtnState(callIsActive);
	}
}

void LLIMFloater::enableDisableCallBtn()
{
	bool voice_enabled = LLVoiceClient::getInstance()->voiceEnabled()
			&& LLVoiceClient::getInstance()->isVoiceWorking();

	if (mSession)
	{
		bool session_initialized = mSession->mSessionInitialized;
		bool callback_enabled = mSession->mCallBackEnabled;

		BOOL enable_connect =
				session_initialized && voice_enabled && callback_enabled;
		getChildView("voice_call_btn")->setEnabled(enable_connect);
	}
	else
	{
		getChildView("voice_call_btn")->setEnabled(false);
	}
}


void LLIMFloater::onCallButtonClicked()
{
	LLVoiceChannel* voice_channel = LLIMModel::getInstance()->getVoiceChannel(mSessionID);
	if (voice_channel)
	{
		bool is_call_active = voice_channel->getState() >= LLVoiceChannel::STATE_CALL_STARTED;
	    if (is_call_active)
	    {
		    gIMMgr->endCall(mSessionID);
	    }
	    else
	    {
		    gIMMgr->startCall(mSessionID);
	    }
	}
}

void LLIMFloater::onChange(EStatusType status, const std::string &channelURI, bool proximal)
{
	if(status != STATUS_JOINING && status != STATUS_LEFT_CHANNEL)
	{
		enableDisableCallBtn();
	}
}

void LLIMFloater::onVoiceChannelStateChanged(
		const LLVoiceChannel::EState& old_state, const LLVoiceChannel::EState& new_state)
{
	bool callIsActive = new_state >= LLVoiceChannel::STATE_CALL_STARTED;
	updateCallBtnState(callIsActive);
}

void LLIMFloater::updateSessionName(const std::string& ui_title,
									const std::string& ui_label)
{
	mInputEditor->setLabel(LLTrans::getString("IM_to_label") + " " + ui_label);
	setTitle(ui_title);	
}

void LLIMFloater::onAvatarNameCache(const LLUUID& agent_id,
									const LLAvatarName& av_name)
{
	// Use display name only for labels, as the extended name will be in the
	// floater title
	std::string ui_title = av_name.getCompleteName();
	updateSessionName(ui_title, av_name.mDisplayName);
	mTypingStart.setArg("[NAME]", ui_title);
}

void LLIMFloater::onParticipantsListChanged(LLUICtrl* ctrl)
{
	LLAvatarList* avatar_list = dynamic_cast<LLAvatarList*>(ctrl);
	if (!avatar_list)
	{
		return;
	}

	bool all_names_resolved = true;
	std::vector<LLSD> participants_uuids;

	avatar_list->getValues(participants_uuids);

	// Check whether we have all participants names in LLAvatarNameCache
	for (std::vector<LLSD>::const_iterator it = participants_uuids.begin(); it != participants_uuids.end(); ++it)
	{
		const LLUUID& id = it->asUUID();
		LLAvatarName av_name;
		if (!LLAvatarNameCache::get(id, &av_name))
		{
			all_names_resolved = false;

			// If a name is not found in cache, request it and continue the process recursively
			// until all ids are resolved into names.
			LLAvatarNameCache::get(id,
					boost::bind(&LLIMFloater::onParticipantsListChanged, this, avatar_list));
			break;
		}
	}

	if (all_names_resolved)
	{
		std::vector<LLAvatarName> avatar_names;
		std::vector<LLSD>::const_iterator it = participants_uuids.begin();
		for (; it != participants_uuids.end(); ++it)
		{
			const LLUUID& id = it->asUUID();
			LLAvatarName av_name;
			if (LLAvatarNameCache::get(id, &av_name))
			{
				avatar_names.push_back(av_name);
			}
		}

		// We should check whether the vector is not empty to pass the assertion
		// that avatar_names.size() > 0 in LLAvatarActions::buildResidentsString.
		if (!avatar_names.empty())
		{
			std::string ui_title;
			LLAvatarActions::buildResidentsString(avatar_names, ui_title);
			updateSessionName(ui_title, ui_title);
		}
	}
}

//static
LLIMFloater* LLIMFloater::show(const LLUUID& session_id)
{
	closeHiddenIMToasts();

	if (!gIMMgr->hasSession(session_id))
		return NULL;

	if(!isChatMultiTab())
	{
		//hide all
		LLFloaterReg::const_instance_list_t& inst_list = LLFloaterReg::getFloaterList("impanel");
		for (LLFloaterReg::const_instance_list_t::const_iterator iter = inst_list.begin();
			 iter != inst_list.end(); ++iter)
		{
			LLIMFloater* floater = dynamic_cast<LLIMFloater*>(*iter);
			if (floater && floater->isDocked())
			{
				floater->setVisible(false);
			}
		}
	}

	// Test the existence of the floater before we try to create it
	bool exist = findInstance(session_id);

	// Get the floater: this will create the instance if it didn't exist
	LLIMFloater* floater = getInstance(session_id);
	if (!floater)
		return NULL;

	if(isChatMultiTab())
	{
		LLIMFloaterContainer* floater_container = LLIMFloaterContainer::getInstance();

		// Do not add again existing floaters
		if (!exist)
		{
			//		LLTabContainer::eInsertionPoint i_pt = user_initiated ? LLTabContainer::RIGHT_OF_CURRENT : LLTabContainer::END;
			// TODO: mantipov: use LLTabContainer::RIGHT_OF_CURRENT if it exists
			LLTabContainer::eInsertionPoint i_pt = LLTabContainer::END;
			if (floater_container)
			{
				floater_container->addFloater(floater, TRUE, i_pt);
			}
		}
		
		// Add a conversation list item in the left pane: nothing will be done if already in there
		// but relevant clean up will be done to ensure consistency of the conversation list
		floater_container->addConversationListItem(floater->getTitle(), session_id, floater);

		floater->openFloater(floater->getKey());
	}
	else
	{
		// Docking may move chat window, hide it before moving, or user will see how window "jumps"
		floater->setVisible(false);

		if (floater->getDockControl() == NULL)
		{
			LLChiclet* chiclet =
					LLChicletBar::getInstance()->getChicletPanel()->findChiclet<LLChiclet>(
							session_id);
			if (chiclet == NULL)
			{
				llerror("Dock chiclet for LLIMFloater doesn't exists", 0);
			}
			else
			{
				LLChicletBar::getInstance()->getChicletPanel()->scrollToChiclet(chiclet);
			}

			floater->setDockControl(new LLDockControl(chiclet, floater, floater->getDockTongue(),
					LLDockControl::BOTTOM));
		}

		// window is positioned, now we can show it.
	}
	floater->setVisible(TRUE);

	return floater;
}
//static
LLIMFloater* LLIMFloater::findInstance(const LLUUID& session_id)
{
    LLIMFloater* conversation =
    		LLFloaterReg::findTypedInstance<LLIMFloater>("impanel", session_id);

	return conversation;
}

LLIMFloater* LLIMFloater::getInstance(const LLUUID& session_id)
{
	LLIMFloater* conversation =
				LLFloaterReg::getTypedInstance<LLIMFloater>("impanel", session_id);

	return conversation;
}

void LLIMFloater::onClose(bool app_quitting)
{
	setTyping(false);

	// The source of much argument and design thrashing
	// Should the window hide or the session close when the X is clicked?
	//
	// Last change:
	// EXT-3516 X Button should end IM session, _ button should hide
	gIMMgr->leaveSession(mSessionID);

	// Clean up the conversation *after* the session has been ended
	LLIMConversation::onClose(app_quitting);
}

void LLIMFloater::setDocked(bool docked, bool pop_on_undock)
{
	// update notification channel state
	LLNotificationsUI::LLScreenChannel* channel = static_cast<LLNotificationsUI::LLScreenChannel*>
		(LLNotificationsUI::LLChannelManager::getInstance()->
											findChannelByID(LLUUID(gSavedSettings.getString("NotificationChannelUUID"))));
	
	if(!isChatMultiTab())
	{
		LLTransientDockableFloater::setDocked(docked, pop_on_undock);
	}

	// update notification channel state
	if(channel)
	{
		channel->updateShowToastsState();
		channel->redrawToasts();
	}
}

void LLIMFloater::setVisible(BOOL visible)
{
	LLNotificationsUI::LLScreenChannel* channel = static_cast<LLNotificationsUI::LLScreenChannel*>
		(LLNotificationsUI::LLChannelManager::getInstance()->
											findChannelByID(LLUUID(gSavedSettings.getString("NotificationChannelUUID"))));
	LLTransientDockableFloater::setVisible(visible);

	// update notification channel state
	if(channel)
	{
		channel->updateShowToastsState();
		channel->redrawToasts();
	}

	BOOL is_minimized = visible && isChatMultiTab()
		? LLIMFloaterContainer::getInstance()->isMinimized()
		: !visible;

	if (!is_minimized && mChatHistory && mInputEditor)
	{
		//only if floater was construced and initialized from xml
		updateMessages();
		//prevent stealing focus when opening a background IM tab (EXT-5387, checking focus for EXT-6781)
		if (!isChatMultiTab() || hasFocus())
		{
			mInputEditor->setFocus(TRUE);
		}
	}

	if(!visible)
	{
		LLIMChiclet* chiclet = LLChicletBar::getInstance()->getChicletPanel()->findChiclet<LLIMChiclet>(mSessionID);
		if(chiclet)
		{
			chiclet->setToggleState(false);
		}
	}
}

BOOL LLIMFloater::getVisible()
{
	bool visible;

	if(isChatMultiTab())
	{
		LLIMFloaterContainer* im_container =
				LLIMFloaterContainer::getInstance();
		
		// Treat inactive floater as invisible.
		bool is_active = im_container->getActiveFloater() == this;
	
		//torn off floater is always inactive
		if (!is_active && getHost() != im_container)
		{
			visible = LLTransientDockableFloater::getVisible();
		}
		else
		{
			// getVisible() returns TRUE when Tabbed IM window is minimized.
			visible = is_active && !im_container->isMinimized()
						&& im_container->getVisible();
		}
	}
	else
	{
		visible = LLTransientDockableFloater::getVisible();
	}

	return visible;
}

//static
bool LLIMFloater::toggle(const LLUUID& session_id)
{
	if(!isChatMultiTab())
	{
		LLIMFloater* floater = LLFloaterReg::findTypedInstance<LLIMFloater>(
				"impanel", session_id);
		if (floater && floater->getVisible() && floater->hasFocus())
		{
			// clicking on chiclet to close floater just hides it to maintain existing
			// scroll/text entry state
			floater->setVisible(false);
			return false;
		}
		else if(floater && (!floater->isDocked() || floater->getVisible() && !floater->hasFocus()))
		{
			floater->setVisible(TRUE);
			floater->setFocus(TRUE);
			return true;
		}
	}

	// ensure the list of messages is updated when floater is made visible
	show(session_id);
	return true;
}

void LLIMFloater::sessionInitReplyReceived(const LLUUID& im_session_id)
{
	mSessionInitialized = true;

	//will be different only for an ad-hoc im session
	if (mSessionID != im_session_id)
	{
		initIMSession(im_session_id);

		buildParticipantList();
	}

	initIMFloater();

	//*TODO here we should remove "starting session..." warning message if we added it in postBuild() (IB)

	//need to send delayed messaged collected while waiting for session initialization
	if (mQueuedMsgsForInit.size())
	{
		LLSD::array_iterator iter;
		for ( iter = mQueuedMsgsForInit.beginArray();
				iter != mQueuedMsgsForInit.endArray(); ++iter)
		{
			LLIMModel::sendMessage(iter->asString(), mSessionID,
				mOtherParticipantUUID, mDialog);
		}
	}
}

void LLIMFloater::appendMessage(const LLChat& chat, const LLSD &args)
{
	LLChat& tmp_chat = const_cast<LLChat&>(chat);

	if (!chat.mMuted)
	{
		tmp_chat.mFromName = chat.mFromName;
		LLSD chat_args;
		if (args) chat_args = args;
		chat_args["use_plain_text_chat_history"] =
				gSavedSettings.getBOOL("PlainTextChatHistory");
		chat_args["show_time"] = gSavedSettings.getBOOL("IMShowTime");
		chat_args["show_names_for_p2p_conv"] = !mIsP2PChat
				|| gSavedSettings.getBOOL("IMShowNamesForP2PConv");

		mChatHistory->appendMessage(chat, chat_args);
	}
}

void LLIMFloater::updateMessages()
{
	std::list<LLSD> messages;

	// we shouldn't reset unread message counters if IM floater doesn't have focus
    LLIMModel::instance().getMessages(
    		mSessionID, messages, mLastMessageIndex + 1, hasFocus());

	if (messages.size())
	{
		std::ostringstream message;
		std::list<LLSD>::const_reverse_iterator iter = messages.rbegin();
		std::list<LLSD>::const_reverse_iterator iter_end = messages.rend();
		for (; iter != iter_end; ++iter)
		{
			LLSD msg = *iter;

			std::string time = msg["time"].asString();
			LLUUID from_id = msg["from_id"].asUUID();
			std::string from = msg["from"].asString();
			std::string message = msg["message"].asString();
			bool is_history = msg["is_history"].asBoolean();

			LLChat chat;
			chat.mFromID = from_id;
			chat.mSessionID = mSessionID;
			chat.mFromName = from;
			chat.mTimeStr = time;
			chat.mChatStyle = is_history ? CHAT_STYLE_HISTORY : chat.mChatStyle;

			// process offer notification
			if (msg.has("notification_id"))
			{
				chat.mNotifId = msg["notification_id"].asUUID();
				// if notification exists - embed it
				if (LLNotificationsUtil::find(chat.mNotifId) != NULL)
				{
					// remove embedded notification from channel
					LLNotificationsUI::LLScreenChannel* channel = static_cast<LLNotificationsUI::LLScreenChannel*>
							(LLNotificationsUI::LLChannelManager::getInstance()->
																findChannelByID(LLUUID(gSavedSettings.getString("NotificationChannelUUID"))));
					if (getVisible())
					{
						// toast will be automatically closed since it is not storable toast
						channel->hideToast(chat.mNotifId);
					}
				}
				// if notification doesn't exist - try to use next message which should be log entry
				else
				{
					continue;
				}
			}
			//process text message
			else
			{
				chat.mText = message;
			}
			
			appendMessage(chat);
			mLastMessageIndex = msg["index"].asInteger();

			// if it is a notification - next message is a notification history log, so skip it
			if (chat.mNotifId.notNull() && LLNotificationsUtil::find(chat.mNotifId) != NULL)
			{
				if (++iter == iter_end)
			    {
				    break;
			    }
			    else
			    {
				    mLastMessageIndex++;
			    }
		    }
	    }
    }
}

void LLIMFloater::reloadMessages()
{
	mChatHistory->clear();
	mLastMessageIndex = -1;
	updateMessages();
	mInputEditor->setFont(LLViewerChat::getChatFont());
}

// static
void LLIMFloater::onInputEditorFocusReceived( LLFocusableElement* caller, void* userdata )
{
	LLIMFloater* self= (LLIMFloater*) userdata;

	// Allow enabling the LLIMFloater input editor only if session can accept text
	LLIMModel::LLIMSession* im_session =
		LLIMModel::instance().findIMSession(self->mSessionID);
	//TODO: While disabled lllineeditor can receive focus we need to check if it is enabled (EK)
	if( im_session && im_session->mTextIMPossible && self->mInputEditor->getEnabled())
	{
		//in disconnected state IM input editor should be disabled
		self->mInputEditor->setEnabled(!gDisconnected);
	}
}

// static
void LLIMFloater::onInputEditorFocusLost(LLFocusableElement* caller, void* userdata)
{
	LLIMFloater* self = (LLIMFloater*) userdata;
	self->setTyping(false);
}

// static
void LLIMFloater::onInputEditorKeystroke(LLTextEditor* caller, void* userdata)
{
	LLIMFloater* self = (LLIMFloater*) userdata;
	std::string text = self->mInputEditor->getText();

	// Deleting all text counts as stopping typing.
	self->setTyping(!text.empty());
}

void LLIMFloater::setTyping(bool typing)
{
	if (typing)
	{
		// Started or proceeded typing, reset the typing timeout timer
		mTypingTimeoutTimer.reset();
	}

	if (mMeTyping != typing)
	{
		// Typing state is changed
		mMeTyping = typing;
		// So, should send current state
		mShouldSendTypingState = true;
		// In case typing is started, send state after some delay
		mTypingTimer.reset();
	}

	// Don't want to send typing indicators to multiple people, potentially too
	// much network traffic. Only send in person-to-person IMs.
	if (mShouldSendTypingState && mDialog == IM_NOTHING_SPECIAL)
	{
		// Still typing, send 'start typing' notification or
		// send 'stop typing' notification immediately
		if (!mMeTyping || mTypingTimer.getElapsedTimeF32() > 1.f)
		{
			LLIMModel::instance().sendTypingState(mSessionID,
					mOtherParticipantUUID, mMeTyping);
			mShouldSendTypingState = false;

		}
	}

	if (!mIsNearbyChat)
	{
		LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
		if (speaker_mgr)
		{
			speaker_mgr->setSpeakerTyping(gAgent.getID(), FALSE);
		}
	}
}

void LLIMFloater::processIMTyping(const LLIMInfo* im_info, BOOL typing)
{
	if (typing)
	{
		// other user started typing
		addTypingIndicator(im_info);
	}
	else
	{
		// other user stopped typing
		removeTypingIndicator(im_info);
	}
}

void LLIMFloater::processAgentListUpdates(const LLSD& body)
{
	if (body.isMap() && body.has("agent_updates") && body["agent_updates"].isMap())
	{
		LLSD agent_data = body["agent_updates"].get(gAgentID.asString());
		if (agent_data.isMap() && agent_data.has("info"))
		{
			LLSD agent_info = agent_data["info"];

			if (agent_info.has("mutes"))
			{
				BOOL moderator_muted_text = agent_info["mutes"]["text"].asBoolean();
				mInputEditor->setEnabled(!moderator_muted_text);
				std::string label;
				if (moderator_muted_text)
					label = LLTrans::getString("IM_muted_text_label");
				else
					label = LLTrans::getString("IM_to_label") + " " + LLIMModel::instance().getName(mSessionID);
				mInputEditor->setLabel(label);

				if (moderator_muted_text)
					LLNotificationsUtil::add("TextChatIsMutedByModerator");
			}
		}
	}
}

void LLIMFloater::processSessionUpdate(const LLSD& session_update)
{
	// *TODO : verify following code when moderated mode will be implemented
	if (false && session_update.has("moderated_mode") &&
			session_update["moderated_mode"].has("voice"))
	{
		BOOL voice_moderated = session_update["moderated_mode"]["voice"];
		const std::string session_label = LLIMModel::instance().getName(mSessionID);

		if (voice_moderated)
		{
			setTitle(session_label + std::string(" ")
							+ LLTrans::getString("IM_moderated_chat_label"));
		}
		else
		{
			setTitle(session_label);
		}

		// *TODO : uncomment this when/if LLPanelActiveSpeakers panel will be added
		//update the speakers dropdown too
		//mSpeakerPanel->setVoiceModerationCtrlMode(voice_moderated);
	}
}

// virtual
BOOL LLIMFloater::handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
									EDragAndDropType cargo_type,
									void* cargo_data,
									EAcceptance* accept,
									std::string& tooltip_msg)
{
	if (cargo_type == DAD_PERSON)
	{
		if (dropPerson(static_cast<LLUUID*>(cargo_data), drop))
		{
			*accept = ACCEPT_YES_MULTI;
		}
		else
		{
			*accept = ACCEPT_NO;
		}
	}
	else if (mDialog == IM_NOTHING_SPECIAL)
	{
		LLToolDragAndDrop::handleGiveDragAndDrop(mOtherParticipantUUID, mSessionID, drop,
				cargo_type, cargo_data, accept);
	}

	return TRUE;
}

bool LLIMFloater::dropPerson(LLUUID* person_id, bool drop)
{
	bool res = person_id && person_id->notNull();
	if(res)
	{
		uuid_vec_t ids;
		ids.push_back(*person_id);

		res = canAddSelectedToChat(ids);
		if(res && drop)
		{
			addSessionParticipants(ids);
		}
	}

	return res;
}

BOOL LLIMFloater::isInviteAllowed() const
{
	return ((IM_SESSION_CONFERENCE_START == mDialog)
			 || (IM_SESSION_INVITE == mDialog && !gAgent.isInGroup(mSessionID))
			 || mIsP2PChat);
}

class LLSessionInviteResponder: public LLHTTPClient::Responder
{
public:
	LLSessionInviteResponder(const LLUUID& session_id)
	{
		mSessionID = session_id;
	}

	void error(U32 statusNum, const std::string& reason)
	{
		llinfos << "Error inviting all agents to session" << llendl;
		//throw something back to the viewer here?
	}

private:
	LLUUID mSessionID;
};

BOOL LLIMFloater::inviteToSession(const uuid_vec_t& ids)
{
	LLViewerRegion* region = gAgent.getRegion();
	bool is_region_exist = region != NULL;

	if (is_region_exist)
	{
		S32 count = ids.size();

		if (isInviteAllowed() && (count > 0))
		{
			llinfos << "LLIMFloater::inviteToSession() - inviting participants" << llendl;

			std::string url = region->getCapability("ChatSessionRequest");

			LLSD data;

			data["params"] = LLSD::emptyArray();
			for (int i = 0; i < count; i++)
			{
				data["params"].append(ids[i]);
			}

			data["method"] = "invite";
			data["session-id"] = mSessionID;
			LLHTTPClient::post(
					url,
					data,
					new LLSessionInviteResponder(mSessionID));
		}
		else
		{
			llinfos << "LLIMFloater::inviteToSession -"
					<< " no need to invite agents for "
					<< mDialog << llendl;
			// successful add, because everyone that needed to get added
			// was added.
		}
	}

	return is_region_exist;
}

void LLIMFloater::addTypingIndicator(const LLIMInfo* im_info)
{
	// We may have lost a "stop-typing" packet, don't add it twice
	if (im_info && !mOtherTyping)
	{
		mOtherTyping = true;

		// Save and set new title
		mSavedTitle = getTitle();
		setTitle(mTypingStart);

		// Update speaker
		LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
		if (speaker_mgr)
		{
			speaker_mgr->setSpeakerTyping(im_info->mFromID, TRUE);
		}
	}
}

void LLIMFloater::removeTypingIndicator(const LLIMInfo* im_info)
{
	if (mOtherTyping)
	{
		mOtherTyping = false;

		// Revert the title to saved one
		setTitle(mSavedTitle);

		if (im_info)
		{
			// Update speaker
			LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
			if (speaker_mgr)
			{
				speaker_mgr->setSpeakerTyping(im_info->mFromID, FALSE);
			}
		}
	}
}

// static
void LLIMFloater::closeHiddenIMToasts()
{
	class IMToastMatcher: public LLNotificationsUI::LLScreenChannel::Matcher
	{
	public:
		bool matches(const LLNotificationPtr notification) const
		{
			// "notifytoast" type of notifications is reserved for IM notifications
			return "notifytoast" == notification->getType();
		}
	};

	LLNotificationsUI::LLScreenChannel* channel =
			LLNotificationsUI::LLChannelManager::getNotificationScreenChannel();
	if (channel != NULL)
	{
		channel->closeHiddenToasts(IMToastMatcher());
	}
}
// static
void LLIMFloater::confirmLeaveCallCallback(const LLSD& notification, const LLSD& response)
{
	S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
	const LLSD& payload = notification["payload"];
	LLUUID session_id = payload["session_id"];

	LLFloater* im_floater = findInstance(session_id);
	if (option == 0 && im_floater != NULL)
	{
		im_floater->closeFloater();
	}

	return;
}

// static
void LLIMFloater::sRemoveTypingIndicator(const LLSD& data)
{
	LLUUID session_id = data["session_id"];
	if (session_id.isNull())
		return;

	LLUUID from_id = data["from_id"];
	if (gAgentID == from_id || LLUUID::null == from_id)
		return;

	LLIMFloater* floater = LLIMFloater::findInstance(session_id);
	if (!floater)
		return;

	if (IM_NOTHING_SPECIAL != floater->mDialog)
		return;

	floater->removeTypingIndicator();
}

void LLIMFloater::onIMChicletCreated( const LLUUID& session_id )
{
	LLIMFloater::addToHost(session_id);
}
void LLIMFloater::addToHost(const LLUUID& session_id)
{
	if (LLIMConversation::isChatMultiTab())
	{
		LLIMFloaterContainer* im_box = LLIMFloaterContainer::findInstance();
		if (!im_box)
	    {
			im_box = LLIMFloaterContainer::getInstance();
	    }

		if (im_box && !LLIMFloater::findInstance(session_id))
		{
			LLIMFloater* new_tab = LLIMFloater::getInstance(session_id);
			im_box->addFloater(new_tab, FALSE, LLTabContainer::END);
		}
	}
}