/** 
 * @file llimpanel.cpp
 * @brief LLIMPanel class definition
 *
 * Copyright (c) 2001-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 */

#include "llviewerprecompiledheaders.h"

#include "llimpanel.h"

#include "indra_constants.h"
#include "llfocusmgr.h"
#include "llfontgl.h"
#include "llrect.h"
#include "llerror.h"
#include "llstring.h"
#include "message.h"
#include "lltextbox.h"

#include "llagent.h"
#include "llbutton.h"
#include "llcallingcard.h"
#include "llconsole.h"
#include "llfloater.h"
#include "llinventory.h"
#include "llinventorymodel.h"
#include "llinventoryview.h"
#include "llfloateravatarinfo.h"
#include "llkeyboard.h"
#include "lllineeditor.h"
#include "llresmgr.h"
#include "lltabcontainer.h"
#include "llimview.h"
#include "llviewertexteditor.h"
#include "llviewermessage.h"
#include "llviewerstats.h"
#include "viewer.h"
#include "llvieweruictrlfactory.h"
#include "lllogchat.h"
#include "llfloaterhtml.h"
#include "llweb.h"

//
// Constants
//
const S32 LINE_HEIGHT = 16;
const S32 MIN_WIDTH = 200;
const S32 MIN_HEIGHT = 130;

//
// Statics
//
//
static LLString sTitleString = "Instant Message with [NAME]";
static LLString sTypingStartString = "[NAME]: ...";
static LLString sSessionStartString = "Starting session with [NAME] please wait.";

void session_starter_helper(const LLUUID& temp_session_id,
							const LLUUID& other_participant_id,
							EInstantMessage im_type)
{
	LLMessageSystem *msg = gMessageSystem;

	msg->newMessageFast(_PREHASH_ImprovedInstantMessage);
	msg->nextBlockFast(_PREHASH_AgentData);
	msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
	msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());

	msg->nextBlockFast(_PREHASH_MessageBlock);
	msg->addBOOLFast(_PREHASH_FromGroup, FALSE);
	msg->addUUIDFast(_PREHASH_ToAgentID, other_participant_id);
	msg->addU8Fast(_PREHASH_Offline, IM_ONLINE);
	msg->addU8Fast(_PREHASH_Dialog, im_type);
	msg->addUUIDFast(_PREHASH_ID, temp_session_id);
	msg->addU32Fast(_PREHASH_Timestamp, NO_TIMESTAMP); // no timestamp necessary

	std::string name;
	gAgent.buildFullname(name);

	msg->addStringFast(_PREHASH_FromAgentName, name);
	msg->addStringFast(_PREHASH_Message, LLString::null);
	msg->addU32Fast(_PREHASH_ParentEstateID, 0);
	msg->addUUIDFast(_PREHASH_RegionID, LLUUID::null);
	msg->addVector3Fast(_PREHASH_Position, gAgent.getPositionAgent());
}

// Returns true if any messages were sent, false otherwise.
// Is sort of equivalent to "does the server need to do anything?"
bool send_start_session_messages(const LLUUID& temp_session_id,
								 const LLUUID& other_participant_id,
								 const LLDynamicArray<LLUUID>& ids,
								 EInstantMessage dialog)
{
	if ( (dialog == IM_SESSION_911_START) ||
		 (dialog == IM_SESSION_GROUP_START) ||
		 (dialog == IM_SESSION_CONFERENCE_START) )
	{
		S32 count = ids.size();
		S32 bucket_size = UUID_BYTES * count;
		U8* bucket;
		U8* pos;

		session_starter_helper(temp_session_id,
							   other_participant_id,
							   dialog);

		switch(dialog)
		{
		case IM_SESSION_GROUP_START:
		case IM_SESSION_911_START:
			gMessageSystem->addBinaryDataFast(_PREHASH_BinaryBucket,
											  EMPTY_BINARY_BUCKET,
											  EMPTY_BINARY_BUCKET_SIZE);
			break;
		case IM_SESSION_CONFERENCE_START:
			bucket = new U8[bucket_size];
			pos = bucket;

			// *FIX: this could suffer from endian issues
			for(S32 i = 0; i < count; ++i)
			{
				memcpy(pos, &(ids.get(i)), UUID_BYTES);
				pos += UUID_BYTES;
			}
			gMessageSystem->addBinaryDataFast(_PREHASH_BinaryBucket,
											  bucket,
											  bucket_size);
			delete[] bucket;

			break;
		default:
			break;
		}
		gAgent.sendReliableMessage();

		return true;
	}

	return false;
}

// Member Functions
//

LLFloaterIMPanel::LLFloaterIMPanel(const std::string& name,
								   const LLRect& rect,
								   const std::string& session_label,
								   const LLUUID& session_id,
								   const LLUUID& other_participant_id,
								   EInstantMessage dialog) :
	LLFloater(name, rect, session_label),
	mInputEditor(NULL),
	mHistoryEditor(NULL),
	mSessionUUID(session_id),
	mOtherParticipantUUID(other_participant_id),
	mDialog(dialog),
	mTyping(FALSE),
	mOtherTyping(FALSE),
	mTypingLineStartIndex(0),
	mSentTypingState(TRUE),
	mFirstKeystrokeTimer(),
	mLastKeystrokeTimer(),
	mSessionInitialized(FALSE),
	mSessionInitRequested(FALSE)
{
	init(session_label);
}

LLFloaterIMPanel::LLFloaterIMPanel(const std::string& name,
								   const LLRect& rect,
								   const std::string& session_label,
								   const LLUUID& session_id,
								   const LLUUID& other_participant_id,
								   const LLDynamicArray<LLUUID>& ids,
								   EInstantMessage dialog) :
	LLFloater(name, rect, session_label),
	mInputEditor(NULL),
	mHistoryEditor(NULL),
	mSessionUUID(session_id),
	mOtherParticipantUUID(other_participant_id),
	mDialog(dialog),
	mTyping(FALSE),
	mOtherTyping(FALSE),
	mTypingLineStartIndex(0),
	mSentTypingState(TRUE),
	mFirstKeystrokeTimer(),
	mLastKeystrokeTimer(),
	mSessionInitialized(FALSE),
	mSessionInitRequested(FALSE)
{
	init(session_label);

	mSessionInitialTargetIDs = ids;
}


void LLFloaterIMPanel::init(const LLString& session_label)
{
	gUICtrlFactory->buildFloater(this,
								 "floater_instant_message.xml",
								 NULL,
								 FALSE);

	setLabel(session_label);
	setTitle(session_label);
	mInputEditor->setMaxTextLength(1023);

	if ( gSavedPerAccountSettings.getBOOL("LogShowHistory") )
	{
		LLLogChat::loadHistory(session_label,
							   &chatFromLogFile,
							   (void *)this);
	}

	if(IM_SESSION_911_START == mDialog)
	{
		LLTextBox* live_help_text = 
			LLUICtrlFactory::getTextBoxByName(this, "live_help_dialog");
		addHistoryLine(live_help_text->getText());
	}
}


BOOL LLFloaterIMPanel::postBuild() 
{
	requires("chat_editor", WIDGET_TYPE_LINE_EDITOR);
	requires("profile_btn", WIDGET_TYPE_BUTTON);
	requires("close_btn", WIDGET_TYPE_BUTTON);
	requires("im_history", WIDGET_TYPE_TEXT_EDITOR);
	requires("live_help_dialog", WIDGET_TYPE_TEXT_BOX);
	requires("title_string", WIDGET_TYPE_TEXT_BOX);
	requires("typing_start_string", WIDGET_TYPE_TEXT_BOX);
	requires("session_start_string", WIDGET_TYPE_TEXT_BOX);
	requires("teleport_btn", WIDGET_TYPE_BUTTON);

	if (checkRequirements())
	{
		mInputEditor = LLUICtrlFactory::getLineEditorByName(this, "chat_editor");
		mInputEditor->setFocusReceivedCallback( onInputEditorFocusReceived );
		mInputEditor->setFocusLostCallback( onInputEditorFocusLost );
		mInputEditor->setKeystrokeCallback( onInputEditorKeystroke );
		mInputEditor->setCallbackUserData(this);
		mInputEditor->setCommitOnFocusLost( FALSE );
		mInputEditor->setRevertOnEsc( FALSE );

		LLButton* profile_btn = LLUICtrlFactory::getButtonByName(this, "profile_btn");
		profile_btn->setClickedCallback(&LLFloaterIMPanel::onClickProfile, this);

		LLButton* close_btn = LLUICtrlFactory::getButtonByName(this, "close_btn");
		close_btn->setClickedCallback(&LLFloaterIMPanel::onClickClose, this);

		LLButton* tp_btn = LLUICtrlFactory::getButtonByName(this, "teleport_btn");
		tp_btn->setClickedCallback(&LLFloaterIMPanel::onTeleport, this);
		tp_btn->setVisible(FALSE);
		tp_btn->setEnabled(FALSE);

		mHistoryEditor = LLViewerUICtrlFactory::getViewerTextEditorByName(this, "im_history");
		mHistoryEditor->setParseHTML(TRUE);

		if (IM_SESSION_GROUP_START == mDialog
			|| IM_SESSION_911_START == mDialog)
		{
			profile_btn->setEnabled(FALSE);
		}
		LLTextBox* title = LLUICtrlFactory::getTextBoxByName(this, "title_string");
		sTitleString = title->getText();
		
		LLTextBox* typing_start = LLUICtrlFactory::getTextBoxByName(this, "typing_start_string");
				
		sTypingStartString = typing_start->getText();

		LLTextBox* session_start = LLUICtrlFactory::getTextBoxByName(
			this,
			"session_start_string");
		sSessionStartString = session_start->getText();

		return TRUE;
	}

	return FALSE;
}

// virtual
void LLFloaterIMPanel::draw()
{
	if (mTyping)
	{
		// Time out if user hasn't typed for a while.
		if (mLastKeystrokeTimer.getElapsedTimeF32() > LLAgent::TYPING_TIMEOUT_SECS)
		{
			setTyping(FALSE);
		}

		// If we are typing, and it's been a little while, send the
		// typing indicator
		if (!mSentTypingState
			&& mFirstKeystrokeTimer.getElapsedTimeF32() > 1.f)
		{
			sendTypingState(TRUE);
			mSentTypingState = TRUE;
		}
	}

	LLFloater::draw();
}


BOOL LLFloaterIMPanel::addParticipants(const LLDynamicArray<LLUUID>& ids)
{
	S32 count = ids.count();

	if( isAddAllowed() && (count > 0) )
	{
		llinfos << "LLFloaterIMPanel::addParticipants() - adding participants" << llendl;
		const S32 MAX_AGENTS = 50;
		if(count > MAX_AGENTS) return FALSE;

		LLMessageSystem *msg = gMessageSystem;
		msg->newMessageFast(_PREHASH_ImprovedInstantMessage);
		msg->nextBlockFast(_PREHASH_AgentData);
		msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
		msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
		msg->nextBlockFast(_PREHASH_MessageBlock);
		msg->addBOOLFast(_PREHASH_FromGroup, FALSE);
		msg->addUUIDFast(_PREHASH_ToAgentID, mOtherParticipantUUID);
		msg->addU8Fast(_PREHASH_Offline, IM_ONLINE);
		msg->addU8Fast(_PREHASH_Dialog, IM_SESSION_ADD);
		msg->addUUIDFast(_PREHASH_ID, mSessionUUID);
		msg->addU32Fast(_PREHASH_Timestamp, NO_TIMESTAMP); // no timestamp necessary
		std::string name;
		gAgent.buildFullname(name);
		msg->addStringFast(_PREHASH_FromAgentName, name);
		msg->addStringFast(_PREHASH_Message, LLString::null);
		msg->addU32Fast(_PREHASH_ParentEstateID, 0);
		msg->addUUIDFast(_PREHASH_RegionID, LLUUID::null);
		msg->addVector3Fast(_PREHASH_Position, gAgent.getPositionAgent());

		// *FIX: this could suffer from endian issues
		S32 bucket_size = UUID_BYTES * count;
		U8* bucket = new U8[bucket_size];
		U8* pos = bucket;
		for(S32 i = 0; i < count; ++i)
		{
			memcpy(pos, &(ids.get(i)), UUID_BYTES);
			pos += UUID_BYTES;
		}
		msg->addBinaryDataFast(_PREHASH_BinaryBucket,
							   bucket,
							   bucket_size);
		delete[] bucket;
		gAgent.sendReliableMessage();
	}
	else
	{
		llinfos << "LLFloaterIMPanel::addParticipants() - no need to add agents for "
				<< mDialog << llendl;
		// successful add, because everyone that needed to get added
		// was added.
	}

	return TRUE;
}

void LLFloaterIMPanel::addHistoryLine(const std::string &utf8msg, const LLColor4& color, bool log_to_file)
{
	LLMultiFloater* hostp = getHost();
	if( !getVisible() && hostp && log_to_file)
	{
		// Only flash for logged ("real") messages
		LLTabContainer* parent = (LLTabContainer*) getParent();
		parent->setTabPanelFlashing( this, TRUE );
	}

	// Now we're adding the actual line of text, so erase the 
	// "Foo is typing..." text segment, and the optional timestamp
	// if it was present. JC
	removeTypingIndicator();

	// Actually add the line
	LLString timestring;
	bool prepend_newline = true;
	if (gSavedSettings.getBOOL("IMShowTimestamps"))
	{
		timestring = mHistoryEditor->appendTime(prepend_newline);
		prepend_newline = false;
	}
	mHistoryEditor->appendColoredText(utf8msg, false, prepend_newline, color);
	
	if (log_to_file
		&& gSavedPerAccountSettings.getBOOL("LogInstantMessages") ) 
	{
		LLString histstr =  timestring + utf8msg;

		LLLogChat::saveHistory(getTitle(),histstr);
	}
}


void LLFloaterIMPanel::setVisible(BOOL b)
{
	LLPanel::setVisible(b);

	LLMultiFloater* hostp = getHost();
	if( b && hostp )
	{
		LLTabContainer* parent = (LLTabContainer*) getParent();

		// When this tab is displayed, you can stop flashing.
		parent->setTabPanelFlashing( this, FALSE );

		/* Don't change containing floater title - leave it "Instant Message" JC
		LLUIString title = sTitleString;
		title.setArg("[NAME]", mSessionLabel);
		hostp->setTitle( title );
		*/
	}
}


void LLFloaterIMPanel::setInputFocus( BOOL b )
{
	mInputEditor->setFocus( b );
}


void LLFloaterIMPanel::selectAll()
{
	mInputEditor->selectAll();
}


void LLFloaterIMPanel::selectNone()
{
	mInputEditor->deselect();
}


BOOL LLFloaterIMPanel::handleKeyHere( KEY key, MASK mask, BOOL called_from_parent )
{
	BOOL handled = FALSE;
	if( getVisible() && mEnabled && !called_from_parent && gFocusMgr.childHasKeyboardFocus(this))
	{
		if( KEY_RETURN == key && mask == MASK_NONE)
		{
			sendMsg();
			handled = TRUE;

			// Close talk panels on hitting return
			// but not shift-return or control-return
			if ( !gSavedSettings.getBOOL("PinTalkViewOpen") && !(mask & MASK_CONTROL) && !(mask & MASK_SHIFT) )
			{
				gIMView->toggle(NULL);
			}
		}
		else if ( KEY_ESCAPE == key )
		{
			handled = TRUE;
			gFocusMgr.setKeyboardFocus(NULL, NULL);

			// Close talk panel with escape
			if( !gSavedSettings.getBOOL("PinTalkViewOpen") )
			{
				gIMView->toggle(NULL);
			}
		}
	}

	// May need to call base class LLPanel::handleKeyHere if not handled
	// in order to tab between buttons.  JNC 1.2.2002
	return handled;
}

BOOL LLFloaterIMPanel::handleDragAndDrop(S32 x, S32 y, MASK mask, BOOL drop,
								  EDragAndDropType cargo_type,
								  void* cargo_data,
								  EAcceptance* accept,
								  LLString& tooltip_msg)
{
	BOOL accepted = FALSE;
	switch(cargo_type)
	{
	case DAD_CALLINGCARD:
		accepted = dropCallingCard((LLInventoryItem*)cargo_data, drop);
		break;
	case DAD_CATEGORY:
		accepted = dropCategory((LLInventoryCategory*)cargo_data, drop);
		break;
	default:
		break;
	}
	if (accepted)
	{
		*accept = ACCEPT_YES_MULTI;
	}
	else
	{
		*accept = ACCEPT_NO;
	}
	return TRUE;
} 

BOOL LLFloaterIMPanel::dropCallingCard(LLInventoryItem* item, BOOL drop)
{
	BOOL rv = isAddAllowed();
	if(rv && item && item->getCreatorUUID().notNull())
	{
		if(drop)
		{
			LLDynamicArray<LLUUID> ids;
			ids.put(item->getCreatorUUID());
			addParticipants(ids);
		}
	}
	else
	{
		// set to false if creator uuid is null.
		rv = FALSE;
	}
	return rv;
}

BOOL LLFloaterIMPanel::dropCategory(LLInventoryCategory* category, BOOL drop)
{
	BOOL rv = isAddAllowed();
	if(rv && category)
	{
		LLInventoryModel::cat_array_t cats;
		LLInventoryModel::item_array_t items;
		LLUniqueBuddyCollector buddies;
		gInventory.collectDescendentsIf(category->getUUID(),
										cats,
										items,
										LLInventoryModel::EXCLUDE_TRASH,
										buddies);
		S32 count = items.count();
		if(count == 0)
		{
			rv = FALSE;
		}
		else if(drop)
		{
			LLDynamicArray<LLUUID> ids;
			for(S32 i = 0; i < count; ++i)
			{
				ids.put(items.get(i)->getCreatorUUID());
			}
			addParticipants(ids);
		}
	}
	return rv;
}

BOOL LLFloaterIMPanel::isAddAllowed() const
{

	return ((IM_SESSION_CONFERENCE_START == mDialog) 
			|| (IM_SESSION_ADD) );
}


// static
void LLFloaterIMPanel::onTabClick(void* userdata)
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*) userdata;
	self->setInputFocus(TRUE);
}


// static
void LLFloaterIMPanel::onClickProfile( void* userdata )
{
	//  Bring up the Profile window
	LLFloaterIMPanel* self = (LLFloaterIMPanel*) userdata;
	
	if (self->mOtherParticipantUUID.notNull())
	{
		LLFloaterAvatarInfo::showFromDirectory(self->getOtherParticipantID());
	}
}

// static
void LLFloaterIMPanel::onClickClose( void* userdata )
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*) userdata;
	if(self)
	{
		self->close();
	}
}

void LLFloaterIMPanel::addTeleportButton()
{
	LLButton* btn =
		LLViewerUICtrlFactory::getButtonByName(this, "teleport_btn");

	if ( !btn->getEnabled() )
	{
		//it's required, don't need to check for null here
		// adjust the size of the editor to make room for the button
		LLRect rect = mInputEditor->getRect();
		S32 editor_right = rect.mRight - btn->getRect().getWidth();
		rect.mRight = editor_right;
		mInputEditor->reshape(rect.getWidth(), rect.getHeight(), FALSE);
		mInputEditor->setRect(rect);

		btn->setVisible(TRUE);
		btn->setEnabled(TRUE);
	}
}

// static
void LLFloaterIMPanel::onTeleport(void* userdata)
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*) userdata;
	if(self)
	{
		send_simple_im(self->mSessionUUID, //to
					   "",
					   IM_TELEPORT_911,
					   self->mSessionUUID);//session
	}
}

// static
void LLFloaterIMPanel::onInputEditorFocusReceived( LLUICtrl* caller, void* userdata )
{
	LLFloaterIMPanel* self= (LLFloaterIMPanel*) userdata;
	self->mHistoryEditor->setCursorAndScrollToEnd();
}

// static
void LLFloaterIMPanel::onInputEditorFocusLost(LLUICtrl* caller, void* userdata)
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*) userdata;
	self->setTyping(FALSE);
}

// static
void LLFloaterIMPanel::onInputEditorKeystroke(LLLineEditor* caller, void* userdata)
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*)userdata;
	LLString text = self->mInputEditor->getText();
	if (!text.empty())
	{
		self->setTyping(TRUE);
	}
	else
	{
		// Deleting all text counts as stopping typing.
		self->setTyping(FALSE);
	}
}

void LLFloaterIMPanel::onClose(bool app_quitting)
{
	setTyping(FALSE);

	if(mSessionUUID.notNull())
	{
		std::string name;
		gAgent.buildFullname(name);
		pack_instant_message(
			gMessageSystem,
			gAgent.getID(),
			FALSE,
			gAgent.getSessionID(),
			mOtherParticipantUUID,
			name.c_str(), 
			"",
			IM_ONLINE,
			IM_SESSION_DROP,
			mSessionUUID);
		gAgent.sendReliableMessage();
	}
	gIMView->removeSession(mSessionUUID);

	destroy();
}

void deliver_message(const std::string& utf8_text,
					 const LLUUID& im_session_id,
					 const LLUUID& other_participant_id,
					 EInstantMessage dialog)
{
	std::string name;
	gAgent.buildFullname(name);

	const LLRelationship* info = NULL;
	info = LLAvatarTracker::instance().getBuddyInfo(other_participant_id);
	U8 offline = (!info || info->isOnline()) ? IM_ONLINE : IM_OFFLINE;

	// default to IM_SESSION_SEND unless it's nothing special - in
	// which case it's probably an IM to everyone.
	U8 new_dialog = dialog;

	if ( dialog == IM_SESSION_911_START )
	{
		new_dialog = IM_SESSION_911_SEND;
	}
	else if ( dialog != IM_NOTHING_SPECIAL )
	{
		new_dialog = IM_SESSION_SEND;
	}

	pack_instant_message(
		gMessageSystem,
		gAgent.getID(),
		FALSE,
		gAgent.getSessionID(),
		other_participant_id,
		name.c_str(),
		utf8_text.c_str(),
		offline,
		(EInstantMessage)new_dialog,
		im_session_id);
	gAgent.sendReliableMessage();
}

void LLFloaterIMPanel::sendMsg()
{
	LLWString text = mInputEditor->getWText();
	LLWString::trim(text);
	if (!gAgent.isGodlike() 
		&& (mDialog == IM_NOTHING_SPECIAL)
		&& mOtherParticipantUUID.isNull())
	{
		llinfos << "Cannot send IM to everyone unless you're a god." << llendl;
		return;
	}
	if(text.length() > 0)
	{
		// 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 )
		{
			//we send requests (if we need to) to initialize our session
			if ( !mSessionInitRequested )
			{
				mSessionInitRequested = TRUE;
				if ( !send_start_session_messages(mSessionUUID,
												 mOtherParticipantUUID,
												 mSessionInitialTargetIDs,
												 mDialog) )
				{
					//we don't need to need to wait for any responses
					//so we don't need to disable
					mSessionInitialized = TRUE;
				}
				else
				{
					//queue up the message to send once the session is
					//initialized
					mQueuedMsgsForInit.append(utf8_text);

					//locally echo a little "starting session" message
					LLUIString session_start = sSessionStartString;

					session_start.setArg("[NAME]", getTitle());
					mSessionStartMsgPos = 
						mHistoryEditor->getText().length();

					bool log_to_file = false;
					addHistoryLine(session_start,
								   LLColor4::grey,
								   log_to_file);

				}
			}
			else
			{
				//queue up the message to send once the session is
				//initialized
				mQueuedMsgsForInit.append(utf8_text);
			}
		}

		if ( mSessionInitialized )
		{
			deliver_message(utf8_text,
							mSessionUUID,
							mOtherParticipantUUID,
							mDialog);

			// local echo
			if((mDialog == IM_NOTHING_SPECIAL) && 
			   (mOtherParticipantUUID.notNull()))
			{
				std::string history_echo;
				gAgent.buildFullname(history_echo);

				// Look for IRC-style emotes here.
				char tmpstr[5];		/* Flawfinder: ignore */
				strncpy(tmpstr,
						utf8_text.substr(0,4).c_str(),
						sizeof(tmpstr) -1);		/* Flawfinder: ignore */
				tmpstr[sizeof(tmpstr) -1] = '\0';
				if (!strncmp(tmpstr, "/me ", 4) || 
					!strncmp(tmpstr, "/me'", 4))
				{
					utf8_text.replace(0,3,"");
				}
				else
				{
					history_echo += ": ";
				}
				history_echo += utf8_text;
				addHistoryLine(history_echo);
			}
		}

		gViewerStats->incStat(LLViewerStats::ST_IM_COUNT);
	}
	mInputEditor->setText("");

	// Don't need to actually send the typing stop message, the other
	// client will infer it from receiving the message.
	mTyping = FALSE;
	mSentTypingState = TRUE;
}

void LLFloaterIMPanel::sessionInitReplyReceived(const LLUUID& session_id)
{
	mSessionUUID = session_id;
	mSessionInitialized = TRUE;

	//we assume the history editor hasn't moved at all since
	//we added the starting session message
	//so, we count how many characters to remove
	S32 chars_to_remove = mHistoryEditor->getText().length() - 
		mSessionStartMsgPos;
	mHistoryEditor->removeTextFromEnd(chars_to_remove);

	//and now, send the queued msg
	LLSD::array_iterator iter;
	for ( iter = mQueuedMsgsForInit.beginArray();
		  iter != mQueuedMsgsForInit.endArray();
		  ++iter)
	{
		deliver_message(iter->asString(),
						mSessionUUID,
						mOtherParticipantUUID,
						mDialog);
	}
}


void LLFloaterIMPanel::setTyping(BOOL typing)
{
	if (typing)
	{
		// Every time you type something, reset this timer
		mLastKeystrokeTimer.reset();

		if (!mTyping)
		{
			// You just started typing.
			mFirstKeystrokeTimer.reset();

			// Will send typing state after a short delay.
			mSentTypingState = FALSE;
		}
	}
	else
	{
		if (mTyping)
		{
			// you just stopped typing, send state immediately
			sendTypingState(FALSE);
			mSentTypingState = TRUE;
		}
	}

	mTyping = typing;
}

void LLFloaterIMPanel::sendTypingState(BOOL typing)
{
	// Don't want to send typing indicators to multiple people, potentially too
	// much network traffic.  Only send in person-to-person IMs.
	if (mDialog != IM_NOTHING_SPECIAL) return;

	std::string name;
	gAgent.buildFullname(name);

	pack_instant_message(
		gMessageSystem,
		gAgent.getID(),
		FALSE,
		gAgent.getSessionID(),
		mOtherParticipantUUID,
		name.c_str(),
		"typing",
		IM_ONLINE,
		(typing ? IM_TYPING_START : IM_TYPING_STOP),
		mSessionUUID);
	gAgent.sendReliableMessage();
}


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


void LLFloaterIMPanel::addTypingIndicator(const LLIMInfo* im_info)
{
	mTypingLineStartIndex = mHistoryEditor->getText().length();

	LLUIString typing_start = sTypingStartString;
	typing_start.setArg("[NAME]", im_info->mName);
	bool log_to_file = false;
	addHistoryLine(typing_start, LLColor4::grey, log_to_file);
	mOtherTyping = TRUE;
}


void LLFloaterIMPanel::removeTypingIndicator()
{
	if (mOtherTyping)
	{
		// Must do this first, otherwise addHistoryLine calls us again.
		mOtherTyping = FALSE;

		S32 chars_to_remove = mHistoryEditor->getText().length() - mTypingLineStartIndex;
		mHistoryEditor->removeTextFromEnd(chars_to_remove);
	}
}

//static
void LLFloaterIMPanel::chatFromLogFile(LLString line, void* userdata)
{
	LLFloaterIMPanel* self = (LLFloaterIMPanel*)userdata;
	
	//self->addHistoryLine(line, LLColor4::grey, FALSE);
	self->mHistoryEditor->appendColoredText(line, false, true, LLColor4::grey);

}