/**
 * @file LLFloaterIMNearbyChat.cpp
 * @brief LLFloaterIMNearbyChat class implementation
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * 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 "message.h"

#include "lliconctrl.h"
#include "llappviewer.h"
#include "llchatentry.h"
#include "llfloaterreg.h"
#include "lltrans.h"
#include "llfloaterimcontainer.h"
#include "llfloatersidepanelcontainer.h"
#include "llfocusmgr.h"
#include "lllogchat.h"
#include "llresizebar.h"
#include "llresizehandle.h"
#include "lldraghandle.h"
#include "llmenugl.h"
#include "llviewermenu.h" // for gMenuHolder
#include "llfloaterimnearbychathandler.h"
#include "llchannelmanager.h"
#include "llchathistory.h"
#include "llstylemap.h"
#include "llavatarnamecache.h"
#include "llfloaterreg.h"
#include "lltrans.h"

#include "llfirstuse.h"
#include "llfloaterimnearbychat.h"
#include "llagent.h" // gAgent
#include "llgesturemgr.h"
#include "llmultigesture.h"
#include "llkeyboard.h"
#include "llanimationstates.h"
#include "llviewerstats.h"
#include "llcommandhandler.h"
#include "llviewercontrol.h"
#include "llnavigationbar.h"
#include "llwindow.h"
#include "llviewerwindow.h"
#include "llrootview.h"
#include "llviewerchat.h"
#include "lltranslate.h"
#include "llautoreplace.h"
#include "lluiusage.h"

S32 LLFloaterIMNearbyChat::sLastSpecialChatChannel = 0;

constexpr S32 EXPANDED_HEIGHT = 266;
constexpr S32 COLLAPSED_HEIGHT = 60;
constexpr S32 EXPANDED_MIN_HEIGHT = 150;

// legacy callback glue
void send_chat_from_viewer(const std::string& utf8_out_text, EChatType type, S32 channel);

struct LLChatTypeTrigger {
    std::string name;
    EChatType type;
};

static LLChatTypeTrigger sChatTypeTriggers[] = {
    { "/whisper"    , CHAT_TYPE_WHISPER},
    { "/shout"  , CHAT_TYPE_SHOUT}
};

bool cb_do_nothing()
{
    return false;
}

LLFloaterIMNearbyChat::LLFloaterIMNearbyChat(const LLSD& llsd)
:   LLFloaterIMSessionTab(LLSD(LLUUID::null)),
    //mOutputMonitor(NULL),
    mSpeakerMgr(NULL),
    mExpandedHeight(COLLAPSED_HEIGHT + EXPANDED_HEIGHT)
{
    mIsP2PChat = false;
    mIsNearbyChat = true;
    mSpeakerMgr = LLLocalSpeakerMgr::getInstance();

    // Required by LLFloaterIMSessionTab::mGearBtn
    // But nearby floater has no 'per agent' menu items,
    mEnableCallbackRegistrar.add("Avatar.EnableGearItem", boost::bind(&cb_do_nothing));
    mCommitCallbackRegistrar.add("Avatar.GearDoToSelected", boost::bind(&cb_do_nothing));
    mEnableCallbackRegistrar.add("Avatar.CheckGearItem", boost::bind(&cb_do_nothing));

    mMinFloaterHeight = EXPANDED_MIN_HEIGHT;
}

//static
LLFloaterIMNearbyChat* LLFloaterIMNearbyChat::buildFloater(const LLSD& key)
{
    LLFloaterReg::getInstance("im_container");
    return new LLFloaterIMNearbyChat(key);
}

//virtual
bool LLFloaterIMNearbyChat::postBuild()
{
    setIsSingleInstance(true);
    bool result = LLFloaterIMSessionTab::postBuild();

    mInputEditor->setAutoreplaceCallback(boost::bind(&LLAutoReplace::autoreplaceCallback, LLAutoReplace::getInstance(), _1, _2, _3, _4, _5));
    mInputEditor->setCommitCallback(boost::bind(&LLFloaterIMNearbyChat::onChatBoxCommit, this));
    mInputEditor->setKeystrokeCallback(boost::bind(&LLFloaterIMNearbyChat::onChatBoxKeystroke, this));
    mInputEditor->setFocusLostCallback(boost::bind(&LLFloaterIMNearbyChat::onChatBoxFocusLost, this));
    mInputEditor->setFocusReceivedCallback(boost::bind(&LLFloaterIMNearbyChat::onChatBoxFocusReceived, this));
    std::string nearbyChatTitle(LLTrans::getString("NearbyChatTitle"));
    mInputEditor->setLabel(nearbyChatTitle);

    // Title must be defined BEFORE call to addConversationListItem() because
    // it is used to show the item's name in the conversations list
    setTitle(nearbyChatTitle);

    // obsolete, but may be needed for backward compatibility?
    gSavedSettings.declareS32("nearbychat_showicons_and_names", 2, "NearByChat header settings", LLControlVariable::PERSIST_NONDFT);

    if (gSavedPerAccountSettings.getBOOL("LogShowHistory"))
    {
        loadHistory();
    }

    return result;
}

// virtual
void LLFloaterIMNearbyChat::closeHostedFloater()
{
    // If detached from conversations window close anyway
    if (!getHost())
    {
        setVisible(false);
    }

    // Should check how many conversations are ongoing. Select next to "Nearby Chat" in case there are some other besides.
    // Close conversations window in case "Nearby Chat" is attached and the only conversation
    LLFloaterIMContainer* floater_container = LLFloaterIMContainer::getInstance();
    if (floater_container->getConversationListItemSize() == 1)
    {
        if (getHost())
        {
            floater_container->closeFloater();
        }
    }
    else
    {
        if (!getHost())
        {
            floater_container->selectNextConversationByID(LLUUID());
        }
    }
}

// virtual
void LLFloaterIMNearbyChat::refresh()
{
    displaySpeakingIndicator();
    updateCallBtnState(LLVoiceClient::getInstance()->getUserPTTState());

    // *HACK: Update transparency type depending on whether our children have focus.
    // This is needed because this floater is chrome and thus cannot accept focus, so
    // the transparency type setting code from LLFloater::setFocus() isn't reached.
    if (getTransparencyType() != TT_DEFAULT)
    {
        setTransparencyType(hasFocus() ? TT_ACTIVE : TT_INACTIVE);
    }
}

void LLFloaterIMNearbyChat::reloadMessages(bool clean_messages/* = false*/)
{
    if (clean_messages)
    {
        mMessageArchive.clear();
        loadHistory();
    }

    mChatHistory->clear();

    LLSD do_not_log;
    do_not_log["do_not_log"] = true;
    for(std::vector<LLChat>::iterator it = mMessageArchive.begin();it!=mMessageArchive.end();++it)
    {
        // Update the messages without re-writing them to a log file.
        addMessage(*it,false, do_not_log);
    }
}

void LLFloaterIMNearbyChat::loadHistory()
{
    LLSD do_not_log;
    do_not_log["do_not_log"] = true;

    std::list<LLSD> history;
    LLLogChat::loadChatHistory("chat", history);

    std::list<LLSD>::const_iterator it = history.begin();
    while (it != history.end())
    {
        const LLSD& msg = *it;

        std::string from = msg[LL_IM_FROM];
        LLUUID from_id;
        if (msg[LL_IM_FROM_ID].isDefined())
        {
            from_id = msg[LL_IM_FROM_ID].asUUID();
        }
        else
        {
            std::string legacy_name = gCacheName->buildLegacyName(from);
            from_id = LLAvatarNameCache::getInstance()->findIdByName(legacy_name);
        }

        LLChat chat;
        chat.mFromName = from;
        chat.mFromID = from_id;
        chat.mText = msg[LL_IM_TEXT].asString();
        chat.mTimeStr = msg[LL_IM_TIME].asString();
        chat.mChatStyle = CHAT_STYLE_HISTORY;

        chat.mSourceType = CHAT_SOURCE_AGENT;
        if (from_id.isNull() && SYSTEM_FROM == from)
        {
            chat.mSourceType = CHAT_SOURCE_SYSTEM;

        }
        else if (from_id.isNull())
        {
            chat.mSourceType = isWordsName(from) ? CHAT_SOURCE_UNKNOWN : CHAT_SOURCE_OBJECT;
        }

        addMessage(chat, true, do_not_log);

        it++;
    }
}

void LLFloaterIMNearbyChat::removeScreenChat()
{
    LLNotificationsUI::LLScreenChannelBase* chat_channel = LLNotificationsUI::LLChannelManager::getInstance()->findChannelByID(
        LLNotificationsUI::NEARBY_CHAT_CHANNEL_UUID);
    if(chat_channel)
    {
        chat_channel->removeToastsFromChannel();
    }
}


void LLFloaterIMNearbyChat::setVisible(bool visible)
{
    LLFloaterIMSessionTab::setVisible(visible);

    if(visible)
    {
        removeScreenChat();
    }
}


void LLFloaterIMNearbyChat::setVisibleAndFrontmost(bool take_focus, const LLSD& key)
{
    LLFloaterIMSessionTab::setVisibleAndFrontmost(take_focus, key);

    if(matchesKey(key))
    {
        LLFloaterIMContainer::getInstance()->selectConversationPair(mSessionID, true, take_focus);
    }
}

// virtual
void LLFloaterIMNearbyChat::onTearOffClicked()
{
    LLFloaterIMSessionTab::onTearOffClicked();

    // see CHUI-170: Save torn-off state of the nearby chat between sessions
    bool in_the_multifloater(getHost());
    gSavedPerAccountSettings.setBOOL("NearbyChatIsNotTornOff", in_the_multifloater);
}


// virtual
void LLFloaterIMNearbyChat::onOpen(const LLSD& key)
{
    LLFloaterIMSessionTab::onOpen(key);
    if(!isMessagePaneExpanded())
    {
        restoreFloater();
        onCollapseToLine(this);
    }
}

// virtual
void LLFloaterIMNearbyChat::onClose(bool app_quitting)
{
    // Override LLFloaterIMSessionTab::onClose() so that Nearby Chat is not removed from the conversation floater
    LLFloaterIMSessionTab::restoreFloater();
    if (app_quitting)
    {
        // We are starting and closing floater in "expanded" state
        // Update expanded (restored) rect and position for use in next session
        forceReshape();
        storeRectControl();
    }
}

// virtual
void LLFloaterIMNearbyChat::onClickCloseBtn(bool)

{
    if (!isTornOff())
    {
        return;
    }
    closeHostedFloater();
}

void LLFloaterIMNearbyChat::onChatFontChange(LLFontGL* fontp)
{
    // Update things with the new font whohoo
    if (mInputEditor)
    {
        mInputEditor->setFont(fontp);
    }
}


void LLFloaterIMNearbyChat::show()
{
        openFloater(getKey());
}

bool LLFloaterIMNearbyChat::isChatVisible() const
{
    bool isVisible = false;
    LLFloaterIMContainer* im_box = LLFloaterIMContainer::getInstance();
    // Is the IM floater container ever null?
    llassert(im_box != NULL);
    if (im_box != NULL)
    {
        isVisible =
                isChatMultiTab() && gSavedPerAccountSettings.getBOOL("NearbyChatIsNotTornOff")?
                        im_box->getVisible() && !im_box->isMinimized() :
                        getVisible() && !isMinimized();
    }

    return isVisible;
}

void LLFloaterIMNearbyChat::showHistory()
{
    openFloater();
    LLFloaterIMContainer::getInstance()->selectConversation(LLUUID(NULL));

    if(!isMessagePaneExpanded())
    {
        restoreFloater();
        setFocus(true);
    }
    else
    {
        LLFloaterIMContainer::getInstance()->setFocus(true);
    }
    setResizeLimits(getMinWidth(), EXPANDED_MIN_HEIGHT);
}

std::string LLFloaterIMNearbyChat::getCurrentChat()
{
    return mInputEditor ? mInputEditor->getText() : LLStringUtil::null;
}

// virtual
bool LLFloaterIMNearbyChat::handleKeyHere( KEY key, MASK mask )
{
    bool handled = false;

    if( KEY_RETURN == key && mask == MASK_CONTROL)
    {
        // shout
        sendChat(CHAT_TYPE_SHOUT);
        handled = true;
    }
    else if (KEY_RETURN == key && mask == MASK_SHIFT)
    {
        // whisper
        sendChat(CHAT_TYPE_WHISPER);
        handled = true;
    }


    if((mask == MASK_ALT) && isTornOff())
    {
        LLFloaterIMContainer* floater_container = LLFloaterIMContainer::getInstance();
        if ((KEY_UP == key) || (KEY_LEFT == key))
        {
            floater_container->selectNextorPreviousConversation(false);
            handled = true;
        }
        if ((KEY_DOWN == key ) || (KEY_RIGHT == key))
        {
            floater_container->selectNextorPreviousConversation(true);
            handled = true;
        }
    }

    return handled;
}

bool LLFloaterIMNearbyChat::matchChatTypeTrigger(const std::string& in_str, std::string* out_str)
{
    auto in_len = in_str.length();
    S32 cnt = sizeof(sChatTypeTriggers) / sizeof(*sChatTypeTriggers);

    bool string_was_found = false;

    for (S32 n = 0; n < cnt && !string_was_found; n++)
    {
        if (in_len <= sChatTypeTriggers[n].name.length())
        {
            std::string trigger_trunc = sChatTypeTriggers[n].name;
            LLStringUtil::truncate(trigger_trunc, in_len);

            if (!LLStringUtil::compareInsensitive(in_str, trigger_trunc))
            {
                *out_str = sChatTypeTriggers[n].name;
                string_was_found = true;
            }
        }
    }

    return string_was_found;
}

void LLFloaterIMNearbyChat::onChatBoxKeystroke()
{
    LLFloaterIMContainer* im_box = LLFloaterIMContainer::findInstance();
    if (im_box)
    {
        im_box->flashConversationItemWidget(mSessionID,false);
    }

    LLFirstUse::otherAvatarChatFirst(false);

    LLWString raw_text = mInputEditor->getWText();

    // Can't trim the end, because that will cause autocompletion
    // to eat trailing spaces that might be part of a gesture.
    LLWStringUtil::trimHead(raw_text);

    auto length = raw_text.length();

    if( (length > 0) && (raw_text[0] != '/') )  // forward slash is used for escape (eg. emote) sequences
    {
        gAgent.startTyping();
    }
    else
    {
        gAgent.stopTyping();
    }

    /* Doesn't work -- can't tell the difference between a backspace
       that killed the selection vs. backspace at the end of line.
    if (length > 1
        && text[0] == '/'
        && key == KEY_BACKSPACE)
    {
        // the selection will already be deleted, but we need to trim
        // off the character before
        std::string new_text = raw_text.substr(0, length-1);
        mInputEditor->setText( new_text );
        mInputEditor->setCursorToEnd();
        length = length - 1;
    }
    */

    KEY key = gKeyboard->currentKey();

    // Ignore "special" keys, like backspace, arrows, etc.
    if (gSavedSettings.getBOOL("ChatAutocompleteGestures")
        && length > 1
        && raw_text[0] == '/'
        && key < KEY_SPECIAL)
    {
        // we're starting a gesture, attempt to autocomplete

        std::string utf8_trigger = wstring_to_utf8str(raw_text);
        std::string utf8_out_str(utf8_trigger);

        if (LLGestureMgr::instance().matchPrefix(utf8_trigger, &utf8_out_str))
        {
            std::string rest_of_match = utf8_out_str.substr(utf8_trigger.size());
            if (!rest_of_match.empty())
            {
                mInputEditor->setText(utf8_trigger + rest_of_match); // keep original capitalization for user-entered part
                // Select to end of line, starting from the character
                // after the last one the user typed.
                mInputEditor->selectByCursorPosition(static_cast<S32>(utf8_out_str.size() - rest_of_match.size()), static_cast<S32>(utf8_out_str.size()));
            }

        }
        else if (matchChatTypeTrigger(utf8_trigger, &utf8_out_str))
        {
            std::string rest_of_match = utf8_out_str.substr(utf8_trigger.size());
            mInputEditor->setText(utf8_trigger + rest_of_match + " "); // keep original capitalization for user-entered part
            mInputEditor->endOfDoc();
        }

        //LL_INFOS() << "GESTUREDEBUG " << trigger
        //  << " len " << length
        //  << " outlen " << out_str.getLength()
        //  << LL_ENDL;
    }
}

// static
void LLFloaterIMNearbyChat::onChatBoxFocusLost()
{
    // stop typing animation
    gAgent.stopTyping();
}

void LLFloaterIMNearbyChat::onChatBoxFocusReceived()
{
    mInputEditor->setEnabled(!gDisconnected);
}

EChatType LLFloaterIMNearbyChat::processChatTypeTriggers(EChatType type, std::string &str)
{
    auto length = str.length();
    S32 cnt = sizeof(sChatTypeTriggers) / sizeof(*sChatTypeTriggers);

    for (S32 n = 0; n < cnt; n++)
    {
        if (length >= sChatTypeTriggers[n].name.length())
        {
            std::string trigger = str.substr(0, sChatTypeTriggers[n].name.length());

            if (!LLStringUtil::compareInsensitive(trigger, sChatTypeTriggers[n].name))
            {
                auto trigger_length = sChatTypeTriggers[n].name.length();

                // It's to remove space after trigger name
                if (length > trigger_length && str[trigger_length] == ' ')
                    trigger_length++;

                str = str.substr(trigger_length, length);

                if (CHAT_TYPE_NORMAL == type)
                    return sChatTypeTriggers[n].type;
                else
                    break;
            }
        }
    }

    return type;
}

void LLFloaterIMNearbyChat::sendChat( EChatType type )
{
    if (mInputEditor)
    {
        LLWString text = mInputEditor->getWText();
        LLWStringUtil::trim(text);
        LLWStringUtil::replaceChar(text,182,'\n'); // Convert paragraph symbols back into newlines.
        if (!text.empty())
        {
            // Check if this is destined for another channel
            S32 channel = 0;
            stripChannelNumber(text, &channel);

            updateUsedEmojis(text);

            std::string utf8text = wstring_to_utf8str(text);
            // Try to trigger a gesture, if not chat to a script.
            std::string utf8_revised_text;
            if (0 == channel)
            {
                // discard returned "found" boolean
                if(!LLGestureMgr::instance().triggerAndReviseString(utf8text, &utf8_revised_text))
                {
                    utf8_revised_text = utf8text;
                }
            }
            else
            {
                utf8_revised_text = utf8text;
            }

            utf8_revised_text = utf8str_trim(utf8_revised_text);

            type = processChatTypeTriggers(type, utf8_revised_text);

            if (!utf8_revised_text.empty())
            {
                // Chat with animation
                sendChatFromViewer(utf8_revised_text, type, gSavedSettings.getBOOL("PlayChatAnim"));
            }
        }

        mInputEditor->setText(LLStringExplicit(""));
    }

    gAgent.stopTyping();

    // If the user wants to stop chatting on hitting return, lose focus
    // and go out of chat mode.
    if (gSavedSettings.getBOOL("CloseChatOnReturn"))
    {
        stopChat();
    }
}

void LLFloaterIMNearbyChat::addMessage(const LLChat& chat,bool archive,const LLSD &args)
{
    appendMessage(chat, args);

    if(archive)
    {
        mMessageArchive.push_back(chat);
        if(mMessageArchive.size() > 200)
        {
            mMessageArchive.erase(mMessageArchive.begin());
        }
    }

    // logging
    if (!args["do_not_log"].asBoolean() && gSavedPerAccountSettings.getS32("KeepConversationLogTranscripts") > 1)
    {
        std::string from_name = chat.mFromName;

        if (chat.mSourceType == CHAT_SOURCE_AGENT)
        {
            // if the chat is coming from an agent, log the complete name
            LLAvatarName av_name;
            LLAvatarNameCache::get(chat.mFromID, &av_name);

            if (!av_name.isDisplayNameDefault())
            {
                from_name = av_name.getCompleteName();
            }
        }

        LLLogChat::saveHistory("chat", from_name, chat.mFromID, chat.mText);
    }
}


void LLFloaterIMNearbyChat::onChatBoxCommit()
{
    sendChat(CHAT_TYPE_NORMAL);

    gAgent.stopTyping();
}

void LLFloaterIMNearbyChat::displaySpeakingIndicator()
{
    LLSpeakerMgr::speaker_list_t speaker_list;
    LLUUID id;

    id.setNull();
    mSpeakerMgr->update(false);
    mSpeakerMgr->getSpeakerList(&speaker_list, false);

    for (LLSpeakerMgr::speaker_list_t::iterator i = speaker_list.begin(); i != speaker_list.end(); ++i)
    {
        LLPointer<LLSpeaker> s = *i;
        if (s->mSpeechVolume > 0 || s->mStatus == LLSpeaker::STATUS_SPEAKING)
        {
            id = s->mID;
            break;
        }
    }
}

void LLFloaterIMNearbyChat::sendChatFromViewer(const std::string &utf8text, EChatType type, bool animate)
{
    sendChatFromViewer(utf8str_to_wstring(utf8text), type, animate);
}

void LLFloaterIMNearbyChat::sendChatFromViewer(const LLWString &wtext, EChatType type, bool animate)
{
    // Look for "/20 foo" channel chats.
    S32 channel = 0;
    LLWString out_text = stripChannelNumber(wtext, &channel);
    std::string utf8_out_text = wstring_to_utf8str(out_text);
    std::string utf8_text = wstring_to_utf8str(wtext);

    utf8_text = utf8str_trim(utf8_text);
    if (!utf8_text.empty())
    {
        utf8_text = utf8str_truncate(utf8_text, MAX_STRING - 1);
    }

    // Don't animate for chats people can't hear (chat to scripts)
    if (animate && (channel == 0))
    {
        if (type == CHAT_TYPE_WHISPER)
        {
            LL_DEBUGS() << "You whisper " << utf8_text << LL_ENDL;
            gAgent.sendAnimationRequest(ANIM_AGENT_WHISPER, ANIM_REQUEST_START);
        }
        else if (type == CHAT_TYPE_NORMAL)
        {
            LL_DEBUGS() << "You say " << utf8_text << LL_ENDL;
            gAgent.sendAnimationRequest(ANIM_AGENT_TALK, ANIM_REQUEST_START);
        }
        else if (type == CHAT_TYPE_SHOUT)
        {
            LL_DEBUGS() << "You shout " << utf8_text << LL_ENDL;
            gAgent.sendAnimationRequest(ANIM_AGENT_SHOUT, ANIM_REQUEST_START);
        }
        else
        {
            LL_INFOS() << "send_chat_from_viewer() - invalid volume" << LL_ENDL;
            return;
        }
    }
    else
    {
        if (type != CHAT_TYPE_START && type != CHAT_TYPE_STOP)
        {
            LL_DEBUGS() << "Channel chat: " << utf8_text << LL_ENDL;
        }
    }

    send_chat_from_viewer(utf8_out_text, type, channel);
}

// static
bool LLFloaterIMNearbyChat::isWordsName(const std::string& name)
{
    // checking to see if it's display name plus username in parentheses
    auto open_paren = name.find(" (", 0);
    auto close_paren = name.find(')', 0);

    if (open_paren != std::string::npos &&
        close_paren == name.length()-1)
    {
        return true;
    }
    else
    {
        //checking for a single space
        auto pos = name.find(' ', 0);
        return std::string::npos != pos && name.rfind(' ', name.length()) == pos && 0 != pos && name.length()-1 != pos;
    }
}

// static
void LLFloaterIMNearbyChat::startChat(const char* line)
{
    LLFloaterIMNearbyChat* nearby_chat = LLFloaterReg::getTypedInstance<LLFloaterIMNearbyChat>("nearby_chat");
    if (nearby_chat)
    {
        if(!nearby_chat->isTornOff())
        {
            LLFloaterIMContainer::getInstance()->selectConversation(LLUUID(NULL));
        }
        if(nearby_chat->isMinimized())
        {
            nearby_chat->setMinimized(false);
        }
        nearby_chat->show();
        nearby_chat->setFocus(true);

        if (line)
        {
            std::string line_string(line);
            nearby_chat->mInputEditor->setText(line_string);
        }

        nearby_chat->mInputEditor->endOfDoc();
    }
}

// Exit "chat mode" and do the appropriate focus changes
// static
void LLFloaterIMNearbyChat::stopChat()
{
    LLFloaterIMNearbyChat* nearby_chat = LLFloaterReg::getTypedInstance<LLFloaterIMNearbyChat>("nearby_chat");
    if (nearby_chat)
    {
        nearby_chat->mInputEditor->setFocus(false);
        gAgent.stopTyping();
    }
}

// If input of the form "/20foo" or "/20 foo", returns "foo" and channel 20.
// Otherwise returns input and channel 0.
LLWString LLFloaterIMNearbyChat::stripChannelNumber(const LLWString &mesg, S32* channel)
{
    if (mesg[0] == '/'
        && mesg[1] == '/')
    {
        // This is a "repeat channel send"
        *channel = sLastSpecialChatChannel;
        return mesg.substr(2, mesg.length() - 2);
    }
    else if (mesg[0] == '/'
             && mesg[1]
             && (LLStringOps::isDigit(mesg[1])
                 || (mesg[1] == '-' && mesg[2] && LLStringOps::isDigit(mesg[2]))))
    {
        // This a special "/20" speak on a channel
        S32 pos = 0;

        // Copy the channel number into a string
        LLWString channel_string;
        llwchar c;
        do
        {
            c = mesg[pos+1];
            channel_string.push_back(c);
            pos++;
        }
        while(c && pos < 64 && (LLStringOps::isDigit(c) || (pos==1 && c =='-')));

        // Move the pointer forward to the first non-whitespace char
        // Check isspace before looping, so we can handle "/33foo"
        // as well as "/33 foo"
        while(c && iswspace(c))
        {
            c = mesg[pos+1];
            pos++;
        }

        sLastSpecialChatChannel = strtol(wstring_to_utf8str(channel_string).c_str(), NULL, 10);
        *channel = sLastSpecialChatChannel;
        return mesg.substr(pos, mesg.length() - pos);
    }
    else
    {
        // This is normal chat.
        *channel = 0;
        return mesg;
    }
}

void send_chat_from_viewer(const std::string& utf8_out_text, EChatType type, S32 channel)
{
    LL_DEBUGS("UIUsage") << "Nearby chat, text " << utf8_out_text << " type " << type << " channel " << channel << LL_ENDL;
    if (type != CHAT_TYPE_START && type != CHAT_TYPE_STOP) // prune back some redundant logging
    {
        LLUIUsage::instance().logCommand("Chat.SendNearby"); // pseuo-command
    }

    LLMessageSystem* msg = gMessageSystem;

    if (channel >= 0)
    {
        msg->newMessageFast(_PREHASH_ChatFromViewer);
        msg->nextBlockFast(_PREHASH_AgentData);
        msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID());
        msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
        msg->nextBlockFast(_PREHASH_ChatData);
        msg->addStringFast(_PREHASH_Message, utf8_out_text);
        msg->addU8Fast(_PREHASH_Type, type);
        msg->addS32("Channel", channel);

    }
    else
    {
        // Hack: ChatFromViewer doesn't allow negative channels
        msg->newMessage("ScriptDialogReply");
        msg->nextBlock("AgentData");
        msg->addUUID("AgentID", gAgentID);
        msg->addUUID("SessionID", gAgentSessionID);
        msg->nextBlock("Data");
        msg->addUUID("ObjectID", gAgentID);
        msg->addS32("ChatChannel", channel);
        msg->addS32("ButtonIndex", 0);
        msg->addString("ButtonLabel", utf8_out_text);
    }

    gAgent.sendReliableMessage();
    add(LLStatViewer::CHAT_COUNT, 1);
}

class LLChatCommandHandler : public LLCommandHandler
{
public:
    // not allowed from outside the app
    LLChatCommandHandler() : LLCommandHandler("chat", UNTRUSTED_BLOCK) { }

    // Your code here
    bool handle(const LLSD& tokens,
                const LLSD& query_map,
                const std::string& grid,
                LLMediaCtrl* web)
    {
        bool retval = false;
        // Need at least 2 tokens to have a valid message.
        if (tokens.size() < 2)
        {
            retval = false;
        }
        else
        {
        S32 channel = tokens[0].asInteger();
            // VWR-19499 Restrict function to chat channels greater than 0.
            if ((channel > 0) && (channel < CHAT_CHANNEL_DEBUG))
            {
                retval = true;
        // Send unescaped message, see EXT-6353.
        std::string unescaped_mesg (LLURI::unescape(tokens[1].asString()));
        send_chat_from_viewer(unescaped_mesg, CHAT_TYPE_NORMAL, channel);
            }
            else
            {
                retval = false;
                // Tell us this is an unsupported SLurl.
            }
        }
        return retval;
    }
};

// Creating the object registers with the dispatcher.
LLChatCommandHandler gChatHandler;