/**
 * @file fschathistory.cpp
 * @brief LLTextEditor base class
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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 PublicatarActions::pay(getAvat
 * 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
 * $/LicenseInfo$
 */

// Original file: LLChatHistory.cpp

#include "llviewerprecompiledheaders.h"

#include "fschathistory.h"

#include <boost/signals2.hpp>

#include "llavatarnamecache.h"
#include "llinstantmessage.h"

#include "llimview.h"
#include "llcommandhandler.h"
#include "llpanel.h"
#include "lluictrlfactory.h"
#include "llscrollcontainer.h"
#include "llagent.h"
#include "llagentdata.h"
#include "llavataractions.h"
#include "llavatariconctrl.h"
#include "llcallingcard.h" //for LLAvatarTracker
#include "llgroupactions.h"
#include "llgroupmgr.h"
#include "llspeakers.h" //for LLIMSpeakerMgr
#include "lltrans.h"
#include "llfloaterreg.h"
#include "llfloaterreporter.h"
#include "llfloatersidepanelcontainer.h"
#include "llstylemap.h"
#include "llslurl.h"
#include "lllayoutstack.h"
#include "llnotifications.h"
#include "llnotificationsutil.h"
#include "lltoastnotifypanel.h"
#include "lltooltip.h"
#include "llviewerregion.h"
#include "llviewertexteditor.h"
#include "llworld.h"
#include "lluiconstants.h"
#include "llstring.h"
#include "llurlaction.h"
#include "llviewercontrol.h"
#include "llviewermenu.h"
#include "llviewernetwork.h"

#if LL_SDL2
#include "llwindow.h"
#endif

#include "fscommon.h"
#include "llchatentry.h"
#include "llfocusmgr.h"
#include "llkeyboard.h"
#include "llpanelblockedlist.h"
#include "rlvactions.h"
#include "rlvcommon.h"
#include "rlvhandler.h"

static LLDefaultChildRegistry::Register<FSChatHistory> r("fs_chat_history");

const static std::string NEW_LINE(rawstr_to_utf8("\n"));

const static std::string SLURL_APP_AGENT = "secondlife:///app/agent/";
const static std::string SLURL_ABOUT = "/about";

// support for secondlife:///app/objectim/{UUID}/ SLapps
class LLObjectIMHandler : public LLCommandHandler
{
public:
    // requests will be throttled from a non-trusted browser
    LLObjectIMHandler() : LLCommandHandler("objectim", UNTRUSTED_THROTTLE) {}

    bool handle(const LLSD& params, const LLSD& query_map, const std::string& grid, LLMediaCtrl* web)
    {
        if (params.size() < 1)
        {
            return false;
        }

        LLUUID object_id;
        if (!object_id.set(params[0], false))
        {
            return false;
        }

        LLSD payload;
        payload["object_id"] = object_id;
        payload["owner_id"] = query_map["owner"];
// [RLVa:KB] - Checked: 2010-11-02 (RLVa-1.2.2a) | Modified: RLVa-1.2.2a
        if (query_map.has("rlv_shownames"))
            payload["rlv_shownames"] = query_map["rlv_shownames"];
// [/RLVa:KB]
        payload["name"] = query_map["name"];
        payload["slurl"] = LLWeb::escapeURL(query_map["slurl"]);
        payload["group_owned"] = query_map["groupowned"];
        LLFloaterReg::showInstance("inspect_remote_object", payload);
        return true;
    }
};
LLObjectIMHandler gObjectIMHandler;

class FSChatHistoryHeader: public LLPanel
{
public:
    FSChatHistoryHeader()
    :   LLPanel(),
        mInfoCtrl(NULL),
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
        mShowContextMenu(true),
        mShowInfoCtrl(true),
// [/RLVa:KB]
        mPopupMenuHandleAvatar(),
        mPopupMenuHandleObject(),
        mAvatarID(),
        mSourceType(CHAT_SOURCE_UNKNOWN),
        mType(CHAT_TYPE_NORMAL), // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
        mFrom(),
        mSessionID(),
        mCreationTime(time_corrected()),
        mMinUserNameWidth(0),
        mUserNameFont(NULL),
        mUserNameTextBox(NULL),
        mNeedsTimeBox(true),
        mTimeBoxTextBox(NULL),
        mHeaderLayoutStack(NULL),
        mAvatarNameCacheConnection(),
        mTime(0)
    {}

    static FSChatHistoryHeader* createInstance(const std::string& file_name)
    {
        FSChatHistoryHeader* pInstance = new FSChatHistoryHeader;
        pInstance->buildFromFile(file_name);
        return pInstance;
    }

    ~FSChatHistoryHeader()
    {
        if (mAvatarNameCacheConnection.connected())
        {
            mAvatarNameCacheConnection.disconnect();
        }
        auto menu = mPopupMenuHandleAvatar.get();
        if (menu)
        {
            menu->die();
            mPopupMenuHandleAvatar.markDead();
        }
        menu = mPopupMenuHandleObject.get();
        if (menu)
        {
            menu->die();
            mPopupMenuHandleObject.markDead();
        }
    }

    bool handleMouseUp(S32 x, S32 y, MASK mask)
    {
        return LLPanel::handleMouseUp(x,y,mask);
    }

    void onObjectIconContextMenuItemClicked(const LLSD& userdata)
    {
        std::string level = userdata.asString();

        if (level == "profile")
        {
            LLFloaterReg::showInstance("inspect_remote_object", mObjectData);
        }
        else if (level == "block")
        {
            LLMuteList::getInstance()->add(LLMute(getAvatarId(), mFrom, LLMute::OBJECT));
            LLPanelBlockedList::showPanelAndSelect(getAvatarId());
        }
        else if (level == "unblock")
        {
            LLMuteList::getInstance()->remove(LLMute(getAvatarId(), mFrom, LLMute::OBJECT));
        }
        else if (level == "map")
        {
            std::string url = "secondlife://" + mObjectData["slurl"].asString();
            LLUrlAction::showLocationOnMap(url);
        }
        else if (level == "teleport")
        {
            std::string url = "secondlife://" + mObjectData["slurl"].asString();
            LLUrlAction::teleportToLocation(url);
        }
        else if (level == "obj_zoom_in")
        {
            LLUUID obj_id = mObjectData["object_id"];
            if (obj_id.notNull())
            {
                handle_zoom_to_object(obj_id);
            }
        }
    }

    bool onObjectIconContextMenuItemVisible(const LLSD& userdata)
    {
        std::string level = userdata.asString();
        if (level == "is_blocked")
        {
            return LLMuteList::getInstance()->isMuted(getAvatarId(), mFrom, LLMute::flagTextChat);
        }
        else if (level == "not_blocked")
        {
            return !LLMuteList::getInstance()->isMuted(getAvatarId(), mFrom, LLMute::flagTextChat);
        }
        else if (level == "obj_zoom_in")
        {
            LLUUID obj_id = mObjectData["object_id"];
            if (obj_id.notNull())
            {
                return nullptr != gObjectList.findObject(mAvatarID);
            }
            return false;
        }
        return false;
    }

    void banGroupMember(const LLUUID& participant_uuid)
    {
        LLUUID group_uuid = mSessionID;
        LLGroupMgrGroupData* gdatap = LLGroupMgr::getInstance()->getGroupData(group_uuid);
        if (!gdatap)
        {
            // Not a group
            return;
        }

        gdatap->banMemberById(participant_uuid);
    }

    bool canBanInGroup()
    {
        LLUUID group_uuid = mSessionID;
        LLGroupMgrGroupData* gdatap = LLGroupMgr::getInstance()->getGroupData(group_uuid);
        if (!gdatap)
        {
            // Not a group
            return false;
        }

        if (gAgent.hasPowerInGroup(group_uuid, GP_ROLE_REMOVE_MEMBER)
            && gAgent.hasPowerInGroup(group_uuid, GP_GROUP_BAN_ACCESS))
        {
            return true;
        }

        return false;
    }

    bool canBanGroupMember(const LLUUID& participant_uuid)
    {
        LLUUID group_uuid = mSessionID;
        LLGroupMgrGroupData* gdatap = LLGroupMgr::getInstance()->getGroupData(group_uuid);
        if (!gdatap)
        {
            // Not a group
            return false;
        }

        if (gdatap->mPendingBanRequest)
        {
            return false;
        }

        if (gAgentID == getAvatarId())
        {
            //Don't ban self
            return false;
        }

        if (gdatap->isRoleMemberDataComplete())
        {
            if (gdatap->mMembers.size())
            {
                LLGroupMgrGroupData::member_list_t::iterator mi = gdatap->mMembers.find(participant_uuid);
                if (mi != gdatap->mMembers.end())
                {
                    LLGroupMemberData* member_data = (*mi).second;
                    // Is the member an owner?
                    if (member_data && member_data->isInRole(gdatap->mOwnerRole))
                    {
                        return false;
                    }

                    if (gAgent.hasPowerInGroup(group_uuid, GP_ROLE_REMOVE_MEMBER)
                        && gAgent.hasPowerInGroup(group_uuid, GP_GROUP_BAN_ACCESS))
                    {
                        return true;
                    }
                }
            }
        }

        LLSpeakerMgr * speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
        if (speaker_mgr)
        {
            LLSpeaker * speakerp = speaker_mgr->findSpeaker(participant_uuid).get();

            if (speakerp
                && gAgent.hasPowerInGroup(group_uuid, GP_ROLE_REMOVE_MEMBER)
                && gAgent.hasPowerInGroup(group_uuid, GP_GROUP_BAN_ACCESS))
            {
                return true;
            }
        }

        return false;
    }

    bool isGroupModerator()
    {
        LLSpeakerMgr * speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
        if (!speaker_mgr)
        {
            LL_WARNS() << "Speaker manager is missing" << LL_ENDL;
            return false;
        }

        // Is session a group call/chat?
        if(gAgent.isInGroup(mSessionID))
        {
            LLSpeaker * speakerp = speaker_mgr->findSpeaker(gAgentID).get();

            // Is agent a moderator?
            return speakerp && speakerp->mIsModerator;
        }

        return false;
    }

    bool canModerate(const std::string& userdata)
    {
        // only group moderators can perform actions related to this "enable callback"
        if (!isGroupModerator() || gAgentID == getAvatarId())
        {
            return false;
        }

        LLSpeakerMgr * speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
        if (!speaker_mgr)
        {
            return false;
        }

        LLSpeaker * speakerp = speaker_mgr->findSpeaker(getAvatarId()).get();
        if (!speakerp)
        {
            return false;
        }

        bool voice_channel = speakerp->isInVoiceChannel();

        if ("can_moderate_voice" == userdata)
        {
            return voice_channel;
        }
        else if ("can_mute" == userdata)
        {
            return voice_channel && (speakerp->mStatus != LLSpeaker::STATUS_MUTED);
        }
        else if ("can_unmute" == userdata)
        {
            return speakerp->mStatus == LLSpeaker::STATUS_MUTED;
        }
        else if ("can_allow_text_chat" == userdata)
        {
            return true;
        }

        return false;
    }

    void onAvatarIconContextMenuItemClicked(const LLSD& userdata)
    {
        std::string param = userdata.asString();

        if (param == "profile")
        {
            LLAvatarActions::showProfile(getAvatarId());
        }
        else if (param == "im")
        {
            LLAvatarActions::startIM(getAvatarId());
        }
        else if (param == "teleport_to")
        {
            LLAvatarActions::teleportTo(getAvatarId());
        }
        else if (param == "teleport")
        {
            LLAvatarActions::offerTeleport(getAvatarId());
        }
        else if (param == "request_teleport")
        {
            LLAvatarActions::teleportRequest(getAvatarId());
        }
        else if (param == "voice_call")
        {
            LLAvatarActions::startCall(getAvatarId());
        }
        else if (param == "chat_history")
        {
            LLAvatarActions::viewChatHistory(getAvatarId());
        }
        else if (param == "add")
        {
            LLAvatarActions::requestFriendshipDialog(getAvatarId(), mFrom);
        }
        else if (param == "add_set")
        {
            LLAvatarActions::addToContactSet(getAvatarId());
        }
        else if (param == "remove")
        {
            LLAvatarActions::removeFriendDialog(getAvatarId());
        }
        else if (param == "invite_to_group")
        {
            LLAvatarActions::inviteToGroup(getAvatarId());
        }
        else if (param == "zoom_in")
        {
            handle_zoom_to_object(getAvatarId());
        }
        else if (param == "map")
        {
            LLAvatarActions::showOnMap(getAvatarId());
        }
        else if (param == "track")
        {
            LLAvatarActions::track(getAvatarId());
        }
        else if (param == "share")
        {
            LLAvatarActions::share(getAvatarId());
        }
        else if (param == "pay")
        {
            LLAvatarActions::pay(getAvatarId());
        }
        else if (param == "copy_name")
        {
            LLUrlAction::copyLabelToClipboard(LLSLURL("agent", getAvatarId(), "inspect").getSLURLString());
        }
        else if (param == "copy_url")
        {
            LLUrlAction::copyURLToClipboard(LLSLURL("agent", getAvatarId(), "about").getSLURLString());
        }
        else if (param == "report_abuse")
        {
            std::string time_string;
            if (mTime > 0) // have frame time
            {
                time_t current_time = time_corrected();
                time_t message_time = (time_t)(current_time - LLFrameTimer::getElapsedSeconds() + mTime);

                time_string = "[" + LLTrans::getString("TimeMonth") + "]/["
                    + LLTrans::getString("TimeDay") + "]/["
                    + LLTrans::getString("TimeYear") + "] ["
                    + LLTrans::getString("TimeHour") + "]:["
                    + LLTrans::getString("TimeMin") + "]";

                LLSD substitution;

                substitution["datetime"] = (S32)message_time;
                LLStringUtil::format(time_string, substitution);
            }
            else
            {
                // From history. This might be empty or not full.
                // See LLChatLogParser::parse
                time_string = getChild<LLTextBox>("time_box")->getValue().asString();

                // Just add current date if not full.
                // Should be fine since both times are supposed to be stl
                if (!time_string.empty() && time_string.size() < 7)
                {
                    time_string = "[" + LLTrans::getString("TimeMonth") + "]/["
                        + LLTrans::getString("TimeDay") + "]/["
                        + LLTrans::getString("TimeYear") + "] " + time_string;

                    LLSD substitution;
                    // To avoid adding today's date to yesterday's timestamp,
                    // use creation time instead of current time
                    substitution["datetime"] = (S32)mCreationTime;
                    LLStringUtil::format(time_string, substitution);
                }
            }
            LLFloaterReporter::showFromChat(mAvatarID, mFrom, time_string, mText);
        }
        else if (param == "block_unblock")
        {
            LLAvatarActions::toggleMute(getAvatarId(), LLMute::flagVoiceChat);
        }
        else if (param == "mute_unmute")
        {
            LLAvatarActions::toggleMute(getAvatarId(), LLMute::flagTextChat);
        }
        else if (param == "allow_text_chat")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            speaker_mgr->allowTextChat(getAvatarId(), true);
        }
        else if (param == "forbid_text_chat")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            speaker_mgr->allowTextChat(getAvatarId(), false);
        }
        else if (param == "group_mute")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                speaker_mgr->moderateVoiceParticipant(getAvatarId(), false);
            }
        }
        else if (param == "group_unmute")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                speaker_mgr->moderateVoiceParticipant(getAvatarId(), true);
            }
        }
        else if (param == "ban_member")
        {
            // <FS:Zi> don't do safety checks as participant list is broken, just ban
            // banGroupMember(getAvatarId());
            std::vector<LLUUID> ids;
            ids.push_back(getAvatarId());

            LLGroupMgr::getInstance()->sendGroupBanRequest(LLGroupMgr::REQUEST_POST, mSessionID, LLGroupMgr::BAN_CREATE, ids);
            LLGroupMgr::getInstance()->sendGroupMemberEjects(mSessionID, ids);
            LLGroupMgr::getInstance()->sendGroupMembersRequest(mSessionID);
            // </FS:Zi>
        }
    }

    bool onAvatarIconContextMenuItemChecked(const LLSD& userdata)
    {
        std::string param = userdata.asString();

        if (param == "is_blocked")
        {
            return LLMuteList::getInstance()->isMuted(getAvatarId(), LLMute::flagVoiceChat);
        }
        if (param == "is_muted")
        {
            return LLMuteList::getInstance()->isMuted(getAvatarId(), LLMute::flagTextChat);
        }
        else if (param == "is_allowed_text_chat")
        {
            if (gAgent.isInGroup(mSessionID))
            {
                LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
                const LLSpeaker * speakerp = speaker_mgr->findSpeaker(getAvatarId());

                if (NULL != speakerp)
                {
                    return !speakerp->mModeratorMutedText;
                }
            }
            return false;
        }
        return false;
    }

    bool onAvatarIconContextMenuItemEnabled(const LLSD& userdata)
    {
        std::string param = userdata.asString();

        if (param == "can_allow_text_chat" || param == "can_mute" || param == "can_unmute")
        {
            return canModerate(userdata);
        }
        else if (param == "report_abuse")
        {
            return gAgentID != mAvatarID;
        }
        // [RLVa:KB] - @pay
        else if (param == "can_pay")
        {
            return RlvActions::canPayAvatar(getAvatarId());
        }
// [/RLVa:KB]
        else if (param == "can_ban_member")
        {
            return canBanGroupMember(getAvatarId());
        }
        return false;
    }

    bool onAvatarIconContextMenuItemVisible(const LLSD& userdata)
    {
        std::string param = userdata.asString();

        if (param == "show_mute")
        {
            LLSpeakerMgr * speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                LLSpeaker * speakerp = speaker_mgr->findSpeaker(getAvatarId()).get();
                if (speakerp)
                {
                    return speakerp->isInVoiceChannel() && speakerp->mStatus != LLSpeaker::STATUS_MUTED;
                }
            }
            return false;
        }
        else if (param == "show_unmute")
        {
            LLSpeakerMgr * speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                LLSpeaker * speakerp = speaker_mgr->findSpeaker(getAvatarId()).get();
                if (speakerp)
                {
                    return speakerp->mStatus == LLSpeaker::STATUS_MUTED;
                }
            }
            return false;
        }
        return false;
    }

    bool postBuild()
    {
        setDoubleClickCallback(boost::bind(&FSChatHistoryHeader::showInspector, this));

        setMouseEnterCallback(boost::bind(&FSChatHistoryHeader::showInfoCtrl, this));
        setMouseLeaveCallback(boost::bind(&FSChatHistoryHeader::hideInfoCtrl, this));

        mUserNameTextBox = getChild<LLTextBox>("user_name");
        mTimeBoxTextBox = getChild<LLTextBox>("time_box");
        mHeaderLayoutStack = getChild<LLLayoutStack>("header_ls");

        mInfoCtrl = LLUICtrlFactory::getInstance()->createFromFile<LLUICtrl>("inspector_info_ctrl.xml", this, LLPanel::child_registry_t::instance());
        if (mInfoCtrl)
        {
            mInfoCtrl->setCommitCallback(boost::bind(&FSChatHistoryHeader::onClickInfoCtrl, mInfoCtrl));
            mInfoCtrl->setVisible(false);
        }
        else
        {
            LL_ERRS() << "Failed to create an interface element due to missing or corrupted file inspector_info_ctrl.xml" << LL_ENDL;
        }

        return LLPanel::postBuild();
    }

    bool pointInChild(const std::string& name,S32 x,S32 y)
    {
        LLUICtrl* child = findChild<LLUICtrl>(name);
        if(!child)
            return false;

        LLView* parent = child->getParent();
        if(parent!=this)
        {
            x-=parent->getRect().mLeft;
            y-=parent->getRect().mBottom;
        }

        S32 local_x = x - child->getRect().mLeft ;
        S32 local_y = y - child->getRect().mBottom ;
        return  child->pointInView(local_x, local_y);
    }

    bool handleRightMouseDown(S32 x, S32 y, MASK mask)
    {
        if(pointInChild("avatar_icon",x,y) || pointInChild("user_name",x,y))
        {
            showContextMenu(x,y);
            return true;
        }

        return LLPanel::handleRightMouseDown(x,y,mask);
    }

    void showInspector()
    {
//      if (mAvatarID.isNull() && CHAT_SOURCE_SYSTEM != mSourceType && CHAT_SOURCE_REGION != mSourceType) return;
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
        // Don't double-click show the inspector if we're not showing the info control
        if ( (!mShowInfoCtrl) || (mAvatarID.isNull() && CHAT_SOURCE_SYSTEM != mSourceType && CHAT_SOURCE_REGION != mSourceType) ) return;
// [/RLVa:KB]

        if (mSourceType == CHAT_SOURCE_OBJECT)
        {
            LLFloaterReg::showInstance("inspect_remote_object", mObjectData);
        }
        else if (mSourceType == CHAT_SOURCE_AGENT || (mSourceType == CHAT_SOURCE_SYSTEM && mType == CHAT_TYPE_RADAR)) // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
        {
            LLUrlAction::executeSLURL(LLSLURL("agent", mAvatarID, "inspect").getSLURLString());
        }
        //if chat source is system, you may add "else" here to define behaviour.
    }

    static void onClickInfoCtrl(LLUICtrl* info_ctrl)
    {
        if (!info_ctrl) return;

        FSChatHistoryHeader* header = dynamic_cast<FSChatHistoryHeader*>(info_ctrl->getParent());
        if (!header) return;

        header->showInspector();
    }

    const LLUUID& getAvatarId () const { return mAvatarID;}

    void setup(const LLChat& chat, const LLStyle::Params& style_params, const LLSD& args)
    {
        mAvatarID = chat.mFromID;
        mSessionID = chat.mSessionID;
        mSourceType = chat.mSourceType;
        mType = chat.mChatType; // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
        mNameStyleParams = style_params;

        // To be able to report a message, we need a copy of it's text
        // and it's easier to store text directly than trying to get
        // it from a lltextsegment or chat's mEditor
        mText = chat.mText;
        mTime = chat.mTime;

        //*TODO overly defensive thing, source type should be maintained out there
        if((chat.mFromID.isNull() && chat.mFromName.empty()) || (chat.mFromName == SYSTEM_FROM && chat.mFromID.isNull()))
        {
            mSourceType = CHAT_SOURCE_SYSTEM;
        }

        // Use the original font defined in panel_chat_header.xml
        mNameStyleParams.font.name = "SansSerifSmall";

        // To be able to use the group chat moderator options, we use the
        // original font style "BOLD" for everything except group chats.
        // Group chats have the option to show moderators in bold, so
        // we display both display and username in "NORMAL" for now.
        static LLCachedControl<bool> fsHighlightGroupMods(gSavedSettings, "FSHighlightGroupMods");
        LLIMModel::LLIMSession* session = LLIMModel::instance().findIMSession(mSessionID);
        if (!fsHighlightGroupMods || !session || !session->isGroupSessionType())
        {
            mNameStyleParams.font.style = "BOLD";
        }

        mUserNameFont = mNameStyleParams.font();
        if (!mUserNameTextBox)
        {
            mUserNameTextBox = getChild<LLTextBox>("user_name");
            mTimeBoxTextBox = getChild<LLTextBox>("time_box");
        }
        mUserNameTextBox->setReadOnlyColor(mNameStyleParams.readonly_color());
        mUserNameTextBox->setColor(mNameStyleParams.color());
        mUserNameTextBox->setFont(mUserNameFont);

        // Make sure we use the correct font style for everything after the display name
        mNameStyleParams.font.style = style_params.font.style;

        if (mSourceType == CHAT_SOURCE_TELEPORT
            && chat.mChatStyle == CHAT_STYLE_TELEPORT_SEP)
        {
            mFrom = chat.mFromName;
            mNeedsTimeBox = false;
            mUserNameTextBox->setValue(mFrom);
            updateMinUserNameWidth();
            LLUIColor sep_color = LLUIColorTable::instance().getColor("ChatTeleportSeparatorColor");
            setTransparentColor(sep_color);
            mTimeBoxTextBox->setVisible(false);
        }
        else  if (chat.mFromName.empty()
            //|| mSourceType == CHAT_SOURCE_SYSTEM
            // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
            || (mSourceType == CHAT_SOURCE_SYSTEM && mType != CHAT_TYPE_RADAR)
            || mAvatarID.isNull())
        {
            if (mSourceType == CHAT_SOURCE_UNKNOWN)
            {
                // Avatar names may come up as CHAT_SOURCE_UNKNOWN - don't append the grid name in that case
                mFrom = chat.mFromName;
            }
            else
            {
                mFrom = LLTrans::getString("SECOND_LIFE"); // Will automatically be substituted!
                if (!chat.mFromName.empty() && (mFrom != chat.mFromName))
                {
                    mFrom += " (" + chat.mFromName + ")";
                }
            }
            mUserNameTextBox->setValue(mFrom);
            updateMinUserNameWidth();
        }
        else if ((mSourceType == CHAT_SOURCE_AGENT || (mSourceType == CHAT_SOURCE_SYSTEM && mType == CHAT_TYPE_RADAR))
                 && !mAvatarID.isNull()
                 && chat.mChatStyle != CHAT_STYLE_SERVER_HISTORY
                 && chat.mChatStyle != CHAT_STYLE_HISTORY)
        {
            // ...from a normal user, lookup the name and fill in later.
            // *NOTE: Do not do this for chat history logs, otherwise the viewer
            // will flood the People API with lookup requests on startup

            // Start with blank so sample data from XUI XML doesn't
            // flash on the screen
//          user_name->setValue( LLSD() );
//          fetchAvatarName();
// [RLVa:KB] - Checked: 2010-11-01 (RLVa-1.2.2a) | Added: RLVa-1.2.2a
            if (!chat.mRlvNamesFiltered)
            {
                mUserNameTextBox->setValue( LLSD() );
                fetchAvatarName();
            }
            else
            {
                // If the agent's chat was subject to @shownames=n we should display their anonimized name
                mFrom = chat.mFromName;
                mUserNameTextBox->setValue(mFrom);
                mUserNameTextBox->setToolTip(mFrom);
                setToolTip(mFrom);
                updateMinUserNameWidth();
            }
// [/RLVa:KB]
        }
        else if (chat.mChatStyle == CHAT_STYLE_HISTORY ||
                 chat.mChatStyle == CHAT_STYLE_SERVER_HISTORY ||
                 (mSourceType == CHAT_SOURCE_AGENT || (mSourceType == CHAT_SOURCE_SYSTEM && mType == CHAT_TYPE_RADAR)))
        {
            //if it's an avatar name with a username add formatting
            auto username_start = chat.mFromName.rfind(" (");
            auto username_end = chat.mFromName.rfind(')');

            if (username_start != std::string::npos &&
                username_end == (chat.mFromName.length() - 1))
            {
                mFrom = chat.mFromName.substr(0, username_start);
                mUserNameTextBox->setValue(mFrom);
            }
            else
            {
                // If the agent's chat was subject to @shownames=n we should display their anonimized name
                mFrom = chat.mFromName;
                mUserNameTextBox->setValue(mFrom);
                updateMinUserNameWidth();
            }
        }
        else
        {
            // ...from an object, just use name as given
            mFrom = chat.mFromName;
            mUserNameTextBox->setValue(mFrom);
            updateMinUserNameWidth();
        }


        setTimeField(chat);

        // Set up the icon.
        LLAvatarIconCtrl* icon = getChild<LLAvatarIconCtrl>("avatar_icon");

        if(mSourceType != CHAT_SOURCE_AGENT ||  mAvatarID.isNull())
            icon->setDrawTooltip(false);

// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
        // Don't show the context menu, info control or avatar icon tooltip if this chat was subject to @shownames=n
        if ( (chat.mRlvNamesFiltered) && ((mSourceType == CHAT_SOURCE_AGENT || (mSourceType == CHAT_SOURCE_SYSTEM && mType == CHAT_TYPE_RADAR)) || (CHAT_SOURCE_OBJECT == mSourceType))  )
        {
            mShowInfoCtrl = mShowContextMenu = false;
            icon->setDrawTooltip(false);
        }
// [/RLVa:KB]

        switch (mSourceType)
        {
            case CHAT_SOURCE_AGENT:
                if (!chat.mRlvNamesFiltered)
                {
                    icon->setValue(chat.mFromID);
                }
                else
                {
                    icon->setValue(LLSD("Unknown_Icon"));
                }
                break;
            case CHAT_SOURCE_OBJECT:
                icon->setValue(LLSD("OBJECT_Icon"));
                break;
            case CHAT_SOURCE_SYSTEM:
            case CHAT_SOURCE_REGION:
                //icon->setValue(LLSD("SL_Logo"));
                // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
                if(chat.mChatType == CHAT_TYPE_RADAR)
                {
                    if (!chat.mRlvNamesFiltered)
                    {
                        icon->setValue(chat.mFromID);
                    }
                    else
                    {
                        icon->setValue(LLSD("Unknown_Icon"));
                    }
                }
                else
                {
                    icon->setValue(LLSD("SL_Logo"));
                }
                // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
                break;
            case CHAT_SOURCE_TELEPORT:
                icon->setValue(LLSD("Command_Destinations_Icon"));
                break;
            case CHAT_SOURCE_UNKNOWN:
                icon->setValue(LLSD("Unknown_Icon"));
                break;
        }

        // In case the message came from an object, save the object info
        // to be able properly show its profile.
        if ( chat.mSourceType == CHAT_SOURCE_OBJECT)
        {
            std::string slurl = args["slurl"].asString();
            if (slurl.empty())
            {
                LLViewerRegion *region = LLWorld::getInstance()->getRegionFromPosAgent(chat.mPosAgent);
                if(region)
                {
                    LLSLURL region_slurl(region->getName(), chat.mPosAgent);
                    slurl = region_slurl.getLocationString();
                }
            }

            LLSD payload;
            payload["object_id"]    = chat.mFromID;
            payload["name"]         = chat.mFromName;
            payload["owner_id"]     = chat.mOwnerID;
            payload["slurl"]        = LLWeb::escapeURL(slurl);

            mObjectData = payload;
        }
    }

    /*virtual*/ void draw()
    {
        LLRect user_name_rect = mUserNameTextBox->getRect();
        S32 user_name_width = user_name_rect.getWidth();
        S32 time_box_width = mTimeBoxTextBox->getRect().getWidth();

        if (mNeedsTimeBox && !mTimeBoxTextBox->getVisible() && user_name_width > mMinUserNameWidth)
        {
            user_name_rect.mRight -= time_box_width;
            mUserNameTextBox->reshape(user_name_rect.getWidth(), user_name_rect.getHeight());
            mUserNameTextBox->setRect(user_name_rect);

            mTimeBoxTextBox->setVisible(true);
        }

        LLPanel::draw();
    }

    void updateMinUserNameWidth()
    {
        if (mUserNameFont)
        {
            const LLWString& text = mUserNameTextBox->getWText();
            mMinUserNameWidth = mUserNameFont->getWidth(text.c_str()) + PADDING;
        }
    }

protected:
    static const S32 PADDING = 20;

    void showContextMenu(S32 x,S32 y)
    {
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
        if (!mShowContextMenu)
            return;
// [/RLVa:KB]
        if(mSourceType == CHAT_SOURCE_SYSTEM)
            //showSystemContextMenu(x,y);
        // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
        {
            // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
            if(mType == CHAT_TYPE_RADAR)
            {
                showAvatarContextMenu(x,y);
            }
            else
            {
                showSystemContextMenu(x,y);
            }
        }
        // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
        if(mAvatarID.notNull() && mSourceType == CHAT_SOURCE_AGENT)
            showAvatarContextMenu(x,y);
        if(mAvatarID.notNull() && mSourceType == CHAT_SOURCE_OBJECT)
            showObjectContextMenu(x,y);
    }

    void showSystemContextMenu(S32 x,S32 y)
    {
    }

    void showObjectContextMenu(S32 x,S32 y)
    {
        LLMenuGL* menu = (LLMenuGL*)mPopupMenuHandleObject.get();
        if (!menu)
        {
            LLUICtrl::CommitCallbackRegistry::ScopedRegistrar registrar;
            LLUICtrl::EnableCallbackRegistry::ScopedRegistrar registrar_enable;

            registrar.add("ObjectIcon.Action", boost::bind(&FSChatHistoryHeader::onObjectIconContextMenuItemClicked, this, _2));
            registrar_enable.add("ObjectIcon.Visible", boost::bind(&FSChatHistoryHeader::onObjectIconContextMenuItemVisible, this, _2));

            menu = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_object_icon.xml", gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
            if (menu)
            {
                mPopupMenuHandleObject = menu->getHandle();
                menu->updateParent(LLMenuGL::sMenuContainer);
                LLMenuGL::showPopup(this, menu, x, y);
            }
            else
            {
                LL_WARNS() << " Failed to create menu_object_icon.xml" << LL_ENDL;
            }
        }
        else
        {
            LLMenuGL::showPopup(this, menu, x, y);
        }
    }

    void showAvatarContextMenu(S32 x,S32 y)
    {
        LLMenuGL* menu = (LLMenuGL*)mPopupMenuHandleAvatar.get();

        if (!menu)
        {
            LLUICtrl::CommitCallbackRegistry::ScopedRegistrar registrar;
            LLUICtrl::EnableCallbackRegistry::ScopedRegistrar registrar_enable;

            registrar.add("AvatarIcon.Action", boost::bind(&FSChatHistoryHeader::onAvatarIconContextMenuItemClicked, this, _2));
            registrar_enable.add("AvatarIcon.Check", boost::bind(&FSChatHistoryHeader::onAvatarIconContextMenuItemChecked, this, _2));
            registrar_enable.add("AvatarIcon.Enable", boost::bind(&FSChatHistoryHeader::onAvatarIconContextMenuItemEnabled, this, _2));
            registrar_enable.add("AvatarIcon.Visible", boost::bind(&FSChatHistoryHeader::onAvatarIconContextMenuItemVisible, this, _2));

            menu = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_avatar_icon.xml", gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
            if (menu)
            {
                mPopupMenuHandleAvatar = menu->getHandle();
            }
            else
            {
                LL_WARNS() << " Failed to create menu_avatar_icon.xml" << LL_ENDL;
            }
        }

        if(menu)
        {
            bool is_friend = LLAvatarActions::isFriend(mAvatarID);
            bool is_group_session = gAgent.isInGroup(mSessionID);

            menu->setItemEnabled("Add Friend", !is_friend);
            menu->setItemEnabled("Remove Friend", is_friend);
            menu->setItemVisible("Moderator Options Separator", is_group_session && isGroupModerator());
            menu->setItemVisible("Moderator Options", is_group_session && isGroupModerator());
            menu->setItemVisible("Group Ban Separator", is_group_session && canBanInGroup());
            menu->setItemVisible("BanMember", is_group_session && canBanInGroup());

            if(gAgentID == mAvatarID)
            {
                menu->setItemEnabled("Add Friend", false);
                menu->setItemEnabled("Send IM", false);
                menu->setItemEnabled("Remove Friend", false);
                menu->setItemEnabled("Offer Teleport",false);
                menu->setItemEnabled("Request Teleport",false);
                menu->setItemEnabled("Teleport to",false);
                menu->setItemEnabled("Voice Call", false);
                menu->setItemEnabled("Chat History", false);
                menu->setItemEnabled("Add Contact Set", false);
                menu->setItemEnabled("Invite Group", false);
                menu->setItemEnabled("Zoom In", true);
                menu->setItemEnabled("track", false);
                menu->setItemEnabled("Share", false);
                menu->setItemEnabled("Pay", false);
                menu->setItemEnabled("Block Unblock", false);
                menu->setItemEnabled("Mute Text", false);
            }
            else
            {
                if (mSessionID == LLIMMgr::computeSessionID(IM_NOTHING_SPECIAL, mAvatarID))
                {
                    menu->setItemVisible("Send IM", false);
                }
                menu->setItemEnabled("Teleport to", FSCommon::checkIsActionEnabled(mAvatarID, EFSRegistrarFunctionActionType::FS_RGSTR_ACT_TELEPORT_TO));
                menu->setItemEnabled("Offer Teleport", LLAvatarActions::canOfferTeleport(mAvatarID));
                menu->setItemEnabled("Request Teleport", LLAvatarActions::canRequestTeleport(mAvatarID));
                menu->setItemEnabled("Voice Call", LLAvatarActions::canCall());
                menu->setItemEnabled("Zoom In", FSCommon::checkIsActionEnabled(mAvatarID, EFSRegistrarFunctionActionType::FS_RGSTR_ACT_ZOOM_IN));
                menu->setItemEnabled("track", FSCommon::checkIsActionEnabled(mAvatarID, EFSRegistrarFunctionActionType::FS_RGSTR_ACT_TRACK_AVATAR));
                menu->setItemEnabled("Block Unblock", LLAvatarActions::canBlock(mAvatarID));
                menu->setItemEnabled("Mute Text", LLAvatarActions::canBlock(mAvatarID));
                menu->setItemEnabled("Chat History", LLLogChat::isTranscriptExist(mAvatarID));
            }

            menu->setItemEnabled("Map", (LLAvatarTracker::instance().isBuddyOnline(mAvatarID) && is_agent_mappable(mAvatarID)) || gAgent.isGodlike() );
            menu->buildDrawLabels();
            menu->updateParent(LLMenuGL::sMenuContainer);
            LLMenuGL::showPopup(this, menu, x, y);
        }
    }

    void showInfoCtrl()
    {
//      const bool isVisible = !mAvatarID.isNull() && !mFrom.empty() && (CHAT_SOURCE_SYSTEM != mSourceType || mType == CHAT_TYPE_RADAR) && CHAT_SOURCE_REGION != mSourceType;
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
        const bool isVisible = mShowInfoCtrl && !mAvatarID.isNull() && !mFrom.empty() && (CHAT_SOURCE_SYSTEM != mSourceType || mType == CHAT_TYPE_RADAR) && CHAT_SOURCE_REGION != mSourceType;
// [/RLVa:KB]
        if (isVisible)
        {
            const LLRect sticky_rect = mUserNameTextBox->getRect();
            S32 icon_x = llmin(sticky_rect.mLeft + mUserNameTextBox->getTextBoundingRect().getWidth() + 7, sticky_rect.mRight - 3);

            if (gSavedSettings.getBOOL("ShowChatMiniIcons"))
            {
                LLAvatarIconCtrl* icon = getChild<LLAvatarIconCtrl>("avatar_icon");
                icon_x += icon->getRect().getWidth() + icon->getRect().mLeft;
            }

            mInfoCtrl->setOrigin(icon_x, sticky_rect.getCenterY() - mInfoCtrl->getRect().getHeight() / 2 ) ;
        }
        mInfoCtrl->setVisible(isVisible);
    }

    void hideInfoCtrl()
    {
        mInfoCtrl->setVisible(false);
    }

private:
    void setTimeField(const LLChat& chat)
    {
        LLRect rect_before = mTimeBoxTextBox->getRect();

        mTimeBoxTextBox->setValue(chat.mTimeStr);

        // set necessary textbox width to fit all text
        mTimeBoxTextBox->reshapeToFitText();
        LLRect rect_after = mTimeBoxTextBox->getRect();

        // move rect to the left to correct position...
        S32 delta_pos_x = rect_before.getWidth() - rect_after.getWidth();
        S32 delta_pos_y = rect_before.getHeight() - rect_after.getHeight();
        mTimeBoxTextBox->translate(delta_pos_x, delta_pos_y);

        //... & change width of the name control
        //const LLRect& user_rect = mUserNameTextBox->getRect();
        //mUserNameTextBox->reshape(user_rect.getWidth() + delta_pos_x, user_rect.getHeight());
        const LLRect& layoutstack_rect = mHeaderLayoutStack->getRect();
        mHeaderLayoutStack->reshape(layoutstack_rect.getWidth() + delta_pos_x, layoutstack_rect.getHeight());
    }

    void fetchAvatarName()
    {
        if (mAvatarID.notNull())
        {
            if (mAvatarNameCacheConnection.connected())
            {
                mAvatarNameCacheConnection.disconnect();
            }
            mAvatarNameCacheConnection = LLAvatarNameCache::get(mAvatarID,
                boost::bind(&FSChatHistoryHeader::onAvatarNameCache, this, _1, _2));
        }
    }

    void onAvatarNameCache(const LLUUID& agent_id, const LLAvatarName& av_name)
    {
        mAvatarNameCacheConnection.disconnect();

        mFrom = av_name.getDisplayName();

        mUserNameTextBox->setValue( LLSD(mFrom) );
        mUserNameTextBox->setToolTip( av_name.getUserName() );

        if (gSavedSettings.getBOOL("NameTagShowUsernames") &&
            av_name.useDisplayNames() &&
            !av_name.isDisplayNameDefault())
        {
            LLStyle::Params style_params_name;
            LLUIColor userNameColor = LLUIColorTable::instance().getColor("EmphasisColor");
            style_params_name.color(userNameColor);
            style_params_name.font.name("SansSerifSmall");
            style_params_name.font.style(mNameStyleParams.font.style);
            style_params_name.readonly_color(userNameColor);
            mUserNameTextBox->appendText(" - " + av_name.getUserNameForDisplay(), false, style_params_name);
        }
        setToolTip( av_name.getUserName() );
        // name might have changed, update width
        updateMinUserNameWidth();
    }

protected:
    LLHandle<LLView>    mPopupMenuHandleAvatar;
    LLHandle<LLView>    mPopupMenuHandleObject;

    LLUICtrl*           mInfoCtrl;

    LLUUID              mAvatarID;
    LLSD                mObjectData;
    EChatSourceType     mSourceType;
    EChatType           mType; // FS:LO FIRE-1439 - Clickable avatar names on local chat radar crossing reports
    std::string         mFrom;
    LLUUID              mSessionID;
    std::string         mText;
    F64                 mTime; // IM's frame time
    time_t              mCreationTime; // Views's time
    // [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.2a) | Added: RLVa-1.2.0f
    bool                mShowContextMenu;
    bool                mShowInfoCtrl;
// [/RLVa:KB]

    S32                 mMinUserNameWidth;
    const LLFontGL*     mUserNameFont;
    LLTextBox*          mUserNameTextBox;
    LLTextBox*          mTimeBoxTextBox;
    LLLayoutStack*      mHeaderLayoutStack;

    LLStyle::Params     mNameStyleParams;

    bool                mNeedsTimeBox;

private:
    boost::signals2::connection mAvatarNameCacheConnection;
};

FSChatHistory::FSChatHistory(const FSChatHistory::Params& p)
:   LLTextEditor(p),    // <FS:Zi> FIRE-8600: TAB out of chat history
    mMessageHeaderFilename(p.message_header),
    mMessageSeparatorFilename(p.message_separator),
    mLeftTextPad(p.left_text_pad),
    mRightTextPad(p.right_text_pad),
    mLeftWidgetPad(p.left_widget_pad),
    mRightWidgetPad(p.right_widget_pad),
    mTopSeparatorPad(p.top_separator_pad),
    mBottomSeparatorPad(p.bottom_separator_pad),
    mTopHeaderPad(p.top_header_pad),
    mBottomHeaderPad(p.bottom_header_pad),
    mChatInputLine(NULL),   // <FS_Zi> FIRE-8602: Typing in chat history focuses chat input line
    mIsLastMessageFromLog(false),
    mScrollToBottom(false),
    mUnreadChatSources(0)
{
    mLineSpacingPixels = llclamp(gSavedSettings.getS32("FSFontChatLineSpacingPixels"), 0, 36);
    mTextVAlign = LLFontGL::VAlign::VCENTER;
    mUseColor = true;

    setIsObjectBlockedCallback(boost::bind(&LLMuteList::isMuted, LLMuteList::getInstance(), _1, _2, 0));
}

LLSD FSChatHistory::getValue() const
{
    return LLSD(getText());
}

FSChatHistory::~FSChatHistory()
{
    this->clear();
}

void FSChatHistory::updateChatInputLine()
{
    if(!mChatInputLine)
    {
        // get our focus root
        LLUICtrl* focusRoot=findRootMostFocusRoot();
        if(focusRoot)
        {
            // focus on the next item that is a text input control
            focusRoot->focusNextItem(true);
            // remember the control's pointer if it really is a LLLineEditor
            mChatInputLine = dynamic_cast<LLChatEntry*>(gFocusMgr.getKeyboardFocus());
        }
    }
}

#if LL_SDL2
void FSChatHistory::setFocus(bool b)
{
    LLTextEditor::setFocus(b);

    // IME - Don't do anything here if IME is disabled
    if (!gSavedSettings.getBOOL("SDL2IMEEnabled"))
    {
        return;
    }

    // IME - International input compositing, i.e. for Japanese / Chinese text input
    updateChatInputLine();

    if (b && mChatInputLine)
    {
        // Make sure the IME is in the right place, on top of the input line
        LLRect screen_pos = mChatInputLine->calcScreenRect();
        LLCoordGL ime_pos(screen_pos.mLeft, screen_pos.mBottom + gSavedSettings.getS32("SDL2IMEChatHistoryVerticalOffset"));

        // shift by a few pixels so the IME doesn't pop to the left side when the input
        // field is very close to the left edge
        ime_pos.mX = (S32) (ime_pos.mX * LLUI::getScaleFactor().mV[VX]) + 5;
        ime_pos.mY = (S32) (ime_pos.mY * LLUI::getScaleFactor().mV[VY]);

        getWindow()->setLanguageTextInput(ime_pos);
    }

    // this floater is not an LLPreeditor but we are only interested in the pointer anyway
    // so hopefully we will get away with this
    getWindow()->allowLanguageTextInput((LLPreeditor*) this, true);
}
#endif

void FSChatHistory::initFromParams(const FSChatHistory::Params& p)
{
    // initialize the LLTextEditor base class first ... -Zi
    LLTextEditor::initFromParams(p);
    /// then set up these properties, because otherwise they would get lost when we
    /// do this in the constructor only -Zi
    setEnabled(false);
    setReadOnly(true);
    setShowContextMenu(true);
}

LLView* FSChatHistory::getSeparator()
{
    LLPanel* separator = LLUICtrlFactory::getInstance()->createFromFile<LLPanel>(mMessageSeparatorFilename, NULL, LLPanel::child_registry_t::instance());
    return separator;
}

LLView* FSChatHistory::getHeader(const LLChat& chat,const LLStyle::Params& style_params, const LLSD& args)
{
    FSChatHistoryHeader* header = FSChatHistoryHeader::createInstance(mMessageHeaderFilename);
    if (header)
    {
        header->setup(chat, style_params, args);
    }
    return header;
}

void FSChatHistory::clear()
{
    mLastFromName.clear();
    // workaround: Setting the text to an empty line before clear() gets rid of
    // the scrollbar, if present, which otherwise would get stuck until the next
    // line was appended. -Zi
    setText(std::string(" \n"));    // <FS:Zi> FIRE-8600: TAB out of chat history
    mLastFromID = LLUUID::null;
}

enum e_moderation_options
{
    NORMAL = 0,
    BOLD = 1,
    ITALIC = 2,
    BOLD_ITALIC = 3,
    UNDERLINE = 4,
    BOLD_UNDERLINE = 5,
    ITALIC_UNDERLINE = 6,
    BOLD_ITALIC_UNDERLINE = 7
};

std::string applyModeratorStyle(U32 moderator_style)
{
    std::string style;
    switch (moderator_style)
    {
        case BOLD:
            style = "BOLD";
            break;
        case ITALIC:
            style = "ITALIC";
            break;
        case BOLD_ITALIC:
            style = "BOLDITALIC";
            break;
        case UNDERLINE:
            style = "UNDERLINE";
            break;
        case BOLD_UNDERLINE:
            style = "BOLDUNDERLINE";
            break;
        case ITALIC_UNDERLINE:
            style = "ITALICUNDERLINE";
            break;
        case BOLD_ITALIC_UNDERLINE:
            style = "BOLDITALICUNDERLINE";
            break;
        case NORMAL:
        default:
            style = "NORMAL";
            break;
    }
    return style;
}

static LLTrace::BlockTimerStatHandle FTM_APPEND_MESSAGE("Append Chat Message");

void FSChatHistory::appendMessage(const LLChat& chat, const LLSD &args, const LLStyle::Params& input_append_params)
{
    LL_RECORD_BLOCK_TIME(FTM_APPEND_MESSAGE);
    // Ansa: FIRE-12754: Hack around a weird issue where the doc size magically increases by 1px
    //       during draw if the doc exceeds the visible space and the scrollbar is getting visible.
    mScrollToBottom = (mScroller->isAtBottom() || mScroller->getScrollbar(LLScrollContainer::VERTICAL)->getDocPosMax() <= 1);

    bool use_plain_text_chat_history = args["use_plain_text_chat_history"].asBoolean();
    bool square_brackets = false; // square brackets necessary for a system messages
    bool is_p2p = args.has("is_p2p") && args["is_p2p"].asBoolean();
    bool is_conversation_log = args.has("conversation_log") && args["conversation_log"].asBoolean();    // <FS:CR> Don't dim chat in conversation log
    bool is_local = args.has("is_local") && args["is_local"].asBoolean();

    bool from_me = chat.mFromID == gAgent.getID();
    setPlainText(use_plain_text_chat_history);

    if (!scrolledToEnd() && !from_me && !chat.mFromName.empty())
    {
        mUnreadChatSources++;
        if (!mUnreadMessagesUpdateSignal.empty())
        {
            mUnreadMessagesUpdateSignal(mUnreadChatSources);
        }
    }

    F32 alpha = 1.f;
    LLUIColor txt_color = LLUIColorTable::instance().getColor("White");
    LLUIColor name_color = LLUIColorTable::instance().getColor("ChatNameColor");
    LLViewerChat::getChatColor(chat, txt_color, alpha, LLSD().with("is_local", is_local));
    LLFontGL* fontp = LLViewerChat::getChatFont();
    std::string font_name = LLFontGL::nameFromFont(fontp);
    std::string font_size = LLFontGL::sizeFromFont(fontp);

    LLStyle::Params body_message_params;
    body_message_params.color(txt_color);
    body_message_params.readonly_color(txt_color);
    body_message_params.alpha(alpha);
    body_message_params.font.name(font_name);
    body_message_params.font.size(font_size);
    body_message_params.font.style(input_append_params.font.style);

    LLStyle::Params name_params(body_message_params);
    name_params.color(name_color);
    name_params.readonly_color(name_color);
    std::string name_font_style_postfix = use_plain_text_chat_history ? "UNDERLINE" : "";
    name_params.font.style = name_font_style_postfix; // This will be used when hovering the name (LLTextBase::appendAndHighlightTextImpl() will filter it out)
    std::string delimiter_style = "NORMAL";

    // FS:LO FIRE-2899 - Faded text for IMs in nearby chat
    F32 FSIMChatHistoryFade = gSavedSettings.getF32("FSIMChatHistoryFade");

    if (FSIMChatHistoryFade > 1.0f)
    {
        FSIMChatHistoryFade = 1.0f;
        gSavedSettings.setF32("FSIMChatHistoryFade",FSIMChatHistoryFade);
    }
    // FS:LO FIRE-2899 - Faded text for IMs in nearby chat

    //IRC styled /me messages.
    bool irc_me = FSCommon::is_irc_me_prefix(chat.mText);

    // Delimiter after a name in header copy/past and in plain text mode
    std::string delimiter = ": ";
    std::string shout = LLTrans::getString("shout");
    std::string whisper = LLTrans::getString("whisper");
    if (chat.mChatType == CHAT_TYPE_SHOUT ||
        chat.mChatType == CHAT_TYPE_WHISPER ||
        // FS:TS FIRE-6049: No : in radar chat header
        chat.mChatType == CHAT_TYPE_RADAR ||
        // FS:TS FIRE-6049: No : in radar chat header
        chat.mText.compare(0, shout.length(), shout) == 0 ||
        chat.mText.compare(0, whisper.length(), whisper) == 0)
    {
        delimiter = " ";
    }

    // Don't add any delimiter after name in irc styled messages
    if (irc_me || chat.mChatStyle == CHAT_STYLE_IRC)
    {
        delimiter = LLStringUtil::null;

        // italics for emotes -Zi
        if (gSavedSettings.getBOOL("EmotesUseItalic"))
        {
            body_message_params.font.style = "ITALIC";
            name_params.font.style = "ITALIC" + name_font_style_postfix;
        }
    }

    if (chat.mChatType == CHAT_TYPE_WHISPER && gSavedSettings.getBOOL("FSEmphasizeShoutWhisper"))
    {
        body_message_params.font.style = "ITALIC";
        name_params.font.style = "ITALIC" + name_font_style_postfix;
        delimiter_style = "ITALIC";
    }
    else if(chat.mChatType == CHAT_TYPE_SHOUT && gSavedSettings.getBOOL("FSEmphasizeShoutWhisper"))
    {
        body_message_params.font.style = "BOLD";
        name_params.font.style = "BOLD" + name_font_style_postfix;
        delimiter_style = "BOLD";
    }

    bool message_from_log = (chat.mChatStyle == CHAT_STYLE_HISTORY || chat.mChatStyle == CHAT_STYLE_SERVER_HISTORY);
    bool teleport_separator = chat.mSourceType == CHAT_SOURCE_TELEPORT;
    // We graying out chat history by graying out messages that contains full date in a time string
    if (message_from_log && !is_conversation_log)
    {
        if (chat.mChatStyle == CHAT_STYLE_HISTORY)
        {
            txt_color = LLUIColorTable::instance().getColor("ChatHistoryMessageFromLog");
        }
        else if (chat.mChatStyle == CHAT_STYLE_SERVER_HISTORY)
        {
            txt_color = LLUIColorTable::instance().getColor("ChatHistoryMessageFromServerLog");
        }
        body_message_params.color(txt_color);
        body_message_params.readonly_color(txt_color);
        name_params.color(txt_color);
        name_params.readonly_color(txt_color);
    }

    //<FS:HG> FS-1734 seperate name and text styles for moderator
    bool moderator_style_active = false;
    U32 moderator_name_style_value = gSavedSettings.getU32("FSModNameStyle");
    U32 moderator_body_style_value = gSavedSettings.getU32("FSModTextStyle");
    std::string moderator_name_style = applyModeratorStyle(moderator_name_style_value);
    std::string moderator_body_style = applyModeratorStyle(moderator_body_style_value);
    std::string moderator_timestamp_style = moderator_name_style;

    if (chat.mChatStyle == CHAT_STYLE_MODERATOR)
    {
        moderator_style_active = true;

        delimiter_style = moderator_name_style;
        if (moderator_name_style_value < UNDERLINE)
        {
            // Need to add "UNDERLINE" here because we want to underline the name on hover
            moderator_name_style += name_font_style_postfix;
        }
        else
        {
            // Always contains underline - don't show it on hover only
            name_params.can_underline_on_hover = false;
        }
        name_params.font.style(moderator_name_style);
        body_message_params.font.style(moderator_body_style);

        if ( irc_me && gSavedSettings.getBOOL("EmotesUseItalic") )
        {
            if ( (ITALIC & moderator_name_style_value) != ITALIC )//HG: if ITALIC isn't one of the styles... add it
            {
                moderator_name_style += "ITALIC";
                moderator_timestamp_style += "ITALIC";
                name_params.font.style(moderator_name_style);
            }
            if ( (ITALIC & moderator_body_style_value) != ITALIC )
            {
                moderator_body_style += "ITALIC";
                body_message_params.font.style(moderator_body_style);
            }
            body_message_params.font.style(moderator_body_style);
        }
    }
    //</FS:HG> FS-1734 seperate name and text styles for moderator

    bool prependNewLineState = getText().size() != 0;

    // compact mode: show a timestamp and name
    if (use_plain_text_chat_history)
    {
        square_brackets = (chat.mSourceType == CHAT_SOURCE_SYSTEM && chat.mChatType != CHAT_TYPE_RADAR && gSavedSettings.getBOOL("FSIMSystemMessageBrackets"));

        LLStyle::Params timestamp_style(body_message_params);

        // out of the timestamp
        if (args["show_time"].asBoolean() && !teleport_separator)
        {
            LLUIColor timestamp_color = LLUIColorTable::instance().getColor("ChatTimestampColor");
            timestamp_style.color(timestamp_color);
            timestamp_style.readonly_color(timestamp_color);
            if (message_from_log && !is_conversation_log)
            {
                timestamp_style.color.alpha = FSIMChatHistoryFade;
                timestamp_style.readonly_color.alpha = FSIMChatHistoryFade;
            }
            //<FS:HG> FS-1734 seperate name and text styles for moderator
            if ( moderator_style_active )
            {
                timestamp_style.font.style(moderator_timestamp_style);
            }
            //</FS:HG> FS-1734 seperate name and text styles for moderator
            appendText("[" + chat.mTimeStr + "] ", prependNewLineState, timestamp_style);
            prependNewLineState = false;
        }

        // out the opening square bracket (if need)
        if (square_brackets)
        {
            appendText("[", prependNewLineState, body_message_params);
            prependNewLineState = false;
        }

        // names showing
        if ( (!is_p2p || args["show_names_for_p2p_conv"].asBoolean()) &&
            utf8str_trim(chat.mFromName).size() != 0)
        {
            // Don't hotlink any messages from the system (e.g. "Second Life:"), so just add those in plain text.
            if ( chat.mSourceType == CHAT_SOURCE_OBJECT && chat.mFromID.notNull())
            {
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.0f) | Added: RLVa-1.2.0f
                // NOTE-RLVa: we don't need to do any @shownames or @showloc filtering here because we'll already have an existing URL
                std::string url = chat.mURL;
                RLV_ASSERT( (url.empty()) || (std::string::npos != url.find("objectim")) );
                if ( (url.empty()) || (std::string::npos == url.find("objectim")) )
                {
// [/RLVa:KB]
                    // for object IMs, create a secondlife:///app/objectim SLapp
                    /*std::string*/ url = LLViewerChat::getSenderSLURL(chat, args);
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.0f) | Added: RLVa-1.2.0f
                }
// [/RLVa:KB]

                // set the link for the object name to be the objectim SLapp
                // (don't let object names with hyperlinks override our objectim Url)
                LLStyle::Params link_params(body_message_params);
                link_params.color.control = "ChatNameObjectColor";
                LLUIColor link_color = LLUIColorTable::instance().getColor("ChatNameObjectColor");
                link_params.color = link_color;
                link_params.readonly_color = link_color;
                if (message_from_log && !is_conversation_log)
                {
                    link_params.color.alpha = FSIMChatHistoryFade;
                    link_params.readonly_color.alpha = FSIMChatHistoryFade;
                }
                link_params.is_link = true;
                link_params.link_href = url;

                appendText(chat.mFromName + delimiter, prependNewLineState, link_params);   // <FS:Zi> FIRE-8600: TAB out of chat history
                prependNewLineState = false;
            }
//          else if (chat.mFromName != SYSTEM_FROM && chat.mFromID.notNull() && !message_from_log && chat.mSourceType != CHAT_SOURCE_REGION)
// [RLVa:KB] - Checked: 2010-04-22 (RLVa-1.2.0f) | Added: RLVa-1.2.0f
            else if (chat.mFromName != SYSTEM_FROM && chat.mFromID.notNull() && !message_from_log && chat.mSourceType != CHAT_SOURCE_REGION && !chat.mRlvNamesFiltered)
// [/RLVa:KB]
            {
                name_params.color = name_color;
                name_params.readonly_color = name_color;
                if (chat.mChatType == CHAT_TYPE_IM || chat.mChatType == CHAT_TYPE_IM_GROUP)
                {
                    name_params.color.alpha = FSIMChatHistoryFade;
                    name_params.readonly_color.alpha = FSIMChatHistoryFade;
                    appendText(LLTrans::getString("IMPrefix") + " ", prependNewLineState, name_params);
                    prependNewLineState = false;

                    if (!chat.mFromNameGroup.empty())
                    {
                        appendText(chat.mFromNameGroup, prependNewLineState, name_params);
                        prependNewLineState = false;
                    }
                }

                name_params.use_default_link_style = false;
                name_params.link_href = LLSLURL(from_me ? "agentself" : "agent", chat.mFromID, "inspect").getSLURLString();

                // Add link to avatar's inspector and delimiter to message.
                appendText(std::string(name_params.link_href), prependNewLineState, name_params);

                prependNewLineState = false;

                if (delimiter.length() > 0 && delimiter[0] == ':')
                {
                    LLStyle::Params delimiter_params(body_message_params);
                    delimiter_params.font.style = delimiter_style;

                    appendText(":", prependNewLineState, delimiter_params);
                    prependNewLineState = false;

                    appendText(delimiter.substr(1, std::string::npos), prependNewLineState, body_message_params);
                }
                else
                {
                    appendText(delimiter, prependNewLineState, body_message_params);
                }
                prependNewLineState = false;
            }
            else if (teleport_separator)
            {
                std::string tp_text = LLTrans::getString("teleport_preamble_compact_chat");
                appendText(tp_text + " <nolink>" + chat.mFromName + "</nolink>",
                    prependNewLineState, body_message_params);
                prependNewLineState = false;
            }
            else
            {
                appendText("<nolink>" + chat.mFromName + "</nolink>" + delimiter,
                        prependNewLineState, body_message_params);
                prependNewLineState = false;
            }
        }
    }
    else // showing timestamp and name in the expanded mode
    {
        prependNewLineState = false;
        LLView* view = NULL;
        LLInlineViewSegment::Params p;
        p.force_newline = true;
        p.left_pad = mLeftWidgetPad;
        p.right_pad = mRightWidgetPad;

        LLDate new_message_time = LLDate::now();
        bool needs_header_text = false;

        if (!teleport_separator
            && mLastFromName == chat.mFromName
            && mLastFromID == chat.mFromID
            && mLastMessageTime.notNull()
            && (new_message_time.secondsSinceEpoch() - mLastMessageTime.secondsSinceEpoch()) < 60.0
            && mIsLastMessageFromLog == message_from_log)  //distinguish between current and previous chat session's histories
        {
            view = getSeparator();
            p.top_pad = mTopSeparatorPad;
            p.bottom_pad = mBottomSeparatorPad;
            if (!view)
            {
                // Might be wiser to make this LL_ERRS, getSeparator() should work in case of correct instalation.
                LL_WARNS() << "Failed to create separator from " << mMessageSeparatorFilename << ": can't append to history" << LL_ENDL;
                return;
            }
        }
        else
        {
            needs_header_text = true;
            view = getHeader(chat, name_params, args);
            if (getLength() == 0)
                p.top_pad = 0;
            else
                p.top_pad = mTopHeaderPad;
            if (teleport_separator)
            {
                p.bottom_pad = mBottomSeparatorPad;
            }
            else
            {
                p.bottom_pad = mBottomHeaderPad;
            }
            if (!view)
            {
                LL_WARNS() << "Failed to create header from " << mMessageHeaderFilename << ": can't append to history" << LL_ENDL;
                return;
            }
        }
        p.view = view;

        //Prepare the rect for the view
        LLRect target_rect = getDocumentView()->getRect();  // <FS:Zi> FIRE-8600: TAB out of chat history
        // squeeze down the widget by subtracting padding off left and right
        target_rect.mLeft += mLeftWidgetPad + getHPad();    // <FS:Zi> FIRE-8600: TAB out of chat history
        target_rect.mRight -= mRightWidgetPad;
        view->reshape(target_rect.getWidth(), view->getRect().getHeight());
        view->setOrigin(target_rect.mLeft, view->getRect().mBottom);

        std::string widget_associated_text = "\n";
        if (needs_header_text)
        {
            widget_associated_text += "[" + chat.mTimeStr + "] ";
            if (utf8str_trim(chat.mFromName).size() != 0 && chat.mFromName != SYSTEM_FROM)
            {
                widget_associated_text += chat.mFromName + delimiter;
            }
        }

        appendWidget(p, widget_associated_text, false); // <FS:Zi> FIRE-8600: TAB out of chat history

        mLastFromName = chat.mFromName;
        mLastFromID = chat.mFromID;
        mLastMessageTime = new_message_time;
        mIsLastMessageFromLog = message_from_log;
    }

    // body of the message processing

    // notify processing
    if (chat.mNotifId.notNull())
    {
        LLNotificationPtr notification = LLNotificationsUtil::find(chat.mNotifId);
        if (notification != NULL)
        {
            bool create_toast = true;
            if (notification->getName() == "OfferFriendship")
            {
                // We don't want multiple friendship offers to appear, this code checks if there are previous offers
                // by iterating though all panels.
                // Note: it might be better to simply add a "pending offer" flag somewhere
                for (auto& ti : LLToastNotifyPanel::instance_snapshot())
                {
                    LLIMToastNotifyPanel * imtoastp = dynamic_cast<LLIMToastNotifyPanel *>(&ti);
                    const std::string& notification_name = ti.getNotificationName();
                    if (notification_name == "OfferFriendship"
                        && ti.isControlPanelEnabled()
                        && imtoastp)
                    {
                        create_toast = false;
                        break;
                    }
                }
            }

            if (create_toast)
            {
                LLIMToastNotifyPanel* notify_box = new LLIMToastNotifyPanel(
                        notification, chat.mSessionID, LLRect::null, true, this);

                //Prepare the rect for the view
                LLRect target_rect = getDocumentView()->getRect();
                // squeeze down the widget by subtracting padding off left and right
                target_rect.mLeft += mLeftWidgetPad + getHPad();
                target_rect.mRight -= mRightWidgetPad;
                notify_box->reshape(target_rect.getWidth(), notify_box->getRect().getHeight());
                notify_box->setOrigin(target_rect.mLeft, notify_box->getRect().mBottom);

                LLInlineViewSegment::Params params;
                params.view = notify_box;
                params.left_pad = mLeftWidgetPad;
                params.right_pad = mRightWidgetPad;
                appendWidget(params, "\n", false);
            }
        }
    }

    // usual messages showing
    else if (!teleport_separator)
    {
        std::string message = irc_me ? chat.mText.substr(3) : chat.mText;

        //MESSAGE TEXT PROCESSING
        //*HACK getting rid of redundant sender names in system notifications sent using sender name (see EXT-5010)
        if (use_plain_text_chat_history && !from_me && chat.mFromID.notNull())
        {
            std::string slurl_about = SLURL_APP_AGENT + chat.mFromID.asString() + SLURL_ABOUT;
            if (message.length() > slurl_about.length() &&
                message.compare(0, slurl_about.length(), slurl_about) == 0)
            {
                message = message.substr(slurl_about.length(), message.length()-1);
            }
        }

        if (irc_me && !use_plain_text_chat_history)
        {
            if (chat.mSourceType == CHAT_SOURCE_AGENT)
            {
                static LLCachedControl<bool> useDisplayNames(gSavedSettings, "UseDisplayNames");
                static LLCachedControl<bool> nameTagShowUsernames(gSavedSettings, "NameTagShowUsernames");

                std::string name_format = (useDisplayNames && nameTagShowUsernames) ? "completename" : "displayname";
                if (is_local && gRlvHandler.hasBehaviour(RLV_BHVR_SHOWNAMES))
                {
                    name_format = "rlvanonym";
                }
                message = LLSLURL("agent", chat.mFromID, name_format).getSLURLString() + message;
            }
            else
            {
                message = chat.mFromName + message;
            }
        }

        if(chat.mSourceType != CHAT_SOURCE_OBJECT && (chat.mChatType == CHAT_TYPE_IM || chat.mChatType == CHAT_TYPE_IM_GROUP)) // FS::LO Fix for FIRE-6334; Fade IM Text into background of chat history default setting should not be 0.5; made object IM text not fade into the background as per phoenix behavior.
        {
            body_message_params.color.alpha = FSIMChatHistoryFade;
            body_message_params.readonly_color.alpha = FSIMChatHistoryFade;
            body_message_params.selected_color.alpha = FSIMChatHistoryFade;
        }
        // FS:LO FIRE-2899 - Faded text for IMs in nearby chat

        if (square_brackets)
        {
            message += "]";
        }

        bool is_trusted = isContentTrusted();
        setContentTrusted(chat.mFromID.isNull() && is_p2p); // <FS:Ansariel> Set trusted content temporarily for system messages
        setPlainText((use_plain_text_chat_history && is_p2p) ? chat.mFromID.notNull() : use_plain_text_chat_history);
        appendText(message, prependNewLineState, body_message_params);  // <FS:Zi> FIRE-8600: TAB out of chat history
        setContentTrusted(is_trusted);
        setPlainText(use_plain_text_chat_history);
        // Uncomment this if we never need to append to the end of a message. [FS:CR]
        //prependNewLineState = false;
    }

    blockUndo();    // <FS:Zi> FIRE-8600: TAB out of chat history

    // automatically scroll to end when receiving chat from myself
    if (from_me)
    {
        setCursorAndScrollToEnd();  // <FS:Zi> FIRE-8600: TAB out of chat history
    }
}

// <FS_Zi> FIRE-8602: Typing in chat history focuses chat input line
bool FSChatHistory::handleUnicodeCharHere(llwchar uni_char)
{
    // do not change focus when the CTRL key is used to make copy/select all etc. possible
    if(gKeyboard->currentMask(false) & MASK_CONTROL)
    {
        // instead, let the base class handle things
        return LLTextEditor::handleUnicodeCharHere(uni_char);
    }

    // we might not know which is our chat input line yet
    updateChatInputLine();

    // do we know our chat input line now?
    if(mChatInputLine)
    {
        // we do, so focus on it
        mChatInputLine->setFocus(true);
        // and let it handle the keystroke
        return mChatInputLine->handleUnicodeCharHere(uni_char);
    }

    // we don't know what to do, so let our base class handle the keystroke
    return LLTextEditor::handleUnicodeCharHere(uni_char);
}

void FSChatHistory::draw()
{
    LLTextEditor::draw();
    // Ansa: FIRE-12754: Hack around a weird issue where the doc size magically increases by 1px
    //       during draw if the doc exceeds the visible space and the scrollbar is getting visible.
    if (mScrollToBottom)
    {
        mScroller->goToBottom();
        mScrollToBottom = false;
    }

    if (scrolledToEnd() && mUnreadChatSources != 0)
    {
        mUnreadChatSources = 0;
        if (!mUnreadMessagesUpdateSignal.empty())
        {
            mUnreadMessagesUpdateSignal(mUnreadChatSources);
        }
    }
}
// </FS:Zi>