/**
 * @file llchathistory.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 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 "llchathistory.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 "llmutelist.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 "llviewerobjectlist.h"

static LLDefaultChildRegistry::Register<LLChatHistory> r("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"];
        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 LLChatHistoryHeader: public LLPanel
{
public:
    LLChatHistoryHeader()
    :   LLPanel(),
        mInfoCtrl(NULL),
        mPopupMenuHandleAvatar(),
        mPopupMenuHandleObject(),
        mAvatarID(),
        mSourceType(CHAT_SOURCE_UNKNOWN),
        mFrom(),
        mSessionID(),
        mCreationTime(time_corrected()),
        mMinUserNameWidth(0),
        mUserNameFont(NULL),
        mUserNameTextBox(NULL),
        mTimeBoxTextBox(NULL),
        mNeedsTimeBox(true),
        mIsFromScript(false),
        mAvatarNameCacheConnection()
    {}

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

    ~LLChatHistoryHeader()
    {
        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));

            LLFloaterSidePanelContainer::showPanel("people", "panel_people",
                LLSD().with("people_panel_tab_name", "blocked_panel").with("blocked_to_select", 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);
        }

    }

    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);
        }
        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 level = userdata.asString();

        if (level == "profile")
        {
            LLAvatarActions::showProfile(getAvatarId());
        }
        else if (level == "im")
        {
            LLAvatarActions::startIM(getAvatarId());
        }
        else if (level == "teleport")
        {
            LLAvatarActions::offerTeleport(getAvatarId());
        }
        else if (level == "request_teleport")
        {
            LLAvatarActions::teleportRequest(getAvatarId());
        }
        else if (level == "voice_call")
        {
            LLAvatarActions::startCall(getAvatarId());
        }
        else if (level == "chat_history")
        {
            LLAvatarActions::viewChatHistory(getAvatarId());
        }
        else if (level == "add")
        {
            LLAvatarActions::requestFriendshipDialog(getAvatarId(), mFrom);
        }
        else if (level == "remove")
        {
            LLAvatarActions::removeFriendDialog(getAvatarId());
        }
        else if (level == "invite_to_group")
        {
            LLAvatarActions::inviteToGroup(getAvatarId());
        }
        else if (level == "zoom_in")
        {
            handle_zoom_to_object(getAvatarId());
        }
        else if (level == "map")
        {
            LLAvatarActions::showOnMap(getAvatarId());
        }
        else if (level == "share")
        {
            LLAvatarActions::share(getAvatarId());
        }
        else if (level == "pay")
        {
            LLAvatarActions::pay(getAvatarId());
        }
        else if (level == "report_abuse")
        {
            std::string time_string;
            if (mTime > 0) // have frame time
            {
                time_t current_time = time_corrected();
                time_t message_time = 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(level == "block_unblock")
        {
            LLAvatarActions::toggleMute(getAvatarId(), LLMute::flagVoiceChat);
        }
        else if(level == "mute_unmute")
        {
            LLAvatarActions::toggleMute(getAvatarId(), LLMute::flagTextChat);
        }
        else if(level == "toggle_allow_text_chat")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            speaker_mgr->toggleAllowTextChat(getAvatarId());
        }
        else if(level == "group_mute")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                speaker_mgr->moderateVoiceParticipant(getAvatarId(), false);
            }
        }
        else if(level == "group_unmute")
        {
            LLIMSpeakerMgr* speaker_mgr = LLIMModel::getInstance()->getSpeakerManager(mSessionID);
            if (speaker_mgr)
            {
                speaker_mgr->moderateVoiceParticipant(getAvatarId(), true);
            }
        }
        else if(level == "ban_member")
        {
            banGroupMember(getAvatarId());
        }
    }

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

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

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

        if (level == "can_allow_text_chat" || level == "can_mute" || level == "can_unmute")
        {
            return canModerate(userdata);
        }
        else if (level == "report_abuse")
        {
            return gAgentID != mAvatarID;
        }
        else if (level == "can_ban_member")
        {
            return canBanGroupMember(getAvatarId());
        }
        return false;
    }

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

        if (level == "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 (level == "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(&LLChatHistoryHeader::showInspector, this));

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

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

        mInfoCtrl = LLUICtrlFactory::getInstance()->createFromFile<LLUICtrl>("inspector_info_ctrl.xml", this, LLPanel::child_registry_t::instance());
        if (mInfoCtrl)
        {
            mInfoCtrl->setCommitCallback(boost::bind(&LLChatHistoryHeader::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;

        if (mSourceType == CHAT_SOURCE_OBJECT)
        {
            LLFloaterReg::showInstance("inspect_remote_object", mObjectData);
        }
        else if (mSourceType == CHAT_SOURCE_AGENT)
        {
            LLFloaterReg::showInstance("inspect_avatar", LLSD().with("avatar_id", mAvatarID));
        }
        //if chat source is system, you may add "else" here to define behaviour.
    }

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

        LLChatHistoryHeader* header = dynamic_cast<LLChatHistoryHeader*>(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, bool is_script)
    {
        mAvatarID = chat.mFromID;
        mSessionID = chat.mSessionID;
        mSourceType = chat.mSourceType;
        mIsFromScript = is_script;
        mPrefix = mIsFromScript ? LLTrans::getString("ScriptBy") : "";

        // 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;
        }

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

        if (mSourceType == CHAT_SOURCE_TELEPORT
            && chat.mChatStyle == CHAT_STYLE_TELEPORT_SEP)
        {
            mFrom = chat.mFromName;
            mNeedsTimeBox = false;
            user_name->setValue(mFrom);
            updateMinUserNameWidth();
            LLColor4 sep_color = LLUIColorTable::instance().getColor("ChatTeleportSeparatorColor");
            setTransparentColor(sep_color);
            mTimeBoxTextBox->setVisible(false);
        }
        else if (chat.mFromName.empty()
                 || mSourceType == CHAT_SOURCE_SYSTEM)
        {
            mFrom = LLTrans::getString("SECOND_LIFE");
            if(!chat.mFromName.empty() && (mFrom != chat.mFromName))
            {
                mFrom += " (" + chat.mFromName + ")";
            }
            user_name->setValue(mFrom);
            updateMinUserNameWidth();
        }
        else if (mSourceType == CHAT_SOURCE_AGENT
                 && !mAvatarID.isNull()
                 && 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();
        }
        else if (chat.mChatStyle == CHAT_STYLE_HISTORY ||
                 mSourceType == CHAT_SOURCE_AGENT)
        {
            //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);
                user_name->setValue(mPrefix + mFrom);

                if (gSavedSettings.getBOOL("NameTagShowUsernames"))
                {
                    std::string username = chat.mFromName.substr(username_start + 2);
                    username = username.substr(0, username.length() - 1);
                    LLStyle::Params style_params_name;
                    LLColor4 userNameColor = LLUIColorTable::instance().getColor("EmphasisColor");
                    style_params_name.color(userNameColor);
                    style_params_name.font.name("SansSerifSmall");
                    style_params_name.font.style("NORMAL");
                    style_params_name.readonly_color(userNameColor);
                    user_name->appendText("  - " + username, false, style_params_name);
                }
            }
            else
            {
                mFrom = chat.mFromName;
                user_name->setValue(mFrom);
                updateMinUserNameWidth();
            }
        }
        else
        {
            // ...from an object, just use name as given
            mFrom = chat.mFromName;
            user_name->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);

        switch (mSourceType)
        {
            case CHAT_SOURCE_AGENT:
                icon->setValue(mIsFromScript ? LLSD("Inv_Script") : LLSD(chat.mFromID));
                break;
            case CHAT_SOURCE_OBJECT:
                icon->setValue(LLSD("OBJECT_Icon"));
                break;
            case CHAT_SOURCE_SYSTEM:
            case CHAT_SOURCE_REGION:
                icon->setValue(LLSD("SL_Logo"));
                break;
            case CHAT_SOURCE_TELEPORT:
                icon->setValue(LLSD("Command_Destinations_Icon"));
                break;
            case CHAT_SOURCE_UNKNOWN:
                icon->setValue(mIsFromScript ? LLSD("Inv_Script") : LLSD("Unknown_Icon"));
        }

        // 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() && LLWorld::instanceExists())
            {
                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()
    {
        LLTextBox* user_name = mUserNameTextBox; //getChild<LLTextBox>("user_name");
        LLTextBox* time_box = mTimeBoxTextBox; //getChild<LLTextBox>("time_box");

        LLRect user_name_rect = user_name->getRect();
        S32 user_name_width = user_name_rect.getWidth();
        S32 time_box_width = time_box->getRect().getWidth();

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

            time_box->setVisible(true);
        }

        LLPanel::draw();
    }

    void updateMinUserNameWidth()
    {
        if (mUserNameFont)
        {
            LLTextBox* user_name = getChild<LLTextBox>("user_name");
            const LLWString& text = user_name->getWText();
            mMinUserNameWidth = mUserNameFont->getWidth(text.c_str()) + PADDING;
        }
    }

protected:
    static const S32 PADDING = 20;

    void showContextMenu(S32 x,S32 y)
    {
        if(mSourceType == CHAT_SOURCE_SYSTEM)
            showSystemContextMenu(x,y);
        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)
        {
            ScopedRegistrarHelper registrar;
            LLUICtrl::EnableCallbackRegistry::ScopedRegistrar registrar_enable;
            registrar.add("ObjectIcon.Action", boost::bind(&LLChatHistoryHeader::onObjectIconContextMenuItemClicked, this, _2));
            registrar_enable.add("ObjectIcon.Visible", boost::bind(&LLChatHistoryHeader::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)
        {
            ScopedRegistrarHelper registrar;
            LLUICtrl::EnableCallbackRegistry::ScopedRegistrar registrar_enable;
            registrar.add("AvatarIcon.Action", boost::bind(&LLChatHistoryHeader::onAvatarIconContextMenuItemClicked, this, _2), cb_info::UNTRUSTED_BLOCK);
            registrar_enable.add("AvatarIcon.Check", boost::bind(&LLChatHistoryHeader::onAvatarIconContextMenuItemChecked, this, _2));
            registrar_enable.add("AvatarIcon.Enable", boost::bind(&LLChatHistoryHeader::onAvatarIconContextMenuItemEnabled, this, _2));
            registrar_enable.add("AvatarIcon.Visible", boost::bind(&LLChatHistoryHeader::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("Voice Call", false);
                menu->setItemEnabled("Chat History", false);
                menu->setItemEnabled("Invite Group", false);
                menu->setItemEnabled("Zoom In", false);
                menu->setItemEnabled("Share", false);
                menu->setItemEnabled("Pay", false);
                menu->setItemEnabled("Block Unblock", false);
                menu->setItemEnabled("Mute Text", false);
            }
            else
            {
                LLUUID currentSessionID = LLIMMgr::computeSessionID(IM_NOTHING_SPECIAL, mAvatarID);
                if (mSessionID == currentSessionID)
            {
                menu->setItemVisible("Send IM", false);
            }
                menu->setItemEnabled("Offer Teleport", LLAvatarActions::canOfferTeleport(mAvatarID));
                menu->setItemEnabled("Request Teleport", LLAvatarActions::canOfferTeleport(mAvatarID));
                menu->setItemEnabled("Voice Call", LLAvatarActions::canCall());

                // We should only show 'Zoom in' item in a nearby chat
                bool should_show_zoom = !LLIMModel::getInstance()->findIMSession(currentSessionID);
                menu->setItemVisible("Zoom In", should_show_zoom && gObjectList.findObject(mAvatarID));
                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 && CHAT_SOURCE_REGION != mSourceType;
        if (isVisible)
        {
            const LLRect sticky_rect = mUserNameTextBox->getRect();
            S32 icon_x = llmin(sticky_rect.mLeft + mUserNameTextBox->getTextBoundingRect().getWidth() + 7, sticky_rect.mRight - 3);
            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)
    {
        LLTextBox* time_box = getChild<LLTextBox>("time_box");

        LLRect rect_before = time_box->getRect();

        time_box->setValue(chat.mTimeStr);

        // set necessary textbox width to fit all text
        time_box->reshapeToFitText();
        LLRect rect_after = time_box->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();
        time_box->translate(delta_pos_x, delta_pos_y);

        //... & change width of the name control
        LLView* user_name = getChild<LLView>("user_name");
        const LLRect& user_rect = user_name->getRect();
        user_name->reshape(user_rect.getWidth() + delta_pos_x, user_rect.getHeight());
    }

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

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

        mFrom = av_name.getDisplayName();

        LLTextBox* user_name = getChild<LLTextBox>("user_name");
        user_name->setValue(LLSD(mPrefix + av_name.getDisplayName()));
        user_name->setToolTip( av_name.getUserName() );

        if (gSavedSettings.getBOOL("NameTagShowUsernames") &&
            av_name.useDisplayNames() &&
            !av_name.isDisplayNameDefault())
        {
            LLStyle::Params style_params_name;
            LLColor4 userNameColor = LLUIColorTable::instance().getColor("EmphasisColor");
            style_params_name.color(userNameColor);
            style_params_name.font.name("SansSerifSmall");
            style_params_name.font.style("NORMAL");
            style_params_name.readonly_color(userNameColor);
            user_name->appendText("  - " + av_name.getUserName(), 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;
    std::string         mFrom;
    LLUUID              mSessionID;
    std::string         mText;
    F64                 mTime; // IM's frame time
    time_t              mCreationTime; // Views's time

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

    bool                mNeedsTimeBox;

    bool                mIsFromScript;
    std::string         mPrefix;

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

LLChatHistory::LLChatHistory(const LLChatHistory::Params& p)
:   LLUICtrl(p),
    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),
    mIsLastMessageFromLog(false),
    mIsLastFromScript(false),
    mNotifyAboutUnreadMsg(p.notify_unread_msg)
{
    LLTextEditor::Params editor_params(p);
    editor_params.rect = getLocalRect();
    editor_params.follows.flags = FOLLOWS_ALL;
    editor_params.enabled = false; // read only
    editor_params.show_context_menu = "true";
    editor_params.trusted_content = false;
    editor_params.text_valign = LLFontGL::VAlign::VCENTER;
    editor_params.use_color = true;
    mEditor = LLUICtrlFactory::create<LLTextEditor>(editor_params, this);
    mEditor->setIsFriendCallback(LLAvatarActions::isFriend);
    mEditor->setIsObjectBlockedCallback(boost::bind(&LLMuteList::isMuted, LLMuteList::getInstance(), _1, _2, 0));

}

LLSD LLChatHistory::getValue() const
{
    return LLSD(mEditor->getText());
}

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

void LLChatHistory::initFromParams(const LLChatHistory::Params& p)
{
    static LLUICachedControl<S32> scrollbar_size ("UIScrollbarSize", 0);

    LLRect stack_rect = getLocalRect();
    stack_rect.mRight -= scrollbar_size;
    LLLayoutStack::Params layout_p;
    layout_p.rect = stack_rect;
    layout_p.follows.flags = FOLLOWS_ALL;
    layout_p.orientation = LLLayoutStack::VERTICAL;
    layout_p.mouse_opaque = false;

    LLLayoutStack* stackp = LLUICtrlFactory::create<LLLayoutStack>(layout_p, this);

    const S32 NEW_TEXT_NOTICE_HEIGHT = 20;

    LLLayoutPanel::Params panel_p;
    panel_p.name = "spacer";
    panel_p.background_visible = false;
    panel_p.has_border = false;
    panel_p.mouse_opaque = false;
    panel_p.min_dim = 30;
    panel_p.auto_resize = true;
    panel_p.user_resize = false;

    stackp->addPanel(LLUICtrlFactory::create<LLLayoutPanel>(panel_p), LLLayoutStack::ANIMATE);

    panel_p.name = "new_text_notice_holder";
    LLRect new_text_notice_rect = getLocalRect();
    new_text_notice_rect.mTop = new_text_notice_rect.mBottom + NEW_TEXT_NOTICE_HEIGHT;
    panel_p.rect = new_text_notice_rect;
    panel_p.background_opaque = true;
    panel_p.background_visible = true;
    panel_p.visible = false;
    panel_p.min_dim = 0;
    panel_p.auto_resize = false;
    panel_p.user_resize = false;
    mMoreChatPanel = LLUICtrlFactory::create<LLLayoutPanel>(panel_p);

    LLTextBox::Params text_p(p.more_chat_text);
    text_p.rect = mMoreChatPanel->getLocalRect();
    text_p.follows.flags = FOLLOWS_ALL;
    text_p.name = "more_chat_text";
    mMoreChatText = LLUICtrlFactory::create<LLTextBox>(text_p, mMoreChatPanel);
    mMoreChatText->setClickedCallback(boost::bind(&LLChatHistory::onClickMoreText, this));

    stackp->addPanel(mMoreChatPanel, LLLayoutStack::ANIMATE);
}


/*void LLChatHistory::updateTextRect()
{
    static LLUICachedControl<S32> texteditor_border ("UITextEditorBorder", 0);

    LLRect old_text_rect = mVisibleTextRect;
    mVisibleTextRect = mScroller->getContentWindowRect();
    mVisibleTextRect.stretch(-texteditor_border);
    mVisibleTextRect.mLeft += mLeftTextPad;
    mVisibleTextRect.mRight -= mRightTextPad;
    if (mVisibleTextRect != old_text_rect)
    {
        needsReflow();
    }
}*/

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

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

void LLChatHistory::onClickMoreText()
{
    mEditor->endOfDoc();
}

void LLChatHistory::clear()
{
    mLastFromName.clear();
    mEditor->clear();
    mLastFromID = LLUUID::null;
}

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

void LLChatHistory::appendMessage(const LLChat& chat, const LLSD &args, const LLStyle::Params& input_append_params)
{
    LL_RECORD_BLOCK_TIME(FTM_APPEND_MESSAGE);
    bool use_plain_text_chat_history = args["use_plain_text_chat_history"].asBoolean();
    bool square_brackets = false; // square brackets necessary for a system messages

    llassert(mEditor);
    if (!mEditor)
        return;

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

    if (mNotifyAboutUnreadMsg && !mEditor->scrolledToEnd() && !from_me && !chat.mFromName.empty())
    {
        mUnreadChatSources.insert(chat.mFromName);
        mMoreChatPanel->setVisible(true);
        std::string chatters;
        for (const std::string& source : mUnreadChatSources)
        {
            chatters += chatters.size() ? ", " + source : source;
        }
        LLStringUtil::format_map_t args;
        args["SOURCES"] = chatters;

        std::string xml_desc = mUnreadChatSources.size() == 1 ?
            "unread_chat_single" : "unread_chat_multiple";
        mMoreChatText->setValue(LLTrans::getString(xml_desc, args));
        S32 height = mMoreChatText->getTextPixelHeight() + 5;
        mMoreChatPanel->reshape(mMoreChatPanel->getRect().getWidth(), height);
    }

    LLColor4 txt_color = LLUIColorTable::instance().getColor("White");
    LLColor4 name_color(txt_color);

    LLViewerChat::getChatColor(chat,txt_color);
    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.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);

    auto [message, is_lua] = LLStringUtil::withoutPrefix(chat.mText, LUA_PREFIX);
    std::string prefix = message.substr(0, 4);
    //IRC styled /me messages.
    bool irc_me = prefix == "/me " || prefix == "/me'";

    // 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 ||
        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;
        body_message_params.font.style = "ITALIC";
    }

    if (chat.mChatType == CHAT_TYPE_WHISPER)
    {
        body_message_params.font.style = "ITALIC";
    }
    else if (chat.mChatType == CHAT_TYPE_SHOUT)
    {
        body_message_params.font.style = "BOLD";
    }

    bool message_from_log = chat.mChatStyle == CHAT_STYLE_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)
    {
        txt_color = LLColor4::grey;
        body_message_params.color(txt_color);
        body_message_params.readonly_color(txt_color);
        name_params.color(txt_color);
        name_params.readonly_color(txt_color);
    }

    bool prependNewLineState = mEditor->getText().size() != 0;

    // compact mode: show a timestamp and name
    if (use_plain_text_chat_history)
    {
        square_brackets = chat.mSourceType == CHAT_SOURCE_SYSTEM;

        LLStyle::Params timestamp_style(body_message_params);

        // out of the timestamp
        if (args["show_time"].asBoolean() && !teleport_separator)
        {
            if (!message_from_log)
            {
                LLColor4 timestamp_color = LLUIColorTable::instance().getColor("ChatTimestampColor");
                timestamp_style.color(timestamp_color);
                timestamp_style.readonly_color(timestamp_color);
            }
            mEditor->appendText("[" + chat.mTimeStr + "] ", prependNewLineState, timestamp_style);
            prependNewLineState = false;
        }

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

        // names showing
        if (args["show_names_for_p2p_conv"].asBoolean() && utf8str_trim(chat.mFromName).size())
        {
            std::string script_prefix = is_lua ? LLTrans::getString("ScriptBy") : "";
            // 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())
            {
                // for object IMs, create a secondlife:///app/objectim SLapp
                std::string url = LLViewerChat::getSenderSLURL(chat, args);

                // 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);
                LLColor4 link_color = LLUIColorTable::instance().getColor("HTMLLinkColor");
                link_params.color = link_color;
                link_params.readonly_color = link_color;
                link_params.is_link = true;
                link_params.link_href = url;

                mEditor->appendText(chat.mFromName + delimiter, prependNewLineState, link_params);
                prependNewLineState = false;
            }
            else if ( chat.mFromName != SYSTEM_FROM && chat.mFromID.notNull() && !message_from_log && chat.mSourceType != CHAT_SOURCE_REGION)
            {
                LLStyle::Params link_params(body_message_params);
                link_params.overwriteFrom(LLStyleMap::instance().lookupAgent(chat.mFromID));

                // Add link to avatar's inspector and delimiter to message.
                mEditor->appendText(script_prefix + std::string(link_params.link_href) + delimiter,
                    prependNewLineState, link_params);
                prependNewLineState = false;
            }
            else if (teleport_separator)
            {
                std::string tp_text = LLTrans::getString("teleport_preamble_compact_chat");
                mEditor->appendText(tp_text + " <nolink>" + chat.mFromName + "</nolink>",
                    prependNewLineState, body_message_params);
                                prependNewLineState = false;
            }
            else
            {
                mEditor->appendText(script_prefix + "<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();
        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
            && mIsLastFromScript == is_lua)
        {
            view = getSeparator();
            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;
            }

            p.top_pad = mTopSeparatorPad;
            p.bottom_pad = mBottomSeparatorPad;
        }
        else
        {
            view = getHeader(chat, name_params, args, is_lua);
            if (!view)
            {
                LL_WARNS() << "Failed to create header from " << mMessageHeaderFilename << ": can't append to history" << LL_ENDL;
                return;
            }

            p.top_pad = mEditor->getLength() ? mTopHeaderPad : 0;
            p.bottom_pad = teleport_separator ? mBottomSeparatorPad : mBottomHeaderPad;
        }
        p.view = view;

        //Prepare the rect for the view
        LLRect target_rect = mEditor->getDocumentView()->getRect();
        // squeeze down the widget by subtracting padding off left and right
        target_rect.mLeft += mLeftWidgetPad + mEditor->getHPad();
        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[" + chat.mTimeStr + "] ";
        if (utf8str_trim(chat.mFromName).size() != 0 && chat.mFromName != SYSTEM_FROM)
            widget_associated_text += chat.mFromName + delimiter;

        mEditor->appendWidget(p, widget_associated_text, false);
        mLastFromName = chat.mFromName;
        mLastFromID = chat.mFromID;
        mLastMessageTime = new_message_time;
        mIsLastMessageFromLog = message_from_log;
        mIsLastFromScript = is_lua;
    }

    // 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& panel : LLToastNotifyPanel::instance_snapshot())
                {
                    LLIMToastNotifyPanel * imtoastp = dynamic_cast<LLIMToastNotifyPanel *>(&panel);
                    const std::string& notification_name = panel.getNotificationName();
                    if (notification_name == "OfferFriendship"
                        && panel.isControlPanelEnabled()
                        && imtoastp)
                    {
                        create_toast = false;
                        break;
                    }
                }
            }

            if (create_toast)
            {
                LLIMToastNotifyPanel* notify_box = new LLIMToastNotifyPanel(
                        notification, chat.mSessionID, LLRect::null, !use_plain_text_chat_history, mEditor);

                //Prepare the rect for the view
                LLRect target_rect = mEditor->getDocumentView()->getRect();
                // squeeze down the widget by subtracting padding off left and right
                target_rect.mLeft += mLeftWidgetPad + mEditor->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;
                mEditor->appendWidget(params, "\n", false);
            }
        }
    }
    // usual messages showing
    else if (!teleport_separator)
    {
        message = irc_me ? message.substr(3) : message;

        //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)
        {
            std::string from_name = chat.mFromName;
            LLAvatarName av_name;
            if (!chat.mFromID.isNull() &&
                        LLAvatarNameCache::get(chat.mFromID, &av_name) &&
                        !av_name.isDisplayNameDefault())
            {
                from_name = av_name.getCompleteName();
            }
            message = from_name + message;
        }

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

        mEditor->appendText(message, prependNewLineState, body_message_params);
        prependNewLineState = false;
    }

    mEditor->blockUndo();

    // automatically scroll to end when receiving chat from myself
    if (from_me)
    {
        mEditor->setCursorAndScrollToEnd();
    }
}

void LLChatHistory::draw()
{
    if (mEditor->scrolledToEnd())
    {
        mUnreadChatSources.clear();
        mMoreChatPanel->setVisible(false);
    }

    LLUICtrl::draw();
}