/**
 * @file llpanelpeople.cpp
 * @brief Side tray "People" panel
 *
 * $LicenseInfo:firstyear=2009&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

// libs
#include "llavatarname.h"
#include "llconversationview.h"
#include "llfloaterimcontainer.h"
#include "llfloaterreg.h"
#include "llfloatersidepanelcontainer.h"
#include "llmenubutton.h"
#include "llmenugl.h"
#include "llnotificationsutil.h"
#include "lleventtimer.h"
#include "llfiltereditor.h"
#include "lltabcontainer.h"
#include "lltoggleablemenu.h"
#include "lluictrlfactory.h"

#include "llpanelpeople.h"

// newview
#include "llaccordionctrl.h"
#include "llaccordionctrltab.h"
#include "llagent.h"
#include "llagentbenefits.h"
#include "llavataractions.h"
#include "llavatarlist.h"
#include "llavatarlistitem.h"
#include "llavatarnamecache.h"
#include "llcallingcard.h"          // for LLAvatarTracker
#include "llcallbacklist.h"
#include "llerror.h"
#include "llfloateravatarpicker.h"
#include "llfriendcard.h"
#include "llgroupactions.h"
#include "llgrouplist.h"
#include "llinventoryobserver.h"
#include "llnetmap.h"
#include "llpanelpeoplemenus.h"
#include "llparticipantlist.h"
#include "llsidetraypanelcontainer.h"
#include "llrecentpeople.h"
#include "llviewercontrol.h"        // for gSavedSettings
#include "llviewermenu.h"           // for gMenuHolder
#include "llviewerregion.h"
#include "llvoiceclient.h"
#include "llworld.h"
#include "llspeakers.h"
#include "llfloaterwebcontent.h"

#include "llagentui.h"
#include "llslurl.h"

#define FRIEND_LIST_UPDATE_TIMEOUT  0.5
#define NEARBY_LIST_UPDATE_INTERVAL 1

static const std::string NEARBY_TAB_NAME    = "nearby_panel";
static const std::string FRIENDS_TAB_NAME   = "friends_panel";
static const std::string GROUP_TAB_NAME     = "groups_panel";
static const std::string RECENT_TAB_NAME    = "recent_panel";
static const std::string BLOCKED_TAB_NAME   = "blocked_panel"; // blocked avatars
static const std::string COLLAPSED_BY_USER  = "collapsed_by_user";

/** Comparator for comparing avatar items by last interaction date */
class LLAvatarItemRecentComparator : public LLAvatarItemComparator
{
public:
    LLAvatarItemRecentComparator() {};
    virtual ~LLAvatarItemRecentComparator() {};

protected:
    virtual bool doCompare(const LLAvatarListItem* avatar_item1, const LLAvatarListItem* avatar_item2) const
    {
        LLRecentPeople& people = LLRecentPeople::instance();
        const LLDate& date1 = people.getDate(avatar_item1->getAvatarId());
        const LLDate& date2 = people.getDate(avatar_item2->getAvatarId());

        //older comes first
        return date1 > date2;
    }
};

/** Compares avatar items by online status, then by name */
class LLAvatarItemStatusComparator : public LLAvatarItemComparator
{
public:
    LLAvatarItemStatusComparator() {};

protected:
    /**
     * @return true if item1 < item2, false otherwise
     */
    virtual bool doCompare(const LLAvatarListItem* item1, const LLAvatarListItem* item2) const
    {
        LLAvatarTracker& at = LLAvatarTracker::instance();
        bool online1 = at.isBuddyOnline(item1->getAvatarId());
        bool online2 = at.isBuddyOnline(item2->getAvatarId());

        if (online1 == online2)
        {
            std::string name1 = item1->getAvatarName();
            std::string name2 = item2->getAvatarName();

            LLStringUtil::toUpper(name1);
            LLStringUtil::toUpper(name2);

            return name1 < name2;
        }

        return online1 > online2;
    }
};

/** Compares avatar items by distance between you and them */
class LLAvatarItemDistanceComparator : public LLAvatarItemComparator
{
public:
    typedef std::map < LLUUID, LLVector3d > id_to_pos_map_t;
    LLAvatarItemDistanceComparator() {};

    void updateAvatarsPositions(std::vector<LLVector3d>& positions, uuid_vec_t& uuids)
    {
        std::vector<LLVector3d>::const_iterator
            pos_it = positions.begin(),
            pos_end = positions.end();

        uuid_vec_t::const_iterator
            id_it = uuids.begin(),
            id_end = uuids.end();

        mAvatarsPositions.clear();

        for (;pos_it != pos_end && id_it != id_end; ++pos_it, ++id_it )
        {
            mAvatarsPositions[*id_it] = *pos_it;
        }
    };

protected:
    virtual bool doCompare(const LLAvatarListItem* item1, const LLAvatarListItem* item2) const
    {
        const LLVector3d& me_pos = gAgent.getPositionGlobal();
        const LLVector3d& item1_pos = mAvatarsPositions.find(item1->getAvatarId())->second;
        const LLVector3d& item2_pos = mAvatarsPositions.find(item2->getAvatarId())->second;

        return dist_vec_squared(item1_pos, me_pos) < dist_vec_squared(item2_pos, me_pos);
    }
private:
    id_to_pos_map_t mAvatarsPositions;
};

/** Comparator for comparing nearby avatar items by last spoken time */
class LLAvatarItemRecentSpeakerComparator : public  LLAvatarItemNameComparator
{
public:
    LLAvatarItemRecentSpeakerComparator() {};
    virtual ~LLAvatarItemRecentSpeakerComparator() {};

protected:
    virtual bool doCompare(const LLAvatarListItem* item1, const LLAvatarListItem* item2) const
    {
        LLPointer<LLSpeaker> lhs = LLActiveSpeakerMgr::instance().findSpeaker(item1->getAvatarId());
        LLPointer<LLSpeaker> rhs = LLActiveSpeakerMgr::instance().findSpeaker(item2->getAvatarId());
        if ( lhs.notNull() && rhs.notNull() )
        {
            // Compare by last speaking time
            if( lhs->mLastSpokeTime != rhs->mLastSpokeTime )
                return ( lhs->mLastSpokeTime > rhs->mLastSpokeTime );
        }
        else if ( lhs.notNull() )
        {
            // True if only item1 speaker info available
            return true;
        }
        else if ( rhs.notNull() )
        {
            // False if only item2 speaker info available
            return false;
        }
        // By default compare by name.
        return LLAvatarItemNameComparator::doCompare(item1, item2);
    }
};

class LLAvatarItemRecentArrivalComparator : public  LLAvatarItemNameComparator
{
public:
    LLAvatarItemRecentArrivalComparator() {};
    virtual ~LLAvatarItemRecentArrivalComparator() {};

protected:
    virtual bool doCompare(const LLAvatarListItem* item1, const LLAvatarListItem* item2) const
    {

        F32 arr_time1 = LLRecentPeople::instance().getArrivalTimeByID(item1->getAvatarId());
        F32 arr_time2 = LLRecentPeople::instance().getArrivalTimeByID(item2->getAvatarId());

        if (arr_time1 == arr_time2)
        {
            std::string name1 = item1->getAvatarName();
            std::string name2 = item2->getAvatarName();

            LLStringUtil::toUpper(name1);
            LLStringUtil::toUpper(name2);

            return name1 < name2;
        }

        return arr_time1 > arr_time2;
    }
};

static const LLAvatarItemRecentComparator RECENT_COMPARATOR;
static const LLAvatarItemStatusComparator STATUS_COMPARATOR;
static LLAvatarItemDistanceComparator DISTANCE_COMPARATOR;
static const LLAvatarItemRecentSpeakerComparator RECENT_SPEAKER_COMPARATOR;
static LLAvatarItemRecentArrivalComparator RECENT_ARRIVAL_COMPARATOR;

static LLPanelInjector<LLPanelPeople> t_people("panel_people");

//=============================================================================

/**
 * Updates given list either on regular basis or on external events (up to implementation).
 */
class LLPanelPeople::Updater
{
public:
    typedef boost::function<void()> callback_t;
    Updater(callback_t cb)
    : mCallback(cb)
    {
    }

    virtual ~Updater()
    {
    }

    /**
     * Activate/deactivate updater.
     *
     * This may start/stop regular updates.
     */
    virtual void setActive(bool) {}

protected:
    void update()
    {
        mCallback();
    }

    callback_t      mCallback;
};

/**
 * Update buttons on changes in our friend relations (STORM-557).
 */
class LLButtonsUpdater : public LLPanelPeople::Updater, public LLFriendObserver
{
public:
    LLButtonsUpdater(callback_t cb)
    :   LLPanelPeople::Updater(cb)
    {
        LLAvatarTracker::instance().addObserver(this);
    }

    ~LLButtonsUpdater()
    {
        LLAvatarTracker::instance().removeObserver(this);
    }

    /*virtual*/ void changed(U32 mask)
    {
        (void) mask;
        update();
    }
};

class LLAvatarListUpdater : public LLPanelPeople::Updater, public LLEventTimer
{
public:
    LLAvatarListUpdater(callback_t cb, F32 period)
    :   LLEventTimer(period),
        LLPanelPeople::Updater(cb)
    {
        mEventTimer.stop();
    }

    virtual bool tick() // from LLEventTimer
    {
        return false;
    }
};

/**
 * Updates the friends list.
 *
 * Updates the list on external events which trigger the changed() method.
 */
class LLFriendListUpdater : public LLAvatarListUpdater, public LLFriendObserver
{
    LOG_CLASS(LLFriendListUpdater);
    class LLInventoryFriendCardObserver;

public:
    friend class LLInventoryFriendCardObserver;
    LLFriendListUpdater(callback_t cb)
    :   LLAvatarListUpdater(cb, FRIEND_LIST_UPDATE_TIMEOUT)
    ,   mIsActive(false)
    {
        LLAvatarTracker::instance().addObserver(this);

        // For notification when SIP online status changes.
        LLVoiceClient::addObserver(this);
        mInvObserver = new LLInventoryFriendCardObserver(this);
    }

    ~LLFriendListUpdater()
    {
        // will be deleted by ~LLInventoryModel
        //delete mInvObserver;
        LLVoiceClient::removeObserver(this);
        LLAvatarTracker::instance().removeObserver(this);
    }

    /*virtual*/ void changed(U32 mask)
    {
        if (mIsActive)
        {
            // events can arrive quickly in bulk - we need not process EVERY one of them -
            // so we wait a short while to let others pile-in, and process them in aggregate.
            mEventTimer.start();
        }

        // save-up all the mask-bits which have come-in
        mMask |= mask;
    }


    /*virtual*/ bool tick()
    {
        if (!mIsActive) return false;

        if (mMask & (LLFriendObserver::ADD | LLFriendObserver::REMOVE | LLFriendObserver::ONLINE))
        {
            update();
        }

        // Stop updates.
        mEventTimer.stop();
        mMask = 0;

        return false;
    }

    // virtual
    void setActive(bool active)
    {
        mIsActive = active;
        if (active)
        {
            tick();
        }
    }

private:
    U32 mMask;
    LLInventoryFriendCardObserver* mInvObserver;
    bool mIsActive;

    /**
     *  This class is intended for updating Friend List when Inventory Friend Card is added/removed.
     *
     *  The main usage is when Inventory Friends/All content is added while synchronizing with
     *      friends list on startup is performed. In this case Friend Panel should be updated when
     *      missing Inventory Friend Card is created.
     *  *NOTE: updating is fired when Inventory item is added into CallingCards/Friends subfolder.
     *      Otherwise LLFriendObserver functionality is enough to keep Friends Panel synchronized.
     */
    class LLInventoryFriendCardObserver : public LLInventoryObserver
    {
        LOG_CLASS(LLFriendListUpdater::LLInventoryFriendCardObserver);

        friend class LLFriendListUpdater;

    private:
        LLInventoryFriendCardObserver(LLFriendListUpdater* updater) : mUpdater(updater)
        {
            gInventory.addObserver(this);
        }
        ~LLInventoryFriendCardObserver()
        {
            gInventory.removeObserver(this);
        }
        /*virtual*/ void changed(U32 mask)
        {
            LL_DEBUGS() << "Inventory changed: " << mask << LL_ENDL;

            static bool synchronize_friends_folders = true;
            if (synchronize_friends_folders)
            {
                // Checks whether "Friends" and "Friends/All" folders exist in "Calling Cards" folder,
                // fetches their contents if needed and synchronizes it with buddies list.
                // If the folders are not found they are created.
                LLFriendCardsManager::instance().syncFriendCardsFolders();
                synchronize_friends_folders = false;
            }

            // *NOTE: deleting of InventoryItem is performed via moving to Trash.
            // That means LLInventoryObserver::STRUCTURE is present in MASK instead of LLInventoryObserver::REMOVE
            if ((CALLINGCARD_ADDED & mask) == CALLINGCARD_ADDED)
            {
                LL_DEBUGS() << "Calling card added: count: " << gInventory.getChangedIDs().size()
                    << ", first Inventory ID: "<< (*gInventory.getChangedIDs().begin())
                    << LL_ENDL;

                bool friendFound = false;
                std::set<LLUUID> changedIDs = gInventory.getChangedIDs();
                for (std::set<LLUUID>::const_iterator it = changedIDs.begin(); it != changedIDs.end(); ++it)
                {
                    if (isDescendentOfInventoryFriends(*it))
                    {
                        friendFound = true;
                        break;
                    }
                }

                if (friendFound)
                {
                    LL_DEBUGS() << "friend found, panel should be updated" << LL_ENDL;
                    mUpdater->changed(LLFriendObserver::ADD);
                }
            }
        }

        bool isDescendentOfInventoryFriends(const LLUUID& invItemID)
        {
            LLViewerInventoryItem * item = gInventory.getItem(invItemID);
            if (NULL == item)
                return false;

            return LLFriendCardsManager::instance().isItemInAnyFriendsList(item);
        }
        LLFriendListUpdater* mUpdater;

        static const U32 CALLINGCARD_ADDED = LLInventoryObserver::ADD | LLInventoryObserver::CALLING_CARD;
    };
};

/**
 * Periodically updates the nearby people list while the Nearby tab is active.
 *
 * The period is defined by NEARBY_LIST_UPDATE_INTERVAL constant.
 */
class LLNearbyListUpdater : public LLAvatarListUpdater
{
    LOG_CLASS(LLNearbyListUpdater);

public:
    LLNearbyListUpdater(callback_t cb)
    :   LLAvatarListUpdater(cb, NEARBY_LIST_UPDATE_INTERVAL)
    {
        setActive(false);
    }

    /*virtual*/ void setActive(bool val)
    {
        if (val)
        {
            // update immediately and start regular updates
            update();
            mEventTimer.start();
        }
        else
        {
            // stop regular updates
            mEventTimer.stop();
        }
    }

    /*virtual*/ bool tick()
    {
        update();
        return false;
    }
private:
};

/**
 * Updates the recent people list (those the agent has recently interacted with).
 */
class LLRecentListUpdater : public LLAvatarListUpdater, public boost::signals2::trackable
{
    LOG_CLASS(LLRecentListUpdater);

public:
    LLRecentListUpdater(callback_t cb)
    :   LLAvatarListUpdater(cb, 0)
    {
        LLRecentPeople::instance().setChangedCallback(boost::bind(&LLRecentListUpdater::update, this));
    }
};

//=============================================================================

LLPanelPeople::LLPanelPeople()
    :   LLPanel(),
        mTabContainer(NULL),
        mOnlineFriendList(NULL),
        mAllFriendList(NULL),
        mNearbyList(NULL),
        mRecentList(NULL),
        mGroupList(NULL),
        mMiniMap(NULL)
{
    mFriendListUpdater = new LLFriendListUpdater(boost::bind(&LLPanelPeople::updateFriendList,  this));
    mNearbyListUpdater = new LLNearbyListUpdater(boost::bind(&LLPanelPeople::updateNearbyList,  this));
    mRecentListUpdater = new LLRecentListUpdater(boost::bind(&LLPanelPeople::updateRecentList,  this));
    mButtonsUpdater = new LLButtonsUpdater(boost::bind(&LLPanelPeople::updateButtons, this));

    mCommitCallbackRegistrar.add("People.AddFriend", boost::bind(&LLPanelPeople::onAddFriendButtonClicked, this));
    mCommitCallbackRegistrar.add("People.AddFriendWizard",  boost::bind(&LLPanelPeople::onAddFriendWizButtonClicked,    this));
    mCommitCallbackRegistrar.add("People.DelFriend",        boost::bind(&LLPanelPeople::onDeleteFriendButtonClicked,    this));
    mCommitCallbackRegistrar.add("People.Group.Minus",      boost::bind(&LLPanelPeople::onGroupMinusButtonClicked,  this));
    mCommitCallbackRegistrar.add("People.Chat",         boost::bind(&LLPanelPeople::onChatButtonClicked,        this));
    mCommitCallbackRegistrar.add("People.Gear",         boost::bind(&LLPanelPeople::onGearButtonClicked,        this, _1));

    mCommitCallbackRegistrar.add("People.Group.Plus.Action",  boost::bind(&LLPanelPeople::onGroupPlusMenuItemClicked,  this, _2));
    mCommitCallbackRegistrar.add("People.Friends.ViewSort.Action",  boost::bind(&LLPanelPeople::onFriendsViewSortMenuItemClicked,  this, _2));
    mCommitCallbackRegistrar.add("People.Nearby.ViewSort.Action",  boost::bind(&LLPanelPeople::onNearbyViewSortMenuItemClicked,  this, _2));
    mCommitCallbackRegistrar.add("People.Groups.ViewSort.Action",  boost::bind(&LLPanelPeople::onGroupsViewSortMenuItemClicked,  this, _2));
    mCommitCallbackRegistrar.add("People.Recent.ViewSort.Action",  boost::bind(&LLPanelPeople::onRecentViewSortMenuItemClicked,  this, _2));

    mEnableCallbackRegistrar.add("People.Friends.ViewSort.CheckItem",   boost::bind(&LLPanelPeople::onFriendsViewSortMenuItemCheck, this, _2));
    mEnableCallbackRegistrar.add("People.Recent.ViewSort.CheckItem",    boost::bind(&LLPanelPeople::onRecentViewSortMenuItemCheck,  this, _2));
    mEnableCallbackRegistrar.add("People.Nearby.ViewSort.CheckItem",    boost::bind(&LLPanelPeople::onNearbyViewSortMenuItemCheck,  this, _2));

    mEnableCallbackRegistrar.add("People.Group.Plus.Validate",  boost::bind(&LLPanelPeople::onGroupPlusButtonValidate,  this));

    doPeriodically(boost::bind(&LLPanelPeople::updateNearbyArrivalTime, this), 2.0);
}

LLPanelPeople::~LLPanelPeople()
{
    delete mButtonsUpdater;
    delete mNearbyListUpdater;
    delete mFriendListUpdater;
    delete mRecentListUpdater;

    LLVoiceClient::removeObserver(this);

    mNearbyFilterCommitConnection.disconnect();
    mFriedsFilterCommitConnection.disconnect();
    mGroupsFilterCommitConnection.disconnect();
    mRecentFilterCommitConnection.disconnect();

}

void LLPanelPeople::onFriendsAccordionExpandedCollapsed(LLUICtrl* ctrl, const LLSD& param, LLAvatarList* avatar_list)
{
    if(!avatar_list)
    {
        LL_ERRS() << "Bad parameter" << LL_ENDL;
        return;
    }

    bool expanded = param.asBoolean();

    setAccordionCollapsedByUser(ctrl, !expanded);
    if(!expanded)
    {
        avatar_list->resetSelection();
    }
}


void LLPanelPeople::removePicker()
{
    if(mPicker.get())
    {
        mPicker.get()->closeFloater();
    }
}

bool LLPanelPeople::postBuild()
{
    S32 max_premium = LLAgentBenefitsMgr::get("Premium").getGroupMembershipLimit();

    LLPanel* group_tab = getChild<LLPanel>(GROUP_TAB_NAME);
    mGroupDelBtn = group_tab->getChild<LLButton>("minus_btn");
    mGroupCountText = group_tab->getChild<LLTextBox>("groupcount");
    if(LLAgentBenefitsMgr::current().getGroupMembershipLimit() < max_premium)
    {
        mGroupCountText->setText(getString("GroupCountWithInfo"));
        mGroupCountText->setURLClickedCallback(boost::bind(&LLPanelPeople::onGroupLimitInfo, this));
    }

    mTabContainer = getChild<LLTabContainer>("tabs");
    mTabContainer->setCommitCallback(boost::bind(&LLPanelPeople::onTabSelected, this, _2));
    mSavedFilters.resize(mTabContainer->getTabCount());
    mSavedOriginalFilters.resize(mTabContainer->getTabCount());

    LLPanel* friends_tab = getChild<LLPanel>(FRIENDS_TAB_NAME);
    // updater is active only if panel is visible to user.
    friends_tab->setVisibleCallback(boost::bind(&Updater::setActive, mFriendListUpdater, _2));
    friends_tab->setVisibleCallback(boost::bind(&LLPanelPeople::removePicker, this));

    mFriendsGearBtn = friends_tab->getChild<LLButton>("gear_btn");
    mFriendsDelFriendBtn = friends_tab->getChild<LLUICtrl>("friends_del_btn");

    mOnlineFriendList = friends_tab->getChild<LLAvatarList>("avatars_online");
    mAllFriendList = friends_tab->getChild<LLAvatarList>("avatars_all");
    mOnlineFriendList->setNoItemsCommentText(getString("no_friends_online"));
    mOnlineFriendList->setShowIcons("FriendsListShowIcons");
    mOnlineFriendList->showPermissions(gSavedSettings.getBOOL("FriendsListShowPermissions"));
    mOnlineFriendList->setShowCompleteName(!gSavedSettings.getBOOL("FriendsListHideUsernames"));
    mAllFriendList->setNoItemsCommentText(getString("no_friends"));
    mAllFriendList->setShowIcons("FriendsListShowIcons");
    mAllFriendList->showPermissions(gSavedSettings.getBOOL("FriendsListShowPermissions"));
    mAllFriendList->setShowCompleteName(!gSavedSettings.getBOOL("FriendsListHideUsernames"));

    LLPanel* nearby_tab = getChild<LLPanel>(NEARBY_TAB_NAME);
    nearby_tab->setVisibleCallback(boost::bind(&Updater::setActive, mNearbyListUpdater, _2));

    mNearbyList = nearby_tab->getChild<LLAvatarList>("avatar_list");
    mNearbyList->setNoItemsCommentText(getString("no_one_near"));
    mNearbyList->setNoItemsMsg(getString("no_one_near"));
    mNearbyList->setNoFilteredItemsMsg(getString("no_one_filtered_near"));
    mNearbyList->setShowIcons("NearbyListShowIcons");
    mNearbyList->setShowCompleteName(!gSavedSettings.getBOOL("NearbyListHideUsernames"));
    mMiniMap = nearby_tab->getChild<LLNetMap>("Net Map", true);
    mMiniMap->setToolTipMsg(gSavedSettings.getBOOL("DoubleClickTeleport") ?
        getString("AltMiniMapToolTipMsg") : getString("MiniMapToolTipMsg"));

    mNearbyGearBtn = nearby_tab->getChild<LLButton>("gear_btn");
    mNearbyAddFriendBtn = nearby_tab->getChild<LLButton>("add_friend_btn");

    LLPanel* recent_tab = getChild<LLPanel>(RECENT_TAB_NAME);
    mRecentList = recent_tab->getChild<LLAvatarList>("avatar_list");
    mRecentList->setNoItemsCommentText(getString("no_recent_people"));
    mRecentList->setNoItemsMsg(getString("no_recent_people"));
    mRecentList->setNoFilteredItemsMsg(getString("no_filtered_recent_people"));
    mRecentList->setShowIcons("RecentListShowIcons");

    mRecentGearBtn = recent_tab->getChild<LLButton>("gear_btn");
    mRecentAddFriendBtn = recent_tab->getChild<LLButton>("add_friend_btn");

    mGroupList = group_tab->getChild<LLGroupList>("group_list");
    mGroupList->setNoItemsCommentText(getString("no_groups_msg"));
    mGroupList->setNoItemsMsg(getString("no_groups_msg"));
    mGroupList->setNoFilteredItemsMsg(getString("no_filtered_groups_msg"));

    mNearbyFilterCommitConnection = nearby_tab->getChild<LLFilterEditor>("nearby_filter_input")->setCommitCallback(boost::bind(&LLPanelPeople::onFilterEdit, this, _2));
    mFriedsFilterCommitConnection = friends_tab->getChild<LLFilterEditor>("friends_filter_input")->setCommitCallback(boost::bind(&LLPanelPeople::onFilterEdit, this, _2));
    mRecentFilterCommitConnection = recent_tab->getChild<LLFilterEditor>("recent_filter_input")->setCommitCallback(boost::bind(&LLPanelPeople::onFilterEdit, this, _2));
    mGroupsFilterCommitConnection = group_tab->getChild<LLFilterEditor>("groups_filter_input")->setCommitCallback(boost::bind(&LLPanelPeople::onFilterEdit, this, _2));

    mNearbyList->setContextMenu(&LLPanelPeopleMenus::gNearbyPeopleContextMenu);
    mRecentList->setContextMenu(&LLPanelPeopleMenus::gPeopleContextMenu);
    mAllFriendList->setContextMenu(&LLPanelPeopleMenus::gPeopleContextMenu);
    mOnlineFriendList->setContextMenu(&LLPanelPeopleMenus::gPeopleContextMenu);

    setSortOrder(mRecentList,       (ESortOrder)gSavedSettings.getU32("RecentPeopleSortOrder"), false);
    setSortOrder(mAllFriendList,    (ESortOrder)gSavedSettings.getU32("FriendsSortOrder"),      false);
    setSortOrder(mNearbyList,       (ESortOrder)gSavedSettings.getU32("NearbyPeopleSortOrder"), false);

    mOnlineFriendList->setItemDoubleClickCallback(boost::bind(&LLPanelPeople::onAvatarListDoubleClicked, this, _1));
    mAllFriendList->setItemDoubleClickCallback(boost::bind(&LLPanelPeople::onAvatarListDoubleClicked, this, _1));
    mNearbyList->setItemDoubleClickCallback(boost::bind(&LLPanelPeople::onAvatarListDoubleClicked, this, _1));
    mRecentList->setItemDoubleClickCallback(boost::bind(&LLPanelPeople::onAvatarListDoubleClicked, this, _1));

    mOnlineFriendList->setCommitCallback(boost::bind(&LLPanelPeople::onAvatarListCommitted, this, mOnlineFriendList));
    mAllFriendList->setCommitCallback(boost::bind(&LLPanelPeople::onAvatarListCommitted, this, mAllFriendList));
    mNearbyList->setCommitCallback(boost::bind(&LLPanelPeople::onAvatarListCommitted, this, mNearbyList));
    mRecentList->setCommitCallback(boost::bind(&LLPanelPeople::onAvatarListCommitted, this, mRecentList));

    // Set openning IM as default on return action for avatar lists
    mOnlineFriendList->setReturnCallback(boost::bind(&LLPanelPeople::onImButtonClicked, this));
    mAllFriendList->setReturnCallback(boost::bind(&LLPanelPeople::onImButtonClicked, this));
    mNearbyList->setReturnCallback(boost::bind(&LLPanelPeople::onImButtonClicked, this));
    mRecentList->setReturnCallback(boost::bind(&LLPanelPeople::onImButtonClicked, this));

    mGroupList->setDoubleClickCallback(boost::bind(&LLPanelPeople::onChatButtonClicked, this));
    mGroupList->setCommitCallback(boost::bind(&LLPanelPeople::updateButtons, this));
    mGroupList->setReturnCallback(boost::bind(&LLPanelPeople::onChatButtonClicked, this));

    LLMenuButton* groups_gear_btn = getChild<LLMenuButton>("groups_gear_btn");

    // Use the context menu of the Groups list for the Groups tab gear menu.
    LLToggleableMenu* groups_gear_menu = mGroupList->getContextMenu();
    if (groups_gear_menu)
    {
        groups_gear_btn->setMenu(groups_gear_menu, LLMenuButton::MP_BOTTOM_LEFT);
    }
    else
    {
        LL_WARNS() << "People->Groups list menu not found" << LL_ENDL;
    }

    mFriendsAccordion = friends_tab->getChild<LLAccordionCtrl>("friends_accordion");

    mFriendsAllTab = mFriendsAccordion->getChild<LLAccordionCtrlTab>("tab_all");
    mFriendsAllTab->setDropDownStateChangedCallback(
        boost::bind(&LLPanelPeople::onFriendsAccordionExpandedCollapsed, this, _1, _2, mAllFriendList));

    mFriendsOnlineTab = mFriendsAccordion->getChild<LLAccordionCtrlTab>("tab_online");
    mFriendsOnlineTab->setDropDownStateChangedCallback(
        boost::bind(&LLPanelPeople::onFriendsAccordionExpandedCollapsed, this, _1, _2, mOnlineFriendList));

    // Must go after setting commit callback and initializing all pointers to children.
    mTabContainer->selectTabByName(NEARBY_TAB_NAME);

    LLVoiceClient::addObserver(this);

    // call this method in case some list is empty and buttons can be in inconsistent state
    updateButtons();

    mOnlineFriendList->setRefreshCompleteCallback(boost::bind(&LLPanelPeople::onFriendListRefreshComplete, this, _1, _2));
    mAllFriendList->setRefreshCompleteCallback(boost::bind(&LLPanelPeople::onFriendListRefreshComplete, this, _1, _2));

    return true;
}

// virtual
void LLPanelPeople::onChange(EStatusType status, const LLSD& channelInfo, bool proximal)
{
    if(status == STATUS_JOINING || status == STATUS_LEFT_CHANNEL)
    {
        return;
    }

    updateButtons();
}

void LLPanelPeople::updateFriendListHelpText()
{
    // show special help text for just created account to help finding friends. EXT-4836
    static LLTextBox* no_friends_text = getChild<LLTextBox>("no_friends_help_text");

    // Seems sometimes all_friends can be empty because of issue with Inventory loading (clear cache, slow connection...)
    // So, lets check all lists to avoid overlapping the text with online list. See EXT-6448.
    bool any_friend_exists = mAllFriendList->filterHasMatches() || mOnlineFriendList->filterHasMatches();
    no_friends_text->setVisible(!any_friend_exists);
    if (no_friends_text->getVisible())
    {
        //update help text for empty lists
        const std::string& filter = mSavedOriginalFilters[mTabContainer->getCurrentPanelIndex()];

        std::string message_name = filter.empty() ? "no_friends_msg" : "no_filtered_friends_msg";
        LLStringUtil::format_map_t args;
        args["[SEARCH_TERM]"] = LLURI::escape(filter);
        no_friends_text->setText(getString(message_name, args));
    }
}

void LLPanelPeople::updateFriendList()
{
    if (!mOnlineFriendList || !mAllFriendList)
        return;

    // get all buddies we know about
    const LLAvatarTracker& av_tracker = LLAvatarTracker::instance();
    LLAvatarTracker::buddy_map_t all_buddies;
    av_tracker.copyBuddyList(all_buddies);

    // save them to the online and all friends vectors
    uuid_vec_t& online_friendsp = mOnlineFriendList->getIDs();
    uuid_vec_t& all_friendsp = mAllFriendList->getIDs();

    all_friendsp.clear();
    online_friendsp.clear();

    uuid_vec_t buddies_uuids;
    LLAvatarTracker::buddy_map_t::const_iterator buddies_iter;

    // Fill the avatar list with friends UUIDs
    for (buddies_iter = all_buddies.begin(); buddies_iter != all_buddies.end(); ++buddies_iter)
    {
        buddies_uuids.push_back(buddies_iter->first);
    }

    if (buddies_uuids.size() > 0)
    {
        LL_DEBUGS() << "Friends added to the list: " << buddies_uuids.size() << LL_ENDL;
        all_friendsp = buddies_uuids;
    }
    else
    {
        LL_DEBUGS() << "No friends found" << LL_ENDL;
    }

    LLAvatarTracker::buddy_map_t::const_iterator buddy_it = all_buddies.begin();
    for (; buddy_it != all_buddies.end(); ++buddy_it)
    {
        LLUUID buddy_id = buddy_it->first;
        if (av_tracker.isBuddyOnline(buddy_id))
            online_friendsp.push_back(buddy_id);
    }

    /*
     * Avatarlists  will be hidden by showFriendsAccordionsIfNeeded(), if they do not have items.
     * But avatarlist can be updated only if it is visible @see LLAvatarList::draw();
     * So we need to do force update of lists to avoid inconsistency of data and view of avatarlist.
     */
    mOnlineFriendList->setDirty(true, !mOnlineFriendList->filterHasMatches());// do force update if list do NOT have items
    mAllFriendList->setDirty(true, !mAllFriendList->filterHasMatches());
    //update trash and other buttons according to a selected item
    updateButtons();
    showFriendsAccordionsIfNeeded();
}

void LLPanelPeople::updateNearbyList()
{
    if (!mNearbyList)
        return;

    std::vector<LLVector3d> positions;

    LLWorld::getInstance()->getAvatars(&mNearbyList->getIDs(), &positions, gAgent.getPositionGlobal(), gSavedSettings.getF32("MPVNearMeRange"));
    mNearbyList->setDirty();

    DISTANCE_COMPARATOR.updateAvatarsPositions(positions, mNearbyList->getIDs());
    LLActiveSpeakerMgr::instance().update(true);
}

void LLPanelPeople::updateRecentList()
{
    if (!mRecentList)
        return;

    LLRecentPeople::instance().get(mRecentList->getIDs());
    mRecentList->setDirty();
}

void LLPanelPeople::updateButtons()
{
    const std::string& cur_tab     = getActiveTabName();
    bool nearby_tab_active = (cur_tab == NEARBY_TAB_NAME);
    bool friends_tab_active = (cur_tab == FRIENDS_TAB_NAME);
    bool group_tab_active   = (cur_tab == GROUP_TAB_NAME);
    bool recent_tab_active  = (cur_tab == RECENT_TAB_NAME);
    LLUUID selected_id;

    uuid_vec_t selected_uuids;
    getCurrentItemIDs(selected_uuids);
    bool item_selected = (selected_uuids.size() == 1);
    bool multiple_selected = (selected_uuids.size() >= 1);

    if (group_tab_active)
    {
        if (item_selected)
        {
            selected_id = mGroupList->getSelectedUUID();
        }

        mGroupDelBtn->setEnabled(item_selected && selected_id.notNull()); // a real group selected

        U32 groups_count = static_cast<U32>(gAgent.mGroups.size());
        U32 max_groups = LLAgentBenefitsMgr::current().getGroupMembershipLimit();
        U32 groups_remaining = max_groups > groups_count ? max_groups - groups_count : 0;
        mGroupCountText->setTextArg("[COUNT]", llformat("%d", groups_count));
        mGroupCountText->setTextArg("[REMAINING]", llformat("%d", groups_remaining));
    }
    else
    {
        bool is_friend = true;
        bool is_self = false;
        // Check whether selected avatar is our friend.
        if (item_selected)
        {
            selected_id = selected_uuids.front();
            is_friend = LLAvatarTracker::instance().getBuddyInfo(selected_id) != NULL;
            is_self = gAgent.getID() == selected_id;
        }

        {
            if(nearby_tab_active)
            {
                mNearbyAddFriendBtn->setEnabled(item_selected && !is_friend && !is_self);
                mNearbyGearBtn->setEnabled(multiple_selected);
            }

            if (friends_tab_active)
            {
                mFriendsDelFriendBtn->setEnabled(multiple_selected);
                mFriendsGearBtn->setEnabled(multiple_selected);
            }

            if (recent_tab_active)
            {
                mRecentAddFriendBtn->setEnabled(item_selected && !is_friend && !is_self);
                mRecentGearBtn->setEnabled(multiple_selected);
            }
        }
    }
}

const std::string& LLPanelPeople::getActiveTabName() const
{
    return mTabContainer->getCurrentPanel()->getName();
}

LLUUID LLPanelPeople::getCurrentItemID() const
{
    const std::string& cur_tab = getActiveTabName();

    if (cur_tab == FRIENDS_TAB_NAME) // this tab has two lists
    {
        LLUUID cur_online_friend;

        if ((cur_online_friend = mOnlineFriendList->getSelectedUUID()).notNull())
            return cur_online_friend;

        return mAllFriendList->getSelectedUUID();
    }

    if (cur_tab == NEARBY_TAB_NAME)
        return mNearbyList->getSelectedUUID();

    if (cur_tab == RECENT_TAB_NAME)
        return mRecentList->getSelectedUUID();

    if (cur_tab == GROUP_TAB_NAME)
        return mGroupList->getSelectedUUID();

    if (cur_tab == BLOCKED_TAB_NAME)
        return LLUUID::null; // FIXME?

    llassert(0 && "unknown tab selected");
    return LLUUID::null;
}

void LLPanelPeople::getCurrentItemIDs(uuid_vec_t& selected_uuids) const
{
    const std::string& cur_tab = getActiveTabName();

    if (cur_tab == FRIENDS_TAB_NAME)
    {
        // friends tab has two lists
        mOnlineFriendList->getSelectedUUIDs(selected_uuids);
        mAllFriendList->getSelectedUUIDs(selected_uuids);
    }
    else if (cur_tab == NEARBY_TAB_NAME)
        mNearbyList->getSelectedUUIDs(selected_uuids);
    else if (cur_tab == RECENT_TAB_NAME)
        mRecentList->getSelectedUUIDs(selected_uuids);
    else if (cur_tab == GROUP_TAB_NAME)
        mGroupList->getSelectedUUIDs(selected_uuids);
    else if (cur_tab == BLOCKED_TAB_NAME)
        selected_uuids.clear(); // FIXME?
    else
        llassert(0 && "unknown tab selected");

}

void LLPanelPeople::setSortOrder(LLAvatarList* list, ESortOrder order, bool save)
{
    switch (order)
    {
    case E_SORT_BY_NAME:
        list->sortByName();
        break;
    case E_SORT_BY_STATUS:
        list->setComparator(&STATUS_COMPARATOR);
        list->sort();
        break;
    case E_SORT_BY_MOST_RECENT:
        list->setComparator(&RECENT_COMPARATOR);
        list->sort();
        break;
    case E_SORT_BY_RECENT_SPEAKERS:
        list->setComparator(&RECENT_SPEAKER_COMPARATOR);
        list->sort();
        break;
    case E_SORT_BY_DISTANCE:
        list->setComparator(&DISTANCE_COMPARATOR);
        list->sort();
        break;
    case E_SORT_BY_RECENT_ARRIVAL:
        list->setComparator(&RECENT_ARRIVAL_COMPARATOR);
        list->sort();
        break;
    default:
        LL_WARNS() << "Unrecognized people sort order for " << list->getName() << LL_ENDL;
        return;
    }

    if (save)
    {
        std::string setting;

        if (list == mAllFriendList || list == mOnlineFriendList)
            setting = "FriendsSortOrder";
        else if (list == mRecentList)
            setting = "RecentPeopleSortOrder";
        else if (list == mNearbyList)
            setting = "NearbyPeopleSortOrder";

        if (!setting.empty())
            gSavedSettings.setU32(setting, order);
    }
}

void LLPanelPeople::onFilterEdit(const std::string& search_string)
{
    const S32 cur_tab_idx = mTabContainer->getCurrentPanelIndex();
    std::string& filter = mSavedOriginalFilters[cur_tab_idx];
    std::string& saved_filter = mSavedFilters[cur_tab_idx];

    filter = search_string;
    LLStringUtil::trimHead(filter);

    // Searches are case-insensitive
    std::string search_upper = filter;
    LLStringUtil::toUpper(search_upper);

    if (saved_filter == search_upper)
        return;

    saved_filter = search_upper;

    // Apply new filter to the current tab.
    const std::string& cur_tab = getActiveTabName();
    if (cur_tab == NEARBY_TAB_NAME)
    {
        mNearbyList->setNameFilter(filter);
    }
    else if (cur_tab == FRIENDS_TAB_NAME)
    {
        // store accordion tabs opened/closed state before any manipulation with accordion tabs
        if (!saved_filter.empty())
        {
            notifyChildren(LLSD().with("action","store_state"));
        }

        mOnlineFriendList->setNameFilter(filter);
        mAllFriendList->setNameFilter(filter);

        setAccordionCollapsedByUser(mFriendsOnlineTab, false);
        setAccordionCollapsedByUser(mFriendsAllTab, false);
        showFriendsAccordionsIfNeeded();

        // restore accordion tabs state _after_ all manipulations
        if(saved_filter.empty())
        {
            notifyChildren(LLSD().with("action","restore_state"));
        }
    }
    else if (cur_tab == GROUP_TAB_NAME)
    {
        mGroupList->setNameFilter(filter);
    }
    else if (cur_tab == RECENT_TAB_NAME)
    {
        mRecentList->setNameFilter(filter);
    }
}

void LLPanelPeople::onGroupLimitInfo()
{
    LLSD args;

    S32 max_basic = LLAgentBenefitsMgr::get("Base").getGroupMembershipLimit();
    S32 max_premium = LLAgentBenefitsMgr::get("Premium").getGroupMembershipLimit();

    args["MAX_BASIC"] = max_basic;
    args["MAX_PREMIUM"] = max_premium;

    if (LLAgentBenefitsMgr::has("Premium_Plus"))
    {
        S32 max_premium_plus = LLAgentBenefitsMgr::get("Premium_Plus").getGroupMembershipLimit();
        args["MAX_PREMIUM_PLUS"] = max_premium_plus;
        LLNotificationsUtil::add("GroupLimitInfoPlus", args);
    }
    else
    {
        LLNotificationsUtil::add("GroupLimitInfo", args);
    }
}

void LLPanelPeople::onTabSelected(const LLSD& param)
{
    updateButtons();

    showFriendsAccordionsIfNeeded();
}

void LLPanelPeople::onAvatarListDoubleClicked(LLUICtrl* ctrl)
{
    LLAvatarListItem* item = dynamic_cast<LLAvatarListItem*>(ctrl);
    if(!item)
    {
        return;
    }

    LLUUID clicked_id = item->getAvatarId();
    if(gAgent.getID() == clicked_id)
    {
        return;
    }

#if 0 // SJB: Useful for testing, but not currently functional or to spec
    LLAvatarActions::showProfile(clicked_id);
#else // spec says open IM window
    LLAvatarActions::startIM(clicked_id);
#endif
}

void LLPanelPeople::onAvatarListCommitted(LLAvatarList* list)
{
    if (getActiveTabName() == NEARBY_TAB_NAME)
    {
        uuid_vec_t selected_uuids;
        getCurrentItemIDs(selected_uuids);
        mMiniMap->setSelected(selected_uuids);
    }
    // Make sure only one of the friends lists (online/all) has selection.
    else if (getActiveTabName() == FRIENDS_TAB_NAME)
    {
        if (list == mOnlineFriendList)
            mAllFriendList->resetSelection(true);
        else if (list == mAllFriendList)
            mOnlineFriendList->resetSelection(true);
        else
            llassert(0 && "commit on unknown friends list");
    }

    updateButtons();
}

void LLPanelPeople::onAddFriendButtonClicked()
{
    LLUUID id = getCurrentItemID();
    if (id.notNull())
    {
        LLAvatarActions::requestFriendshipDialog(id);
    }
}

bool LLPanelPeople::isItemsFreeOfFriends(const uuid_vec_t& uuids)
{
    const LLAvatarTracker& av_tracker = LLAvatarTracker::instance();
    for (const LLUUID& uuid : uuids)
    {
        if (av_tracker.isBuddy(uuid))
        {
            return false;
        }
    }
    return true;
}

void LLPanelPeople::onAddFriendWizButtonClicked()
{
    LLPanel* cur_panel = mTabContainer->getCurrentPanel();
    LLView * button = cur_panel->findChild<LLButton>("friends_add_btn", true);

    // Show add friend wizard.
    LLFloater* root_floater = gFloaterView->getParentFloater(this);
    LLFloaterAvatarPicker* picker = LLFloaterAvatarPicker::show(boost::bind(&LLPanelPeople::onAvatarPicked, _1, _2), false, true, false, root_floater->getName(), button);
    if (!picker)
    {
        return;
    }

    // Need to disable 'ok' button when friend occurs in selection
    picker->setOkBtnEnableCb(boost::bind(&LLPanelPeople::isItemsFreeOfFriends, this, _1));

    if (root_floater)
    {
        root_floater->addDependentFloater(picker);
    }

    mPicker = picker->getHandle();
}

void LLPanelPeople::onDeleteFriendButtonClicked()
{
    uuid_vec_t selected_uuids;
    getCurrentItemIDs(selected_uuids);

    if (selected_uuids.size() == 1)
    {
        LLAvatarActions::removeFriendDialog( selected_uuids.front() );
    }
    else if (selected_uuids.size() > 1)
    {
        LLAvatarActions::removeFriendsDialog( selected_uuids );
    }
}

void LLPanelPeople::onChatButtonClicked()
{
    LLUUID group_id = getCurrentItemID();
    if (group_id.notNull())
        LLGroupActions::startIM(group_id);
}

void LLPanelPeople::onGearButtonClicked(LLUICtrl* btn)
{
    uuid_vec_t selected_uuids;
    getCurrentItemIDs(selected_uuids);
    // Spawn at bottom left corner of the button.
    if (getActiveTabName() == NEARBY_TAB_NAME)
        LLPanelPeopleMenus::gNearbyPeopleContextMenu.show(btn, selected_uuids, 0, 0);
    else
        LLPanelPeopleMenus::gPeopleContextMenu.show(btn, selected_uuids, 0, 0);
}

void LLPanelPeople::onImButtonClicked()
{
    uuid_vec_t selected_uuids;
    getCurrentItemIDs(selected_uuids);
    if ( selected_uuids.size() == 1 )
    {
        // if selected only one person then start up IM
        LLAvatarActions::startIM(selected_uuids.at(0));
    }
    else if ( selected_uuids.size() > 1 )
    {
        // for multiple selection start up friends conference
        LLAvatarActions::startConference(selected_uuids);
    }
}

// static
void LLPanelPeople::onAvatarPicked(const uuid_vec_t& ids, const std::vector<LLAvatarName> names)
{
    if (!names.empty() && !ids.empty())
        LLAvatarActions::requestFriendshipDialog(ids[0], names[0].getCompleteName());
}

bool LLPanelPeople::onGroupPlusButtonValidate()
{
    if (!gAgent.canJoinGroups())
    {
        LLNotificationsUtil::add("JoinedTooManyGroups");
        return false;
    }

    return true;
}

void LLPanelPeople::onGroupMinusButtonClicked()
{
    LLUUID group_id = getCurrentItemID();
    if (group_id.notNull())
        LLGroupActions::leave(group_id);
}

void LLPanelPeople::onGroupPlusMenuItemClicked(const LLSD& userdata)
{
    std::string chosen_item = userdata.asString();

    if (chosen_item == "join_group")
        LLGroupActions::search();
    else if (chosen_item == "new_group")
        LLGroupActions::createGroup();
}

void LLPanelPeople::onFriendsViewSortMenuItemClicked(const LLSD& userdata)
{
    std::string chosen_item = userdata.asString();

    if (chosen_item == "sort_name")
    {
        setSortOrder(mAllFriendList, E_SORT_BY_NAME);
    }
    else if (chosen_item == "sort_status")
    {
        setSortOrder(mAllFriendList, E_SORT_BY_STATUS);
    }
    else if (chosen_item == "view_icons")
    {
        mAllFriendList->toggleIcons();
        mOnlineFriendList->toggleIcons();
    }
    else if (chosen_item == "view_permissions")
    {
        bool show_permissions = !gSavedSettings.getBOOL("FriendsListShowPermissions");
        gSavedSettings.setBOOL("FriendsListShowPermissions", show_permissions);

        mAllFriendList->showPermissions(show_permissions);
        mOnlineFriendList->showPermissions(show_permissions);
    }
    else if (chosen_item == "view_usernames")
    {
        bool hide_usernames = !gSavedSettings.getBOOL("FriendsListHideUsernames");
        gSavedSettings.setBOOL("FriendsListHideUsernames", hide_usernames);

        mAllFriendList->setShowCompleteName(!hide_usernames);
        mAllFriendList->handleDisplayNamesOptionChanged();
        mOnlineFriendList->setShowCompleteName(!hide_usernames);
        mOnlineFriendList->handleDisplayNamesOptionChanged();
    }
    }

void LLPanelPeople::onGroupsViewSortMenuItemClicked(const LLSD& userdata)
{
    std::string chosen_item = userdata.asString();

    if (chosen_item == "show_icons")
    {
        mGroupList->toggleIcons();
    }
}

void LLPanelPeople::onNearbyViewSortMenuItemClicked(const LLSD& userdata)
{
    std::string chosen_item = userdata.asString();

    if (chosen_item == "sort_by_recent_speakers")
    {
        setSortOrder(mNearbyList, E_SORT_BY_RECENT_SPEAKERS);
    }
    else if (chosen_item == "sort_name")
    {
        setSortOrder(mNearbyList, E_SORT_BY_NAME);
    }
    else if (chosen_item == "view_icons")
    {
        mNearbyList->toggleIcons();
    }
    else if (chosen_item == "sort_distance")
    {
        setSortOrder(mNearbyList, E_SORT_BY_DISTANCE);
    }
    else if (chosen_item == "sort_arrival")
    {
        setSortOrder(mNearbyList, E_SORT_BY_RECENT_ARRIVAL);
    }
    else if (chosen_item == "view_usernames")
    {
        bool hide_usernames = !gSavedSettings.getBOOL("NearbyListHideUsernames");
        gSavedSettings.setBOOL("NearbyListHideUsernames", hide_usernames);

        mNearbyList->setShowCompleteName(!hide_usernames);
        mNearbyList->handleDisplayNamesOptionChanged();
    }
}

bool LLPanelPeople::onNearbyViewSortMenuItemCheck(const LLSD& userdata)
{
    std::string item = userdata.asString();
    U32 sort_order = gSavedSettings.getU32("NearbyPeopleSortOrder");

    if (item == "sort_by_recent_speakers")
        return sort_order == E_SORT_BY_RECENT_SPEAKERS;
    if (item == "sort_name")
        return sort_order == E_SORT_BY_NAME;
    if (item == "sort_distance")
        return sort_order == E_SORT_BY_DISTANCE;
    if (item == "sort_arrival")
        return sort_order == E_SORT_BY_RECENT_ARRIVAL;

    return false;
}

void LLPanelPeople::onRecentViewSortMenuItemClicked(const LLSD& userdata)
{
    std::string chosen_item = userdata.asString();

    if (chosen_item == "sort_recent")
    {
        setSortOrder(mRecentList, E_SORT_BY_MOST_RECENT);
    }
    else if (chosen_item == "sort_name")
    {
        setSortOrder(mRecentList, E_SORT_BY_NAME);
    }
    else if (chosen_item == "view_icons")
    {
        mRecentList->toggleIcons();
    }
}

bool LLPanelPeople::onFriendsViewSortMenuItemCheck(const LLSD& userdata)
{
    std::string item = userdata.asString();
    U32 sort_order = gSavedSettings.getU32("FriendsSortOrder");

    if (item == "sort_name")
        return sort_order == E_SORT_BY_NAME;
    if (item == "sort_status")
        return sort_order == E_SORT_BY_STATUS;

    return false;
}

bool LLPanelPeople::onRecentViewSortMenuItemCheck(const LLSD& userdata)
{
    std::string item = userdata.asString();
    U32 sort_order = gSavedSettings.getU32("RecentPeopleSortOrder");

    if (item == "sort_recent")
        return sort_order == E_SORT_BY_MOST_RECENT;
    if (item == "sort_name")
        return sort_order == E_SORT_BY_NAME;

    return false;
}

void LLPanelPeople::onMoreButtonClicked()
{
    // *TODO: not implemented yet
}

void    LLPanelPeople::onOpen(const LLSD& key)
{
    std::string tab_name = key["people_panel_tab_name"];
    if (!tab_name.empty())
    {
        mTabContainer->selectTabByName(tab_name);
        if(tab_name == BLOCKED_TAB_NAME)
        {
            LLPanel* blocked_tab = mTabContainer->getCurrentPanel()->findChild<LLPanel>("panel_block_list_sidetray");
            if(blocked_tab)
            {
                blocked_tab->onOpen(key);
            }
        }
    }
}

bool LLPanelPeople::notifyChildren(const LLSD& info)
{
    if (info.has("task-panel-action") && info["task-panel-action"].asString() == "handle-tri-state")
    {
        LLSideTrayPanelContainer* container = dynamic_cast<LLSideTrayPanelContainer*>(getParent());
        if (!container)
        {
            LL_WARNS() << "Cannot find People panel container" << LL_ENDL;
            return true;
        }

        if (container->getCurrentPanelIndex() > 0)
        {
            // if not on the default panel, switch to it
            container->onOpen(LLSD().with(LLSideTrayPanelContainer::PARAM_SUB_PANEL_NAME, getName()));
        }
        else
            LLFloaterReg::hideInstance("people");

        return true; // this notification is only supposed to be handled by task panels
    }

    return LLPanel::notifyChildren(info);
}

void LLPanelPeople::showAccordion(LLAccordionCtrlTab* tab, bool show)
{
    tab->setVisible(show);
    if(show)
    {
        // don't expand accordion if it was collapsed by user
        if(!isAccordionCollapsedByUser(tab))
        {
            // expand accordion
            tab->changeOpenClose(false);
        }
    }
}

void LLPanelPeople::showFriendsAccordionsIfNeeded()
{
    if(FRIENDS_TAB_NAME == getActiveTabName())
    {
        // Expand and show accordions if needed, else - hide them
        showAccordion(mFriendsOnlineTab, mOnlineFriendList->filterHasMatches());
        showAccordion(mFriendsAllTab, mAllFriendList->filterHasMatches());

        // Rearrange accordions
        mFriendsAccordion->arrange();

        // *TODO: new no_matched_tabs_text attribute was implemented in accordion (EXT-7368).
        // this code should be refactored to use it
        // keep help text in a synchronization with accordions visibility.
        updateFriendListHelpText();
    }
}

void LLPanelPeople::onFriendListRefreshComplete(LLUICtrl*ctrl, const LLSD& param)
{
    if(ctrl == mOnlineFriendList)
    {
        showAccordion(mFriendsOnlineTab, param.asInteger());
    }
    else if(ctrl == mAllFriendList)
    {
        showAccordion(mFriendsAllTab, param.asInteger());
    }
}

void LLPanelPeople::setAccordionCollapsedByUser(LLUICtrl* acc_tab, bool collapsed)
{
    if(!acc_tab)
    {
        LL_WARNS() << "Invalid parameter" << LL_ENDL;
        return;
    }

    LLSD param = acc_tab->getValue();
    param[COLLAPSED_BY_USER] = collapsed;
    acc_tab->setValue(param);
}

void LLPanelPeople::setAccordionCollapsedByUser(const std::string& name, bool collapsed)
{
    setAccordionCollapsedByUser(getChild<LLUICtrl>(name), collapsed);
}

bool LLPanelPeople::isAccordionCollapsedByUser(LLUICtrl* acc_tab)
{
    if(!acc_tab)
    {
        LL_WARNS() << "Invalid parameter" << LL_ENDL;
        return false;
    }

    LLSD param = acc_tab->getValue();
    if(!param.has(COLLAPSED_BY_USER))
    {
        return false;
    }
    return param[COLLAPSED_BY_USER].asBoolean();
}

bool LLPanelPeople::isAccordionCollapsedByUser(const std::string& name)
{
    return isAccordionCollapsedByUser(getChild<LLUICtrl>(name));
}

bool LLPanelPeople::updateNearbyArrivalTime()
{
    std::vector<LLVector3d> positions;
    std::vector<LLUUID> uuids;
    static LLCachedControl<F32> range(gSavedSettings, "NearMeRange");
    LLWorld::getInstance()->getAvatars(&uuids, &positions, gAgent.getPositionGlobal(), range);
    LLRecentPeople::instance().updateAvatarsArrivalTime(uuids);
    return LLApp::isExiting();
}


// EOF