/**
 * @file llappearancemgr.cpp
 * @brief Manager for initiating appearance changes on the viewer
 *
 * $LicenseInfo:firstyear=2004&license=viewerlgpl$
 * 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 <boost/lexical_cast.hpp>
#include "llaccordionctrltab.h"
#include "llagent.h"
#include "llagentcamera.h"
#include "llagentwearables.h"
#include "llappearancemgr.h"
#include "llattachmentsmgr.h"
#include "llcommandhandler.h"
#include "lleventtimer.h"
#include "llfloatersidepanelcontainer.h"
#include "llgesturemgr.h"
#include "llinventorybridge.h"
#include "llinventoryfunctions.h"
#include "llinventorymodelbackgroundfetch.h"
#include "llinventoryobserver.h"
#include "llmd5.h"
#include "llnotificationsutil.h"
#include "llmd5.h"
#include "lloutfitobserver.h"
#include "lloutfitslist.h"
#include "llselectmgr.h"
#include "llsidepanelappearance.h"
#include "llviewerobjectlist.h"
#include "llvoavatar.h"
#include "llvoavatarself.h"
#include "llviewerregion.h"
#include "llwearablelist.h"
#include "llsdutil.h"
#include "llsdserialize.h"
#include "llhttpretrypolicy.h"
#include "llaisapi.h"
#include "llhttpsdhandler.h"
#include "llcorehttputil.h"
#include "llappviewer.h"
#include "llcoros.h"
#include "lleventcoro.h"
#include "lluiusage.h"

#include "llavatarpropertiesprocessor.h"

#if LL_MSVC
// disable boost::lexical_cast warning
#pragma warning (disable:4702)
#endif

namespace
{
    const S32   BAKE_RETRY_MAX_COUNT = 5;
    const F32   BAKE_RETRY_TIMEOUT = 2.0F;
}

// *TODO$: LLInventoryCallback should be deprecated to conform to the new boost::bind/coroutine model.
// temp code in transition
void doAppearanceCb(LLPointer<LLInventoryCallback> cb, LLUUID id)
{
    if (cb.notNull())
        cb->fire(id);
}

std::string self_av_string()
{
    // On logout gAgentAvatarp can already be invalid
    return isAgentAvatarValid() ? gAgentAvatarp->avString() : "";
}

// RAII thingy to guarantee that a variable gets reset when the Setter
// goes out of scope.  More general utility would be handy - TODO:
// check boost.
class BoolSetter
{
public:
    BoolSetter(bool& var):
        mVar(var)
    {
        mVar = true;
    }
    ~BoolSetter()
    {
        mVar = false;
    }
private:
    bool& mVar;
};

char ORDER_NUMBER_SEPARATOR('@');

class LLOutfitUnLockTimer: public LLEventTimer
{
public:
    LLOutfitUnLockTimer(F32 period) : LLEventTimer(period)
    {
        // restart timer on BOF changed event
        LLOutfitObserver::instance().addBOFChangedCallback(boost::bind(
                &LLOutfitUnLockTimer::reset, this));
        stop();
    }

    /*virtual*/
    bool tick()
    {
        if(mEventTimer.hasExpired())
        {
            LLAppearanceMgr::instance().setOutfitLocked(false);
        }
        return false;
    }
    void stop() { mEventTimer.stop(); }
    void start() { mEventTimer.start(); }
    void reset() { mEventTimer.reset(); }
    bool getStarted() { return mEventTimer.getStarted(); }

    LLTimer&  getEventTimer() { return mEventTimer;}
};

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

    bool handle(const LLSD& params,
                const LLSD& query_map,
                const std::string& grid,
                LLMediaCtrl* web)
    {
        // support secondlife:///app/appearance/show, but for now we just
        // make all secondlife:///app/appearance SLapps behave this way
        if (!LLUI::getInstance()->mSettingGroups["config"]->getBOOL("EnableAppearance"))
        {
            LLNotificationsUtil::add("NoAppearance", LLSD(), LLSD(), std::string("SwitchToStandardSkinAndQuit"));
            return true;
        }

        LLFloaterSidePanelContainer::showPanel("appearance", LLSD());
        return true;
    }
};

LLAppearanceHandler gAppearanceHandler;


LLUUID findDescendentCategoryIDByName(const LLUUID& parent_id, const std::string& name)
{
    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    LLNameCategoryCollector has_name(name);
    gInventory.collectDescendentsIf(parent_id,
                                    cat_array,
                                    item_array,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    has_name);
    if (0 == cat_array.size())
        return LLUUID();
    else
    {
        LLViewerInventoryCategory *cat = cat_array.at(0);
        if (cat)
            return cat->getUUID();
        else
        {
            LL_WARNS() << "null cat" << LL_ENDL;
            return LLUUID();
        }
    }
}

// We want this to be much lower (e.g. 15.0 is usually fine), bumping
// up for now until we can diagnose some cases of very slow response
// to requests.
const F32 DEFAULT_RETRY_AFTER_INTERVAL = 300.0;

// Given the current back-end problems, retrying is causing too many
// duplicate items. Bump this back to 2 once they are resolved (or can
// leave at 0 if the operations become actually reliable).
const S32 DEFAULT_MAX_RETRIES = 0;

class LLCallAfterInventoryBatchMgr: public LLEventTimer
{
public:
    LLCallAfterInventoryBatchMgr(const LLUUID& dst_cat_id,
                                 const std::string& phase_name,
                                 nullary_func_t on_completion_func,
                                 nullary_func_t on_failure_func = no_op,
                                 F32 retry_after = DEFAULT_RETRY_AFTER_INTERVAL,
                                 S32 max_retries = DEFAULT_MAX_RETRIES
        ):
        mDstCatID(dst_cat_id),
        mTrackingPhase(phase_name),
        mOnCompletionFunc(on_completion_func),
        mOnFailureFunc(on_failure_func),
        mRetryAfter(retry_after),
        mMaxRetries(max_retries),
        mPendingRequests(0),
        mFailCount(0),
        mCompletionOrFailureCalled(false),
        mRetryCount(0),
        LLEventTimer(5.0)
    {
        if (!mTrackingPhase.empty())
        {
            selfStartPhase(mTrackingPhase);
        }
    }

    void addItems(LLInventoryModel::item_array_t& src_items)
    {
        for (LLInventoryModel::item_array_t::const_iterator it = src_items.begin();
             it != src_items.end();
             ++it)
        {
            LLViewerInventoryItem* item = *it;
            llassert(item);
            addItem(item->getUUID());
        }
    }

    // Request or re-request operation for specified item.
    void addItem(const LLUUID& item_id)
    {
        LL_DEBUGS("Avatar") << "item_id " << item_id << LL_ENDL;
        if (!requestOperation(item_id))
        {
            LL_DEBUGS("Avatar") << "item_id " << item_id << " requestOperation false, skipping" << LL_ENDL;
            return;
        }

        mPendingRequests++;
        // On a re-request, this will reset the timer.
        mWaitTimes[item_id] = LLTimer();
        if (mRetryCounts.find(item_id) == mRetryCounts.end())
        {
            mRetryCounts[item_id] = 0;
        }
        else
        {
            mRetryCounts[item_id]++;
        }
    }

    virtual bool requestOperation(const LLUUID& item_id) = 0;

    void onOp(const LLUUID& src_id, const LLUUID& dst_id, LLTimer timestamp)
    {
        if (ll_frand() < gSavedSettings.getF32("InventoryDebugSimulateLateOpRate"))
        {
            LL_WARNS() << "Simulating late operation by punting handling to later" << LL_ENDL;
            doAfterInterval(boost::bind(&LLCallAfterInventoryBatchMgr::onOp,this,src_id,dst_id,timestamp),
                            mRetryAfter);
            return;
        }
        mPendingRequests--;
        F32 elapsed = timestamp.getElapsedTimeF32();
        LL_DEBUGS("Avatar") << "op done, src_id " << src_id << " dst_id " << dst_id << " after " << elapsed << " seconds" << LL_ENDL;
        if (mWaitTimes.find(src_id) == mWaitTimes.end())
        {
            // No longer waiting for this item - either serviced
            // already or gave up after too many retries.
            LL_WARNS() << "duplicate or late operation, src_id " << src_id << "dst_id " << dst_id
                    << " elapsed " << elapsed << " after end " << (S32) mCompletionOrFailureCalled << LL_ENDL;
        }
        mTimeStats.push(elapsed);
        mWaitTimes.erase(src_id);
        if (mWaitTimes.empty() && !mCompletionOrFailureCalled)
        {
            onCompletionOrFailure();
        }
    }

    void onCompletionOrFailure()
    {
        assert (!mCompletionOrFailureCalled);
        mCompletionOrFailureCalled = true;

        // Will never call onCompletion() if any item has been flagged as
        // a failure - otherwise could wind up with corrupted
        // outfit, involuntary nudity, etc.
        reportStats();
        if (!mTrackingPhase.empty())
        {
            selfStopPhase(mTrackingPhase);
        }
        if (!mFailCount)
        {
            onCompletion();
        }
        else
        {
            onFailure();
        }
    }

    void onFailure()
    {
        LL_INFOS() << "failed" << LL_ENDL;
        mOnFailureFunc();
    }

    void onCompletion()
    {
        LL_INFOS() << "done" << LL_ENDL;
        mOnCompletionFunc();
    }

    // virtual
    // Will be deleted after returning true - only safe to do this if all callbacks have fired.
    bool tick()
    {
        // mPendingRequests will be zero if all requests have been
        // responded to.  mWaitTimes.empty() will be true if we have
        // received at least one reply for each UUID.  If requests
        // have been dropped and retried, these will not necessarily
        // be the same.  Only safe to return true if all requests have
        // been serviced, since it will result in this object being
        // deleted.
        bool all_done = (mPendingRequests==0);

        if (!mWaitTimes.empty())
        {
            LL_WARNS() << "still waiting on " << mWaitTimes.size() << " items" << LL_ENDL;
            for (std::map<LLUUID,LLTimer>::iterator it = mWaitTimes.begin();
                 it != mWaitTimes.end();)
            {
                // Use a copy of iterator because it may be erased/invalidated.
                std::map<LLUUID,LLTimer>::iterator curr_it = it;
                ++it;

                F32 time_waited = curr_it->second.getElapsedTimeF32();
                S32 retries = mRetryCounts[curr_it->first];
                if (time_waited > mRetryAfter)
                {
                    if (retries < mMaxRetries)
                    {
                        LL_DEBUGS("Avatar") << "Waited " << time_waited <<
                            " for " << curr_it->first << ", retrying" << LL_ENDL;
                        mRetryCount++;
                        addItem(curr_it->first);
                    }
                    else
                    {
                        LL_WARNS() << "Giving up on " << curr_it->first << " after too many retries" << LL_ENDL;
                        mWaitTimes.erase(curr_it);
                        mFailCount++;
                    }
                }
                if (mWaitTimes.empty())
                {
                    onCompletionOrFailure();
                }

            }
        }
        return all_done;
    }

    void reportStats()
    {
        LL_DEBUGS("Avatar") << "Phase: " << mTrackingPhase << LL_ENDL;
        LL_DEBUGS("Avatar") << "mFailCount: " << mFailCount << LL_ENDL;
        LL_DEBUGS("Avatar") << "mRetryCount: " << mRetryCount << LL_ENDL;
        LL_DEBUGS("Avatar") << "Times: n " << mTimeStats.getCount() << " min " << mTimeStats.getMinValue() << " max " << mTimeStats.getMaxValue() << LL_ENDL;
        LL_DEBUGS("Avatar") << "Mean " << mTimeStats.getMean() << " stddev " << mTimeStats.getStdDev() << LL_ENDL;
    }

    virtual ~LLCallAfterInventoryBatchMgr()
    {
        LL_DEBUGS("Avatar") << "deleting" << LL_ENDL;
    }

protected:
    std::string mTrackingPhase;
    std::map<LLUUID,LLTimer> mWaitTimes;
    std::map<LLUUID,S32> mRetryCounts;
    LLUUID mDstCatID;
    nullary_func_t mOnCompletionFunc;
    nullary_func_t mOnFailureFunc;
    F32 mRetryAfter;
    S32 mMaxRetries;
    S32 mPendingRequests;
    S32 mFailCount;
    S32 mRetryCount;
    bool mCompletionOrFailureCalled;
    LLViewerStats::StatsAccumulator mTimeStats;
};

class LLCallAfterInventoryCopyMgr: public LLCallAfterInventoryBatchMgr
{
public:
    LLCallAfterInventoryCopyMgr(LLInventoryModel::item_array_t& src_items,
                                const LLUUID& dst_cat_id,
                                const std::string& phase_name,
                                nullary_func_t on_completion_func,
                                nullary_func_t on_failure_func = no_op,
                                 F32 retry_after = DEFAULT_RETRY_AFTER_INTERVAL,
                                 S32 max_retries = DEFAULT_MAX_RETRIES
        ):
        LLCallAfterInventoryBatchMgr(dst_cat_id, phase_name, on_completion_func, on_failure_func, retry_after, max_retries)
    {
        addItems(src_items);
        sInstanceCount++;
    }

    ~LLCallAfterInventoryCopyMgr()
    {
        sInstanceCount--;
    }

    virtual bool requestOperation(const LLUUID& item_id)
    {
        LLViewerInventoryItem *item = gInventory.getItem(item_id);
        llassert(item);
        LL_DEBUGS("Avatar") << "copying item " << item_id << LL_ENDL;
        if (ll_frand() < gSavedSettings.getF32("InventoryDebugSimulateOpFailureRate"))
        {
            LL_DEBUGS("Avatar") << "simulating failure by not sending request for item " << item_id << LL_ENDL;
            return true;
        }
        copy_inventory_item(
            gAgent.getID(),
            item->getPermissions().getOwner(),
            item->getUUID(),
            mDstCatID,
            std::string(),
            new LLBoostFuncInventoryCallback(boost::bind(&LLCallAfterInventoryBatchMgr::onOp,this,item_id,_1,LLTimer()))
            );
        return true;
    }

    static S32 getInstanceCount() { return sInstanceCount; }

private:
    static S32 sInstanceCount;
};

S32 LLCallAfterInventoryCopyMgr::sInstanceCount = 0;

class LLWearCategoryAfterCopy: public LLInventoryCallback
{
public:
    LLWearCategoryAfterCopy(bool append):
        mAppend(append)
    {}

    // virtual
    void fire(const LLUUID& id)
    {
        // Wear the inventory category.
        LLInventoryCategory* cat = gInventory.getCategory(id);
        LLAppearanceMgr::instance().wearInventoryCategoryOnAvatar(cat, mAppend);
    }

private:
    bool mAppend;
};

class LLTrackPhaseWrapper : public LLInventoryCallback
{
public:
    LLTrackPhaseWrapper(const std::string& phase_name, LLPointer<LLInventoryCallback> cb = NULL):
        mTrackingPhase(phase_name),
        mCB(cb)
    {
        selfStartPhase(mTrackingPhase);
    }

    // virtual
    void fire(const LLUUID& id)
    {
        if (mCB)
        {
            mCB->fire(id);
        }
    }

    // virtual
    ~LLTrackPhaseWrapper()
    {
        selfStopPhase(mTrackingPhase);
    }

protected:
    std::string mTrackingPhase;
    LLPointer<LLInventoryCallback> mCB;
};

LLUpdateAppearanceOnDestroy::LLUpdateAppearanceOnDestroy(bool enforce_item_restrictions,
                                                         bool enforce_ordering,
                                                         nullary_func_t post_update_func
    ):
    mFireCount(0),
    mEnforceItemRestrictions(enforce_item_restrictions),
    mEnforceOrdering(enforce_ordering),
    mPostUpdateFunc(post_update_func)
{
    selfStartPhase("update_appearance_on_destroy");
}

void LLUpdateAppearanceOnDestroy::fire(const LLUUID& inv_item)
{
    LLViewerInventoryItem* item = (LLViewerInventoryItem*)gInventory.getItem(inv_item);
    const std::string item_name = item ? item->getName() : "ITEM NOT FOUND";
#ifndef LL_RELEASE_FOR_DOWNLOAD
    LL_DEBUGS("Avatar") << self_av_string() << "callback fired [ name:" << item_name << " UUID:" << inv_item << " count:" << mFireCount << " ] " << LL_ENDL;
#endif
    mFireCount++;
}

LLUpdateAppearanceOnDestroy::~LLUpdateAppearanceOnDestroy()
{
    if (!LLApp::isExiting())
    {
        // speculative fix for MAINT-1150
        LL_INFOS("Avatar") << self_av_string() << "done update appearance on destroy" << LL_ENDL;

        selfStopPhase("update_appearance_on_destroy");

        LLAppearanceMgr::instance().updateAppearanceFromCOF(mEnforceItemRestrictions,
                                                            mEnforceOrdering,
                                                            mPostUpdateFunc);
    }
}

LLUpdateAppearanceAndEditWearableOnDestroy::LLUpdateAppearanceAndEditWearableOnDestroy(const LLUUID& item_id):
    mItemID(item_id)
{
}

LLRequestServerAppearanceUpdateOnDestroy::~LLRequestServerAppearanceUpdateOnDestroy()
{
    LL_DEBUGS("Avatar") << "ATT requesting server appearance update" << LL_ENDL;
    if (!LLApp::isExiting())
    {
        LLAppearanceMgr::instance().requestServerAppearanceUpdate();
    }
}

void edit_wearable_and_customize_avatar(LLUUID item_id)
{
    // Start editing the item if previously requested.
    gAgentWearables.editWearableIfRequested(item_id);

    // TODO: camera mode may not be changed if a debug setting is tweaked
    if( gAgentCamera.cameraCustomizeAvatar() )
    {
        // If we're in appearance editing mode, the current tab may need to be refreshed
        LLSidepanelAppearance *panel = dynamic_cast<LLSidepanelAppearance*>(
            LLFloaterSidePanelContainer::getPanel("appearance"));
        if (panel)
        {
            panel->showDefaultSubpart();
        }
    }
}

LLUpdateAppearanceAndEditWearableOnDestroy::~LLUpdateAppearanceAndEditWearableOnDestroy()
{
    if (!LLApp::isExiting())
    {
        LLAppearanceMgr::instance().updateAppearanceFromCOF(
            true,true,
            boost::bind(edit_wearable_and_customize_avatar, mItemID));
    }
}

class LLBrokenLinkObserver : public LLInventoryObserver
{
public:
    LLUUID mUUID;
    bool mEnforceItemRestrictions;
    bool mEnforceOrdering;
    nullary_func_t mPostUpdateFunc;

    LLBrokenLinkObserver(const LLUUID& uuid,
                          bool enforce_item_restrictions ,
                          bool enforce_ordering ,
                          nullary_func_t post_update_func) :
        mUUID(uuid),
        mEnforceItemRestrictions(enforce_item_restrictions),
        mEnforceOrdering(enforce_ordering),
        mPostUpdateFunc(post_update_func)
    {
    }
    /* virtual */ void changed(U32 mask);
    void postProcess();
};

void LLBrokenLinkObserver::changed(U32 mask)
{
    if (mask & LLInventoryObserver::REBUILD)
    {
        // This observer should be executed after LLInventoryPanel::itemChanged(),
        // but if it isn't, consider calling updateAppearanceFromCOF with a delay
        const uuid_set_t& changed_item_ids = gInventory.getChangedIDs();
        for (uuid_set_t::const_iterator it = changed_item_ids.begin(); it != changed_item_ids.end(); ++it)
        {
            const LLUUID& id = *it;
            if (id == mUUID)
            {
                // Might not be processed yet and it is not a
                // good idea to update appearane here, postpone.
                doOnIdleOneTime([this]()
                                {
                                    postProcess();
                                });

                gInventory.removeObserver(this);
                return;
            }
        }
    }
}

void LLBrokenLinkObserver::postProcess()
{
    LLViewerInventoryItem* item = gInventory.getItem(mUUID);
    llassert(item && !item->getIsBrokenLink()); // the whole point was to get a correct link
    if (item && item->getIsBrokenLink())
    {
        LL_INFOS_ONCE("Avatar") << "Outfit link broken despite being regenerated" << LL_ENDL;
        LL_DEBUGS("Avatar", "Inventory") << "Outfit link " << mUUID << " \"" << item->getName() << "\" is broken despite being regenerated" << LL_ENDL;
    }

    LLAppearanceMgr::instance().updateAppearanceFromCOF(
        mEnforceItemRestrictions ,
        mEnforceOrdering ,
        mPostUpdateFunc);
    delete this;
}


struct LLFoundData
{
    LLFoundData() :
        mAssetType(LLAssetType::AT_NONE),
        mWearableType(LLWearableType::WT_INVALID),
        mWearable(NULL) {}

    LLFoundData(const LLUUID& item_id,
                const LLUUID& asset_id,
                const std::string& name,
                const LLAssetType::EType& asset_type,
                const LLWearableType::EType& wearable_type,
                const bool is_replacement = false
        ) :
        mItemID(item_id),
        mAssetID(asset_id),
        mName(name),
        mAssetType(asset_type),
        mWearableType(wearable_type),
        mIsReplacement(is_replacement),
        mWearable( NULL ) {}

    LLUUID mItemID;
    LLUUID mAssetID;
    std::string mName;
    LLAssetType::EType mAssetType;
    LLWearableType::EType mWearableType;
    LLViewerWearable* mWearable;
    bool mIsReplacement;
};


class LLWearableHoldingPattern
{
    LOG_CLASS(LLWearableHoldingPattern);

public:
    LLWearableHoldingPattern();
    ~LLWearableHoldingPattern();

    bool pollFetchCompletion();
    void onFetchCompletion();
    bool isFetchCompleted();
    bool isTimedOut();

    void checkMissingWearables();
    bool pollMissingWearables();
    bool isMissingCompleted();
    void recoverMissingWearable(LLWearableType::EType type);
    void clearCOFLinksForMissingWearables();

    void onWearableAssetFetch(LLViewerWearable *wearable);
    void onAllComplete();

    typedef std::list<LLFoundData> found_list_t;
    found_list_t& getFoundList();
    void eraseTypeToLink(LLWearableType::EType type);
    void eraseTypeToRecover(LLWearableType::EType type);
    void setObjItems(const LLInventoryModel::item_array_t& items);
    void setGestItems(const LLInventoryModel::item_array_t& items);
    bool isMostRecent();
    void handleLateArrivals();
    void resetTime(F32 timeout);
    static S32 countActive() { return static_cast<S32>(sActiveHoldingPatterns.size()); }
    S32 index() { return mIndex; }

private:
    found_list_t mFoundList;
    LLInventoryModel::item_array_t mObjItems;
    LLInventoryModel::item_array_t mGestItems;
    typedef std::set<S32> type_set_t;
    type_set_t mTypesToRecover;
    type_set_t mTypesToLink;
    S32 mResolved;
    LLTimer mWaitTime;
    bool mFired;
    typedef std::set<LLWearableHoldingPattern*> type_set_hp;
    static type_set_hp sActiveHoldingPatterns;
    static S32 sNextIndex;
    S32 mIndex;
    bool mIsMostRecent;
    std::set<LLViewerWearable*> mLateArrivals;
    bool mIsAllComplete;
};

LLWearableHoldingPattern::type_set_hp LLWearableHoldingPattern::sActiveHoldingPatterns;
S32 LLWearableHoldingPattern::sNextIndex = 0;

LLWearableHoldingPattern::LLWearableHoldingPattern():
    mResolved(0),
    mFired(false),
    mIsMostRecent(true),
    mIsAllComplete(false)
{
    if (countActive()>0)
    {
        LL_INFOS() << "Creating LLWearableHoldingPattern when "
                   << countActive()
                   << " other attempts are active."
                   << " Flagging others as invalid."
                   << LL_ENDL;
        for (type_set_hp::iterator it = sActiveHoldingPatterns.begin();
             it != sActiveHoldingPatterns.end();
             ++it)
        {
            (*it)->mIsMostRecent = false;
        }

    }
    mIndex = sNextIndex++;
    sActiveHoldingPatterns.insert(this);
    LL_DEBUGS("Avatar") << "HP " << index() << " created" << LL_ENDL;
    selfStartPhase("holding_pattern");
}

LLWearableHoldingPattern::~LLWearableHoldingPattern()
{
    sActiveHoldingPatterns.erase(this);
    if (isMostRecent())
    {
        selfStopPhase("holding_pattern");
    }
    LL_DEBUGS("Avatar") << "HP " << index() << " deleted" << LL_ENDL;
}

bool LLWearableHoldingPattern::isMostRecent()
{
    return mIsMostRecent;
}

LLWearableHoldingPattern::found_list_t& LLWearableHoldingPattern::getFoundList()
{
    return mFoundList;
}

void LLWearableHoldingPattern::eraseTypeToLink(LLWearableType::EType type)
{
    mTypesToLink.erase(type);
}

void LLWearableHoldingPattern::eraseTypeToRecover(LLWearableType::EType type)
{
    mTypesToRecover.erase(type);
}

void LLWearableHoldingPattern::setObjItems(const LLInventoryModel::item_array_t& items)
{
    mObjItems = items;
}

void LLWearableHoldingPattern::setGestItems(const LLInventoryModel::item_array_t& items)
{
    mGestItems = items;
}

bool LLWearableHoldingPattern::isFetchCompleted()
{
    return (mResolved >= (S32)getFoundList().size()); // have everything we were waiting for?
}

bool LLWearableHoldingPattern::isTimedOut()
{
    return mWaitTime.hasExpired();
}

void LLWearableHoldingPattern::checkMissingWearables()
{
    if (!isMostRecent())
    {
        // runway why don't we actually skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    std::vector<S32> found_by_type(LLWearableType::WT_COUNT,0);
    std::vector<S32> requested_by_type(LLWearableType::WT_COUNT,0);
    for (found_list_t::iterator it = getFoundList().begin(); it != getFoundList().end(); ++it)
    {
        LLFoundData &data = *it;
        if (data.mWearableType < LLWearableType::WT_COUNT)
            requested_by_type[data.mWearableType]++;
        if (data.mWearable)
            found_by_type[data.mWearableType]++;
    }

    for (S32 type = 0; type < LLWearableType::WT_COUNT; ++type)
    {
        if (requested_by_type[type] > found_by_type[type])
        {
            LL_WARNS() << self_av_string() << "got fewer wearables than requested, type " << type << ": requested " << requested_by_type[type] << ", found " << found_by_type[type] << LL_ENDL;
        }
        if (found_by_type[type] > 0)
            continue;
        if (
            // If at least one wearable of certain types (pants/shirt/skirt)
            // was requested but none was found, create a default asset as a replacement.
            // In all other cases, don't do anything.
            // For critical types (shape/hair/skin/eyes), this will keep the avatar as a cloud
            // due to logic in LLVOAvatarSelf::getIsCloud().
            // For non-critical types (tatoo, socks, etc.) the wearable will just be missing.
            (requested_by_type[type] > 0) &&
            ((type == LLWearableType::WT_PANTS) || (type == LLWearableType::WT_SHIRT) || (type == LLWearableType::WT_SKIRT)))
        {
            mTypesToRecover.insert(type);
            mTypesToLink.insert(type);
            recoverMissingWearable((LLWearableType::EType)type);
            LL_WARNS() << self_av_string() << "need to replace " << type << LL_ENDL;
        }
    }

    resetTime(60.0F);

    if (isMostRecent())
    {
        selfStartPhase("get_missing_wearables_2");
    }
    if (!pollMissingWearables())
    {
        doOnIdleRepeating(boost::bind(&LLWearableHoldingPattern::pollMissingWearables,this));
    }
}

void LLWearableHoldingPattern::onAllComplete()
{
    if (isAgentAvatarValid())
    {
        gAgentAvatarp->outputRezTiming("Agent wearables fetch complete");
    }

    if (!isMostRecent())
    {
        // runway need to skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    // Activate all gestures in this folder
    if (mGestItems.size() > 0)
    {
        LL_DEBUGS("Avatar") << self_av_string() << "Activating " << mGestItems.size() << " gestures" << LL_ENDL;

        LLGestureMgr::instance().activateGestures(mGestItems);

        // Update the inventory item labels to reflect the fact
        // they are active.
        LLViewerInventoryCategory* catp =
            gInventory.getCategory(LLAppearanceMgr::instance().getCOF());

        if (catp)
        {
            gInventory.updateCategory(catp);
            gInventory.notifyObservers();
        }
    }

    if (isAgentAvatarValid())
    {
        LL_DEBUGS("Avatar") << self_av_string() << "Updating " << mObjItems.size() << " attachments" << LL_ENDL;
        LLAgentWearables::llvo_vec_t objects_to_remove;
        LLAgentWearables::llvo_vec_t objects_to_retain;
        LLInventoryModel::item_array_t items_to_add;

        LLAgentWearables::findAttachmentsAddRemoveInfo(mObjItems,
                                                       objects_to_remove,
                                                       objects_to_retain,
                                                       items_to_add);

        LL_DEBUGS("Avatar") << self_av_string() << "Removing " << objects_to_remove.size()
                            << " attachments" << LL_ENDL;

        // Here we remove the attachment pos overrides for *all*
        // attachments, even those that are not being removed. This is
        // needed to get joint positions all slammed down to their
        // pre-attachment states.
        gAgentAvatarp->clearAttachmentOverrides();

        if (objects_to_remove.size() || items_to_add.size())
        {
            LL_DEBUGS("Avatar") << "ATT will remove " << objects_to_remove.size()
                                << " and add " << items_to_add.size() << " items" << LL_ENDL;
        }

        // Take off the attachments that will no longer be in the outfit.
        LLAgentWearables::userRemoveMultipleAttachments(objects_to_remove);

        // Update wearables.
        LL_INFOS("Avatar") << self_av_string() << "HP " << index() << " updating agent wearables with "
                           << mResolved << " wearable items " << LL_ENDL;
        LLAppearanceMgr::instance().updateAgentWearables(this);

        // Restore attachment pos overrides for the attachments that
        // are remaining in the outfit.
        for (LLAgentWearables::llvo_vec_t::iterator it = objects_to_retain.begin();
             it != objects_to_retain.end();
             ++it)
        {
            LLViewerObject *objectp = *it;
            if (!objectp->isAnimatedObject())
            {
                gAgentAvatarp->addAttachmentOverridesForObject(objectp);
            }
        }

        // Add new attachments to match those requested.
        LL_DEBUGS("Avatar") << self_av_string() << "Adding " << items_to_add.size() << " attachments" << LL_ENDL;
        LLAgentWearables::userAttachMultipleAttachments(items_to_add);
    }

    if (isFetchCompleted() && isMissingCompleted())
    {
        // Only safe to delete if all wearable callbacks and all missing wearables completed.
        delete this;
    }
    else
    {
        mIsAllComplete = true;
        handleLateArrivals();
    }
}

void LLWearableHoldingPattern::onFetchCompletion()
{
    if (isMostRecent())
    {
        selfStopPhase("get_wearables_2");
    }

    if (!isMostRecent())
    {
        // runway skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    checkMissingWearables();
}

// Runs as an idle callback until all wearables are fetched (or we time out).
bool LLWearableHoldingPattern::pollFetchCompletion()
{
    if (!isMostRecent())
    {
        // runway skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    bool completed = isFetchCompleted();
    bool timed_out = isTimedOut();
    bool done = completed || timed_out;

    if (done)
    {
        LL_INFOS("Avatar") << self_av_string() << "HP " << index() << " polling, done status: " << completed << " timed out " << timed_out
                << " elapsed " << mWaitTime.getElapsedTimeF32() << LL_ENDL;

        mFired = true;

        if (timed_out)
        {
            LL_WARNS() << self_av_string() << "Exceeded max wait time for wearables, updating appearance based on what has arrived" << LL_ENDL;
        }

        onFetchCompletion();
    }
    return done;
}

void recovered_item_link_cb(const LLUUID& item_id, LLWearableType::EType type, LLViewerWearable *wearable, LLWearableHoldingPattern* holder)
{
    if (!holder->isMostRecent())
    {
        LL_WARNS() << "HP " << holder->index() << " skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
        // runway skip here?
    }

    LL_INFOS("Avatar") << "HP " << holder->index() << " recovered item link for type " << type << LL_ENDL;
    holder->eraseTypeToLink(type);
    // Add wearable to FoundData for actual wearing
    LLViewerInventoryItem *item = gInventory.getItem(item_id);
    LLViewerInventoryItem *linked_item = item ? item->getLinkedItem() : NULL;

    if (linked_item)
    {
        gInventory.addChangedMask(LLInventoryObserver::LABEL, linked_item->getUUID());

        if (item)
        {
            LLFoundData found(linked_item->getUUID(),
                              linked_item->getAssetUUID(),
                              linked_item->getName(),
                              linked_item->getType(),
                              linked_item->isWearableType() ? linked_item->getWearableType() : LLWearableType::WT_INVALID,
                              true // is replacement
                );
            found.mWearable = wearable;
            holder->getFoundList().push_front(found);
        }
        else
        {
            LL_WARNS() << self_av_string() << "inventory link not found for recovered wearable" << LL_ENDL;
        }
    }
    else
    {
        LL_WARNS() << self_av_string() << "HP " << holder->index() << " inventory link not found for recovered wearable" << LL_ENDL;
    }
}

void recovered_item_cb(const LLUUID& item_id, LLWearableType::EType type, LLViewerWearable *wearable, LLWearableHoldingPattern* holder)
{
    if (!holder->isMostRecent())
    {
        // runway skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    LL_DEBUGS("Avatar") << self_av_string() << "Recovered item for type " << type << LL_ENDL;
    LLConstPointer<LLInventoryObject> itemp = gInventory.getItem(item_id);
    wearable->setItemID(item_id);
    holder->eraseTypeToRecover(type);
    llassert(itemp);
    if (itemp)
    {
        LLPointer<LLInventoryCallback> cb = new LLBoostFuncInventoryCallback(boost::bind(recovered_item_link_cb,_1,type,wearable,holder));

        link_inventory_object(LLAppearanceMgr::instance().getCOF(), itemp, cb);
    }
}

void LLWearableHoldingPattern::recoverMissingWearable(LLWearableType::EType type)
{
    if (!isMostRecent())
    {
        // runway skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

        // Try to recover by replacing missing wearable with a new one.
    LLNotificationsUtil::add("ReplacedMissingWearable");
    LL_DEBUGS("Avatar") << "Wearable of type '" << LLWearableType::getInstance()->getTypeName(type)
                << "' could not be downloaded.  Replaced inventory item with default wearable." << LL_ENDL;
    LLViewerWearable* wearable = LLWearableList::instance().createNewWearable(type, gAgentAvatarp);

    // Add a new one in the lost and found folder.
    const LLUUID lost_and_found_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_LOST_AND_FOUND);
    LLPointer<LLInventoryCallback> cb = new LLBoostFuncInventoryCallback(boost::bind(recovered_item_cb,_1,type,wearable,this));

    create_inventory_wearable(gAgent.getID(),
                          gAgent.getSessionID(),
                          lost_and_found_id,
                          wearable->getTransactionID(),
                          wearable->getName(),
                          wearable->getDescription(),
                          wearable->getAssetType(),
                          wearable->getType(),
                          wearable->getPermissions().getMaskNextOwner(),
                          cb);
}

bool LLWearableHoldingPattern::isMissingCompleted()
{
    return mTypesToLink.size()==0 && mTypesToRecover.size()==0;
}

void LLWearableHoldingPattern::clearCOFLinksForMissingWearables()
{
    for (found_list_t::iterator it = getFoundList().begin(); it != getFoundList().end(); ++it)
    {
        LLFoundData &data = *it;
        if ((data.mWearableType < LLWearableType::WT_COUNT) && (!data.mWearable))
        {
            // Wearable link that was never resolved; remove links to it from COF
            LL_INFOS("Avatar") << self_av_string() << "HP " << index() << " removing link for unresolved item " << data.mItemID.asString() << LL_ENDL;
            LLAppearanceMgr::instance().removeCOFItemLinks(data.mItemID);
        }
    }
}

bool LLWearableHoldingPattern::pollMissingWearables()
{
    if (!isMostRecent())
    {
        // runway skip here?
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    bool timed_out = isTimedOut();
    bool missing_completed = isMissingCompleted();
    bool done = timed_out || missing_completed;

    if (!done)
    {
        LL_INFOS("Avatar") << self_av_string() << "HP " << index() << " polling missing wearables, waiting for items " << mTypesToRecover.size()
                << " links " << mTypesToLink.size()
                << " wearables, timed out " << timed_out
                << " elapsed " << mWaitTime.getElapsedTimeF32()
                << " done " << done << LL_ENDL;
    }

    if (done)
    {
        if (isMostRecent())
        {
            selfStopPhase("get_missing_wearables_2");
        }

        gAgentAvatarp->debugWearablesLoaded();

        // BAP - if we don't call clearCOFLinksForMissingWearables()
        // here, we won't have to add the link back in later if the
        // wearable arrives late.  This is to avoid corruption of
        // wearable ordering info.  Also has the effect of making
        // unworn item links visible in the COF under some
        // circumstances.

        //clearCOFLinksForMissingWearables();
        onAllComplete();
    }
    return done;
}

// Handle wearables that arrived after the timeout period expired.
void LLWearableHoldingPattern::handleLateArrivals()
{
    // Only safe to run if we have previously finished the missing
    // wearables and other processing - otherwise we could be in some
    // intermediate state - but have not been superceded by a later
    // outfit change request.
    if (mLateArrivals.size() == 0)
    {
        // Nothing to process.
        return;
    }
    if (!isMostRecent())
    {
        LL_WARNS() << self_av_string() << "Late arrivals not handled - outfit change no longer valid" << LL_ENDL;
    }
    if (!mIsAllComplete)
    {
        LL_WARNS() << self_av_string() << "Late arrivals not handled - in middle of missing wearables processing" << LL_ENDL;
    }

    LL_INFOS("Avatar") << self_av_string() << "HP " << index() << " need to handle " << mLateArrivals.size() << " late arriving wearables" << LL_ENDL;

    // Update mFoundList using late-arriving wearables.
    std::set<LLWearableType::EType> replaced_types;
    for (LLWearableHoldingPattern::found_list_t::iterator iter = getFoundList().begin();
         iter != getFoundList().end(); ++iter)
    {
        LLFoundData& data = *iter;
        for (std::set<LLViewerWearable*>::iterator wear_it = mLateArrivals.begin();
             wear_it != mLateArrivals.end();
             ++wear_it)
        {
            LLViewerWearable *wearable = *wear_it;

            if(wearable->getAssetID() == data.mAssetID)
            {
                data.mWearable = wearable;

                replaced_types.insert(data.mWearableType);

                // BAP - if we didn't call
                // clearCOFLinksForMissingWearables() earlier, we
                // don't need to restore the link here.  Fixes
                // wearable ordering problems.

                // LLAppearanceMgr::instance().addCOFItemLink(data.mItemID,false);

                // BAP failing this means inventory or asset server
                // are corrupted in a way we don't handle.
                llassert((data.mWearableType < LLWearableType::WT_COUNT) && (wearable->getType() == data.mWearableType));
                break;
            }
        }
    }

    // Remove COF links for any default wearables previously used to replace the late arrivals.
    // All this pussyfooting around with a while loop and explicit
    // iterator incrementing is to allow removing items from the list
    // without clobbering the iterator we're using to navigate.
    LLWearableHoldingPattern::found_list_t::iterator iter = getFoundList().begin();
    while (iter != getFoundList().end())
    {
        LLFoundData& data = *iter;

        // If an item of this type has recently shown up, removed the corresponding replacement wearable from COF.
        if (data.mWearable && data.mIsReplacement &&
            replaced_types.find(data.mWearableType) != replaced_types.end())
        {
            LLAppearanceMgr::instance().removeCOFItemLinks(data.mItemID);
            std::list<LLFoundData>::iterator clobber_ator = iter;
            ++iter;
            getFoundList().erase(clobber_ator);
        }
        else
        {
            ++iter;
        }
    }

    // Clear contents of late arrivals.
    mLateArrivals.clear();

    // Update appearance based on mFoundList
    LLAppearanceMgr::instance().updateAgentWearables(this);
}

void LLWearableHoldingPattern::resetTime(F32 timeout)
{
    mWaitTime.reset();
    mWaitTime.setTimerExpirySec(timeout);
}

void LLWearableHoldingPattern::onWearableAssetFetch(LLViewerWearable *wearable)
{
    if (!isMostRecent())
    {
        LL_WARNS() << self_av_string() << "skipping because LLWearableHolding pattern is invalid (superceded by later outfit request)" << LL_ENDL;
    }

    mResolved += 1;  // just counting callbacks, not successes.
    LL_DEBUGS("Avatar") << self_av_string() << "HP " << index() << " resolved " << mResolved << "/" << getFoundList().size() << LL_ENDL;
    if (!wearable)
    {
        LL_WARNS() << self_av_string() << "no wearable found" << LL_ENDL;
    }

    if (mFired)
    {
        LL_WARNS() << self_av_string() << "called after holder fired" << LL_ENDL;
        if (wearable)
        {
            mLateArrivals.insert(wearable);
            if (mIsAllComplete)
            {
                handleLateArrivals();
            }
        }
        return;
    }

    if (!wearable)
    {
        return;
    }

    U32 use_count = 0;
    for (LLWearableHoldingPattern::found_list_t::iterator iter = getFoundList().begin();
        iter != getFoundList().end(); ++iter)
    {
        LLFoundData& data = *iter;
        if (wearable->getAssetID() == data.mAssetID)
        {
            // Failing this means inventory or asset server are corrupted in a way we don't handle.
            if ((data.mWearableType >= LLWearableType::WT_COUNT) || (wearable->getType() != data.mWearableType))
            {
                LL_WARNS() << self_av_string() << "recovered wearable but type invalid. inventory wearable type: " << data.mWearableType << " asset wearable type: " << wearable->getType() << LL_ENDL;
                break;
            }

            if (use_count == 0)
            {
                data.mWearable = wearable;
                use_count++;
            }
            else
            {
                LLViewerInventoryItem* wearable_item = gInventory.getItem(data.mItemID);
                if (wearable_item && wearable_item->isFinished() && wearable_item->getPermissions().allowModifyBy(gAgentID))
                {
                    // We can't edit and do some other interactions with same asset twice, copy it
                    // Note: can't update incomplete items. Usually attached from previous viewer build, but
                    // consider adding fetch and completion callback
                    LLViewerWearable* new_wearable = LLWearableList::instance().createCopy(wearable, wearable->getName());
                    data.mWearable = new_wearable;
                    data.mAssetID = new_wearable->getAssetID();

                    // Update existing inventory item
                    wearable_item->setAssetUUID(new_wearable->getAssetID());
                    wearable_item->setTransactionID(new_wearable->getTransactionID());
                    gInventory.updateItem(wearable_item, LLInventoryObserver::INTERNAL);
                    wearable_item->updateServer(false);

                    use_count++;
                }
                else
                {
                    // Note: technically a bug, LLViewerWearable can identify only one item id at a time,
                    // yet we are tying it to multiple items here.
                    // LLViewerWearable need to support more then one item.
                    LL_WARNS() << "Same LLViewerWearable is used by multiple items! " << wearable->getAssetID() << LL_ENDL;
                    data.mWearable = wearable;
                }
            }
        }
    }

    if (use_count > 1)
    {
        LL_WARNS() << "Copying wearable, multiple asset id uses! " << wearable->getAssetID() << LL_ENDL;
        gInventory.notifyObservers();
    }
}

static void onWearableAssetFetch(LLViewerWearable* wearable, void* data)
{
    LLWearableHoldingPattern* holder = (LLWearableHoldingPattern*)data;
    holder->onWearableAssetFetch(wearable);
}


static void removeDuplicateItems(LLInventoryModel::item_array_t& items)
{
    LLInventoryModel::item_array_t new_items;
    std::set<LLUUID> items_seen;
    std::deque<LLViewerInventoryItem*> tmp_list;
    // Traverse from the front and keep the first of each item
    // encountered, so we actually keep the *last* of each duplicate
    // item.  This is needed to give the right priority when adding
    // duplicate items to an existing outfit.
    for (S32 i = static_cast<S32>(items.size()) - 1; i >= 0; i--)
    {
        LLViewerInventoryItem *item = items.at(i);
        LLUUID item_id = item->getLinkedUUID();
        if (items_seen.find(item_id)!=items_seen.end())
            continue;
        items_seen.insert(item_id);
        tmp_list.push_front(item);
    }
    for (std::deque<LLViewerInventoryItem*>::iterator it = tmp_list.begin();
         it != tmp_list.end();
         ++it)
    {
        new_items.push_back(*it);
    }
    items = new_items;
}

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

const std::string LLAppearanceMgr::sExpectedTextureName = "OutfitPreview";

const LLUUID LLAppearanceMgr::getCOF() const
{
    return mCOFID;
}

S32 LLAppearanceMgr::getCOFVersion() const
{
    LLViewerInventoryCategory *cof = gInventory.getCategory(getCOF());
    if (cof)
    {
        return cof->getVersion();
    }
    else
    {
        return LLViewerInventoryCategory::VERSION_UNKNOWN;
    }
}

void LLAppearanceMgr::initCOFID()
{
    mCOFID = gInventory.findCategoryUUIDForType(LLFolderType::FT_CURRENT_OUTFIT);
}

const LLViewerInventoryItem* LLAppearanceMgr::getBaseOutfitLink()
{
    const LLUUID& current_outfit_cat = getCOF();
    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    // Can't search on FT_OUTFIT since links to categories return FT_CATEGORY for type since they don't
    // return preferred type.
    LLIsType is_category( LLAssetType::AT_CATEGORY );
    gInventory.collectDescendentsIf(current_outfit_cat,
                                    cat_array,
                                    item_array,
                                    false,
                                    is_category);
    for (LLInventoryModel::item_array_t::const_iterator iter = item_array.begin();
         iter != item_array.end();
         iter++)
    {
        const LLViewerInventoryItem *item = (*iter);
        const LLViewerInventoryCategory *cat = item->getLinkedCategory();
        if (cat && cat->getPreferredType() == LLFolderType::FT_OUTFIT)
        {
            const LLUUID parent_id = cat->getParentUUID();
            LLViewerInventoryCategory*  parent_cat =  gInventory.getCategory(parent_id);
            // if base outfit moved to trash it means that we don't have base outfit
            if (parent_cat != NULL && parent_cat->getPreferredType() == LLFolderType::FT_TRASH)
            {
                return NULL;
            }
            return item;
        }
    }
    return NULL;
}

bool LLAppearanceMgr::getBaseOutfitName(std::string& name)
{
    const LLViewerInventoryItem* outfit_link = getBaseOutfitLink();
    if(outfit_link)
    {
        const LLViewerInventoryCategory *cat = outfit_link->getLinkedCategory();
        if (cat)
        {
            name = cat->getName();
            return true;
        }
    }
    return false;
}

const LLUUID LLAppearanceMgr::getBaseOutfitUUID()
{
    const LLViewerInventoryItem* outfit_link = getBaseOutfitLink();
    if (!outfit_link || !outfit_link->getIsLinkType()) return LLUUID::null;

    const LLViewerInventoryCategory* outfit_cat = outfit_link->getLinkedCategory();
    if (!outfit_cat) return LLUUID::null;

    if (outfit_cat->getPreferredType() != LLFolderType::FT_OUTFIT)
    {
        LL_WARNS() << "Expected outfit type:" << LLFolderType::FT_OUTFIT << " but got type:" << outfit_cat->getType() << " for folder name:" << outfit_cat->getName() << LL_ENDL;
        return LLUUID::null;
    }

    return outfit_cat->getUUID();
}

void wear_on_avatar_cb(const LLUUID& inv_item, bool do_replace = false)
{
    if (inv_item.isNull())
        return;

    LLViewerInventoryItem *item = gInventory.getItem(inv_item);
    if (item)
    {
        LLAppearanceMgr::instance().wearItemOnAvatar(inv_item, true, do_replace);
    }
}

void LLAppearanceMgr::wearItemsOnAvatar(const uuid_vec_t& item_ids_to_wear,
                                        bool do_update,
                                        bool replace,
                                        LLPointer<LLInventoryCallback> cb)
{
    LL_DEBUGS("UIUsage") << "wearItemsOnAvatar" << LL_ENDL;
    LLUIUsage::instance().logCommand("Avatar.WearItem");

    bool first = true;

    LLInventoryObject::const_object_list_t items_to_link;

    for (uuid_vec_t::const_iterator it = item_ids_to_wear.begin();
         it != item_ids_to_wear.end();
         ++it)
    {
        replace = first && replace;
        first = false;

        const LLUUID& item_id_to_wear = *it;

        if (item_id_to_wear.isNull())
        {
            LL_DEBUGS("Avatar") << "null id " << item_id_to_wear << LL_ENDL;
            continue;
        }

        LLViewerInventoryItem* item_to_wear = gInventory.getItem(item_id_to_wear);
        if (!item_to_wear)
        {
            LL_DEBUGS("Avatar") << "inventory item not found for id " << item_id_to_wear << LL_ENDL;
            continue;
        }

        if (gInventory.isObjectDescendentOf(item_to_wear->getUUID(), gInventory.getLibraryRootFolderID()))
        {
            LL_DEBUGS("Avatar") << "inventory item in library, will copy and wear "
                                << item_to_wear->getName() << " id " << item_id_to_wear << LL_ENDL;
            LLPointer<LLInventoryCallback> cb = new LLBoostFuncInventoryCallback(boost::bind(wear_on_avatar_cb,_1,replace));
            copy_inventory_item(gAgent.getID(), item_to_wear->getPermissions().getOwner(),
                                item_to_wear->getUUID(), LLUUID::null, std::string(), cb);
            continue;
        }
        else if (!gInventory.isObjectDescendentOf(item_to_wear->getUUID(), gInventory.getRootFolderID()))
        {
            // not in library and not in agent's inventory
            LL_DEBUGS("Avatar") << "inventory item not in user inventory or library, skipping "
                                << item_to_wear->getName() << " id " << item_id_to_wear << LL_ENDL;
            continue;
        }
        else if (gInventory.isObjectDescendentOf(item_to_wear->getUUID(), gInventory.findCategoryUUIDForType(LLFolderType::FT_TRASH)))
        {
            LLNotificationsUtil::add("CannotWearTrash");
            LL_DEBUGS("Avatar") << "inventory item is in trash, skipping "
                                << item_to_wear->getName() << " id " << item_id_to_wear << LL_ENDL;
            continue;
        }
        else if (isLinkedInCOF(item_to_wear->getUUID())) // EXT-84911
        {
            LL_DEBUGS("Avatar") << "inventory item is already in COF, skipping "
                                << item_to_wear->getName() << " id " << item_id_to_wear << LL_ENDL;
            continue;
        }

        switch (item_to_wear->getType())
        {
            case LLAssetType::AT_CLOTHING:
            {
                if (gAgentWearables.areWearablesLoaded())
                {
                    if (!cb && do_update)
                    {
                        cb = new LLUpdateAppearanceAndEditWearableOnDestroy(item_id_to_wear);
                    }
                    LLWearableType::EType type = item_to_wear->getWearableType();
                    S32 wearable_count = gAgentWearables.getWearableCount(type);
                    if ((replace && wearable_count != 0) || !gAgentWearables.canAddWearable(type))
                    {
                        LLUUID item_id = gAgentWearables.getWearableItemID(item_to_wear->getWearableType(),
                                                                           wearable_count-1);
                        removeCOFItemLinks(item_id, cb);
                    }

                    items_to_link.push_back(item_to_wear);
                }
            }
            break;

            case LLAssetType::AT_BODYPART:
            {
                // TODO: investigate wearables may not be loaded at this point EXT-8231

                // Remove the existing wearables of the same type.
                // Remove existing body parts anyway because we must not be able to wear e.g. two skins.
                removeCOFLinksOfType(item_to_wear->getWearableType());
                if (!cb && do_update)
                {
                    cb = new LLUpdateAppearanceAndEditWearableOnDestroy(item_id_to_wear);
                }
                items_to_link.push_back(item_to_wear);
            }
            break;

            case LLAssetType::AT_OBJECT:
            {
                rez_attachment(item_to_wear, NULL, replace);
            }
            break;

            default: continue;
        }
    }

    // Batch up COF link creation - more efficient if using AIS.
    if (items_to_link.size())
    {
        link_inventory_array(getCOF(), items_to_link, cb);
    }
}

void LLAppearanceMgr::wearItemOnAvatar(const LLUUID& item_id_to_wear,
                                       bool do_update,
                                       bool replace,
                                       LLPointer<LLInventoryCallback> cb)
{
    uuid_vec_t ids;
    ids.push_back(item_id_to_wear);
    wearItemsOnAvatar(ids, do_update, replace, cb);
}

// Update appearance from outfit folder.
void LLAppearanceMgr::changeOutfit(bool proceed, const LLUUID& category, bool append)
{
    if (!proceed)
        return;
    LLAppearanceMgr::instance().updateCOF(category,append);
}

void LLAppearanceMgr::replaceCurrentOutfit(const LLUUID& new_outfit)
{
    LLViewerInventoryCategory* cat = gInventory.getCategory(new_outfit);
    wearInventoryCategory(cat, false, false);
}

// Remove existing photo link from outfit folder.
void LLAppearanceMgr::removeOutfitPhoto(const LLUUID& outfit_id)
{
    LLInventoryModel::cat_array_t sub_cat_array;
    LLInventoryModel::item_array_t outfit_item_array;
    gInventory.collectDescendents(
        outfit_id,
        sub_cat_array,
        outfit_item_array,
        LLInventoryModel::EXCLUDE_TRASH);
    for (LLViewerInventoryItem* outfit_item : outfit_item_array)
    {
        LLViewerInventoryItem* linked_item = outfit_item->getLinkedItem();
        if (linked_item != NULL)
        {
            if (linked_item->getActualType() == LLAssetType::AT_TEXTURE)
            {
                gInventory.removeItem(outfit_item->getUUID());
            }
        }
        else if (outfit_item->getActualType() == LLAssetType::AT_TEXTURE)
        {
            gInventory.removeItem(outfit_item->getUUID());
        }
    }
}

// Open outfit renaming dialog.
void LLAppearanceMgr::renameOutfit(const LLUUID& outfit_id)
{
    LLViewerInventoryCategory* cat = gInventory.getCategory(outfit_id);
    if (!cat)
    {
        return;
    }

    LLSD args;
    args["NAME"] = cat->getName();

    LLSD payload;
    payload["cat_id"] = outfit_id;

    LLNotificationsUtil::add("RenameOutfit", args, payload, boost::bind(onOutfitRename, _1, _2));
}

// User typed new outfit name.
// static
void LLAppearanceMgr::onOutfitRename(const LLSD& notification, const LLSD& response)
{
    S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
    if (option != 0) return; // canceled

    std::string outfit_name = response["new_name"].asString();
    LLStringUtil::trim(outfit_name);
    if (!outfit_name.empty())
    {
        LLUUID cat_id = notification["payload"]["cat_id"].asUUID();
        rename_category(&gInventory, cat_id, outfit_name);
    }
}

void LLAppearanceMgr::setOutfitLocked(bool locked)
{
    if (mOutfitLocked == locked)
    {
        return;
    }

    mOutfitLocked = locked;
    if (locked)
    {
        mUnlockOutfitTimer->reset();
        mUnlockOutfitTimer->start();
    }
    else
    {
        mUnlockOutfitTimer->stop();
    }

    LLOutfitObserver::instance().notifyOutfitLockChanged();
}

void LLAppearanceMgr::addCategoryToCurrentOutfit(const LLUUID& cat_id)
{
    LLViewerInventoryCategory* cat = gInventory.getCategory(cat_id);
    wearInventoryCategory(cat, false, true);
}

void LLAppearanceMgr::takeOffOutfit(const LLUUID& cat_id)
{
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLFindWearablesEx collector(/*is_worn=*/ true, /*include_body_parts=*/ false);

    gInventory.collectDescendentsIf(cat_id, cats, items, false, collector);

    LLInventoryModel::item_array_t::const_iterator it = items.begin();
    const LLInventoryModel::item_array_t::const_iterator it_end = items.end();
    uuid_vec_t uuids_to_remove;
    for( ; it_end != it; ++it)
    {
        LLViewerInventoryItem* item = *it;
        uuids_to_remove.push_back(item->getUUID());
    }
    removeItemsFromAvatar(uuids_to_remove);

    // deactivate all gestures in the outfit folder
    LLInventoryModel::item_array_t gest_items;
    getDescendentsOfAssetType(cat_id, gest_items, LLAssetType::AT_GESTURE);
    for(S32 i = 0; i  < gest_items.size(); ++i)
    {
        LLViewerInventoryItem *gest_item = gest_items[i];
        if ( LLGestureMgr::instance().isGestureActive( gest_item->getLinkedUUID()) )
        {
            LLGestureMgr::instance().deactivateGesture( gest_item->getLinkedUUID() );
        }
    }
}

// Create a copy of src_id + contents as a subfolder of dst_id.
void LLAppearanceMgr::shallowCopyCategory(const LLUUID& src_id, const LLUUID& dst_id,
                                              LLPointer<LLInventoryCallback> cb)
{
    LLInventoryCategory *src_cat = gInventory.getCategory(src_id);
    if (!src_cat)
    {
        LL_WARNS() << "folder not found for src " << src_id.asString() << LL_ENDL;
        return;
    }
    LL_INFOS() << "starting, src_id " << src_id << " name " << src_cat->getName() << " dst_id " << dst_id << LL_ENDL;
    LLUUID parent_id = dst_id;
    if(parent_id.isNull())
    {
        parent_id = gInventory.getRootFolderID();
    }
    gInventory.createNewCategory(
        parent_id,
        LLFolderType::FT_NONE,
        src_cat->getName(),
        [src_id, cb](const LLUUID &new_id)
    {
        LLAppearanceMgr::getInstance()->shallowCopyCategoryContents(src_id, new_id, cb);

        gInventory.notifyObservers();
    },
        src_cat->getThumbnailUUID()
    );
}

void LLAppearanceMgr::slamCategoryLinks(const LLUUID& src_id, const LLUUID& dst_id,
                                        bool include_folder_links, LLPointer<LLInventoryCallback> cb)
{
    LLInventoryModel::cat_array_t* cats;
    LLInventoryModel::item_array_t* items;
    LLSD contents = LLSD::emptyArray();
    gInventory.getDirectDescendentsOf(src_id, cats, items);
    if (!cats || !items)
    {
        // NULL means the call failed -- cats/items map doesn't exist (note: this does NOT mean
        // that the cat just doesn't have any items or subfolders).
        LLViewerInventoryCategory* category = gInventory.getCategory(src_id);
        if (category)
        {
            LL_WARNS() << "Category '" << category->getName() << "' descendents corrupted, linking content failed." << LL_ENDL;
        }
        else
        {
            LL_WARNS() << "Category could not be retrieved, linking content failed." << LL_ENDL;
        }
        llassert(cats != NULL && items != NULL);

        return;
    }

    LL_INFOS() << "copying " << items->size() << " items" << LL_ENDL;
    for (LLInventoryModel::item_array_t::const_iterator iter = items->begin();
         iter != items->end();
         ++iter)
    {
        const LLViewerInventoryItem* item = (*iter);
        switch (item->getActualType())
        {
            case LLAssetType::AT_LINK:
            {
                LL_DEBUGS("Avatar") << "linking inventory item " << item->getName() << LL_ENDL;
                //getActualDescription() is used for a new description
                //to propagate ordering information saved in descriptions of links
                LLSD item_contents;
                item_contents["name"] = item->getName();
                item_contents["desc"] = item->getActualDescription();
                item_contents["linked_id"] = item->getLinkedUUID();
                item_contents["type"] = LLAssetType::AT_LINK;
                contents.append(item_contents);
                break;
            }
            case LLAssetType::AT_LINK_FOLDER:
            {
                LLViewerInventoryCategory *catp = item->getLinkedCategory();
                if (catp && include_folder_links)
                {
                    LL_DEBUGS("Avatar") << "linking inventory folder " << item->getName() << LL_ENDL;
                    LLSD base_contents;
                    base_contents["name"] = catp->getName();
                    base_contents["desc"] = ""; // categories don't have descriptions.
                    base_contents["linked_id"] = catp->getLinkedUUID();
                    base_contents["type"] = LLAssetType::AT_LINK_FOLDER;
                    contents.append(base_contents);
                }
                break;
            }
            default:
            {
                // Linux refuses to compile unless all possible enums are handled. Really, Linux?
                break;
            }
        }
    }
    slam_inventory_folder(dst_id, contents, cb);
}
// Copy contents of src_id to dst_id.
void LLAppearanceMgr::shallowCopyCategoryContents(const LLUUID& src_id, const LLUUID& dst_id,
                                                      LLPointer<LLInventoryCallback> cb)
{
    LLInventoryModel::cat_array_t* cats;
    LLInventoryModel::item_array_t* items;
    gInventory.getDirectDescendentsOf(src_id, cats, items);
    LL_INFOS() << "copying " << items->size() << " items" << LL_ENDL;
    LLInventoryObject::const_object_list_t link_array;
    for (LLInventoryModel::item_array_t::const_iterator iter = items->begin();
         iter != items->end();
         ++iter)
    {
        const LLViewerInventoryItem* item = (*iter);
        switch (item->getActualType())
        {
            case LLAssetType::AT_LINK:
            {
                LL_DEBUGS("Avatar") << "linking inventory item " << item->getName() << LL_ENDL;
                link_array.push_back(LLConstPointer<LLInventoryObject>(item));
                break;
            }
            case LLAssetType::AT_LINK_FOLDER:
            {
                LLViewerInventoryCategory *catp = item->getLinkedCategory();
                // Skip copying outfit links.
                if (catp && catp->getPreferredType() != LLFolderType::FT_OUTFIT)
                {
                    LL_DEBUGS("Avatar") << "linking inventory folder " << item->getName() << LL_ENDL;
                    link_array.push_back(LLConstPointer<LLInventoryObject>(item));
                }
                break;
            }
            case LLAssetType::AT_CLOTHING:
            case LLAssetType::AT_OBJECT:
            case LLAssetType::AT_BODYPART:
            case LLAssetType::AT_GESTURE:
            {
                LL_DEBUGS("Avatar") << "copying inventory item " << item->getName() << LL_ENDL;
                copy_inventory_item(gAgent.getID(),
                                    item->getPermissions().getOwner(),
                                    item->getUUID(),
                                    dst_id,
                                    item->getName(),
                                    cb);
                break;
            }
            default:
                // Ignore non-outfit asset types
                break;
        }
    }
    if (!link_array.empty())
    {
        link_inventory_array(dst_id, link_array, cb);
    }
}

bool LLAppearanceMgr::getCanMakeFolderIntoOutfit(const LLUUID& folder_id)
{
    // These are the wearable items that are required for considering this
    // folder as containing a complete outfit.
    U32 required_wearables = 0;
    required_wearables |= 1LL << LLWearableType::WT_SHAPE;
    required_wearables |= 1LL << LLWearableType::WT_SKIN;
    required_wearables |= 1LL << LLWearableType::WT_HAIR;
    required_wearables |= 1LL << LLWearableType::WT_EYES;

    // These are the wearables that the folder actually contains.
    U32 folder_wearables = 0;
    LLInventoryModel::cat_array_t* cats;
    LLInventoryModel::item_array_t* items;
    gInventory.getDirectDescendentsOf(folder_id, cats, items);
    for (LLInventoryModel::item_array_t::const_iterator iter = items->begin();
         iter != items->end();
         ++iter)
    {
        const LLViewerInventoryItem* item = (*iter);
        if (item->isWearableType())
        {
            const LLWearableType::EType wearable_type = item->getWearableType();
            folder_wearables |= 1LL << wearable_type;
        }
    }

    // If the folder contains the required wearables, return true.
    return ((required_wearables & folder_wearables) == required_wearables);
}

bool LLAppearanceMgr::getCanRemoveOutfit(const LLUUID& outfit_cat_id)
{
    // Disallow removing the base outfit.
    if (outfit_cat_id == getBaseOutfitUUID())
    {
        return false;
    }

    // Check if the outfit folder itself is removable.
    if (!get_is_category_removable(&gInventory, outfit_cat_id))
    {
        return false;
    }

    // Check for the folder's non-removable descendants.
    LLFindNonRemovableObjects filter_non_removable;
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    gInventory.collectDescendentsIf(outfit_cat_id, cats, items, false, filter_non_removable);
    if (!cats.empty() || !items.empty())
    {
        return false;
    }

    return true;
}

// static
bool LLAppearanceMgr::getCanRemoveFromCOF(const LLUUID& outfit_cat_id)
{
    if (gAgentWearables.isCOFChangeInProgress())
    {
        return false;
    }
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLFindWearablesEx is_worn(/*is_worn=*/ true, /*include_body_parts=*/ false);
    gInventory.collectDescendentsIf(outfit_cat_id,
        cats,
        items,
        LLInventoryModel::EXCLUDE_TRASH,
        is_worn);
    return items.size() > 0;
}

// static
bool LLAppearanceMgr::getCanAddToCOF(const LLUUID& outfit_cat_id)
{
    if (gAgentWearables.isCOFChangeInProgress())
    {
        return false;
    }

    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLFindWearablesEx not_worn(/*is_worn=*/ false, /*include_body_parts=*/ false);
    gInventory.collectDescendentsIf(outfit_cat_id,
        cats,
        items,
        LLInventoryModel::EXCLUDE_TRASH,
        not_worn);

    return items.size() > 0;
}

bool LLAppearanceMgr::getCanReplaceCOF(const LLUUID& outfit_cat_id)
{
    // Don't allow wearing anything while we're changing appearance.
    if (gAgentWearables.isCOFChangeInProgress())
    {
        return false;
    }

    // Check whether it's the base outfit.
    if (outfit_cat_id.isNull())
    {
        return false;
    }

    // Check whether the outfit contains any wearables
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLFindWearables is_wearable;
    gInventory.collectDescendentsIf(outfit_cat_id,
        cats,
        items,
        LLInventoryModel::EXCLUDE_TRASH,
        is_wearable);

    return items.size() > 0;
}

// Moved from LLWearableList::ContextMenu for wider utility.
bool LLAppearanceMgr::canAddWearables(const uuid_vec_t& item_ids) const
{
    // TODO: investigate wearables may not be loaded at this point EXT-8231

    U32 n_objects = 0;
    U32 n_clothes = 0;

    // Count given clothes (by wearable type) and objects.
    for (uuid_vec_t::const_iterator it = item_ids.begin(); it != item_ids.end(); ++it)
    {
        const LLViewerInventoryItem* item = gInventory.getItem(*it);
        if (!item)
        {
            return false;
        }

        if (item->getType() == LLAssetType::AT_OBJECT)
        {
            ++n_objects;
        }
        else if (item->getType() == LLAssetType::AT_CLOTHING)
        {
            ++n_clothes;
        }
        else if (item->getType() == LLAssetType::AT_BODYPART || item->getType() == LLAssetType::AT_GESTURE)
        {
            return isAgentAvatarValid();
        }
        else
        {
            LL_WARNS() << "Unexpected wearable type" << LL_ENDL;
            return false;
        }
    }

    // Check whether we can add all the objects.
    if (!isAgentAvatarValid() || !gAgentAvatarp->canAttachMoreObjects(n_objects))
    {
        return false;
    }

    // Check whether we can add all the clothes.
    U32 sum_clothes = n_clothes + gAgentWearables.getClothingLayerCount();
    return sum_clothes <= LLAgentWearables::MAX_CLOTHING_LAYERS;
}

void LLAppearanceMgr::purgeBaseOutfitLink(const LLUUID& category, LLPointer<LLInventoryCallback> cb)
{
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    gInventory.collectDescendents(category, cats, items,
                                  LLInventoryModel::EXCLUDE_TRASH);
    for (S32 i = 0; i < items.size(); ++i)
    {
        LLViewerInventoryItem *item = items.at(i);
        if (item->getActualType() != LLAssetType::AT_LINK_FOLDER)
            continue;
        LLViewerInventoryCategory* catp = item->getLinkedCategory();
        if(catp && catp->getPreferredType() == LLFolderType::FT_OUTFIT)
        {
            remove_inventory_item(item->getUUID(), cb);
        }
    }
}

// Keep the last N wearables of each type.  For viewer 2.0, N is 1 for
// both body parts and clothing items.
void LLAppearanceMgr::filterWearableItems(
    LLInventoryModel::item_array_t& items, S32 max_per_type, S32 max_total)
{
    // Restrict by max total items first.
    if ((max_total > 0) && (items.size() > max_total))
    {
        LLInventoryModel::item_array_t items_to_keep;
        for (S32 i=0; i<max_total; i++)
        {
            items_to_keep.push_back(items[i]);
        }
        items = items_to_keep;
    }

    if (max_per_type > 0)
    {
        // Divvy items into arrays by wearable type.
        std::vector<LLInventoryModel::item_array_t> items_by_type(LLWearableType::WT_COUNT);
        divvyWearablesByType(items, items_by_type);

        // rebuild items list, retaining the last max_per_type of each array
        items.clear();
        for (S32 i=0; i<LLWearableType::WT_COUNT; i++)
        {
            auto size = items_by_type[i].size();
            if (size <= 0)
                continue;
            auto start_index = llmax(0,size-max_per_type);
            for (size_t j = start_index; j<size; j++)
            {
                items.push_back(items_by_type[i][j]);
            }
        }
    }
}

void LLAppearanceMgr::updateCOF(const LLUUID& category, bool append)
{
    LLViewerInventoryCategory *pcat = gInventory.getCategory(category);
    if (!pcat)
    {
        LL_WARNS() << "no category found for id " << category << LL_ENDL;
        return;
    }
    LL_INFOS("Avatar") << self_av_string() << "starting, cat '" << (pcat ? pcat->getName() : "[UNKNOWN]") << "'" << LL_ENDL;

    const LLUUID cof = getCOF();

    // Deactivate currently active gestures in the COF, if replacing outfit
    if (!append)
    {
        LLInventoryModel::item_array_t gest_items;
        getDescendentsOfAssetType(cof, gest_items, LLAssetType::AT_GESTURE);
        for(S32 i = 0; i  < gest_items.size(); ++i)
        {
            LLViewerInventoryItem *gest_item = gest_items.at(i);
            if ( LLGestureMgr::instance().isGestureActive( gest_item->getLinkedUUID()) )
            {
                LLGestureMgr::instance().deactivateGesture( gest_item->getLinkedUUID() );
            }
        }
    }

    // Collect and filter descendents to determine new COF contents.

    // - Body parts: always include COF contents as a fallback in case any
    // required parts are missing.
    // Preserve body parts from COF if appending.
    LLInventoryModel::item_array_t body_items;
    getDescendentsOfAssetType(cof, body_items, LLAssetType::AT_BODYPART);
    getDescendentsOfAssetType(category, body_items, LLAssetType::AT_BODYPART);
    if (append)
        reverse(body_items.begin(), body_items.end());
    // Reduce body items to max of one per type.
    removeDuplicateItems(body_items);
    filterWearableItems(body_items, 1, 0);

    // - Wearables: include COF contents only if appending.
    LLInventoryModel::item_array_t wear_items;
    if (append)
        getDescendentsOfAssetType(cof, wear_items, LLAssetType::AT_CLOTHING);
    getDescendentsOfAssetType(category, wear_items, LLAssetType::AT_CLOTHING);
    // Reduce wearables to max of one per type.
    removeDuplicateItems(wear_items);
    filterWearableItems(wear_items, 0, LLAgentWearables::MAX_CLOTHING_LAYERS);

    // - Attachments: include COF contents only if appending.
    LLInventoryModel::item_array_t obj_items;
    if (append)
        getDescendentsOfAssetType(cof, obj_items, LLAssetType::AT_OBJECT);
    getDescendentsOfAssetType(category, obj_items, LLAssetType::AT_OBJECT);
    removeDuplicateItems(obj_items);

    // - Gestures: include COF contents only if appending.
    LLInventoryModel::item_array_t gest_items;
    if (append)
        getDescendentsOfAssetType(cof, gest_items, LLAssetType::AT_GESTURE);
    getDescendentsOfAssetType(category, gest_items, LLAssetType::AT_GESTURE);
    removeDuplicateItems(gest_items);

    // Create links to new COF contents.
    LLInventoryModel::item_array_t all_items;
    std::copy(body_items.begin(), body_items.end(), std::back_inserter(all_items));
    std::copy(wear_items.begin(), wear_items.end(), std::back_inserter(all_items));
    std::copy(obj_items.begin(), obj_items.end(), std::back_inserter(all_items));
    std::copy(gest_items.begin(), gest_items.end(), std::back_inserter(all_items));

    // Find any wearables that need description set to enforce ordering.
    desc_map_t desc_map;
    getWearableOrderingDescUpdates(wear_items, desc_map);

    // Will link all the above items.
    // link_waiter enforce flags are false because we've already fixed everything up in updateCOF().
    LLPointer<LLInventoryCallback> link_waiter = new LLUpdateAppearanceOnDestroy(false,false);
    LLSD contents = LLSD::emptyArray();

    for (LLInventoryModel::item_array_t::const_iterator it = all_items.begin();
         it != all_items.end(); ++it)
    {
        LLSD item_contents;
        LLInventoryItem *item = *it;

        std::string desc;
        desc_map_t::const_iterator desc_iter = desc_map.find(item->getUUID());
        if (desc_iter != desc_map.end())
        {
            desc = desc_iter->second;
            LL_DEBUGS("Avatar") << item->getName() << " overriding desc to: " << desc
                                << " (was: " << item->getActualDescription() << ")" << LL_ENDL;
        }
        else
        {
            desc = item->getActualDescription();
        }

        item_contents["name"] = item->getName();
        item_contents["desc"] = desc;
        item_contents["linked_id"] = item->getLinkedUUID();
        item_contents["type"] = LLAssetType::AT_LINK;
        contents.append(item_contents);
    }
    const LLUUID& base_id = append ? getBaseOutfitUUID() : category;
    LLViewerInventoryCategory *base_cat = gInventory.getCategory(base_id);
    if (base_cat && (base_cat->getPreferredType() == LLFolderType::FT_OUTFIT))
    {
        LLSD base_contents;
        base_contents["name"] = base_cat->getName();
        base_contents["desc"] = "";
        base_contents["linked_id"] = base_cat->getLinkedUUID();
        base_contents["type"] = LLAssetType::AT_LINK_FOLDER;
        contents.append(base_contents);
    }
    if (gSavedSettings.getBOOL("DebugAvatarAppearanceMessage"))
    {
        dump_sequential_xml(gAgentAvatarp->getFullname() + "_slam_request", contents);
    }
    slam_inventory_folder(getCOF(), contents, link_waiter);

    LL_DEBUGS("Avatar") << self_av_string() << "waiting for LLUpdateAppearanceOnDestroy" << LL_ENDL;
}

void LLAppearanceMgr::updatePanelOutfitName(const std::string& name)
{
    LLSidepanelAppearance* panel_appearance =
        dynamic_cast<LLSidepanelAppearance *>(LLFloaterSidePanelContainer::getPanel("appearance"));
    if (panel_appearance)
    {
        panel_appearance->refreshCurrentOutfitName(name);
    }
}

void LLAppearanceMgr::createBaseOutfitLink(const LLUUID& category, LLPointer<LLInventoryCallback> link_waiter)
{
    const LLUUID cof = getCOF();
    LLViewerInventoryCategory* catp = gInventory.getCategory(category);
    std::string new_outfit_name = "";

    purgeBaseOutfitLink(cof, link_waiter);

    if (catp && catp->getPreferredType() == LLFolderType::FT_OUTFIT)
    {
        link_inventory_object(cof, catp, link_waiter);
        new_outfit_name = catp->getName();
    }

    updatePanelOutfitName(new_outfit_name);
}

void LLAppearanceMgr::updateAgentWearables(LLWearableHoldingPattern* holder)
{
    LL_DEBUGS("Avatar") << "updateAgentWearables()" << LL_ENDL;
    LLInventoryItem::item_array_t items;
    std::vector< LLViewerWearable* > wearables;
    wearables.reserve(32);

    // For each wearable type, find the wearables of that type.
    for( S32 i = 0; i < LLWearableType::WT_COUNT; i++ )
    {
        for (LLWearableHoldingPattern::found_list_t::iterator iter = holder->getFoundList().begin();
             iter != holder->getFoundList().end(); ++iter)
        {
            LLFoundData& data = *iter;
            LLViewerWearable* wearable = data.mWearable;
            if( wearable && ((S32)wearable->getType() == i) )
            {
                LLViewerInventoryItem* item = (LLViewerInventoryItem*)gInventory.getItem(data.mItemID);
                if( item && (item->getAssetUUID() == wearable->getAssetID()) )
                {
                    items.push_back(item);
                    wearables.push_back(wearable);
                }
            }
        }
    }

    if(wearables.size() > 0)
    {
        gAgentWearables.setWearableOutfit(items, wearables);
    }
}

S32 LLAppearanceMgr::countActiveHoldingPatterns()
{
    return LLWearableHoldingPattern::countActive();
}

static void remove_non_link_items(LLInventoryModel::item_array_t &items)
{
    LLInventoryModel::item_array_t pruned_items;
    for (LLInventoryModel::item_array_t::const_iterator iter = items.begin();
         iter != items.end();
         ++iter)
    {
        const LLViewerInventoryItem *item = (*iter);
        if (item && item->getIsLinkType())
        {
            pruned_items.push_back((*iter));
        }
    }
    items = pruned_items;
}

//a predicate for sorting inventory items by actual descriptions
bool sort_by_actual_description(const LLInventoryItem* item1, const LLInventoryItem* item2)
{
    if (!item1 || !item2)
    {
        LL_WARNS() << "either item1 or item2 is NULL" << LL_ENDL;
        return true;
    }

    return item1->getActualDescription() < item2->getActualDescription();
}

void item_array_diff(LLInventoryModel::item_array_t& full_list,
                     LLInventoryModel::item_array_t& keep_list,
                     LLInventoryModel::item_array_t& kill_list)

{
    for (LLInventoryModel::item_array_t::iterator it = full_list.begin();
         it != full_list.end();
         ++it)
    {
        LLViewerInventoryItem *item = *it;
        if (std::find(keep_list.begin(), keep_list.end(), item) == keep_list.end())
        {
            kill_list.push_back(item);
        }
    }
}

S32 LLAppearanceMgr::findExcessOrDuplicateItems(const LLUUID& cat_id,
                                                 LLAssetType::EType type,
                                                 S32 max_items_per_type,
                                                 S32 max_items_total,
                                                 LLInventoryObject::object_list_t& items_to_kill)
{
    S32 to_kill_count = 0;

    LLInventoryModel::item_array_t items;
    getDescendentsOfAssetType(cat_id, items, type);
    LLInventoryModel::item_array_t curr_items = items;
    removeDuplicateItems(items);
    if (max_items_per_type > 0 || max_items_total > 0)
    {
        filterWearableItems(items, max_items_per_type, max_items_total);
    }
    LLInventoryModel::item_array_t kill_items;
    item_array_diff(curr_items,items,kill_items);
    for (LLInventoryModel::item_array_t::iterator it = kill_items.begin();
         it != kill_items.end();
         ++it)
    {
        items_to_kill.push_back(LLPointer<LLInventoryObject>(*it));
        to_kill_count++;
    }
    return to_kill_count;
}


void LLAppearanceMgr::findAllExcessOrDuplicateItems(const LLUUID& cat_id,
                                                    LLInventoryObject::object_list_t& items_to_kill)
{
    findExcessOrDuplicateItems(cat_id,LLAssetType::AT_BODYPART,
                               1, 0, items_to_kill);
    findExcessOrDuplicateItems(cat_id,LLAssetType::AT_CLOTHING,
                               0, LLAgentWearables::MAX_CLOTHING_LAYERS, items_to_kill);
    findExcessOrDuplicateItems(cat_id,LLAssetType::AT_OBJECT,
                               0, 0, items_to_kill);
}

void LLAppearanceMgr::enforceCOFItemRestrictions(LLPointer<LLInventoryCallback> cb)
{
    LLInventoryObject::object_list_t items_to_kill;
    findAllExcessOrDuplicateItems(getCOF(), items_to_kill);
    if (items_to_kill.size()>0)
    {
        // Remove duplicate or excess wearables. Should normally be enforced at the UI level, but
        // this should catch anything that gets through.
        remove_inventory_items(items_to_kill, cb);
    }
}

bool sort_by_linked_uuid(const LLViewerInventoryItem* item1, const LLViewerInventoryItem* item2)
{
    if (!item1 || !item2)
    {
        LL_WARNS() << "item1, item2 cannot be null, something is very wrong" << LL_ENDL;
        return true;
    }

    return item1->getLinkedUUID() < item2->getLinkedUUID();
}

void get_sorted_base_and_cof_items(LLInventoryModel::item_array_t& cof_item_array, LLInventoryModel::item_array_t& outfit_item_array)
{
    LLUUID base_outfit_id = LLAppearanceMgr::instance().getBaseOutfitUUID();

    if (base_outfit_id.notNull())
    {
        LLIsValidItemLink collector;
        LLInventoryModel::cat_array_t sub_cat_array;

        gInventory.collectDescendents(base_outfit_id,
            sub_cat_array,
            outfit_item_array,
            LLInventoryModel::EXCLUDE_TRASH);

        LLInventoryModel::cat_array_t cof_cats;

        gInventory.collectDescendentsIf(LLAppearanceMgr::instance().getCOF(), cof_cats, cof_item_array,
            LLInventoryModel::EXCLUDE_TRASH, collector);

        for (U32 i = 0; i < outfit_item_array.size(); ++i)
        {
            LLViewerInventoryItem* linked_item = outfit_item_array.at(i)->getLinkedItem();
            if (linked_item != NULL && linked_item->getActualType() == LLAssetType::AT_TEXTURE)
            {
                outfit_item_array.erase(outfit_item_array.begin() + i);
                break;
            }
        }

        std::sort(cof_item_array.begin(), cof_item_array.end(), sort_by_linked_uuid);
        std::sort(outfit_item_array.begin(), outfit_item_array.end(), sort_by_linked_uuid);
    }
}


void LLAppearanceMgr::updateAppearanceFromCOF(bool enforce_item_restrictions,
                                              bool enforce_ordering,
                                              nullary_func_t post_update_func)
{
    if (mIsInUpdateAppearanceFromCOF)
    {
        LL_WARNS() << "Called updateAppearanceFromCOF inside updateAppearanceFromCOF, skipping" << LL_ENDL;
        return;
    }

    LL_DEBUGS("Avatar") << self_av_string() << "starting" << LL_ENDL;

    if (gInventory.hasPosiblyBrockenLinks())
    {
        // Inventory has either broken links or links that
        // haven't loaded yet.
        // Check if LLAppearanceMgr needs to wait.
        LLUUID current_outfit_id = getCOF();
        LLInventoryModel::item_array_t cof_items;
        LLInventoryModel::cat_array_t cof_cats;
        LLFindBrokenLinks is_brocken_link;
        gInventory.collectDescendentsIf(current_outfit_id,
            cof_cats,
            cof_items,
            LLInventoryModel::EXCLUDE_TRASH,
            is_brocken_link);

        if (cof_items.size() > 0)
        {
            // Some links haven't loaded yet, but fetch isn't complete so
            // links are likely fine and we will have to wait for them to
            // load
            if (LLInventoryModelBackgroundFetch::getInstance()->folderFetchActive())
            {

                LLBrokenLinkObserver* observer = new LLBrokenLinkObserver(cof_items.front()->getUUID(),
                                                                            enforce_item_restrictions,
                                                                            enforce_ordering,
                                                                            post_update_func);
                gInventory.addObserver(observer);
                return;
            }
        }
    }

    if (enforce_item_restrictions)
    {
        // The point here is just to call
        // updateAppearanceFromCOF() again after excess items
        // have been removed. That time we will set
        // enforce_item_restrictions to false so we don't get
        // caught in a perpetual loop.
        LLPointer<LLInventoryCallback> cb(
            new LLUpdateAppearanceOnDestroy(false, enforce_ordering, post_update_func));
        enforceCOFItemRestrictions(cb);
        return;
    }

    if (enforce_ordering)
    {
        //checking integrity of the COF in terms of ordering of wearables,
        //checking and updating links' descriptions of wearables in the COF (before analyzed for "dirty" state)

        // As with enforce_item_restrictions handling above, we want
        // to wait for the update callbacks, then (finally!) call
        // updateAppearanceFromCOF() with no additional COF munging needed.
        LLPointer<LLInventoryCallback> cb(
            new LLUpdateAppearanceOnDestroy(false, false, post_update_func));
        updateClothingOrderingInfo(LLUUID::null, cb);
        return;
    }

    if (!validateClothingOrderingInfo())
    {

        LLInventoryModel::item_array_t outfit_item_array;
        LLInventoryModel::item_array_t cof_item_array;
        get_sorted_base_and_cof_items(cof_item_array, outfit_item_array);

        if (outfit_item_array.size() == cof_item_array.size())
        {
            for (U32 i = 0; i < cof_item_array.size(); ++i)
            {
                LLViewerInventoryItem *cof_it = cof_item_array.at(i);
                LLViewerInventoryItem *base_it = outfit_item_array.at(i);

                if (cof_it->getActualDescription() != base_it->getActualDescription())
                {
                    if (cof_it->getLinkedUUID() == base_it->getLinkedUUID())
                    {
                        cof_it->setDescription(base_it->getActualDescription());
                        gInventory.updateItem(cof_it);
                    }
                }
            }
            LLAppearanceMgr::getInstance()->updateIsDirty();
        }

    }

    BoolSetter setIsInUpdateAppearanceFromCOF(mIsInUpdateAppearanceFromCOF);
    selfStartPhase("update_appearance_from_cof");

    // update dirty flag to see if the state of the COF matches
    // the saved outfit stored as a folder link
    updateIsDirty();

    // Send server request for appearance update
    if (gAgent.getRegion() && gAgent.getRegion()->getCentralBakeVersion())
    {
        requestServerAppearanceUpdate();
    }

    LLUUID current_outfit_id = getCOF();

    // Find all the wearables that are in the COF's subtree.
    LL_DEBUGS() << "LLAppearanceMgr::updateFromCOF()" << LL_ENDL;
    LLInventoryModel::item_array_t wear_items;
    LLInventoryModel::item_array_t obj_items;
    LLInventoryModel::item_array_t gest_items;
    getUserDescendents(current_outfit_id, wear_items, obj_items, gest_items);
    // Get rid of non-links in case somehow the COF was corrupted.
    remove_non_link_items(wear_items);
    remove_non_link_items(obj_items);
    remove_non_link_items(gest_items);

    dumpItemArray(wear_items,"asset_dump: wear_item");
    dumpItemArray(obj_items,"asset_dump: obj_item");

    LLViewerInventoryCategory *cof = gInventory.getCategory(current_outfit_id);
    if (!gInventory.isCategoryComplete(current_outfit_id))
    {
        LL_WARNS() << "COF info is not complete. Version " << cof->getVersion()
                << " descendent_count " << cof->getDescendentCount()
                << " viewer desc count " << cof->getViewerDescendentCount() << LL_ENDL;
    }
    if(!wear_items.size())
    {
        LLNotificationsUtil::add("CouldNotPutOnOutfit");
        return;
    }

    //preparing the list of wearables in the correct order for LLAgentWearables
    sortItemsByActualDescription(wear_items);


    LL_DEBUGS("Avatar") << "HP block starts" << LL_ENDL;
    LLTimer hp_block_timer;
    LLWearableHoldingPattern* holder = new LLWearableHoldingPattern;

    holder->setObjItems(obj_items);
    holder->setGestItems(gest_items);

    // Note: can't do normal iteration, because if all the
    // wearables can be resolved immediately, then the
    // callback will be called (and this object deleted)
    // before the final getNextData().

    for(S32 i = 0; i  < wear_items.size(); ++i)
    {
        LLViewerInventoryItem *item = wear_items.at(i);
        LLViewerInventoryItem *linked_item = item ? item->getLinkedItem() : NULL;

        // Fault injection: use debug setting to test asset
        // fetch failures (should be replaced by new defaults in
        // lost&found).
        U32 skip_type = gSavedSettings.getU32("ForceAssetFail");

        if (item && item->getIsLinkType() && linked_item)
        {
            LLFoundData found(linked_item->getUUID(),
                              linked_item->getAssetUUID(),
                              linked_item->getName(),
                              linked_item->getType(),
                              linked_item->isWearableType() ? linked_item->getWearableType() : LLWearableType::WT_INVALID
                );

            if (skip_type != LLWearableType::WT_INVALID && skip_type == found.mWearableType)
            {
                found.mAssetID.generate(); // Replace with new UUID, guaranteed not to exist in DB
            }
            //pushing back, not front, to preserve order of wearables for LLAgentWearables
            holder->getFoundList().push_back(found);
        }
        else
        {
            if (!item)
            {
                LL_WARNS() << "Attempt to wear a null item " << LL_ENDL;
            }
            else if (!linked_item)
            {
                LL_WARNS() << "Attempt to wear a broken link [ name:" << item->getName() << " ] " << LL_ENDL;
            }
        }
    }

    selfStartPhase("get_wearables_2");

    for (LLWearableHoldingPattern::found_list_t::iterator it = holder->getFoundList().begin();
         it != holder->getFoundList().end(); ++it)
    {
        LLFoundData& found = *it;

        LL_DEBUGS() << self_av_string() << "waiting for onWearableAssetFetch callback, asset " << found.mAssetID.asString() << LL_ENDL;

        // Fetch the wearables about to be worn.
        LLWearableList::instance().getAsset(found.mAssetID,
                                            found.mName,
                                            gAgentAvatarp,
                                            found.mAssetType,
                                            onWearableAssetFetch,
                                            (void*)holder);

    }

    holder->resetTime(gSavedSettings.getF32("MaxWearableWaitTime"));
    if (!holder->pollFetchCompletion())
    {
        doOnIdleRepeating(boost::bind(&LLWearableHoldingPattern::pollFetchCompletion,holder));
    }
    post_update_func();

    LL_DEBUGS("Avatar") << "HP block ends, elapsed " << hp_block_timer.getElapsedTimeF32() << LL_ENDL;
}

void LLAppearanceMgr::getDescendentsOfAssetType(const LLUUID& category,
                                                    LLInventoryModel::item_array_t& items,
                                                    LLAssetType::EType type)
{
    LLInventoryModel::cat_array_t cats;
    LLIsType is_of_type(type);
    gInventory.collectDescendentsIf(category,
                                    cats,
                                    items,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    is_of_type);
}

void LLAppearanceMgr::getUserDescendents(const LLUUID& category,
                                             LLInventoryModel::item_array_t& wear_items,
                                             LLInventoryModel::item_array_t& obj_items,
                                             LLInventoryModel::item_array_t& gest_items)
{
    LLInventoryModel::cat_array_t wear_cats;
    LLFindWearables is_wearable;
    gInventory.collectDescendentsIf(category,
                                    wear_cats,
                                    wear_items,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    is_wearable);

    LLInventoryModel::cat_array_t obj_cats;
    LLIsType is_object( LLAssetType::AT_OBJECT );
    gInventory.collectDescendentsIf(category,
                                    obj_cats,
                                    obj_items,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    is_object);

    // Find all gestures in this folder
    LLInventoryModel::cat_array_t gest_cats;
    LLIsType is_gesture( LLAssetType::AT_GESTURE );
    gInventory.collectDescendentsIf(category,
                                    gest_cats,
                                    gest_items,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    is_gesture);
}

void LLAppearanceMgr::wearInventoryCategory(LLInventoryCategory* category, bool copy, bool append)
{
    if(!category) return;

    selfClearPhases();
    selfStartPhase("wear_inventory_category");

    gAgentWearables.notifyLoadingStarted();

    LL_INFOS("Avatar") << self_av_string() << "wearInventoryCategory( " << category->getName()
             << " )" << LL_ENDL;

    // If we are copying from library, attempt to use AIS to copy the category.
    if (copy && AISAPI::isAvailable())
    {
        LLUUID parent_id;
        parent_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_CLOTHING);
        if (parent_id.isNull())
        {
            parent_id = gInventory.getRootFolderID();
        }

        LLPointer<LLInventoryCallback> copy_cb = new LLWearCategoryAfterCopy(append);
        LLPointer<LLInventoryCallback> track_cb = new LLTrackPhaseWrapper(
                                                    std::string("wear_inventory_category_callback"), copy_cb);

        AISAPI::completion_t cr = boost::bind(&doAppearanceCb, track_cb, _1);
        AISAPI::CopyLibraryCategory(category->getUUID(), parent_id, false, cr);
    }
    else
    {
        selfStartPhase("wear_inventory_category_fetch");
        if (AISAPI::isAvailable() && category->getPreferredType() == LLFolderType::FT_OUTFIT)
        {
            // for reliability just fetch it whole, linked items included
            LLUUID cat_id = category->getUUID();
            LLInventoryModelBackgroundFetch::getInstance()->fetchFolderAndLinks(
                                cat_id,
                                [cat_id, copy, append]
                                {
                                    LLAppearanceMgr::instance().wearCategoryFinal(cat_id, copy, append);
                                });
        }
        else
        {
            callAfterCategoryFetch(category->getUUID(), boost::bind(&LLAppearanceMgr::wearCategoryFinal,
                                                                    &LLAppearanceMgr::instance(),
                                                                    category->getUUID(), copy, append));
        }
    }
}

S32 LLAppearanceMgr::getActiveCopyOperations() const
{
    return LLCallAfterInventoryCopyMgr::getInstanceCount();
}

void LLAppearanceMgr::wearCategoryFinal(const LLUUID& cat_id, bool copy_items, bool append)
{
    LL_INFOS("Avatar") << self_av_string() << "starting" << LL_ENDL;

    selfStopPhase("wear_inventory_category_fetch");

    // We now have an outfit ready to be copied to agent inventory. Do
    // it, and wear that outfit normally.
    LLInventoryCategory* cat = gInventory.getCategory(cat_id);
    if(copy_items)
    {
        LLInventoryModel::cat_array_t* cats;
        LLInventoryModel::item_array_t* items;
        gInventory.getDirectDescendentsOf(cat_id, cats, items);
        std::string name;
        if(!cat)
        {
            // should never happen.
            name = "New Outfit";
        }
        else
        {
            name = cat->getName();
        }
        LLViewerInventoryItem* item = NULL;
        LLInventoryModel::item_array_t::const_iterator it = items->begin();
        LLInventoryModel::item_array_t::const_iterator end = items->end();
        LLUUID pid;
        for(; it < end; ++it)
        {
            item = *it;
            if(item)
            {
                if(LLInventoryType::IT_GESTURE == item->getInventoryType())
                {
                    pid = gInventory.findCategoryUUIDForType(LLFolderType::FT_GESTURE);
                }
                else
                {
                    pid = gInventory.findCategoryUUIDForType(LLFolderType::FT_CLOTHING);
                }
                break;
            }
        }
        if(pid.isNull())
        {
            pid = gInventory.getRootFolderID();
        }

        gInventory.createNewCategory(
            pid,
            LLFolderType::FT_NONE,
            name,
            [cat_id, append](const LLUUID& new_cat_id)
        {
            LLInventoryModel::cat_array_t* cats;
            LLInventoryModel::item_array_t* items;
            gInventory.getDirectDescendentsOf(cat_id, cats, items);
            // Create a CopyMgr that will copy items, manage its own destruction
            new LLCallAfterInventoryCopyMgr(
                *items, new_cat_id, std::string("wear_inventory_category_callback"),
                boost::bind(&LLAppearanceMgr::wearInventoryCategoryOnAvatar,
                    LLAppearanceMgr::getInstance(),
                    gInventory.getCategory(new_cat_id),
                    append));

            // BAP fixes a lag in display of created dir.
            gInventory.notifyObservers();
        },
            cat->getThumbnailUUID()
        );
    }
    else
    {
        // Wear the inventory category.
        LLAppearanceMgr::instance().wearInventoryCategoryOnAvatar(cat, append);
    }
}

// *NOTE: hack to get from avatar inventory to avatar
void LLAppearanceMgr::wearInventoryCategoryOnAvatar( LLInventoryCategory* category, bool append )
{
    // Avoid unintentionally overwriting old wearables.  We have to do
    // this up front to avoid having to deal with the case of multiple
    // wearables being dirty.
    if (!category) return;

    if ( !LLInventoryCallbackManager::is_instantiated() )
    {
        // shutting down, ignore.
        return;
    }

    LL_INFOS("Avatar") << self_av_string() << "wearInventoryCategoryOnAvatar '" << category->getName()
             << "'" << LL_ENDL;
    LLUIUsage::instance().logCommand("Avatar.WearCategory");

    if (gAgentCamera.cameraCustomizeAvatar())
    {
        // switching to outfit editor should automagically save any currently edited wearable
        LLFloaterSidePanelContainer::showPanel("appearance", LLSD().with("type", "edit_outfit"));
    }

    LLAppearanceMgr::changeOutfit(true, category->getUUID(), append);
}

// FIXME do we really want to search entire inventory for matching name?
void LLAppearanceMgr::wearOutfitByName(const std::string& name)
{
    LL_INFOS("Avatar") << self_av_string() << "Wearing category " << name << LL_ENDL;

    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    LLNameCategoryCollector has_name(name);
    gInventory.collectDescendentsIf(gInventory.getRootFolderID(),
                                    cat_array,
                                    item_array,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    has_name);
    bool copy_items = false;
    LLInventoryCategory* cat = NULL;
    if (cat_array.size() > 0)
    {
        // Just wear the first one that matches
        cat = cat_array.at(0);
    }
    else
    {
        gInventory.collectDescendentsIf(LLUUID::null,
                                        cat_array,
                                        item_array,
                                        LLInventoryModel::EXCLUDE_TRASH,
                                        has_name);
        if(cat_array.size() > 0)
        {
            cat = cat_array.at(0);
            copy_items = true;
        }
    }

    if(cat)
    {
        LLAppearanceMgr::wearInventoryCategory(cat, copy_items, false);
    }
    else
    {
        LL_WARNS() << "Couldn't find outfit " <<name<< " in wearOutfitByName()"
                << LL_ENDL;
    }
}

bool areMatchingWearables(const LLViewerInventoryItem *a, const LLViewerInventoryItem *b)
{
    return (a->isWearableType() && b->isWearableType() &&
            (a->getWearableType() == b->getWearableType()));
}

class LLDeferredCOFLinkObserver: public LLInventoryObserver
{
public:
    LLDeferredCOFLinkObserver(const LLUUID& item_id, LLPointer<LLInventoryCallback> cb, const std::string& description):
        mItemID(item_id),
        mCallback(cb),
        mDescription(description)
    {
    }

    ~LLDeferredCOFLinkObserver()
    {
    }

    /* virtual */ void changed(U32 mask)
    {
        const LLInventoryItem *item = gInventory.getItem(mItemID);
        if (item)
        {
            gInventory.removeObserver(this);
            LLAppearanceMgr::instance().addCOFItemLink(item, mCallback, mDescription);
            delete this;
        }
    }

private:
    const LLUUID mItemID;
    std::string mDescription;
    LLPointer<LLInventoryCallback> mCallback;
};


// BAP - note that this runs asynchronously if the item is not already loaded from inventory.
// Dangerous if caller assumes link will exist after calling the function.
void LLAppearanceMgr::addCOFItemLink(const LLUUID &item_id,
                                     LLPointer<LLInventoryCallback> cb,
                                     const std::string description)
{
    const LLInventoryItem *item = gInventory.getItem(item_id);
    if (!item)
    {
        LLDeferredCOFLinkObserver *observer = new LLDeferredCOFLinkObserver(item_id, cb, description);
        gInventory.addObserver(observer);
    }
    else
    {
        addCOFItemLink(item, cb, description);
    }
}

void LLAppearanceMgr::addCOFItemLink(const LLInventoryItem *item,
                                     LLPointer<LLInventoryCallback> cb,
                                     const std::string description)
{
    const LLViewerInventoryItem *vitem = dynamic_cast<const LLViewerInventoryItem*>(item);
    if (!vitem)
    {
        LL_WARNS() << "not an llviewerinventoryitem, failed" << LL_ENDL;
        return;
    }

    gInventory.addChangedMask(LLInventoryObserver::LABEL, vitem->getLinkedUUID());

    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    gInventory.collectDescendents(LLAppearanceMgr::getCOF(),
                                  cat_array,
                                  item_array,
                                  LLInventoryModel::EXCLUDE_TRASH);
    bool linked_already = false;
    for (S32 i=0; i<item_array.size(); i++)
    {
        // Are these links to the same object?
        const LLViewerInventoryItem* inv_item = item_array.at(i).get();
        const LLWearableType::EType wearable_type = inv_item->getWearableType();

        const bool is_body_part =    (wearable_type == LLWearableType::WT_SHAPE)
                                  || (wearable_type == LLWearableType::WT_HAIR)
                                  || (wearable_type == LLWearableType::WT_EYES)
                                  || (wearable_type == LLWearableType::WT_SKIN);

        if (inv_item->getLinkedUUID() == vitem->getLinkedUUID())
        {
            linked_already = true;
        }
        // Are these links to different items of the same body part
        // type? If so, new item will replace old.
        else if ((vitem->isWearableType()) && (vitem->getWearableType() == wearable_type))
        {
            if (is_body_part && inv_item->getIsLinkType())
            {
                remove_inventory_item(inv_item->getUUID(), cb);
            }
            else if (!gAgentWearables.canAddWearable(wearable_type))
            {
                // MULTI-WEARABLES: make sure we don't go over clothing limits
                remove_inventory_item(inv_item->getUUID(), cb);
            }
        }
    }

    if (!linked_already)
    {
        LLViewerInventoryItem *copy_item = new LLViewerInventoryItem;
        copy_item->copyViewerItem(vitem);
        copy_item->setDescription(description);
        link_inventory_object(getCOF(), copy_item, cb);
    }
}

LLInventoryModel::item_array_t LLAppearanceMgr::findCOFItemLinks(const LLUUID& item_id)
{
    LLInventoryModel::item_array_t result;

    LLUUID linked_id = gInventory.getLinkedItemID(item_id);
    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    gInventory.collectDescendents(LLAppearanceMgr::getCOF(),
                                  cat_array,
                                  item_array,
                                  LLInventoryModel::EXCLUDE_TRASH);
    for (S32 i=0; i<item_array.size(); i++)
    {
        const LLViewerInventoryItem* inv_item = item_array.at(i).get();
        if (inv_item->getLinkedUUID() == linked_id)
        {
            result.push_back(item_array.at(i));
        }
    }
    return result;
}

bool LLAppearanceMgr::isLinkedInCOF(const LLUUID& item_id)
{
    LLInventoryModel::item_array_t links = LLAppearanceMgr::instance().findCOFItemLinks(item_id);
    return links.size() > 0;
}

void LLAppearanceMgr::removeAllClothesFromAvatar()
{
    // Fetch worn clothes (i.e. the ones in COF).
    LLInventoryModel::item_array_t clothing_items;
    LLInventoryModel::cat_array_t dummy;
    LLIsType is_clothing(LLAssetType::AT_CLOTHING);
    gInventory.collectDescendentsIf(getCOF(),
                                    dummy,
                                    clothing_items,
                                    LLInventoryModel::EXCLUDE_TRASH,
                                    is_clothing);
    uuid_vec_t item_ids;
    for (LLInventoryModel::item_array_t::iterator it = clothing_items.begin();
        it != clothing_items.end(); ++it)
    {
        item_ids.push_back((*it).get()->getLinkedUUID());
    }

    // Take them off by removing from COF.
    removeItemsFromAvatar(item_ids);
}

void LLAppearanceMgr::removeAllAttachmentsFromAvatar()
{
    if (!isAgentAvatarValid()) return;

    LLAgentWearables::llvo_vec_t objects_to_remove;

    for (LLVOAvatar::attachment_map_t::iterator iter = gAgentAvatarp->mAttachmentPoints.begin();
         iter != gAgentAvatarp->mAttachmentPoints.end();)
    {
        LLVOAvatar::attachment_map_t::iterator curiter = iter++;
        LLViewerJointAttachment* attachment = curiter->second;
        for (LLViewerJointAttachment::attachedobjs_vec_t::iterator attachment_iter = attachment->mAttachedObjects.begin();
             attachment_iter != attachment->mAttachedObjects.end();
             ++attachment_iter)
        {
            LLViewerObject *attached_object = attachment_iter->get();
            if (attached_object)
            {
                objects_to_remove.push_back(attached_object);
            }
        }
    }
    uuid_vec_t ids_to_remove;
    for (LLAgentWearables::llvo_vec_t::iterator it = objects_to_remove.begin();
         it != objects_to_remove.end();
         ++it)
    {
        ids_to_remove.push_back((*it)->getAttachmentItemID());
    }
    removeItemsFromAvatar(ids_to_remove);
}

class LLUpdateOnCOFLinkRemove : public LLInventoryCallback
{
public:
    LLUpdateOnCOFLinkRemove(const LLUUID& remove_item_id, LLPointer<LLInventoryCallback> cb = NULL):
        mItemID(remove_item_id),
        mCB(cb)
    {
    }

    /* virtual */ void fire(const LLUUID& item_id)
    {
        // just removed cof link, "(wear)" suffix depends on presence of link, so update label
        gInventory.addChangedMask(LLInventoryObserver::LABEL, mItemID);
        if (mCB.notNull())
        {
            mCB->fire(item_id);
        }
    }

private:
    LLUUID mItemID;
    LLPointer<LLInventoryCallback> mCB;
};

void LLAppearanceMgr::removeCOFItemLinks(const LLUUID& item_id, LLPointer<LLInventoryCallback> cb)
{   LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    gInventory.collectDescendents(LLAppearanceMgr::getCOF(),
                                  cat_array,
                                  item_array,
                                  LLInventoryModel::EXCLUDE_TRASH);
    for (S32 i=0; i<item_array.size(); i++)
    {
        const LLInventoryItem* item = item_array.at(i).get();
        if (item->getIsLinkType() && item->getLinkedUUID() == item_id)
        {
            if (item->getType() == LLAssetType::AT_OBJECT)
            {
                // Immediate delete
                remove_inventory_item(item->getUUID(), cb, true);
                gInventory.addChangedMask(LLInventoryObserver::LABEL, item_id);
            }
            else
            {
                // Delayed delete
                // Pointless to update item_id label here since link still exists and first notifyObservers
                // call will restore (wear) suffix, mark for update after deletion
                LLPointer<LLUpdateOnCOFLinkRemove> cb_label = new LLUpdateOnCOFLinkRemove(item_id, cb);
                remove_inventory_item(item->getUUID(), cb_label, false);
            }
        }
    }
}

void LLAppearanceMgr::removeCOFLinksOfType(LLWearableType::EType type, LLPointer<LLInventoryCallback> cb)
{
    LLFindWearablesOfType filter_wearables_of_type(type);
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLInventoryModel::item_array_t::const_iterator it;

    gInventory.collectDescendentsIf(getCOF(), cats, items, true, filter_wearables_of_type);
    for (it = items.begin(); it != items.end(); ++it)
    {
        const LLViewerInventoryItem* item = *it;
        if (item->getIsLinkType()) // we must operate on links only
        {
            remove_inventory_item(item->getUUID(), cb);
        }
    }
}

void LLAppearanceMgr::updateIsDirty()
{
    LLUUID cof = getCOF();
    LLUUID base_outfit;

    // find base outfit link
    const LLViewerInventoryItem* base_outfit_item = getBaseOutfitLink();
    LLViewerInventoryCategory* catp = NULL;
    if (base_outfit_item && base_outfit_item->getIsLinkType())
    {
        catp = base_outfit_item->getLinkedCategory();
    }
    if(catp && catp->getPreferredType() == LLFolderType::FT_OUTFIT)
    {
        base_outfit = catp->getUUID();
    }

    // Set dirty to "false" if no base outfit found to disable "Save"
    // and leave only "Save As" enabled in My Outfits.
    mOutfitIsDirty = false;

    if (base_outfit.notNull())
    {
        LLIsValidItemLink collector;

        LLInventoryModel::cat_array_t cof_cats;
        LLInventoryModel::item_array_t cof_items;
        gInventory.collectDescendentsIf(cof, cof_cats, cof_items,
                                      LLInventoryModel::EXCLUDE_TRASH, collector);

        LLInventoryModel::cat_array_t outfit_cats;
        LLInventoryModel::item_array_t outfit_items;
        gInventory.collectDescendentsIf(base_outfit, outfit_cats, outfit_items,
                                      LLInventoryModel::EXCLUDE_TRASH, collector);

        for (U32 i = 0; i < outfit_items.size(); ++i)
        {
            LLViewerInventoryItem* linked_item = outfit_items.at(i)->getLinkedItem();
            if (linked_item != NULL && linked_item->getActualType() == LLAssetType::AT_TEXTURE)
            {
                outfit_items.erase(outfit_items.begin() + i);
                break;
            }
        }

        if(outfit_items.size() != cof_items.size())
        {
            LL_DEBUGS("Avatar") << "item count different - base " << outfit_items.size() << " cof " << cof_items.size() << LL_ENDL;
            // Current outfit folder should have one more item than the outfit folder.
            // this one item is the link back to the outfit folder itself.
            mOutfitIsDirty = true;
            return;
        }

        //"dirty" - also means a difference in linked UUIDs and/or a difference in wearables order (links' descriptions)
        std::sort(cof_items.begin(), cof_items.end(), sort_by_linked_uuid);
        std::sort(outfit_items.begin(), outfit_items.end(), sort_by_linked_uuid);

        for (U32 i = 0; i < cof_items.size(); ++i)
        {
            LLViewerInventoryItem *item1 = cof_items.at(i);
            LLViewerInventoryItem *item2 = outfit_items.at(i);

            if (item1->getLinkedUUID() != item2->getLinkedUUID() ||
                item1->getName() != item2->getName() ||
                item1->getActualDescription() != item2->getActualDescription())
            {
                if (item1->getLinkedUUID() != item2->getLinkedUUID())
                {
                    LL_DEBUGS("Avatar") << "link id different " << LL_ENDL;
                }
                else
                {
                    if (item1->getName() != item2->getName())
                    {
                        LL_DEBUGS("Avatar") << "name different " << item1->getName() << " " << item2->getName() << LL_ENDL;
                    }
                    if (item1->getActualDescription() != item2->getActualDescription())
                    {
                        LL_DEBUGS("Avatar") << "desc different " << item1->getActualDescription()
                                            << " " << item2->getActualDescription()
                                            << " names " << item1->getName() << " " << item2->getName() << LL_ENDL;
                    }
                }
                mOutfitIsDirty = true;
                return;
            }
        }
    }
    llassert(!mOutfitIsDirty);
    LL_DEBUGS("Avatar") << "clean" << LL_ENDL;
}

// *HACK: Must match name in Library or agent inventory
const std::string ROOT_GESTURES_FOLDER = "Gestures";
const std::string COMMON_GESTURES_FOLDER = "Common Gestures";
const std::string MALE_GESTURES_FOLDER = "Male Gestures";
const std::string FEMALE_GESTURES_FOLDER = "Female Gestures";
const std::string SPEECH_GESTURES_FOLDER = "Speech Gestures";
const std::string OTHER_GESTURES_FOLDER = "Other Gestures";

void LLAppearanceMgr::copyLibraryGestures()
{
    LL_INFOS("Avatar") << self_av_string() << "Copying library gestures" << LL_ENDL;

    // Copy gestures
    LLUUID lib_gesture_cat_id =
        gInventory.findLibraryCategoryUUIDForType(LLFolderType::FT_GESTURE);
    if (lib_gesture_cat_id.isNull())
    {
        LL_WARNS() << "Unable to copy gestures, source category not found" << LL_ENDL;
    }
    LLUUID dst_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_GESTURE);

    std::vector<std::string> gesture_folders_to_copy;
    gesture_folders_to_copy.push_back(MALE_GESTURES_FOLDER);
    gesture_folders_to_copy.push_back(FEMALE_GESTURES_FOLDER);
    gesture_folders_to_copy.push_back(COMMON_GESTURES_FOLDER);
    gesture_folders_to_copy.push_back(SPEECH_GESTURES_FOLDER);
    gesture_folders_to_copy.push_back(OTHER_GESTURES_FOLDER);

    for(std::vector<std::string>::iterator it = gesture_folders_to_copy.begin();
        it != gesture_folders_to_copy.end();
        ++it)
    {
        std::string& folder_name = *it;

        LLPointer<LLInventoryCallback> cb(NULL);

        // After copying gestures, activate Common, Other, plus
        // Male and/or Female, depending upon the initial outfit gender.
        ESex gender = gAgentAvatarp->getSex();

        std::string activate_male_gestures;
        std::string activate_female_gestures;
        switch (gender) {
            case SEX_MALE:
                activate_male_gestures = MALE_GESTURES_FOLDER;
                break;
            case SEX_FEMALE:
                activate_female_gestures = FEMALE_GESTURES_FOLDER;
                break;
            case SEX_BOTH:
                activate_male_gestures = MALE_GESTURES_FOLDER;
                activate_female_gestures = FEMALE_GESTURES_FOLDER;
                break;
        }

        if (folder_name == activate_male_gestures ||
            folder_name == activate_female_gestures ||
            folder_name == COMMON_GESTURES_FOLDER ||
            folder_name == OTHER_GESTURES_FOLDER)
        {
            cb = new LLBoostFuncInventoryCallback(activate_gesture_cb);
        }

        LLUUID cat_id = findDescendentCategoryIDByName(lib_gesture_cat_id,folder_name);
        if (cat_id.isNull())
        {
            LL_WARNS() << self_av_string() << "failed to find gesture folder for " << folder_name << LL_ENDL;
        }
        else
        {
            LL_DEBUGS("Avatar") << self_av_string() << "initiating fetch and copy for " << folder_name << " cat_id " << cat_id << LL_ENDL;
            callAfterCategoryFetch(cat_id,
                                   boost::bind(&LLAppearanceMgr::shallowCopyCategory,
                                               &LLAppearanceMgr::instance(),
                                               cat_id, dst_id, cb));
        }
    }
}

// Handler for anything that's deferred until avatar de-clouds.
void LLAppearanceMgr::onFirstFullyVisible()
{
    gAgentAvatarp->outputRezTiming("Avatar fully loaded");
    gAgentAvatarp->reportAvatarRezTime();
    gAgentAvatarp->debugAvatarVisible();

    // If this is the first time we've ever logged in,
    // then copy default gestures from the library.
    if (gAgent.isFirstLogin()) {
        copyLibraryGestures();
    }
}

// update "dirty" state - defined outside class to allow for calling
// after appearance mgr instance has been destroyed.
void appearance_mgr_update_dirty_state()
{
    if (LLAppearanceMgr::instanceExists())
    {
        LLAppearanceMgr& app_mgr = LLAppearanceMgr::instance();
        LLUUID image_id = app_mgr.getOutfitImage();
        if(image_id.notNull())
        {
            LLPointer<LLInventoryCallback> cb = NULL;
            link_inventory_object(app_mgr.getBaseOutfitUUID(), image_id, cb);
        }

        LLAppearanceMgr::getInstance()->updateIsDirty();
        LLAppearanceMgr::getInstance()->setOutfitLocked(false);
        gAgentWearables.notifyLoadingFinished();
    }
}

void update_base_outfit_after_ordering()
{
    LLAppearanceMgr& app_mgr = LLAppearanceMgr::instance();
    app_mgr.setOutfitImage(LLUUID());
    LLInventoryModel::cat_array_t sub_cat_array;
    LLInventoryModel::item_array_t outfit_item_array;
    gInventory.collectDescendents(app_mgr.getBaseOutfitUUID(),
                                sub_cat_array,
                                outfit_item_array,
                                LLInventoryModel::EXCLUDE_TRASH);
    for (LLViewerInventoryItem* outfit_item : outfit_item_array)
    {
        LLViewerInventoryItem* linked_item = outfit_item->getLinkedItem();
        if (linked_item != NULL)
        {
            if (linked_item->getActualType() == LLAssetType::AT_TEXTURE)
            {
                app_mgr.setOutfitImage(linked_item->getLinkedUUID());
                if (linked_item->getName() == LLAppearanceMgr::sExpectedTextureName)
                {
                    // Images with "appropriate" name take priority
                    break;
                }
            }
        }
        else if (outfit_item->getActualType() == LLAssetType::AT_TEXTURE)
        {
            app_mgr.setOutfitImage(outfit_item->getUUID());
            if (outfit_item->getName() == LLAppearanceMgr::sExpectedTextureName)
            {
                // Images with "appropriate" name take priority
                break;
            }
        }
    }

    LLPointer<LLInventoryCallback> dirty_state_updater =
        new LLBoostFuncInventoryCallback(no_op_inventory_func, appearance_mgr_update_dirty_state);

    //COF contains only links so we copy to the Base Outfit only links
    const LLUUID base_outfit_id = app_mgr.getBaseOutfitUUID();
    bool copy_folder_links = false;
    app_mgr.slamCategoryLinks(app_mgr.getCOF(), base_outfit_id, copy_folder_links, dirty_state_updater);

    if (base_outfit_id.notNull())
    {
        LLIsValidItemLink collector;

        LLInventoryModel::cat_array_t cof_cats;
        LLInventoryModel::item_array_t cof_item_array;
        gInventory.collectDescendentsIf(app_mgr.getCOF(), cof_cats, cof_item_array,
            LLInventoryModel::EXCLUDE_TRASH, collector);

        for (U32 i = 0; i < outfit_item_array.size(); ++i)
        {
            LLViewerInventoryItem* linked_item = outfit_item_array.at(i)->getLinkedItem();
            if (linked_item != NULL && linked_item->getActualType() == LLAssetType::AT_TEXTURE)
            {
                outfit_item_array.erase(outfit_item_array.begin() + i);
                break;
            }
        }

        if (outfit_item_array.size() != cof_item_array.size())
        {
            return;
        }

        std::sort(cof_item_array.begin(), cof_item_array.end(), sort_by_linked_uuid);
        std::sort(outfit_item_array.begin(), outfit_item_array.end(), sort_by_linked_uuid);

        for (U32 i = 0; i < cof_item_array.size(); ++i)
        {
            LLViewerInventoryItem *cof_it = cof_item_array.at(i);
            LLViewerInventoryItem *base_it = outfit_item_array.at(i);

            if (cof_it->getActualDescription() != base_it->getActualDescription())
            {
                if (cof_it->getLinkedUUID() == base_it->getLinkedUUID())
                {
                    base_it->setDescription(cof_it->getActualDescription());
                    gInventory.updateItem(base_it);
                }
            }
        }
        LLAppearanceMgr::getInstance()->updateIsDirty();
    }

}

// Save COF changes - update the contents of the current base outfit
// to match the current COF. Fails if no current base outfit is set.
bool LLAppearanceMgr::updateBaseOutfit()
{
    if (isOutfitLocked())
    {
        // don't allow modify locked outfit
        llassert(!isOutfitLocked());
        return false;
    }

    setOutfitLocked(true);

    gAgentWearables.notifyLoadingStarted();

    const LLUUID base_outfit_id = getBaseOutfitUUID();
    if (base_outfit_id.isNull()) return false;
    LL_DEBUGS("Avatar") << "saving cof to base outfit " << base_outfit_id << LL_ENDL;

    LLPointer<LLInventoryCallback> cb =
        new LLBoostFuncInventoryCallback(no_op_inventory_func, update_base_outfit_after_ordering);
    // Really shouldn't be needed unless there's a race condition -
    // updateAppearanceFromCOF() already calls updateClothingOrderingInfo.
    updateClothingOrderingInfo(LLUUID::null, cb);

    return true;
}

void LLAppearanceMgr::divvyWearablesByType(const LLInventoryModel::item_array_t& items, wearables_by_type_t& items_by_type)
{
    items_by_type.resize(LLWearableType::WT_COUNT);
    if (items.empty()) return;

    for (S32 i=0; i<items.size(); i++)
    {
        LLViewerInventoryItem *item = items.at(i);
        if (!item)
        {
            LL_WARNS("Appearance") << "NULL item found" << LL_ENDL;
            continue;
        }
        // Ignore non-wearables.
        if (!item->isWearableType())
            continue;
        LLWearableType::EType type = item->getWearableType();
        if(type < 0 || type >= LLWearableType::WT_COUNT)
        {
            LL_WARNS("Appearance") << "Invalid wearable type. Inventory type does not match wearable flag bitfield." << LL_ENDL;
            continue;
        }
        items_by_type[type].push_back(item);
    }
}

std::string build_order_string(LLWearableType::EType type, U32 i)
{
        std::ostringstream order_num;
        order_num << ORDER_NUMBER_SEPARATOR << type * 100 + i;
        return order_num.str();
}

struct WearablesOrderComparator
{
    LOG_CLASS(WearablesOrderComparator);
    WearablesOrderComparator(const LLWearableType::EType type)
    {
        mControlSize = static_cast<U32>(build_order_string(type, 0).size());
    };

    bool operator()(const LLInventoryItem* item1, const LLInventoryItem* item2)
    {
        const std::string& desc1 = item1->getActualDescription();
        const std::string& desc2 = item2->getActualDescription();

        bool item1_valid = (desc1.size() == mControlSize) && (ORDER_NUMBER_SEPARATOR == desc1[0]);
        bool item2_valid = (desc2.size() == mControlSize) && (ORDER_NUMBER_SEPARATOR == desc2[0]);

        if (item1_valid && item2_valid)
            return desc1 < desc2;

        //we need to sink down invalid items: items with empty descriptions, items with "Broken link" descriptions,
        //items with ordering information but not for the associated wearables type
        if (!item1_valid && item2_valid)
            return false;
        else if (item1_valid && !item2_valid)
            return true;

        return item1->getName() < item2->getName();
    }

    U32 mControlSize;
};

void LLAppearanceMgr::getWearableOrderingDescUpdates(LLInventoryModel::item_array_t& wear_items,
                                                     desc_map_t& desc_map)
{
    wearables_by_type_t items_by_type(LLWearableType::WT_COUNT);
    divvyWearablesByType(wear_items, items_by_type);

    for (U32 type = LLWearableType::WT_SHIRT; type < LLWearableType::WT_COUNT; type++)
    {
        U32 size = static_cast<U32>(items_by_type[type].size());
        if (!size) continue;

        //sinking down invalid items which need reordering
        std::sort(items_by_type[type].begin(), items_by_type[type].end(), WearablesOrderComparator((LLWearableType::EType) type));

        //requesting updates only for those links which don't have "valid" descriptions
        for (U32 i = 0; i < size; i++)
        {
            LLViewerInventoryItem* item = items_by_type[type][i];
            if (!item) continue;

            std::string new_order_str = build_order_string((LLWearableType::EType)type, i);
            if (new_order_str == item->getActualDescription()) continue;

            desc_map[item->getUUID()] = new_order_str;
        }
    }
}

bool LLAppearanceMgr::validateClothingOrderingInfo(LLUUID cat_id)
{
    // COF is processed if cat_id is not specified
    if (cat_id.isNull())
    {
        cat_id = getCOF();
    }

    LLInventoryModel::item_array_t wear_items;
    getDescendentsOfAssetType(cat_id, wear_items, LLAssetType::AT_CLOTHING);

    // Identify items for which desc needs to change.
    desc_map_t desc_map;
    getWearableOrderingDescUpdates(wear_items, desc_map);

    for (desc_map_t::const_iterator it = desc_map.begin();
         it != desc_map.end(); ++it)
    {
        const LLUUID& item_id = it->first;
        const std::string& new_order_str = it->second;
        LLViewerInventoryItem *item = gInventory.getItem(item_id);
        LL_WARNS() << "Order validation fails: " << item->getName()
                << " needs to update desc to: " << new_order_str
                << " (from: " << item->getActualDescription() << ")" << LL_ENDL;
    }

    return desc_map.size() == 0;
}

void LLAppearanceMgr::updateClothingOrderingInfo(LLUUID cat_id,
                                                 LLPointer<LLInventoryCallback> cb)
{
    // COF is processed if cat_id is not specified
    if (cat_id.isNull())
    {
        cat_id = getCOF();
    }

    LLInventoryModel::item_array_t wear_items;
    getDescendentsOfAssetType(cat_id, wear_items, LLAssetType::AT_CLOTHING);

    // Identify items for which desc needs to change.
    desc_map_t desc_map;
    getWearableOrderingDescUpdates(wear_items, desc_map);

    for (desc_map_t::const_iterator it = desc_map.begin();
         it != desc_map.end(); ++it)
    {
        LLSD updates;
        const LLUUID& item_id = it->first;
        const std::string& new_order_str = it->second;
        LLViewerInventoryItem *item = gInventory.getItem(item_id);
        LL_DEBUGS("Avatar") << item->getName() << " updating desc to: " << new_order_str
            << " (was: " << item->getActualDescription() << ")" << LL_ENDL;
        updates["desc"] = new_order_str;
        update_inventory_item(item_id,updates,cb);
    }

}


LLSD LLAppearanceMgr::dumpCOF() const
{
    LLSD links = LLSD::emptyArray();
    LLMD5 md5;

    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    gInventory.collectDescendents(getCOF(),cat_array,item_array,LLInventoryModel::EXCLUDE_TRASH);
    for (S32 i=0; i<item_array.size(); i++)
    {
        const LLViewerInventoryItem* inv_item = item_array.at(i).get();
        LLSD item;
        LLUUID item_id(inv_item->getUUID());
        md5.update((unsigned char*)item_id.mData, 16);
        item["description"] = inv_item->getActualDescription();
        md5.update(inv_item->getActualDescription());
        item["asset_type"] = inv_item->getActualType();
        LLUUID linked_id(inv_item->getLinkedUUID());
        item["linked_id"] = linked_id;
        md5.update((unsigned char*)linked_id.mData, 16);

        if (LLAssetType::AT_LINK == inv_item->getActualType())
        {
            const LLViewerInventoryItem* linked_item = inv_item->getLinkedItem();
            if (NULL == linked_item)
            {
                LL_WARNS() << "Broken link for item '" << inv_item->getName()
                        << "' (" << inv_item->getUUID()
                        << ") during requestServerAppearanceUpdate" << LL_ENDL;
                continue;
            }
            // Some assets may be 'hidden' and show up as null in the viewer.
            //if (linked_item->getAssetUUID().isNull())
            //{
            //  LL_WARNS() << "Broken link (null asset) for item '" << inv_item->getName()
            //          << "' (" << inv_item->getUUID()
            //          << ") during requestServerAppearanceUpdate" << LL_ENDL;
            //  continue;
            //}
            LLUUID linked_asset_id(linked_item->getAssetUUID());
            md5.update((unsigned char*)linked_asset_id.mData, 16);
            U32 flags = linked_item->getFlags();
            md5.update(std::to_string(flags));
        }
        else if (LLAssetType::AT_LINK_FOLDER != inv_item->getActualType())
        {
            LL_WARNS() << "Non-link item '" << inv_item->getName()
                    << "' (" << inv_item->getUUID()
                    << ") type " << (S32) inv_item->getActualType()
                    << " during requestServerAppearanceUpdate" << LL_ENDL;
            continue;
        }
        links.append(item);
    }
    LLSD result = LLSD::emptyMap();
    result["cof_contents"] = links;
    char cof_md5sum[MD5HEX_STR_SIZE];
    md5.finalize();
    md5.hex_digest(cof_md5sum);
    result["cof_md5sum"] = std::string(cof_md5sum);
    return result;
}

void LLAppearanceMgr::cleanup()
{
    mIsInUpdateAppearanceFromCOF = false;
    mOutstandingAppearanceBakeRequest = false;
    mRerequestAppearanceBake = false;
    mCOFID.setNull();
}

// static
void LLAppearanceMgr::onIdle(void *)
{
    LLAppearanceMgr* mgr = LLAppearanceMgr::getInstance();
    if (mgr->mRerequestAppearanceBake)
    {
        mgr->requestServerAppearanceUpdate();
    }
}

void LLAppearanceMgr::requestServerAppearanceUpdate()
{
    // Workaround: we shouldn't request update from server prior to uploading all attachments, but it is
    // complicated to check for pending attachment uploads, so we are just waiting for uploads to complete
    if (!mOutstandingAppearanceBakeRequest && gAssetStorage->getNumPendingUploads() == 0)
    {
        mRerequestAppearanceBake = false;
        LLCoprocedureManager::CoProcedure_t proc = boost::bind(&LLAppearanceMgr::serverAppearanceUpdateCoro, this, _1);
        LLCoprocedureManager::instance().enqueueCoprocedure("AIS", "LLAppearanceMgr::serverAppearanceUpdateCoro", proc);
    }
    else
    {
        // Shedule update
        mRerequestAppearanceBake = true;
    }
}

void LLAppearanceMgr::serverAppearanceUpdateCoro(LLCoreHttpUtil::HttpCoroutineAdapter::ptr_t &httpAdapter)
{
    BoolSetter outstanding(mOutstandingAppearanceBakeRequest);
    if (!gAgent.getRegion())
    {
        LL_WARNS("Avatar") << "Region not set, cannot request server appearance update" << LL_ENDL;
        return;
    }
    if (gAgent.getRegion()->getCentralBakeVersion() == 0)
    {
        LL_WARNS("Avatar") << "Region does not support baking" << LL_ENDL;
        return;
    }

    std::string url = gAgent.getRegion()->getCapability("UpdateAvatarAppearance");
    if (url.empty())
    {
        LL_WARNS("Agent") << "Could not retrieve region capability \"UpdateAvatarAppearance\"" << LL_ENDL;
        return;
    }

    //----------------
    if (gAgentAvatarp->isEditingAppearance())
    {
        LL_WARNS("Avatar") << "Avatar editing appearance, not sending request." << LL_ENDL;
        // don't send out appearance updates if in appearance editing mode
        return;
    }

    llcoro::suspend();
    if (LLApp::isExiting())
    {
        return;
    }
    S32 retryCount(0);
    bool bRetry;
    do
    {
        // If we have already received an update for this or higher cof version,
        // put a warning in the log and cancel the request.
        S32 cofVersion = getCOFVersion();
        S32 lastRcv = gAgentAvatarp->mLastUpdateReceivedCOFVersion;
        S32 lastReq = gAgentAvatarp->mLastUpdateRequestCOFVersion;

        LL_INFOS("Avatar") << "Requesting COF version " << cofVersion <<
            " (Last Received:" << lastRcv << ")" <<
            " (Last Requested:" << lastReq << ")" << LL_ENDL;

        if (cofVersion == LLViewerInventoryCategory::VERSION_UNKNOWN)
        {
            LL_INFOS("AVatar") << "COF version is unknown... not requesting until COF version is known." << LL_ENDL;
            return;
        }
        else
        {
            if (cofVersion <= lastRcv)
            {
                LL_WARNS("Avatar") << "Have already received update for cof version " << lastRcv
                    << " but requesting for " << cofVersion << LL_ENDL;
                return;
            }
            if (lastReq >= cofVersion)
            {
                LL_WARNS("Avatar") << "Request already in flight for cof version " << lastReq
                    << " but requesting for " << cofVersion << LL_ENDL;
                return;
            }
        }

        // Actually send the request.
        LL_DEBUGS("Avatar") << "Will send request for cof_version " << cofVersion << LL_ENDL;

        bRetry = false;
        LLCore::HttpRequest::ptr_t httpRequest(new LLCore::HttpRequest());

        if (gSavedSettings.getBOOL("DebugForceAppearanceRequestFailure"))
        {
            cofVersion += 999;
            LL_WARNS("Avatar") << "Forcing version failure on COF Baking" << LL_ENDL;
        }

        LL_INFOS("Avatar") << "Requesting bake for COF version " << cofVersion << LL_ENDL;

        LLSD postData;
        if (gSavedSettings.getBOOL("DebugAvatarExperimentalServerAppearanceUpdate"))
        {
            postData = dumpCOF();
        }
        else
        {
            postData["cof_version"] = cofVersion;
        }

        gAgentAvatarp->mLastUpdateRequestCOFVersion = cofVersion;

        LLSD result = httpAdapter->postAndSuspend(httpRequest, url, postData);

        if (LLApp::isExiting())
        {
            return;
        }

        LLSD httpResults = result[LLCoreHttpUtil::HttpCoroutineAdapter::HTTP_RESULTS];
        LLCore::HttpStatus status = LLCoreHttpUtil::HttpCoroutineAdapter::getStatusFromLLSD(httpResults);

        if (!status || !result["success"].asBoolean())
        {
            std::string message = (result.has("error")) ? result["error"].asString() : status.toString();
            LL_WARNS("Avatar") << "Appearance Failure. server responded with \"" << message << "\"" << LL_ENDL;

            // We may have requested a bake for a stale COF (especially if the inventory
            // is still updating.  If that is the case re send the request with the
            // corrected COF version.  (This may also be the case if the viewer is running
            // on multiple machines.
            if (result.has("expected"))
            {
                S32 expectedCofVersion = result["expected"].asInteger();
                LL_WARNS("Avatar") << "Server expected " << expectedCofVersion << " as COF version" << LL_ENDL;

                // Force an update texture request for ourself.  The message will return
                // through the UDP and be handled in LLVOAvatar::processAvatarAppearance
                // this should ensure that we receive a new canonical COF from the sim
                // host. Hopefully it will return before the timeout.
                LLAvatarPropertiesProcessor::getInstance()->sendAvatarTexturesRequest(gAgent.getID());

                bRetry = true;
                // Wait for a 1/2 second before trying again.  Just to keep from asking too quickly.
                if (++retryCount > BAKE_RETRY_MAX_COUNT)
                {
                    LL_WARNS("Avatar") << "Bake retry count exceeded!" << LL_ENDL;
                    break;
                }
                F32 timeout = pow(BAKE_RETRY_TIMEOUT, static_cast<float>(retryCount)) - 1.0f;

                LL_WARNS("Avatar") << "Bake retry #" << retryCount << " in " << timeout << " seconds." << LL_ENDL;

                llcoro::suspendUntilTimeout(timeout);
                if (LLApp::isExiting())
                {
                    return;
                }
                bRetry = true;
                continue;
            }
            else
            {
                LL_WARNS("Avatar") << "No retry attempted." << LL_ENDL;
                break;
            }
        }

        LL_DEBUGS("Avatar") << "succeeded" << LL_ENDL;
        if (gSavedSettings.getBOOL("DebugAvatarAppearanceMessage"))
        {
            dump_sequential_xml(gAgentAvatarp->getFullname() + "_appearance_request_ok", result);
        }

    } while (bRetry);
}

/*static*/
void LLAppearanceMgr::debugAppearanceUpdateCOF(const LLSD& content)
{
    dump_sequential_xml(gAgentAvatarp->getFullname() + "_appearance_request_error", content);

    LL_INFOS("Avatar") << "AIS COF, version received: " << content["expected"].asInteger()
        << " ================================= " << LL_ENDL;
    std::set<LLUUID> ais_items, local_items;
    const LLSD& cof_raw = content["cof_raw"];
    for (LLSD::array_const_iterator it = cof_raw.beginArray();
        it != cof_raw.endArray(); ++it)
    {
        const LLSD& item = *it;
        if (item["parent_id"].asUUID() == LLAppearanceMgr::instance().getCOF())
        {
            ais_items.insert(item["item_id"].asUUID());
            if (item["type"].asInteger() == 24) // link
            {
                LL_INFOS("Avatar") << "AIS Link: item_id: " << item["item_id"].asUUID()
                    << " linked_item_id: " << item["asset_id"].asUUID()
                    << " name: " << item["name"].asString()
                    << LL_ENDL;
            }
            else if (item["type"].asInteger() == 25) // folder link
            {
                LL_INFOS("Avatar") << "AIS Folder link: item_id: " << item["item_id"].asUUID()
                    << " linked_item_id: " << item["asset_id"].asUUID()
                    << " name: " << item["name"].asString()
                    << LL_ENDL;
            }
            else
            {
                LL_INFOS("Avatar") << "AIS Other: item_id: " << item["item_id"].asUUID()
                    << " linked_item_id: " << item["asset_id"].asUUID()
                    << " name: " << item["name"].asString()
                    << " type: " << item["type"].asInteger()
                    << LL_ENDL;
            }
        }
    }
    LL_INFOS("Avatar") << LL_ENDL;
    LL_INFOS("Avatar") << "Local COF, version requested: " << content["observed"].asInteger()
        << " ================================= " << LL_ENDL;
    LLInventoryModel::cat_array_t cat_array;
    LLInventoryModel::item_array_t item_array;
    gInventory.collectDescendents(LLAppearanceMgr::instance().getCOF(),
        cat_array, item_array, LLInventoryModel::EXCLUDE_TRASH);
    for (S32 i = 0; i < item_array.size(); i++)
    {
        const LLViewerInventoryItem* inv_item = item_array.at(i).get();
        local_items.insert(inv_item->getUUID());
        LL_INFOS("Avatar") << "LOCAL: item_id: " << inv_item->getUUID()
            << " linked_item_id: " << inv_item->getLinkedUUID()
            << " name: " << inv_item->getName()
            << " parent: " << inv_item->getParentUUID()
            << LL_ENDL;
    }
    LL_INFOS("Avatar") << " ================================= " << LL_ENDL;
    S32 local_only = 0, ais_only = 0;
    for (std::set<LLUUID>::iterator it = local_items.begin(); it != local_items.end(); ++it)
    {
        if (ais_items.find(*it) == ais_items.end())
        {
            LL_INFOS("Avatar") << "LOCAL ONLY: " << *it << LL_ENDL;
            local_only++;
        }
    }
    for (std::set<LLUUID>::iterator it = ais_items.begin(); it != ais_items.end(); ++it)
    {
        if (local_items.find(*it) == local_items.end())
        {
            LL_INFOS("Avatar") << "AIS ONLY: " << *it << LL_ENDL;
            ais_only++;
        }
    }
    if (local_only == 0 && ais_only == 0)
    {
        LL_INFOS("Avatar") << "COF contents identical, only version numbers differ (req "
            << content["observed"].asInteger()
            << " rcv " << content["expected"].asInteger()
            << ")" << LL_ENDL;
    }
}


std::string LLAppearanceMgr::getAppearanceServiceURL() const
{
    if (gSavedSettings.getString("DebugAvatarAppearanceServiceURLOverride").empty())
    {
        return mAppearanceServiceURL;
    }
    return gSavedSettings.getString("DebugAvatarAppearanceServiceURLOverride");
}

void show_created_outfit(LLUUID& folder_id, bool show_panel = true)
{
    if (!LLApp::isRunning())
    {
        LL_WARNS() << "called during shutdown, skipping" << LL_ENDL;
        return;
    }

    LL_DEBUGS("Avatar") << "called" << LL_ENDL;
    LLSD key;

    //EXT-7727. For new accounts inventory callback is created during login process
    // and may be processed after login process is finished
    if (show_panel)
    {
        LL_DEBUGS("Avatar") << "showing panel" << LL_ENDL;
        LLFloaterSidePanelContainer::showPanel("appearance", "panel_outfits_inventory", key);

    }
    LLOutfitsList *outfits_list =
        dynamic_cast<LLOutfitsList*>(LLFloaterSidePanelContainer::getPanel("appearance", "outfitslist_tab"));
    if (outfits_list)
    {
        outfits_list->setSelectedOutfitByUUID(folder_id);
    }

    LLAppearanceMgr::getInstance()->updateIsDirty();
    gAgentWearables.notifyLoadingFinished(); // New outfit is saved.
    LLAppearanceMgr::getInstance()->updatePanelOutfitName("");

    // For SSB, need to update appearance after we add a base outfit
    // link, since, the COF version has changed. There is a race
    // condition in initial outfit setup which can lead to rez
    // failures - SH-3860.
    LL_DEBUGS("Avatar") << "requesting appearance update after createBaseOutfitLink" << LL_ENDL;
    LLPointer<LLInventoryCallback> cb = new LLUpdateAppearanceOnDestroy;
    LLAppearanceMgr::getInstance()->createBaseOutfitLink(folder_id, cb);
}

void LLAppearanceMgr::onOutfitFolderCreated(const LLUUID& folder_id, bool show_panel)
{
    LLPointer<LLInventoryCallback> cb =
        new LLBoostFuncInventoryCallback(no_op_inventory_func,
                                         boost::bind(&LLAppearanceMgr::onOutfitFolderCreatedAndClothingOrdered,this,folder_id,show_panel));
    updateClothingOrderingInfo(LLUUID::null, cb);
}

void LLAppearanceMgr::onOutfitFolderCreatedAndClothingOrdered(const LLUUID& folder_id, bool show_panel)
{
    LLPointer<LLInventoryCallback> cb =
        new LLBoostFuncInventoryCallback(no_op_inventory_func,
                                         boost::bind(show_created_outfit,folder_id,show_panel));
    bool copy_folder_links = false;
    slamCategoryLinks(getCOF(), folder_id, copy_folder_links, cb);
}

void LLAppearanceMgr::makeNewOutfitLinks(const std::string& new_folder_name, bool show_panel)
{
    if (!isAgentAvatarValid()) return;

    LLUIUsage::instance().logCommand("Avatar.CreateNewOutfit");

    LL_DEBUGS("Avatar") << "creating new outfit" << LL_ENDL;

    gAgentWearables.notifyLoadingStarted();

    // First, make a folder in the My Outfits directory.
    const LLUUID parent_id = gInventory.findCategoryUUIDForType(LLFolderType::FT_MY_OUTFITS);

    gInventory.createNewCategory(
        parent_id,
        LLFolderType::FT_OUTFIT,
        new_folder_name,
        [show_panel](const LLUUID &new_cat_id)
        {
            LLAppearanceMgr::getInstance()->onOutfitFolderCreated(new_cat_id, show_panel);
        });
}

void LLAppearanceMgr::wearBaseOutfit()
{
    const LLUUID& base_outfit_id = getBaseOutfitUUID();
    if (base_outfit_id.isNull()) return;

    updateCOF(base_outfit_id);
}

void LLAppearanceMgr::removeItemsFromAvatar(const uuid_vec_t& ids_to_remove, nullary_func_t post_update_func)
{
    LL_DEBUGS("UIUsage") << "removeItemsFromAvatar" << LL_ENDL;
    LLUIUsage::instance().logCommand("Avatar.RemoveItem");

    if (ids_to_remove.empty())
    {
        LL_WARNS() << "called with empty list, nothing to do" << LL_ENDL;
        return;
    }
    LLPointer<LLInventoryCallback> cb = new LLUpdateAppearanceOnDestroy(true, true, post_update_func);
    for (uuid_vec_t::const_iterator it = ids_to_remove.begin(); it != ids_to_remove.end(); ++it)
    {
        const LLUUID& id_to_remove = *it;
        const LLUUID& linked_item_id = gInventory.getLinkedItemID(id_to_remove);
        LLViewerInventoryItem *item = gInventory.getItem(linked_item_id);
        if (item && item->getType() == LLAssetType::AT_OBJECT)
        {
            LL_DEBUGS("Avatar") << "ATT removing attachment " << item->getName() << " id " << item->getUUID() << LL_ENDL;
        }
        if (item && item->getType() == LLAssetType::AT_BODYPART)
        {
            continue;
        }
        removeCOFItemLinks(linked_item_id, cb);
        addDoomedTempAttachment(linked_item_id);
    }
}

void LLAppearanceMgr::removeItemFromAvatar(const LLUUID& id_to_remove, nullary_func_t post_update_func)
{
    uuid_vec_t ids_to_remove;
    ids_to_remove.push_back(id_to_remove);
    removeItemsFromAvatar(ids_to_remove, post_update_func);
}


// Adds the given item ID to mDoomedTempAttachmentIDs iff it's a temp attachment
void LLAppearanceMgr::addDoomedTempAttachment(const LLUUID& id_to_remove)
{
    LLViewerObject * attachmentp = gAgentAvatarp->findAttachmentByID(id_to_remove);
    if (attachmentp &&
        attachmentp->isTempAttachment())
    {   // If this is a temp attachment and we want to remove it, record the ID
        // so it will be deleted when attachments are synced up with COF
        mDoomedTempAttachmentIDs.insert(id_to_remove);
        //LL_INFOS() << "Will remove temp attachment id " << id_to_remove << LL_ENDL;
    }
}

// Find AND REMOVES the given UUID from mDoomedTempAttachmentIDs
bool LLAppearanceMgr::shouldRemoveTempAttachment(const LLUUID& item_id)
{
    doomed_temp_attachments_t::iterator iter = mDoomedTempAttachmentIDs.find(item_id);
    if (iter != mDoomedTempAttachmentIDs.end())
    {
        mDoomedTempAttachmentIDs.erase(iter);
        return true;
    }
    return false;
}


bool LLAppearanceMgr::moveWearable(LLViewerInventoryItem* item, bool closer_to_body)
{
    if (!item || !item->isWearableType()) return false;
    if (item->getType() != LLAssetType::AT_CLOTHING) return false;
    if (!gInventory.isObjectDescendentOf(item->getUUID(), getCOF())) return false;

    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    LLFindWearablesOfType filter_wearables_of_type(item->getWearableType());
    gInventory.collectDescendentsIf(getCOF(), cats, items, true, filter_wearables_of_type);
    if (items.empty()) return false;

    // We assume that the items have valid descriptions.
    std::sort(items.begin(), items.end(), WearablesOrderComparator(item->getWearableType()));

    if (closer_to_body && items.front() == item) return false;
    if (!closer_to_body && items.back() == item) return false;

    LLInventoryModel::item_array_t::iterator it = std::find(items.begin(), items.end(), item);
    if (items.end() == it) return false;


    //swapping descriptions
    closer_to_body ? --it : ++it;
    LLViewerInventoryItem* swap_item = *it;
    if (!swap_item) return false;
    std::string tmp = swap_item->getActualDescription();
    swap_item->setDescription(item->getActualDescription());
    item->setDescription(tmp);

    // LL_DEBUGS("Inventory") << "swap, item "
    //                     << ll_pretty_print_sd(item->asLLSD())
    //                     << " swap_item "
    //                     << ll_pretty_print_sd(swap_item->asLLSD()) << LL_ENDL;

    // FIXME switch to use AISv3 where supported.
    //items need to be updated on a dataserver
    item->setComplete(true);
    item->updateServer(false);
    gInventory.updateItem(item);

    swap_item->setComplete(true);
    swap_item->updateServer(false);
    gInventory.updateItem(swap_item);

    //to cause appearance of the agent to be updated
    bool result = false;
    if ((result = gAgentWearables.moveWearable(item, closer_to_body)))
    {
        gAgentAvatarp->wearableUpdated(item->getWearableType());
    }

    setOutfitDirty(true);

    //*TODO do we need to notify observers here in such a way?
    gInventory.notifyObservers();

    return result;
}

//static
void LLAppearanceMgr::sortItemsByActualDescription(LLInventoryModel::item_array_t& items)
{
    if (items.size() < 2) return;

    std::sort(items.begin(), items.end(), sort_by_actual_description);
}

//#define DUMP_CAT_VERBOSE

void LLAppearanceMgr::dumpCat(const LLUUID& cat_id, const std::string& msg)
{
    LLInventoryModel::cat_array_t cats;
    LLInventoryModel::item_array_t items;
    gInventory.collectDescendents(cat_id, cats, items, LLInventoryModel::EXCLUDE_TRASH);

#ifdef DUMP_CAT_VERBOSE
    LL_INFOS() << LL_ENDL;
    LL_INFOS() << str << LL_ENDL;
    S32 hitcount = 0;
    for(S32 i=0; i<items.size(); i++)
    {
        LLViewerInventoryItem *item = items.get(i);
        if (item)
            hitcount++;
        LL_INFOS() << i <<" "<< item->getName() <<LL_ENDL;
    }
#endif
    LL_INFOS() << msg << " count " << items.size() << LL_ENDL;
}

void LLAppearanceMgr::dumpItemArray(const LLInventoryModel::item_array_t& items,
                                    const std::string& msg)
{
    for (S32 i=0; i<items.size(); i++)
    {
        LLViewerInventoryItem *item = items.at(i);
        LLViewerInventoryItem *linked_item = item ? item->getLinkedItem() : NULL;
        LLUUID asset_id;
        if (linked_item)
        {
            asset_id = linked_item->getAssetUUID();
        }
        LL_DEBUGS("Avatar") << self_av_string() << msg << " " << i <<" " << (item ? item->getName() : "(nullitem)") << " " << asset_id.asString() << LL_ENDL;
    }
}

bool LLAppearanceMgr::mActive = true;

LLAppearanceMgr::LLAppearanceMgr():
    mAttachmentInvLinkEnabled(false),
    mOutfitIsDirty(false),
    mOutfitLocked(false),
    mInFlightTimer(),
    mIsInUpdateAppearanceFromCOF(false),
    mOutstandingAppearanceBakeRequest(false),
    mRerequestAppearanceBake(false)
{
    LLOutfitObserver& outfit_observer = LLOutfitObserver::instance();
    // unlock outfit on save operation completed
    outfit_observer.addCOFSavedCallback(boost::bind(
            &LLAppearanceMgr::setOutfitLocked, this, false));

    mUnlockOutfitTimer.reset(new LLOutfitUnLockTimer((F32)gSavedSettings.getS32(
            "OutfitOperationsTimeout")));

    gIdleCallbacks.addFunction(&LLAttachmentsMgr::onIdle, NULL);
    gIdleCallbacks.addFunction(&LLAppearanceMgr::onIdle, NULL); //sheduling appearance update requests
}

LLAppearanceMgr::~LLAppearanceMgr()
{
    mActive = false;
}

void LLAppearanceMgr::setAttachmentInvLinkEnable(bool val)
{
    LL_DEBUGS("Avatar") << "setAttachmentInvLinkEnable => " << (int) val << LL_ENDL;
    mAttachmentInvLinkEnabled = val;
}
boost::signals2::connection LLAppearanceMgr::setAttachmentsChangedCallback(attachments_changed_callback_t cb)
{
    return mAttachmentsChangeSignal.connect(cb);
}

void dumpAttachmentSet(const std::set<LLUUID>& atts, const std::string& msg)
{
       LL_INFOS() << msg << LL_ENDL;
       for (std::set<LLUUID>::const_iterator it = atts.begin();
               it != atts.end();
               ++it)
       {
               LLUUID item_id = *it;
               LLViewerInventoryItem *item = gInventory.getItem(item_id);
               if (item)
                       LL_INFOS() << "atts " << item->getName() << LL_ENDL;
               else
                       LL_INFOS() << "atts " << "UNKNOWN[" << item_id.asString() << "]" << LL_ENDL;
       }
       LL_INFOS() << LL_ENDL;
}

void LLAppearanceMgr::registerAttachment(const LLUUID& item_id)
{
    LLViewerInventoryItem *item = gInventory.getItem(item_id);
    LL_DEBUGS("Avatar") << "ATT registering attachment "
                        << (item ? item->getName() : "UNKNOWN") << " " << item_id << LL_ENDL;
    gInventory.addChangedMask(LLInventoryObserver::LABEL, item_id);

    LLAttachmentsMgr::instance().onAttachmentArrived(item_id);

    mAttachmentsChangeSignal();
}

void LLAppearanceMgr::unregisterAttachment(const LLUUID& item_id)
{
    LLViewerInventoryItem *item = gInventory.getItem(item_id);
    LL_DEBUGS("Avatar") << "ATT unregistering attachment "
                        << (item ? item->getName() : "UNKNOWN") << " " << item_id << LL_ENDL;
    gInventory.addChangedMask(LLInventoryObserver::LABEL, item_id);

    LLAttachmentsMgr::instance().onDetachCompleted(item_id);
    if (mAttachmentInvLinkEnabled && isLinkedInCOF(item_id))
    {
        LL_DEBUGS("Avatar") << "ATT removing COF link for attachment "
                            << (item ? item->getName() : "UNKNOWN") << " " << item_id << LL_ENDL;
        LLAppearanceMgr::removeCOFItemLinks(item_id);
    }
    else
    {
        //LL_INFOS() << "no link changes, inv link not enabled" << LL_ENDL;
    }

    mAttachmentsChangeSignal();
}

bool LLAppearanceMgr::getIsInCOF(const LLUUID& obj_id) const
{
    const LLUUID& cof = getCOF();
    if (obj_id == cof)
        return true;
    const LLInventoryObject* obj = gInventory.getObject(obj_id);
    if (obj && obj->getParentUUID() == cof)
        return true;
    return false;
}

bool LLAppearanceMgr::getIsInCOF(const LLInventoryObject* obj) const
{
    const LLUUID& cof = getCOF();
    if (obj->getUUID() == cof)
        return true;
    if (obj && obj->getParentUUID() == cof)
        return true;
    return false;
}

bool LLAppearanceMgr::getIsProtectedCOFItem(const LLUUID& obj_id) const
{
    if (!getIsInCOF(obj_id)) return false;

    // If a non-link somehow ended up in COF, allow deletion.
    const LLInventoryObject *obj = gInventory.getObject(obj_id);
    if (obj && !obj->getIsLinkType())
    {
        return false;
    }

    // For now, don't allow direct deletion from the COF.  Instead, force users
    // to choose "Detach" or "Take Off".
    return true;
}

bool LLAppearanceMgr::getIsProtectedCOFItem(const LLInventoryObject* obj) const
{
    if (!getIsInCOF(obj)) return false;

    // If a non-link somehow ended up in COF, allow deletion.
    if (obj && !obj->getIsLinkType())
    {
        return false;
    }

    // For now, don't allow direct deletion from the COF.  Instead, force users
    // to choose "Detach" or "Take Off".
    return true;
}

class CallAfterCategoryFetchStage2: public LLInventoryFetchItemsObserver
{
public:
    CallAfterCategoryFetchStage2(const uuid_vec_t& ids,
                                 nullary_func_t callable) :
        LLInventoryFetchItemsObserver(ids),
        mCallable(callable)
    {
    }
    ~CallAfterCategoryFetchStage2()
    {
    }
    virtual void done()
    {
        LL_INFOS() << this << " done with incomplete " << mIncomplete.size()
                << " complete " << mComplete.size() <<  " calling callable" << LL_ENDL;

        gInventory.removeObserver(this);
        doOnIdleOneTime(mCallable);
        delete this;
    }
protected:
    nullary_func_t mCallable;
};

class CallAfterCategoryFetchStage1: public LLInventoryFetchDescendentsObserver
{
public:
    CallAfterCategoryFetchStage1(const LLUUID& cat_id, nullary_func_t callable) :
        LLInventoryFetchDescendentsObserver(cat_id),
        mCallable(callable)
    {
    }
    ~CallAfterCategoryFetchStage1()
    {
    }
    /*virtual*/ void startFetch()
    {
        bool ais3 = AISAPI::isAvailable();
        for (uuid_vec_t::const_iterator it = mIDs.begin(); it != mIDs.end(); ++it)
        {
            LLViewerInventoryCategory* cat = gInventory.getCategory(*it);
            if (!cat) continue;
            if (cat->getVersion() == LLViewerInventoryCategory::VERSION_UNKNOWN)
            {
                // CHECK IT: isCategoryComplete() checks both version and descendant count but
                // fetch() only works for Unknown version and doesn't care about descentants,
                // as result fetch won't start and folder will potentially get stuck as
                // incomplete in observer.
                // Likely either both should use only version or both should check descendants.
                cat->fetch();       //blindly fetch it without seeing if anything else is fetching it.
                mIncomplete.push_back(*it); //Add to list of things being downloaded for this observer.
            }
            else if (!isCategoryComplete(cat))
            {
                LL_DEBUGS("Inventory") << "Categoty " << *it << " incomplete despite having version" << LL_ENDL;
                LLInventoryModelBackgroundFetch::instance().scheduleFolderFetch(*it, true);
                mIncomplete.push_back(*it);
            }
            else if (ais3)
            {
                LLInventoryModel::cat_array_t* cats;
                LLInventoryModel::item_array_t* items;
                gInventory.getDirectDescendentsOf(cat->getUUID(), cats, items);

                if (items)
                {
                    S32 complete_count = 0;
                    S32 incomplete_count = 0;
                    for (LLInventoryModel::item_array_t::const_iterator it = items->begin(); it < items->end(); ++it)
                    {
                        if (!(*it)->isFinished())
                        {
                            incomplete_count++;
                        }
                        else
                        {
                            complete_count++;
                        }
                    }
                    // AIS can fetch couple items, but if there
                    // is more than a dozen it will be very slow
                    // it's faster to get whole folder in such case
                    if (incomplete_count > LLInventoryFetchItemsObserver::MAX_INDIVIDUAL_ITEM_REQUESTS
                        || (incomplete_count > 1 && complete_count == 0))
                    {
                        LLInventoryModelBackgroundFetch::instance().scheduleFolderFetch(*it, true);
                        mIncomplete.push_back(*it);
                    }
                    else
                    {
                        // let stage2 handle incomplete ones
                        mComplete.push_back(*it);
                    }
                }
                // else should have been handled by isCategoryComplete
            }
            else
            {
                mComplete.push_back(*it);
            }
        }
    }
    virtual void done()
    {
        if (mComplete.size() <= 0)
        {
            // Ex: timeout
            LL_WARNS() << "Failed to load data. Removing observer " << LL_ENDL;
            gInventory.removeObserver(this);
            doOnIdleOneTime(mCallable);

            delete this;
            return;
        }

        // What we do here is get the complete information on the
        // items in the requested category, and set up an observer
        // that will wait for that to happen.
        LLInventoryModel::cat_array_t* cats;
        LLInventoryModel::item_array_t* items;
        gInventory.getDirectDescendentsOf(mComplete.front(), cats, items);

        auto count = items->size();
        if(!count)
        {
            LL_WARNS() << "Nothing fetched in category " << mComplete.front()
                    << LL_ENDL;
            gInventory.removeObserver(this);
            doOnIdleOneTime(mCallable);

            delete this;
            return;
        }

        LLViewerInventoryCategory* cat = gInventory.getCategory(mComplete.front());
        S32 version = cat ? cat->getVersion() : -2;
        LL_INFOS() << "stage1, category " << mComplete.front() << " got " << count << " items, version " << version << " passing to stage2 " << LL_ENDL;
        uuid_vec_t ids;
        for(size_t i = 0; i < count; ++i)
        {
            ids.push_back(items->at(i)->getUUID());
        }

        gInventory.removeObserver(this);

        // do the fetch
        CallAfterCategoryFetchStage2 *stage2 = new CallAfterCategoryFetchStage2(ids, mCallable);
        stage2->startFetch();
        if(stage2->isFinished())
        {
            // everything is already here - call done.
            stage2->done();
        }
        else
        {
            // it's all on it's way - add an observer, and the inventory
            // will call done for us when everything is here.
            gInventory.addObserver(stage2);
        }
        delete this;
    }
protected:
    nullary_func_t mCallable;
};

void callAfterCOFFetch(nullary_func_t cb)
{
    if (AISAPI::isAvailable())
    {
        // For reliability assume that we have no relevant cache, so
        // fetch cof along with items cof's links point to.
        LLInventoryModelBackgroundFetch::getInstance()->fetchCOF(cb);
    }
    else
    {
        LL_INFOS() << "AIS API v3 not available, using callAfterCategoryFetch" << LL_ENDL;
        LLUUID cat_id = LLAppearanceMgr::instance().getCOF();
        LLViewerInventoryCategory* cat = gInventory.getCategory(cat_id);

        // Special case, startup should have marked cof as FETCH_RECURSIVE
        // to prevent dupplicate request, remove that
        cat->setFetching(LLViewerInventoryCategory::FETCH_NONE);
        callAfterCategoryFetch(cat_id, cb);
    }
}

void callAfterCategoryFetch(const LLUUID& cat_id, nullary_func_t cb)
{
    CallAfterCategoryFetchStage1* stage1 = new CallAfterCategoryFetchStage1(cat_id, cb);
    stage1->startFetch();
    if (stage1->isFinished())
    {
        stage1->done();
    }
    else
    {
        gInventory.addObserver(stage1);
    }
}

void callAfterCategoryLinksFetch(const LLUUID &cat_id, nullary_func_t cb)
{
    if (AISAPI::isAvailable())
    {
        // Assume that we have no relevant cache. Fetch folder, and items folder's links point to.
        LLInventoryModelBackgroundFetch::getInstance()->fetchFolderAndLinks(cat_id, cb);
    }
    else
    {
        LL_WARNS() << "AIS API v3 not available, can't use AISAPI::FetchCOF" << LL_ENDL;
        callAfterCategoryFetch(cat_id, cb);
    }

}

void add_wearable_type_counts(const uuid_vec_t& ids,
                              S32& clothing_count,
                              S32& bodypart_count,
                              S32& object_count,
                              S32& other_count)
{
    for (uuid_vec_t::const_iterator it = ids.begin(); it != ids.end(); ++it)
    {
        const LLUUID& item_id_to_wear = *it;
        LLViewerInventoryItem* item_to_wear = gInventory.getItem(item_id_to_wear);
        if (item_to_wear)
        {
            if (item_to_wear->getType() == LLAssetType::AT_CLOTHING)
            {
                clothing_count++;
            }
            else if (item_to_wear->getType() == LLAssetType::AT_BODYPART)
            {
                bodypart_count++;
            }
            else if (item_to_wear->getType() == LLAssetType::AT_OBJECT)
            {
                object_count++;
            }
            else
            {
                other_count++;
            }
        }
        else
        {
            other_count++;
        }
    }
}

void wear_multiple(const uuid_vec_t& ids, bool replace)
{
    S32 clothing_count = 0;
    S32 bodypart_count = 0;
    S32 object_count = 0;
    S32 other_count = 0;
    add_wearable_type_counts(ids, clothing_count, bodypart_count, object_count, other_count);

    LLPointer<LLInventoryCallback> cb = NULL;
    if (clothing_count > 0 || bodypart_count > 0)
    {
        cb = new LLUpdateAppearanceOnDestroy;
    }
    LLAppearanceMgr::instance().wearItemsOnAvatar(ids, true, replace, cb);
}

// SLapp for easy-wearing of a stock (library) avatar
//
class LLWearFolderHandler : public LLCommandHandler
{
public:
    // not allowed from outside the app
    LLWearFolderHandler() : LLCommandHandler("wear_folder", UNTRUSTED_BLOCK) { }

    bool handle(const LLSD& tokens,
                const LLSD& query_map,
                const std::string& grid,
                LLMediaCtrl* web)
    {
        LLSD::UUID folder_uuid;

        if (folder_uuid.isNull() && query_map.has("folder_name"))
        {
            std::string outfit_folder_name = query_map["folder_name"];
            folder_uuid = findDescendentCategoryIDByName(
                gInventory.getLibraryRootFolderID(),
                outfit_folder_name);
        }
        if (folder_uuid.isNull() && query_map.has("folder_id"))
        {
            folder_uuid = query_map["folder_id"].asUUID();
        }

        if (folder_uuid.notNull())
        {
            LLPointer<LLInventoryCategory> category = new LLInventoryCategory(folder_uuid,
                                                                              LLUUID::null,
                                                                              LLFolderType::FT_CLOTHING,
                                                                              "Quick Appearance");
            if ( gInventory.getCategory( folder_uuid ) != NULL )
            {
                // Assume this is coming from the predefined avatars web floater
                LLUIUsage::instance().logCommand("Avatar.WearPredefinedAppearance");
                LLAppearanceMgr::getInstance()->wearInventoryCategory(category, true, false);

                // *TODOw: This may not be necessary if initial outfit is chosen already -- josh
                gAgent.setOutfitChosen(true);
            }
        }

        // release avatar picker keyboard focus
        gFocusMgr.setKeyboardFocus( NULL );

        return true;
    }
};

LLWearFolderHandler gWearFolderHandler;