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

#include "llviewerprecompiledheaders.h"

#include "llavatarlist.h"

// common
#include "lltrans.h"
#include "llcommonutils.h"

// llui
#include "lltextutil.h"

// newview
#include "llagent.h"
#include "llagentdata.h" // for comparator
#include "llavatariconctrl.h"
#include "llavatarnamecache.h"
#include "llcallingcard.h" // for LLAvatarTracker
#include "llcachename.h"
#include "lllistcontextmenu.h"
#include "llrecentpeople.h"
#include "lluuid.h"
#include "llvoiceclient.h"
#include "llviewercontrol.h"    // for gSavedSettings
#include "lltooldraganddrop.h"
#include "llworld.h"

static LLDefaultChildRegistry::Register<LLAvatarList> r("avatar_list");

// Last interaction time update period.
static const F32 LIT_UPDATE_PERIOD = 5;

// Maximum number of avatars that can be added to a list in one pass.
// Used to limit time spent for avatar list update per frame.
static const unsigned ADD_LIMIT = 50;

bool LLAvatarList::contains(const LLUUID& id)
{
    const uuid_vec_t& ids = getIDs();
    return std::find(ids.begin(), ids.end(), id) != ids.end();
}

void LLAvatarList::toggleIcons()
{
    // Save the new value for new items to use.
    mShowIcons = !mShowIcons;
    gSavedSettings.setBOOL(mIconParamName, mShowIcons);

    // Show/hide icons for all existing items.
    std::vector<LLPanel*> items;
    getItems(items);
    for( std::vector<LLPanel*>::const_iterator it = items.begin(); it != items.end(); it++)
    {
        static_cast<LLAvatarListItem*>(*it)->setAvatarIconVisible(mShowIcons);
    }
}

void LLAvatarList::setSpeakingIndicatorsVisible(bool visible)
{
    // Save the new value for new items to use.
    mShowSpeakingIndicator = visible;

    // Show/hide icons for all existing items.
    std::vector<LLPanel*> items;
    getItems(items);
    for( std::vector<LLPanel*>::const_iterator it = items.begin(); it != items.end(); it++)
    {
        static_cast<LLAvatarListItem*>(*it)->showSpeakingIndicator(mShowSpeakingIndicator);
    }
}

void LLAvatarList::showPermissions(bool visible)
{
    // Save the value for new items to use.
    mShowPermissions = visible;

    // Enable or disable showing permissions icons for all existing items.
    std::vector<LLPanel*> items;
    getItems(items);
    for(std::vector<LLPanel*>::const_iterator it = items.begin(), end_it = items.end(); it != end_it; ++it)
    {
        static_cast<LLAvatarListItem*>(*it)->setShowPermissions(mShowPermissions);
    }
}

static bool findInsensitive(std::string haystack, const std::string& needle_upper)
{
    LLStringUtil::toUpper(haystack);
    return haystack.find(needle_upper) != std::string::npos;
}


//comparators
static const LLAvatarItemNameComparator NAME_COMPARATOR;
static const LLFlatListView::ItemReverseComparator REVERSE_NAME_COMPARATOR(NAME_COMPARATOR);

LLAvatarList::Params::Params()
: ignore_online_status("ignore_online_status", false)
, show_avatar_distance("show_avatar_distance", false)
, show_last_interaction_time("show_last_interaction_time", false)
, show_info_btn("show_info_btn", true)
, show_profile_btn("show_profile_btn", true)
, show_speaking_indicator("show_speaking_indicator", true)
, show_permissions_granted("show_permissions_granted", false)
{
}

LLAvatarList::LLAvatarList(const Params& p)
:   LLFlatListViewEx(p)
, mIgnoreOnlineStatus(p.ignore_online_status)
, mShowLastInteractionTime(p.show_last_interaction_time)
, mAvatarDistance(p.show_avatar_distance)
, mContextMenu(NULL)
, mDirty(true) // to force initial update
, mNeedUpdateNames(false)
, mLITUpdateTimer(NULL)
, mShowIcons(true)
, mShowInfoBtn(p.show_info_btn)
, mShowProfileBtn(p.show_profile_btn)
, mShowSpeakingIndicator(p.show_speaking_indicator)
, mShowPermissions(p.show_permissions_granted)
, mShowCompleteName(false)
{
    setCommitOnSelectionChange(true);

    // Set default sort order.
    setComparator(&NAME_COMPARATOR);

    if (mShowLastInteractionTime || mAvatarDistance)
    {
        mLITUpdateTimer = new LLTimer();
        mLITUpdateTimer->setTimerExpirySec(0); // zero to force initial update
        mLITUpdateTimer->start();
    }

    LLAvatarNameCache::getInstance()->addUseDisplayNamesCallback(boost::bind(&LLAvatarList::handleDisplayNamesOptionChanged, this));
}


void LLAvatarList::handleDisplayNamesOptionChanged()
{
    mNeedUpdateNames = true;
}


LLAvatarList::~LLAvatarList()
{
    delete mLITUpdateTimer;
}

void LLAvatarList::setShowIcons(std::string param_name)
{
    mIconParamName= param_name;
    mShowIcons = gSavedSettings.getBOOL(mIconParamName);
}

std::string LLAvatarList::getAvatarName(LLAvatarName av_name)
{
    return mShowCompleteName? av_name.getCompleteName(false) : av_name.getDisplayName();
}

// virtual
void LLAvatarList::draw()
{
    // *NOTE dzaporozhan
    // Call refresh() after draw() to avoid flickering of avatar list items.

    LLFlatListViewEx::draw();

    if (mNeedUpdateNames)
    {
        updateAvatarNames();
    }

    if (mDirty)
        refresh();

    if ((mShowLastInteractionTime || mAvatarDistance) && mLITUpdateTimer->hasExpired())
    {
        if (mAvatarDistance)
        {
            updateAvatarDistance();
        }
        if (mShowLastInteractionTime)
        {
        updateLastInteractionTimes();
        }
        mLITUpdateTimer->setTimerExpirySec(LIT_UPDATE_PERIOD); // restart the timer
    }
}

//virtual
void LLAvatarList::clear()
{
    getIDs().clear();
    setDirty(true);
    LLFlatListViewEx::clear();
}

void LLAvatarList::setNameFilter(const std::string& filter)
{
    std::string filter_upper = filter;
    LLStringUtil::toUpper(filter_upper);
    if (mNameFilter != filter_upper)
    {
        mNameFilter = filter_upper;

        // update message for empty state here instead of refresh() to avoid blinking when switch
        // between tabs.
        updateNoItemsMessage(filter);
        setDirty();
    }
}

void LLAvatarList::sortByName()
{
    setComparator(&NAME_COMPARATOR);
    sort();
}

void LLAvatarList::setDirty(bool val /*= true*/, bool force_refresh /*= false*/)
{
    mDirty = val;
    if(mDirty && force_refresh)
    {
        refresh();
    }
}

//////////////////////////////////////////////////////////////////////////
// PROTECTED SECTION
//////////////////////////////////////////////////////////////////////////
void LLAvatarList::refresh()
{
    bool have_names         = true;
    bool add_limit_exceeded = false;
    bool modified           = false;
    bool have_filter        = !mNameFilter.empty();

    // Save selection.
    uuid_vec_t selected_ids;
    getSelectedUUIDs(selected_ids);
    LLUUID current_id = getSelectedUUID();

    // Determine what to add and what to remove.
    uuid_vec_t added, removed;
    LLAvatarList::computeDifference(getIDs(), added, removed);

    // Handle added items.
    unsigned nadded = 0;
    const std::string waiting_str = LLTrans::getString("AvatarNameWaiting");

    for (uuid_vec_t::const_iterator it=added.begin(); it != added.end(); it++)
    {
        const LLUUID& buddy_id = *it;
        LLAvatarName av_name;
        have_names &= LLAvatarNameCache::get(buddy_id, &av_name);

        if (!have_filter || findInsensitive(getAvatarName(av_name), mNameFilter))
        {
            if (nadded >= ADD_LIMIT)
            {
                add_limit_exceeded = true;
                break;
            }
            else
            {
                // *NOTE: If you change the UI to show a different string,
                // be sure to change the filter code below.
                std::string display_name = getAvatarName(av_name);
                addNewItem(buddy_id,
                    display_name.empty() ? waiting_str : display_name,
                    LLAvatarTracker::instance().isBuddyOnline(buddy_id));

                modified = true;
                nadded++;
            }
        }
    }

    // Handle removed items.
    for (uuid_vec_t::const_iterator it=removed.begin(); it != removed.end(); it++)
    {
        removeItemByUUID(*it);
        modified = true;
    }

    // Handle filter.
    if (have_filter)
    {
        std::vector<LLSD> cur_values;
        getValues(cur_values);

        for (std::vector<LLSD>::const_iterator it=cur_values.begin(); it != cur_values.end(); it++)
        {
            const LLUUID& buddy_id = it->asUUID();
            LLAvatarName av_name;
            have_names &= LLAvatarNameCache::get(buddy_id, &av_name);
            if (!findInsensitive(getAvatarName(av_name), mNameFilter))
            {
                removeItemByUUID(buddy_id);
                modified = true;
            }
        }
    }

    // Changed item in place, need to request sort and update columns
    // because we might have changed data in a column on which the user
    // has already sorted. JC
    sort();

    // re-select items
    //  selectMultiple(selected_ids); // TODO: implement in LLFlatListView if need
    selectItemByUUID(current_id);

    // If the name filter is specified and the names are incomplete,
    // we need to re-update when the names are complete so that
    // the filter can be applied correctly.
    //
    // Otherwise, if we have no filter then no need to update again
    // because the items will update their names.
    bool dirty = add_limit_exceeded || (have_filter && !have_names);
    setDirty(dirty);

    // Refreshed all items.
    if(!dirty)
    {
        // Highlight items matching the filter.
        std::vector<LLPanel*> items;
        getItems(items);
        for( std::vector<LLPanel*>::const_iterator it = items.begin(); it != items.end(); it++)
        {
            static_cast<LLAvatarListItem*>(*it)->setHighlight(mNameFilter);
        }

        // Send refresh_complete signal.
        mRefreshCompleteSignal(this, LLSD((S32)size(false)));
    }

    // Commit if we've added/removed items.
    if (modified)
        onCommit();
}

void LLAvatarList::updateAvatarNames()
{
    std::vector<LLPanel*> items;
    getItems(items);

    for( std::vector<LLPanel*>::const_iterator it = items.begin(); it != items.end(); it++)
    {
        LLAvatarListItem* item = static_cast<LLAvatarListItem*>(*it);
        item->setShowCompleteName(mShowCompleteName);
        item->updateAvatarName();
    }
    mNeedUpdateNames = false;
}


bool LLAvatarList::filterHasMatches()
{
    uuid_vec_t values = getIDs();

    for (uuid_vec_t::const_iterator it=values.begin(); it != values.end(); it++)
    {
        const LLUUID& buddy_id = *it;
        LLAvatarName av_name;
        bool have_name = LLAvatarNameCache::get(buddy_id, &av_name);

        // If name has not been loaded yet we consider it as a match.
        // When the name will be loaded the filter will be applied again(in refresh()).

        if (have_name && !findInsensitive(getAvatarName(av_name), mNameFilter))
        {
            continue;
        }

        return true;
    }
    return false;
}

boost::signals2::connection LLAvatarList::setRefreshCompleteCallback(const commit_signal_t::slot_type& cb)
{
    return mRefreshCompleteSignal.connect(cb);
}

boost::signals2::connection LLAvatarList::setItemDoubleClickCallback(const mouse_signal_t::slot_type& cb)
{
    return mItemDoubleClickSignal.connect(cb);
}

//virtual
S32 LLAvatarList::notifyParent(const LLSD& info)
{
    if (info.has("sort") && &NAME_COMPARATOR == mItemComparator)
    {
        sort();
        return 1;
    }
    return LLFlatListViewEx::notifyParent(info);
}

void LLAvatarList::addNewItem(const LLUUID& id, const std::string& name, bool is_online, EAddPosition pos)
{
    LLAvatarListItem* item = new LLAvatarListItem();
    item->setShowCompleteName(mShowCompleteName);
    // This sets the name as a side effect
    item->setAvatarId(id, mSessionID, mIgnoreOnlineStatus);
    item->setOnline(mIgnoreOnlineStatus ? true : is_online);
    item->showAvatarDistance(mAvatarDistance);
    item->showLastInteractionTime(mShowLastInteractionTime);

    item->setAvatarIconVisible(mShowIcons);
    item->setShowInfoBtn(mShowInfoBtn);
    item->setShowProfileBtn(mShowProfileBtn);
    item->showSpeakingIndicator(mShowSpeakingIndicator);
    item->setShowPermissions(mShowPermissions);


    item->setDoubleClickCallback(boost::bind(&LLAvatarList::onItemDoubleClicked, this, _1, _2, _3, _4));

    addItem(item, id, pos);
}

// virtual
bool LLAvatarList::handleRightMouseDown(S32 x, S32 y, MASK mask)
{
    bool handled = LLUICtrl::handleRightMouseDown(x, y, mask);
    if ( mContextMenu)
    {
        uuid_vec_t selected_uuids;
        getSelectedUUIDs(selected_uuids);
        mContextMenu->show(this, selected_uuids, x, y);
    }
    return handled;
}

bool LLAvatarList::handleMouseDown(S32 x, S32 y, MASK mask)
{
    gFocusMgr.setMouseCapture(this);

    S32 screen_x;
    S32 screen_y;
    localPointToScreen(x, y, &screen_x, &screen_y);
    LLToolDragAndDrop::getInstance()->setDragStart(screen_x, screen_y);

    return LLFlatListViewEx::handleMouseDown(x, y, mask);
}

bool LLAvatarList::handleMouseUp( S32 x, S32 y, MASK mask )
{
    if(hasMouseCapture())
    {
        gFocusMgr.setMouseCapture(NULL);
    }

    return LLFlatListViewEx::handleMouseUp(x, y, mask);
}

bool LLAvatarList::handleHover(S32 x, S32 y, MASK mask)
{
    bool handled = hasMouseCapture();
    if(handled)
    {
        S32 screen_x;
        S32 screen_y;
        localPointToScreen(x, y, &screen_x, &screen_y);

        if(LLToolDragAndDrop::getInstance()->isOverThreshold(screen_x, screen_y))
        {
            // First, create the global drag and drop object
            std::vector<EDragAndDropType> types;
            uuid_vec_t cargo_ids;
            getSelectedUUIDs(cargo_ids);
            types.resize(cargo_ids.size(), DAD_PERSON);
            LLToolDragAndDrop::ESource src = LLToolDragAndDrop::SOURCE_PEOPLE;
            LLToolDragAndDrop::getInstance()->beginMultiDrag(types, cargo_ids, src);
        }
    }

    if(!handled)
    {
        handled = LLFlatListViewEx::handleHover(x, y, mask);
    }

    return handled;
}

void LLAvatarList::setVisible(bool visible)
{
    if (!visible && mContextMenu )
    {
        mContextMenu->hide();
    }
    LLFlatListViewEx::setVisible(visible);
}

void LLAvatarList::computeDifference(
    const uuid_vec_t& vnew_unsorted,
    uuid_vec_t& vadded,
    uuid_vec_t& vremoved)
{
    uuid_vec_t vcur;

    // Convert LLSDs to LLUUIDs.
    {
        std::vector<LLSD> vcur_values;
        getValues(vcur_values);

        for (size_t i=0; i<vcur_values.size(); i++)
            vcur.push_back(vcur_values[i].asUUID());
    }

    LLCommonUtils::computeDifference(vnew_unsorted, vcur, vadded, vremoved);
}

void LLAvatarList::updateAvatarDistance()
{
    std::vector<LLPanel*> items;
    getItems(items);
    auto uuids = getIDs();
    std::vector<LLVector3d> positions;
    auto me_pos = gAgent.getPositionGlobal();
    LLWorld::getInstance()->getAvatars(&uuids, &positions, me_pos, gSavedSettings.getF32("MPVNearMeRange"));
    std::map <LLUUID, LLVector3d> avatarsPositions;
    auto pos_it = positions.begin();
    auto id_it = uuids.begin();
    for (;pos_it != positions.end() && id_it != uuids.end(); ++pos_it, ++id_it)
    {
        avatarsPositions[*id_it] = *pos_it;
    }
    for (auto it = items.begin(); it != items.end(); it++)
    {
        auto item = static_cast<LLAvatarListItem*>(*it);
        item->setAvatarDistance(dist_vec(avatarsPositions[item->getAvatarId()], me_pos));
    }
}

// Refresh shown time of our last interaction with all listed avatars.
void LLAvatarList::updateLastInteractionTimes()
{
    S32 now = (S32) LLDate::now().secondsSinceEpoch();
    std::vector<LLPanel*> items;
    getItems(items);

    for( std::vector<LLPanel*>::const_iterator it = items.begin(); it != items.end(); it++)
    {
        // *TODO: error handling
        LLAvatarListItem* item = static_cast<LLAvatarListItem*>(*it);
        S32 secs_since = now - (S32) LLRecentPeople::instance().getDate(item->getAvatarId()).secondsSinceEpoch();
        if (secs_since >= 0)
            item->setLastInteractionTime(secs_since);
    }
}

void LLAvatarList::onItemDoubleClicked(LLUICtrl* ctrl, S32 x, S32 y, MASK mask)
{
    mItemDoubleClickSignal(ctrl, x, y, mask);
}

bool LLAvatarItemComparator::compare(const LLPanel* item1, const LLPanel* item2) const
{
    const LLAvatarListItem* avatar_item1 = dynamic_cast<const LLAvatarListItem*>(item1);
    const LLAvatarListItem* avatar_item2 = dynamic_cast<const LLAvatarListItem*>(item2);

    if (!avatar_item1 || !avatar_item2)
    {
        LL_ERRS() << "item1 and item2 cannot be null" << LL_ENDL;
        return true;
    }

    return doCompare(avatar_item1, avatar_item2);
}

bool LLAvatarItemNameComparator::doCompare(const LLAvatarListItem* avatar_item1, const LLAvatarListItem* avatar_item2) const
{
    std::string name1 = avatar_item1->getAvatarName();
    std::string name2 = avatar_item2->getAvatarName();

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

    return name1 < name2;
}
bool LLAvatarItemAgentOnTopComparator::doCompare(const LLAvatarListItem* avatar_item1, const LLAvatarListItem* avatar_item2) const
{
    //keep agent on top, if first is agent,
    //then we need to return true to elevate this id, otherwise false.
    if(avatar_item1->getAvatarId() == gAgentID)
    {
        return true;
    }
    else if (avatar_item2->getAvatarId() == gAgentID)
    {
        return false;
    }
    return LLAvatarItemNameComparator::doCompare(avatar_item1,avatar_item2);
}