/**
 * @file llpanelnearbymedia.cpp
 * @brief Management interface for muting and controlling nearby media
 *
 * $LicenseInfo:firstyear=2005&license=viewerlgpl$
 * 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 "llpanelnearbymedia.h"

#include "llaudioengine.h"
#include "llbase64.h"
#include "llcheckboxctrl.h"
#include "llclipboard.h"
#include "llcombobox.h"
#include "llresizebar.h"
#include "llresizehandle.h"
#include "llscrolllistctrl.h"
#include "llscrolllistitem.h"
#include "llscrolllistcell.h"
#include "llslider.h"
#include "llsliderctrl.h"
#include "llagent.h"
#include "llagentui.h"
#include "llbutton.h"
#include "lltextbox.h"
#include "llviewermedia.h"
#include "llviewerparcelaskplay.h"
#include "llviewerparcelmedia.h"
#include "llviewerregion.h"
#include "llviewermediafocus.h"
#include "llviewerparcelmgr.h"
#include "llparcel.h"
#include "llpluginclassmedia.h"
#include "llvovolume.h"
#include "llstatusbar.h"
#include "llsdutil.h"
#include "lltoggleablemenu.h"
#include "llvieweraudio.h"
#include "llviewermenu.h"

#include "llfloaterreg.h"
#include "llfloaterpreference.h" // for the gear icon
#include "lltabcontainer.h"

#include <stringize.h>

extern LLControlGroup gSavedSettings;

static const LLUUID PARCEL_MEDIA_LIST_ITEM_UUID = LLUUID("CAB5920F-E484-4233-8621-384CF373A321");
static const LLUUID PARCEL_AUDIO_LIST_ITEM_UUID = LLUUID("DF4B020D-8A24-4B95-AB5D-CA970D694822");

//
// LLPanelNearByMedia
//


LLPanelNearByMedia::LLPanelNearByMedia()
:   mMediaList(NULL),
      mEnableAllCtrl(NULL),
      mDebugInfoVisible(false),
      mParcelMediaItem(NULL),
      mParcelAudioItem(NULL),
      mMoreLessBtn(NULL)
{
    // This is just an initial value, mParcelAudioAutoStart does not affect ParcelMediaAutoPlayEnable
    mParcelAudioAutoStart = gSavedSettings.getS32("ParcelMediaAutoPlayEnable") != 0
                            && gSavedSettings.getBOOL("MediaTentativeAutoPlay");

    gSavedSettings.getControl("ParcelMediaAutoPlayEnable")->getSignal()->connect(boost::bind(&LLPanelNearByMedia::handleMediaAutoPlayChanged, this, _2));

    mCommitCallbackRegistrar.add("MediaListCtrl.EnableAll",     boost::bind(&LLPanelNearByMedia::onClickEnableAll, this));
    mCommitCallbackRegistrar.add("MediaListCtrl.DisableAll",        boost::bind(&LLPanelNearByMedia::onClickDisableAll, this));
    mCommitCallbackRegistrar.add("MediaListCtrl.GoMediaPrefs", boost::bind(&LLPanelNearByMedia::onAdvancedButtonClick, this));
    mCommitCallbackRegistrar.add("MediaListCtrl.MoreLess", boost::bind(&LLPanelNearByMedia::onMoreLess, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Stop",      boost::bind(&LLPanelNearByMedia::onClickSelectedMediaStop, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Play",      boost::bind(&LLPanelNearByMedia::onClickSelectedMediaPlay, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Pause",     boost::bind(&LLPanelNearByMedia::onClickSelectedMediaPause, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Mute",      boost::bind(&LLPanelNearByMedia::onClickSelectedMediaMute, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Volume",    boost::bind(&LLPanelNearByMedia::onCommitSelectedMediaVolume, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Zoom",      boost::bind(&LLPanelNearByMedia::onClickSelectedMediaZoom, this));
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Unzoom",    boost::bind(&LLPanelNearByMedia::onClickSelectedMediaUnzoom, this));

    // Context menu handler.
    mCommitCallbackRegistrar.add("SelectedMediaCtrl.Action",
                                 [this](LLUICtrl* ctrl, const LLSD& data)
                                 {
                                     onMenuAction(data);
                                 });
    mEnableCallbackRegistrar.add("SelectedMediaCtrl.Visible",
                                 [this](LLUICtrl* ctrl, const LLSD& data)
                                 {
                                     return onMenuVisible(data);
                                 });

    buildFromFile( "panel_nearby_media.xml");
}

LLPanelNearByMedia::~LLPanelNearByMedia()
{
}

bool LLPanelNearByMedia::postBuild()
{
    LLPanelPulldown::postBuild();

    const S32 RESIZE_BAR_THICKNESS = 6;
    LLResizeBar::Params p;
    p.rect = LLRect(0, RESIZE_BAR_THICKNESS, getRect().getWidth(), 0);
    p.name = "resizebar_bottom";
    p.min_size = getRect().getHeight();
    p.side = LLResizeBar::BOTTOM;
    p.resizing_view = this;
    addChild( LLUICtrlFactory::create<LLResizeBar>(p) );

    p.rect = LLRect( 0, getRect().getHeight(), RESIZE_BAR_THICKNESS, 0);
    p.name = "resizebar_left";
    p.min_size = getRect().getWidth();
    p.side = LLResizeBar::LEFT;
    addChild( LLUICtrlFactory::create<LLResizeBar>(p) );

    LLResizeHandle::Params resize_handle_p;
    resize_handle_p.rect = LLRect( 0, RESIZE_HANDLE_HEIGHT, RESIZE_HANDLE_WIDTH, 0 );
    resize_handle_p.mouse_opaque(false);
    resize_handle_p.min_width(getRect().getWidth());
    resize_handle_p.min_height(getRect().getHeight());
    resize_handle_p.corner(LLResizeHandle::LEFT_BOTTOM);
    addChild(LLUICtrlFactory::create<LLResizeHandle>(resize_handle_p));

    mNearbyMediaPanel = getChild<LLUICtrl>("nearby_media_panel");
    mMediaList = getChild<LLScrollListCtrl>("media_list");
    mEnableAllCtrl = getChild<LLUICtrl>("all_nearby_media_enable_btn");
    mDisableAllCtrl = getChild<LLUICtrl>("all_nearby_media_disable_btn");
    mShowCtrl = getChild<LLComboBox>("show_combo");

    // Dynamic (selection-dependent) controls
    mStopCtrl = getChild<LLUICtrl>("stop");
    mPlayCtrl = getChild<LLUICtrl>("play");
    mPauseCtrl = getChild<LLUICtrl>("pause");
    mMuteCtrl = getChild<LLUICtrl>("mute");
    mVolumeSliderCtrl = getChild<LLUICtrl>("volume_slider_ctrl");
    mZoomCtrl = getChild<LLUICtrl>("zoom");
    mUnzoomCtrl = getChild<LLUICtrl>("unzoom");
    mVolumeSlider = getChild<LLSlider>("volume_slider");
    mMuteBtn = getChild<LLButton>("mute_btn");
    mMoreLessBtn = getChild<LLButton>("more_btn");

    mEmptyNameString = getString("empty_item_text");
    mParcelMediaName = getString("parcel_media_name");
    mParcelAudioName = getString("parcel_audio_name");
    mPlayingString = getString("playing_suffix");

    mMediaList->setDoubleClickCallback(onZoomMedia, this);
    mMediaList->sortByColumnIndex(PROXIMITY_COLUMN, true);
    mMediaList->sortByColumnIndex(VISIBILITY_COLUMN, false);

    refreshList();
    updateControls();
    updateColumns();

    LLView* minimized_controls = getChildView("minimized_controls");
    mMoreRect = getRect();
    mLessRect = getRect();
    mLessRect.mBottom = minimized_controls->getRect().mBottom;

    mMoreLessBtn->setVisible(false);
    onMoreLess();

    mContextMenu = LLUICtrlFactory::getInstance()->createFromFile<LLToggleableMenu>(
        "menu_nearby_media.xml",
        gMenuHolder,
        LLViewerMenuHolderGL::child_registry_t::instance());

    return true;
}

void LLPanelNearByMedia::handleMediaAutoPlayChanged(const LLSD& newvalue)
{
    // update mParcelAudioAutoStartMode if "ParcelMediaAutoPlayEnable" changes
    S32 value = gSavedSettings.getS32("ParcelMediaAutoPlayEnable");
    mParcelAudioAutoStart = value != 0
                            && gSavedSettings.getBOOL("MediaTentativeAutoPlay");

    LLViewerParcelAskPlay *inst = LLViewerParcelAskPlay::getInstance();
    if (value == 2 && !inst->hasData())
    {
        // Init if nessesary
        inst->loadSettings();
    }
    inst->cancelNotification();
}

/*virtual*/
void LLPanelNearByMedia::reshape(S32 width, S32 height, bool called_from_parent)
{
    LLPanelPulldown::reshape(width, height, called_from_parent);

    if (mMoreLessBtn && mMoreLessBtn->getValue().asBoolean())
    {
        mMoreRect = getRect();
    }

}

/*virtual*/
void LLPanelNearByMedia::draw()
{
    // keep bottom of panel on screen
    LLRect screen_rect = calcScreenRect();
    if (screen_rect.mBottom < 0)
    {
        LLRect new_rect = getRect();
        new_rect.mBottom += 0 - screen_rect.mBottom;
        setShape(new_rect);
    }

    refreshList();
    updateControls();

    LLPanelPulldown::draw();
}

/*virtual*/
bool LLPanelNearByMedia::handleHover(S32 x, S32 y, MASK mask)
{
    LLPanelPulldown::handleHover(x, y, mask);

    // If we are hovering over this panel, make sure to clear any hovered media
    // ID.  Note that the more general solution would be to clear this ID when
    // the mouse leaves the in-scene view, but that proved to be problematic.
    // See EXT-5517
    LLViewerMediaFocus::getInstance()->clearHover();

    // Always handle
    return true;
}

bool LLPanelNearByMedia::handleRightMouseDown(S32 x, S32 y, MASK mask)
{
    S32 x_list, y_list;
    localPointToOtherView(x, y, &x_list, &y_list, mMediaList);
    if (mMoreLessBtn->getToggleState()
        && mMediaList->pointInView(x_list, y_list))
    {
        LLScrollListItem* hit_item = mMediaList->hitItem(x_list, y_list);
        bool selected = hit_item && hit_item->getSelected();
        if (!selected)
        {
            selected = mMediaList->selectItemAt(x_list, y_list, mask);
        }

        if (selected && mContextMenu)
        {
            mContextMenu->buildDrawLabels();
            mContextMenu->updateParent(LLMenuGL::sMenuContainer);
            LLMenuGL::showPopup(this, mContextMenu, x, y);
            return true;
        }
    }

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


void LLPanelNearByMedia::onVisibilityChange(bool new_visibility)
{
    if (!new_visibility && mContextMenu->getVisible())
    {
        gMenuHolder->hideMenus();
    }
    LLPanelPulldown::onVisibilityChange(new_visibility);
}

bool LLPanelNearByMedia::getParcelAudioAutoStart()
{
    return mParcelAudioAutoStart;
}

LLScrollListItem* LLPanelNearByMedia::addListItem(const LLUUID &id)
{
    if (NULL == mMediaList) return NULL;

    // Just set up the columns -- the values will be filled in by updateListItem().

    LLSD row;
    row["id"] = id;

    LLSD &columns = row["columns"];

    columns[CHECKBOX_COLUMN]["column"] = "media_checkbox_ctrl";
    columns[CHECKBOX_COLUMN]["type"] = "checkbox";
    //if(mDebugInfoVisible)
    {
    columns[PROXIMITY_COLUMN]["column"] = "media_proximity";
    columns[PROXIMITY_COLUMN]["value"] = "";
        columns[VISIBILITY_COLUMN]["column"] = "media_visibility";
        columns[VISIBILITY_COLUMN]["value"] = "";
        columns[CLASS_COLUMN]["column"] = "media_class";
        columns[CLASS_COLUMN]["type"] = "text";
        columns[CLASS_COLUMN]["value"] = "";
    }
    columns[NAME_COLUMN]["column"] = "media_name";
    columns[NAME_COLUMN]["type"] = "text";
    columns[NAME_COLUMN]["value"] = "";
    //if(mDebugInfoVisible)
    {
        columns[DEBUG_COLUMN]["column"] = "media_debug";
        columns[DEBUG_COLUMN]["type"] = "text";
        columns[DEBUG_COLUMN]["value"] = "";
    }

    LLScrollListItem* new_item = mMediaList->addElement(row);
    if (NULL != new_item)
    {
        LLScrollListCheck* scroll_list_check = dynamic_cast<LLScrollListCheck*>(new_item->getColumn(CHECKBOX_COLUMN));
        if (scroll_list_check)
        {
            LLCheckBoxCtrl *check = scroll_list_check->getCheckBox();
            check->setCommitCallback(boost::bind(&LLPanelNearByMedia::onCheckItem, this, _1, id));
        }
    }
    return new_item;
}

void LLPanelNearByMedia::updateListItem(LLScrollListItem* item, LLViewerMediaImpl* impl)
{
    std::string item_name;
    std::string item_tooltip;
    std::string debug_str;
    LLPanelNearByMedia::MediaClass media_class = MEDIA_CLASS_ALL;

    getNameAndUrlHelper(impl, item_name, item_tooltip, mEmptyNameString);
    // Focused
    if (impl->hasFocus())
    {
        media_class = MEDIA_CLASS_FOCUSED;
    }
    // Is attached to another avatar?
    else if (impl->isAttachedToAnotherAvatar())
    {
        media_class = MEDIA_CLASS_ON_OTHERS;
    }
    // Outside agent parcel
    else if (!impl->isInAgentParcel())
    {
        media_class = MEDIA_CLASS_OUTSIDE_PARCEL;
    }
    else {
        // inside parcel
        media_class = MEDIA_CLASS_WITHIN_PARCEL;
    }

    if(mDebugInfoVisible)
    {
        debug_str += llformat("%g/", (float)impl->getInterest());

        // proximity distance is actually distance squared -- display it as straight distance.
        debug_str += llformat("%g/", (F32) sqrt(impl->getProximityDistance()));

        //          s += llformat("%g/", (float)impl->getCPUUsage());
        //          s += llformat("%g/", (float)impl->getApproximateTextureInterest());
        debug_str += llformat("%g/", (float)(NULL == impl->getSomeObject()) ? 0.0 : impl->getSomeObject()->getPixelArea());

        debug_str += LLPluginClassMedia::priorityToString(impl->getPriority());

        if(impl->hasMedia())
        {
            debug_str += '@';
        }
        else if(impl->isPlayable())
        {
            debug_str += '+';
        }
        else if(impl->isForcedUnloaded())
        {
            debug_str += '!';
        }
    }

    updateListItem(item,
                   item_name,
                   item_tooltip,
                   impl->getProximity(),
                   impl->isMediaDisabled(),
                   impl->hasMedia(),
                   impl->isMediaTimeBased() &&  impl->isMediaPlaying(),
                   media_class,
                   debug_str);
}

void LLPanelNearByMedia::updateListItem(LLScrollListItem* item,
                                          const std::string &item_name,
                                          const std::string &item_tooltip,
                                          S32 proximity,
                                          bool is_disabled,
                                          bool has_media,
                                          bool is_time_based_and_playing,
                                          LLPanelNearByMedia::MediaClass media_class,
                                          const std::string &debug_str)
{
    LLScrollListCell* cell = item->getColumn(PROXIMITY_COLUMN);
    if(cell)
    {
        // since we are forced to sort by text, encode sort order as string
        std::string proximity_string = STRINGIZE(proximity);
        std::string old_proximity_string = cell->getValue().asString();
        if(proximity_string != old_proximity_string)
        {
            cell->setValue(proximity_string);
            mMediaList->setNeedsSort(true);
        }
    }

    cell = item->getColumn(CHECKBOX_COLUMN);
    if(cell)
    {
        cell->setValue(!is_disabled);
    }

    cell = item->getColumn(VISIBILITY_COLUMN);
    if(cell)
    {
        S32 old_visibility = cell->getValue();
        // *HACK ALERT: force ordering of Media before Audio before the rest of the list
        S32 new_visibility =
            item->getUUID() == PARCEL_MEDIA_LIST_ITEM_UUID ? 3
            : item->getUUID() == PARCEL_AUDIO_LIST_ITEM_UUID ? 2
            : (has_media) ? 1
            : ((is_disabled) ? 0
            : -1);
        cell->setValue(STRINGIZE(new_visibility));
        if (new_visibility != old_visibility)
        {
            mMediaList->setNeedsSort(true);
        }
    }

    cell = item->getColumn(NAME_COLUMN);
    if(cell)
    {
        std::string name = item_name;
        std::string old_name = cell->getValue().asString();
        if (has_media)
        {
            name += " " + mPlayingString;
        }
        if (name != old_name)
        {
            cell->setValue(name);
        }
        cell->setToolTip(item_tooltip);

        // *TODO: Make these font styles/colors configurable via XUI
        U8 font_style = LLFontGL::NORMAL;
        LLColor4 cell_color = LLColor4::white;

        // Only colorize by class in debug
        if (mDebugInfoVisible)
        {
            switch (media_class) {
                case MEDIA_CLASS_FOCUSED:
                    cell_color = LLColor4::yellow;
                    break;
                case MEDIA_CLASS_ON_OTHERS:
                    cell_color = LLColor4::red;
                    break;
                case MEDIA_CLASS_OUTSIDE_PARCEL:
                    cell_color = LLColor4::orange;
                    break;
                case MEDIA_CLASS_WITHIN_PARCEL:
                default:
                    break;
            }
        }
        if (is_disabled)
        {
            if (mDebugInfoVisible)
            {
                font_style |= LLFontGL::ITALIC;
                cell_color = LLColor4::black;
            }
            else {
                // Dim it if it is disabled
                cell_color.setAlpha(0.25);
            }
        }
        // Dim it if it isn't "showing"
        else if (!has_media)
        {
            cell_color.setAlpha(0.25);
        }
        // Bold it if it is time-based media and it is playing
        else if (is_time_based_and_playing)
        {
            if (mDebugInfoVisible) font_style |= LLFontGL::BOLD;
        }
        cell->setColor(cell_color);
        LLScrollListText *text_cell = dynamic_cast<LLScrollListText*> (cell);
        if (text_cell)
        {
            text_cell->setFontStyle(font_style);
        }
    }

    cell = item->getColumn(CLASS_COLUMN);
    if(cell)
    {
        // TODO: clean this up!
        cell->setValue(STRINGIZE(media_class));
    }

    if(mDebugInfoVisible)
    {
        cell = item->getColumn(DEBUG_COLUMN);
        if(cell)
        {
            cell->setValue(debug_str);
        }
    }
}

void LLPanelNearByMedia::removeListItem(const LLUUID &id)
{
    if (NULL == mMediaList) return;

    mMediaList->deleteSingleItem(mMediaList->getItemIndex(id));
    mMediaList->updateLayout();
}

void LLPanelNearByMedia::refreshParcelItems()
{
    //
    // First add/remove the "fake" items Parcel Media and Parcel Audio.
    // These items will have special UUIDs
    //    PARCEL_MEDIA_LIST_ITEM_UUID
    //    PARCEL_AUDIO_LIST_ITEM_UUID
    //
    // Get the filter choice.
    const LLSD &choice_llsd = mShowCtrl->getSelectedValue();
    MediaClass choice = (MediaClass)choice_llsd.asInteger();
    // Only show "special parcel items" if "All" or "Within" filter
    // (and if media is "enabled")
    bool should_include = (choice == MEDIA_CLASS_ALL || choice == MEDIA_CLASS_WITHIN_PARCEL);
    LLViewerMedia* media_inst = LLViewerMedia::getInstance();

    // First Parcel Media: add or remove it as necessary
    if (gSavedSettings.getBOOL("AudioStreamingMedia") && should_include && media_inst->hasParcelMedia())
    {
        // Yes, there is parcel media.
        if (NULL == mParcelMediaItem)
        {
            mParcelMediaItem = addListItem(PARCEL_MEDIA_LIST_ITEM_UUID);
            mMediaList->setNeedsSort(true);
        }
    }
    else {
        if (NULL != mParcelMediaItem) {
            removeListItem(PARCEL_MEDIA_LIST_ITEM_UUID);
            mParcelMediaItem = NULL;
            mMediaList->setNeedsSort(true);
        }
    }

    // ... then update it
    if (NULL != mParcelMediaItem)
    {
        std::string name, url, tooltip;
        getNameAndUrlHelper(LLViewerParcelMedia::getInstance()->getParcelMedia(), name, url, "");
        if (name.empty() || name == url)
        {
            tooltip = url;
        }
        else
        {
            tooltip = name + " : " + url;
        }
        LLViewerMediaImpl *impl = LLViewerParcelMedia::getInstance()->getParcelMedia();
        updateListItem(mParcelMediaItem,
                       mParcelMediaName,
                       tooltip,
                       -2, // Proximity closer than anything else, before Parcel Audio
                       impl == NULL || impl->isMediaDisabled(),
                       impl != NULL && !LLViewerParcelMedia::getInstance()->getURL().empty(),
                       impl != NULL && impl->isMediaTimeBased() &&  impl->isMediaPlaying(),
                       MEDIA_CLASS_ALL,
                       "parcel media");
    }

    // Next Parcel Audio: add or remove it as necessary (don't show if disabled in prefs)
    if (should_include && media_inst->hasParcelAudio() && gSavedSettings.getBOOL("AudioStreamingMusic"))
    {
        // Yes, there is parcel audio.
        if (NULL == mParcelAudioItem)
        {
            mParcelAudioItem = addListItem(PARCEL_AUDIO_LIST_ITEM_UUID);
            mMediaList->setNeedsSort(true);
        }
    }
    else {
        if (NULL != mParcelAudioItem) {
            removeListItem(PARCEL_AUDIO_LIST_ITEM_UUID);
            mParcelAudioItem = NULL;
            mMediaList->setNeedsSort(true);
        }
    }

    // ... then update it
    if (NULL != mParcelAudioItem)
    {
        bool is_playing = media_inst->isParcelAudioPlaying();

        std::string url;
        url = media_inst->getParcelAudioURL();

        updateListItem(mParcelAudioItem,
                       mParcelAudioName,
                       url,
                       -1, // Proximity after Parcel Media, but closer than anything else
                       (!is_playing),
                       is_playing,
                       is_playing,
                       MEDIA_CLASS_ALL,
                       "parcel audio");
    }
}

void LLPanelNearByMedia::refreshList()
{
    bool all_items_deleted = false;

    if(!mMediaList)
    {
        // None of this makes any sense if the media list isn't there.
        return;
    }

    // Check whether the debug column has been shown/hidden.
    bool debug_info_visible = gSavedSettings.getBOOL("MediaPerformanceManagerDebug");
    if(debug_info_visible != mDebugInfoVisible)
    {
        mDebugInfoVisible = debug_info_visible;

        // Clear all items so the list gets regenerated.
        mMediaList->deleteAllItems();
        mParcelAudioItem = NULL;
        mParcelMediaItem = NULL;
        all_items_deleted = true;

        updateColumns();
    }

    refreshParcelItems();

    // Get the canonical list from LLViewerMedia
    LLViewerMedia* media_inst = LLViewerMedia::getInstance();
    LLViewerMedia::impl_list impls = media_inst->getPriorityList();
    LLViewerMedia::impl_list::iterator priority_iter;

    U32 disabled_count = 0;

    // iterate over the impl list, creating rows as necessary.
    for(priority_iter = impls.begin(); priority_iter != impls.end(); priority_iter++)
    {
        LLViewerMediaImpl *impl = *priority_iter;

        // If we just emptied out the list, every flag needs to be reset.
        if(all_items_deleted)
        {
            impl->setInNearbyMediaList(false);
        }

        if (!impl->isParcelMedia())
        {
            LLUUID media_id = impl->getMediaTextureID();
            S32 proximity = impl->getProximity();
            // This is expensive (i.e. a linear search) -- don't use it here.  We now use mInNearbyMediaList instead.
            //S32 index = mMediaList->getItemIndex(media_id);
            if (proximity < 0 || !shouldShow(impl))
            {
                if (impl->getInNearbyMediaList())
                {
                    // There's a row for this impl -- remove it.
                    removeListItem(media_id);
                    impl->setInNearbyMediaList(false);
                }
            }
            else
            {
                if (!impl->getInNearbyMediaList())
                {
                    // We don't have a row for this impl -- add one.
                    addListItem(media_id);
                    impl->setInNearbyMediaList(true);
                }
            }
            // Update counts
            if (impl->isMediaDisabled())
            {
                disabled_count++;
            }
        }
    }
    mDisableAllCtrl->setEnabled((gSavedSettings.getBOOL("AudioStreamingMusic") ||
                                 gSavedSettings.getBOOL("AudioStreamingMedia")) &&
                                (media_inst->isAnyMediaShowing() ||
                                 media_inst->isParcelMediaPlaying() ||
                                 media_inst->isParcelAudioPlaying()));

    mEnableAllCtrl->setEnabled( (gSavedSettings.getBOOL("AudioStreamingMusic") ||
                                gSavedSettings.getBOOL("AudioStreamingMedia")) &&
                               (disabled_count > 0 ||
                                // parcel media (if we have it, and it isn't playing, enable "start")
                                (media_inst->hasParcelMedia() && ! media_inst->isParcelMediaPlaying()) ||
                                // parcel audio (if we have it, and it isn't playing, enable "start")
                                (media_inst->hasParcelAudio() && ! media_inst->isParcelAudioPlaying())));

    // Iterate over the rows in the control, updating ones whose impl exists, and deleting ones whose impl has gone away.
    std::vector<LLScrollListItem*> items = mMediaList->getAllData();

    for (std::vector<LLScrollListItem*>::iterator item_it = items.begin();
        item_it != items.end();
        ++item_it)
    {
        LLScrollListItem* item = (*item_it);
        LLUUID row_id = item->getUUID();

        if (row_id != PARCEL_MEDIA_LIST_ITEM_UUID &&
            row_id != PARCEL_AUDIO_LIST_ITEM_UUID)
        {
            LLViewerMediaImpl* impl = media_inst->getMediaImplFromTextureID(row_id);
            if(impl)
            {
                updateListItem(item, impl);
            }
            else
            {
                // This item's impl has been deleted -- remove the row.
                // Removing the row won't throw off our iteration, since we have a local copy of the array.
                // We just need to make sure we don't access this item after the delete.
                removeListItem(row_id);
            }
        }
    }

    // Set the selection to whatever media impl the media focus/hover is on.
    // This is an experiment, and can be removed by ifdefing out these 4 lines.
    LLUUID media_target = LLViewerMediaFocus::getInstance()->getControlsMediaID();
    if(media_target.notNull())
    {
        mMediaList->selectByID(media_target);
    }
}

void LLPanelNearByMedia::updateColumns()
{
    if (!mDebugInfoVisible)
    {
        if (mMediaList->getColumn(CHECKBOX_COLUMN)) mMediaList->getColumn(VISIBILITY_COLUMN)->setWidth(-1);
        if (mMediaList->getColumn(VISIBILITY_COLUMN)) mMediaList->getColumn(VISIBILITY_COLUMN)->setWidth(-1);
        if (mMediaList->getColumn(PROXIMITY_COLUMN)) mMediaList->getColumn(PROXIMITY_COLUMN)->setWidth(-1);
        if (mMediaList->getColumn(CLASS_COLUMN)) mMediaList->getColumn(CLASS_COLUMN)->setWidth(-1);
        if (mMediaList->getColumn(DEBUG_COLUMN)) mMediaList->getColumn(DEBUG_COLUMN)->setWidth(-1);
    }
    else {
        if (mMediaList->getColumn(CHECKBOX_COLUMN)) mMediaList->getColumn(VISIBILITY_COLUMN)->setWidth(20);
        if (mMediaList->getColumn(VISIBILITY_COLUMN)) mMediaList->getColumn(VISIBILITY_COLUMN)->setWidth(20);
        if (mMediaList->getColumn(PROXIMITY_COLUMN)) mMediaList->getColumn(PROXIMITY_COLUMN)->setWidth(30);
        if (mMediaList->getColumn(CLASS_COLUMN)) mMediaList->getColumn(CLASS_COLUMN)->setWidth(20);
        if (mMediaList->getColumn(DEBUG_COLUMN)) mMediaList->getColumn(DEBUG_COLUMN)->setWidth(200);
    }
}

void LLPanelNearByMedia::onClickEnableAll()
{
    LLViewerMedia::getInstance()->setAllMediaEnabled(true);
}

void LLPanelNearByMedia::onClickDisableAll()
{
    LLViewerMedia::getInstance()->setAllMediaEnabled(false);
}

void LLPanelNearByMedia::onClickEnableParcelMedia()
{
    if ( ! LLViewerMedia::getInstance()->isParcelMediaPlaying() )
    {
        LLViewerParcelMedia::getInstance()->play(LLViewerParcelMgr::getInstance()->getAgentParcel());
    }
}

void LLPanelNearByMedia::onClickDisableParcelMedia()
{
    // This actually unloads the impl, as opposed to "stop"ping the media
    LLViewerParcelMedia::getInstance()->stop();
}

void LLPanelNearByMedia::onCheckItem(LLUICtrl* ctrl, const LLUUID &row_id)
{
    LLCheckBoxCtrl* check = static_cast<LLCheckBoxCtrl*>(ctrl);

    setDisabled(row_id, ! check->getValue());
}

bool LLPanelNearByMedia::setDisabled(const LLUUID &row_id, bool disabled)
{
    if (row_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        if (disabled)
        {
            onClickParcelAudioStop();
        }
        else
        {
            onClickParcelAudioPlay();
        }
        return true;
    }
    else if (row_id == PARCEL_MEDIA_LIST_ITEM_UUID)
    {
        if (disabled)
        {
            onClickDisableParcelMedia();
        }
        else
        {
            onClickEnableParcelMedia();
        }
        return true;
    }
    else {
        LLViewerMediaImpl* impl = LLViewerMedia::getInstance()->getMediaImplFromTextureID(row_id);
        if(impl)
        {
            impl->setDisabled(disabled, true);
            return true;
        }
    }
    return false;
}

//static
void LLPanelNearByMedia::onZoomMedia(void* user_data)
{
    LLPanelNearByMedia* panelp = (LLPanelNearByMedia*)user_data;
    LLUUID media_id = panelp->mMediaList->getValue().asUUID();

    LLViewerMediaFocus::getInstance()->focusZoomOnMedia(media_id);
}

void LLPanelNearByMedia::onClickParcelMediaPlay()
{
    LLViewerParcelMedia::getInstance()->play(LLViewerParcelMgr::getInstance()->getAgentParcel());
}

void LLPanelNearByMedia::onClickParcelMediaStop()
{
    if (LLViewerParcelMedia::getInstance()->getParcelMedia())
    {
        // This stops the media playing, as opposed to unloading it like
        // LLViewerParcelMedia::stop() does
        LLViewerParcelMedia::getInstance()->getParcelMedia()->stop();
    }
}

void LLPanelNearByMedia::onClickParcelMediaPause()
{
    LLViewerParcelMedia::getInstance()->pause();
}

void LLPanelNearByMedia::onClickParcelAudioPlay()
{
    // User *explicitly* started the internet stream, so keep the stream
    // playing and updated as they cross to other parcels etc.
    mParcelAudioAutoStart = true;
    if (!gAudiop)
    {
        LL_WARNS("AudioEngine") << "LLAudioEngine instance doesn't exist!" << LL_ENDL;
        return;
    }

    if (LLAudioEngine::AUDIO_PAUSED == gAudiop->isInternetStreamPlaying())
    {
        // 'false' means unpause
        gAudiop->pauseInternetStream(false);
    }
    else
    {
        LLViewerAudio::getInstance()->startInternetStreamWithAutoFade(LLViewerMedia::getInstance()->getParcelAudioURL());
    }
}

void LLPanelNearByMedia::onClickParcelAudioStop()
{
    // User *explicitly* stopped the internet stream, so don't
    // re-start audio when i.e. they move to another parcel, until
    // they explicitly start it again.
    mParcelAudioAutoStart = false;
    if (!gAudiop)
    {
        LL_WARNS("AudioEngine") << "LLAudioEngine instance doesn't exist!" << LL_ENDL;
        return;
    }

    LLViewerAudio::getInstance()->stopInternetStreamWithAutoFade();
}

void LLPanelNearByMedia::onClickParcelAudioPause()
{
    if (!gAudiop)
    {
        LL_WARNS("AudioEngine") << "LLAudioEngine instance doesn't exist!" << LL_ENDL;
        return;
    }

    // 'true' means pause
    gAudiop->pauseInternetStream(true);
}

bool LLPanelNearByMedia::shouldShow(LLViewerMediaImpl* impl)
{
    const LLSD &choice_llsd = mShowCtrl->getSelectedValue();
    MediaClass choice = (MediaClass)choice_llsd.asInteger();

    switch (choice)
    {
        case MEDIA_CLASS_ALL:
            return true;
            break;
        case MEDIA_CLASS_WITHIN_PARCEL:
            return impl->isInAgentParcel();
            break;
        case MEDIA_CLASS_OUTSIDE_PARCEL:
            return ! impl->isInAgentParcel();
            break;
        case MEDIA_CLASS_ON_OTHERS:
            return impl->isAttachedToAnotherAvatar();
            break;
        default:
            break;
    }
    return true;
}

void LLPanelNearByMedia::onAdvancedButtonClick()
{
    // bring up the prefs floater
    LLFloaterPreference* prefsfloater = dynamic_cast<LLFloaterPreference*>(LLFloaterReg::showInstance("preferences"));
    if (prefsfloater)
    {
        // grab the 'audio' panel from the preferences floater and
        // bring it the front!
        LLTabContainer* tabcontainer = prefsfloater->getChild<LLTabContainer>("pref core");
        LLPanel* audiopanel = prefsfloater->getChild<LLPanel>("audio");
        if (tabcontainer && audiopanel)
        {
            tabcontainer->selectTabPanel(audiopanel);
        }
    }
}

void LLPanelNearByMedia::onMoreLess()
{
    bool is_more = mMoreLessBtn->getToggleState();
    mNearbyMediaPanel->setVisible(is_more);

    // enable resizing when expanded
    getChildView("resizebar_bottom")->setEnabled(is_more);

    LLRect new_rect = is_more ? mMoreRect : mLessRect;
    new_rect.translate(getRect().mRight - new_rect.mRight, getRect().mTop - new_rect.mTop);

    setShape(new_rect);

    mMoreLessBtn->setVisible(true);
}

void LLPanelNearByMedia::updateControls()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    LLViewerMedia* media_inst = LLViewerMedia::getInstance();

    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        if (!media_inst->getInstance()->hasParcelAudio() || !gSavedSettings.getBOOL("AudioStreamingMusic"))
        {
            // disable controls if audio streaming music is disabled from preference
            showDisabledControls();
        }
        else {
            showTimeBasedControls(media_inst->isParcelAudioPlaying(),
                              false, // include_zoom
                              false, // is_zoomed
                              gSavedSettings.getBOOL("MuteMusic"),
                              gSavedSettings.getF32("AudioLevelMusic") );
        }
    }
    else if (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID)
    {
        if (!media_inst->hasParcelMedia() || !gSavedSettings.getBOOL("AudioStreamingMedia"))
        {
            // disable controls if audio streaming media is disabled from preference
            showDisabledControls();
        }
        else {
            LLViewerMediaImpl* impl = LLViewerParcelMedia::getInstance()->getParcelMedia();
            if (NULL == impl)
            {
                // Just means it hasn't started yet
                showBasicControls(false, false, false, false, 0);
            }
            else if (impl->isMediaTimeBased())
            {
                showTimeBasedControls(impl->isMediaPlaying(),
                                      false, // include_zoom
                                      false, // is_zoomed
                                      impl->getVolume() == 0.0,
                                      impl->getVolume() );
            }
            else {
                // non-time-based parcel media
                showBasicControls(media_inst->isParcelMediaPlaying(),
                                  false,
                                  false,
                                  impl->getVolume() == 0.0,
                                  impl->getVolume());
            }
        }
    }
    else {
        LLViewerMediaImpl* impl = media_inst->getMediaImplFromTextureID(selected_media_id);

        if (NULL == impl || !gSavedSettings.getBOOL("AudioStreamingMedia"))
        {
            showDisabledControls();
        }
        else {
            if (impl->isMediaTimeBased())
            {
                showTimeBasedControls(impl->isMediaPlaying(),
                                      ! impl->isParcelMedia(),  // include_zoom
                                      LLViewerMediaFocus::getInstance()->isZoomed(),
                                      impl->getVolume() == 0.0,
                                      impl->getVolume());
            }
            else {
                showBasicControls(!impl->isMediaDisabled(),
                                  ! impl->isParcelMedia(),  // include_zoom
                                  LLViewerMediaFocus::getInstance()->isZoomedOnMedia(impl->getMediaTextureID()),
                                  impl->getVolume() == 0.0,
                                  impl->getVolume());
            }
        }
    }
}

void LLPanelNearByMedia::showBasicControls(bool playing, bool include_zoom, bool is_zoomed, bool muted, F32 volume)
{
    mStopCtrl->setVisible(playing);
    mPlayCtrl->setVisible(!playing);
    mPauseCtrl->setVisible(false);
    mVolumeSliderCtrl->setVisible(true);
    mMuteCtrl->setVisible(true);
    mMuteBtn->setValue(muted);
    mVolumeSlider->setValue(volume);
    mZoomCtrl->setVisible(include_zoom && !is_zoomed);
    mUnzoomCtrl->setVisible(include_zoom && is_zoomed);
    mStopCtrl->setEnabled(true);
    mZoomCtrl->setEnabled(true);
}

void LLPanelNearByMedia::showTimeBasedControls(bool playing, bool include_zoom, bool is_zoomed, bool muted, F32 volume)
{
    mStopCtrl->setVisible(true);
    mPlayCtrl->setVisible(!playing);
    mPauseCtrl->setVisible(playing);
    mMuteCtrl->setVisible(true);
    mVolumeSliderCtrl->setVisible(true);
    mZoomCtrl->setVisible(include_zoom);
    mZoomCtrl->setVisible(include_zoom && !is_zoomed);
    mUnzoomCtrl->setVisible(include_zoom && is_zoomed);
    mStopCtrl->setEnabled(true);
    mZoomCtrl->setEnabled(true);
    mMuteBtn->setValue(muted);
    mVolumeSlider->setValue(volume);
}

void LLPanelNearByMedia::showDisabledControls()
{
    mStopCtrl->setVisible(true);
    mPlayCtrl->setVisible(false);
    mPauseCtrl->setVisible(false);
    mMuteCtrl->setVisible(false);
    mVolumeSliderCtrl->setVisible(false);
    mZoomCtrl->setVisible(true);
    mUnzoomCtrl->setVisible(false);
    mStopCtrl->setEnabled(false);
    mZoomCtrl->setEnabled(false);
}

void LLPanelNearByMedia::onClickSelectedMediaStop()
{
    setDisabled(mMediaList->getValue().asUUID(), true);
}

void LLPanelNearByMedia::onClickSelectedMediaPlay()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();

    // First enable it
    setDisabled(selected_media_id, false);

    // Special code to make play "unpause" if time-based and playing
    if (selected_media_id != PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        LLViewerMediaImpl *impl = (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID) ?
            ((LLViewerMediaImpl*)LLViewerParcelMedia::getInstance()->getParcelMedia()) : LLViewerMedia::getInstance()->getMediaImplFromTextureID(selected_media_id);
        if (NULL != impl)
        {
            if (impl->isMediaTimeBased() && impl->isMediaPaused())
            {
                // Aha!  It's really time-based media that's paused, so unpause
                impl->play();
                return;
            }
            else if (impl->isParcelMedia())
            {
                LLViewerParcelMedia::getInstance()->play(LLViewerParcelMgr::getInstance()->getAgentParcel());
            }
        }
    }
}

void LLPanelNearByMedia::onClickSelectedMediaPause()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        onClickParcelAudioPause();
    }
    else if (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID)
    {
        onClickParcelMediaPause();
    }
    else {
        LLViewerMediaImpl* impl = LLViewerMedia::getInstance()->getMediaImplFromTextureID(selected_media_id);
        if (NULL != impl && impl->isMediaTimeBased() && impl->isMediaPlaying())
        {
            impl->pause();
        }
    }
}

void LLPanelNearByMedia::onClickSelectedMediaMute()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        gSavedSettings.setBOOL("MuteMusic", mMuteBtn->getValue());
    }
    else {
        LLViewerMediaImpl* impl = (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID) ?
            ((LLViewerMediaImpl*)LLViewerParcelMedia::getInstance()->getParcelMedia()) : LLViewerMedia::getInstance()->getMediaImplFromTextureID(selected_media_id);
        if (NULL != impl)
        {
            F32 volume = impl->getVolume();
            if(volume > 0.0)
            {
                impl->setMute(true);
            }
            else if (mVolumeSlider->getValueF32() == 0.0)
            {
                impl->setMute(false);
                mVolumeSlider->setValue(impl->getVolume());
            }
            else
            {
                impl->setVolume(mVolumeSlider->getValueF32());
            }
        }
    }
}

void LLPanelNearByMedia::onCommitSelectedMediaVolume()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        F32 vol = mVolumeSlider->getValueF32();
        gSavedSettings.setF32("AudioLevelMusic", vol);
    }
    else {
        LLViewerMediaImpl* impl = (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID) ?
            ((LLViewerMediaImpl*)LLViewerParcelMedia::getInstance()->getParcelMedia()) : LLViewerMedia::getInstance()->getMediaImplFromTextureID(selected_media_id);
        if (NULL != impl)
        {
            impl->setVolume(mVolumeSlider->getValueF32());
        }
    }
}

void LLPanelNearByMedia::onClickSelectedMediaZoom()
{
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID || selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID)
        return;
    LLViewerMediaFocus::getInstance()->focusZoomOnMedia(selected_media_id);
}

void LLPanelNearByMedia::onClickSelectedMediaUnzoom()
{
    LLViewerMediaFocus::getInstance()->unZoom();
}

void LLPanelNearByMedia::onMenuAction(const LLSD& userdata)
{
    const std::string command_name = userdata.asString();
    if ("copy_url" == command_name)
    {
        LLClipboard::instance().reset();
        std::string url = getSelectedUrl();

        if (!url.empty())
        {
            LLClipboard::instance().copyToClipboard(utf8str_to_wstring(url), 0, url.size());
        }
    }
    else if ("copy_data" == command_name)
    {
        LLClipboard::instance().reset();
        std::string url = getSelectedUrl();
        static const std::string encoding_specifier = "base64,";
        size_t pos = url.find(encoding_specifier);
        if (pos != std::string::npos)
        {
            pos += encoding_specifier.size();
            std::string res = LLBase64::decodeAsString(url.substr(pos));
            LLClipboard::instance().copyToClipboard(utf8str_to_wstring(res), 0, res.size());
        }
        else
        {
            url = LLURI::unescape(url);
            LLClipboard::instance().copyToClipboard(utf8str_to_wstring(url), 0, url.size());
        }
    }
}

bool LLPanelNearByMedia::onMenuVisible(const LLSD& userdata)
{
    const std::string command_name = userdata.asString();
    if ("copy_data" == command_name)
    {
        std::string url = getSelectedUrl();
        if (url.rfind("data:", 0) == 0)
        {
            // might be a a good idea to permit text/html only
            return true;
        }
    }
    return false;
}

// static
void LLPanelNearByMedia::getNameAndUrlHelper(LLViewerMediaImpl* impl, std::string& name, std::string & url, const std::string &defaultName)
{
    if (NULL == impl) return;

    name = impl->getName();
    url = impl->getCurrentMediaURL();   // This is the URL the media impl actually has loaded
    if (url.empty())
    {
        url = impl->getMediaEntryURL(); // This is the current URL from the media data
    }
    if (url.empty())
    {
        url = impl->getHomeURL();       // This is the home URL from the media data
    }
    if (name.empty())
    {
        name = url;
    }
    if (name.empty())
    {
        name = defaultName;
    }
}

std::string LLPanelNearByMedia::getSelectedUrl()
{
    std::string url;
    LLUUID selected_media_id = mMediaList->getValue().asUUID();
    if (selected_media_id == PARCEL_AUDIO_LIST_ITEM_UUID)
    {
        url = LLViewerMedia::getInstance()->getParcelAudioURL();
    }
    else if (selected_media_id == PARCEL_MEDIA_LIST_ITEM_UUID)
    {
        url = LLViewerParcelMedia::getInstance()->getURL();
    }
    else
    {
        LLViewerMediaImpl* impl = LLViewerMedia::getInstance()->getMediaImplFromTextureID(selected_media_id);
        if (NULL != impl)
        {
            std::string name;
            getNameAndUrlHelper(impl, name, url, mEmptyNameString);
        }
    }
    return url;
}