/** 
 * @file llpanelpeople.cpp
 * @brief Side tray "People" panel
 *
 * $LicenseInfo:firstyear=2009&license=viewergpl$
 * 
 * Copyright (c) 2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

// libs
#include "llfloaterreg.h"
#include "llmenugl.h"
#include "llfiltereditor.h"
#include "lltabcontainer.h"
#include "lluictrlfactory.h"

#include "llpanelpeople.h"

// newview
#include "llaccordionctrl.h"
#include "llaccordionctrltab.h"
#include "llagent.h"
#include "llavataractions.h"
#include "llavatarlist.h"
#include "llavatarlistitem.h"
#include "llcallingcard.h"			// for LLAvatarTracker
#include "llfloateravatarpicker.h"
//#include "llfloaterminiinspector.h"
#include "llfriendcard.h"
#include "llgroupactions.h"
#include "llgrouplist.h"
#include "llpanelpeoplemenus.h"
#include "llrecentpeople.h"
#include "llviewercontrol.h"		// for gSavedSettings
#include "llviewermenu.h"			// for gMenuHolder
#include "llvoiceclient.h"
#include "llworld.h"

#define FRIEND_LIST_UPDATE_TIMEOUT	0.5
#define NEARBY_LIST_UPDATE_INTERVAL 1

static const std::string NEARBY_TAB_NAME	= "nearby_panel";
static const std::string FRIENDS_TAB_NAME	= "friends_panel";
static const std::string GROUP_TAB_NAME		= "groups_panel";
static const std::string RECENT_TAB_NAME	= "recent_panel";

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

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

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

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

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

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

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

			return name1 < name2;
		}
		
		return online1 > online2; 
	}
};

static const LLAvatarItemRecentComparator RECENT_COMPARATOR;
static const LLAvatarItemStatusComparator STATUS_COMPARATOR;

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

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

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

	virtual ~Updater()
	{
	}

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

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

	callback_t		mCallback;
};

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

	virtual BOOL tick() // from LLEventTimer
	{
		return FALSE;
	}
};

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

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

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

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

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

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


	/*virtual*/ BOOL tick()
	{
		if (mMask & (LLFriendObserver::ADD | LLFriendObserver::REMOVE | LLFriendObserver::ONLINE))
			updateList();

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

		return FALSE;
	}

private:
	U32 mMask;
	LLInventoryFriendCardObserver* mInvObserver;

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

		friend class LLFriendListUpdater;

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

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

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

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

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

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

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

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

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

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

	/*virtual*/ BOOL tick()
	{
		updateList();
		return FALSE;
	}
private:
};

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

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

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

LLPanelPeople::LLPanelPeople()
	:	LLPanel(),
		mFilterSubString(LLStringUtil::null),
		mFilterEditor(NULL),
		mTabContainer(NULL),
		mOnlineFriendList(NULL),
		mAllFriendList(NULL),
		mNearbyList(NULL),
		mRecentList(NULL),
		mGroupList(NULL)
{
	mFriendListUpdater = new LLFriendListUpdater(boost::bind(&LLPanelPeople::updateFriendList,	this));
	mNearbyListUpdater = new LLNearbyListUpdater(boost::bind(&LLPanelPeople::updateNearbyList,	this));
	mRecentListUpdater = new LLRecentListUpdater(boost::bind(&LLPanelPeople::updateRecentList,	this));
}

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

	LLView::deleteViewByHandle(mGroupPlusMenuHandle);
	LLView::deleteViewByHandle(mNearbyViewSortMenuHandle);
	LLView::deleteViewByHandle(mFriendsViewSortMenuHandle);
	LLView::deleteViewByHandle(mGroupsViewSortMenuHandle);
	LLView::deleteViewByHandle(mRecentViewSortMenuHandle);

}

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

	bool expanded = param.asBoolean();

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

BOOL LLPanelPeople::postBuild()
{
	mVisibleSignal.connect(boost::bind(&LLPanelPeople::onVisibilityChange, this, _2));
	
	mFilterEditor = getChild<LLFilterEditor>("filter_input");
	mFilterEditor->setCommitCallback(boost::bind(&LLPanelPeople::onFilterEdit, this, _2));

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

	mOnlineFriendList = getChild<LLPanel>(FRIENDS_TAB_NAME)->getChild<LLAvatarList>("avatars_online");
	mAllFriendList = getChild<LLPanel>(FRIENDS_TAB_NAME)->getChild<LLAvatarList>("avatars_all");
	mOnlineFriendList->setNoItemsCommentText(getString("no_friends_online"));
	mOnlineFriendList->setShowIcons("FriendsListShowIcons");
	mAllFriendList->setNoItemsCommentText(getString("no_friends"));
	mAllFriendList->setShowIcons("FriendsListShowIcons");

	mNearbyList = getChild<LLPanel>(NEARBY_TAB_NAME)->getChild<LLAvatarList>("avatar_list");
	mNearbyList->setNoItemsCommentText(getString("no_one_near"));
	mNearbyList->setShowIcons("NearbyListShowIcons");

	mRecentList = getChild<LLPanel>(RECENT_TAB_NAME)->getChild<LLAvatarList>("avatar_list");
	mRecentList->setNoItemsCommentText(getString("no_people"));
	mRecentList->setShowIcons("RecentListShowIcons");

	mGroupList = getChild<LLGroupList>("group_list");
	mGroupList->setNoItemsCommentText(getString("no_groups"));

	mNearbyList->setContextMenu(&LLPanelPeopleMenus::gNearbyMenu);
	mRecentList->setContextMenu(&LLPanelPeopleMenus::gNearbyMenu);

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

	LLPanel* groups_panel = getChild<LLPanel>(GROUP_TAB_NAME);
	groups_panel->childSetAction("activate_btn", boost::bind(&LLPanelPeople::onActivateButtonClicked,	this));
	groups_panel->childSetAction("plus_btn",	boost::bind(&LLPanelPeople::onGroupPlusButtonClicked,	this));
	groups_panel->childSetAction("minus_btn",	boost::bind(&LLPanelPeople::onGroupMinusButtonClicked,	this));

	LLPanel* friends_panel = getChild<LLPanel>(FRIENDS_TAB_NAME);
	friends_panel->childSetAction("add_btn",	boost::bind(&LLPanelPeople::onAddFriendWizButtonClicked,	this));
	friends_panel->childSetAction("del_btn",	boost::bind(&LLPanelPeople::onDeleteFriendButtonClicked,	this));

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

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

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

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

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

	buttonSetAction("view_profile_btn",	boost::bind(&LLPanelPeople::onViewProfileButtonClicked,	this));
	buttonSetAction("add_friend_btn",	boost::bind(&LLPanelPeople::onAddFriendButtonClicked,	this));
	buttonSetAction("group_info_btn",	boost::bind(&LLPanelPeople::onGroupInfoButtonClicked,	this));
	buttonSetAction("chat_btn",			boost::bind(&LLPanelPeople::onChatButtonClicked,		this));
	buttonSetAction("im_btn",			boost::bind(&LLPanelPeople::onImButtonClicked,			this));
	buttonSetAction("call_btn",			boost::bind(&LLPanelPeople::onCallButtonClicked,		this));
	buttonSetAction("teleport_btn",		boost::bind(&LLPanelPeople::onTeleportButtonClicked,	this));
	buttonSetAction("share_btn",		boost::bind(&LLPanelPeople::onShareButtonClicked,		this));

	getChild<LLPanel>(NEARBY_TAB_NAME)->childSetAction("nearby_view_sort_btn",boost::bind(&LLPanelPeople::onNearbyViewSortButtonClicked,		this));
	getChild<LLPanel>(RECENT_TAB_NAME)->childSetAction("recent_viewsort_btn",boost::bind(&LLPanelPeople::onRecentViewSortButtonClicked,			this));
	getChild<LLPanel>(FRIENDS_TAB_NAME)->childSetAction("friends_viewsort_btn",boost::bind(&LLPanelPeople::onFriendsViewSortButtonClicked,		this));
	getChild<LLPanel>(GROUP_TAB_NAME)->childSetAction("groups_viewsort_btn",boost::bind(&LLPanelPeople::onGroupsViewSortButtonClicked,		this));

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

	// Create menus.
	LLUICtrl::CommitCallbackRegistry::ScopedRegistrar registrar;
	LLUICtrl::EnableCallbackRegistry::ScopedRegistrar enable_registrar;
	
	registrar.add("People.Group.Plus.Action",  boost::bind(&LLPanelPeople::onGroupPlusMenuItemClicked,  this, _2));
	registrar.add("People.Friends.ViewSort.Action",  boost::bind(&LLPanelPeople::onFriendsViewSortMenuItemClicked,  this, _2));
	registrar.add("People.Nearby.ViewSort.Action",  boost::bind(&LLPanelPeople::onNearbyViewSortMenuItemClicked,  this, _2));
	registrar.add("People.Groups.ViewSort.Action",  boost::bind(&LLPanelPeople::onGroupsViewSortMenuItemClicked,  this, _2));
	registrar.add("People.Recent.ViewSort.Action",  boost::bind(&LLPanelPeople::onRecentViewSortMenuItemClicked,  this, _2));

	enable_registrar.add("People.Friends.ViewSort.CheckItem",	boost::bind(&LLPanelPeople::onFriendsViewSortMenuItemCheck,	this, _2));
	enable_registrar.add("People.Recent.ViewSort.CheckItem",	boost::bind(&LLPanelPeople::onRecentViewSortMenuItemCheck,	this, _2));
	
	LLMenuGL* plus_menu  = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_group_plus.xml",  gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
	mGroupPlusMenuHandle  = plus_menu->getHandle();

	LLMenuGL* nearby_view_sort  = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_people_nearby_view_sort.xml",  gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
	if(nearby_view_sort)
		mNearbyViewSortMenuHandle  = nearby_view_sort->getHandle();

	LLMenuGL* friend_view_sort  = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_people_friends_view_sort.xml",  gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
	if(friend_view_sort)
		mFriendsViewSortMenuHandle  = friend_view_sort->getHandle();

	LLMenuGL* group_view_sort  = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_people_groups_view_sort.xml",  gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
	if(group_view_sort)
		mGroupsViewSortMenuHandle  = group_view_sort->getHandle();

	LLMenuGL* recent_view_sort  = LLUICtrlFactory::getInstance()->createFromFile<LLMenuGL>("menu_people_recent_view_sort.xml",  gMenuHolder, LLViewerMenuHolderGL::child_registry_t::instance());
	if(recent_view_sort)
		mRecentViewSortMenuHandle  = recent_view_sort->getHandle();

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

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

	return TRUE;
}

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

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

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

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

	LLFriendCardsManager::folderid_buddies_map_t listMap;

	// *NOTE: For now collectFriendsLists returns data only for Friends/All folder. EXT-694.
	LLFriendCardsManager::instance().collectFriendsLists(listMap);
	if (listMap.size() > 0)
	{
		lldebugs << "Friends Cards were found, count: " << listMap.begin()->second.size() << llendl;
		all_friendsp = listMap.begin()->second;
	}
	else
	{
		lldebugs << "Friends Cards were not found" << llendl;
	}

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

	mOnlineFriendList->setDirty();
	mAllFriendList->setDirty();

	showFriendsAccordionsIfNeeded();
}

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

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

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

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

void LLPanelPeople::buttonSetVisible(std::string btn_name, BOOL visible)
{
	// Currently all bottom buttons are wrapped with layout panels.
	// Hiding a button has no effect: the panel still occupies its space.
	// So we have to hide the whole panel (along with its button)
	// to free some space up.
	LLButton* btn = getChild<LLView>("button_bar")->getChild<LLButton>(btn_name);
	LLPanel* btn_parent = dynamic_cast<LLPanel*>(btn->getParent());
	if (btn_parent)
		btn_parent->setVisible(visible);
}

void LLPanelPeople::buttonSetEnabled(const std::string& btn_name, bool enabled)
{
	// To make sure we're referencing the right widget (a child of the button bar).
	LLButton* button = getChild<LLView>("button_bar")->getChild<LLButton>(btn_name);
	button->setEnabled(enabled);
}

void LLPanelPeople::buttonSetAction(const std::string& btn_name, const commit_signal_t::slot_type& cb)
{
	// To make sure we're referencing the right widget (a child of the button bar).
	LLButton* button = getChild<LLView>("button_bar")->getChild<LLButton>(btn_name);
	button->setClickedCallback(cb);
}

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

	std::vector<LLUUID> selected_uuids;
	getCurrentItemIDs(selected_uuids);
	bool item_selected = (selected_uuids.size() == 1);

	buttonSetVisible("group_info_btn",		group_tab_active);
	buttonSetVisible("chat_btn",			group_tab_active);
	buttonSetVisible("add_friend_btn",		nearby_tab_active || recent_tab_active);
	buttonSetVisible("view_profile_btn",	!group_tab_active);
	buttonSetVisible("im_btn",				!group_tab_active);
	buttonSetVisible("teleport_btn",		friends_tab_active);
	buttonSetVisible("share_btn",			!recent_tab_active && false); // not implemented yet

	if (group_tab_active)
	{
		bool cur_group_active = true;

		if (item_selected)
		{
			selected_id = mGroupList->getSelectedUUID();
			cur_group_active = (gAgent.getGroupID() == selected_id);
		}

		LLPanel* groups_panel = mTabContainer->getCurrentPanel();
		groups_panel->childSetEnabled("activate_btn",	item_selected && !cur_group_active); // "none" or a non-active group selected
		groups_panel->childSetEnabled("plus_btn",		item_selected);
		groups_panel->childSetEnabled("minus_btn",		item_selected && selected_id.notNull());
	}
	else
	{
		bool is_friend = true;

		// Check whether selected avatar is our friend.
		if (item_selected)
		{
			selected_id = selected_uuids.front();
			is_friend = LLAvatarTracker::instance().getBuddyInfo(selected_id) != NULL;
		}

		childSetEnabled("add_friend_btn",	!is_friend);
	}

	buttonSetEnabled("teleport_btn",		friends_tab_active && item_selected);
	buttonSetEnabled("view_profile_btn",	item_selected);
	buttonSetEnabled("im_btn",				(selected_uuids.size() >= 1)); // allow starting the friends conference for multiple selection
	buttonSetEnabled("call_btn",			item_selected && false); // not implemented yet
	buttonSetEnabled("share_btn",			item_selected && false); // not implemented yet

	bool none_group_selected = item_selected && selected_id.isNull();
	buttonSetEnabled("group_info_btn", !none_group_selected);
	buttonSetEnabled("chat_btn", !none_group_selected);
}

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

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

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

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

		return mAllFriendList->getSelectedUUID();
	}

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

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

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

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

void LLPanelPeople::getCurrentItemIDs(std::vector<LLUUID>& selected_uuids) const
{
	std::string cur_tab = getActiveTabName();

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

}

void LLPanelPeople::showGroupMenu(LLMenuGL* menu)
{
	// Shows the menu at the top of the button bar.

	// Calculate its coordinates.
	// (assumes that groups panel is the current tab)
	LLPanel* bottom_panel = mTabContainer->getCurrentPanel()->getChild<LLPanel>("bottom_panel"); 
	LLPanel* parent_panel = mTabContainer->getCurrentPanel();
	menu->arrangeAndClear();
	S32 menu_height = menu->getRect().getHeight();
	S32 menu_x = -2; // *HACK: compensates HPAD in showPopup()
	S32 menu_y = bottom_panel->getRect().mTop + menu_height;

	// Actually show the menu.
	menu->buildDrawLabels();
	menu->updateParent(LLMenuGL::sMenuContainer);
	LLMenuGL::showPopup(parent_panel, menu, menu_x, menu_y);
}

void LLPanelPeople::setSortOrder(LLAvatarList* list, ESortOrder order, bool save)
{
	switch (order)
	{
	case E_SORT_BY_NAME:
		list->sortByName();
		break;
	case E_SORT_BY_STATUS:
		list->setComparator(&STATUS_COMPARATOR);
		list->sort();
		break;
	case E_SORT_BY_MOST_RECENT:
		list->setComparator(&RECENT_COMPARATOR);
		list->sort();
		break;
	default:
		llwarns << "Unrecognized people sort order for " << list->getName() << llendl;
		return;
	}

	if (save)
	{
		std::string setting;

		if (list == mAllFriendList || list == mOnlineFriendList)
			setting = "FriendsSortOrder";
		else if (list == mRecentList)
			setting = "RecentPeopleSortOrder";
		else if (list == mNearbyList)
			setting = "NearbyPeopleSortOrder"; // *TODO: unused by current implementation

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

void LLPanelPeople::onVisibilityChange(const LLSD& new_visibility)
{
	if (new_visibility.asBoolean() == FALSE)
	{
		// Don't update anything while we're invisible.
		mNearbyListUpdater->setActive(FALSE);
	}
	else
	{
		reSelectedCurrentTab();
	}
}

// Make the tab-container re-select current tab
// for onTabSelected() callback to get called.
// (currently this is needed to reactivate nearby list updates
// when we get visible)
void LLPanelPeople::reSelectedCurrentTab()
{
	mTabContainer->selectTab(mTabContainer->getCurrentPanelIndex());
}

void LLPanelPeople::onFilterEdit(const std::string& search_string)
{
	std::string search_upper = search_string;
	// Searches are case-insensitive
	LLStringUtil::toUpper(search_upper);
	LLStringUtil::trimHead(search_upper);

	if (mFilterSubString == search_upper)
		return;

	mFilterSubString = search_upper;

	// Apply new filter.
	mNearbyList->setNameFilter(mFilterSubString);
	mOnlineFriendList->setNameFilter(mFilterSubString);
	mAllFriendList->setNameFilter(mFilterSubString);
	mRecentList->setNameFilter(mFilterSubString);
	mGroupList->setNameFilter(mFilterSubString);

	showFriendsAccordionsIfNeeded();
}

void LLPanelPeople::onTabSelected(const LLSD& param)
{
	std::string tab_name = getChild<LLPanel>(param.asString())->getName();
	mNearbyListUpdater->setActive(tab_name == NEARBY_TAB_NAME);
	updateButtons();

	if (GROUP_TAB_NAME == tab_name)
		mFilterEditor->setLabel(getString("groups_filter_label"));
	else
		mFilterEditor->setLabel(getString("people_filter_label"));
}

void LLPanelPeople::onAvatarListDoubleClicked(LLAvatarList* list)
{
	LLUUID clicked_id = list->getSelectedUUID();

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

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

	updateButtons();
}

void LLPanelPeople::onViewProfileButtonClicked()
{
	LLUUID id = getCurrentItemID();
	LLAvatarActions::showProfile(id);
}

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

void LLPanelPeople::onAddFriendWizButtonClicked()
{
	// Show add friend wizard.
	LLFloaterAvatarPicker* picker = LLFloaterAvatarPicker::show(onAvatarPicked, NULL, FALSE, TRUE);
	LLFloater* root_floater = gFloaterView->getParentFloater(this);
	if (root_floater)
	{
		root_floater->addDependentFloater(picker);
	}
}

void LLPanelPeople::onDeleteFriendButtonClicked()
{
	std::vector<LLUUID> selected_uuids;
	getCurrentItemIDs(selected_uuids);

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

void LLPanelPeople::onGroupInfoButtonClicked()
{
	LLGroupActions::show(getCurrentItemID());
}

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

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

void LLPanelPeople::onActivateButtonClicked()
{
	LLGroupActions::activate(mGroupList->getSelectedUUID());
}

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

void LLPanelPeople::onGroupPlusButtonClicked()
{
	LLMenuGL* plus_menu = (LLMenuGL*)mGroupPlusMenuHandle.get();
	if (!plus_menu)
		return;

	showGroupMenu(plus_menu);
}

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

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

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

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

	if (chosen_item == "sort_name")
	{
		setSortOrder(mAllFriendList, E_SORT_BY_NAME);
	}
	else if (chosen_item == "sort_status")
	{
		setSortOrder(mAllFriendList, E_SORT_BY_STATUS);
	}
	else if (chosen_item == "view_icons")
	{
		mAllFriendList->toggleIcons();
		mOnlineFriendList->toggleIcons();
	}
}

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

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

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

	if (chosen_item == "sort_recent")
	{
	}
	else if (chosen_item == "sort_name")
	{
		mNearbyList->sortByName();
	}
	else if (chosen_item == "view_icons")
	{
		mNearbyList->toggleIcons();
	}
	else if (chosen_item == "sort_distance")
	{
	}
}
void LLPanelPeople::onRecentViewSortMenuItemClicked(const LLSD& userdata)
{
	std::string chosen_item = userdata.asString();

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

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

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

	return false;
}

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

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

	return false;
}

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

void LLPanelPeople::onTeleportButtonClicked()
{
	LLAvatarActions::offerTeleport(getCurrentItemID());
}

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

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

void LLPanelPeople::onFriendsViewSortButtonClicked()
{
	LLMenuGL* menu = (LLMenuGL*)mFriendsViewSortMenuHandle.get();
	if (!menu)
		return;
	showGroupMenu(menu);
}

void LLPanelPeople::onGroupsViewSortButtonClicked()
{
	LLMenuGL* menu = (LLMenuGL*)mGroupsViewSortMenuHandle.get();
	if (!menu)
		return;
	showGroupMenu(menu);
}

void LLPanelPeople::onRecentViewSortButtonClicked()
{
	LLMenuGL* menu = (LLMenuGL*)mRecentViewSortMenuHandle.get();
	if (!menu)
		return;
	showGroupMenu(menu);
}

void LLPanelPeople::onNearbyViewSortButtonClicked()
{
	LLMenuGL* menu = (LLMenuGL*)mNearbyViewSortMenuHandle.get();
	if (!menu)
		return;
	showGroupMenu(menu);
}

void	LLPanelPeople::onOpen(const LLSD& key)
{
	std::string tab_name = key["people_panel_tab_name"];
	mFilterEditor -> clear();
	onFilterEdit("");
	
	if (!tab_name.empty())
		mTabContainer->selectTabByName(tab_name);
	else
		reSelectedCurrentTab();
}

void LLPanelPeople::showAccordion(const std::string name, bool show)
{
	if(name.empty())
	{
		llwarns << "No name provided" << llendl;
		return;
	}

	LLAccordionCtrlTab* tab = getChild<LLAccordionCtrlTab>(name);
	tab->setVisible(show);
	if(show)
	{
		// expand accordion
		tab->changeOpenClose(false);
	}
}

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

		// Rearrange accordions
		LLAccordionCtrl* accordion = getChild<LLAccordionCtrl>("friends_accordion");
		accordion->arrange();
	}
}

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

	LLAccordionCtrl* accordion = getChild<LLAccordionCtrl>("friends_accordion");
	accordion->arrange();
}