/** 
* @file llinventoryfilter.cpp
* @brief Support for filtering your inventory to only display a subset of the
* available items.
*
* $LicenseInfo:firstyear=2005&license=viewergpl$
* 
* Copyright (c) 2005-2009, 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"

#include "llinventoryfilter.h"

// viewer includes
#include "llfoldervieweventlistener.h"
#include "llfolderviewitem.h"
#include "llinventorymodel.h"	// gInventory.backgroundFetchActive()
#include "llviewercontrol.h"
#include "llviewerinventory.h"

// linden library includes
#include "lltrans.h"

///----------------------------------------------------------------------------
/// Class LLInventoryFilter
///----------------------------------------------------------------------------
LLInventoryFilter::LLInventoryFilter(const std::string& name)
:	mName(name),
	mModified(FALSE),
	mNeedTextRebuild(TRUE)
{
	mFilterOps.mFilterTypes = 0xffffffffffffffffULL;
	mFilterOps.mMinDate = time_min();
	mFilterOps.mMaxDate = time_max();
	mFilterOps.mHoursAgo = 0;
	mFilterOps.mShowFolderState = SHOW_NON_EMPTY_FOLDERS;
	mFilterOps.mPermissions = PERM_NONE;
	mFilterOps.mFilterForCategories = FALSE;

	mOrder = SO_FOLDERS_BY_NAME; // This gets overridden by a pref immediately

	mSubStringMatchOffset = 0;
	mFilterSubString.clear();
	mFilterGeneration = 0;
	mMustPassGeneration = S32_MAX;
	mMinRequiredGeneration = 0;
	mFilterCount = 0;
	mNextFilterGeneration = mFilterGeneration + 1;

	mLastLogoff = gSavedPerAccountSettings.getU32("LastLogoff");
	mFilterBehavior = FILTER_NONE;

	// copy mFilterOps into mDefaultFilterOps
	markDefault();
}

LLInventoryFilter::~LLInventoryFilter()
{
}

BOOL LLInventoryFilter::check(LLFolderViewItem* item) 
{
	time_t earliest;

	earliest = time_corrected() - mFilterOps.mHoursAgo * 3600;
	if (mFilterOps.mMinDate > time_min() && mFilterOps.mMinDate < earliest)
	{
		earliest = mFilterOps.mMinDate;
	}
	else if (!mFilterOps.mHoursAgo)
	{
		earliest = 0;
	}
	LLFolderViewEventListener* listener = item->getListener();
	mSubStringMatchOffset = mFilterSubString.size() ? item->getSearchableLabel().find(mFilterSubString) : std::string::npos;

	bool passed_type = false;
	if (mFilterOps.mFilterForCategories)
	{
		if (listener->getInventoryType() == LLInventoryType::IT_CATEGORY)
		{
			LLViewerInventoryCategory *cat = gInventory.getCategory(listener->getUUID());
			if (cat)
			{
				passed_type |= ((1LL << cat->getPreferredType() & mFilterOps.mFilterTypes) != U64(0));
			}
		}
	}
	else
	{
		LLInventoryType::EType type = listener->getInventoryType();
		passed_type |= ((1LL << type & mFilterOps.mFilterTypes) != U64(0));
		if (type == LLInventoryType::IT_NONE)
		{
			const LLInventoryObject *obj = gInventory.getObject(listener->getUUID());
			if (obj && obj->getIsLinkType())
			{
				passed_type = FALSE;
			}
			else
			{
				passed_type = TRUE;
			}
		}
	}

	BOOL passed = passed_type
		&& (mFilterSubString.size() == 0 || mSubStringMatchOffset != std::string::npos)
		&& ((listener->getPermissionMask() & mFilterOps.mPermissions) == mFilterOps.mPermissions)
		&& (listener->getCreationDate() >= earliest && listener->getCreationDate() <= mFilterOps.mMaxDate);

	BOOL is_folder = (dynamic_cast<LLFolderViewFolder*>(item) != NULL);
	if (is_folder && mFilterOps.mShowFolderState == LLInventoryFilter::SHOW_ALL_FOLDERS)
	{
		passed = TRUE;
	}

	return passed;
}

const std::string LLInventoryFilter::getFilterSubString(BOOL trim)
{
	return mFilterSubString;
}

std::string::size_type LLInventoryFilter::getStringMatchOffset() const
{
	return mSubStringMatchOffset;
}

// has user modified default filter params?
BOOL LLInventoryFilter::isNotDefault()
{
	return mFilterOps.mFilterTypes != mDefaultFilterOps.mFilterTypes 
		|| mFilterSubString.size() 
		|| mFilterOps.mPermissions != mDefaultFilterOps.mPermissions
		|| mFilterOps.mMinDate != mDefaultFilterOps.mMinDate 
		|| mFilterOps.mMaxDate != mDefaultFilterOps.mMaxDate
		|| mFilterOps.mHoursAgo != mDefaultFilterOps.mHoursAgo;
}

BOOL LLInventoryFilter::isActive()
{
	return mFilterOps.mFilterTypes != 0xffffffffffffffffULL 
		|| mFilterSubString.size() 
		|| mFilterOps.mPermissions != PERM_NONE 
		|| mFilterOps.mMinDate != time_min()
		|| mFilterOps.mMaxDate != time_max()
		|| mFilterOps.mHoursAgo != 0;
}

BOOL LLInventoryFilter::isModified()
{
	return mModified;
}

BOOL LLInventoryFilter::isModifiedAndClear()
{
	BOOL ret = mModified;
	mModified = FALSE;
	return ret;
}

void LLInventoryFilter::setFilterTypes(U64 types, BOOL filter_for_categories)
{
	if (mFilterOps.mFilterTypes != types)
	{
		// keep current items only if no type bits getting turned off
		BOOL fewer_bits_set = (mFilterOps.mFilterTypes & ~types);
		BOOL more_bits_set = (~mFilterOps.mFilterTypes & types);

		mFilterOps.mFilterTypes = types;
		if (more_bits_set && fewer_bits_set)
		{
			// neither less or more restrive, both simultaneously
			// so we need to filter from scratch
			setModified(FILTER_RESTART);
		}
		else if (more_bits_set)
		{
			// target is only one of all requested types so more type bits == less restrictive
			setModified(FILTER_LESS_RESTRICTIVE);
		}
		else if (fewer_bits_set)
		{
			setModified(FILTER_MORE_RESTRICTIVE);
		}
	}
	mFilterOps.mFilterForCategories = filter_for_categories;
}

void LLInventoryFilter::setFilterSubString(const std::string& string)
{
	if (mFilterSubString != string)
	{
		// hitting BACKSPACE, for example
		BOOL less_restrictive = mFilterSubString.size() >= string.size() && !mFilterSubString.substr(0, string.size()).compare(string);
		// appending new characters
		BOOL more_restrictive = mFilterSubString.size() < string.size() && !string.substr(0, mFilterSubString.size()).compare(mFilterSubString);
		mFilterSubString = string;
		LLStringUtil::toUpper(mFilterSubString);
		LLStringUtil::trimHead(mFilterSubString);

		if (less_restrictive)
		{
			setModified(FILTER_LESS_RESTRICTIVE);
		}
		else if (more_restrictive)
		{
			setModified(FILTER_MORE_RESTRICTIVE);
		}
		else
		{
			setModified(FILTER_RESTART);
		}
	}
}

void LLInventoryFilter::setFilterPermissions(PermissionMask perms)
{
	if (mFilterOps.mPermissions != perms)
	{
		// keep current items only if no perm bits getting turned off
		BOOL fewer_bits_set = (mFilterOps.mPermissions & ~perms);
		BOOL more_bits_set = (~mFilterOps.mPermissions & perms);
		mFilterOps.mPermissions = perms;

		if (more_bits_set && fewer_bits_set)
		{
			setModified(FILTER_RESTART);
		}
		else if (more_bits_set)
		{
			// target must have all requested permission bits, so more bits == more restrictive
			setModified(FILTER_MORE_RESTRICTIVE);
		}
		else if (fewer_bits_set)
		{
			setModified(FILTER_LESS_RESTRICTIVE);
		}
	}
}

void LLInventoryFilter::setDateRange(time_t min_date, time_t max_date)
{
	mFilterOps.mHoursAgo = 0;
	if (mFilterOps.mMinDate != min_date)
	{
		mFilterOps.mMinDate = min_date;
		setModified();
	}
	if (mFilterOps.mMaxDate != llmax(mFilterOps.mMinDate, max_date))
	{
		mFilterOps.mMaxDate = llmax(mFilterOps.mMinDate, max_date);
		setModified();
	}
}

void LLInventoryFilter::setDateRangeLastLogoff(BOOL sl)
{
	if (sl && !isSinceLogoff())
	{
		setDateRange(mLastLogoff, time_max());
		setModified();
	}
	if (!sl && isSinceLogoff())
	{
		setDateRange(0, time_max());
		setModified();
	}
}

BOOL LLInventoryFilter::isSinceLogoff()
{
	return (mFilterOps.mMinDate == (time_t)mLastLogoff) &&
		(mFilterOps.mMaxDate == time_max());
}

void LLInventoryFilter::setHoursAgo(U32 hours)
{
	if (mFilterOps.mHoursAgo != hours)
	{
		// *NOTE: need to cache last filter time, in case filter goes stale
		BOOL less_restrictive = (mFilterOps.mMinDate == time_min() && mFilterOps.mMaxDate == time_max() && hours > mFilterOps.mHoursAgo);
		BOOL more_restrictive = (mFilterOps.mMinDate == time_min() && mFilterOps.mMaxDate == time_max() && hours <= mFilterOps.mHoursAgo);
		mFilterOps.mHoursAgo = hours;
		mFilterOps.mMinDate = time_min();
		mFilterOps.mMaxDate = time_max();
		if (less_restrictive)
		{
			setModified(FILTER_LESS_RESTRICTIVE);
		}
		else if (more_restrictive)
		{
			setModified(FILTER_MORE_RESTRICTIVE);
		}
		else
		{
			setModified(FILTER_RESTART);
		}
	}
}
void LLInventoryFilter::setShowFolderState(EFolderShow state)
{
	if (mFilterOps.mShowFolderState != state)
	{
		mFilterOps.mShowFolderState = state;
		if (state == SHOW_NON_EMPTY_FOLDERS)
		{
			// showing fewer folders than before
			setModified(FILTER_MORE_RESTRICTIVE);
		}
		else if (state == SHOW_ALL_FOLDERS)
		{
			// showing same folders as before and then some
			setModified(FILTER_LESS_RESTRICTIVE);
		}
		else
		{
			setModified();
		}
	}
}

void LLInventoryFilter::setSortOrder(U32 order)
{
	if (mOrder != order)
	{
		mOrder = order;
		setModified();
	}
}

void LLInventoryFilter::markDefault()
{
	mDefaultFilterOps = mFilterOps;
}

void LLInventoryFilter::resetDefault()
{
	mFilterOps = mDefaultFilterOps;
	setModified();
}

void LLInventoryFilter::setModified(EFilterBehavior behavior)
{
	mModified = TRUE;
	mNeedTextRebuild = TRUE;
	mFilterGeneration = mNextFilterGeneration++;

	if (mFilterBehavior == FILTER_NONE)
	{
		mFilterBehavior = behavior;
	}
	else if (mFilterBehavior != behavior)
	{
		// trying to do both less restrictive and more restrictive filter
		// basically means restart from scratch
		mFilterBehavior = FILTER_RESTART;
	}

	if (isNotDefault())
	{
		// if not keeping current filter results, update last valid as well
		switch(mFilterBehavior)
		{
		case FILTER_RESTART:
			mMustPassGeneration = mFilterGeneration;
			mMinRequiredGeneration = mFilterGeneration;
			break;
		case FILTER_LESS_RESTRICTIVE:
			mMustPassGeneration = mFilterGeneration;
			break;
		case FILTER_MORE_RESTRICTIVE:
			mMinRequiredGeneration = mFilterGeneration;
			// must have passed either current filter generation (meaningless, as it hasn't been run yet)
			// or some older generation, so keep the value
			mMustPassGeneration = llmin(mMustPassGeneration, mFilterGeneration);
			break;
		default:
			llerrs << "Bad filter behavior specified" << llendl;
		}
	}
	else
	{
		// shortcut disabled filters to show everything immediately
		mMinRequiredGeneration = 0;
		mMustPassGeneration = S32_MAX;
	}
}

BOOL LLInventoryFilter::isFilterWith(LLInventoryType::EType t)
{
	return mFilterOps.mFilterTypes & (1LL << t);
}

std::string LLInventoryFilter::getFilterText()
{
	if (!mNeedTextRebuild)
	{
		return mFilterText;
	}

	mNeedTextRebuild = FALSE;
	std::string filtered_types;
	std::string not_filtered_types;
	BOOL filtered_by_type = FALSE;
	BOOL filtered_by_all_types = TRUE;
	S32 num_filter_types = 0;
	mFilterText.clear();

	if (isFilterWith(LLInventoryType::IT_ANIMATION))
	{
		//filtered_types += " Animations,";
		filtered_types += LLTrans::getString("Animations");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Animations,";
		not_filtered_types += LLTrans::getString("Animations");

		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_CALLINGCARD))
	{
		//filtered_types += " Calling Cards,";
		filtered_types += LLTrans::getString("Calling Cards");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Calling Cards,";
		not_filtered_types += LLTrans::getString("Calling Cards");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_WEARABLE))
	{
		//filtered_types += " Clothing,";
		filtered_types +=  LLTrans::getString("Clothing");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Clothing,";
		not_filtered_types +=  LLTrans::getString("Clothing");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_GESTURE))
	{
		//filtered_types += " Gestures,";
		filtered_types +=  LLTrans::getString("Gestures");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Gestures,";
		not_filtered_types +=  LLTrans::getString("Gestures");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_LANDMARK))
	{
		//filtered_types += " Landmarks,";
		filtered_types +=  LLTrans::getString("Landmarks");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Landmarks,";
		not_filtered_types +=  LLTrans::getString("Landmarks");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_NOTECARD))
	{
		//filtered_types += " Notecards,";
		filtered_types +=  LLTrans::getString("Notecards");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Notecards,";
		not_filtered_types +=  LLTrans::getString("Notecards");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_OBJECT) && isFilterWith(LLInventoryType::IT_ATTACHMENT))
	{
		//filtered_types += " Objects,";
		filtered_types +=  LLTrans::getString("Objects");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Objects,";
		not_filtered_types +=  LLTrans::getString("Objects");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_LSL))
	{
		//filtered_types += " Scripts,";
		filtered_types +=  LLTrans::getString("Scripts");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Scripts,";
		not_filtered_types +=  LLTrans::getString("Scripts");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_SOUND))
	{
		//filtered_types += " Sounds,";
		filtered_types +=  LLTrans::getString("Sounds");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Sounds,";
		not_filtered_types +=  LLTrans::getString("Sounds");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_TEXTURE))
	{
		//filtered_types += " Textures,";
		filtered_types +=  LLTrans::getString("Textures");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Textures,";
		not_filtered_types +=  LLTrans::getString("Textures");
		filtered_by_all_types = FALSE;
	}

	if (isFilterWith(LLInventoryType::IT_SNAPSHOT))
	{
		//filtered_types += " Snapshots,";
		filtered_types +=  LLTrans::getString("Snapshots");
		filtered_by_type = TRUE;
		num_filter_types++;
	}
	else
	{
		//not_filtered_types += " Snapshots,";
		not_filtered_types +=  LLTrans::getString("Snapshots");
		filtered_by_all_types = FALSE;
	}

	if (!gInventory.backgroundFetchActive()
		&& filtered_by_type
		&& !filtered_by_all_types)
	{
		mFilterText += " - ";
		if (num_filter_types < 5)
		{
			mFilterText += filtered_types;
		}
		else
		{
			//mFilterText += "No ";
			mFilterText += LLTrans::getString("No Filters");
			mFilterText += not_filtered_types;
		}
		// remove the ',' at the end
		mFilterText.erase(mFilterText.size() - 1, 1);
	}

	if (isSinceLogoff())
	{
		//mFilterText += " - Since Logoff";
		mFilterText += LLTrans::getString("Since Logoff");
	}
	return mFilterText;
}

void LLInventoryFilter::toLLSD(LLSD& data)
{
	data["filter_types"] = (LLSD::Integer)getFilterTypes();
	data["min_date"] = (LLSD::Integer)getMinDate();
	data["max_date"] = (LLSD::Integer)getMaxDate();
	data["hours_ago"] = (LLSD::Integer)getHoursAgo();
	data["show_folder_state"] = (LLSD::Integer)getShowFolderState();
	data["permissions"] = (LLSD::Integer)getFilterPermissions();
	data["substring"] = (LLSD::String)getFilterSubString();
	data["sort_order"] = (LLSD::Integer)getSortOrder();
	data["since_logoff"] = (LLSD::Boolean)isSinceLogoff();
}

void LLInventoryFilter::fromLLSD(LLSD& data)
{
	if(data.has("filter_types"))
	{
		setFilterTypes((U32)data["filter_types"].asInteger());
	}

	if(data.has("min_date") && data.has("max_date"))
	{
		setDateRange(data["min_date"].asInteger(), data["max_date"].asInteger());
	}

	if(data.has("hours_ago"))
	{
		setHoursAgo((U32)data["hours_ago"].asInteger());
	}

	if(data.has("show_folder_state"))
	{
		setShowFolderState((EFolderShow)data["show_folder_state"].asInteger());
	}

	if(data.has("permissions"))
	{
		setFilterPermissions((PermissionMask)data["permissions"].asInteger());
	}

	if(data.has("substring"))
	{
		setFilterSubString(std::string(data["substring"].asString()));
	}

	if(data.has("sort_order"))
	{
		setSortOrder((U32)data["sort_order"].asInteger());
	}

	if(data.has("since_logoff"))
	{
		setDateRangeLastLogoff((bool)data["since_logoff"].asBoolean());
	}
}