/** 
 * @file llviewquery.cpp
 * @brief Implementation of view query class.
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * 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 "linden_common.h"

#include "llview.h"
#include "lluictrl.h"
#include "llviewquery.h"

void LLQuerySorter::sort(LLView * parent, viewList_t &children) const {}

filterResult_t LLLeavesFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(children.empty(), TRUE);
}

filterResult_t LLRootsFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(TRUE, FALSE);
}

filterResult_t LLVisibleFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(view->getVisible(), view->getVisible());
}
filterResult_t LLEnabledFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(view->getEnabled(), view->getEnabled());
}
filterResult_t LLTabStopFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(view->isCtrl() && static_cast<const LLUICtrl*>(view)->hasTabStop(),
						view->canFocusChildren());
}

filterResult_t LLCtrlFilter::operator() (const LLView* const view, const viewList_t & children) const 
{
	return filterResult_t(view->isCtrl(),TRUE);
}

//
// LLViewQuery
//

viewList_t LLViewQuery::run(LLView* view) const
{
	viewList_t result;

	// prefilter gets immediate children of view
	filterResult_t pre = runFilters(view, *view->getChildList(), mPreFilters);
	if(!pre.first && !pre.second)
	{
		// not including ourselves or the children
		// nothing more to do
		return result;
	}

	viewList_t filtered_children;
	filterResult_t post(TRUE, TRUE);
	if(pre.second)
	{
		// run filters on children
		filterChildren(view, filtered_children);
		// only run post filters if this element passed pre filters
		// so if you failed to pass the pre filter, you can't filter out children in post
		if (pre.first)
		{
			post = runFilters(view, filtered_children, mPostFilters);
		}
	}

	if(pre.first && post.first) 
	{
		result.push_back(view);
	}

	if(pre.second && post.second)
	{
		result.insert(result.end(), filtered_children.begin(), filtered_children.end());
	}

	return result;
}

void LLViewQuery::filterChildren(LLView* parent_view, viewList_t & filtered_children) const
{
	LLView::child_list_t views(*(parent_view->getChildList()));
	if (mSorterp)
	{
		mSorterp->sort(parent_view, views); // sort the children per the sorter
	}
	for(LLView::child_list_iter_t iter = views.begin();
		iter != views.end();
		iter++)
	{
		viewList_t indiv_children = this->run(*iter);
		filtered_children.splice(filtered_children.end(), indiv_children);
	}
}

filterResult_t LLViewQuery::runFilters(LLView * view, const viewList_t children, const filterList_t filters) const
{
	filterResult_t result = filterResult_t(TRUE, TRUE);
	for(filterList_const_iter_t iter = filters.begin();
		iter != filters.end();
		iter++)
	{
		filterResult_t filtered = (**iter)(view, children);
		result.first = result.first && filtered.first;
		result.second = result.second && filtered.second;
	}
	return result;
}
