/** 
 * @file llscriptresourceconsumer.cpp
 * @brief An interface for a script resource consumer.
 *
 * $LicenseInfo:firstyear=2008&license=viewergpl$
 * 
 * Copyright (c) 2008-2009, 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 "llscriptresourceconsumer.h"

#include "llscriptresourcepool.h"

LLScriptResourceConsumer::LLScriptResourceConsumer()
	: mScriptResourcePool(&LLScriptResourcePool::null)
{ }

// Get the resource pool this consumer is currently using.
// virtual 
LLScriptResourcePool& LLScriptResourceConsumer::getScriptResourcePool()
{
	return *mScriptResourcePool;
}

// Get the resource pool this consumer is currently using.
// virtual 
const LLScriptResourcePool& LLScriptResourceConsumer::getScriptResourcePool() const
{
	return *mScriptResourcePool;
}

// virtual
void LLScriptResourceConsumer::setScriptResourcePool(LLScriptResourcePool& new_pool)
{
	mScriptResourcePool = &new_pool;
}

bool LLScriptResourceConsumer::switchScriptResourcePools(LLScriptResourcePool& new_pool)
{
	if (&new_pool == &LLScriptResourcePool::null)
	{
		llwarns << "New pool is null" << llendl;
	}

	if (isInPool(new_pool))
	{
		return true;
	}

	if (!canUseScriptResourcePool(new_pool))
	{
		return false;
	}

	S32 used_urls = getUsedPublicURLs();
	
	getScriptResourcePool().getPublicURLResource().release( used_urls );
	setScriptResourcePool(new_pool);
	getScriptResourcePool().getPublicURLResource().request( used_urls );
	
	return true;
}

bool LLScriptResourceConsumer::canUseScriptResourcePool(const LLScriptResourcePool& resource_pool)
{
	if (isInPool(resource_pool))
	{
		return true;
	}

	if (resource_pool.getPublicURLResource().getAvailable() < getUsedPublicURLs())
	{
		return false;
	}
	
	return true;
}

bool LLScriptResourceConsumer::isInPool(const LLScriptResourcePool& resource_pool)
{
	const LLScriptResourcePool& current_pool = getScriptResourcePool();
	if ( &resource_pool == &current_pool )
	{
		// This consumer is already in this pool
		return true;
	}
	return false;
}