/** 
 * @file llurlwhitelist.cpp
 * @author Callum Prentice
 * @brief maintains a "white list" of acceptable URLS that are stored on disk
 *
 * $LicenseInfo:firstyear=2005&license=viewerlgpl$
 * 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 "llurlwhitelist.h"

#include <iostream>
#include <fstream>

///////////////////////////////////////////////////////////////////////////////
//
LLUrlWhiteList::LLUrlWhiteList () :
	mLoaded ( false ),
	mFilename ( "url_whitelist.ini" ),
	mUrlList ( 0 ),
	mCurIndex ( 0 )
{
}

///////////////////////////////////////////////////////////////////////////////
//
LLUrlWhiteList::~LLUrlWhiteList ()
{
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::load ()
{
	// don't load if we're already loaded
	if ( mLoaded )
		return ( true );

	// remove current entries before we load over them
	clear ();

	// build filename for each user
	std::string resolvedFilename = gDirUtilp->getExpandedFilename ( LL_PATH_PER_SL_ACCOUNT, mFilename );

	// open a file for reading
	llifstream file(resolvedFilename.c_str());
	if ( file.is_open () )
	{
		// add each line in the file to the list
		std::string line;
		while ( std::getline ( file, line ) )
		{
			addItem ( line, false );
		};

		file.close ();

		// flag as loaded
		mLoaded = true;

		return true;
	};

	return false;
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::save ()
{
	// build filename for each user
	std::string resolvedFilename = gDirUtilp->getExpandedFilename ( LL_PATH_PER_SL_ACCOUNT, mFilename );

	if (resolvedFilename.empty())
	{
		LL_INFOS() << "No per-user dir for saving URL whitelist - presumably not logged in yet.  Skipping." << LL_ENDL;
		return false;
	}

	// open a file for writing
	llofstream file(resolvedFilename.c_str());
	if ( file.is_open () )
	{
		// for each entry we have
		for ( string_list_t::iterator iter = mUrlList.begin (); iter != mUrlList.end (); ++iter )
		{
			file << ( *iter ) << std::endl;
		}

		file.close ();

		return true;
	};

	return false;
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::clear ()
{
	mUrlList.clear ();

	mCurIndex = 0;

	return true;
}

std::string url_cleanup(std::string pattern)
{
	LLStringUtil::trim(pattern);
	S32 length = pattern.length();
	S32 position = 0;
	std::string::reverse_iterator it = pattern.rbegin();
	++it;	// skip last char, might be '/'
	++position;
	for (; it < pattern.rend(); ++it)
	{
		char c = *it;
		if (c == '/')
		{
			// found second to last '/'
			S32 desired_length = length - position;
			LLStringUtil::truncate(pattern, desired_length);
			break;
		}
		++position;
	}
	return pattern;
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::addItem ( const std::string& itemIn, bool saveAfterAdd )
{
	std::string item = url_cleanup(itemIn);
	
	mUrlList.push_back ( item );

	// use this when all you want to do is call addItem ( ... ) where necessary
	if ( saveAfterAdd )
		save ();

	return true;
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::getFirst ( std::string& valueOut )
{
	if ( mUrlList.size () == 0 )
		return false;

	mCurIndex = 0;
	valueOut = mUrlList[mCurIndex++];

	return true;	
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::getNext ( std::string& valueOut )
{
	if ( mCurIndex >= mUrlList.size () )
		return false;

	valueOut = mUrlList[mCurIndex++];

	return true;
}

///////////////////////////////////////////////////////////////////////////////
//
bool LLUrlWhiteList::containsMatch ( const std::string& patternIn )
{
	return false;
}
