/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2013, 2018 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2012-2013, 2016 Attila Molnar <attilamolnar@hush.com>
 *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
 *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
 *   Copyright (C) 2009 Thomas Stagner <aquanight@inspircd.org>
 *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2005-2006, 2010 Craig Edwards <brain@inspircd.org>
 *
 * This file is part of InspIRCd.  InspIRCd is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 2.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#include "inspircd.h"

class ModuleOperLevels final
	: public Module
{
	public:
		ModuleOperLevels()
			: Module(VF_VENDOR, "Allows the server administrator to define ranks for server operators which prevent lower ranked server operators from using /KILL on higher ranked server operators.")
		{
		}

		ModResult OnKill(User* source, User* dest, const std::string &reason) override
		{
			// oper killing an oper?
			if (dest->IsOper() && source->IsOper())
			{
				unsigned long dest_level = ConvToNum<unsigned long>(dest->oper->getConfig("level"));
				unsigned long source_level = ConvToNum<unsigned long>(source->oper->getConfig("level"));

				if (dest_level > source_level)
				{
					if (IS_LOCAL(source))
					{
						ServerInstance->SNO.WriteGlobalSno('a', "Oper %s (level %lu) attempted to /KILL a higher level oper: %s (level %lu), reason: %s",
							source->nick.c_str(), source_level, dest->nick.c_str(), dest_level, reason.c_str());
					}
					dest->WriteNotice("*** Oper " + source->nick + " attempted to /KILL you!");
					source->WriteNumeric(ERR_NOPRIVILEGES, InspIRCd::Format("Permission Denied - Oper %s is a higher level than you", dest->nick.c_str()));
					return MOD_RES_DENY;
				}
			}
			return MOD_RES_PASSTHRU;
		}
};

MODULE_INIT(ModuleOperLevels)