/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2014, 2016 Attila Molnar <attilamolnar@hush.com>
 *   Copyright (C) 2013, 2016, 2018, 2020-2023 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
 *   Copyright (C) 2009-2010 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) 2007 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"
#include "core_user.h"

CommandNick::CommandNick(Module* parent)
	: SplitCommand(parent, "NICK", 1)
{
	allow_empty_last_param = true;
	penalty = 0;
	syntax = { "<newnick>" };
	works_before_reg = true;
}

/** Handle nick changes from users.
 * NOTE: If you are used to ircds based on ircd2.8, and are looking
 * for the client introduction code in here, youre in the wrong place.
 * You need to look in the spanningtree module for this!
 */
CmdResult CommandNick::HandleLocal(LocalUser* user, const Params& parameters)
{
	std::string newnick = parameters[0];

	// anything except the initial NICK gets a flood penalty
	if (user->IsFullyConnected())
		user->CommandFloodPenalty += 4000;

	if (newnick.empty())
	{
		user->WriteNumeric(ERR_NONICKNAMEGIVEN, "No nickname given");
		return CmdResult::FAILURE;
	}

	if (newnick == "0")
	{
		newnick = user->uuid;
	}
	else if (!ServerInstance->IsNick(newnick))
	{
		user->WriteNumeric(ERR_ERRONEUSNICKNAME, newnick, "Erroneous Nickname");
		return CmdResult::FAILURE;
	}

	ModResult MOD_RESULT;
	FIRST_MOD_RESULT(OnUserPreNick, MOD_RESULT, (user, newnick));

	// If a module denied the change, abort now
	if (MOD_RESULT == MOD_RES_DENY)
		return CmdResult::FAILURE;

	// Disallow the nick change if <security:restrictbannedusers> is on and there is a ban matching this user in
	// one of the channels they are on
	if (ServerInstance->Config->RestrictBannedUsers != ServerConfig::BUT_NORMAL)
	{
		for (const auto* memb : user->chans)
		{
			if (memb->chan->GetPrefixValue(user) < VOICE_VALUE && memb->chan->IsBanned(user))
			{
				if (ServerInstance->Config->RestrictBannedUsers == ServerConfig::BUT_RESTRICT_NOTIFY)
					user->WriteNumeric(ERR_CANTCHANGENICK, INSP_FORMAT("Cannot change nickname while on {} (you're banned)",
						memb->chan->name));
				return CmdResult::FAILURE;
			}
		}
	}

	if (!user->ChangeNick(newnick))
		return CmdResult::FAILURE;

	if (user->connected < User::CONN_NICKUSER)
	{
		user->connected |= User::CONN_NICK;
		return CommandUser::CheckRegister(user);
	}

	return CmdResult::SUCCESS;
}
