/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2013, 2018-2020, 2022 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) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
 *   Copyright (C) 2007, 2009 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2006 Craig Edwards <brain@inspircd.org>
 *   Copyright (C) 2005, 2007 Robin Burchell <robin+git@viroteck.net>
 *
 * 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"

enum
{
	// From UnrealIRCd.
	ERR_NOOPERMOTD = 425,

	// From ircd-ratbox.
	RPL_OMOTDSTART = 720,
	RPL_OMOTD = 721,
	RPL_ENDOFOMOTD = 722
};

/** Handle /OPERMOTD
 */
class CommandOpermotd : public Command
{
 public:
	file_cache opermotd;

	CommandOpermotd(Module* Creator) : Command(Creator,"OPERMOTD", 0, 1)
	{
		flags_needed = 'o';
		syntax = "[<servername>]";
	}

	CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
	{
		if ((parameters.empty()) || (irc::equals(parameters[0], ServerInstance->Config->ServerName)))
			ShowOperMOTD(user, true);
		return CMD_SUCCESS;
	}

	RouteDescriptor GetRouting(User* user, const Params& parameters) CXX11_OVERRIDE
	{
		if ((!parameters.empty()) && (parameters[0].find('.') != std::string::npos))
			return ROUTE_OPT_UCAST(parameters[0]);
		return ROUTE_LOCALONLY;
	}

	void ShowOperMOTD(User* user, bool show_missing)
	{
		if (opermotd.empty())
		{
			if (show_missing)
				user->WriteRemoteNumeric(ERR_NOOPERMOTD, "OPERMOTD file is missing.");
			return;
		}

		user->WriteRemoteNumeric(RPL_OMOTDSTART, "Server operators message of the day");
		for (file_cache::const_iterator i = opermotd.begin(); i != opermotd.end(); ++i)
			user->WriteRemoteNumeric(RPL_OMOTD, *i);
		user->WriteRemoteNumeric(RPL_ENDOFOMOTD, "End of OPERMOTD");
	}
};


class ModuleOpermotd : public Module
{
	CommandOpermotd cmd;
	bool onoper;
 public:

	ModuleOpermotd()
		: cmd(this)
	{
	}

	Version GetVersion() CXX11_OVERRIDE
	{
		return Version("Adds the /OPERMOTD command which adds a special message of the day for server operators.", VF_VENDOR | VF_OPTCOMMON);
	}

	void OnOper(User* user, const std::string &opertype) CXX11_OVERRIDE
	{
		if (onoper && IS_LOCAL(user))
			cmd.ShowOperMOTD(user, false);
	}

	void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
	{
		cmd.opermotd.clear();
		ConfigTag* conf = ServerInstance->Config->ConfValue("opermotd");
		onoper = conf->getBool("onoper", true);

		try
		{
			FileReader reader(conf->getString("file", "opermotd", 1));

			const file_cache& lines = reader.GetVector();

			// Process the MOTD entry.
			cmd.opermotd.reserve(lines.size());
			for (file_cache::const_iterator it = lines.begin(); it != lines.end(); ++it)
			{
				// Some clients can not handle receiving RPL_OMOTD with an empty
				// trailing parameter so if a line is empty we replace it with
				// a single space.
				const std::string& line = *it;
				cmd.opermotd.push_back(line.empty() ? " " : line);
			}
			InspIRCd::ProcessColors(cmd.opermotd);
		}
		catch (CoreException&)
		{
			// Nothing happens here as we do the error handling in ShowOperMOTD.
		}
	}
};

MODULE_INIT(ModuleOpermotd)