/* BotServ core functions
 *
 * (C) 2003-2022 Anope Team
 * Contact us at team@anope.org
 *
 * Please read COPYING and README for further details.
 *
 * Based on the original code of Epona by Lara.
 * Based on the original code of Services by Andy Church.
 */

#include "module.h"

class CommandBSBot : public Command
{
 private:
	void DoAdd(CommandSource &source, const std::vector<Anope::string> &params)
	{
		const Anope::string &nick = params[1];
		const Anope::string &user = params[2];
		const Anope::string &host = params[3];
		const Anope::string &real = params[4];

		if (BotInfo::Find(nick, true))
		{
			source.Reply(_("Bot \002%s\002 already exists."), nick.c_str());
			return;
		}

		Configuration::Block *networkinfo = Config->GetBlock("networkinfo");

		if (nick.length() > networkinfo->Get<unsigned>("nicklen"))
		{
			source.Reply(_("Bot nicks may only be %d characters long."), networkinfo->Get<unsigned>("nicklen"));
			return;
		}

		if (user.length() > networkinfo->Get<unsigned>("userlen"))
		{
			source.Reply(_("Bot idents may only be %d characters long."), networkinfo->Get<unsigned>("userlen"));
			return;
		}

		if (host.length() > networkinfo->Get<unsigned>("hostlen"))
		{
			source.Reply(_("Bot hosts may only be %d characters long."), networkinfo->Get<unsigned>("hostlen"));
			return;
		}

		if (!IRCD->IsNickValid(nick))
		{
			source.Reply(_("Bot nicks may only contain valid nick characters."));
			return;
		}

		if (!IRCD->IsIdentValid(user))
		{
			source.Reply(_("Bot idents may only contain valid ident characters."));
			return;
		}

		if (!IRCD->IsHostValid(host))
		{
			source.Reply(_("Bot hosts may only contain valid host characters."));
			return;
		}

		/* We check whether the nick is registered, and inform the user
		* if so. You need to drop the nick manually before you can use
		* it as a bot nick from now on -GD
		*/
		if (NickAlias::Find(nick))
		{
			source.Reply(NICK_ALREADY_REGISTERED, nick.c_str());
			return;
		}

		User *u = User::Find(nick, true);
		if (u)
		{
			source.Reply(_("Nick \002%s\002 is currently in use."), u->nick.c_str());
			return;
		}

		BotInfo *bi = new BotInfo(nick, user, host, real);

		Log(LOG_ADMIN, source, this) << "ADD " << bi->GetMask() << " " << bi->realname;

		source.Reply(_("%s!%s@%s (%s) added to the bot list."), bi->nick.c_str(), bi->GetIdent().c_str(), bi->host.c_str(), bi->realname.c_str());

		FOREACH_MOD(OnBotCreate, (bi));
		return;
	}

	void DoChange(CommandSource &source, const std::vector<Anope::string> &params)
	{
		const Anope::string &oldnick = params[1];
		const Anope::string &nick = params.size() > 2 ? params[2] : "";
		const Anope::string &user = params.size() > 3 ? params[3] : "";
		const Anope::string &host = params.size() > 4 ? params[4] : "";
		const Anope::string &real = params.size() > 5 ? params[5] : "";

		if (oldnick.empty() || nick.empty())
		{
			this->OnSyntaxError(source, "CHANGE");
			return;
		}

		BotInfo *bi = BotInfo::Find(oldnick, true);
		if (!bi)
		{
			source.Reply(BOT_DOES_NOT_EXIST, oldnick.c_str());
			return;
		}

		if (bi->conf)
		{
			source.Reply(_("Bot %s is not changeable."), bi->nick.c_str());
			return;
		}

		Configuration::Block *networkinfo = Config->GetBlock("networkinfo");

		if (nick.length() > networkinfo->Get<unsigned>("nicklen"))
		{
			source.Reply(_("Bot nicks may only be %d characters long."), networkinfo->Get<unsigned>("nicklen"));
			return;
		}

		if (user.length() > networkinfo->Get<unsigned>("userlen"))
		{
			source.Reply(_("Bot idents may only be %d characters long."), networkinfo->Get<unsigned>("userlen"));
			return;
		}

		if (host.length() > networkinfo->Get<unsigned>("hostlen"))
		{
			source.Reply(_("Bot hosts may only be %d characters long."), networkinfo->Get<unsigned>("hostlen"));
			return;
		}

		/* Checks whether there *are* changes.
		* Case sensitive because we may want to change just the case.
		* And we must finally check that the nick is not already
		* taken by another bot.
		*/
		if (nick.equals_cs(bi->nick) && (!user.empty() ? user.equals_cs(bi->GetIdent()) : 1) && (!host.empty() ? host.equals_cs(bi->host) : 1) && (!real.empty() ? real.equals_cs(bi->realname) : 1))
		{
			source.Reply(_("The old information is the same as the new information specified."));
			return;
		}

		if (!IRCD->IsNickValid(nick))
		{
			source.Reply(_("Bot nicks may only contain valid nick characters."));
			return;
		}

		if (!user.empty() && !IRCD->IsIdentValid(user))
		{
			source.Reply(_("Bot idents may only contain valid ident characters."));
			return;
		}

		if (!host.empty() && !IRCD->IsHostValid(host))
		{
			source.Reply(_("Bot hosts may only contain valid host characters."));
			return;
		}

		if (!nick.equals_ci(bi->nick))
		{
			if (BotInfo::Find(nick, true))
			{
				source.Reply(_("Bot \002%s\002 already exists."), nick.c_str());
				return;
			}

			if (User::Find(nick, true))
			{
				source.Reply(_("Nick \002%s\002 is currently in use."), nick.c_str());
				return;
			}
		}

		if (!nick.equals_ci(bi->nick))
		{
			/* We check whether the nick is registered, and inform the user
			* if so. You need to drop the nick manually before you can use
			* it as a bot nick from now on -GD
			*/
			if (NickAlias::Find(nick))
			{
				source.Reply(NICK_ALREADY_REGISTERED, nick.c_str());
				return;
			}

			/* The new nick is really different, so we remove the Q line for the old nick. */
			XLine x_del(bi->nick);
			IRCD->SendSQLineDel(&x_del);

			/* Add a Q line for the new nick */
			XLine x(nick, "Reserved for services");
			IRCD->SendSQLine(NULL, &x);
		}

		if (!user.empty())
		{
			IRCD->SendQuit(bi, "Quit: Be right back");
			bi->introduced = false;
		}
		else
			IRCD->SendNickChange(bi, nick);

		if (!nick.equals_cs(bi->nick))
			bi->SetNewNick(nick);

		if (!user.empty() && !user.equals_cs(bi->GetIdent()))
			bi->SetIdent(user);
		if (!host.empty() && !host.equals_cs(bi->host))
			bi->host = host;
		if (!real.empty() && !real.equals_cs(bi->realname))
			bi->realname = real;

		if (!user.empty())
			bi->OnKill();

		source.Reply(_("Bot \002%s\002 has been changed to %s!%s@%s (%s)."), oldnick.c_str(), bi->nick.c_str(), bi->GetIdent().c_str(), bi->host.c_str(), bi->realname.c_str());
		Log(LOG_ADMIN, source, this) << "CHANGE " << oldnick << " to " << bi->GetMask() << " " << bi->realname;

		FOREACH_MOD(OnBotChange, (bi));
		return;
	}

	void DoDel(CommandSource &source, const std::vector<Anope::string> &params)
	{
		const Anope::string &nick = params[1];

		if (nick.empty())
		{
			this->OnSyntaxError(source, "DEL");
			return;
		}

		BotInfo *bi = BotInfo::Find(nick, true);
		if (!bi)
		{
			source.Reply(BOT_DOES_NOT_EXIST, nick.c_str());
			return;
		}

		if (bi->conf)
		{
			source.Reply(_("Bot %s is not deletable."), bi->nick.c_str());
			return;
		}

		FOREACH_MOD(OnBotDelete, (bi));

		Log(LOG_ADMIN, source, this) << "DEL " << bi->nick;

		source.Reply(_("Bot \002%s\002 has been deleted."), nick.c_str());
		delete bi;
		return;
	}
 public:
	CommandBSBot(Module *creator) : Command(creator, "botserv/bot", 1, 6)
	{
		this->SetDesc(_("Maintains network bot list"));
		this->SetSyntax(_("\002ADD \037nick\037 \037user\037 \037host\037 \037real\037\002"));
		this->SetSyntax(_("\002CHANGE \037oldnick\037 \037newnick\037 [\037user\037 [\037host\037 [\037real\037]]]\002"));
		this->SetSyntax(_("\002DEL \037nick\037\002"));
	}

	void Execute(CommandSource &source, const std::vector<Anope::string> &params) anope_override
	{
		const Anope::string &cmd = params[0];

		if (Anope::ReadOnly)
		{
			source.Reply(_("Sorry, bot modification is temporarily disabled."));
			return;
		}

		if (cmd.equals_ci("ADD"))
		{
			// ADD nick user host real - 5
			if (!source.HasCommand("botserv/bot/add"))
			{
				source.Reply(ACCESS_DENIED);
				return;
			}

			if (params.size() < 5)
			{
				this->OnSyntaxError(source, "ADD");
				return;
			}

			std::vector<Anope::string> tempparams = params;
			// ADD takes less params than CHANGE, so we need to take 6 if given and append it with a space to 5.
			if (tempparams.size() >= 6)
				tempparams[4] = tempparams[4] + " " + tempparams[5];

			return this->DoAdd(source, tempparams);
		}
		else if (cmd.equals_ci("CHANGE"))
		{
			// CHANGE oldn newn user host real - 6
			// but only oldn and newn are required
			if (!source.HasCommand("botserv/bot/change"))
			{
				source.Reply(ACCESS_DENIED);
				return;
			}

			if (params.size() < 3)
			{
				this->OnSyntaxError(source, "CHANGE");
				return;
			}

			return this->DoChange(source, params);
		}
		else if (cmd.equals_ci("DEL"))
		{
			// DEL nick
			if (!source.HasCommand("botserv/bot/del"))
			{
				source.Reply(ACCESS_DENIED);
				return;
			}

			if (params.size() < 1)
			{
				this->OnSyntaxError(source, "DEL");
				return;
			}

			return this->DoDel(source, params);
		}
		else
			this->OnSyntaxError(source, "");

		return;
	}

	bool OnHelp(CommandSource &source, const Anope::string &subcommand) anope_override
	{
		this->SendSyntax(source);
		source.Reply(" ");
		source.Reply(_("Allows Services Operators to create, modify, and delete\n"
				"bots that users will be able to use on their own\n"
				"channels.\n"
				" \n"
				"\002BOT ADD\002 adds a bot with the given nickname, username,\n"
				"hostname and realname. Since no integrity checks are done\n"
				"for these settings, be really careful.\n"
				" \n"
				"\002BOT CHANGE\002 allows you to change the nickname, username, hostname\n"
				"or realname of a bot without deleting it (and\n"
				"all the data associated with it).\n"
				" \n"
				"\002BOT DEL\002 removes the given bot from the bot list.\n"
				" \n"
				"\002Note\002: You cannot create a bot with a nick that is\n"
				"currently registered. If an unregistered user is currently\n"
				"using the nick, they will be killed."));
		return true;
	}
};

class BSBot : public Module
{
	CommandBSBot commandbsbot;

 public:
	BSBot(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR),
		commandbsbot(this)
	{

	}
};

MODULE_INIT(BSBot)