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/* Fantasy functionality
 *
 * (C) 2003-2024 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 CommandBSSetFantasy : public Command
{
 public:
	CommandBSSetFantasy(Module *creator, const Anope::string &sname = "botserv/set/fantasy") : Command(creator, sname, 2, 2)
	{
		this->SetDesc(_("Enable fantaisist commands"));
		this->SetSyntax(_("\037channel\037 {\037ON|OFF\037}"));
	}

	void Execute(CommandSource &source, const std::vector<Anope::string> &params) anope_override
	{
		ChannelInfo *ci = ChannelInfo::Find(params[0]);
		const Anope::string &value = params[1];

		if (ci == NULL)
		{
			source.Reply(CHAN_X_NOT_REGISTERED, params[0].c_str());
			return;
		}

		if (!source.HasPriv("botserv/administration") && !source.AccessFor(ci).HasPriv("SET"))
		{
			source.Reply(ACCESS_DENIED);
			return;
		}

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

		if (value.equals_ci("ON"))
		{
			bool override = !source.AccessFor(ci).HasPriv("SET");
			Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to enable fantasy";

			ci->Extend<bool>("BS_FANTASY");
			source.Reply(_("Fantasy mode is now \002on\002 on channel %s."), ci->name.c_str());
		}
		else if (value.equals_ci("OFF"))
		{
			bool override = !source.AccessFor(ci).HasPriv("SET");
			Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to disable fantasy";

			ci->Shrink<bool>("BS_FANTASY");
			source.Reply(_("Fantasy mode is now \002off\002 on channel %s."), ci->name.c_str());
		}
		else
			this->OnSyntaxError(source, source.command);
	}

	bool OnHelp(CommandSource &source, const Anope::string &) anope_override
	{
		this->SendSyntax(source);
		source.Reply(_(" \n"
				"Enables or disables \002fantasy\002 mode on a channel.\n"
				"When it is enabled, users will be able to use\n"
				"fantasy commands on a channel when prefixed\n"
				"with one of the following fantasy characters: \002%s\002\n"
				" \n"
				"Note that users wanting to use fantaisist\n"
				"commands MUST have enough access for both\n"
				"the FANTASIA and the command they are executing."),
				Config->GetModule(this->owner)->Get<const Anope::string>("fantasycharacter", "!").c_str());
		return true;
	}
};

class Fantasy : public Module
{
	SerializableExtensibleItem<bool> fantasy;

	CommandBSSetFantasy commandbssetfantasy;

 public:
	Fantasy(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR),
		fantasy(this, "BS_FANTASY"), commandbssetfantasy(this)
	{
	}

	void OnPrivmsg(User *u, Channel *c, Anope::string &msg) anope_override
	{
		if (!u || !c || !c->ci || !c->ci->bi || msg.empty() || msg[0] == '\1')
			return;

		if (Config->GetClient("BotServ") && !fantasy.HasExt(c->ci))
			return;

		std::vector<Anope::string> params;
		spacesepstream(msg).GetTokens(params);

		if (params.empty())
			return;

		Anope::string normalized_param0 = Anope::NormalizeBuffer(params[0]);
		Anope::string fantasy_chars = Config->GetModule(this)->Get<Anope::string>("fantasycharacter", "!");

		if (!normalized_param0.find(c->ci->bi->nick))
		{
			params.erase(params.begin());
		}
		else if (!normalized_param0.find_first_of(fantasy_chars))
		{
			size_t sz = params[0].find_first_of(fantasy_chars);
			if (sz == Anope::string::npos)
				return; /* normalized_param0 is a subset of params[0] so this can't happen */

			params[0].erase(0, sz + 1);
		}
		else
		{
			return;
		}

		if (params.empty())
			return;

		CommandInfo::map::const_iterator it = Config->Fantasy.end();
		unsigned count = 0;
		for (unsigned max = params.size(); it == Config->Fantasy.end() && max > 0; --max)
		{
			Anope::string full_command;
			for (unsigned i = 0; i < max; ++i)
				full_command += " " + params[i];
			full_command.erase(full_command.begin());

			++count;
			it = Config->Fantasy.find(Anope::NormalizeBuffer(full_command));
		}

		if (it == Config->Fantasy.end())
			return;

		const CommandInfo &info = it->second;
		ServiceReference<Command> cmd("Command", info.name);
		if (!cmd)
		{
			Log(LOG_DEBUG) << "Fantasy command " << it->first << " exists for nonexistent service " << info.name << "!";
			return;
		}

		for (unsigned i = 0, j = params.size() - (count - 1); i < j; ++i)
			params.erase(params.begin());

		/* Some commands take the channel as a first parameter */
		if (info.prepend_channel)
			params.insert(params.begin(), c->name);

		while (cmd->max_params > 0 && params.size() > cmd->max_params)
		{
			params[cmd->max_params - 1] += " " + params[cmd->max_params];
			params.erase(params.begin() + cmd->max_params);
		}

		// Command requires registered users only
		if (!cmd->AllowUnregistered() && !u->Account())
			return;

		if (params.size() < cmd->min_params)
			return;

		CommandSource source(u->nick, u, u->Account(), u, c->ci->bi);
		source.c = c;
		source.command = it->first;
		source.permission = info.permission;

		AccessGroup ag = c->ci->AccessFor(u);
		bool has_fantasia = ag.HasPriv("FANTASIA") || source.HasPriv("botserv/fantasy");

		EventReturn MOD_RESULT;
		if (has_fantasia)
		{
			FOREACH_RESULT(OnBotFantasy, MOD_RESULT, (source, cmd, c->ci, params));
		}
		else
		{
			FOREACH_RESULT(OnBotNoFantasyAccess, MOD_RESULT, (source, cmd, c->ci, params));
		}

		if (MOD_RESULT == EVENT_STOP || !has_fantasia)
			return;

		if (MOD_RESULT != EVENT_ALLOW && !info.permission.empty() && !source.HasCommand(info.permission))
			return;

		FOREACH_RESULT(OnPreCommand, MOD_RESULT, (source, cmd, params));
		if (MOD_RESULT == EVENT_STOP)
			return;

		Reference<NickCore> nc_reference(u->Account());
		cmd->Execute(source, params);
		if (!nc_reference)
			source.nc = NULL;
		FOREACH_MOD(OnPostCommand, (source, cmd, params));
	}

	void OnBotInfo(CommandSource &source, BotInfo *bi, ChannelInfo *ci, InfoFormatter &info) anope_override
	{
		if (fantasy.HasExt(ci))
			info.AddOption(_("Fantasy"));
	}
};

MODULE_INIT(Fantasy)