/* ChanServ core functions
 *
 * (C) 2003-2020 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"

static std::map<Anope::string, int16_t, ci::less> defaultLevels;

static inline void reset_levels(ChannelInfo *ci)
{
	ci->ClearLevels();
	for (std::map<Anope::string, int16_t, ci::less>::iterator it = defaultLevels.begin(), it_end = defaultLevels.end(); it != it_end; ++it)
		ci->SetLevel(it->first, it->second);
}

class AccessChanAccess : public ChanAccess
{
 public:
	int level;

	AccessChanAccess(AccessProvider *p) : ChanAccess(p), level(0)
	{
	}

	bool HasPriv(const Anope::string &name) const anope_override
	{
		return this->ci->GetLevel(name) != ACCESS_INVALID && this->level >= this->ci->GetLevel(name);
	}

	Anope::string AccessSerialize() const
	{
		return stringify(this->level);
	}

	void AccessUnserialize(const Anope::string &data) anope_override
	{
		try
		{
			this->level = convertTo<int>(data);
		}
		catch (const ConvertException &)
		{
		}
	}

	bool operator>(const ChanAccess &other) const anope_override
	{
		if (this->provider != other.provider)
			return ChanAccess::operator>(other);
		else
			return this->level > anope_dynamic_static_cast<const AccessChanAccess *>(&other)->level;
	}

	bool operator<(const ChanAccess &other) const anope_override
	{
		if (this->provider != other.provider)
			return ChanAccess::operator<(other);
		else
			return this->level < anope_dynamic_static_cast<const AccessChanAccess *>(&other)->level;
	}
};

class AccessAccessProvider : public AccessProvider
{
 public:
	static AccessAccessProvider *me;

	AccessAccessProvider(Module *o) : AccessProvider(o, "access/access")
	{
		me = this;
	}

	ChanAccess *Create() anope_override
	{
		return new AccessChanAccess(this);
	}
};
AccessAccessProvider* AccessAccessProvider::me;

class CommandCSAccess : public Command
{
	void DoAdd(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		Anope::string mask = params[2];
		Privilege *p = NULL;
		int level = ACCESS_INVALID;

		try
		{
			level = convertTo<int>(params[3]);
		}
		catch (const ConvertException &)
		{
			p = PrivilegeManager::FindPrivilege(params[3]);
			if (p != NULL && defaultLevels[p->name])
				level = defaultLevels[p->name];
		}

		if (!level)
		{
			source.Reply(_("Access level must be non-zero."));
			return;
		}
		else if (level <= ACCESS_INVALID || level >= ACCESS_FOUNDER)
		{
			source.Reply(CHAN_ACCESS_LEVEL_RANGE, ACCESS_INVALID + 1, ACCESS_FOUNDER - 1);
			return;
		}

		AccessGroup u_access = source.AccessFor(ci);
		const ChanAccess *highest = u_access.Highest();

		AccessChanAccess tmp_access(AccessAccessProvider::me);
		tmp_access.ci = ci;
		tmp_access.level = level;

		bool override = false;
		const NickAlias *na = NULL;

		if ((!highest || *highest <= tmp_access) && !u_access.founder)
		{
			if (source.HasPriv("chanserv/access/modify"))
				override = true;
			else
			{
				source.Reply(ACCESS_DENIED);
				return;
			}
		}

		if (IRCD->IsChannelValid(mask))
		{
			if (Config->GetModule("chanserv")->Get<bool>("disallow_channel_access"))
			{
				source.Reply(_("Channels may not be on access lists."));
				return;
			}

			ChannelInfo *targ_ci = ChannelInfo::Find(mask);
			if (targ_ci == NULL)
			{
				source.Reply(CHAN_X_NOT_REGISTERED, mask.c_str());
				return;
			}
			else if (ci == targ_ci)
			{
				source.Reply(_("You can't add a channel to its own access list."));
				return;
			}

			mask = targ_ci->name;
		}
		else
		{
			na = NickAlias::Find(mask);

			if (!na && Config->GetModule("chanserv")->Get<bool>("disallow_hostmask_access"))
			{
				source.Reply(_("Masks and unregistered users may not be on access lists."));
				return;
			}
			else if (mask.find_first_of("!*@") == Anope::string::npos && !na)
			{
				User *targ = User::Find(mask, true);
				if (targ != NULL)
					mask = "*!*@" + targ->GetDisplayedHost();
				else
				{
					source.Reply(NICK_X_NOT_REGISTERED, mask.c_str());
					return;
				}
			}

			if (na)
				mask = na->nick;
		}

		for (unsigned i = ci->GetAccessCount(); i > 0; --i)
		{
			const ChanAccess *access = ci->GetAccess(i - 1);
			if ((na && na->nc == access->GetAccount()) || mask.equals_ci(access->Mask()))
			{
				/* Don't allow lowering from a level >= u_level */
				if ((!highest || *access >= *highest) && !u_access.founder && !source.HasPriv("chanserv/access/modify"))
				{
					source.Reply(ACCESS_DENIED);
					return;
				}
				delete ci->EraseAccess(i - 1);
				break;
			}
		}

		unsigned access_max = Config->GetModule("chanserv")->Get<unsigned>("accessmax", "1024");
		if (access_max && ci->GetDeepAccessCount() >= access_max)
		{
			source.Reply(_("Sorry, you can only have %d access entries on a channel, including access entries from other channels."), access_max);
			return;
		}

		ServiceReference<AccessProvider> provider("AccessProvider", "access/access");
		if (!provider)
			return;
		AccessChanAccess *access = anope_dynamic_static_cast<AccessChanAccess *>(provider->Create());
		access->SetMask(mask, ci);
		access->creator = source.GetNick();
		access->level = level;
		access->last_seen = 0;
		access->created = Anope::CurTime;
		ci->AddAccess(access);

		FOREACH_MOD(OnAccessAdd, (ci, source, access));

		Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to add " << mask << " with level " << level;
		if (p != NULL)
			source.Reply(_("\002%s\002 added to %s access list at privilege %s (level %d)"), access->Mask().c_str(), ci->name.c_str(), p->name.c_str(), level);
		else
			source.Reply(_("\002%s\002 added to %s access list at level \002%d\002."), access->Mask().c_str(), ci->name.c_str(), level);
	}

	void DoDel(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		Anope::string mask = params[2];

		if (!isdigit(mask[0]) && mask.find_first_of("#!*@") == Anope::string::npos && !NickAlias::Find(mask))
		{
			User *targ = User::Find(mask, true);
			if (targ != NULL)
				mask = "*!*@" + targ->GetDisplayedHost();
			else
			{
				source.Reply(NICK_X_NOT_REGISTERED, mask.c_str());
				return;
			}
		}

		if (!ci->GetAccessCount())
			source.Reply(_("%s access list is empty."), ci->name.c_str());
		else if (isdigit(mask[0]) && mask.find_first_not_of("1234567890,-") == Anope::string::npos)
		{
			class AccessDelCallback : public NumberList
			{
				CommandSource &source;
				ChannelInfo *ci;
				Command *c;
				unsigned deleted;
				Anope::string Nicks;
				bool denied;
				bool override;
			 public:
				AccessDelCallback(CommandSource &_source, ChannelInfo *_ci, Command *_c, const Anope::string &numlist) : NumberList(numlist, true), source(_source), ci(_ci), c(_c), deleted(0), denied(false), override(false)
				{
					if (!source.AccessFor(ci).HasPriv("ACCESS_CHANGE") && source.HasPriv("chanserv/access/modify"))
						this->override = true;
				}

				~AccessDelCallback()
				{
					if (denied && !deleted)
						source.Reply(ACCESS_DENIED);
					else if (!deleted)
						source.Reply(_("No matching entries on %s access list."), ci->name.c_str());
					else
					{
						Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, c, ci) << "to delete " << Nicks;

						if (deleted == 1)
							source.Reply(_("Deleted 1 entry from %s access list."), ci->name.c_str());
						else
							source.Reply(_("Deleted %d entries from %s access list."), deleted, ci->name.c_str());
					}
				}

				void HandleNumber(unsigned Number) anope_override
				{
					if (!Number || Number > ci->GetAccessCount())
						return;

					ChanAccess *access = ci->GetAccess(Number - 1);

					AccessGroup ag = source.AccessFor(ci);
					const ChanAccess *u_highest = ag.Highest();

					if ((!u_highest || *u_highest <= *access) && !ag.founder && !this->override && access->GetAccount() != source.nc)
					{
						denied = true;
						return;
					}

					++deleted;
					if (!Nicks.empty())
						Nicks += ", " + access->Mask();
					else
						Nicks = access->Mask();

					ci->EraseAccess(Number - 1);

					FOREACH_MOD(OnAccessDel, (ci, source, access));
					delete access;
				}
			}
			delcallback(source, ci, this, mask);
			delcallback.Process();
		}
		else
		{
			AccessGroup u_access = source.AccessFor(ci);
			const ChanAccess *highest = u_access.Highest();

			for (unsigned i = ci->GetAccessCount(); i > 0; --i)
			{
				ChanAccess *access = ci->GetAccess(i - 1);
				if (mask.equals_ci(access->Mask()))
				{
					if (access->GetAccount() != source.nc && !u_access.founder && (!highest || *highest <= *access) && !source.HasPriv("chanserv/access/modify"))
						source.Reply(ACCESS_DENIED);
					else
					{
						source.Reply(_("\002%s\002 deleted from %s access list."), access->Mask().c_str(), ci->name.c_str());
						bool override = !u_access.founder && !u_access.HasPriv("ACCESS_CHANGE") && access->GetAccount() != source.nc;
						Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to delete " << access->Mask();

						ci->EraseAccess(i - 1);
						FOREACH_MOD(OnAccessDel, (ci, source, access));
						delete access;
					}
					return;
				}
			}

			source.Reply(_("\002%s\002 not found on %s access list."), mask.c_str(), ci->name.c_str());
		}

		return;
	}

	void ProcessList(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params, ListFormatter &list)
	{
		const Anope::string &nick = params.size() > 2 ? params[2] : "";

		if (!ci->GetAccessCount())
			source.Reply(_("%s access list is empty."), ci->name.c_str());
		else if (!nick.empty() && nick.find_first_not_of("1234567890,-") == Anope::string::npos)
		{
			class AccessListCallback : public NumberList
			{
				ListFormatter &list;
				ChannelInfo *ci;

			 public:
				AccessListCallback(ListFormatter &_list, ChannelInfo *_ci, const Anope::string &numlist) : NumberList(numlist, false), list(_list), ci(_ci)
				{
				}

				void HandleNumber(unsigned number) anope_override
				{
					if (!number || number > ci->GetAccessCount())
						return;

					const ChanAccess *access = ci->GetAccess(number - 1);

					Anope::string timebuf;
					if (ci->c)
						for (Channel::ChanUserList::const_iterator cit = ci->c->users.begin(), cit_end = ci->c->users.end(); cit != cit_end; ++cit)
						{
							ChannelInfo *p;
							if (access->Matches(cit->second->user, cit->second->user->Account(), p))
								timebuf = "Now";
						}
					if (timebuf.empty())
					{
						if (access->last_seen == 0)
							timebuf = "Never";
						else
							timebuf = Anope::strftime(access->last_seen, NULL, true);
					}

					ListFormatter::ListEntry entry;
					entry["Number"] = stringify(number);
					entry["Level"] = access->AccessSerialize();
					entry["Mask"] = access->Mask();
					entry["By"] = access->creator;
					entry["Last seen"] = timebuf;
					this->list.AddEntry(entry);
				}
			}
			nl_list(list, ci, nick);
			nl_list.Process();
		}
		else
		{
			for (unsigned i = 0, end = ci->GetAccessCount(); i < end; ++i)
			{
				const ChanAccess *access = ci->GetAccess(i);

				if (!nick.empty() && !Anope::Match(access->Mask(), nick))
					continue;

				Anope::string timebuf;
				if (ci->c)
					for (Channel::ChanUserList::const_iterator cit = ci->c->users.begin(), cit_end = ci->c->users.end(); cit != cit_end; ++cit)
					{
						ChannelInfo *p;
						if (access->Matches(cit->second->user, cit->second->user->Account(), p))
							timebuf = "Now";
					}
				if (timebuf.empty())
				{
					if (access->last_seen == 0)
						timebuf = "Never";
					else
						timebuf = Anope::strftime(access->last_seen, NULL, true);
				}

				ListFormatter::ListEntry entry;
				entry["Number"] = stringify(i + 1);
				entry["Level"] = access->AccessSerialize();
				entry["Mask"] = access->Mask();
				entry["By"] = access->creator;
				entry["Last seen"] = timebuf;
				list.AddEntry(entry);
			}
		}

		if (list.IsEmpty())
			source.Reply(_("No matching entries on %s access list."), ci->name.c_str());
		else
		{
			std::vector<Anope::string> replies;
			list.Process(replies);

			source.Reply(_("Access list for %s:"), ci->name.c_str());

			for (unsigned i = 0; i < replies.size(); ++i)
				source.Reply(replies[i]);

			source.Reply(_("End of access list"));
		}

		return;
	}

	void DoList(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		if (!ci->GetAccessCount())
		{
			source.Reply(_("%s access list is empty."), ci->name.c_str());
			return;
		}

		ListFormatter list(source.GetAccount());
		list.AddColumn(_("Number")).AddColumn(_("Level")).AddColumn(_("Mask"));
		this->ProcessList(source, ci, params, list);
	}

	void DoView(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		if (!ci->GetAccessCount())
		{
			source.Reply(_("%s access list is empty."), ci->name.c_str());
			return;
		}

		ListFormatter list(source.GetAccount());
		list.AddColumn(_("Number")).AddColumn(_("Level")).AddColumn(_("Mask")).AddColumn(_("By")).AddColumn(_("Last seen"));
		this->ProcessList(source, ci, params, list);
	}

	void DoClear(CommandSource &source, ChannelInfo *ci)
	{
		if (!source.IsFounder(ci) && !source.HasPriv("chanserv/access/modify"))
			source.Reply(ACCESS_DENIED);
		else
		{
			FOREACH_MOD(OnAccessClear, (ci, source));

			ci->ClearAccess();

			source.Reply(_("Channel %s access list has been cleared."), ci->name.c_str());

			bool override = !source.IsFounder(ci);
			Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to clear the access list";
		}

		return;
	}

 public:
	CommandCSAccess(Module *creator) : Command(creator, "chanserv/access", 2, 4)
	{
		this->SetDesc(_("Modify the list of privileged users"));
		this->SetSyntax(_("\037channel\037 ADD \037mask\037 \037level\037"));
		this->SetSyntax(_("\037channel\037 DEL {\037mask\037 | \037entry-num\037 | \037list\037}"));
		this->SetSyntax(_("\037channel\037 LIST [\037mask\037 | \037list\037]"));
		this->SetSyntax(_("\037channel\037 VIEW [\037mask\037 | \037list\037]"));
		this->SetSyntax(_("\037channel\037 CLEAR"));
	}

	void Execute(CommandSource &source, const std::vector<Anope::string> &params) anope_override
	{
		const Anope::string &cmd = params[1];
		const Anope::string &nick = params.size() > 2 ? params[2] : "";
		const Anope::string &s = params.size() > 3 ? params[3] : "";

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

		bool is_list = cmd.equals_ci("LIST") || cmd.equals_ci("VIEW");
		bool is_clear = cmd.equals_ci("CLEAR");
		bool is_del = cmd.equals_ci("DEL");

		bool has_access = false;
		if (source.HasPriv("chanserv/access/modify"))
			has_access = true;
		else if (is_list && source.HasPriv("chanserv/access/list"))
			has_access = true;
		else if (is_list && source.AccessFor(ci).HasPriv("ACCESS_LIST"))
			has_access = true;
		else if (source.AccessFor(ci).HasPriv("ACCESS_CHANGE"))
			has_access = true;
		else if (is_del)
		{
			const NickAlias *na = NickAlias::Find(nick);
			if (na && na->nc == source.GetAccount())
				has_access = true;
		}

		/* If LIST, we don't *require* any parameters, but we can take any.
		 * If DEL, we require a nick and no level.
		 * Else (ADD), we require a level (which implies a nick). */
		if (is_list || is_clear ? 0 : (cmd.equals_ci("DEL") ? (nick.empty() || !s.empty()) : s.empty()))
			this->OnSyntaxError(source, cmd);
		else if (!has_access)
			source.Reply(ACCESS_DENIED);
		else if (Anope::ReadOnly && !is_list)
			source.Reply(_("Sorry, channel access list modification is temporarily disabled."));
		else if (cmd.equals_ci("ADD"))
			this->DoAdd(source, ci, params);
		else if (cmd.equals_ci("DEL"))
			this->DoDel(source, ci, params);
		else if (cmd.equals_ci("LIST"))
			this->DoList(source, ci, params);
		else if (cmd.equals_ci("VIEW"))
			this->DoView(source, ci, params);
		else if (cmd.equals_ci("CLEAR"))
			this->DoClear(source, ci);
		else
			this->OnSyntaxError(source, "");

		return;
	}

	bool OnHelp(CommandSource &source, const Anope::string &subcommand) anope_override
	{
		this->SendSyntax(source);
		source.Reply(" ");
		source.Reply(_("Maintains the \002access list\002 for a channel.  The access\n"
				"list specifies which users are allowed chanop status or\n"
				"access to %s commands on the channel.  Different\n"
				"user levels allow for access to different subsets of\n"
				"privileges. Any registered user not on the access list has\n"
				"a user level of 0, and any unregistered user has a user level\n"
				"of -1."), source.service->nick.c_str());
		source.Reply(" ");
		source.Reply(_("The \002ACCESS ADD\002 command adds the given mask to the\n"
				"access list with the given user level; if the mask is\n"
				"already present on the list, its access level is changed to\n"
				"the level specified in the command.  The \037level\037 specified\n"
				"may be a numerical level or the name of a privilege (eg AUTOOP).\n"
				"When a user joins the channel the access they receive is from the\n"
				"highest level entry in the access list."));
		if (!Config->GetModule("chanserv")->Get<bool>("disallow_channel_access"))
			source.Reply(_("The given mask may also be a channel, which will use the\n"
					"access list from the other channel up to the given \037level\037."));
		source.Reply(" ");
		source.Reply(_("The \002ACCESS DEL\002 command removes the given nick from the\n"
				"access list.  If a list of entry numbers is given, those\n"
				"entries are deleted.  (See the example for LIST below.)\n"
				"You may remove yourself from an access list, even if you\n"
				"do not have access to modify that list otherwise."));
		source.Reply(" ");
		source.Reply(_("The \002ACCESS LIST\002 command displays the access list.  If\n"
				"a wildcard mask is given, only those entries matching the\n"
				"mask are displayed.  If a list of entry numbers is given,\n"
				"only those entries are shown; for example:\n"
				"   \002ACCESS #channel LIST 2-5,7-9\002\n"
				"      Lists access entries numbered 2 through 5 and\n"
				"      7 through 9.\n"
				" \n"
				"The \002ACCESS VIEW\002 command displays the access list similar\n"
				"to \002ACCESS LIST\002 but shows the creator and last used time.\n"
				" \n"
				"The \002ACCESS CLEAR\002 command clears all entries of the\n"
				"access list."));
		source.Reply(" ");

		BotInfo *bi;
		Anope::string cmd;
		if (Command::FindCommandFromService("chanserv/levels", bi, cmd))
			source.Reply(_("\002User access levels\002 can be seen by using the\n"
					"\002%s\002 command; type \002%s%s HELP LEVELS\002 for\n"
					"information."), cmd.c_str(), Config->StrictPrivmsg.c_str(), bi->nick.c_str());
		return true;
	}
};

class CommandCSLevels : public Command
{
	void DoSet(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		const Anope::string &what = params[2];
		const Anope::string &lev = params[3];

		int level;

		if (lev.equals_ci("FOUNDER"))
			level = ACCESS_FOUNDER;
		else
		{
			try
			{
				level = convertTo<int>(lev);
			}
			catch (const ConvertException &)
			{
				this->OnSyntaxError(source, "SET");
				return;
			}
		}

		if (level <= ACCESS_INVALID || level > ACCESS_FOUNDER)
			source.Reply(_("Level must be between %d and %d inclusive."), ACCESS_INVALID + 1, ACCESS_FOUNDER - 1);
		else
		{
			Privilege *p = PrivilegeManager::FindPrivilege(what);
			if (p == NULL)
				source.Reply(_("Setting \002%s\002 not known.  Type \002%s%s HELP LEVELS\002 for a list of valid settings."), what.c_str(), Config->StrictPrivmsg.c_str(), source.service->nick.c_str());
			else
			{
				bool override = !source.AccessFor(ci).HasPriv("FOUNDER");
				Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to set " << p->name << " to level " << level;

				ci->SetLevel(p->name, level);
				FOREACH_MOD(OnLevelChange, (source, ci, p->name, level));

				if (level == ACCESS_FOUNDER)
					source.Reply(_("Level for %s on channel %s changed to founder only."), p->name.c_str(), ci->name.c_str());
				else
					source.Reply(_("Level for \002%s\002 on channel %s changed to \002%d\002."), p->name.c_str(), ci->name.c_str(), level);
			}
		}
	}

	void DoDisable(CommandSource &source, ChannelInfo *ci, const std::vector<Anope::string> &params)
	{
		const Anope::string &what = params[2];

		/* Don't allow disabling of the founder level. It would be hard to change it back if you don't have access to use this command */
		if (what.equals_ci("FOUNDER"))
		{
			source.Reply(_("You can not disable the founder privilege because it would be impossible to reenable it at a later time."));
			return;
		}

		Privilege *p = PrivilegeManager::FindPrivilege(what);
		if (p != NULL)
		{
			bool override = !source.AccessFor(ci).HasPriv("FOUNDER");
			Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to disable " << p->name;

			ci->SetLevel(p->name, ACCESS_INVALID);
			FOREACH_MOD(OnLevelChange, (source, ci, p->name, ACCESS_INVALID));

			source.Reply(_("\002%s\002 disabled on channel %s."), p->name.c_str(), ci->name.c_str());
			return;
		}

		source.Reply(_("Setting \002%s\002 not known.  Type \002%s%s HELP LEVELS\002 for a list of valid settings."), what.c_str(), Config->StrictPrivmsg.c_str(), source.service->nick.c_str());
	}

	void DoList(CommandSource &source, ChannelInfo *ci)
	{
		source.Reply(_("Access level settings for channel %s:"), ci->name.c_str());

		ListFormatter list(source.GetAccount());
		list.AddColumn(_("Name")).AddColumn(_("Level"));

		const std::vector<Privilege> &privs = PrivilegeManager::GetPrivileges();

		for (unsigned i = 0; i < privs.size(); ++i)
		{
			const Privilege &p = privs[i];
			int16_t j = ci->GetLevel(p.name);

			ListFormatter::ListEntry entry;
			entry["Name"] = p.name;

			if (j == ACCESS_INVALID)
				entry["Level"] = Language::Translate(source.GetAccount(), _("(disabled)"));
			else if (j == ACCESS_FOUNDER)
				entry["Level"] = Language::Translate(source.GetAccount(), _("(founder only)"));
			else
				entry["Level"] = stringify(j);

			list.AddEntry(entry);
		}

		std::vector<Anope::string> replies;
		list.Process(replies);

		for (unsigned i = 0; i < replies.size(); ++i)
			source.Reply(replies[i]);
	}

	void DoReset(CommandSource &source, ChannelInfo *ci)
	{
		bool override = !source.AccessFor(ci).HasPriv("FOUNDER");
		Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "to reset all levels";

		reset_levels(ci);
		FOREACH_MOD(OnLevelChange, (source, ci, "ALL", 0));

		source.Reply(_("Access levels for \002%s\002 reset to defaults."), ci->name.c_str());
		return;
	}

 public:
	CommandCSLevels(Module *creator) : Command(creator, "chanserv/levels", 2, 4)
	{
		this->SetDesc(_("Redefine the meanings of access levels"));
		this->SetSyntax(_("\037channel\037 SET \037type\037 \037level\037"));
		this->SetSyntax(_("\037channel\037 {DIS | DISABLE} \037type\037"));
		this->SetSyntax(_("\037channel\037 LIST"));
		this->SetSyntax(_("\037channel\037 RESET"));
	}

	void Execute(CommandSource &source, const std::vector<Anope::string> &params) anope_override
	{
		const Anope::string &cmd = params[1];
		const Anope::string &what = params.size() > 2 ? params[2] : "";
		const Anope::string &s = params.size() > 3 ? params[3] : "";

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

		bool has_access = false;
		if (source.HasPriv("chanserv/access/modify"))
			has_access = true;
		else if (cmd.equals_ci("LIST") && source.HasPriv("chanserv/access/list"))
			has_access = true;
		else if (source.AccessFor(ci).HasPriv("FOUNDER"))
			has_access = true;

		/* If SET, we want two extra parameters; if DIS[ABLE] or FOUNDER, we want only
		 * one; else, we want none.
		 */
		if (cmd.equals_ci("SET") ? s.empty() : (cmd.substr(0, 3).equals_ci("DIS") ? (what.empty() || !s.empty()) : !what.empty()))
			this->OnSyntaxError(source, cmd);
		else if (!has_access)
			source.Reply(ACCESS_DENIED);
		else if (Anope::ReadOnly && !cmd.equals_ci("LIST"))
			source.Reply(READ_ONLY_MODE);
		else if (cmd.equals_ci("SET"))
			this->DoSet(source, ci, params);
		else if (cmd.equals_ci("DIS") || cmd.equals_ci("DISABLE"))
			this->DoDisable(source, ci, params);
		else if (cmd.equals_ci("LIST"))
			this->DoList(source, ci);
		else if (cmd.equals_ci("RESET"))
			this->DoReset(source, ci);
		else
			this->OnSyntaxError(source, "");

		return;
	}

	bool OnHelp(CommandSource &source, const Anope::string &subcommand) anope_override
	{
		if (subcommand.equals_ci("DESC"))
		{
			source.Reply(_("The following feature/function names are available:"));

			ListFormatter list(source.GetAccount());
			list.AddColumn(_("Name")).AddColumn(_("Description"));

			const std::vector<Privilege> &privs = PrivilegeManager::GetPrivileges();
			for (unsigned i = 0; i < privs.size(); ++i)
			{
				const Privilege &p = privs[i];
				ListFormatter::ListEntry entry;
				entry["Name"] = p.name;
				entry["Description"] = Language::Translate(source.nc, p.desc.c_str());
				list.AddEntry(entry);
			}

			std::vector<Anope::string> replies;
			list.Process(replies);

			for (unsigned i = 0; i < replies.size(); ++i)
				source.Reply(replies[i]);
		}
		else
		{
			this->SendSyntax(source);
			source.Reply(" ");
			source.Reply(_("The \002LEVELS\002 command allows fine control over the meaning of\n"
					"the numeric access levels used for channels.  With this\n"
					"command, you can define the access level required for most\n"
					"of %s's functions. (The \002SET FOUNDER\002 and this command\n"
					"are always restricted to the channel founder.)\n"
					" \n"
					"\002LEVELS SET\002 allows the access level for a function or group of\n"
					"functions to be changed. \002LEVELS DISABLE\002 (or \002DIS\002 for short)\n"
					"disables an automatic feature or disallows access to a\n"
					"function by anyone, INCLUDING the founder (although, the founder\n"
					"can always reenable it). Use \002LEVELS SET founder\002 to make a level\n"
					"founder only.\n"
					" \n"
					"\002LEVELS LIST\002 shows the current levels for each function or\n"
					"group of functions. \002LEVELS RESET\002 resets the levels to the\n"
					"default levels of a newly-created channel.\n"
					" \n"
					"For a list of the features and functions whose levels can be\n"
					"set, see \002HELP LEVELS DESC\002."), source.service->nick.c_str());
		}
		return true;
	}
};

class CSAccess : public Module
{
	AccessAccessProvider accessprovider;
	CommandCSAccess commandcsaccess;
	CommandCSLevels commandcslevels;

 public:
	CSAccess(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR),
		accessprovider(this), commandcsaccess(this), commandcslevels(this)
	{
		this->SetPermanent(true);

	}

	void OnReload(Configuration::Conf *conf) anope_override
	{
		defaultLevels.clear();

		for (int i = 0; i < conf->CountBlock("privilege"); ++i)
		{
			Configuration::Block *priv = conf->GetBlock("privilege", i);

			const Anope::string &pname = priv->Get<const Anope::string>("name");

			Privilege *p = PrivilegeManager::FindPrivilege(pname);
			if (p == NULL)
				continue;

			const Anope::string &value = priv->Get<const Anope::string>("level");
			if (value.empty())
				continue;
			else if (value.equals_ci("founder"))
				defaultLevels[p->name] = ACCESS_FOUNDER;
			else if (value.equals_ci("disabled"))
				defaultLevels[p->name] = ACCESS_INVALID;
			else
				defaultLevels[p->name] = priv->Get<int16_t>("level");
		}
	}

	void OnCreateChan(ChannelInfo *ci) anope_override
	{
		reset_levels(ci);
	}

	EventReturn OnGroupCheckPriv(const AccessGroup *group, const Anope::string &priv) anope_override
	{
		if (group->ci == NULL)
			return EVENT_CONTINUE;

		const ChanAccess *highest = group->Highest();
		if (highest && highest->provider == &accessprovider)
		{
			/* Access accessprovider is the only accessprovider with the concept of negative access,
			 * so check they don't have negative access
			 */
			const AccessChanAccess *aca = anope_dynamic_static_cast<const AccessChanAccess *>(highest);

			if (aca->level < 0)
				return EVENT_CONTINUE;
		}

		/* Special case. Allows a level of -1 to match anyone, and a level of 0 to match anyone identified. */
		int16_t level = group->ci->GetLevel(priv);
		if (level == -1)
			return EVENT_ALLOW;
		else if (level == 0 && group->nc)
			return EVENT_ALLOW;
		return EVENT_CONTINUE;
	}
};

MODULE_INIT(CSAccess)
