/* ChanServ 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"

static Module *me;

class TempBan : public Timer
{
 private:
	Anope::string channel;
	Anope::string mask;
	Anope::string mode;

 public:
	TempBan(time_t seconds, Channel *c, const Anope::string &banmask, const Anope::string &mod) : Timer(me, seconds), channel(c->name), mask(banmask), mode(mod) { }

	void Tick(time_t ctime) anope_override
	{
		Channel *c = Channel::Find(this->channel);
		if (c)
			c->RemoveMode(NULL, mode, this->mask);
	}
};

class CommandCSBan : public Command
{
 public:
	CommandCSBan(Module *creator) : Command(creator, "chanserv/ban", 2, 4)
	{
		this->SetDesc(_("Bans a given nick or mask on a channel"));
		this->SetSyntax(_("\037channel\037 [+\037expiry\037] {\037nick\037 | \037mask\037} [\037reason\037]"));
	}

	void Execute(CommandSource &source, const std::vector<Anope::string> &params) anope_override
	{
		Configuration::Block *block = Config->GetCommand(source);
		const Anope::string &mode = block->Get<Anope::string>("mode", "BAN");
		ChannelMode *cm = ModeManager::FindChannelModeByName(mode);
		if (cm == NULL)
			return;

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

		Channel *c = ci->c;
		if (c == NULL)
		{
			source.Reply(CHAN_X_NOT_IN_USE, chan.c_str());
			return;
		}
		else if (IRCD->GetMaxListFor(c, cm) && c->HasMode(mode) >= IRCD->GetMaxListFor(c, cm))
		{
			source.Reply(_("The %s list for %s is full."), mode.lower().c_str(), c->name.c_str());
			return;
		}

		Anope::string expiry, target, reason;
		time_t ban_time;
		if (params[1][0] == '+')
		{
			ban_time = Anope::DoTime(params[1]);
			if (ban_time < 0)
			{
				source.Reply(BAD_EXPIRY_TIME);
				return;
			}
			if (params.size() < 3)
			{
				this->SendSyntax(source);
				return;
			}
			target = params[2];
			reason = "Requested";
			if (params.size() > 3)
				reason = params[3];
		}
		else
		{
			ban_time = 0;
			target = params[1];
			reason = "Requested";
			if (params.size() > 2)
				reason = params[2];
			if (params.size() > 3)
				reason += " " + params[3];
		}

		unsigned reasonmax = Config->GetModule("chanserv")->Get<unsigned>("reasonmax", "200");
		if (reason.length() > reasonmax)
			reason = reason.substr(0, reasonmax);

		Anope::string signkickformat = Config->GetModule("chanserv")->Get<Anope::string>("signkickformat", "%m (%n)");
		signkickformat = signkickformat.replace_all_cs("%n", source.GetNick());

		User *u = source.GetUser();
		User *u2 = User::Find(target, true);

		AccessGroup u_access = source.AccessFor(ci);

		if (!u_access.HasPriv("BAN") && !source.HasPriv("chanserv/kick"))
			source.Reply(ACCESS_DENIED);
		else if (u2)
		{
			AccessGroup u2_access = ci->AccessFor(u2);

			if (u != u2 && ci->HasExt("PEACE") && u2_access >= u_access && !source.HasPriv("chanserv/kick"))
				source.Reply(ACCESS_DENIED);
			/*
			 * Don't ban/kick the user on channels where he is excepted
			 * to prevent services <-> server wars.
			 */
			else if (c->MatchesList(u2, "EXCEPT"))
				source.Reply(CHAN_EXCEPTED, u2->nick.c_str(), ci->name.c_str());
			else if (u2->IsProtected())
				source.Reply(ACCESS_DENIED);
			else
			{
				Anope::string mask = ci->GetIdealBan(u2);

				bool override = !u_access.HasPriv("BAN") || (u != u2 && ci->HasExt("PEACE") && u2_access >= u_access);
				Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "for " << mask;

				if (!c->HasMode(mode, mask))
				{
					c->SetMode(NULL, mode, mask);
					if (ban_time)
					{
						new TempBan(ban_time, c, mask, mode);
						source.Reply(_("Ban on \002%s\002 expires in %s."), mask.c_str(), Anope::Duration(ban_time, source.GetAccount()).c_str());
					}
				}

				/* We still allow host banning while not allowing to kick */
				if (!c->FindUser(u2))
					return;

				if (block->Get<bool>("kick", "yes"))
				{
					if (ci->HasExt("SIGNKICK") || (ci->HasExt("SIGNKICK_LEVEL") && !source.AccessFor(ci).HasPriv("SIGNKICK")))
					{
						signkickformat = signkickformat.replace_all_cs("%m", reason);
						c->Kick(ci->WhoSends(), u2, "%s", signkickformat.c_str());
					}
					else
						c->Kick(ci->WhoSends(), u2, "%s", reason.c_str());
				}
			}
		}
		else
		{
			bool founder = u_access.HasPriv("FOUNDER");
			bool override = !founder && !u_access.HasPriv("BAN");

			Anope::string mask = IRCD->NormalizeMask(target);

			Log(override ? LOG_OVERRIDE : LOG_COMMAND, source, this, ci) << "for " << mask;

			if (!c->HasMode(mode, mask))
			{
				c->SetMode(NULL, mode, mask);
				if (ban_time)
				{
					new TempBan(ban_time, c, mask, mode);
					source.Reply(_("Ban on \002%s\002 expires in %s."), mask.c_str(), Anope::Duration(ban_time, source.GetAccount()).c_str());
				}
			}

			int matched = 0, kicked = 0;
			for (Channel::ChanUserList::iterator it = c->users.begin(), it_end = c->users.end(); it != it_end;)
			{
				ChanUserContainer *uc = it->second;
				++it;

				Entry e(mode, mask);
				if (e.Matches(uc->user))
				{
					++matched;

					AccessGroup u2_access = ci->AccessFor(uc->user);

					if (matched > 1 && !founder)
						continue;
					if (u != uc->user && ci->HasExt("PEACE") && u2_access >= u_access)
						continue;
					else if (ci->c->MatchesList(uc->user, "EXCEPT"))
						continue;
					else if (uc->user->IsProtected())
						continue;

					if (block->Get<bool>("kick", "yes"))
					{
						++kicked;
						if (ci->HasExt("SIGNKICK") || (ci->HasExt("SIGNKICK_LEVEL") && !u_access.HasPriv("SIGNKICK")))
						{
							reason += " (Matches " + mask + ")";
							signkickformat = signkickformat.replace_all_cs("%m", reason);
							c->Kick(ci->WhoSends(), uc->user, "%s", signkickformat.c_str());
						}
						else
							c->Kick(ci->WhoSends(), uc->user, "%s (Matches %s)", reason.c_str(), mask.c_str());
					}
				}
			}

			if (matched)
				source.Reply(_("Kicked %d/%d users matching %s from %s."), kicked, matched, mask.c_str(), c->name.c_str());
			else
				source.Reply(_("No users on %s match %s."), c->name.c_str(), mask.c_str());
		}
	}

	bool OnHelp(CommandSource &source, const Anope::string &subcommand) anope_override
	{
		this->SendSyntax(source);
		source.Reply(" ");
		source.Reply(_("Bans a given nick or mask on a channel. An optional expiry may\n"
				"be given to cause services to remove the ban after a set amount\n"
				"of time.\n"
				" \n"
				"By default, limited to AOPs or those with level 5 access\n"
				"and above on the channel. Channel founders may ban masks."));
		return true;
	}
};

class CSBan : public Module
{
	CommandCSBan commandcsban;

 public:
	CSBan(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR), commandcsban(this)
	{
		me = this;
	}
};

MODULE_INIT(CSBan)