/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_kick.c: Kicks a user from a channel.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox development team
 *
 *  This program 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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 */

#include "stdinc.h"
#include "channel.h"
#include "client.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "msg.h"
#include "modules.h"
#include "parse.h"
#include "hash.h"
#include "packet.h"
#include "s_serv.h"
#include "s_conf.h"
#include "hook.h"

static int m_kick(struct Client *, struct Client *, int, const char **);
#define mg_kick { m_kick, 3 }

struct Message kick_msgtab = {
	"KICK", 0, 0, 0, MFLG_SLOW,
	{mg_unreg, mg_kick, mg_kick, mg_kick, mg_ignore, mg_kick}
};

mapi_clist_av1 kick_clist[] = { &kick_msgtab, NULL };

DECLARE_MODULE_AV1(kick, NULL, NULL, kick_clist, NULL, NULL, "$Revision: 3317 $");

/*
** m_kick
**      parv[1] = channel
**      parv[2] = client to kick
**      parv[3] = kick comment
*/
static int
m_kick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
	struct membership *msptr;
	struct Client *who;
	struct Channel *chptr;
	int chasing = 0;
	char *comment;
	const char *name;
	char *p = NULL;
	char text[10];
	const char *user;
	static char buf[BUFSIZE];
	int is_override = 0;

	if(MyClient(source_p) && !IsFloodDone(source_p))
		flood_endgrace(source_p);

	*buf = '\0';
	if((p = strchr(parv[1], ',')))
		*p = '\0';

	name = parv[1];

	chptr = find_channel(name);
	if(chptr == NULL)
	{
		sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
		return 0;
	}

	user = parv[2];		/* strtoken(&p2, parv[2], ","); */

	if(!(who = find_chasing(source_p, user, &chasing)))
	{
		return 0;
	}

	if(!IsServer(source_p))
	{
		msptr = find_channel_membership(chptr, source_p);

		if((msptr == NULL) && MyConnect(source_p))
		{
			sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
					   form_str(ERR_NOTONCHANNEL), name);
			return 0;
		}

		if(!can_kick_deop(msptr, find_channel_membership(chptr, who)))
		{
			if(MyConnect(source_p))
			{
				if(IsOverride(source_p))
					is_override = 1;
				else
				{
					sendto_one(source_p, ":%s 482 %s %s :You do not have the proper privledges to kick this user",
							me.name, source_p->name, name);
					return 0;
				}
			}

			/* If its a TS 0 channel, do it the old way */
			else if(chptr->channelts == 0)
			{
				sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
					   get_id(&me, source_p), get_id(source_p, source_p), name);
				return 0;
			}
		}

		/* Its a user doing a kick, but is not showing as chanop locally
		 * its also not a user ON -my- server, and the channel has a TS.
		 * There are two cases we can get to this point then...
		 *
		 *     1) connect burst is happening, and for some reason a legit
		 *        op has sent a KICK, but the SJOIN hasn't happened yet or 
		 *        been seen. (who knows.. due to lag...)
		 *
		 *     2) The channel is desynced. That can STILL happen with TS
		 *        
		 *     Now, the old code roger wrote, would allow the KICK to 
		 *     go through. Thats quite legit, but lets weird things like
		 *     KICKS by users who appear not to be chanopped happen,
		 *     or even neater, they appear not to be on the channel.
		 *     This fits every definition of a desync, doesn't it? ;-)
		 *     So I will allow the KICK, otherwise, things are MUCH worse.
		 *     But I will warn it as a possible desync.
		 *
		 *     -Dianora
		 */
	}

	if((p = strchr(parv[2], ',')))
		*p = '\0';

	msptr = find_channel_membership(chptr, who);

	if(msptr != NULL)
	{
		if(MyClient(source_p) && IsService(who))
		{
			sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
				   me.name, source_p->name, who->name, chptr->chname);
			return 0;
		}

		if(MyClient(source_p) && chptr->mode.mode & MODE_NOKICK)
		{
			sendto_one_numeric(source_p, ERR_NOKICK,
					form_str(ERR_NOKICK),
					chptr->chname);
			return 0;
		}

		if (MyClient(source_p) && chptr->mode.mode & MODE_NOOPERKICK && IsOper(who))
		{
			sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
					"Overriding KICK from %s on %s in %s (channel is +M)",
					source_p->name, who->name, chptr->chname);
			sendto_one_numeric(source_p, ERR_ISCHANSERVICE,
					"%s %s :Cannot kick IRC operators from that channel.",
					who->name, chptr->chname);
			return 0;
		}

		if(MyClient(source_p))
		{
			hook_data_channel_approval hookdata;

			hookdata.client = source_p;
			hookdata.chptr = chptr;
			hookdata.target = who;
			hookdata.approved = 1;

			call_hook(h_can_kick, &hookdata);

			if (!hookdata.approved)
				return 0;
		}

		comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
		if(strlen(comment) > (size_t) REASONLEN)
			comment[REASONLEN] = '\0';

		if(is_override)
		{
			sendto_wallops_flags(UMODE_WALLOP, &me,
					"%s is overriding KICK [%s] on [%s] [%s]",
					get_oper_name(source_p), who->name, chptr->chname, comment);
			sendto_server(NULL, chptr, NOCAPS, NOCAPS,
					":%s WALLOPS :%s is overriding KICK [%s] on [%s] [%s]",
					me.name, get_oper_name(source_p), who->name, chptr->chname, comment);
		}

		/* jdc
		 * - In the case of a server kicking a user (i.e. CLEARCHAN),
		 *   the kick should show up as coming from the server which did
		 *   the kick.
		 * - Personally, flame and I believe that server kicks shouldn't
		 *   be sent anyways.  Just waiting for some oper to abuse it...
		 */
		if(IsServer(source_p))
			sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
					     source_p->name, name, who->name, comment);
		else
			sendto_channel_local(ALL_MEMBERS, chptr,
					     ":%s!%s@%s KICK %s %s :%s",
					     source_p->name, source_p->username,
					     source_p->host, name, who->name, comment);

		sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
			      ":%s KICK %s %s :%s",
			      use_id(source_p), chptr->chname, use_id(who), comment);
		remove_user_from_channel(msptr);

		rb_snprintf(text, sizeof(text), "K%s", who->id);

		/* we don't need to track NOREJOIN stuff unless it's our client being kicked */
		if(MyClient(who) && chptr->mode.mode & MODE_NOREJOIN)
			channel_metadata_time_add(chptr, text, rb_current_time(), "KICKNOREJOIN");
	}
	else if (MyClient(source_p))
		sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
				   form_str(ERR_USERNOTINCHANNEL), user, name);

	return 0;
}