/*
 *  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 "hook.h"

static const char kick_desc[] = "Provides the KICK command to remove a user from a channel";

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

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

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

DECLARE_MODULE_AV2(kick, NULL, NULL, kick_clist, NULL, NULL, NULL, NULL, kick_desc);

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

	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;
	}

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

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

		{
			int access_level = get_channel_access(source_p, chptr, sourcems, MODE_ADD, NULL);
			if(access_level < CHFL_HALFOP)
			{
				if(MyConnect(source_p))
				{
					sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
						   me.name, source_p->name, name);
					return;
				}

				/* If its a TS 0 channel, do it the old way */
				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;
				}
			}
			/* Halfops cannot kick ops or other halfops */
			if(access_level == CHFL_HALFOP && MyClient(source_p))
			{
				/* targetms is not yet set here; we check after the target lookup */
			}
		}

	}

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

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

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

	targetms = find_channel_membership(chptr, who);

	if(targetms != 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;
		}

		/* Halfops cannot kick chanops or other halfops */
		if(MyClient(source_p) && !IsServer(source_p) &&
		   get_channel_access(source_p, chptr, sourcems, MODE_ADD, NULL) == CHFL_HALFOP &&
		   (is_chanop(targetms) || is_halfop(targetms)))
		{
			sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
				   me.name, source_p->name, chptr->chname);
			return;
		}

		if(MyClient(source_p))
		{
			hook_data_channel_approval hookdata;

			hookdata.client = source_p;
			hookdata.chptr = chptr;
			hookdata.msptr = sourcems;
			hookdata.target = who;
			hookdata.approved = 1;
			hookdata.dir = MODE_ADD;	/* ensure modules like override speak up */

			call_hook(h_can_kick, &hookdata);

			if (!hookdata.approved)
				return;
		}

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

		/* 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(source_p, ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
					     source_p->name, name, who->name, comment);
		else
			sendto_channel_local(source_p, 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(targetms);
	}
	else if (MyClient(source_p))
		sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
				   form_str(ERR_USERNOTINCHANNEL), user, name);
}
