/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_topic.c: Sets a channel topic.
 *
 *  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 "hash.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "s_newconf.h"
#include "s_conf.h"
#include "s_serv.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"
#include "packet.h"
#include "tgchange.h"

static int m_topic(struct Client *, struct Client *, int, const char **);
static int ms_topic(struct Client *, struct Client *, int, const char **);

struct Message topic_msgtab = {
    "TOPIC", 0, 0, 0, MFLG_SLOW,
    {mg_unreg, {m_topic, 2}, {m_topic, 2}, {ms_topic, 5}, mg_ignore, {m_topic, 2}}
};

mapi_clist_av1 topic_clist[] = { &topic_msgtab, NULL };
DECLARE_MODULE_AV1(topic, NULL, NULL, topic_clist, NULL, NULL, "$Revision: 254 $");

/*
 * m_topic
 *      parv[1] = channel name
 *	parv[2] = new topic, if setting topic
 */
static int
m_topic(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    struct Channel *chptr = NULL;
    struct membership *msptr;
    char *p = NULL;
    const char *name;
    int operspy = 0;

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

    name = parv[1];

    if(IsOperSpy(source_p) && parv[1][0] == '!') {
        name++;
        operspy = 1;

        if(EmptyString(name)) {
            sendto_one(source_p, form_str(ERR_NEEDMOREPARAMS),
                       me.name, source_p->name, "TOPIC");
            return 0;
        }
    }

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

    if(!IsChannelName(name)) {
        sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
                           form_str(ERR_NOSUCHCHANNEL), name);
        return 0;
    }

    chptr = find_channel(name);

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

    /* setting topic */
    if(parc > 2) {
        char topic_info[USERHOST_REPLYLEN];

        msptr = find_channel_membership(chptr, source_p);

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

        if(MyClient(source_p) && !is_chanop_voiced(msptr) &&
           !IsOper(source_p) &&
           !add_channel_target(source_p, chptr)) {
            sendto_one(source_p, form_str(ERR_TARGCHANGE),
                       me.name, source_p->name, chptr->chname);
            return 0;
        }

        if(MyClient(source_p) && (chptr->mode.mode & MODE_TOPICLIMIT) && !is_any_op(msptr)) {
            if(IsOverride(source_p)) {
                sendto_wallops_flags(UMODE_WALLOP, &me,
                                     "%s is overriding TOPIC on [%s]",
                                     get_oper_name(source_p), chptr->chname);
                sendto_server(NULL, chptr, NOCAPS, NOCAPS,
                              ":%s WALLOPS :%s is overriding TOPIC on [%s]",
                              me.name, get_oper_name(source_p), chptr->chname);
            } else {
                sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
                           me.name, source_p->name, parv[1]);
                return 0;
            }

        }

        if(ConfigChannel.host_in_topic)
            sprintf(topic_info, "%s!%s@%s",
                       source_p->name, source_p->username, source_p->host);
        else
            rb_strlcpy(topic_info, source_p->name, sizeof(topic_info));

        set_channel_topic(chptr, parv[2], topic_info, rb_current_time());

        sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
                      ":%s TOPIC %s :%s",
                      use_id(source_p), chptr->chname,
                      chptr->topic == NULL ? "" : chptr->topic);
        sendto_channel_local(ALL_MEMBERS,
                             chptr, ":%s!%s@%s TOPIC %s :%s",
                             source_p->name, source_p->username,
                             source_p->host, chptr->chname,
                             chptr->topic == NULL ? "" : chptr->topic);

    } else if(MyClient(source_p)) {
        if(operspy)
            report_operspy(source_p, "TOPIC", chptr->chname);
        if(!IsMember(source_p, chptr) && SecretChannel(chptr) &&
           !operspy) {
            sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
                               form_str(ERR_NOTONCHANNEL), name);
            return 0;
        }
        if(chptr->topic == NULL)
            sendto_one(source_p, form_str(RPL_NOTOPIC),
                       me.name, source_p->name, name);
        else {
            sendto_one(source_p, form_str(RPL_TOPIC),
                       me.name, source_p->name, chptr->chname, chptr->topic);

            sendto_one(source_p, form_str(RPL_TOPICWHOTIME),
                       me.name, source_p->name, chptr->chname,
                       chptr->topic_info, chptr->topic_time);
        }
    }

    return 0;
}

/*
 * ms_topic
 *      parv[1] = channel name
 *	parv[2] = topic_info
 *	parv[3] = topic_info time
 *	parv[4] = new channel topic
 *
 * Let servers always set a topic
 */
static int
ms_topic(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    struct Channel *chptr = NULL;

    if(IsChannelName(parv[1])) {
        if((chptr = find_channel(parv[1])) == NULL)
            return 0;

        set_channel_topic(chptr, parv[4], parv[2], atoi(parv[3]));

        sendto_channel_local(ALL_MEMBERS, chptr, ":%s TOPIC %s :%s",
                             source_p->name, parv[1],
                             chptr->topic == NULL ? "" : chptr->topic);
    }

    return 0;
}