/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_names.c: Shows the users who are online.
 *
 *  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 "common.h"
#include "hash.h"
#include "match.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "s_serv.h"
#include "s_conf.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"

static int m_names(struct Client *, struct Client *, int, const char **);

struct Message names_msgtab = {
    "NAMES", 0, 0, 0, MFLG_SLOW,
    {mg_unreg, {m_names, 0}, mg_ignore, mg_ignore, mg_ignore, {m_names, 0}}
};

mapi_clist_av1 names_clist[] = { &names_msgtab, NULL };
DECLARE_MODULE_AV1(names, NULL, NULL, names_clist, NULL, NULL, "$Revision: 254 $");

static void names_global(struct Client *source_p);

/************************************************************************
 * m_names() - Added by Jto 27 Apr 1989
 ************************************************************************/

/*
 * m_names
 *      parv[1] = channel
 */
static int
m_names(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    static time_t last_used = 0;
    struct Channel *chptr = NULL;
    char *s;

    if(parc > 1 && !EmptyString(parv[1])) {
        char *p = LOCAL_COPY(parv[1]);
        if((s = strchr(p, ',')))
            *s = '\0';

        if(!check_channel_name(p)) {
            sendto_one_numeric(source_p, ERR_BADCHANNAME,
                               form_str(ERR_BADCHANNAME),
                               (unsigned char *) p);
            return 0;
        }

        if((chptr = find_channel(p)) != NULL)
            channel_member_names(chptr, source_p, 1);
        else
            sendto_one(source_p, form_str(RPL_ENDOFNAMES),
                       me.name, source_p->name, p);
    } else {
        if(!IsOper(source_p)) {
            if((last_used + ConfigFileEntry.pace_wait) > rb_current_time()) {
                sendto_one(source_p, form_str(RPL_LOAD2HI),
                           me.name, source_p->name, "NAMES");
                sendto_one(source_p, form_str(RPL_ENDOFNAMES),
                           me.name, source_p->name, "*");
                return 0;
            } else
                last_used = rb_current_time();
        }

        names_global(source_p);
        sendto_one(source_p, form_str(RPL_ENDOFNAMES),
                   me.name, source_p->name, "*");
    }

    return 0;
}

/*
 * names_global
 *
 * inputs       - pointer to client struct requesting names
 * output       - none
 * side effects - lists all non public non secret channels
 */
static void
names_global(struct Client *source_p)
{
    int mlen;
    int tlen;
    int cur_len;
    int dont_show = NO;
    rb_dlink_node *lp, *ptr;
    struct Client *target_p;
    struct Channel *chptr = NULL;
    struct membership *msptr;
    char buf[BUFSIZE];
    char *t;

    /* first do all visible channels */
    RB_DLINK_FOREACH(ptr, global_channel_list.head) {
        chptr = ptr->data;
        channel_member_names(chptr, source_p, 0);
    }
    cur_len = mlen = rb_sprintf(buf, form_str(RPL_NAMREPLY),
                                me.name, source_p->name, "*", "*");
    t = buf + mlen;

    /* Second, do all clients in one big sweep */
    RB_DLINK_FOREACH(ptr, global_client_list.head) {
        target_p = ptr->data;
        dont_show = NO;

        if(!IsPerson(target_p) || IsInvisible(target_p))
            continue;

        /* we want to show -i clients that are either:
         *   a) not on any channels
         *   b) only on +p channels
         *
         * both were missed out above.  if the target is on a
         * common channel with source, its already been shown.
         */
        RB_DLINK_FOREACH(lp, target_p->user->channel.head) {
            msptr = lp->data;
            chptr = msptr->chptr;

            if(PubChannel(chptr) || IsMember(source_p, chptr) ||
               SecretChannel(chptr)) {
                dont_show = YES;
                break;
            }
        }

        if(dont_show)
            continue;

        if((cur_len + NICKLEN + 2) > (BUFSIZE - 3)) {
            sendto_one(source_p, "%s", buf);
            cur_len = mlen;
            t = buf + mlen;
        }

        tlen = rb_sprintf(t, "%s ", target_p->name);
        cur_len += tlen;
        t += tlen;
    }

    if(cur_len > mlen)
        sendto_one(source_p, "%s", buf);
}
