/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_accept.c: Allows a user to talk to a +g user.
 *
 *  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 "client.h"
#include "hash.h"
#include "ircd.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_serv.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "modules.h"

static int m_accept(struct Client *, struct Client *, int, const char **);
static void build_nicklist(struct Client *, char *, char *, const char *);

static void add_accept(struct Client *, struct Client *);
static void list_accepts(struct Client *);

struct Message accept_msgtab = {
    "ACCEPT", 0, 0, 0, MFLG_SLOW | MFLG_UNREG,
    {mg_unreg, {m_accept, 2}, mg_ignore, mg_ignore, mg_ignore, {m_accept, 2}}
};

mapi_clist_av1 accept_clist[] = {
    &accept_msgtab, NULL
};
DECLARE_MODULE_AV1(accept, NULL, NULL, accept_clist, NULL, NULL, "$Revision: 254 $");

/*
 * m_accept - ACCEPT command handler
 *      parv[1] = servername
 */
static int
m_accept(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    char *nick;
    char *p = NULL;
    static char addbuf[BUFSIZE];
    static char delbuf[BUFSIZE];
    struct Client *target_p;
    int accept_num;

    if(*parv[1] == '*') {
        list_accepts(source_p);
        return 0;
    }

    build_nicklist(source_p, addbuf, delbuf, parv[1]);

    /* parse the delete list */
    for (nick = rb_strtok_r(delbuf, ",", &p); nick != NULL; nick = rb_strtok_r(NULL, ",", &p)) {
        /* shouldnt happen, but lets be paranoid */
        if((target_p = find_named_person(nick)) == NULL) {
            sendto_one_numeric(source_p, ERR_NOSUCHNICK,
                               form_str(ERR_NOSUCHNICK), nick);
            continue;
        }

        /* user isnt on clients accept list */
        if(!accept_message(target_p, source_p)) {
            sendto_one(source_p, form_str(ERR_ACCEPTNOT),
                       me.name, source_p->name, target_p->name);
            continue;
        }

        rb_dlinkFindDestroy(target_p, &source_p->localClient->allow_list);
        rb_dlinkFindDestroy(source_p, &target_p->on_allow_list);
    }

    /* get the number of accepts they have */
    accept_num = rb_dlink_list_length(&source_p->localClient->allow_list);

    /* parse the add list */
    for (nick = rb_strtok_r(addbuf, ",", &p); nick; nick = rb_strtok_r(NULL, ",", &p), accept_num++) {
        /* shouldnt happen, but lets be paranoid */
        if((target_p = find_named_person(nick)) == NULL) {
            sendto_one_numeric(source_p, ERR_NOSUCHNICK,
                               form_str(ERR_NOSUCHNICK), nick);
            continue;
        }

        /* user is already on clients accept list */
        if(accept_message(target_p, source_p)) {
            sendto_one(source_p, form_str(ERR_ACCEPTEXIST),
                       me.name, source_p->name, target_p->name);
            continue;
        }

        if(accept_num >= ConfigFileEntry.max_accept) {
            sendto_one(source_p, form_str(ERR_ACCEPTFULL), me.name, source_p->name);
            return 0;
        }

        /* why is this here? */
        /* del_from accept(target_p, source_p); */
        add_accept(source_p, target_p);
    }

    return 0;
}

/*
 * build_nicklist()
 *
 * input	- pointer to client
 *		- pointer to addbuffer
 *		- pointer to remove buffer
 *		- pointer to list of nicks
 * output	-
 * side effects - addbuf/delbuf are modified to give valid nicks
 */
static void
build_nicklist(struct Client *source_p, char *addbuf, char *delbuf, const char *nicks)
{
    char *name;
    char *p;
    int lenadd;
    int lendel;
    int del;
    char *n = LOCAL_COPY(nicks);

    *addbuf = *delbuf = '\0';
    del = lenadd = lendel = 0;

    /* build list of clients to add into addbuf, clients to remove in delbuf */
    for (name = rb_strtok_r(n, ",", &p); name; name = rb_strtok_r(NULL, ",", &p), del = 0) {
        if(*name == '-') {
            del = 1;
            name++;
        }

        if(find_named_person(name) == NULL) {
            sendto_one_numeric(source_p, ERR_NOSUCHNICK,
                               form_str(ERR_NOSUCHNICK), name);
            continue;
        }

        /* we're deleting a client */
        if(del) {
            if(*delbuf)
                (void) strcat(delbuf, ",");

            (void) strncat(delbuf, name, BUFSIZE - lendel - 1);
            lendel += strlen(name) + 1;
        }
        /* adding a client */
        else {
            if(*addbuf)
                (void) strcat(addbuf, ",");

            (void) strncat(addbuf, name, BUFSIZE - lenadd - 1);
            lenadd += strlen(name) + 1;
        }
    }
}

/*
 * add_accept()
 *
 * input	- pointer to clients accept list to add to
 * 		- pointer to client to add
 * output	- none
 * side effects - target is added to clients list
 */
static void
add_accept(struct Client *source_p, struct Client *target_p)
{
    rb_dlinkAddAlloc(target_p, &source_p->localClient->allow_list);
    rb_dlinkAddAlloc(source_p, &target_p->on_allow_list);
}


/*
 * list_accepts()
 *
 * input 	- pointer to client
 * output	- none
 * side effects	- print accept list to client
 */
static void
list_accepts(struct Client *source_p)
{
    rb_dlink_node *ptr;
    struct Client *target_p;
    char nicks[BUFSIZE];
    int len = 0;
    int len2 = 0;
    int count = 0;

    *nicks = '\0';
    len2 = strlen(source_p->name) + 10;

    RB_DLINK_FOREACH(ptr, source_p->localClient->allow_list.head) {
        target_p = ptr->data;

        if(target_p) {

            if((len + strlen(target_p->name) + len2 > BUFSIZE) || count > 14) {
                sendto_one(source_p, form_str(RPL_ACCEPTLIST),
                           me.name, source_p->name, nicks);

                len = count = 0;
                *nicks = '\0';
            }

            len += rb_snprintf(nicks + len, sizeof(nicks) - len, "%s ", target_p->name);
            count++;
        }
    }

    if(*nicks)
        sendto_one(source_p, form_str(RPL_ACCEPTLIST),
                   me.name, source_p->name, nicks);

    sendto_one(source_p, form_str(RPL_ENDOFACCEPT),
               me.name, source_p->name);

}
