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/********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2012 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Stuff to handle, save and search IRC buddies                         */

/*
  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 with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
  Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "bitlbee.h"
#include "ipc.h"

irc_user_t *irc_user_new(irc_t *irc, const char *nick)
{
	irc_user_t *iu = g_new0(irc_user_t, 1);

	iu->irc = irc;
	iu->nick = g_strdup(nick);
	iu->user = iu->host = iu->fullname = iu->nick;

	iu->key = g_strdup(nick);
	nick_lc(irc, iu->key);
	/* Using the hash table for speed and irc->users for easy iteration
	   through the list (since the GLib API doesn't have anything sane
	   for that.) */
	g_hash_table_insert(irc->nick_user_hash, iu->key, iu);
	irc->users = g_slist_insert_sorted(irc->users, iu, irc_user_cmp);

	return iu;
}

int irc_user_free(irc_t *irc, irc_user_t *iu)
{
	static struct im_connection *last_ic;
	static char *msg;

	if (!iu) {
		return 0;
	}

	if (iu->bu &&
	    (iu->bu->ic->flags & OPT_LOGGING_OUT) &&
	    iu->bu->ic != last_ic) {
		char host_prefix[] = "bitlbee.";
		char *s;

		/* Irssi recognises netsplits by quitmsgs with two
		   hostnames, where a hostname is a "word" with one
		   of more dots. Mangle no-dot hostnames a bit. */
		if (strchr(irc->root->host, '.')) {
			*host_prefix = '\0';
		}

		last_ic = iu->bu->ic;
		g_free(msg);
		if (!set_getbool(&irc->b->set, "simulate_netsplit")) {
			msg = g_strdup("Account off-line");
		} else if ((s = strchr(iu->bu->ic->acc->user, '@'))) {
			msg = g_strdup_printf("%s%s %s", host_prefix,
			                      irc->root->host, s + 1);
		} else {
			msg = g_strdup_printf("%s%s %s.%s",
			                      host_prefix, irc->root->host,
			                      iu->bu->ic->acc->prpl->name, irc->root->host);
		}
	} else if (!iu->bu || !(iu->bu->ic->flags & OPT_LOGGING_OUT)) {
		g_free(msg);
		msg = g_strdup("Removed");
		last_ic = NULL;
	}
	irc_user_quit(iu, msg);

	irc->users = g_slist_remove(irc->users, iu);
	g_hash_table_remove(irc->nick_user_hash, iu->key);

	g_free(iu->nick);
	if (iu->nick != iu->user) {
		g_free(iu->user);
	}
	if (iu->nick != iu->host) {
		g_free(iu->host);
	}
	if (iu->nick != iu->fullname) {
		g_free(iu->fullname);
	}
	g_free(iu->pastebuf);
	if (iu->pastebuf_timer) {
		b_event_remove(iu->pastebuf_timer);
	}
	g_free(iu->key);
	g_free(iu);

	return 1;
}

irc_user_t *irc_user_by_name(irc_t *irc, const char *nick)
{
	char key[strlen(nick) + 1];

	strcpy(key, nick);
	if (nick_lc(irc, key)) {
		return g_hash_table_lookup(irc->nick_user_hash, key);
	} else {
		return NULL;
	}
}

int irc_user_set_nick(irc_user_t *iu, const char *new)
{
	irc_t *irc = iu->irc;
	irc_user_t *new_iu;
	char key[strlen(new) + 1];
	GSList *cl;

	strcpy(key, new);
	if (iu == NULL || !nick_lc(irc, key) ||
	    ((new_iu = irc_user_by_name(irc, new)) && new_iu != iu)) {
		return 0;
	}

	for (cl = irc->channels; cl; cl = cl->next) {
		irc_channel_t *ic = cl->data;

		/* Send a NICK update if we're renaming our user, or someone
		   who's in the same channel like our user. */
		if (iu == irc->user ||
		    ((ic->flags & IRC_CHANNEL_JOINED) &&
		     irc_channel_has_user(ic, iu))) {
			irc_send_nick(iu, new);
			break;
		}
	}

	irc->users = g_slist_remove(irc->users, iu);
	g_hash_table_remove(irc->nick_user_hash, iu->key);

	if (iu->nick == iu->user) {
		iu->user = NULL;
	}
	if (iu->nick == iu->host) {
		iu->host = NULL;
	}
	if (iu->nick == iu->fullname) {
		iu->fullname = NULL;
	}
	g_free(iu->nick);
	iu->nick = g_strdup(new);
	if (iu->user == NULL) {
		iu->user = g_strdup(iu->nick);
	}
	if (iu->host == NULL) {
		iu->host = g_strdup(iu->nick);
	}
	if (iu->fullname == NULL) {
		iu->fullname = g_strdup(iu->nick);
	}

	g_free(iu->key);
	iu->key = g_strdup(key);
	g_hash_table_insert(irc->nick_user_hash, iu->key, iu);
	irc->users = g_slist_insert_sorted(irc->users, iu, irc_user_cmp);

	if (iu == irc->user) {
		ipc_to_master_str("NICK :%s\r\n", new);
	}

	return 1;
}

gint irc_user_cmp(gconstpointer a_, gconstpointer b_)
{
	const irc_user_t *a = a_, *b = b_;

	return strcmp(a->key, b->key);
}

const char *irc_user_get_away(irc_user_t *iu)
{
	irc_t *irc = iu->irc;
	bee_user_t *bu = iu->bu;

	if (iu == irc->user) {
		return set_getstr(&irc->b->set, "away");
	} else if (bu) {
		if (!bu->flags & BEE_USER_ONLINE) {
			return "Offline";
		} else if (bu->flags & BEE_USER_AWAY) {
			if (bu->status_msg) {
				static char ret[MAX_STRING];
				g_snprintf(ret, MAX_STRING - 1, "%s (%s)",
				           bu->status ? : "Away", bu->status_msg);
				return ret;
			} else {
				return bu->status ? : "Away";
			}
		}
	}

	return NULL;
}

void irc_user_quit(irc_user_t *iu, const char *msg)
{
	GSList *l;
	gboolean send_quit = FALSE;

	if (!iu) {
		return;
	}

	for (l = iu->irc->channels; l; l = l->next) {
		irc_channel_t *ic = l->data;
		send_quit |= irc_channel_del_user(ic, iu, IRC_CDU_SILENT, NULL) &&
		             (ic->flags & IRC_CHANNEL_JOINED);
	}

	if (send_quit) {
		irc_send_quit(iu, msg);
	}
}

/* User-type dependent functions, for root/NickServ: */
static gboolean root_privmsg(irc_user_t *iu, const char *msg)
{
	char cmd[strlen(msg) + 1];

	strcpy(cmd, msg);
	root_command_string(iu->irc, cmd);

	return TRUE;
}

static gboolean root_ctcp(irc_user_t *iu, char * const *ctcp)
{
	if (g_strcasecmp(ctcp[0], "VERSION") == 0) {
		irc_send_msg_f(iu, "NOTICE", iu->irc->user->nick, "\001%s %s\001",
		               ctcp[0], PACKAGE " " BITLBEE_VERSION);
	} else if (g_strcasecmp(ctcp[0], "PING") == 0) {
		irc_send_msg_f(iu, "NOTICE", iu->irc->user->nick, "\001%s %s\001",
		               ctcp[0], ctcp[1] ? : "");
	}

	return TRUE;
}

const struct irc_user_funcs irc_user_root_funcs = {
	root_privmsg,
	root_ctcp,
};

/* Echo to yourself: */
static gboolean self_privmsg(irc_user_t *iu, const char *msg)
{
	irc_send_msg(iu, "PRIVMSG", iu->nick, msg, NULL);

	return TRUE;
}

const struct irc_user_funcs irc_user_self_funcs = {
	self_privmsg,
};