/* RFC1459+TS8 protocol module for IRC Services.
 *
 * IRC Services is copyright (c) 1996-2007 Andrew Church.
 *     E-mail: <achurch@achurch.org>
 * Parts written by Andrew Kempe and others.
 * This program is free but copyrighted software; see the file COPYING for
 * details.
 */

#include "services.h"
#include "modules.h"
#include "conffile.h"
#include "messages.h"

/*************************************************************************/

static Module *module;

static char *NetworkDomain = NULL;

/*************************************************************************/
/************************** User/channel modes ***************************/
/*************************************************************************/

struct modedata_init {
    uint8 mode;
    ModeData data;
};

static const struct modedata_init new_usermodes[] = {
};

static const struct modedata_init new_chanmodes[] = {
};

static const struct modedata_init new_chanusermodes[] = {
};

static void init_modes(void)
{
    int i;

    for (i = 0; i < lenof(new_usermodes); i++)
	usermodes[new_usermodes[i].mode] = new_usermodes[i].data;
    for (i = 0; i < lenof(new_chanmodes); i++)
	chanmodes[new_chanmodes[i].mode] = new_chanmodes[i].data;
    for (i = 0; i < lenof(new_chanusermodes); i++)
	chanusermodes[new_chanusermodes[i].mode] = new_chanusermodes[i].data;

    mode_setup();
};

/*************************************************************************/
/************************* IRC message receiving *************************/
/*************************************************************************/

static void m_nick(char *source, int ac, char **av)
{
    if (*source) {
	/* Old user changing nicks. */
	if (ac != 2) {
	    if (debug)
		module_log("debug: NICK message: wrong number of parameters"
			   " (%d) for source `%s'", ac, source);
	} else {
	    do_nick(source, ac, av);
	}
	return;
    }

    /* New user.  We get the information we want from the USER command, so
     * we don't do anything else here. */
}

/*************************************************************************/

static void m_user(char *source, int ac, char **av)
{
    char *new_av[7];

    if (ac != 5)
	return;
    new_av[0] = source;      /* Nickname */
    new_av[1] = (char *)"0"; /* # of hops (was in NICK command... we lose) */
    new_av[2] = av[0];       /* Timestamp */
    new_av[3] = av[1];       /* Username */
    new_av[4] = av[2];       /* Hostname */
    new_av[5] = av[3];       /* Server */
    new_av[6] = av[4];       /* Real name */
    do_nick("", 7, new_av);
}

/*************************************************************************/

static Message ts8_messages[] = {
    { "NICK",      m_nick },
    { "USER",      m_user },
    { NULL }
};

/*************************************************************************/
/************************** IRC message sending **************************/
/*************************************************************************/

/* Send a NICK command for a new user. */

static void do_send_nick(const char *nick, const char *user, const char *host,
			 const char *server, const char *name,
			 const char *modes)
{
    send_cmd(NULL, "NICK %s :1", nick);
    send_cmd(nick, "USER %ld %s %s %s :%s", (long)time(NULL),
	     user, host, server, name);
    if (modes)
	send_cmd(nick, "MODE %s +%s", nick, modes);
}

/*************************************************************************/

/* Send a NICK command to change an existing user's nick. */

static void do_send_nickchange(const char *nick, const char *newnick)
{
    send_cmd(nick, "NICK %s %ld", newnick, (long)time(NULL));
}

/*************************************************************************/

/* Send a command to change a user's "real name". */

static void do_send_namechange(const char *nick, const char *newname)
{
    /* Not supported by this protocol. */
}

/*************************************************************************/

/* Send a SERVER command, and anything else needed at the beginning of the
 * connection.
 */

static void do_send_server(void)
{
    send_cmd(NULL, "PASS :%s", RemotePassword);
    send_cmd(NULL, "SERVER %s 1 :%s", ServerName, ServerDesc);
}

/*************************************************************************/

/* Send a SERVER command for a remote (juped) server. */

static void do_send_server_remote(const char *server, const char *reason)
{
    send_cmd(NULL, "SERVER %s 2 :%s", server, reason);
}

/*************************************************************************/

/* Send a WALLOPS. */

static void do_wallops(const char *source, const char *fmt, ...)
{
    va_list args;
    char buf[BUFSIZE];

    va_start(args, fmt);
    vsnprintf(buf, sizeof(buf), fmt, args);
    va_end(args);
    send_cmd(source ? source : ServerName, "WALLOPS :%s", buf);
}

/*************************************************************************/

/* Send a NOTICE to all users on the network. */

static void do_notice_all(const char *source, const char *fmt, ...)
{
    va_list args;
    char msgbuf[BUFSIZE];

    va_start(args, fmt);
    vsnprintf(msgbuf, sizeof(msgbuf), fmt, args);
    va_end(args);
    if (NetworkDomain) {
	send_cmd(source, "NOTICE $*.%s :%s", NetworkDomain, msgbuf);
    } else {
	/* Go through all common top-level domains.  If you have others,
	 * add them here. */
	send_cmd(source, "NOTICE $*.com :%s", msgbuf);
	send_cmd(source, "NOTICE $*.net :%s", msgbuf);
	send_cmd(source, "NOTICE $*.org :%s", msgbuf);
	send_cmd(source, "NOTICE $*.edu :%s", msgbuf);
    }
}

/*************************************************************************/

/* Send a command which modifies channel status. */

static void do_send_channel_cmd(const char *source, const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    vsend_cmd(source, fmt, args);
    va_end(args);
}

/*************************************************************************/
/******************************* Callbacks *******************************/
/*************************************************************************/

static int do_set_topic(const char *source, Channel *c, const char *topic,
			const char *setter, time_t t)
{
    if (c->topic_time && t >= c->topic_time)
	t = c->topic_time - 1;  /* Force topic change */
    if (setter)
	return 0;
    c->topic_time = t;
    send_cmd(source, "TOPIC %s %s %ld :%s", c->name, c->topic_setter,
	     (long)c->topic_time, c->topic ? c->topic : "");
    return 1;
}

/*************************************************************************/
/***************************** Module stuff ******************************/
/*************************************************************************/

const int32 module_version = MODULE_VERSION_CODE;

ConfigDirective module_config[] = {
    { "NetworkDomain", { { CD_STRING, 0, &NetworkDomain } } },
    { NULL }
};

/*************************************************************************/

int init_module(Module *module_)
{
    module = module_;

    protocol_name     = "RFC1459+TS8";
    protocol_version  = "ircd2.8.x";
    protocol_features = 0;
    protocol_nickmax  = 9;

    if (!register_messages(ts8_messages)) {
	module_log("Unable to register messages");
	exit_module(1);
	return 0;
    }

    if (!add_callback(NULL, "set topic", do_set_topic)) {
	module_log("Unable to add callbacks");
	exit_module(1);
	return 0;
    }

    init_modes();

    send_nick          = do_send_nick;
    send_nickchange    = do_send_nickchange;
    send_namechange    = do_send_namechange;
    send_server        = do_send_server;
    send_server_remote = do_send_server_remote;
    wallops            = do_wallops;
    notice_all         = do_notice_all;
    send_channel_cmd   = do_send_channel_cmd;
    pseudoclient_modes = "";
    enforcer_modes     = "";

    return 1;
}

/*************************************************************************/

int exit_module(int shutdown)
{
    if (!shutdown) {
	/* Do not allow removal */
	return 0;
    }

    remove_callback(NULL, "set topic", do_set_topic);
    unregister_messages(ts8_messages);
    return 1;
}

/*************************************************************************/