/*
 * Copyright (C) 2008 Sippy Software, Inc., http://www.sippysoft.com
 *
 * This file is part of ser, a free SIP server.
 *
 * ser 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
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <stdio.h>
#include <sys/uio.h>

#include "../../core/ip_addr.h"
#include "../../core/parser/msg_parser.h"
#include "../../core/sr_module.h"
#include "../../core/ut.h"
#include "rtpproxy.h"
#include "rtpproxy_funcs.h"

int fixup_var_str_int(void **param, int param_no)
{
	int ret;
	pv_elem_t *model;
	str s;

	if(param_no == 1) {
		model = NULL;
		s.s = (char *)(*param);
		s.len = strlen(s.s);
		if(pv_parse_format(&s, &model) < 0) {
			LM_ERR("wrong format[%s]!\n", (char *)(*param));
			return E_UNSPEC;
		}
		if(model == NULL) {
			LM_ERR("empty parameter!\n");
			return E_UNSPEC;
		}
		*param = (void *)model;
	} else if(param_no == 2) {
		/* According to
		 * https://www.kamailio.org/docs/modules/1.5.x/nathelper.html#rtpproxy_stream2xxx
		 * this could be -1 */
		s.s = (char *)(*param);
		s.len = strlen(s.s);
		if(str2sint(&s, &ret) == 0) {
			pkg_free(*param);
			*param = (void *)(long)ret;
		} else {
			LM_ERR("bad number <%s>\n", (char *)(*param));
			return E_CFG;
		}
	}
	return 0;
}

int rtpproxy_stream(struct sip_msg *msg, str *pname, int count, int stream2uac)
{
	int nitems;
	str callid, from_tag, to_tag;
	struct rtpp_node *node;
	char cbuf[16];
	struct iovec v[] = {{NULL, 0}, {cbuf, 0}, /* 1 P<count> */
			{" ", 1}, {NULL, 0},			  /* 3 callid */
			{" ", 1}, {NULL, 0},			  /* 5 pname */
			{" session ", 9}, {NULL, 0},	  /* 7 from tag */
			{";1 ", 3}, {NULL, 0},			  /* 9 to tag */
			{";1", 2}};

	if(get_callid(msg, &callid) == -1 || callid.len == 0) {
		LM_ERR("can't get Call-Id field\n");
		return -1;
	}
	if(get_to_tag(msg, &to_tag) == -1) {
		LM_ERR("can't get To tag\n");
		return -1;
	}
	if(get_from_tag(msg, &from_tag) == -1 || from_tag.len == 0) {
		LM_ERR("can't get From tag\n");
		return -1;
	}
	v[1].iov_len = sprintf(cbuf, "P%d", count);
	STR2IOVEC(callid, v[3]);
	STR2IOVEC(*pname, v[5]);
	node = select_rtpp_node(callid, 1);
	if(!node) {
		LM_ERR("no available proxies\n");
		return -1;
	}
	if(node->rn_ptl_supported == 0) {
		LM_ERR("required functionality is not "
			   "supported by the version of the RTPproxy running on the "
			   "selected "
			   "node.  Please upgrade the RTPproxy and try again.\n");
		return -1;
	}
	set_rtp_inst_pvar(msg, &node->rn_url);
	nitems = 11;
	if(stream2uac == 0) {
		if(to_tag.len == 0)
			return -1;
		STR2IOVEC(to_tag, v[7]);
		STR2IOVEC(from_tag, v[9]);
	} else {
		STR2IOVEC(from_tag, v[7]);
		STR2IOVEC(to_tag, v[9]);
		if(to_tag.len <= 0)
			nitems -= 2;
	}
	send_rtpp_command(node, v, nitems);

	return 1;
}

static int rtpproxy_stream2_f(
		struct sip_msg *msg, char *str1, int count, int stream2uac)
{
	str pname;

	if(str1 == NULL || pv_printf_s(msg, (pv_elem_p)str1, &pname) != 0)
		return -1;
	return rtpproxy_stream(msg, &pname, count, stream2uac);
}

int rtpproxy_stream2uac2_f(struct sip_msg *msg, char *str1, char *str2)
{

	return rtpproxy_stream2_f(msg, str1, (int)(long)str2, 1);
}

int rtpproxy_stream2uas2_f(struct sip_msg *msg, char *str1, char *str2)
{

	return rtpproxy_stream2_f(msg, str1, (int)(long)str2, 0);
}

int rtpproxy_stop_stream(struct sip_msg *msg, int stream2uac)
{
	int nitems;
	str callid, from_tag, to_tag;
	struct rtpp_node *node;
	struct iovec v[] = {{NULL, 0}, {"S", 1}, /* 1 */
			{" ", 1}, {NULL, 0},			 /* 3 callid */
			{" ", 1}, {NULL, 0},			 /* 5 from tag */
			{";1 ", 3}, {NULL, 0},			 /* 7 to tag */
			{";1", 2}};

	if(get_callid(msg, &callid) == -1 || callid.len == 0) {
		LM_ERR("can't get Call-Id field\n");
		return -1;
	}
	if(get_to_tag(msg, &to_tag) == -1) {
		LM_ERR("can't get To tag\n");
		return -1;
	}
	if(get_from_tag(msg, &from_tag) == -1 || from_tag.len == 0) {
		LM_ERR("can't get From tag\n");
		return -1;
	}
	STR2IOVEC(callid, v[3]);
	node = select_rtpp_node(callid, 1);
	if(!node) {
		LM_ERR("no available proxies\n");
		return -1;
	}
	if(node->rn_ptl_supported == 0) {
		LM_ERR("required functionality is not "
			   "supported by the version of the RTPproxy running on the "
			   "selected "
			   "node.  Please upgrade the RTPproxy and try again.\n");
		return -1;
	}
	set_rtp_inst_pvar(msg, &node->rn_url);
	nitems = 9;
	if(stream2uac == 0) {
		if(to_tag.len == 0)
			return -1;
		STR2IOVEC(to_tag, v[5]);
		STR2IOVEC(from_tag, v[7]);
	} else {
		STR2IOVEC(from_tag, v[5]);
		STR2IOVEC(to_tag, v[7]);
		if(to_tag.len <= 0)
			nitems -= 2;
	}
	send_rtpp_command(node, v, nitems);

	return 1;
}

int rtpproxy_stop_stream2uac2_f(struct sip_msg *msg, char *str1, char *str2)
{

	return rtpproxy_stop_stream(msg, 1);
}

int rtpproxy_stop_stream2uas2_f(struct sip_msg *msg, char *str1, char *str2)
{

	return rtpproxy_stop_stream(msg, 0);
}
