/*
 * Kamailio osp module.
 *
 * This module enables Kamailio to communicate with an Open Settlement
 * Protocol (OSP) server.  The Open Settlement Protocol is an ETSI
 * defined standard for Inter-Domain VoIP pricing, authorization
 * and usage exchange.  The technical specifications for OSP
 * (ETSI TS 101 321 V4.1.1) are available at www.etsi.org.
 *
 * Uli Abend was the original contributor to this module.
 *
 * Copyright (C) 2001-2005 Fhg Fokus
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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
 *
 * History:
 * ---------
 *  2006-03-13  TM functions are loaded via API function (bogdan)
 */

#include "../../modules/tm/tm_load.h"
#include "tm.h"
#include "destination.h"

struct tm_binds osp_tmb;

static void ospOnReq(struct cell *t, int type, struct tmcb_params *ps);
static void ospTmcbFunc(struct cell *t, int type, struct tmcb_params *ps);

/*
 * Load TM API
 * return 0 success, -1 failure
 */
int ospInitTm(void)
{
	if(load_tm_api(&osp_tmb) != 0) {
		LM_ERR("failed to load TM API\n");
		LM_ERR("TM is required for reporting call setup usage\n");
		return -1;
	}

	/* Register callbacks, listen for all incoming requests  */
	if(osp_tmb.register_tmcb(0, 0, TMCB_REQUEST_IN, ospOnReq, 0, 0) <= 0) {
		LM_ERR("failed to register TMCB_REQUEST_IN callback\n");
		LM_ERR("TM callbacks are required for reporting call set up usage\n");
		return -1;
	}

	return 0;
}

/*
 * Register OSP callback function
 * param t
 * param type
 * param ps
 */
static void ospOnReq(struct cell *t, int type, struct tmcb_params *ps)
{
	int tmcb_types;

	/* install addaitional handlers */
	tmcb_types =
			//        TMCB_REQUEST_FWDED |
			//        TMCB_RESPONSE_FWDED |
			TMCB_ON_FAILURE |
			//        TMCB_LOCAL_COMPLETED |
			/* report on completed transactions */
			TMCB_RESPONSE_OUT |
			/* account e2e acks if configured to do so */
			TMCB_E2EACK_IN |
			/* report on missed calls */
			TMCB_ON_FAILURE_RO |
			/* get incoming replies ready for processing */
			//        TMCB_RESPONSE_IN |
			0;

	if(osp_tmb.register_tmcb(0, t, tmcb_types, ospTmcbFunc, 0, 0) <= 0) {
		LM_ERR("failed to register TM callbacks\n");
		LM_ERR("TM callbacks are required for reporting call setup usage\n");
		return;
	}
}

/*
 * OSP callback function
 * param t
 * param type
 * param ps
 */
static void ospTmcbFunc(struct cell *t, int type, struct tmcb_params *ps)
{
	if(type & TMCB_RESPONSE_OUT) {
		LM_DBG("RESPONSE_OUT\n");
	} else if(type & TMCB_E2EACK_IN) {
		LM_DBG("E2EACK_IN\n");
	} else if(type & TMCB_ON_FAILURE_RO) {
		LM_DBG("FAILURE_RO\n");
	} else if(type & TMCB_RESPONSE_IN) {
		LM_DBG("RESPONSE_IN\n");
	} else if(type & TMCB_REQUEST_FWDED) {
		LM_DBG("REQUEST_FWDED\n");
	} else if(type & TMCB_RESPONSE_FWDED) {
		LM_DBG("RESPONSE_FWDED\n");
	} else if(type & TMCB_ON_FAILURE) {
		LM_DBG("FAILURE\n");
	} else if(type & TMCB_LOCAL_COMPLETED) {
		LM_DBG("COMPLETED\n");
	} else {
		LM_DBG("something else '%d'\n", type);
	}

	if(t) {
		ospRecordEvent(
				t->uac[t->nr_of_outgoings - 1].last_received, t->uas.status);
	} else {
		LM_DBG("cell is empty\n");
	}
}
