/*
 * In this module we implement call disconnection and clearing procedures.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <syslog.h>
#include "../include/mncc.h"
#include "../include/gsm48_const.h"
#include "call.h"

void
disconnect_mncc(call, cause_loc, cause_val)
	struct call *call;
{
	struct gsm_mncc msg;

	switch (call->mncc_state) {
	case MNCC_STATE_NO_EXIST:
	case MNCC_STATE_DISCONNECT:
	case MNCC_STATE_RELEASE:
		return;
	}
	bzero(&msg, sizeof(struct gsm_mncc));
	msg.msg_type = MNCC_DISC_REQ;
	msg.callref = call->mncc_callref;
	mncc_set_cause(&msg, cause_loc, cause_val);
	send_mncc_to_gsm(&msg, sizeof(struct gsm_mncc));
	call->mncc_state = MNCC_STATE_DISCONNECT;
}

void
disconnect_tmgw(call)
	struct call *call;
{
	switch (call->mgw_state) {
	case MGW_STATE_NO_EXIST:
	case MGW_STATE_CONNECTING:
	case MGW_STATE_DELETING:
		return;
	case MGW_STATE_ALLOCATED:
	case MGW_STATE_COMPLETE:
		tmgw_send_dlcx(call);
		return;
	default:
		syslog(LOG_CRIT,
			"FATAL: invalid MGW state 0x%x in disconnect_tmgw()",
			call->mgw_state);
		exit(1);
	}
}

static char *
cause_to_invite_err(cause)
	struct gsm_mncc_cause *cause;
{
	switch (cause->value) {
	case GSM48_CC_CAUSE_CALL_REJECTED:
		return "403 Call rejected";
	case GSM48_CC_CAUSE_UNASSIGNED_NR:
		return "404 Unassigned number";
	case GSM48_CC_CAUSE_USER_NOTRESPOND:
		return "480 User not responding";
	case GSM48_CC_CAUSE_RESOURCE_UNAVAIL:
		return "503 GSM network resource unavailable";
	case GSM48_CC_CAUSE_TEMP_FAILURE:
		return "503 Temporary failure";
	case GSM48_CC_CAUSE_SWITCH_CONG:
		return "503 Switch congestion at MSC";
	case GSM48_CC_CAUSE_USER_BUSY:
		return "486 User busy";
	case GSM48_CC_CAUSE_DEST_OOO:
		return "502 Destination out of order";
	case GSM48_CC_CAUSE_NETWORK_OOO:
		return "503 Network out of order";
	default:
		return "480 Unavailable (unspecified)";
	}
}

void
disconnect_sip(call, cause)
	struct call *call;
	struct gsm_mncc_cause *cause;
{
	switch (call->sip_state) {
	case SIP_STATE_INVITE_PROC:
	case SIP_STATE_RINGING:
	case SIP_STATE_RINGING_REL:
		strcpy(call->invite_fail, cause_to_invite_err(cause));
		signal_invite_error(call);
		break;
	case SIP_STATE_INVITE_200:
		/* have to wait for SIP ACK, then send BYE */
		break;
	case SIP_STATE_CONNECTED:
		initiate_bye(call);
		break;
	}
}