/*
 * This C module is the main for itt-pcm-br, a program in the icE1 TRAU tester
 * suite that bridges two different timeslots (two TRAU channels) on the A i/f.
 *
 * This code is based on osmo-e1d-pipe,
 * (C) 2020-2022 by Harald Welte <laforge@osmocom.org>,
 * SPDX-License-Identifier: GPL-2.0+
 */

#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/application.h>
#include <osmocom/e1d/proto_clnt.h>

#include "../libutil/open_ts.h"
#include "../libutil/stdin_handler.h"
#include "globals.h"

struct osmo_e1dp_client *g_client;
int tsa_fd, tsb_fd;

static const char *e1d_socket_path = E1DP_DEFAULT_SOCKET;
static const char *timeslot_spec_a, *timeslot_spec_b;
static void *g_ctx;
static struct osmo_fd tsa_ofd, tsb_ofd, stdin_ofd;

static void process_cmdline(int argc, char **argv)
{
	extern int optind;
	extern char *optarg;
	int c;

	while ((c = getopt(argc, argv, "p:")) != EOF) {
		switch (c) {
		case 'p':
			e1d_socket_path = optarg;
			continue;
		default:
		usage:
			fprintf(stderr,
			"usage: %s [-p socket] intf:line:ts intf:line:ts\n",
				argv[0]);
			exit(1);
		}
	}
	if (argc != optind + 2)
		goto usage;
	timeslot_spec_a = argv[optind];
	timeslot_spec_b = argv[optind+1];
}

int main(int argc, char **argv)
{
	process_cmdline(argc, argv);
	g_ctx = talloc_named_const(NULL, 0, "g_ctx");
	OSMO_ASSERT(g_ctx);
	osmo_init_logging2(g_ctx, NULL);

	g_client = osmo_e1dp_client_create(g_ctx, e1d_socket_path);
	if (!g_client) {
		fprintf(stderr, "error: cannot connect to osmo-e1d at %s\n",
			e1d_socket_path);
		exit(1);
	}
	tsa_fd = open_e1d_ts(g_client, timeslot_spec_a);
	tsb_fd = open_e1d_ts(g_client, timeslot_spec_b);

	osmo_fd_setup(&tsa_ofd, tsa_fd, OSMO_FD_READ, tsa_fd_cb, NULL, 0);
	OSMO_ASSERT(osmo_fd_register(&tsa_ofd) == 0);

	osmo_fd_setup(&tsb_ofd, tsb_fd, OSMO_FD_READ, tsb_fd_cb, NULL, 0);
	OSMO_ASSERT(osmo_fd_register(&tsb_ofd) == 0);

	osmo_fd_setup(&stdin_ofd, 0, OSMO_FD_READ, stdin_select_cb,
			handle_user_cmd, 0);
	OSMO_ASSERT(osmo_fd_register(&stdin_ofd) == 0);

	while (1) {
		osmo_select_main(0);
	}
}