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/* Code for a software PCU to test a SGSN.. */

/* (C) 2013 by Holger Hans Peter Freyther
 *
 * All Rights Reserved
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

extern "C" {
#include <osmocom/core/talloc.h>
#include <pcu_vty.h>
}

#include <gprs_bssgp_pcu.h>
#include <gprs_rlcmac.h>

#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>

/* Extern data to please the underlying code */
void *tall_pcu_ctx;
struct gprs_rlcmac_bts *gprs_rlcmac_bts;
int16_t spoof_mnc = 0, spoof_mcc = 0;

extern void test_replay_gprs_attach(struct gprs_bssgp_pcu *pcu);
extern void test_replay_gprs_data(struct gprs_bssgp_pcu *, struct msgb *, struct tlv_parsed *);

struct gprs_rlcmac_bts *create_bts()
{
	struct gprs_rlcmac_bts *bts;

	bts = talloc_zero(tall_pcu_ctx, struct gprs_rlcmac_bts);
	if (!bts)
		return NULL;
	bts->fc_interval = 100;
	bts->initial_cs_dl = bts->initial_cs_ul = 1;
	bts->cs1 = 1;
	bts->t3142 = 20;
	bts->t3169 = 5;
	bts->t3191 = 5;
	bts->t3193_msec = 100;
	bts->t3195 = 5;
	bts->n3101 = 10;
	bts->n3103 = 4;
	bts->n3105 = 8;
	bts->alpha = 0; /* a = 0.0 */

	if (!bts->alloc_algorithm)
		bts->alloc_algorithm = alloc_algorithm_b;

	return bts;
}

static void bvci_unblocked(struct gprs_bssgp_pcu *pcu)
{
	printf("BVCI unblocked. We can begin with test cases.\n");
	test_replay_gprs_attach(pcu);
}

static void bssgp_data(struct gprs_bssgp_pcu *pcu, struct msgb *msg, struct tlv_parsed *tp)
{
	test_replay_gprs_data(pcu, msg, tp);
}

void create_and_connect_bssgp(struct gprs_rlcmac_bts *bts,
			uint32_t sgsn_ip, uint16_t sgsn_port)
{
	struct gprs_bssgp_pcu *pcu;

	pcu = gprs_bssgp_create_and_connect(bts, 0, sgsn_ip, sgsn_port,
					20, 20, 20, 0x901, 0x99, 1, 0, 0);
	pcu->on_unblock_ack = bvci_unblocked;
	pcu->on_dl_unit_data = bssgp_data;
}

int main(int argc, char **argv)
{
	struct gprs_rlcmac_bts *bts;

	tall_pcu_ctx = talloc_named_const(NULL, 1, "moiji-mobile Emu-PCU context");
	if (!tall_pcu_ctx)
		abort();

	msgb_set_talloc_ctx(tall_pcu_ctx);
	osmo_init_logging(&gprs_log_info);
	vty_init(&pcu_vty_info);
	pcu_vty_init(&gprs_log_info);

	gprs_rlcmac_bts = create_bts();
	if (!gprs_rlcmac_bts)
		abort();

	create_and_connect_bssgp(gprs_rlcmac_bts, INADDR_LOOPBACK, 23000);
	
	for (;;)
		osmo_select_main(0);

	return EXIT_SUCCESS;
}

/*
 * stubs that should not be reached
 */
extern "C" {
void l1if_pdch_req() { abort(); }
void l1if_connect_pdch() { abort(); }
void l1if_close_pdch() { abort(); }
void l1if_open_pdch() { abort(); }
}