/*
 * LlcTest.cpp
 *
 * Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
 *
 * 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/linuxlist.h>
}

#include "llc.h"
#include "gprs_debug.h"

extern "C" {
#include "pcu_vty.h"

#include <osmocom/core/application.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/vty/vty.h>
}


void *tall_pcu_ctx;
int16_t spoof_mnc = 0, spoof_mcc = 0;

static void enqueue_data(gprs_llc_queue *queue, const uint8_t *data, size_t len,
	gprs_llc_queue::MetaInfo *info = 0)
{
	struct timeval *tv;
	uint8_t *msg_data;
	struct msgb *llc_msg = msgb_alloc(len + sizeof(*tv) * 2,
		"llc_pdu_queue");

	msg_data = (uint8_t *)msgb_put(llc_msg, len);

	memcpy(msg_data, data, len);

	queue->enqueue(llc_msg, info);
}

static void dequeue_and_check(gprs_llc_queue *queue, const uint8_t *exp_data,
	size_t len, const gprs_llc_queue::MetaInfo *exp_info = 0)
{
	struct msgb *llc_msg;
	uint8_t *msg_data;
	const gprs_llc_queue::MetaInfo *info_res;

	llc_msg = queue->dequeue(&info_res);
	OSMO_ASSERT(llc_msg != NULL);

	fprintf(stderr, "dequeued msg, length %u (expected %zu), data %s\n",
		msgb_length(llc_msg), len, msgb_hexdump(llc_msg));

	OSMO_ASSERT(msgb_length(llc_msg) == len);
	msg_data = msgb_data(llc_msg);

	OSMO_ASSERT(memcmp(msg_data, exp_data, len) == 0);

	if (exp_info)
		OSMO_ASSERT(memcmp(exp_info, info_res, sizeof(*exp_info)) == 0);

	msgb_free(llc_msg);
}

static void enqueue_data(gprs_llc_queue *queue, const char *message,
	gprs_llc_queue::MetaInfo *info = 0)
{
	enqueue_data(queue, (uint8_t *)(message), strlen(message), info);
}

static void dequeue_and_check(gprs_llc_queue *queue, const char *exp_message,
	const gprs_llc_queue::MetaInfo *exp_info = 0)
{
	dequeue_and_check(queue,
		(uint8_t *)(exp_message), strlen(exp_message), exp_info);
}

static void test_llc_queue()
{
	gprs_llc_queue queue;

	printf("=== start %s ===\n", __func__);

	queue.init();
	OSMO_ASSERT(queue.size() == 0);
	OSMO_ASSERT(queue.octets() == 0);

	enqueue_data(&queue, "LLC message");
	OSMO_ASSERT(queue.size() == 1);
	OSMO_ASSERT(queue.octets() == 11);

	enqueue_data(&queue, "other LLC message");
	OSMO_ASSERT(queue.size() == 2);
	OSMO_ASSERT(queue.octets() == 28);

	dequeue_and_check(&queue, "LLC message");
	OSMO_ASSERT(queue.size() == 1);
	OSMO_ASSERT(queue.octets() == 17);

	dequeue_and_check(&queue, "other LLC message");
	OSMO_ASSERT(queue.size() == 0);
	OSMO_ASSERT(queue.octets() == 0);

	enqueue_data(&queue, "LLC");
	OSMO_ASSERT(queue.size() == 1);
	OSMO_ASSERT(queue.octets() == 3);

	queue.clear(NULL);
	OSMO_ASSERT(queue.size() == 0);
	OSMO_ASSERT(queue.octets() == 0);

	printf("=== end %s ===\n", __func__);
}

static void test_llc_meta()
{
	gprs_llc_queue queue;
	gprs_llc_queue::MetaInfo info1;
	gprs_llc_queue::MetaInfo info2;

	info1.recv_time.tv_sec    = 123456777;
	info1.recv_time.tv_usec   = 123456;
	info1.expire_time.tv_sec  = 123456789;
	info1.expire_time.tv_usec = 987654;

	info2.recv_time.tv_sec    = 987654321;
	info2.recv_time.tv_usec   = 547352;
	info2.expire_time.tv_sec  = 987654327;
	info2.expire_time.tv_usec = 867252;

	printf("=== start %s ===\n", __func__);

	queue.init();
	OSMO_ASSERT(queue.size() == 0);
	OSMO_ASSERT(queue.octets() == 0);

	enqueue_data(&queue, "LLC message 1", &info1);
	enqueue_data(&queue, "LLC message 2", &info2);

	dequeue_and_check(&queue, "LLC message 1", &info1);
	dequeue_and_check(&queue, "LLC message 2", &info2);

	queue.clear(NULL);
	OSMO_ASSERT(queue.size() == 0);
	OSMO_ASSERT(queue.octets() == 0);

	printf("=== end %s ===\n", __func__);
}

static void test_llc_merge()
{
	gprs_llc_queue queue1;
	gprs_llc_queue queue2;
	gprs_llc_queue::MetaInfo info = {0};

	printf("=== start %s ===\n", __func__);

	queue1.init();
	queue2.init();

	info.recv_time.tv_sec += 1;
	enqueue_data(&queue1, "*A*", &info);

	info.recv_time.tv_sec += 1;
	enqueue_data(&queue1, "*B*", &info);

	info.recv_time.tv_sec += 1;
	enqueue_data(&queue2, "*C*", &info);

	info.recv_time.tv_sec += 1;
	enqueue_data(&queue1, "*D*", &info);

	info.recv_time.tv_sec += 1;
	enqueue_data(&queue2, "*E*", &info);

	OSMO_ASSERT(queue1.size() == 3);
	OSMO_ASSERT(queue1.octets() == 9);
	OSMO_ASSERT(queue2.size() == 2);
	OSMO_ASSERT(queue2.octets() == 6);

	queue2.move_and_merge(&queue1);

	OSMO_ASSERT(queue1.size() == 0);
	OSMO_ASSERT(queue1.octets() == 0);
	OSMO_ASSERT(queue2.size() == 5);
	OSMO_ASSERT(queue2.octets() == 15);

	dequeue_and_check(&queue2, "*A*");
	dequeue_and_check(&queue2, "*B*");
	dequeue_and_check(&queue2, "*C*");
	dequeue_and_check(&queue2, "*D*");
	dequeue_and_check(&queue2, "*E*");

	OSMO_ASSERT(queue2.size() == 0);
	OSMO_ASSERT(queue2.octets() == 0);

	printf("=== end %s ===\n", __func__);
}

static const struct log_info_cat default_categories[] = {
	{"DPCU", "", "GPRS Packet Control Unit (PCU)", LOGL_INFO, 1},
};

static int filter_fn(const struct log_context *ctx,
	struct log_target *tar)
{
	return 1;
}

const struct log_info debug_log_info = {
	filter_fn,
	(struct log_info_cat*)default_categories,
	ARRAY_SIZE(default_categories),
};

int main(int argc, char **argv)
{
	struct vty_app_info pcu_vty_info = {0};

	tall_pcu_ctx = talloc_named_const(NULL, 1, "LlcTest context");
	if (!tall_pcu_ctx)
		abort();

	msgb_talloc_ctx_init(tall_pcu_ctx, 0);
	osmo_init_logging(&debug_log_info);
	log_set_use_color(osmo_stderr_target, 0);
	log_set_print_filename(osmo_stderr_target, 0);
	log_set_log_level(osmo_stderr_target, LOGL_INFO);

	vty_init(&pcu_vty_info);
	pcu_vty_init(&debug_log_info);

	test_llc_queue();
	test_llc_meta();
	test_llc_merge();

	if (getenv("TALLOC_REPORT_FULL"))
		talloc_report_full(tall_pcu_ctx, stderr);

	return EXIT_SUCCESS;
}

extern "C" {
void l1if_pdch_req() { abort(); }
void l1if_connect_pdch() { abort(); }
void l1if_close_pdch() { abort(); }
void l1if_open_pdch() { abort(); }
}