/* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
 * (C) 2015 by Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
 *
 * 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/>.
 *
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#include <osmocom/core/bits.h>
#include <osmocom/core/utils.h>

#include "../../src/osmo-bts-trx/gsm0503_coding.h"

#include <osmo-bts/logging.h>

#define ASSERT_TRUE(rc) \
	if (!(rc)) { \
		printf("Assert failed in %s:%d.\n",  \
		       __FILE__, __LINE__);          \
		abort();			     \
	}

/* set condition to 1, to show debugging */
#define printd if (0) printf

static int ubits2sbits(ubit_t *ubits, sbit_t *sbits, int count)
{
	int i;

	for (i = 0; i < count; i++) {
		if (*ubits == 0x23) {
			ubits++;
			sbits++;
			continue;
		}
		if ((*ubits++) & 1)
			*sbits++ = -127;
		else
			*sbits++ = 127;
	}

	return count;
}

static void test_xcch(uint8_t *l2)
{
	uint8_t result[23];
	ubit_t bursts_u[116 * 4];
	sbit_t bursts_s[116 * 4];
	int n_errors, n_bits_total;

	printd("Encoding: %s\n", osmo_hexdump(l2, 23));

	/* encode */
	xcch_encode(bursts_u, l2);

	printd("U-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u, 57),
		bursts_u[57], bursts_u[58]);
	printd("%s\n", osmo_hexdump(bursts_u + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 116, 57),
		bursts_u[57 + 116], bursts_u[58 + 116]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 232, 57),
		bursts_u[57 + 232], bursts_u[58 + 232]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 348, 57),
		bursts_u[57 + 348], bursts_u[58 + 348]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 348, 57));
	ubits2sbits(bursts_u, bursts_s, 116 * 4);
	printd("S-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s, 57),
		(uint8_t)bursts_s[57], (uint8_t)bursts_s[58]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 116, 57),
		(uint8_t)bursts_s[57 + 116], (uint8_t)bursts_s[58 + 116]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 232, 57),
		(uint8_t)bursts_s[57 + 232], (uint8_t)bursts_s[58 + 232]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 348, 57),
		(uint8_t)bursts_s[57 + 348], (uint8_t)bursts_s[58 + 348]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 348, 57));

	/* destroy */
	memset(bursts_s, 0, 30);
	memset(bursts_s + 116, 0, 30);

	/* decode */
	xcch_decode(result, bursts_s, &n_errors, &n_bits_total);

	ASSERT_TRUE(n_bits_total == 456);

	printd("Decoded: %s\n", osmo_hexdump(result, 23));
	printf("xcch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
		n_errors, n_bits_total, (float)n_errors/n_bits_total);

	ASSERT_TRUE(!memcmp(l2, result, 23));

	printd("\n");
}

static void test_rach(uint8_t bsic, uint8_t ra)
{
	uint8_t result;
	ubit_t bursts_u[36];
	sbit_t bursts_s[36];

	printd("Encoding: %02x\n", ra);

	/* encode */
	rach_encode(bursts_u, &ra, bsic);

	printd("U-Bits:\n");
	printd("%s\n", osmo_hexdump(bursts_u, 36));
	ubits2sbits(bursts_u, bursts_s, 36);
	printd("S-Bits:\n");
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s, 36));

	/* destroy */
	memset(bursts_s + 6, 0, 8);

	/* decode */
	rach_decode(&result, bursts_s, bsic);

	printd("Decoded: %02x\n", result);

	ASSERT_TRUE(ra == result);

	printd("\n");
}

static void test_sch(uint8_t *info)
{
	uint8_t result[4];
	ubit_t bursts_u[78];
	sbit_t bursts_s[78];

	/* zero bits 25 and above */
	info[3] &= 1;
	result[3] = 0;

	printd("Encoding: %s\n", osmo_hexdump(info, 4));

	/* encode */
	sch_encode(bursts_u, info);

	printd("U-Bits:\n");
	printd("%s\n", osmo_hexdump(bursts_u, 78));
	ubits2sbits(bursts_u, bursts_s, 78);
	printd("S-Bits:\n");
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s, 78));

	/* destroy */
	memset(bursts_s + 6, 0, 10);

	/* decode */
	sch_decode(result, bursts_s);

	printd("Decoded: %s\n", osmo_hexdump(result, 4));

	ASSERT_TRUE(!memcmp(info, result, 4));

	printd("\n");
}

static void test_fr(uint8_t *speech, int len)
{
	uint8_t result[33];
	ubit_t bursts_u[116 * 8];
	sbit_t bursts_s[116 * 8];
	int n_errors, n_bits_total;
	int rc;

	memset(bursts_u, 0x23, sizeof(bursts_u));
	memset(bursts_s, 0, sizeof(bursts_s));

	printd("Encoding: %s\n", osmo_hexdump(speech, len));

	/* encode */
	tch_fr_encode(bursts_u, speech, len, 1);

	printd("U-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u, 57),
		bursts_u[57], bursts_u[58]);
	printd("%s\n", osmo_hexdump(bursts_u + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 116, 57),
		bursts_u[57 + 116], bursts_u[58 + 116]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 232, 57),
		bursts_u[57 + 232], bursts_u[58 + 232]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 348, 57),
		bursts_u[57 + 348], bursts_u[58 + 348]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 348, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 464, 57),
		bursts_u[57 + 464], bursts_u[58 + 464]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 464, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 580, 57),
		bursts_u[57 + 580], bursts_u[58 + 580]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 580, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 696, 57),
		bursts_u[57 + 696], bursts_u[58 + 696]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 696, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 812, 57),
		bursts_u[57 + 812], bursts_u[58 + 812]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 812, 57));
	ubits2sbits(bursts_u, bursts_s, 116 * 8);
	printd("S-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s, 57),
		(uint8_t)bursts_s[57], (uint8_t)bursts_s[58]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 116, 57),
		(uint8_t)bursts_s[57 + 116], (uint8_t)bursts_s[58 + 116]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 232, 57),
		(uint8_t)bursts_s[57 + 232], (uint8_t)bursts_s[58 + 232]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 348, 57),
		(uint8_t)bursts_s[57 + 348], (uint8_t)bursts_s[58 + 348]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 348, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 464, 57),
		(uint8_t)bursts_s[57 + 464], (uint8_t)bursts_s[58 + 464]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 464, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 580, 57),
		(uint8_t)bursts_s[57 + 580], (uint8_t)bursts_s[58 + 580]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 580, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 696, 57),
		(uint8_t)bursts_s[57 + 696], (uint8_t)bursts_s[58 + 696]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 696, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 812, 57),
		(uint8_t)bursts_s[57 + 812], (uint8_t)bursts_s[58 + 812]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 812, 57));

	/* destroy */
	memset(bursts_s + 6, 0, 20);

	/* decode */
	rc = tch_fr_decode(result, bursts_s, 1, len == 31, &n_errors, &n_bits_total);

	ASSERT_TRUE(rc == len);

	printd("Decoded: %s\n", osmo_hexdump(result, len));
	printf("tch_fr_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
		n_errors, n_bits_total, (float)n_errors/n_bits_total);

	ASSERT_TRUE(!memcmp(speech, result, len));

	printd("\n");
}

static void test_hr(uint8_t *speech, int len)
{
	uint8_t result[23];
	ubit_t bursts_u[116 * 6];
	sbit_t bursts_s[116 * 6];
	int n_errors, n_bits_total;
	int rc;

	memset(bursts_u, 0x23, sizeof(bursts_u));
	memset(bursts_s, 0, sizeof(bursts_s));

	printd("Encoding: %s\n", osmo_hexdump(speech, len));

	/* encode */
	tch_hr_encode(bursts_u, speech, len);

	printd("U-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u, 57),
		bursts_u[57], bursts_u[58]);
	printd("%s\n", osmo_hexdump(bursts_u + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 116, 57),
		bursts_u[57 + 116], bursts_u[58 + 116]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 232, 57),
		bursts_u[57 + 232], bursts_u[58 + 232]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 348, 57),
		bursts_u[57 + 348], bursts_u[58 + 348]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 348, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 464, 57),
		bursts_u[57 + 464], bursts_u[58 + 464]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 464, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 580, 57),
		bursts_u[57 + 580], bursts_u[58 + 580]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 580, 57));
	ubits2sbits(bursts_u, bursts_s, 116 * 6);
	printd("S-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s, 57),
		(uint8_t)bursts_s[57], (uint8_t)bursts_s[58]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 116, 57),
		(uint8_t)bursts_s[57 + 116], (uint8_t)bursts_s[58 + 116]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 232, 57),
		(uint8_t)bursts_s[57 + 232], (uint8_t)bursts_s[58 + 232]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 348, 57),
		(uint8_t)bursts_s[57 + 348], (uint8_t)bursts_s[58 + 348]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 348, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 464, 57),
		(uint8_t)bursts_s[57 + 464], (uint8_t)bursts_s[58 + 464]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 464, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 580, 57),
		(uint8_t)bursts_s[57 + 580], (uint8_t)bursts_s[58 + 580]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 580, 57));

	/* destroy */
	memset(bursts_s + 6, 0, 20);

	/* decode */
	rc = tch_hr_decode(result, bursts_s, 0, &n_errors, &n_bits_total);

	ASSERT_TRUE(rc == len);

	printd("Decoded: %s\n", osmo_hexdump(result, len));
	printf("tch_hr_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
		n_errors, n_bits_total, (float)n_errors/n_bits_total);

	ASSERT_TRUE(!memcmp(speech, result, len));

	printd("\n");
}

static void test_pdtch(uint8_t *l2, int len)
{
	uint8_t result[len];
	ubit_t bursts_u[116 * 4];
	sbit_t bursts_s[116 * 4];
	int n_errors, n_bits_total;
	int rc;

	/* zero the not coded tail bits */
	switch (len) {
	case 34:
	case 54:
		l2[len - 1] &= 0x7f;
		result[len - 1] &= 0x7f;
		break;
	case 40:
		l2[len - 1] &= 0x07;
		result[len - 1] &= 0x07;
		break;
	}

	printd("Encoding: %s\n", osmo_hexdump(l2, len));

	/* encode */
	pdtch_encode(bursts_u, l2, len);

	printd("U-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u, 57),
		bursts_u[57], bursts_u[58]);
	printd("%s\n", osmo_hexdump(bursts_u + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 116, 57),
		bursts_u[57 + 116], bursts_u[58 + 116]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 232, 57),
		bursts_u[57 + 232], bursts_u[58 + 232]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump(bursts_u + 348, 57),
		bursts_u[57 + 348], bursts_u[58 + 348]);
	printd("%s\n", osmo_hexdump(bursts_u + 59 + 348, 57));
	ubits2sbits(bursts_u, bursts_s, 116 * 4);
	printd("S-Bits:\n");
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s, 57),
		(uint8_t)bursts_s[57], (uint8_t)bursts_s[58]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 116, 57),
		(uint8_t)bursts_s[57 + 116], (uint8_t)bursts_s[58 + 116]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 116, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 232, 57),
		(uint8_t)bursts_s[57 + 232], (uint8_t)bursts_s[58 + 232]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 232, 57));
	printd("%s %02x  %02x  ", osmo_hexdump((uint8_t *)bursts_s + 348, 57),
		(uint8_t)bursts_s[57 + 348], (uint8_t)bursts_s[58 + 348]);
	printd("%s\n", osmo_hexdump((uint8_t *)bursts_s + 59 + 348, 57));

	/* decode */
	rc = pdtch_decode(result, bursts_s, NULL, &n_errors, &n_bits_total);

	ASSERT_TRUE(rc == len);

	printd("Decoded: %s\n", osmo_hexdump(result, len));
	printf("pdtch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
		n_errors, n_bits_total, (float)n_errors/n_bits_total);

	ASSERT_TRUE(!memcmp(l2, result, len));

	printd("\n");
}

uint8_t test_l2[][23] = {
	/* dummy frame */
	{ 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
	/* random frame */
	{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
	0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
	0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8 },
	/* jolly frame */
	{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
	0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
	0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};

uint8_t test_macblock[][54] = {
	/* random frame */
	{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
	0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
	0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
	0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
	0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
	0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
	0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 },
	/* jolly frame */
	{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
	0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
	0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};

uint8_t test_speech_fr[33];
uint8_t test_speech_efr[31];
uint8_t test_speech_hr[15];

int main(int argc, char **argv)
{
	int i;

	bts_log_init(NULL);

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_xcch(test_l2[i]);

	for (i = 0; i < 256; i++) {
		test_rach(0x3f, i);
		test_rach(0x00, i);
		test_rach(0x1a, i);
	}

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_sch(test_l2[i]);

	for (i = 0; i < sizeof(test_speech_fr); i++)
		test_speech_fr[i] = i;
	test_speech_fr[0] = 0xd0;
	test_fr(test_speech_fr, sizeof(test_speech_fr));

	for (i = 0; i < sizeof(test_speech_efr); i++)
		test_speech_efr[i] = i;
	test_speech_efr[0] = 0xc0;
	test_fr(test_speech_efr, sizeof(test_speech_efr));

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_fr(test_l2[i], sizeof(test_l2[0]));

	for (i = 0; i < sizeof(test_speech_hr); i++)
		test_speech_hr[i] = i*17;
	test_speech_hr[0] = 0x00;
	test_hr(test_speech_hr, sizeof(test_speech_hr));

	for (i = 0; i < sizeof(test_l2) / sizeof(test_l2[0]); i++)
		test_hr(test_l2[i], sizeof(test_l2[0]));

	for (i = 0; i < sizeof(test_macblock) / sizeof(test_macblock[0]); i++) {
		test_pdtch(test_macblock[i], 23);
		test_pdtch(test_macblock[i], 34);
		test_pdtch(test_macblock[i], 40);
		test_pdtch(test_macblock[i], 54);
	}

	printf("Success\n");

	return 0;
}