/**
 *
 * \section COPYRIGHT
 *
 * Copyright 2013-2014 The libLTE Developers. See the
 * COPYRIGHT file at the top-level directory of this distribution.
 *
 * \section LICENSE
 *
 * This file is part of the libLTE library.
 *
 * libLTE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * libLTE 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 Lesser General Public License for more details.
 *
 * A copy of the GNU Lesser General Public License can be found in
 * the LICENSE file in the top-level directory of this distribution
 * and at http://www.gnu.org/licenses/.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <math.h>
#include <time.h>
#include <stdbool.h>

#include "lte.h"

int nof_symbols = 1000;
int nof_cw = 1, nof_layers = 1;
char *mimo_type_name = NULL;

void usage(char *prog) {
	printf("Usage: %s -m [single|diversity|multiplex] -c [nof_cw] -l [nof_layers]\n", prog);
	printf("\t-n num_symbols [Default %d]\n", nof_symbols);
}

void parse_args(int argc, char **argv) {
	int opt;
	while ((opt = getopt(argc, argv, "mcln")) != -1) {
		switch (opt) {
		case 'n':
			nof_symbols = atoi(argv[optind]);
			break;
		case 'c':
			nof_cw = atoi(argv[optind]);
			break;
		case 'l':
			nof_layers = atoi(argv[optind]);
			break;
		case 'm':
			mimo_type_name = argv[optind];
			break;
		default:
			usage(argv[0]);
			exit(-1);
		}
	}
	if (!mimo_type_name) {
		usage(argv[0]);
		exit(-1);
	}
}

int main(int argc, char **argv) {
	int i, j, num_errors, symbols_layer;
	cf_t *d[MAX_CODEWORDS], *x[MAX_LAYERS], *dp[MAX_CODEWORDS];
	mimo_type_t type;
	int nof_symb_cw[MAX_CODEWORDS];
	int n[2];

	parse_args(argc, argv);

	if (lte_str2mimotype(mimo_type_name, &type)) {
		fprintf(stderr, "Invalid MIMO type %s\n", mimo_type_name);
		exit(-1);
	}

	if (nof_cw > 1) {
		n[0] = nof_layers / nof_cw;
		n[1] = nof_layers - n[0];
		nof_symb_cw[0] = nof_symbols * n[0];
		nof_symb_cw[1] = nof_symbols * n[1];
	} else {
		nof_symb_cw[0] = nof_symbols;
		nof_symb_cw[1] = 0;
	}

	for (i=0;i<nof_cw;i++) {
		d[i] = malloc(sizeof(cf_t) * nof_symb_cw[i]);
		if (!d[i]) {
			perror("malloc");
			exit(-1);
		}
		dp[i] = malloc(sizeof(cf_t) * nof_symb_cw[i]);
		if (!dp[i]) {
			perror("malloc");
			exit(-1);
		}
	}
	for (i=0;i<nof_layers;i++) {
		x[i] = malloc(sizeof(cf_t) * nof_symbols);
		if (!x[i]) {
			perror("malloc");
			exit(-1);
		}
	}

	/* generate random data */
	for (i=0;i<nof_cw;i++) {
		for (j=0;j<nof_symb_cw[i];j++) {
			d[i][j] = 100 * (rand()/RAND_MAX + I*rand()/RAND_MAX);
		}
	}

	/* layer mapping */
	if ((symbols_layer = layermap_type(d, x, nof_cw, nof_layers, nof_symb_cw, type)) < 0) {
		fprintf(stderr, "Error layer mapper encoder\n");
		exit(-1);
	}

	/* layer de-mapping */
	if (layerdemap_type(x, dp, nof_layers, nof_cw, nof_symbols/nof_layers, nof_symb_cw, type) < 0) {
		fprintf(stderr, "Error layer mapper encoder\n");
		exit(-1);
	}

	/* check errors */
	num_errors = 0;
	for (i=0;i<nof_cw;i++) {
		for (j=0;j<nof_symb_cw[i];j++) {
			if (d[i][j] != dp[i][j]) {
				num_errors++;
			}
		}
	}

	for (i=0;i<nof_cw;i++) {
		free(d[i]);
		free(dp[i]);
	}
	for (i=0;i<nof_layers;i++) {
		free(x[i]);
	}

	if (num_errors) {
		printf("%d Errors\n", num_errors);
		exit(-1);
	} else {
		printf("Ok\n");
		exit(0);
	}
}