/**
 *
 * \section COPYRIGHT
 *
 * Copyright 2013-2015 The srsLTE Developers. See the
 * COPYRIGHT file at the top-level directory of this distribution.
 *
 * \section LICENSE
 *
 * This file is part of the srsLTE library.
 *
 * srsLTE 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.
 *
 * srsLTE 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 Affero General Public License for more details.
 *
 * A copy of the GNU Affero 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 "srslte/srslte.h"


int nof_e_bits = -1;
int rv_idx = -1;
int cb_idx = -1; 

uint8_t systematic[6148], parity[2*6148];
uint8_t systematic_bytes[6148/8+1], parity_bytes[2*6148/8+1];

#define BUFFSZ 6176*3

uint8_t bits[3*6144+12];
uint8_t buff_b[BUFFSZ];
float buff_f[BUFFSZ];
float bits_f[3*6144+12];
float bits2_f[3*6144+12];

void usage(char *prog) {
  printf("Usage: %s -c cb_idx -e nof_e_bits [-i rv_idx]\n", prog);
}

void parse_args(int argc, char **argv) {
  int opt;
  while ((opt = getopt(argc, argv, "cei")) != -1) {
    switch (opt) {
    case 'c':
      cb_idx = atoi(argv[optind]);
      break;
    case 'e':
      nof_e_bits = atoi(argv[optind]);
      break;
    case 'i':
      rv_idx = atoi(argv[optind]);
      break;
    default:
      usage(argv[0]);
      exit(-1);
    }
  }
  if (nof_e_bits == -1) {
    usage(argv[0]);
    exit(-1);
  }
}


int main(int argc, char **argv) {
  int i;
  uint8_t *rm_bits, *rm_bits2, *rm_bits2_bytes;
  float *rm_bits_f; 
  
  parse_args(argc, argv);
  
  srslte_rm_turbo_gentables();

  rm_bits_f = malloc(sizeof(float) * nof_e_bits);
  if (!rm_bits_f) {
    perror("malloc");
    exit(-1);
  }
  rm_bits = malloc(sizeof(uint8_t) * nof_e_bits);
  if (!rm_bits) {
    perror("malloc");
    exit(-1);
  }
  rm_bits2 = malloc(sizeof(uint8_t) * nof_e_bits);
  if (!rm_bits2) {
    perror("malloc");
    exit(-1);
  }
  rm_bits2_bytes = malloc(sizeof(uint8_t) * nof_e_bits/8 + 1);
  if (!rm_bits2_bytes) {
    perror("malloc");
    exit(-1);
  }

  uint32_t st=0, end=188;
  if (cb_idx != -1) {
    st=cb_idx;
    end=cb_idx+1;
  }
  uint32_t rv_st=0, rv_end=4;
  if (rv_idx != -1) {
    rv_st=rv_idx;
    rv_end=rv_idx+1;
  }
  
  for (cb_idx=st;cb_idx<end;cb_idx++) {
    for (rv_idx=rv_st;rv_idx<rv_end;rv_idx++) {
      uint32_t long_cb_enc = 3*srslte_cbsegm_cbsize(cb_idx)+12;
      
      printf("checking cb_idx=%3d rv_idx=%d...", cb_idx, rv_idx);
      
      for (i = 0; i < long_cb_enc; i++) {
        bits[i] = rand() % 2;
      }
      
      bzero(buff_b, BUFFSZ * sizeof(uint8_t));
      
      srslte_rm_turbo_tx(buff_b, BUFFSZ, bits, long_cb_enc, rm_bits, nof_e_bits, 0);

      if (rv_idx > 0) {
        srslte_rm_turbo_tx(buff_b, BUFFSZ, bits, long_cb_enc, rm_bits, nof_e_bits, rv_idx);
      }

      for (int i=0;i<long_cb_enc/3;i++) {
        systematic[i] = bits[3*i];
        parity[i] = bits[3*i+1];
        parity[i+long_cb_enc/3] = bits[3*i+2];
      }
      
      srslte_bit_pack_vector(systematic, systematic_bytes, long_cb_enc/3);
      srslte_bit_pack_vector(parity, parity_bytes, 2*long_cb_enc/3);
      
      bzero(buff_b, BUFFSZ * sizeof(uint8_t));

      bzero(rm_bits2_bytes, nof_e_bits/8);
      srslte_rm_turbo_tx_lut(buff_b, systematic_bytes, parity_bytes, rm_bits2_bytes, cb_idx, nof_e_bits, 0, 0);
      if (rv_idx > 0) {
        bzero(rm_bits2_bytes, nof_e_bits/8);
        srslte_rm_turbo_tx_lut(buff_b, systematic_bytes, parity_bytes, rm_bits2_bytes, cb_idx, nof_e_bits, 0, rv_idx);
      }

      srslte_bit_unpack_vector(rm_bits2_bytes, rm_bits2, nof_e_bits);
      
      for (int i=0;i<nof_e_bits;i++) {
        if (rm_bits2[i] != rm_bits[i]) {
          printf("Error in TX bit %d\n", i);
          exit(-1);
        }
      }
      
      printf("OK TX...");
      
      for (int i=0;i<nof_e_bits;i++) {
        rm_bits_f[i] = rand()%10-5;
      }

      bzero(buff_f, BUFFSZ*sizeof(float));

      srslte_rm_turbo_rx(buff_f, BUFFSZ, rm_bits_f, nof_e_bits, bits_f, long_cb_enc, rv_idx, 0);
      
      bzero(bits2_f, long_cb_enc*sizeof(float));
      srslte_rm_turbo_rx_lut(rm_bits_f, bits2_f, nof_e_bits, cb_idx, rv_idx);
      
      for (int i=0;i<long_cb_enc;i++) {
        if (bits_f[i] != bits2_f[i]) {
          printf("error RX in bit %d %f!=%f\n", i, bits_f[i], bits2_f[i]);
          exit(-1);
        }
      }
    
      printf("OK RX\n");

    }
  }

  free(rm_bits);
  free(rm_bits2);
  free(rm_bits2_bytes);
  
  exit(0);
}