/**
 *
 * \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 "srslte/srslte.h"


srslte_cell_t cell = {
  6,            // nof_prb
  1,            // nof_ports
  1000,         // cell_id
  SRSLTE_SRSLTE_CP_NORM,       // cyclic prefix
  SRSLTE_PHICH_R_1,          // PHICH resources      
  SRSLTE_PHICH_NORM    // PHICH length
};

void usage(char *prog) {
  printf("Usage: %s [cpv]\n", prog);
  printf("\t-c cell id [Default %d]\n", cell.id);
  printf("\t-p nof_ports [Default %d]\n", cell.nof_ports);
  printf("\t-n nof_prb [Default %d]\n", cell.nof_prb);
  printf("\t-v [set srslte_verbose to debug, default none]\n");
}

void parse_args(int argc, char **argv) {
  int opt;
  while ((opt = getopt(argc, argv, "cpnv")) != -1) {
    switch(opt) {
    case 'p':
      cell.nof_ports = atoi(argv[optind]);
      break;
    case 'n':
      cell.nof_prb = atoi(argv[optind]);
      break;
    case 'c':
      cell.id = atoi(argv[optind]);
      break;
    case 'v':
      srslte_verbose++;
      break;
    default:
      usage(argv[0]);
      exit(-1);
    }
  }
}


int main(int argc, char **argv) {
  srslte_pcfich_t pcfich;
  srslte_regs_t regs;
  int i, j;
  cf_t *ce[SRSLTE_MAX_PORTS];
  int nof_re;
  cf_t *slot_symbols[SRSLTE_MAX_PORTS];
  uint32_t cfi, cfi_rx, nsf;
  int cid, max_cid;
  float corr_res; 

  parse_args(argc,argv);

  nof_re = SRSLTE_SRSLTE_SRSLTE_CP_NORM_NSYMB * cell.nof_prb * SRSLTE_NRE;

  /* init memory */
  for (i=0;i<SRSLTE_MAX_PORTS;i++) {
    ce[i] = malloc(sizeof(cf_t) * nof_re);
    if (!ce[i]) {
      perror("malloc");
      exit(-1);
    }
    for (j=0;j<nof_re;j++) {
      ce[i][j] = 1;
    }
    slot_symbols[i] = malloc(sizeof(cf_t) * nof_re);
    if (!slot_symbols[i]) {
      perror("malloc");
      exit(-1);
    }
  }

  if (cell.id == 1000) {
    cid = 0;
    max_cid = 503;
  } else {
    cid = cell.id;
    max_cid = cell.id;
  }
  
  while(cid <= max_cid) {
    cell.id = cid;

    printf("Testing CellID=%d...\n", cid);

    if (srslte_regs_init(&regs, cell)) {
      fprintf(stderr, "Error initiating regs\n");
      exit(-1);
    }

    if (srslte_pcfich_init(&pcfich, &regs, cell)) {
      fprintf(stderr, "Error creating PBCH object\n");
      exit(-1);
    }

    for (nsf=0;nsf<10;nsf++) {
      for (cfi=1;cfi<4;cfi++) {
        srslte_pcfich_encode(&pcfich, cfi, slot_symbols, nsf);

        /* combine outputs */
        for (i=1;i<cell.nof_ports;i++) {
          for (j=0;j<nof_re;j++) {
            slot_symbols[0][j] += slot_symbols[i][j];
          }
        }
        if (srslte_pcfich_decode(&pcfich, slot_symbols[0], ce, 0, nsf, &cfi_rx, &corr_res)<0) {
          exit(-1);
        }
        INFO("cfi_tx: %d, cfi_rx: %d, ns: %d, distance: %f\n",
            cfi, cfi_rx, nsf, corr_res);
      }
    }
    srslte_pcfich_free(&pcfich);
    srslte_regs_free(&regs);
    cid++;
  }

  for (i=0;i<SRSLTE_MAX_PORTS;i++) {
    free(ce[i]);
    free(slot_symbols[i]);
  }
  printf("OK\n");
  exit(0);
}