/*---------------------------------------------------------------------------*\

  FILE........: freedv_data_raw_rx.c
  AUTHOR......: David Rowe
  DATE CREATED: May 2020

  Demonstrates receiving frames of raw data bytes (instead of
  compressed speech) using the FreeDV API.

\*---------------------------------------------------------------------------*/

/*
  Copyright (C) 2020 David Rowe

  All rights reserved.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License version 2.1, as
  published by the Free Software Foundation.  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 Lesser General Public License
  along with this program; if not, see <http://www.gnu.org/licenses/>.
*/

#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "freedv_api.h"
#include "fsk.h"
#include "ldpc_codes.h"
#include "modem_stats.h"
#include "octave.h"

/* other processes can end this program using signals */

static volatile int finish = 0;
void INThandler(int sig) {
  fprintf(stderr, "signal received: %d\n", sig);
  finish = 1;
}

int main(int argc, char *argv[]) {
  FILE *fin, *fout;
  char codename[80] = "H_256_512_4";
  struct freedv_advanced adv = {0, 2, 100, 8000, 1000, 200, codename};
  struct freedv *freedv;
  int nin, nbytes, nbytes_out = 0, nframes_out = 0, buf = 0;
  int mode;
  int verbose = 0, use_testframes = 0;
  int mask = 0;
  int framesperburst = 1;
  FILE *foct = NULL;
  int quiet = 0;
  int single_line_summary = 0;
  float snr_sum = 0.0;
  int fsk_lower = 0, fsk_upper = 0;
  int user_fsk_lower = 0, user_fsk_upper = 0;

  int o = 0;
  int opt_idx = 0;
  while (o != -1) {
    static struct option long_opts[] = {
        {"testframes", no_argument, 0, 't'},
        {"help", no_argument, 0, 'h'},
        {"Fs", required_argument, 0, 'f'},
        {"Rs", required_argument, 0, 'r'},
        {"shift", required_argument, 0, 's'},
        {"vv", no_argument, 0, 'x'},
        {"vvv", no_argument, 0, 'y'},
        {"mask", required_argument, 0, 'k'},
        {"framesperburst", required_argument, 0, 'g'},
        {"scatter", required_argument, 0, 'c'},
        {"quiet", required_argument, 0, 'q'},
        {"singleline", no_argument, 0, 'b'},
        {"fsk_lower", required_argument, 0, 'l'},
        {"fsk_upper", required_argument, 0, 'u'},
        {"code", required_argument, 0, 'o'},
        {"listcodes", no_argument, 0, 'i'},
        {0, 0, 0, 0}};

    o = getopt_long(argc, argv, "bf:hm:qr:tvx", long_opts, &opt_idx);

    switch (o) {
      case 'b':
        single_line_summary = 1;
        break;
      case 'c':
        foct = fopen(optarg, "wt");
        assert(foct != NULL);
        break;
      case 'f':
        adv.Fs = atoi(optarg);
        break;
      case 'k':
        mask = 1;
        adv.tone_spacing = atoi(optarg);
        break;
      case 'm':
        adv.M = atoi(optarg);
        break;
      case 'l':
        fsk_lower = atoi(optarg);
        user_fsk_lower = 1;
        break;
      case 'u':
        fsk_upper = atoi(optarg);
        user_fsk_upper = 1;
        break;
      case 'q':
        quiet = 1;
        break;
      case 'r':
        adv.Rs = atoi(optarg);
        break;
      case 's':
        adv.tone_spacing = atoi(optarg);
        break;
      case 'g':
        framesperburst = atoi(optarg);
        break;
      case 't':
        use_testframes = 1;
        break;
      case 'v':
        verbose = 1;
        break;
      case 'x':
        verbose = 2;
        break;
      case 'y':
        verbose = 3;
        break;
      case 'o':
        if (ldpc_codes_find(optarg) == -1) {
          fprintf(stderr, "%s not found, try --listcodes\n", optarg);
          exit(1);
        }
        strcpy(codename, optarg);
        break;
      case 'i':
        ldpc_codes_list();
        exit(0);
        break;
      case 'h':
      case '?':
        goto helpmsg;
        break;
    }
  }
  int dx = optind;

  if (argc < 3) {
  helpmsg:
    fprintf(
        stderr,
        "\nusage: %s [options] FSK_LDPC|DATAC0|... InputModemSpeechFile "
        "BinaryDataFile\n"
        "  -v or --vv              verbose options\n"
        "  --testframes            count raw and coded errors in testframes "
        "sent by tx\n"
        "  --framesperburst  N     N frames per burst (default 1, must match "
        "Tx)\n"
        "  --scatter         file  write scatter diagram symbols to file "
        "(Octave text file format)\n"
        "  --singleline            single line summary at end of test, used "
        "for logging\n"
        "  --quiet\n"
        "\n"
        "For FSK_LDPC only:\n\n"
        "  -m          2|4       number of FSK tones\n"
        "  --Fs        FreqHz    sample rate (default 8000)\n"
        "  --Rs        FreqHz    symbol rate (default 100)\n"
        "  --mask      shiftHz   Use \"mask\" freq estimator (default is "
        "\"peak\" estimator)\n\n"
        "  --shift     FreqHz    shift between tones (default 200)\n"
        " --fsk_lower  freq      lower limit of freq estimator (default 0)\n"
        " --fsk_upper  freq      upper limit of freq estimator (default Fs/2)\n"
        "  --code      CodeName  LDPC code (defaults (512,256)\n"
        "  --listcodes           list available LDPC codes\n"
        "\n",
        argv[0]);

    fprintf(stderr,
            "example: %s --framesperburst 1 --testframes datac0 samples.s16 "
            "/dev/null\n\n",
            argv[0]);
    exit(1);
  }

  if ((argc - dx) < 3) {
    fprintf(stderr, "too few arguments.\n");
    goto helpmsg;
  }

  mode = -1;
  if (!strcmp(argv[dx], "FSK_LDPC") || !strcmp(argv[dx], "fsk_ldpc"))
    mode = FREEDV_MODE_FSK_LDPC;
  if (!strcmp(argv[dx], "DATAC0") || !strcmp(argv[dx], "datac0"))
    mode = FREEDV_MODE_DATAC0;
  if (!strcmp(argv[dx], "DATAC1") || !strcmp(argv[dx], "datac1"))
    mode = FREEDV_MODE_DATAC1;
  if (!strcmp(argv[dx], "DATAC3") || !strcmp(argv[dx], "datac3"))
    mode = FREEDV_MODE_DATAC3;
  if (!strcmp(argv[dx], "DATAC4") || !strcmp(argv[dx], "datac4"))
    mode = FREEDV_MODE_DATAC4;
  if (!strcmp(argv[dx], "DATAC13") || !strcmp(argv[dx], "datac13"))
    mode = FREEDV_MODE_DATAC13;
  if (mode == -1) {
    fprintf(stderr, "Error in mode: %s\n", argv[dx]);
    exit(1);
  }

  if (strcmp(argv[dx + 1], "-") == 0)
    fin = stdin;
  else if ((fin = fopen(argv[dx + 1], "rb")) == NULL) {
    fprintf(stderr, "Error opening input raw modem sample file: %s: %s.\n",
            argv[2], strerror(errno));
    exit(1);
  }

  if (strcmp(argv[dx + 2], "-") == 0)
    fout = stdout;
  else if ((fout = fopen(argv[dx + 2], "wb")) == NULL) {
    fprintf(stderr, "Error opening output speech sample file: %s: %s.\n",
            argv[3], strerror(errno));
    exit(1);
  }

  if (mode == FREEDV_MODE_FSK_LDPC) {
    freedv = freedv_open_advanced(mode, &adv);
    struct FSK *fsk = freedv_get_fsk(freedv);
    fsk_set_freq_est_alg(fsk, mask);

    /* optionally set freq estimator limits */
    if (!user_fsk_lower) fsk_lower = 0;
    if (!user_fsk_upper) fsk_upper = adv.Fs / 2;
    fprintf(stderr, "Setting estimator limits to %d to %d Hz.\n", fsk_lower,
            fsk_upper);
    fsk_set_freq_est_limits(fsk, fsk_lower, fsk_upper);
  } else {
    freedv = freedv_open(mode);
  }

  assert(freedv != NULL);
  freedv_set_verbose(freedv, verbose);
  freedv_set_test_frames(freedv, use_testframes);
  freedv_set_frames_per_burst(freedv, framesperburst);

  if (mode == FREEDV_MODE_FSK_LDPC) {
    struct FSK *fsk = freedv_get_fsk(freedv);
    if (!quiet)
      fprintf(stderr, "Nbits: %d N: %d Ndft: %d\n", fsk->Nbits, fsk->N,
              fsk->Ndft);
  }

  /* for streaming bytes it's much easier use the modes that have a multiple of
   * 8 payload bits/frame */
  assert((freedv_get_bits_per_modem_frame(freedv) % 8) == 0);
  int bytes_per_modem_frame = freedv_get_bits_per_modem_frame(freedv) / 8;
  // last two bytes used for CRC
  if (!quiet)
    fprintf(stderr, "payload bytes_per_modem_frame: %d\n",
            bytes_per_modem_frame - 2);
  uint8_t bytes_out[bytes_per_modem_frame];
  short demod_in[freedv_get_n_max_modem_samples(freedv)];

  signal(SIGINT, INThandler);
  signal(SIGTERM, INThandler);

  /* We need to work out how many samples the demod needs on each
     call (nin).  This is used to adjust for differences in the tx
     and rx sample clock frequencies */

  nin = freedv_nin(freedv);
  while ((fread(demod_in, sizeof(short), nin, fin) == nin) && !finish) {
    buf++;

    nbytes = freedv_rawdatarx(freedv, bytes_out, demod_in);
    nin = freedv_nin(freedv);

    if (nbytes) {
      // dont output CRC
      fwrite(bytes_out, sizeof(uint8_t), nbytes - 2, fout);

      // log some stats
      nbytes_out += nbytes - 2;
      nframes_out++;
      struct MODEM_STATS stats;
      freedv_get_modem_extended_stats(freedv, &stats);
      snr_sum += stats.snr_est;
      if (foct) {
        char name[64];
        sprintf(name, "rx_symbols_%d", nframes_out);
        octave_save_complex(foct, name, (COMP *)stats.rx_symbols, stats.nr,
                            stats.Nc, MODEM_STATS_NC_MAX + 1);
      }
    }

    /* if using pipes we probably don't want the usual buffering */
    if (fout == stdout) fflush(stdout);
  }

  fclose(fin);
  fclose(fout);
  fprintf(stderr, "modembufs: %6d bytes: %5d Frms.: %5d SNRAv: %5.2f\n", buf,
          nbytes_out, nframes_out, snr_sum / nframes_out);
  int ret = 0;

  /* in testframe mode finish up with some stats */

  if (freedv_get_test_frames(freedv)) {
    int Tbits = freedv_get_total_bits(freedv);
    int Terrs = freedv_get_total_bit_errors(freedv);
    float uncoded_ber = (float)Terrs / Tbits;
    fprintf(stderr, "BER......: %5.4f Tbits: %5d Terrs: %5d\n",
            (double)uncoded_ber, Tbits, Terrs);
    int Tbits_coded = freedv_get_total_bits_coded(freedv);
    int Terrs_coded = freedv_get_total_bit_errors_coded(freedv);
    float coded_ber = (float)Terrs_coded / Tbits_coded;
    fprintf(stderr, "Coded BER: %5.4f Tbits: %5d Terrs: %5d\n",
            (double)coded_ber, Tbits_coded, Terrs_coded);
    int Tpackets = freedv_get_total_packets(freedv);
    int Tpacket_errors = freedv_get_total_packet_errors(freedv);
    fprintf(stderr, "Coded FER: %5.4f Tfrms: %5d Tfers: %5d\n",
            (float)Tpacket_errors / Tpackets, Tpackets, Tpacket_errors);

    if (single_line_summary) {
      struct MODEM_STATS stats;
      freedv_get_modem_extended_stats(freedv, &stats);
      fprintf(stderr, "FrmGd FrmDt Bytes SNRAv RawBER    Pre  Post UWfails\n");
      fprintf(stderr, "%5d %5d %5d %5.2f %5.4f  %5d %5d   %5d\n", nframes_out,
              Tpackets, nbytes_out, snr_sum / nframes_out, uncoded_ber,
              stats.pre, stats.post, stats.uw_fails);
    }

    /* set return code for Ctest */
    if ((uncoded_ber < 0.1f) && (coded_ber < 0.01f))
      ret = 0;
    else
      ret = 1;
  }

  freedv_close(freedv);
  if (foct) fclose(foct);
  return ret;
}
