/* Comma-separated values.
 *
 * Author: Steffen Vogel <post@steffenvogel.de>
 * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
 * SPDX-License-Identifier: Apache-2.0
 */

#include <cinttypes>
#include <cstring>

#include <villas/exceptions.hpp>
#include <villas/formats/column.hpp>
#include <villas/sample.hpp>
#include <villas/signal.hpp>
#include <villas/timing.hpp>

using namespace villas;
using namespace villas::node;

size_t ColumnLineFormat::sprintLine(char *buf, size_t len,
                                    const struct Sample *smp) {
  size_t off = 0;

  if (flags & (int)SampleFlags::HAS_TS_ORIGIN) {
    if (smp->flags & (int)SampleFlags::HAS_TS_ORIGIN)
      off += snprintf(buf + off, len - off, "%lld%c%09lld",
                      (long long)smp->ts.origin.tv_sec, separator,
                      (long long)smp->ts.origin.tv_nsec);
    else
      off += snprintf(buf + off, len - off, "nan%cnan", separator);
  }

  if (flags & (int)SampleFlags::HAS_OFFSET) {
    if (smp->flags & (int)SampleFlags::HAS_TS_RECEIVED) {
      auto offset = time_delta(&smp->ts.origin, &smp->ts.received);
      off += snprintf(buf + off, len - off, "%c%.09f", separator, offset);
    } else
      off += snprintf(buf + off, len - off, "%cnan", separator);
  }

  if (flags & (int)SampleFlags::HAS_SEQUENCE) {
    if (smp->flags & (int)SampleFlags::HAS_SEQUENCE)
      off += snprintf(buf + off, len - off, "%c%" PRIu64, separator,
                      smp->sequence);
    else
      off += snprintf(buf + off, len - off, "%cnan", separator);
  }

  if (flags & (int)SampleFlags::HAS_DATA) {
    if (smp->flags & (int)SampleFlags::HAS_DATA) {
      for (unsigned i = 0; i < smp->length; i++) {
        auto sig = smp->signals->getByIndex(i);
        if (!sig)
          break;

        off += snprintf(buf + off, len - off, "%c", separator);
        off += smp->data[i].printString(sig->type, buf + off, len - off,
                                        real_precision);
      }
    }
  }

  off += snprintf(buf + off, len - off, "%c", delimiter);

  return off;
}

size_t ColumnLineFormat::sscanLine(const char *buf, size_t len,
                                   struct Sample *smp) {
  int ret;
  unsigned i = 0;
  const char *ptr = buf;
  char *end;

  struct timespec offset;

  smp->flags = 0;
  smp->signals = signals;

  smp->ts.origin.tv_sec = strtoul(ptr, &end, 10);
  if (end == ptr || *end == delimiter)
    goto out;

  ptr = end + 1;

  smp->ts.origin.tv_nsec = strtoul(ptr, &end, 10);
  if (end == ptr || *end == delimiter)
    goto out;

  ptr = end + 1;

  smp->flags |= (int)SampleFlags::HAS_TS_ORIGIN;

  offset = time_from_double(strtof(ptr, &end));
  if (end == ptr || *end == delimiter)
    goto out;

  smp->ts.received = time_add(&smp->ts.origin, &offset);

  smp->flags |= (int)SampleFlags::HAS_TS_RECEIVED;

  ptr = end + 1;

  smp->sequence = strtoul(ptr, &end, 10);
  if (end == ptr || *end == delimiter)
    goto out;

  smp->flags |= (int)SampleFlags::HAS_SEQUENCE;

  for (ptr = end + 1, i = 0; i < smp->capacity; ptr = end + 1, i++) {
    if (*end == delimiter)
      goto out;

    auto sig = smp->signals->getByIndex(i);
    if (!sig)
      goto out;

    ret = smp->data[i].parseString(sig->type, ptr, &end);
    if (ret || end == ptr) // There are no valid values anymore.
      goto out;
  }

out:
  if (*end == delimiter)
    end++;

  smp->length = i;
  if (smp->length > 0)
    smp->flags |= (int)SampleFlags::HAS_DATA;

  return end - buf;
}

void ColumnLineFormat::header(FILE *f, const SignalList::Ptr sigs) {
  // Abort if we are not supposed to, or have already printed the header
  if (!print_header || header_printed)
    return;

  if (comment)
    fprintf(f, "%c ", comment);

  if (flags & (int)SampleFlags::HAS_TS_ORIGIN)
    fprintf(f, "secs%cnsecs%c", separator, separator);

  if (flags & (int)SampleFlags::HAS_OFFSET)
    fprintf(f, "offset%c", separator);

  if (flags & (int)SampleFlags::HAS_SEQUENCE)
    fprintf(f, "sequence%c", separator);

  if (flags & (int)SampleFlags::HAS_DATA) {
    for (unsigned i = 0; i < sigs->size(); i++) {
      auto sig = sigs->getByIndex(i);
      if (!sig)
        break;

      if (!sig->name.empty())
        fprintf(f, "%s", sig->name.c_str());
      else
        fprintf(f, "signal%u", i);

      if (!sig->unit.empty())
        fprintf(f, "[%s]", sig->unit.c_str());

      if (i + 1 < sigs->size())
        fprintf(f, "%c", separator);
    }
  }

  fprintf(f, "%c", delimiter);

  LineFormat::header(f, sigs);
}

void ColumnLineFormat::parse(json_t *json) {
  int ret;
  json_error_t err;
  const char *sep = nullptr;

  ret = json_unpack_ex(json, &err, 0, "{ s?: s }", "separator", &sep);
  if (ret)
    throw ConfigError(json, err, "node-config-format-column",
                      "Failed to parse format configuration");

  if (sep) {
    if (strlen(sep) != 1)
      throw ConfigError(json, "node-config-format-column-separator",
                        "Column separator must be a single character!");

    separator = sep[0];
  }

  LineFormat::parse(json);
}

// Register formats
static char n1[] = "csv";
static char d1[] = "Comma-separated values";
static ColumnLineFormatPlugin<
    n1, d1,
    (int)SampleFlags::HAS_TS_ORIGIN | (int)SampleFlags::HAS_SEQUENCE |
        (int)SampleFlags::HAS_OFFSET | (int)SampleFlags::HAS_DATA,
    '\n', ','>
    p1;

static char n2[] = "tsv";
static char d2[] = "Tabulator-separated values";
static ColumnLineFormatPlugin<
    n2, d2,
    (int)SampleFlags::HAS_TS_ORIGIN | (int)SampleFlags::HAS_SEQUENCE |
        (int)SampleFlags::HAS_OFFSET | (int)SampleFlags::HAS_DATA,
    '\n', '\t'>
    p2;