/***************************************************************************
 *
 * Project:  OpenCPN
 *
 ***************************************************************************
 *   Copyright (C) 2013 by David S. Register                               *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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 General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,  USA.         *
 **************************************************************************/

#include "TCDS_Binary_Harmonic.h"
#include "tcmgr.h"
#include <string>
/* Declarations for zoneinfo compatibility */

/* Most of these entries are loaded from the tzdata.h include file. That
 *   file was generated from tzdata200c.                                  */

static const char *tz_names[][2] = {
#include "tzdata.h"

    /* Terminator */
    {NULL, NULL}};

/*  Timelib  Time services.
 *    Original XTide source code date: 1997-08-15
 *    Last modified 1998-09-07 by Mike Hopper for WXTide32
 *
 *    Copyright (C) 1997  David Flater.
 *    Also starring:  Geoff Kuenning; Rob Miracle; Dean Pentcheff;
 *    Eric Rosen.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    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 General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *    Changes by Mike Hopper for WXTide32:
 *    Changed do_timestamp to shorten NT's LONG time zone names just the CAPS
 *    Changed _hpux selector to WIN32 to select HP timezone values.
 *    Added a whole set of remote TZ handler routines, all starting with "tz".
 */

#ifndef __WXMSW__
typedef unsigned short WORD;
typedef long LONG;
typedef char WCHAR;

typedef struct _SYSTEMTIME {
  WORD wYear;
  WORD wMonth;
  WORD wDayOfWeek;
  WORD wDay;
  WORD wHour;
  WORD wMinute;
  WORD wSecond;
  WORD wMilliseconds;
} SYSTEMTIME, *PSYSTEMTIME;

typedef struct _TIME_ZONE_INFORMATION {
  LONG Bias;
  WCHAR StandardName[32];
  SYSTEMTIME StandardDate;
  LONG StandardBias;
  WCHAR DaylightName[32];
  SYSTEMTIME DaylightDate;
  LONG DaylightBias;
} TIME_ZONE_INFORMATION, *PTIME_ZONE_INFORMATION;
#else
#include <windows.h>
#endif

/*-----------------9/24/2002 4:30PM-----------------
 * An attempt to get Windoz to work with non-US timezones...
 * --------------------------------------------------*/
typedef struct {
  TIME_ZONE_INFORMATION tzi;
  time_t year_beg;
  time_t year_end;
  time_t enter_std;
  time_t enter_dst;
  int isdst;
} tz_info_entry;

tz_info_entry tz_info_local, tz_info_remote, *tz_info = &tz_info_local;

/*-----------------9/24/2002 8:12AM-----------------
 * Parse time string in the form [-][hh][:mm][:ss] into seconds.
 * Returns updated string pointer and signed seconds.
 * --------------------------------------------------*/
char *tz_time2sec(char *psrc, long *timesec) {
  int neg;
  long temp, mpy;
  *timesec = 0;
  mpy = 3600;
  while (*psrc == ' ') psrc++; /* Skip leading blanks */
  if (*psrc == '+') psrc++;    /* Gobble leading + */
  if (*psrc == '-') {
    neg = TRUE;
    psrc++;
  } else
    neg = FALSE;

  do {
    temp = 0;
    while (isdigit(*psrc)) temp = temp * 10 + (*(psrc++) - '0');

    *timesec = *timesec + temp * mpy;

    if (*psrc == ':') {
      mpy /= 60;
      psrc++;
    }
  } while (isdigit(*psrc));

  if (neg) *timesec = 0 - *timesec;

  return (psrc);
}

/*-----------------9/24/2002 8:16AM-----------------
 * Parse timezone name string.
 * Returns string at psrc, updated psrc, and chars copied.
 * --------------------------------------------------*/
static char *tz_parse_name(char *psrc, char *pdst, int maxlen) {
  int nReturn;

  nReturn = 0;
  while (*psrc == ' ') psrc++; /* Skip leading blanks */

  while (isalpha(*psrc) && nReturn < maxlen) {
    *(pdst++) = *(psrc++);
    nReturn++;
  }

  *pdst = 0;
  return (psrc);
}

/*-----------------9/24/2002 8:38AM-----------------
 * Parse tz rule string into SYSTEMTIME structure.
 * --------------------------------------------------*/
static char *tz_parse_rule(char *psrc, SYSTEMTIME *st) {
  int mol[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  long temp, mo;
  if (*psrc == ',') psrc++; /* Gobble leading comma */

  while (*psrc == ' ') psrc++; /* Skip leading blanks */

  st->wYear = 0;
  st->wMonth = 0;
  st->wDay = 0;
  st->wDayOfWeek = 0;
  st->wHour = 0;
  st->wMinute = 0;
  st->wSecond = 0;
  st->wMilliseconds = 0;

  if (*psrc == 'J') { /* Julian day (1 <= n <= 365) no leap */
    psrc++;           /* Gobble 'J' */
    temp = 0;
    while (isdigit(*psrc)) temp = temp * 10 + (*(psrc++) - '0');

    if (temp < 1 || temp > 365) return (0);
    temp--;
    for (mo = 0; temp >= mol[mo]; mo++) temp -= mol[mo];
    st->wMonth = mo + 1;
    st->wDay = temp + 1;
    st->wYear = 1;
  }

  else if (*psrc == 'M') {
    psrc++; /* Gobble 'M' */

    temp = 0;
    while (isdigit(*psrc)) temp = temp * 10 + (*(psrc++) - '0'); /* Get month */
    if (temp < 1 || temp > 12 || *psrc != '.') return (0);
    st->wMonth = (unsigned short)temp;

    psrc++; /* Gobble '.' */
    temp = 0;
    while (isdigit(*psrc))
      temp = temp * 10 + (*(psrc++) - '0'); /* Get week number */
    if (temp < 1 || temp > 5 || *psrc != '.') return (0);
    st->wDay = (unsigned short)temp;

    psrc++; /* Gobble '.' */
    temp = 0;
    while (isdigit(*psrc))
      temp = temp * 10 + (*(psrc++) - '0'); /* Get day of week number */
    if (temp < 0 || temp > 6) return (0);
    st->wDayOfWeek = (unsigned short)temp;
  }

  if (*psrc == '/') { /* time is specified */
    psrc++;           /* Gobble '/' */
    psrc = tz_time2sec(psrc, &temp);
    if (temp < 0 || temp >= 86400) return (0);
    st->wHour = temp / 3600;
    temp = temp % 3600;
    st->wMinute = temp / 60;
    st->wSecond = temp % 60;
  }
  return (psrc);
}

/*-----------------9/24/2002 3:38PM-----------------
 * Load tz rule into timezone info data block.
 * --------------------------------------------------*/
static void tz_load_rule(char *prule, tz_info_entry *tz_info_remote) {
  prule = tz_parse_name(prule, (char *)tz_info_remote->tzi.StandardName, 30);
  prule = tz_time2sec(prule, &tz_info_remote->tzi.Bias);
  tz_info_remote->tzi.Bias /= 60;
  tz_info_remote->tzi.StandardBias = 0;

  prule = tz_parse_name(prule, (char *)tz_info_remote->tzi.DaylightName, 30);
  if (*(char *)tz_info_remote->tzi.DaylightName != '\0') {
    prule = tz_time2sec(prule, &tz_info_remote->tzi.DaylightBias);
    tz_info_remote->tzi.DaylightBias /= 60;
    if (tz_info_remote->tzi.DaylightBias == 0)
      tz_info_remote->tzi.DaylightBias = -60;
    else
      tz_info_remote->tzi.DaylightBias -= tz_info_remote->tzi.Bias;

    if (*prule == ',') {
      prule = tz_parse_rule(prule, &tz_info_remote->tzi.DaylightDate);
      if (prule && *prule == ',')
        tz_parse_rule(prule, &tz_info_remote->tzi.StandardDate);
      else
        tz_parse_rule((char *)"M10.5.0/02:00:00",
                      &tz_info_remote->tzi.StandardDate);
    } else { /* Default is US style tz change */
      tz_parse_rule((char *)"M4.1.0/02:00:00",
                    &tz_info_remote->tzi.DaylightDate);
      tz_parse_rule((char *)"M10.5.0/02:00:00",
                    &tz_info_remote->tzi.StandardDate);
    }
  } else { /* No DST */
    tz_info_remote->tzi.DaylightDate.wMonth = 0;
    tz_info_remote->isdst = 0;
  }
}

/* Attempt to load up the local time zone of the location.  Moof! */
static void change_time_zone(const char *tz) {
  //  static char env_string[MAXARGLEN+1];
  int index;

  if (*tz == ':') tz++; /* Gobble lead-in char */
  /* Find the translation for the timezone string */
  index = 0;
  while (1) {
    if (tz_names[index][0] == NULL) {
      tz_info = &tz_info_local;
      /* Not found. */
      break;
    }
    if (!strcmp(tz_names[index][0], (tz))) {
      char tz[40];
      strncpy(tz, tz_names[index][1], 39);
      tz_load_rule(tz, &tz_info_remote);
      tz_info = &tz_info_remote;
      /* Force compute next time this data is used */
      tz_info->year_beg = 0;  // Begin date/time is Jan 1, 1970
      tz_info->year_end = 0;  // End date/time is Jan 1, 1970
      //      sprintf (env_string, "TZ=%s", tz_names[index][1]);
      break;
    }
    index++;
  }
}

TCDS_Binary_Harmonic::TCDS_Binary_Harmonic() {
  m_cst_speeds = NULL;
  m_cst_nodes = NULL;
  m_cst_epochs = NULL;

  num_IDX = 0;
  num_nodes = 0;
  num_csts = 0;
  num_epochs = 0;

  //  Build the units array
}

TCDS_Binary_Harmonic::~TCDS_Binary_Harmonic() {}

TC_Error_Code TCDS_Binary_Harmonic::LoadData(const wxString &data_file_path) {
  if (!open_tide_db(data_file_path.mb_str())) return TC_TCD_FILE_CORRUPT;

  // Build the tables of constituent data

  DB_HEADER_PUBLIC hdr = get_tide_db_header();

  source_ident = wxString(hdr.version, wxConvUTF8);

  num_csts = hdr.constituents;
  if (0 == num_csts) return TC_GENERIC_ERROR;

  num_nodes = hdr.number_of_years;
  if (0 == num_nodes) return TC_GENERIC_ERROR;

  //  Allocate a working buffer
  m_work_buffer = (double *)malloc(num_csts * sizeof(double));

  //  Constituent speeds
  m_cst_speeds = (double *)malloc(num_csts * sizeof(double));

  for (int a = 0; a < num_csts; a++) {
    m_cst_speeds[a] = get_speed(a);
    m_cst_speeds[a] *= M_PI / 648000; /* Convert to radians per second */
  }

  //  Equilibrium tables by year
  m_first_year = hdr.start_year;
  num_epochs = hdr.number_of_years;

  m_cst_epochs = (double **)malloc(num_csts * sizeof(double *));
  for (int i = 0; i < num_csts; i++)
    m_cst_epochs[i] = (double *)malloc(num_epochs * sizeof(double));

  for (int i = 0; i < num_csts; i++) {
    for (int year = 0; year < num_epochs; year++) {
      m_cst_epochs[i][year] = get_equilibrium(i, year);
      m_cst_epochs[i][year] *= M_PI / 180.0;
    }
  }

  //  Node factors

  m_cst_nodes = (double **)malloc(num_csts * sizeof(double *));
  for (int a = 0; a < num_csts; a++)
    m_cst_nodes[a] = (double *)malloc(num_nodes * sizeof(double));

  for (int a = 0; a < num_csts; a++) {
    for (int year = 0; year < num_nodes; year++)
      m_cst_nodes[a][year] = get_node_factor(a, year);
  }

  // now load and create the index

  TIDE_RECORD *ptiderec = (TIDE_RECORD *)calloc(sizeof(TIDE_RECORD), 1);
  for (unsigned int i = 0; i < hdr.number_of_records; i++) {
    read_tide_record(i, ptiderec);

    num_IDX++;  // Keep counting entries for harmonic file stuff
    IDX_entry *pIDX = new IDX_entry;
    pIDX->source_data_type = SOURCE_TYPE_BINARY_HARMONIC;
    pIDX->pDataSource = NULL;

    pIDX->Valid15 = 0;

    pIDX->pref_sta_data = NULL;  // no reference data yet
    pIDX->IDX_Useable = 1;       // but assume data is OK
    pIDX->IDX_tzname = NULL;

    pIDX->IDX_lon = ptiderec->header.longitude;
    pIDX->IDX_lat = ptiderec->header.latitude;

    const char *tz = get_tzfile(ptiderec->header.tzfile);
    change_time_zone((char *)tz);
    if (tz_info) pIDX->IDX_time_zone = -tz_info->tzi.Bias;

    strncpy(pIDX->IDX_station_name, ptiderec->header.name, MAXNAMELEN);

    // Extract a "depth" value from name string, if present.
    //  Name string will contain  "(depth xx ft)"
    std::string name(ptiderec->header.name);
    size_t n = name.find("depth");
    if (n != std::string::npos) {
      std::string d = name.substr(n);
      std::string dp = d.substr(6);
      size_t nd = dp.find_first_of(' ');
      std::string sval = dp.substr(0, nd);
      int depth = std::stoi(sval);
      pIDX->current_depth = depth;
    }

    pIDX->IDX_flood_dir = ptiderec->max_direction;
    pIDX->IDX_ebb_dir = ptiderec->min_direction;

    if (REFERENCE_STATION == ptiderec->header.record_type) {
      //    Establish Station Type
      wxString caplin(pIDX->IDX_station_name, wxConvUTF8);
      caplin.MakeUpper();
      if (caplin.Contains(_T("CURRENT")))
        pIDX->IDX_type = 'C';
      else
        pIDX->IDX_type = 'T';

      int t1 = ptiderec->zone_offset;
      double zone_offset = (double)(t1 / 100) + ((double)(t1 % 100)) / 60.;
      //            pIDX->IDX_time_zone = t1a;

      pIDX->IDX_ht_time_off = pIDX->IDX_lt_time_off = 0;
      pIDX->IDX_ht_mpy = pIDX->IDX_lt_mpy = 1.0;
      pIDX->IDX_ht_off = pIDX->IDX_lt_off = 0.0;
      pIDX->IDX_ref_dbIndex = ptiderec->header.reference_station;  // will be -1

      //  build a Station_Data class, and add to member array

      Station_Data *psd = new Station_Data;

      psd->amplitude = (double *)malloc(num_csts * sizeof(double));
      psd->epoch = (double *)malloc(num_csts * sizeof(double));
      psd->station_name = (char *)malloc(ONELINER_LENGTH);

      strncpy(psd->station_name, ptiderec->header.name, MAXNAMELEN);
      psd->station_type = pIDX->IDX_type;

      // Get meridian, which is seconds difference from UTC, not figuring DST,
      // so that New York is always (-300 * 60)
      psd->meridian = -(tz_info->tzi.Bias * 60);
      psd->zone_offset = zone_offset;

      // Get units
      strncpy(psd->unit, get_level_units(ptiderec->level_units), 40 - 1);
      psd->unit[40 - 1] = '\0';

      psd->have_BOGUS = (findunit(psd->unit) != -1) &&
                        (known_units[findunit(psd->unit)].type == BOGUS);

      int unit_c;
      if (psd->have_BOGUS)
        unit_c = findunit("knots");
      else
        unit_c = findunit(psd->unit);

      if (unit_c != -1) {
        strncpy(psd->units_conv, known_units[unit_c].name,
                sizeof(psd->units_conv) - 1);
        strncpy(psd->units_abbrv, known_units[unit_c].abbrv,
                sizeof(psd->units_abbrv) - 1);
      } else {
        strncpy(psd->units_conv, psd->unit, 40 - 1);
        psd->units_conv[40 - 1] = '\0';
        strncpy(psd->units_abbrv, psd->unit, 20 - 1);
        psd->units_abbrv[20 - 1] = '\0';
      }

      // Get constituents
      for (int a = 0; a < num_csts; a++) {
        psd->amplitude[a] = ptiderec->amplitude[a];
        psd->epoch[a] = ptiderec->epoch[a] * M_PI / 180.;
      }

      psd->DATUM = ptiderec->datum_offset;

      m_msd_array.Add(psd);  // add it to the member array
      pIDX->pref_sta_data = psd;
      pIDX->IDX_ref_dbIndex = i;
      pIDX->have_offsets = 0;
    } else if (SUBORDINATE_STATION == ptiderec->header.record_type) {
      //    Establish Station Type
      wxString caplin(pIDX->IDX_station_name, wxConvUTF8);
      caplin.MakeUpper();
      if (caplin.Contains(_T("CURRENT")))
        pIDX->IDX_type = 'c';
      else
        pIDX->IDX_type = 't';

      int t1 = ptiderec->max_time_add;
      double t1a = (double)(t1 / 100) + ((double)(t1 % 100)) / 60.;
      t1a *= 60;  // Minutes
      pIDX->IDX_ht_time_off = t1a;
      pIDX->IDX_ht_mpy = ptiderec->max_level_multiply;
      if (0. == pIDX->IDX_ht_mpy) pIDX->IDX_ht_mpy = 1.0;
      pIDX->IDX_ht_off = ptiderec->max_level_add;

      t1 = ptiderec->min_time_add;
      t1a = (double)(t1 / 100) + ((double)(t1 % 100)) / 60.;
      t1a *= 60;  // Minutes
      pIDX->IDX_lt_time_off = t1a;
      pIDX->IDX_lt_mpy = ptiderec->min_level_multiply;
      if (0. == pIDX->IDX_lt_mpy) pIDX->IDX_lt_mpy = 1.0;
      pIDX->IDX_lt_off = ptiderec->min_level_add;

      pIDX->IDX_ref_dbIndex = ptiderec->header.reference_station;
      //           strncpy(pIDX->IDX_reference_name, ptiderec->header.name,
      //           MAXNAMELEN);

      if (pIDX->IDX_ht_time_off || pIDX->IDX_ht_off != 0.0 ||
          pIDX->IDX_lt_off != 0.0 || pIDX->IDX_ht_mpy != 1.0 ||
          pIDX->IDX_lt_mpy != 1.0)
        pIDX->have_offsets = 1;
    }

    m_IDX_array.Add(pIDX);
  }

  //  Mark the index entries individually with invariant harmonic constants
  unsigned int max_index = GetMaxIndex();
  for (unsigned int i = 0; i < max_index; i++) {
    IDX_entry *pIDX = GetIndexEntry(i);
    if (pIDX) {
      pIDX->num_nodes = num_nodes;
      pIDX->num_csts = num_csts;
      pIDX->num_epochs = num_epochs;
      pIDX->m_cst_speeds = m_cst_speeds;
      pIDX->m_cst_nodes = m_cst_nodes;
      pIDX->m_cst_epochs = m_cst_epochs;
      pIDX->first_year = m_first_year;
      pIDX->m_work_buffer = m_work_buffer;
    }
  }
  free(ptiderec);

  return TC_NO_ERROR;
}

IDX_entry *TCDS_Binary_Harmonic::GetIndexEntry(int n_index) {
  return &m_IDX_array[n_index];
}

TC_Error_Code TCDS_Binary_Harmonic::LoadHarmonicData(IDX_entry *pIDX) {
  // Find the indicated Master station
  if (!strlen(pIDX->IDX_reference_name)) {
    strncpy(pIDX->IDX_reference_name, get_station(pIDX->IDX_ref_dbIndex),
            MAXNAMELEN - 1);
    pIDX->IDX_reference_name[MAXNAMELEN - 1] = '\0';

    //        TIDE_RECORD *ptiderec = (TIDE_RECORD *)calloc(sizeof(TIDE_RECORD),
    //        1); read_tide_record (pIDX->IDX_ref_dbIndex, ptiderec); free(
    //        ptiderec );

    IDX_entry *pIDX_Ref = &m_IDX_array.Item(pIDX->IDX_ref_dbIndex);
    Station_Data *pRefSta = pIDX_Ref->pref_sta_data;
    pIDX->pref_sta_data = pRefSta;
    pIDX->station_tz_offset =
        -pRefSta->meridian + (pRefSta->zone_offset * 3600);
  }
  return TC_NO_ERROR;
}
