/*
 * Vzic - a program to convert Olson timezone database files into VZTIMEZONE
 * files compatible with the iCalendar specification (RFC2445).
 *
 * Copyright (C) 2000-2001 Ximian, Inc.
 * Copyright (C) 2003 Damon Chaplin.
 *
 * Author: Damon Chaplin <damon@gnome.org>
 *
 * 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.
 */

/*
 * These functions are for dumping all the parsed Zones and Rules to
 * files, to be compared with the output of vzic-dump.pl to check our parsing
 * code is OK. Some of the functions are also used for producing debugging
 * output.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "vzic.h"
#include "vzic-dump.h"


static void	dump_add_rule			(char		*name,
						 GArray		*rule_array,
						 GPtrArray	*name_array);
static int	dump_compare_strings		(const void	*arg1,
						 const void	*arg2);


void
dump_zone_data			(GArray		*zone_data,
				 char		*filename)
{
  static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
			    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  FILE *fp;
  ZoneData *zone;
  ZoneLineData *zone_line;
  int i, j;
  gboolean output_month, output_day, output_time;

  fp = fopen (filename, "w");
  if (!fp) {
    fprintf (stderr, "Couldn't create file: %s\n", filename);
    exit (1);
  }

  for (i = 0; i < zone_data->len; i++) {
    zone = &g_array_index (zone_data, ZoneData, i);

    fprintf (fp, "Zone\t%s\t", zone->zone_name);

    for (j = 0; j < zone->zone_line_data->len; j++) {
      zone_line = &g_array_index (zone->zone_line_data, ZoneLineData, j);

      if (j != 0)
	fprintf (fp, "\t\t\t");

      fprintf (fp, "%s\t", dump_time (zone_line->stdoff_seconds, TIME_WALL,
				      FALSE));

      if (zone_line->rules)
	fprintf (fp, "%s\t", zone_line->rules);
      else if (zone_line->save_seconds != 0)
	fprintf (fp, "%s\t", dump_time (zone_line->save_seconds, TIME_WALL,
					FALSE));
      else
	fprintf (fp, "-\t");

      fprintf (fp, "%s\t", zone_line->format ? zone_line->format : "-");

      if (zone_line->until_set) {
	fprintf (fp, "%s\t", dump_year (zone_line->until_year));

	output_month = output_day = output_time = FALSE;

	if (zone_line->until_time_code != TIME_WALL
	    || zone_line->until_time_seconds != 0)
	  output_month = output_day = output_time = TRUE;
	else if (zone_line->until_day_code != DAY_SIMPLE
		 || zone_line->until_day_number != 1)
	  output_month = output_day = TRUE;
	else if (zone_line->until_month != 0)
	  output_month = TRUE;

	if (output_month)
	  fprintf (fp, "%s", months[zone_line->until_month]);

	fprintf (fp, "\t");

	if (output_day)
	  fprintf (fp, "%s", dump_day_coded (zone_line->until_day_code,
					     zone_line->until_day_number,
					     zone_line->until_day_weekday));

	fprintf (fp, "\t");

	if (output_time)
	  fprintf (fp, "%s", dump_time (zone_line->until_time_seconds,
					zone_line->until_time_code, FALSE));

      } else {
	fprintf (fp, "\t\t\t");
      }

      fprintf (fp, "\n");
    }
  }

  fclose (fp);
}


void
dump_rule_data			(GHashTable	*rule_data,
				 char		*filename)
{
  FILE *fp;
  GPtrArray *name_array;
  GArray *rule_array;
  int i;
  char *name;

  fp = fopen (filename, "w");
  if (!fp) {
    fprintf (stderr, "Couldn't create file: %s\n", filename);
    exit (1);
  }

  /* We need to sort the rules by their names, so they are in the same order
     as the Perl output. So we place all the names in a temporary GPtrArray,
     sort it, then output them. */
  name_array = g_ptr_array_new ();
  g_hash_table_foreach (rule_data, (GHFunc) dump_add_rule, name_array);
  qsort (name_array->pdata, name_array->len, sizeof (char*),
	 dump_compare_strings);

  for (i = 0; i < name_array->len; i++) {
    name = g_ptr_array_index (name_array, i);
    rule_array = g_hash_table_lookup (rule_data, name);
    if (!rule_array) {
      fprintf (stderr, "Couldn't access rules: %s\n", name);
      exit (1);
    }
    dump_rule_array (name, rule_array, fp);
  }

  g_ptr_array_free (name_array, TRUE);

  fclose (fp);
}


static void
dump_add_rule			(char		*name,
				 GArray		*rule_array,
				 GPtrArray	*name_array)
{
  g_ptr_array_add (name_array, name);
}


static int
dump_compare_strings		(const void	*arg1,
				 const void	*arg2)
{
  char **a, **b;

  a = (char**) arg1;
  b = (char**) arg2;

  return strcmp (*a, *b);
}


void
dump_rule_array			(char		*name,
				 GArray		*rule_array,
				 FILE		*fp)
{
  static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
			    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };

  RuleData *rule;
  int i;

#if 0
  fprintf (fp, "\n# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S");
#endif

  for (i = 0; i < rule_array->len; i++) {
    rule = &g_array_index (rule_array, RuleData, i);

    fprintf (fp, "Rule\t%s\t%s\t", name, dump_year (rule->from_year));

    if (rule->to_year == rule->from_year)
      fprintf (fp, "only\t");
    else
      fprintf (fp, "%s\t", dump_year (rule->to_year));

    fprintf (fp, "%s\t", rule->type ? rule->type : "-");

    fprintf (fp, "%s\t", months[rule->in_month]);

    fprintf (fp, "%s\t",
	     dump_day_coded (rule->on_day_code, rule->on_day_number,
			     rule->on_day_weekday));

    fprintf (fp, "%s\t", dump_time (rule->at_time_seconds, rule->at_time_code,
				    FALSE));

    fprintf (fp, "%s\t", dump_time (rule->save_seconds, TIME_WALL, TRUE));

    fprintf (fp, "%s", rule->letter_s ? rule->letter_s : "-");

    fprintf (fp, "\n");
  }
}


char*
dump_time			(int		 seconds,
				 TimeCode	 time_code,
				 gboolean	 use_zero)
{
  static char buffer[256], *sign;
  int hours, minutes;
  char *code;

  if (time_code == TIME_STANDARD)
    code = "s";
  else if (time_code == TIME_UNIVERSAL)
    code = "u";
  else
    code = "";

  if (seconds < 0) {
    seconds = -seconds;
    sign = "-";
  } else {
    sign = "";
  }

  hours = seconds / 3600;
  minutes = (seconds % 3600) / 60;
  seconds = seconds % 60;

  if (use_zero && hours == 0 && minutes == 0 && seconds == 0)
    return "0";
  else if (seconds == 0)
    sprintf (buffer, "%s%i:%02i%s", sign, hours, minutes, code);
  else
    sprintf (buffer, "%s%i:%02i:%02i%s", sign, hours, minutes, seconds, code);

  return buffer;
}


char*
dump_day_coded			(DayCode	day_code,
				 int		day_number,
				 int		day_weekday)
{
  static char buffer[256];
  static char *weekdays[] = { "Sun", "Mon", "Tue", "Wed",
			      "Thu", "Fri", "Sat" };

  switch (day_code) {
  case DAY_SIMPLE:
    sprintf (buffer, "%i", day_number);
    break;
  case DAY_WEEKDAY_ON_OR_AFTER:
    sprintf (buffer, "%s>=%i", weekdays[day_weekday], day_number);
    break;
  case DAY_WEEKDAY_ON_OR_BEFORE:
    sprintf (buffer, "%s<=%i", weekdays[day_weekday], day_number);
    break;
  case DAY_LAST_WEEKDAY:
    sprintf (buffer, "last%s", weekdays[day_weekday]);
    break;
  default:
    fprintf (stderr, "Invalid day code: %i\n", day_code);
    exit (1);
  }

  return buffer;
}


char*
dump_year			(int		year)
{
  static char buffer[256];

  if (year == YEAR_MINIMUM)
    return "min";
  if (year == YEAR_MAXIMUM)
    return "max";

  sprintf (buffer, "%i", year);
  return buffer;
}


void
dump_time_zone_names		(GList		*names,
				 char		*output_dir,
				 GHashTable	*zones_hash)
{
  char filename[PATHNAME_BUFFER_SIZE], *zone_name, *zone_name_in_hash = NULL;
  char strings_filename[PATHNAME_BUFFER_SIZE];
  FILE *fp, *strings_fp = NULL;
  GList *elem;
  ZoneDescription *zone_desc;

  sprintf (filename, "%s/zones.tab", output_dir);
  sprintf (strings_filename, "%s/zones.h", output_dir);

  fp = fopen (filename, "w");
  if (!fp) {
    fprintf (stderr, "Couldn't create file: %s\n", filename);
    exit (1);
  }

  if (VzicDumpZoneTranslatableStrings) {
    strings_fp = fopen (strings_filename, "w");
    if (!strings_fp) {
      fprintf (stderr, "Couldn't create file: %s\n", strings_filename);
      exit (1);
    }
  }

  names = g_list_sort (names, (GCompareFunc) strcmp);

  elem = names;
  while (elem) {
    zone_name = (char*) elem->data;

    zone_desc = g_hash_table_lookup (zones_hash, zone_name);

    /* SPECIAL CASES: These timezones are links from other zones and are
       almost exactly the same - they are basically there so users can find
       them a bit easier. But they don't have entries in the zone.tab file,
       so we use the entry from the timezone linked from. */
    if (!zone_desc) {
      if (!strcmp (zone_name, "America/Indiana/Indianapolis"))
	zone_name_in_hash = "America/Indianapolis";
      else if (!strcmp (zone_name, "America/Kentucky/Louisville"))
	zone_name_in_hash = "America/Louisville";
      else if (!strcmp (zone_name, "Asia/Istanbul"))
	zone_name_in_hash = "Europe/Istanbul";
      else if (!strcmp (zone_name, "Europe/Nicosia"))
	zone_name_in_hash = "Asia/Nicosia";

      if (zone_name_in_hash)
	zone_desc = g_hash_table_lookup (zones_hash, zone_name_in_hash);
    }

    if (zone_desc) {
      fprintf (fp, "%+04i%02i%02i %+04i%02i%02i %s\n",
	       zone_desc->latitude[0], zone_desc->latitude[1],
	       zone_desc->latitude[2],
	       zone_desc->longitude[0], zone_desc->longitude[1],
	       zone_desc->longitude[2],
	       zone_name);
    } else {
      g_print ("Zone description not found for: %s\n", zone_name);
      fprintf (fp, "%s\n", zone_name);
    }


    if (VzicDumpZoneTranslatableStrings) {
#if 0
      char zone_name_buffer[1024], *src, *dest;

      for (src = zone_name, dest = zone_name_buffer; *src; src++, dest++)
	*dest = (*src == '_') ? ' ' : *src;
      *dest = '\0';
#endif

      fprintf (strings_fp, "N_(\"%s\");\n", zone_name);
    }

    elem = elem->next;
  }

  fclose (fp);

  if (VzicDumpZoneTranslatableStrings)
    fclose (strings_fp);
}