/* Monolith calendar widget.
 * - by Richard W.M. Jones <rich@annexia.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: ml_calendar_lib.c,v 1.5 2003/02/22 12:56:24 rich Exp $
 */

#include "config.h"

#include <stdlib.h>
#include <assert.h>

#ifdef HAVE_TIME_H
#include <time.h>
#endif

#include "ml_calendar_lib.h"

/* Return the current month as a string. */
const char *
_ml_calendar_text_month (int mm)
{
  switch (mm) {
  case 1: return "January";
  case 2: return "February";
  case 3: return "March";
  case 4: return "April";
  case 5: return "May";
  case 6: return "June";
  case 7: return "July";
  case 8: return "August";
  case 9: return "September";
  case 10: return "October";
  case 11: return "November";
  case 12: return "December";
  }
  abort ();
}

/* Return the first weekday of the month (range 0 - 6). I don't know an
 * easier way to do this.
 */
int
_ml_calendar_first_wday_of_month (int mm, int yyyy)
{
  struct tm tm;

  tm.tm_sec = 0;
  tm.tm_min = 0;
  tm.tm_hour = 12;
  tm.tm_mday = 1;
  tm.tm_mon = mm-1;
  tm.tm_year = yyyy-1900;
  tm.tm_wday = -1;
  tm.tm_yday = -1;
  tm.tm_isdst = 0;
  mktime (&tm);
  assert (tm.tm_wday >= 0);
  return tm.tm_wday;
}

/* Map the calendar number to a colour using a fixed table. This isn't
 * very satisfactory. In future we should allow users to choose the
 * colours of calendars.
 */
const char *
_ml_calendar_colour (int resid)
{
  static const char *cols[8] = {
    "black",
    "blue",
    "red",
    "magenta",
    "orange",
    "green",
    "pink",
    "purple"
  };

  return cols[resid & 7];
}