/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2002 Tim Rightnour
    Copyright (C) 2002 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    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.

    The authors can be reached via e-mail to <crossfire@schmorp.de>
*/

/* This weather system was written for crossfire by Tim Rightnour */

#include <global.h>
#include <tod.h>
#include <map.h>
#ifndef __CEXTRACT__
# include <sproto.h>
#endif

extern unsigned long todtick;

static const int season_timechange[5][HOURS_PER_DAY] = {
  /* 0  1   2   3   4   5   6   7   8   9  10  11  12  13  14   1   2   3   4   5   6   7   8   9  10  11  12  13 */
  { 0,  0,  0,  0,  0,  0,  0, -1, -1, -1, -1, -1, -1, -1, -1,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  1,  1},
  { 0,  0,  0,  0,  0,  0, -1, -1, -1, -1, -1, -1, -1,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  1,  0},
  { 0,  0,  0,  0,  0, -1, -1, -1, -1, -1, -1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  0},
  { 0,  0,  0,  0,  0, -1, -1, -1, -1, -1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  0},
  { 0,  0,  0,  0,  0,  0, -1, -1, -1, -1, -1, -1,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  0}
};

void
maptile::set_darkness_map ()
{
  timeofday_t tod;

  if (!outdoor)
    return;

  get_tod (&tod);
  darkness = 0;

  for (int i = HOURS_PER_DAY / 2; i < HOURS_PER_DAY; i++)
    change_map_light (season_timechange[tod.season][i]);

  for (int i = 0; i <= tod.hour; i++)
    change_map_light (season_timechange[tod.season][i]);
}

/*
 * Compute the darkness level for all maps in the game.  Requires the
 * time of day as an argument.
 */

static void
dawn_to_dusk (const timeofday_t * tod)
{
  /* If the light level isn't changing, no reason to do all
   * the work below.
   */
  if (season_timechange[tod->season][tod->hour] == 0)
    return;

  maptile::change_all_map_light (season_timechange[tod->season][tod->hour]);
}

/*
 * This performs the basic function of advancing the clock one tick
 * forward.  Every 20 ticks, the clock is saved to disk.  It is also
 * saved on shutdown.  Any time dependant functions should be called
 * from this function, and probably be passed tod as an argument.
 * Please don't modify tod in the dependant function.
 */
void
tick_the_clock (void)
{
  timeofday_t tod;

  todtick++;
  if (todtick % 20 == 0)
    write_todclock ();

  get_tod (&tod);
  dawn_to_dusk (&tod);
}