/* vi: set ts=2:
 *
 * 
 * Eressea PB(E)M host Copyright (C) 1998-2003
 *      Christian Schlittchen (corwin@amber.kn-bremen.de)
 *      Katja Zedel (katze@felidae.kn-bremen.de)
 *      Henning Peters (faroul@beyond.kn-bremen.de)
 *      Enno Rehling (enno@eressea.de)
 *      Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
 *
 * This program may not be used, modified or distributed without
 * prior permission by the authors of Eressea.
 */

#include <platform.h>
#include <kernel/config.h>

/* kernel includes */
#include <kernel/unit.h>
#include <kernel/faction.h>
#include <kernel/region.h>

/* util iclude */
#include <util/rng.h>

/* libc includes */
#include <stdlib.h>

#define UNDEAD_MIN                  90	/* mind. zahl vor weg gehen */
#define UNDEAD_BREAKUP              25	/* chance dafuer */
#define UNDEAD_BREAKUP_FRACTION     (25+rng_int()%70)	/* anteil der weg geht */

#define age_chance(a,b,p) (MAX(0,a-b)*p)

void
age_undead(unit *u)
{
  region *r = u->region;
  int n = 0;

  /* untote, die einer partei angehoeren, koennen sich
  * absplitten, anstatt sich zu vermehren. monster
  * untote vermehren sich nur noch */

  if (u->number > UNDEAD_MIN && !is_monsters(u->faction) && rng_int() % 100 < UNDEAD_BREAKUP) {
    int m;
    unit *u2;

    n = 0;
    for (m = u->number; m; m--) {
      if (rng_int() % 100 < UNDEAD_BREAKUP_FRACTION) ++n;
    }
    u2 = create_unit(r, get_monsters(), 0, new_race[RC_UNDEAD], 0, NULL, u);
    make_undead_unit(u2);
    transfermen(u, u2, u->number - n);
  }
}

void
age_skeleton(unit *u)
{
  if (is_monsters(u->faction) && rng_int()%100 < age_chance(u->age, 27, 1)) {
    int n = MAX(1,u->number/2);
    double q = (double) u->hp / (double) (unit_max_hp(u) * u->number);
    u->race = new_race[RC_SKELETON_LORD];
    u->irace = NULL;
    scale_number(u,n);
    u->hp = (int) (unit_max_hp(u) * u->number * q);
  }
}

void
age_zombie(unit *u)
{
  if (is_monsters(u->faction) && rng_int()%100 < age_chance(u->age, 27, 1)) {
    int n = MAX(1,u->number/2);
    double q = (double) u->hp / (double) (unit_max_hp(u) * u->number);
    u->race = new_race[RC_ZOMBIE_LORD];
    u->irace = NULL;
    scale_number(u,n);
    u->hp = (int) (unit_max_hp(u) * u->number * q);
  }
}

void
age_ghoul(unit *u)
{
  if (is_monsters(u->faction) && rng_int()%100 < age_chance(u->age, 27, 1)) {
    int n = MAX(1,u->number/2);
    double q = (double) u->hp / (double) (unit_max_hp(u) * u->number);
    u->race = new_race[RC_GHOUL_LORD];
    u->irace = NULL;
    scale_number(u,n);
    u->hp = (int) (unit_max_hp(u) * u->number * q);
  }
}