unit_utils.cpp

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// SPDX-FileCopyrightText: 1996-2021 Freeciv contributors
// SPDX-FileCopyrightText: 1996-2021 Freeciv21 contributors
// SPDX-FileCopyrightText: 2022 Louis Moureaux
// SPDX-License-Identifier: GPL-3.0-or-later
 
#include "unit_utils.h"
 
#include "game.h"
#include "tile.h"
#include "unit.h"
 
static int hp_gain_coord(struct unit *punit)
{
  int bonus, hp;
  const int base = unit_type_get(punit)->hp;
 
  // Includes barracks (100%), fortress (25%), etc.
  bonus = get_unit_bonus(punit, EFT_HP_REGEN);
  bonus = MAX(bonus, get_unit_bonus(punit, EFT_HP_REGEN_MIN));
  if (bonus <= 0)
    return 0;
  hp = (base - 1) * bonus / 100 + 1; // rounds up
 
  return MAX(hp, 0);
}
 
void unit_restore_hitpoints(struct unit *punit)
{
  bool was_lower;
  int save_hp;
  struct unit_class *pclass = unit_class_get(punit);
  struct city *pcity = tile_city(unit_tile(punit));
 
  was_lower = (punit->hp < unit_type_get(punit)->hp);
  save_hp = punit->hp;
 
  if (!punit->moved) {
    punit->hp += hp_gain_coord(punit);
  }
 
  // Bonus recovery HP (traditionally from the United Nations)
  punit->hp += get_unit_bonus(punit, EFT_UNIT_RECOVER);
 
  if (!punit->homecity && 0 < game.info.killunhomed
      && !unit_has_type_flag(punit, UTYF_GAMELOSS)) {
    // Hit point loss of units without homecity; at least 1 hp!
    // Gameloss units are immune to this effect.
    int hp_loss =
        MAX(unit_type_get(punit)->hp * game.info.killunhomed / 100, 1);
    punit->hp = MIN(punit->hp - hp_loss, save_hp - 1);
  }
 
  if (!pcity && !tile_has_native_base(unit_tile(punit), unit_type_get(punit))
      && !unit_transported(punit)) {
    punit->hp -= unit_type_get(punit)->hp * pclass->hp_loss_pct / 100;
  }
 
  if (punit->hp >= unit_type_get(punit)->hp) {
    punit->hp = unit_type_get(punit)->hp;
    if (was_lower && punit->activity == ACTIVITY_SENTRY) {
      set_unit_activity(punit, ACTIVITY_IDLE);
    }
  }
 
  if (punit->hp < 0) {
    punit->hp = 0;
  }
 
  punit->moved = false;
  punit->paradropped = false;
}