aiguard.c

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/***********************************************************************
 Freeciv - Copyright (C) 2004 - The Freeciv Project
   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, 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.
***********************************************************************/
 
#ifdef HAVE_CONFIG_H
#include <fc_config.h>
#endif
 
/* utility */
#include "log.h"
 
/* common */
#include "game.h"
#include "unit.h"
 
/* server */
#include "srv_log.h"
 
/* ai */
#include "ailog.h"
#include "aiplayer.h"
#include "aitools.h"
#include "aiunit.h"
 
#include "aiguard.h"
 
enum bodyguard_enum {
  BODYGUARD_WANTED = -1,
  BODYGUARD_NONE
};
 
/**********************************************************************/
void aiguard_check_guard(struct ai_type *ait, const struct unit *guard)
{
  struct unit_ai *guard_data = def_ai_unit_data(guard, ait);
  const struct unit *charge_unit = game_unit_by_number(guard_data->charge);
  const struct city *charge_city = game_city_by_number(guard_data->charge);
  const struct player *guard_owner = unit_owner(guard);
  const struct player *charge_owner = NULL;
  struct unit_ai *charge_data = NULL;
 
  fc_assert_ret(BODYGUARD_NONE <= guard_data->charge);
  /* IDs always distinct */
  fc_assert_ret(charge_unit == NULL || charge_city == NULL);
 
  if (charge_unit) {
    charge_owner = unit_owner(charge_unit);
    charge_data = def_ai_unit_data(charge_unit, ait);
  } else if (charge_city) {
    charge_owner = city_owner(charge_city);
  }
 
  if (charge_unit && charge_data->bodyguard != guard->id) {
    BODYGUARD_LOG(ait, LOG_DEBUG, guard, "inconsistent guard references");
  } else if (!charge_unit && !charge_city && 0 < guard_data->charge) {
    BODYGUARD_LOG(ait, LOG_DEBUG, guard, "dangling guard reference");
  }
  if (charge_owner && pplayers_at_war(charge_owner, guard_owner)) {
    /* Probably due to civil war */
    BODYGUARD_LOG(ait, LOG_DEBUG, guard, "enemy charge");
  } else if (charge_owner && charge_owner != guard_owner) {
    /* Probably sold a city with its supported units. */
    BODYGUARD_LOG(ait, LOG_DEBUG, guard, "foreign charge");
  }
}
 
/**********************************************************************/
void aiguard_check_charge_unit(struct ai_type *ait, const struct unit *charge)
{
  struct unit_ai *charge_data = def_ai_unit_data(charge, ait);
  const struct player *charge_owner = unit_owner(charge);
  const struct unit *guard = game_unit_by_number(charge_data->bodyguard);
  struct unit_ai *guard_data = NULL;
 
  if (guard) {
    guard_data = def_ai_unit_data(guard, ait);
  }
 
  fc_assert_ret(guard == NULL
                || (guard_data && BODYGUARD_WANTED <= guard_data->bodyguard));
 
  if (guard && guard_data->charge != charge->id) {
    UNIT_LOG(LOG_DEBUG, charge,
             "inconsistent guard references");
  } else if (guard && unit_owner(guard) != charge_owner) {
    UNIT_LOG(LOG_DEBUG, charge, "foreign guard");
  }
}
 
/**********************************************************************/
void aiguard_clear_charge(struct ai_type *ait, struct unit *guard)
{
  struct unit_ai *guard_data = def_ai_unit_data(guard, ait);
  struct unit *charge_unit = game_unit_by_number(guard_data->charge);
  struct city *charge_city = game_city_by_number(guard_data->charge);
 
  /* IDs always distinct */
  fc_assert_ret(charge_unit == NULL || charge_city == NULL);
 
  if (charge_unit) {
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "unassigned (unit)");
    def_ai_unit_data(charge_unit, ait)->bodyguard = BODYGUARD_NONE;
  } else if (charge_city) {
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "unassigned (city)");
  }
  /* else not assigned or charge was destroyed */
  guard_data->charge = BODYGUARD_NONE;
 
  CHECK_GUARD(ait, guard);
}
 
/**********************************************************************/
void aiguard_clear_guard(struct ai_type *ait, struct unit *charge)
{
  struct unit_ai *charge_data = def_ai_unit_data(charge, ait);
 
  if (0 < charge_data->bodyguard) {
    struct unit *guard = game_unit_by_number(charge_data->bodyguard);
 
    if (guard) {
      struct unit_ai *guard_data = def_ai_unit_data(guard, ait);
 
      if (guard_data->charge == charge->id) {
        /* charge doesn't want us anymore */
        guard_data->charge = BODYGUARD_NONE;
      }
    }
  }
 
  charge_data->bodyguard = BODYGUARD_NONE;
 
  CHECK_CHARGE_UNIT(ait, charge);
}
 
/**********************************************************************/
void aiguard_assign_guard_unit(struct ai_type *ait, struct unit *charge,
                               struct unit *guard)
{
  fc_assert_ret(NULL != charge);
  fc_assert_ret(NULL != guard);
  fc_assert_ret(charge != guard);
  fc_assert_ret(unit_owner(charge) == unit_owner(guard));
 
  /* Remove previous assignment: */
  aiguard_clear_charge(ait, guard);
  aiguard_clear_guard(ait, charge);
 
  def_ai_unit_data(guard, ait)->charge = charge->id;
  def_ai_unit_data(charge, ait)->bodyguard = guard->id;
 
  BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "assigned charge");
  CHECK_GUARD(ait, guard);
  CHECK_CHARGE_UNIT(ait, charge);
}
 
/**********************************************************************/
void aiguard_assign_guard_city(struct ai_type *ait, struct city *charge,
                               struct unit *guard)
{
  struct unit_ai *guard_data = def_ai_unit_data(guard, ait);
 
  fc_assert_ret(charge != NULL);
  fc_assert_ret(guard != NULL);
  /*
   * Usually, but not always, city_owner(charge) == unit_owner(guard).
   */
 
  if (0 < guard_data->charge
      && guard_data->charge != charge->id) {
    /* Remove previous assignment: */
    aiguard_clear_charge(ait, guard);
  }
 
  guard_data->charge = charge->id;
  if (city_owner(charge) != unit_owner(guard)) {
    /* Peculiar, but not always an error */
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "assigned foreign charge");
  } else {
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "assigned charge");
  }
 
  CHECK_GUARD(ait, guard);
}
 
/**********************************************************************/
void aiguard_request_guard(struct ai_type *ait, struct unit *punit)
{
  /* Remove previous assignment */
  aiguard_clear_guard(ait, punit);
 
  UNIT_LOG(LOGLEVEL_BODYGUARD, punit, "requests a guard");
  def_ai_unit_data(punit, ait)->bodyguard = BODYGUARD_WANTED;
 
  CHECK_CHARGE_UNIT(ait, punit);
}
 
/**********************************************************************/
bool aiguard_wanted(struct ai_type *ait, struct unit *charge)
{
  CHECK_CHARGE_UNIT(ait, charge);
  return (def_ai_unit_data(charge, ait)->bodyguard == BODYGUARD_WANTED);
}
 
/**********************************************************************/
bool aiguard_has_charge(struct ai_type *ait, struct unit *guard)
{
  CHECK_GUARD(ait, guard);
  return (def_ai_unit_data(guard, ait)->charge != BODYGUARD_NONE);
}
 
/**********************************************************************/
bool aiguard_has_guard(struct ai_type *ait, struct unit *charge)
{
  CHECK_CHARGE_UNIT(ait, charge);
  return (0 < def_ai_unit_data(charge, ait)->bodyguard);
}
 
/**********************************************************************/
struct unit *aiguard_guard_of(struct ai_type *ait, struct unit *charge)
{
  CHECK_CHARGE_UNIT(ait, charge);
  return game_unit_by_number(def_ai_unit_data(charge, ait)->bodyguard);
}
 
/**********************************************************************/
struct unit *aiguard_charge_unit(struct ai_type *ait, struct unit *guard)
{
  CHECK_GUARD(ait, guard);
  return game_unit_by_number(def_ai_unit_data(guard, ait)->charge);
}
 
/**********************************************************************/
struct city *aiguard_charge_city(struct ai_type *ait, struct unit *guard)
{
  CHECK_GUARD(ait, guard);
  return game_city_by_number(def_ai_unit_data(guard, ait)->charge);
}
 
/**********************************************************************/
void aiguard_update_charge(struct ai_type *ait, struct unit *guard)
{
  struct unit_ai *guard_data = def_ai_unit_data(guard, ait);
  const struct unit *charge_unit = game_unit_by_number(guard_data->charge);
  const struct city *charge_city = game_city_by_number(guard_data->charge);
  const struct player *guard_owner = unit_owner(guard);
  const struct player *charge_owner = NULL;
 
  fc_assert_ret(BODYGUARD_NONE <= guard_data->charge);
  /* IDs always distinct */
  fc_assert_ret(charge_unit == NULL || charge_city == NULL);
 
  if (charge_unit) {
    charge_owner = unit_owner(charge_unit);
  } else if (charge_city) {
    charge_owner = city_owner(charge_city);
  }
 
  if (!charge_unit && !charge_city && 0 < guard_data->charge) {
    guard_data->charge = BODYGUARD_NONE;
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "charge was destroyed");
  }
  if (charge_owner && charge_owner != guard_owner) {
    BODYGUARD_LOG(ait, LOGLEVEL_BODYGUARD, guard, "charge transferred, dismiss");
    aiguard_clear_charge(ait, guard);
  }
 
  CHECK_GUARD(ait, guard);
}