[hengband/hengband.git] / src / mspell / mspells1.c

/*!
 * @brief モンスター魔法の実装 / Monster spells (attack player)
 * @date 2014/01/17
 * @author
 * Copyright (c) 1997 Ben Harrison, James E. Wilson, Robert A. Koeneke
 * This software may be copied and distributed for educational, research,
 * and not for profit purposes provided that this copyright and statement
 * are included in all such copies.  Other copyrights may also apply.
 * 2014 Deskull rearranged comment for Doxygen.
 */

#include "system/angband.h"
#include "dungeon/dungeon.h"
#include "dungeon/quest.h"
#include "effect/effect-characteristics.h"
#include "game-option/birth-options.h"
#include "grid/grid.h"
#include "monster-race/race-flags-ability1.h"
#include "monster-race/race-flags-ability2.h"
#include "monster-race/race-flags-resistance.h"
#include "monster-race/race-flags2.h"
#include "monster-race/race-flags3.h"
#include "monster-race/race-flags4.h"
#include "monster-race/race-flags7.h"
#include "monster-race/race-flags9.h"
#include "monster-race/race-indice-types.h"
#include "monster/monster-describer.h"
#include "monster/monster-description-types.h"
#include "monster/monster-flag-types.h"
#include "monster/monster-info.h"
#include "monster-floor/monster-move.h"
#include "monster/monster-status.h"
#include "monster/smart-learn-types.h"
#include "mspell/assign-monster-spell.h"
#include "mspell/monster-spell.h"
#include "mspell/mspell-learn-checker.h"
#include "object-enchant/object-curse.h"
#include "player/player-class.h"
#include "player/player-move.h"
#include "player/player-race-types.h"
#include "player/player-status.h"
#include "realm/realm-song-numbers.h"
#include "spell-kind/spells-teleport.h"
#include "spell-realm/spells-hex.h"
#include "spell/process-effect.h"
#include "spell/range-calc.h"
#include "spell/spell-types.h"
#include "util/bit-flags-calculator.h"
#include "view/display-main-window.h"
#include "view/display-messages.h"
#include "world/world.h"

#define DO_SPELL_NONE    0
#define DO_SPELL_BR_LITE 1
#define DO_SPELL_BR_DISI 2
#define DO_SPELL_BA_LITE 3

 /*!
  * @brief モンスターがプレイヤーの弱点をついた選択を取るかどうかの判定 /
  * Internal probability routine
  * @param r_ptr モンスター種族の構造体参照ポインタ
  * @param prob 基本確率(%)
  * @return 適した選択を取るならばTRUEを返す。
  */
static bool int_outof(monster_race *r_ptr, PERCENTAGE prob)
{
        /* Non-Smart monsters are half as "smart" */
        if (!(r_ptr->flags2 & RF2_SMART)) prob = prob / 2;

        /* Roll the dice */
        return (randint0(100) < prob);
}


/*!
 * @brief モンスターの魔法一覧から戦術的に適さない魔法を除外する /
 * Remove the "bad" spells from a spell list
 * @param m_idx モンスターの構造体参照ポインタ
 * @param f4p モンスター魔法のフラグリスト1
 * @param f5p モンスター魔法のフラグリスト2
 * @param f6p モンスター魔法のフラグリスト3
 * @return なし
 */
static void remove_bad_spells(MONSTER_IDX m_idx, player_type *target_ptr, u32b *f4p, u32b *f5p, u32b *f6p)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        u32b f4 = (*f4p);
        u32b f5 = (*f5p);
        u32b f6 = (*f6p);

        u32b smart = 0L;

        /* Too stupid to know anything */
        if (r_ptr->flags2 & RF2_STUPID) return;


        /* Must be cheating or learning */
        if (!smart_cheat && !smart_learn) return;


        /* Update acquired knowledge */
        if (smart_learn)
        {
                /* Hack -- Occasionally forget player status */
                /* Only save SM_FRIENDLY, SM_PET or SM_CLONED */
                if (m_ptr->smart && (randint0(100) < 1)) m_ptr->smart &= (SM_FRIENDLY | SM_PET | SM_CLONED);

                /* Use the memorized flags */
                smart = m_ptr->smart;
        }


        /* Cheat if requested */
        if (smart_cheat)
        {
                /* Know element info */
                if (target_ptr->resist_acid) smart |= (SM_RES_ACID);
                if (is_oppose_acid(target_ptr)) smart |= (SM_OPP_ACID);
                if (target_ptr->immune_acid) smart |= (SM_IMM_ACID);
                if (target_ptr->resist_elec) smart |= (SM_RES_ELEC);
                if (is_oppose_elec(target_ptr)) smart |= (SM_OPP_ELEC);
                if (target_ptr->immune_elec) smart |= (SM_IMM_ELEC);
                if (target_ptr->resist_fire) smart |= (SM_RES_FIRE);
                if (is_oppose_fire(target_ptr)) smart |= (SM_OPP_FIRE);
                if (target_ptr->immune_fire) smart |= (SM_IMM_FIRE);
                if (target_ptr->resist_cold) smart |= (SM_RES_COLD);
                if (is_oppose_cold(target_ptr)) smart |= (SM_OPP_COLD);
                if (target_ptr->immune_cold) smart |= (SM_IMM_COLD);
                if (target_ptr->resist_pois) smart |= (SM_RES_POIS);
                if (is_oppose_pois(target_ptr)) smart |= (SM_OPP_POIS);

                /* Know special resistances */
                if (target_ptr->resist_neth) smart |= (SM_RES_NETH);
                if (target_ptr->resist_lite) smart |= (SM_RES_LITE);
                if (target_ptr->resist_dark) smart |= (SM_RES_DARK);
                if (target_ptr->resist_fear) smart |= (SM_RES_FEAR);
                if (target_ptr->resist_conf) smart |= (SM_RES_CONF);
                if (target_ptr->resist_chaos) smart |= (SM_RES_CHAOS);
                if (target_ptr->resist_disen) smart |= (SM_RES_DISEN);
                if (target_ptr->resist_blind) smart |= (SM_RES_BLIND);
                if (target_ptr->resist_nexus) smart |= (SM_RES_NEXUS);
                if (target_ptr->resist_sound) smart |= (SM_RES_SOUND);
                if (target_ptr->resist_shard) smart |= (SM_RES_SHARD);
                if (target_ptr->reflect) smart |= (SM_IMM_REFLECT);

                /* Know bizarre "resistances" */
                if (target_ptr->free_act) smart |= (SM_IMM_FREE);
                if (!target_ptr->msp) smart |= (SM_IMM_MANA);
        }

        if (!smart) return;

        if (smart & SM_IMM_ACID)
        {
                f4 &= ~(RF4_BR_ACID);
                f5 &= ~(RF5_BA_ACID);
                f5 &= ~(RF5_BO_ACID);
        }
        else if ((smart & (SM_OPP_ACID)) && (smart & (SM_RES_ACID)))
        {
                if (int_outof(r_ptr, 80)) f4 &= ~(RF4_BR_ACID);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BA_ACID);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BO_ACID);
        }
        else if ((smart & (SM_OPP_ACID)) || (smart & (SM_RES_ACID)))
        {
                if (int_outof(r_ptr, 30)) f4 &= ~(RF4_BR_ACID);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BA_ACID);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BO_ACID);
        }


        if (smart & (SM_IMM_ELEC))
        {
                f4 &= ~(RF4_BR_ELEC);
                f5 &= ~(RF5_BA_ELEC);
                f5 &= ~(RF5_BO_ELEC);
        }
        else if ((smart & (SM_OPP_ELEC)) && (smart & (SM_RES_ELEC)))
        {
                if (int_outof(r_ptr, 80)) f4 &= ~(RF4_BR_ELEC);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BA_ELEC);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BO_ELEC);
        }
        else if ((smart & (SM_OPP_ELEC)) || (smart & (SM_RES_ELEC)))
        {
                if (int_outof(r_ptr, 30)) f4 &= ~(RF4_BR_ELEC);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BA_ELEC);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BO_ELEC);
        }

        if (smart & (SM_IMM_FIRE))
        {
                f4 &= ~(RF4_BR_FIRE);
                f5 &= ~(RF5_BA_FIRE);
                f5 &= ~(RF5_BO_FIRE);
        }
        else if ((smart & (SM_OPP_FIRE)) && (smart & (SM_RES_FIRE)))
        {
                if (int_outof(r_ptr, 80)) f4 &= ~(RF4_BR_FIRE);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BA_FIRE);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BO_FIRE);
        }
        else if ((smart & (SM_OPP_FIRE)) || (smart & (SM_RES_FIRE)))
        {
                if (int_outof(r_ptr, 30)) f4 &= ~(RF4_BR_FIRE);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BA_FIRE);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BO_FIRE);
        }

        if (smart & (SM_IMM_COLD))
        {
                f4 &= ~(RF4_BR_COLD);
                f5 &= ~(RF5_BA_COLD);
                f5 &= ~(RF5_BO_COLD);
                f5 &= ~(RF5_BO_ICEE);
        }
        else if ((smart & (SM_OPP_COLD)) && (smart & (SM_RES_COLD)))
        {
                if (int_outof(r_ptr, 80)) f4 &= ~(RF4_BR_COLD);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BA_COLD);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BO_COLD);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BO_ICEE);
        }
        else if ((smart & (SM_OPP_COLD)) || (smart & (SM_RES_COLD)))
        {
                if (int_outof(r_ptr, 30)) f4 &= ~(RF4_BR_COLD);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BA_COLD);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BO_COLD);
                if (int_outof(r_ptr, 20)) f5 &= ~(RF5_BO_ICEE);
        }

        if ((smart & (SM_OPP_POIS)) && (smart & (SM_RES_POIS)))
        {
                if (int_outof(r_ptr, 80)) f4 &= ~(RF4_BR_POIS);
                if (int_outof(r_ptr, 80)) f5 &= ~(RF5_BA_POIS);
                if (int_outof(r_ptr, 60)) f4 &= ~(RF4_BA_NUKE);
                if (int_outof(r_ptr, 60)) f4 &= ~(RF4_BR_NUKE);
        }
        else if ((smart & (SM_OPP_POIS)) || (smart & (SM_RES_POIS)))
        {
                if (int_outof(r_ptr, 30)) f4 &= ~(RF4_BR_POIS);
                if (int_outof(r_ptr, 30)) f5 &= ~(RF5_BA_POIS);
        }

        if (smart & (SM_RES_NETH))
        {
                if (is_specific_player_race(target_ptr, RACE_SPECTRE))
                {
                        f4 &= ~(RF4_BR_NETH);
                        f5 &= ~(RF5_BA_NETH);
                        f5 &= ~(RF5_BO_NETH);
                }
                else
                {
                        if (int_outof(r_ptr, 20)) f4 &= ~(RF4_BR_NETH);
                        if (int_outof(r_ptr, 50)) f5 &= ~(RF5_BA_NETH);
                        if (int_outof(r_ptr, 50)) f5 &= ~(RF5_BO_NETH);
                }
        }

        if (smart & (SM_RES_LITE))
        {
                if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BR_LITE);
                if (int_outof(r_ptr, 50)) f5 &= ~(RF5_BA_LITE);
        }

        if (smart & (SM_RES_DARK))
        {
                if (is_specific_player_race(target_ptr, RACE_VAMPIRE))
                {
                        f4 &= ~(RF4_BR_DARK);
                        f5 &= ~(RF5_BA_DARK);
                }
                else
                {
                        if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BR_DARK);
                        if (int_outof(r_ptr, 50)) f5 &= ~(RF5_BA_DARK);
                }
        }

        if (smart & (SM_RES_FEAR))
        {
                f5 &= ~(RF5_SCARE);
        }

        if (smart & (SM_RES_CONF))
        {
                f5 &= ~(RF5_CONF);
                if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BR_CONF);
        }

        if (smart & (SM_RES_CHAOS))
        {
                if (int_outof(r_ptr, 20)) f4 &= ~(RF4_BR_CHAO);
                if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BA_CHAO);
        }

        if (smart & (SM_RES_DISEN))
        {
                if (int_outof(r_ptr, 40)) f4 &= ~(RF4_BR_DISE);
        }

        if (smart & (SM_RES_BLIND))
        {
                f5 &= ~(RF5_BLIND);
        }

        if (smart & (SM_RES_NEXUS))
        {
                if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BR_NEXU);
                f6 &= ~(RF6_TELE_LEVEL);
        }

        if (smart & (SM_RES_SOUND))
        {
                if (int_outof(r_ptr, 50)) f4 &= ~(RF4_BR_SOUN);
        }

        if (smart & (SM_RES_SHARD))
        {
                if (int_outof(r_ptr, 40)) f4 &= ~(RF4_BR_SHAR);
        }

        if (smart & (SM_IMM_REFLECT))
        {
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_COLD);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_FIRE);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_ACID);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_ELEC);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_NETH);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_WATE);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_MANA);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_PLAS);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_BO_ICEE);
                if (int_outof(r_ptr, 150)) f5 &= ~(RF5_MISSILE);
        }

        if (smart & (SM_IMM_FREE))
        {
                f5 &= ~(RF5_HOLD);
                f5 &= ~(RF5_SLOW);
        }

        if (smart & (SM_IMM_MANA))
        {
                f5 &= ~(RF5_DRAIN_MANA);
        }

        /* No spells left? */
        /* if (!f4 && !f5 && !f6) ... */

        (*f4p) = f4;
        (*f5p) = f5;
        (*f6p) = f6;
}


/*!
 * @brief モンスターにとって所定の地点が召還に相応しい地点かどうかを返す。 /
 * Determine if there is a space near the player in which a summoned creature can appear
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param y1 判定を行いたいマスのY座標
 * @param x1 判定を行いたいマスのX座標
 * @return 召還に相応しいならばTRUEを返す
 */
bool summon_possible(player_type *target_ptr, POSITION y1, POSITION x1)
{
        POSITION y, x;

        /* Start at the player's location, and check 2 grids in each dir */
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        for (y = y1 - 2; y <= y1 + 2; y++)
        {
                for (x = x1 - 2; x <= x1 + 2; x++)
                {
                        /* Ignore illegal locations */
                        if (!in_bounds(floor_ptr, y, x)) continue;

                        /* Only check a circular area */
                        if (distance(y1, x1, y, x) > 2) continue;

                        /* ...nor on the Pattern */
                        if (pattern_tile(floor_ptr, y, x)) continue;

                        /* Require empty floor grid in line of projection */
                        if (is_cave_empty_bold(target_ptr, y, x) && projectable(target_ptr, y1, x1, y, x) && projectable(target_ptr, y, x, y1, x1)) return TRUE;
                }
        }

        return FALSE;
}


/*!
 * @brief モンスターにとって死者復活を行うべき状態かどうかを返す /
 * Determine if there is a space near the player in which a summoned creature can appear
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_ptr 判定を行いたいモンスターの構造体参照ポインタ
 * @return 死者復活が有効な状態ならばTRUEを返す。
 */
bool raise_possible(player_type *target_ptr, monster_type *m_ptr)
{
        POSITION y = m_ptr->fy;
        POSITION x = m_ptr->fx;
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        for (POSITION xx = x - 5; xx <= x + 5; xx++)
        {
                grid_type *g_ptr;
                for (POSITION yy = y - 5; yy <= y + 5; yy++)
                {
                        if (distance(y, x, yy, xx) > 5) continue;
                        if (!los(target_ptr, y, x, yy, xx)) continue;
                        if (!projectable(target_ptr, y, x, yy, xx)) continue;

                        g_ptr = &floor_ptr->grid_array[yy][xx];
                        /* Scan the pile of objects */
                        OBJECT_IDX this_o_idx, next_o_idx = 0;
                        for (this_o_idx = g_ptr->o_idx; this_o_idx; this_o_idx = next_o_idx)
                        {
                                object_type *o_ptr = &floor_ptr->o_list[this_o_idx];
                                next_o_idx = o_ptr->next_o_idx;

                                /* Known to be worthless? */
                                if (o_ptr->tval == TV_CORPSE)
                                {
                                        if (!monster_has_hostile_align(target_ptr, m_ptr, 0, 0, &r_info[o_ptr->pval])) return TRUE;
                                }
                        }
                }
        }

        return FALSE;
}


/*!
 * @brief モンスターにとってボルト型魔法が有効な状態かを返す /
 * Determine if a bolt spell will hit the player.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param y1 ボルト魔法発射地点のY座標
 * @param x1 ボルト魔法発射地点のX座標
 * @param y2 ボルト魔法目標地点のY座標
 * @param x2 ボルト魔法目標地点のX座標
 * @param is_friend モンスターがプレイヤーに害意を持たない(ペットか友好的)ならばTRUEをつける
 * @return ボルト型魔法が有効ならばTRUEを返す。
 * @details
 * Originally, it was possible for a friendly to shoot another friendly.\n
 * Change it so a "clean shot" means no equally friendly monster is\n
 * between the attacker and target.\n
 *\n
 * This is exactly like "projectable", but it will\n
 * return FALSE if a monster is in the way.\n
 * no equally friendly monster is\n
 * between the attacker and target.\n
 */
bool clean_shot(player_type *target_ptr, POSITION y1, POSITION x1, POSITION y2, POSITION x2, bool is_friend)
{
        /* Check the projection path */
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        u16b grid_g[512];
        int grid_n = project_path(target_ptr, grid_g, MAX_RANGE, y1, x1, y2, x2, 0);

        /* No grid is ever projectable from itself */
        if (!grid_n) return FALSE;

        /* Final grid */
        POSITION y = GRID_Y(grid_g[grid_n - 1]);
        POSITION x = GRID_X(grid_g[grid_n - 1]);

        /* May not end in an unrequested grid */
        if ((y != y2) || (x != x2)) return FALSE;

        for (int i = 0; i < grid_n; i++)
        {
                y = GRID_Y(grid_g[i]);
                x = GRID_X(grid_g[i]);

                if ((floor_ptr->grid_array[y][x].m_idx > 0) && !((y == y2) && (x == x2)))
                {
                        monster_type *m_ptr = &floor_ptr->m_list[floor_ptr->grid_array[y][x].m_idx];
                        if (is_friend == is_pet(m_ptr))
                        {
                                return FALSE;
                        }
                }

                /* Pets may not shoot through the character - TNB */
                if (player_bold(target_ptr, y, x) && is_friend) return FALSE;
        }

        return TRUE;
}


/*!
 * @brief モンスターのボルト型魔法処理 /
 * Cast a bolt at the player Stop if we hit a monster Affect monsters and the player
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターのID
 * @param y 目標のY座標
 * @param x 目標のX座標
 * @param typ 効果属性ID
 * @param dam_hp 威力
 * @param monspell モンスター魔法のID
 * @param target_type モンスターからモンスターへ撃つならMONSTER_TO_MONSTER、モンスターからプレイヤーならMONSTER_TO_PLAYER
 * @return なし
 */
void bolt(player_type *target_ptr, MONSTER_IDX m_idx, POSITION y, POSITION x, EFFECT_ID typ, int dam_hp, int monspell, int target_type)
{
        BIT_FLAGS flg = 0;
        switch (target_type)
        {
        case MONSTER_TO_MONSTER:
                flg = PROJECT_STOP | PROJECT_KILL;
                break;
        case MONSTER_TO_PLAYER:
                flg = PROJECT_STOP | PROJECT_KILL | PROJECT_PLAYER;
                break;
        }

        /* Target the player with a bolt attack */
        if (typ != GF_ARROW) flg |= PROJECT_REFLECTABLE;
        bool learnable = spell_learnable(target_ptr, m_idx);
        (void)project(target_ptr, m_idx, 0, y, x, dam_hp, typ, flg, (learnable ? monspell : -1));
}


/*!
 * @brief モンスターのビーム型魔法処理 /
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターのID
 * @param y 目標のY座標
 * @param x 目標のX座標
 * @param typ 効果属性ID
 * @param dam_hp 威力
 * @param monspell モンスター魔法のID
 * @param target_type モンスターからモンスターへ撃つならMONSTER_TO_MONSTER、モンスターからプレイヤーならMONSTER_TO_PLAYER
 * @return なし
 */
void beam(player_type *target_ptr, MONSTER_IDX m_idx, POSITION y, POSITION x, EFFECT_ID typ, int dam_hp, int monspell, int target_type)
{
        BIT_FLAGS flg = 0;
        switch (target_type)
        {
        case MONSTER_TO_MONSTER:
                flg = PROJECT_BEAM | PROJECT_KILL | PROJECT_THRU;
                break;
        case MONSTER_TO_PLAYER:
                flg = PROJECT_BEAM | PROJECT_KILL | PROJECT_THRU | PROJECT_PLAYER;
                break;
        }

        /* Target the player with a bolt attack */
        bool learnable = spell_learnable(target_ptr, m_idx);
        (void)project(target_ptr, m_idx, 0, y, x, dam_hp, typ, flg, (learnable ? monspell : -1));
}


/*!
 * @brief モンスターのボール型＆ブレス型魔法処理 /
 * Cast a breath (or ball) attack at the player Pass over any monsters that may be in the way Affect grids, objects, monsters, and the player
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param y 目標地点のY座標
 * @param x 目標地点のX座標
 * @param m_idx モンスターのID
 * @param typ 効果属性ID
 * @param dam_hp 威力
 * @param rad 半径
 * @param breath
 * @param monspell モンスター魔法のID
 * @param target_type モンスターからモンスターへ撃つならMONSTER_TO_MONSTER、モンスターからプレイヤーならMONSTER_TO_PLAYER
 * @return なし
 */
void breath(player_type *target_ptr, POSITION y, POSITION x, MONSTER_IDX m_idx, EFFECT_ID typ, int dam_hp, POSITION rad, bool breath, int monspell, int target_type)
{
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        BIT_FLAGS flg = 0x00;
        switch (target_type)
        {
        case MONSTER_TO_MONSTER:
                flg = PROJECT_GRID | PROJECT_ITEM | PROJECT_KILL;
                break;
        case MONSTER_TO_PLAYER:
                flg = PROJECT_GRID | PROJECT_ITEM | PROJECT_KILL | PROJECT_PLAYER;
                break;
        }

        /* Determine the radius of the blast */
        if ((rad < 1) && breath) rad = (r_ptr->flags2 & (RF2_POWERFUL)) ? 3 : 2;

        /* Handle breath attacks */
        if (breath) rad = 0 - rad;

        switch (typ)
        {
        case GF_ROCKET:
                flg |= PROJECT_STOP;
                break;
        case GF_DRAIN_MANA:
        case GF_MIND_BLAST:
        case GF_BRAIN_SMASH:
        case GF_CAUSE_1:
        case GF_CAUSE_2:
        case GF_CAUSE_3:
        case GF_CAUSE_4:
        case GF_HAND_DOOM:
                flg |= (PROJECT_HIDE | PROJECT_AIMED);
                break;
        }

        /* Target the player with a ball attack */
        bool learnable = spell_learnable(target_ptr, m_idx);
        (void)project(target_ptr, m_idx, rad, y, x, dam_hp, typ, flg, (learnable ? monspell : -1));
}


/*!
 * @brief ID値が正しいモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell is good for hurting the player (directly).
 * @param spell 判定対象のID
 * @return 正しいIDならばTRUEを返す。
 */
static bool spell_attack(byte spell)
{
        /* All RF4 spells hurt (except for shriek and dispel) */
        if (spell < 128 && spell > 98) return TRUE;

        /* Various "ball" spells */
        if (spell >= 128 && spell <= 128 + 8) return TRUE;

        /* "Cause wounds" and "bolt" spells */
        if (spell >= 128 + 12 && spell < 128 + 27) return TRUE;

        /* Hand of Doom */
        if (spell == 160 + 1) return TRUE;

        /* Psycho-Spear */
        if (spell == 160 + 11) return TRUE;

        /* Doesn't hurt */
        return FALSE;
}


/*!
 * @brief ID値が退避目的に適したモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell is good for escaping.
 * @param spell 判定対象のID
 * @return 適した魔法のIDならばTRUEを返す。
 */
static bool spell_escape(byte spell)
{
        /* Blink or Teleport */
        if (spell == 160 + 4 || spell == 160 + 5) return TRUE;

        /* Teleport the player away */
        if (spell == 160 + 9 || spell == 160 + 10) return TRUE;

        /* Isn't good for escaping */
        return FALSE;
}


/*!
 * @brief ID値が妨害目的に適したモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell is good for annoying the player.
 * @param spell 判定対象のID
 * @return 適した魔法のIDならばTRUEを返す。
 */
static bool spell_annoy(byte spell)
{
        /* Shriek */
        if (spell == 96 + 0) return TRUE;

        /* Brain smash, et al (added curses) */
        if (spell >= 128 + 9 && spell <= 128 + 14) return TRUE;

        /* Scare, confuse, blind, slow, paralyze */
        if (spell >= 128 + 27 && spell <= 128 + 31) return TRUE;

        /* Teleport to */
        if (spell == 160 + 8) return TRUE;

        /* Teleport level */
        if (spell == 160 + 10) return TRUE;

        /* Darkness, make traps, cause amnesia */
        if (spell >= 160 + 12 && spell <= 160 + 14) return TRUE;

        /* Doesn't annoy */
        return FALSE;
}


/*!
 * @brief ID値が召喚型のモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell is good for annoying the player.
 * @param spell 判定対象のID
 * @return 召喚型魔法のIDならばTRUEを返す。
 */
static bool spell_summon(byte spell)
{
        /* All summon spells */
        if (spell >= 160 + 16) return TRUE;

        /* Doesn't summon */
        return FALSE;
}


/*!
 * @brief ID値が死者復活処理かどうかを返す /
 * Return TRUE if a spell is good for annoying the player.
 * @param spell 判定対象のID
 * @return 死者復活の処理ならばTRUEを返す。
 */
static bool spell_raise(byte spell)
{
        /* All raise-dead spells */
        if (spell == 160 + 15) return TRUE;

        /* Doesn't summon */
        return FALSE;
}


/*!
 * @brief ID値が戦術的なモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell is good in a tactical situation.
 * @param spell 判定対象のID
 * @return 戦術的な魔法のIDならばTRUEを返す。
 */
static bool spell_tactic(byte spell)
{
        /* Blink */
        if (spell == 160 + 4) return TRUE;

        /* Not good */
        return FALSE;
}


/*!
 * @brief ID値が無敵化するモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell makes invulnerable.
 * @param spell 判定対象のID
 * @return 召喚型魔法のIDならばTRUEを返す。
 */
static bool spell_invulner(byte spell)
{
        /* Invulnerability */
        if (spell == 160 + 3) return TRUE;

        /* No invulnerability */
        return FALSE;
}


/*!
 * @brief ID値が加速するモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell hastes.
 * @param spell 判定対象のID
 * @return 召喚型魔法のIDならばTRUEを返す。
 */
static bool spell_haste(byte spell)
{
        /* Haste self */
        if (spell == 160 + 0) return TRUE;

        /* Not a haste spell */
        return FALSE;
}


/*!
 * @brief ID値が時間停止を行うモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell world.
 * @param spell 判定対象のID
 * @return 時間停止魔法のIDならばTRUEを返す。
 */
static bool spell_world(byte spell)
{
        if (spell == 160 + 6) return TRUE;
        return FALSE;
}


/*!
 * @brief ID値が特別効果のモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell special.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param spell 判定対象のID
 * @return 特別効果魔法のIDならばTRUEを返す。
 */
static bool spell_special(player_type *target_ptr, byte spell)
{
        if (target_ptr->phase_out) return FALSE;
        if (spell == 160 + 7) return TRUE;
        return FALSE;
}


/*!
 * @brief ID値が光の剣のモンスター魔法IDかどうかを返す /
 * Return TRUE if a spell psycho-spear.
 * @param spell 判定対象のID
 * @return 光の剣のIDならばTRUEを返す。
 */
static bool spell_psy_spe(byte spell)
{
        /* world */
        if (spell == 160 + 11) return TRUE;

        /* Not a haste spell */
        return FALSE;
}


/*!
 * @brief ID値が治癒魔法かどうかを返す /
 * Return TRUE if a spell is good for healing.
 * @param spell 判定対象のID
 * @return 治癒魔法のIDならばTRUEを返す。
 */
static bool spell_heal(byte spell)
{
        /* Heal */
        if (spell == 160 + 2) return TRUE;

        /* No healing */
        return FALSE;
}


/*!
 * @brief ID値が魔力消去かどうかを返す /
 * Return TRUE if a spell is good for dispel.
 * @param spell 判定対象のID
 * @return 魔力消去のIDならばTRUEを返す。
 */
static bool spell_dispel(byte spell)
{
        /* Dispel */
        if (spell == 96 + 2) return TRUE;

        /* No dispel */
        return FALSE;
}


/*!
 * @brief モンスターがプレイヤーに魔力消去を与えるべきかを判定するルーチン
 * Check should monster cast dispel spell.
 * @param m_idx モンスターの構造体配列ID
 * @return 魔力消去をかけるべきならTRUEを返す。
 */
bool dispel_check(player_type *creature_ptr, MONSTER_IDX m_idx)
{
        /* Invulnabilty (including the song) */
        if (IS_INVULN(creature_ptr)) return TRUE;

        /* Wraith form */
        if (creature_ptr->wraith_form) return TRUE;

        /* Shield */
        if (creature_ptr->shield) return TRUE;

        /* Magic defence */
        if (creature_ptr->magicdef) return TRUE;

        /* Multi Shadow */
        if (creature_ptr->multishadow) return TRUE;

        /* Robe of dust */
        if (creature_ptr->dustrobe) return TRUE;

        /* Berserk Strength */
        if (creature_ptr->shero && (creature_ptr->pclass != CLASS_BERSERKER)) return TRUE;

        /* Demon Lord */
        if (creature_ptr->mimic_form == MIMIC_DEMON_LORD) return TRUE;

        /* Elemental resistances */
        monster_type *m_ptr = &creature_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (r_ptr->flags4 & RF4_BR_ACID)
        {
                if (!creature_ptr->immune_acid && (creature_ptr->oppose_acid || music_singing(creature_ptr, MUSIC_RESIST))) return TRUE;
                if (creature_ptr->special_defense & DEFENSE_ACID) return TRUE;
        }

        if (r_ptr->flags4 & RF4_BR_FIRE)
        {
                if (!((creature_ptr->prace == RACE_BALROG) && creature_ptr->lev > 44))
                {
                        if (!creature_ptr->immune_fire && (creature_ptr->oppose_fire || music_singing(creature_ptr, MUSIC_RESIST))) return TRUE;
                        if (creature_ptr->special_defense & DEFENSE_FIRE) return TRUE;
                }
        }

        if (r_ptr->flags4 & RF4_BR_ELEC)
        {
                if (!creature_ptr->immune_elec && (creature_ptr->oppose_elec || music_singing(creature_ptr, MUSIC_RESIST))) return TRUE;
                if (creature_ptr->special_defense & DEFENSE_ELEC) return TRUE;
        }

        if (r_ptr->flags4 & RF4_BR_COLD)
        {
                if (!creature_ptr->immune_cold && (creature_ptr->oppose_cold || music_singing(creature_ptr, MUSIC_RESIST))) return TRUE;
                if (creature_ptr->special_defense & DEFENSE_COLD) return TRUE;
        }

        if (r_ptr->flags4 & (RF4_BR_POIS | RF4_BR_NUKE))
        {
                if (!((creature_ptr->pclass == CLASS_NINJA) && creature_ptr->lev > 44))
                {
                        if (creature_ptr->oppose_pois || music_singing(creature_ptr, MUSIC_RESIST)) return TRUE;
                        if (creature_ptr->special_defense & DEFENSE_POIS) return TRUE;
                }
        }

        /* Ultimate resistance */
        if (creature_ptr->ult_res) return TRUE;

        /* Potion of Neo Tsuyosi special */
        if (creature_ptr->tsuyoshi) return TRUE;

        /* Elemental Brands */
        if ((creature_ptr->special_attack & ATTACK_ACID) && !(r_ptr->flagsr & RFR_EFF_IM_ACID_MASK)) return TRUE;
        if ((creature_ptr->special_attack & ATTACK_FIRE) && !(r_ptr->flagsr & RFR_EFF_IM_FIRE_MASK)) return TRUE;
        if ((creature_ptr->special_attack & ATTACK_ELEC) && !(r_ptr->flagsr & RFR_EFF_IM_ELEC_MASK)) return TRUE;
        if ((creature_ptr->special_attack & ATTACK_COLD) && !(r_ptr->flagsr & RFR_EFF_IM_COLD_MASK)) return TRUE;
        if ((creature_ptr->special_attack & ATTACK_POIS) && !(r_ptr->flagsr & RFR_EFF_IM_POIS_MASK)) return TRUE;

        if (creature_ptr->pspeed < 145)
        {
                if (IS_FAST(creature_ptr)) return TRUE;
        }

        /* Light speed */
        if (creature_ptr->lightspeed && (m_ptr->mspeed < 136)) return TRUE;

        if (creature_ptr->riding && (creature_ptr->current_floor_ptr->m_list[creature_ptr->riding].mspeed < 135))
        {
                if (monster_fast_remaining(&creature_ptr->current_floor_ptr->m_list[creature_ptr->riding])) return TRUE;
        }

        /* No need to cast dispel spell */
        return FALSE;
}


/*!
 * todo 長過ぎる。切り分けが必要
 * @brief モンスターの魔法選択ルーチン
 * Have a monster choose a spell from a list of "useful" spells.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスターの構造体配列ID
 * @param spells 候補魔法IDをまとめた配列
 * @param num spellsの長さ
 * @return 選択したモンスター魔法のID
 * @details
 * Note that this list does NOT include spells that will just hit\n
 * other monsters, and the list is restricted when the monster is\n
 * "desperate".  Should that be the job of this function instead?\n
 *\n
 * Stupid monsters will just pick a spell randomly.  Smart monsters\n
 * will choose more "intelligently".\n
 *\n
 * Use the helper functions above to put spells into categories.\n
 *\n
 * This function may well be an efficiency bottleneck.\n
 */
static int choose_attack_spell(player_type *target_ptr, MONSTER_IDX m_idx, byte spells[], byte num)
{
        byte escape[96], escape_num = 0;
        byte attack[96], attack_num = 0;
        byte summon[96], summon_num = 0;
        byte tactic[96], tactic_num = 0;
        byte annoy[96], annoy_num = 0;
        byte invul[96], invul_num = 0;
        byte haste[96], haste_num = 0;
        byte world[96], world_num = 0;
        byte special[96], special_num = 0;
        byte psy_spe[96], psy_spe_num = 0;
        byte raise[96], raise_num = 0;
        byte heal[96], heal_num = 0;
        byte dispel[96], dispel_num = 0;

        /* Stupid monsters choose randomly */
        monster_type *m_ptr = &target_ptr->current_floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];
        if (r_ptr->flags2 & (RF2_STUPID)) return (spells[randint0(num)]);

        /* Categorize spells */
        for (int i = 0; i < num; i++)
        {
                /* Escape spell? */
                if (spell_escape(spells[i])) escape[escape_num++] = spells[i];

                /* Attack spell? */
                if (spell_attack(spells[i])) attack[attack_num++] = spells[i];

                /* Summon spell? */
                if (spell_summon(spells[i])) summon[summon_num++] = spells[i];

                /* Tactical spell? */
                if (spell_tactic(spells[i])) tactic[tactic_num++] = spells[i];

                /* Annoyance spell? */
                if (spell_annoy(spells[i])) annoy[annoy_num++] = spells[i];

                /* Invulnerability spell? */
                if (spell_invulner(spells[i])) invul[invul_num++] = spells[i];

                /* Haste spell? */
                if (spell_haste(spells[i])) haste[haste_num++] = spells[i];

                /* World spell? */
                if (spell_world(spells[i])) world[world_num++] = spells[i];

                /* Special spell? */
                if (spell_special(target_ptr, spells[i])) special[special_num++] = spells[i];

                /* Psycho-spear spell? */
                if (spell_psy_spe(spells[i])) psy_spe[psy_spe_num++] = spells[i];

                /* Raise-dead spell? */
                if (spell_raise(spells[i])) raise[raise_num++] = spells[i];

                /* Heal spell? */
                if (spell_heal(spells[i])) heal[heal_num++] = spells[i];

                /* Dispel spell? */
                if (spell_dispel(spells[i])) dispel[dispel_num++] = spells[i];
        }

        /*** Try to pick an appropriate spell type ***/

        /* world */
        if (world_num && (randint0(100) < 15) && !current_world_ptr->timewalk_m_idx)
        {
                /* Choose haste spell */
                return (world[randint0(world_num)]);
        }

        /* special */
        if (special_num)
        {
                bool success = FALSE;
                switch (m_ptr->r_idx)
                {
                case MON_BANOR:
                case MON_LUPART:
                        if ((m_ptr->hp < m_ptr->maxhp / 2) && r_info[MON_BANOR].max_num && r_info[MON_LUPART].max_num) success = TRUE;
                        break;
                default: break;
                }

                if (success) return (special[randint0(special_num)]);
        }

        /* Still hurt badly, couldn't flee, attempt to heal */
        if (m_ptr->hp < m_ptr->maxhp / 3 && one_in_(2))
        {
                /* Choose heal spell if possible */
                if (heal_num) return (heal[randint0(heal_num)]);
        }

        /* Hurt badly or afraid, attempt to flee */
        if (((m_ptr->hp < m_ptr->maxhp / 3) || monster_fear_remaining(m_ptr)) && one_in_(2))
        {
                /* Choose escape spell if possible */
                if (escape_num) return (escape[randint0(escape_num)]);
        }

        /* special */
        if (special_num)
        {
                bool success = FALSE;
                switch (m_ptr->r_idx)
                {
                case MON_OHMU:
                case MON_BANOR:
                case MON_LUPART:
                        break;
                case MON_BANORLUPART:
                        if (randint0(100) < 70) success = TRUE;
                        break;
                case MON_ROLENTO:
                        if (randint0(100) < 40) success = TRUE;
                        break;
                default:
                        if (randint0(100) < 50) success = TRUE;
                        break;
                }
                if (success) return (special[randint0(special_num)]);
        }

        /* Player is close and we have attack spells, blink away */
        if ((distance(target_ptr->y, target_ptr->x, m_ptr->fy, m_ptr->fx) < 4) && (attack_num || (r_ptr->a_ability_flags2 & RF6_TRAPS)) && (randint0(100) < 75) && !current_world_ptr->timewalk_m_idx)
        {
                /* Choose tactical spell */
                if (tactic_num) return (tactic[randint0(tactic_num)]);
        }

        /* Summon if possible (sometimes) */
        if (summon_num && (randint0(100) < 40))
        {
                /* Choose summon spell */
                return (summon[randint0(summon_num)]);
        }

        /* dispel */
        if (dispel_num && one_in_(2))
        {
                /* Choose dispel spell if possible */
                if (dispel_check(target_ptr, m_idx))
                {
                        return (dispel[randint0(dispel_num)]);
                }
        }

        /* Raise-dead if possible (sometimes) */
        if (raise_num && (randint0(100) < 40))
        {
                /* Choose raise-dead spell */
                return (raise[randint0(raise_num)]);
        }

        /* Attack spell (most of the time) */
        if (IS_INVULN(target_ptr))
        {
                if (psy_spe_num && (randint0(100) < 50))
                {
                        /* Choose attack spell */
                        return (psy_spe[randint0(psy_spe_num)]);
                }
                else if (attack_num && (randint0(100) < 40))
                {
                        /* Choose attack spell */
                        return (attack[randint0(attack_num)]);
                }
        }
        else if (attack_num && (randint0(100) < 85))
        {
                /* Choose attack spell */
                return (attack[randint0(attack_num)]);
        }

        /* Try another tactical spell (sometimes) */
        if (tactic_num && (randint0(100) < 50) && !current_world_ptr->timewalk_m_idx)
        {
                /* Choose tactic spell */
                return (tactic[randint0(tactic_num)]);
        }

        /* Cast globe of invulnerability if not already in effect */
        if (invul_num && !m_ptr->mtimed[MTIMED_INVULNER] && (randint0(100) < 50))
        {
                /* Choose Globe of Invulnerability */
                return (invul[randint0(invul_num)]);
        }

        /* We're hurt (not badly), try to heal */
        if ((m_ptr->hp < m_ptr->maxhp * 3 / 4) && (randint0(100) < 25))
        {
                /* Choose heal spell if possible */
                if (heal_num) return (heal[randint0(heal_num)]);
        }

        /* Haste self if we aren't already somewhat hasted (rarely) */
        if (haste_num && (randint0(100) < 20) && !monster_fast_remaining(m_ptr))
        {
                /* Choose haste spell */
                return (haste[randint0(haste_num)]);
        }

        /* Annoy player (most of the time) */
        if (annoy_num && (randint0(100) < 80))
        {
                /* Choose annoyance spell */
                return (annoy[randint0(annoy_num)]);
        }

        /* Choose no spell */
        return 0;
}


/*!
 * @brief ID値が非魔術的な特殊技能かどうかを返す /
 * Return TRUE if a spell is inate spell.
 * @param spell 判定対象のID
 * @return 非魔術的な特殊技能ならばTRUEを返す。
 */
bool spell_is_inate(SPELL_IDX spell)
{
        if (spell < 32 * 4) /* Set RF4 */
        {
                if ((1L << (spell - 32 * 3)) & RF4_NOMAGIC_MASK) return TRUE;
        }

        if (spell < 32 * 5) /* Set RF5 */
        {
                if ((1L << (spell - 32 * 4)) & RF5_NOMAGIC_MASK) return TRUE;
        }

        if (spell < 32 * 6) /* Set RF6 */
        {
                if ((1L << (spell - 32 * 5)) & RF6_NOMAGIC_MASK) return TRUE;
        }

        /* This spell is not "inate" */
        return FALSE;
}


/*!
 * @brief モンスターがプレイヤーにダメージを与えるための最適な座標を算出する /
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_ptr 技能を使用するモンスター構造体の参照ポインタ
 * @param yp 最適な目標地点のY座標を返す参照ポインタ
 * @param xp 最適な目標地点のX座標を返す参照ポインタ
 * @param f_flag 射線に入れるのを避ける地形の所持フラグ
 * @param path_check 射線を判定するための関数ポインタ
 * @return 有効な座標があった場合TRUEを返す
 */
static bool adjacent_grid_check(player_type *target_ptr, monster_type *m_ptr, POSITION *yp, POSITION *xp,
        int f_flag, bool(*path_check)(player_type *, POSITION, POSITION, POSITION, POSITION))
{
        static int tonari_y[4][8] = { {-1, -1, -1,  0,  0,  1,  1,  1},
                                                                 {-1, -1, -1,  0,  0,  1,  1,  1},
                                                                 { 1,  1,  1,  0,  0, -1, -1, -1},
                                                                 { 1,  1,  1,  0,  0, -1, -1, -1} };
        static int tonari_x[4][8] = { {-1,  0,  1, -1,  1, -1,  0,  1},
                                                                 { 1,  0, -1,  1, -1,  1,  0, -1},
                                                                 {-1,  0,  1, -1,  1, -1,  0,  1},
                                                                 { 1,  0, -1,  1, -1,  1,  0, -1} };

        int next;
        if (m_ptr->fy < target_ptr->y && m_ptr->fx < target_ptr->x) next = 0;
        else if (m_ptr->fy < target_ptr->y) next = 1;
        else if (m_ptr->fx < target_ptr->x) next = 2;
        else next = 3;

        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        for (int i = 0; i < 8; i++)
        {
                int next_x = *xp + tonari_x[next][i];
                int next_y = *yp + tonari_y[next][i];
                grid_type *g_ptr;

                /* Access the next grid */
                g_ptr = &floor_ptr->grid_array[next_y][next_x];

                /* Skip this feature */
                if (!cave_have_flag_grid(g_ptr, f_flag)) continue;

                if (path_check(target_ptr, m_ptr->fy, m_ptr->fx, next_y, next_x))
                {
                        *yp = next_y;
                        *xp = next_x;
                        return TRUE;
                }
        }

        return FALSE;
}


/*!
 * todo メインルーチンの割に長過ぎる。要分割
 * @brief モンスターの特殊技能メインルーチン /
 * Creatures can cast spells, shoot missiles, and breathe.
 * @param target_ptr プレーヤーへの参照ポインタ
 * @param m_idx モンスター構造体配列のID
 * @return 実際に特殊技能を利用したらTRUEを返す
 * @details
 * Returns "TRUE" if a spell (or whatever) was (successfully) cast.\n
 *\n
 * This function could use some work, but remember to\n
 * keep it as optimized as possible, while retaining generic code.\n
 *\n
 * Verify the various "blind-ness" checks in the code.\n
 *\n
 * Note that several effects should really not be "seen"\n
 * if the player is blind.  See also "effects.c" for other "mistakes".\n
 *\n
 * Perhaps monsters should breathe at locations *near* the player,\n
 * since this would allow them to inflict "partial" damage.\n
 *\n
 * Perhaps smart monsters should decline to use "bolt" spells if\n
 * there is a monster in the way, unless they wish to kill it.\n
 *\n
 * Note that, to allow the use of the "track_target" option at some\n
 * later time, certain non-optimal things are done in the code below,\n
 * including explicit checks against the "direct" variable, which is\n
 * currently always true by the time it is checked, but which should\n
 * really be set according to an explicit "projectable()" test, and\n
 * the use of generic "x,y" locations instead of the player location,\n
 * with those values being initialized with the player location.\n
 *\n
 * It will not be possible to "correctly" handle the case in which a\n
 * monster attempts to attack a location which is thought to contain\n
 * the player, but which in fact is nowhere near the player, since this\n
 * might induce all sorts of messages about the attack itself, and about\n
 * the effects of the attack, which the player might or might not be in\n
 * a position to observe.  Thus, for simplicity, it is probably best to\n
 * only allow "faulty" attacks by a monster if one of the important grids\n
 * (probably the initial or final grid) is in fact in view of the player.\n
 * It may be necessary to actually prevent spell attacks except when the\n
 * monster actually has line of sight to the player.  Note that a monster\n
 * could be left in a bizarre situation after the player ducked behind a\n
 * pillar and then teleported away, for example.\n
 *\n
 * @note
 * that certain spell attacks do not use the "project()" function\n
 * but "simulate" it via the "direct" variable, which is always at least\n
 * as restrictive as the "project()" function.  This is necessary to\n
 * prevent "blindness" attacks and such from bending around walls, etc,\n
 * and to allow the use of the "track_target" option in the future.\n
 *\n
 * Note that this function attempts to optimize the use of spells for the\n
 * cases in which the monster has no spells, or has spells but cannot use\n
 * them, or has spells but they will have no "useful" effect.  Note that\n
 * this function has been an efficiency bottleneck in the past.\n
 *\n
 * Note the special "MFLAG_NICE" flag, which prevents a monster from using\n
 * any spell attacks until the player has had a single chance to move.\n
 */
bool make_attack_spell(MONSTER_IDX m_idx, player_type *target_ptr)
{
#ifdef JP
#else

        char m_poss[80];
#endif
        /* Extract the "see-able-ness" */
        floor_type *floor_ptr = target_ptr->current_floor_ptr;
        monster_type *m_ptr = &floor_ptr->m_list[m_idx];
        monster_race *r_ptr = &r_info[m_ptr->r_idx];

        /* Cannot cast spells when confused */
        if (monster_confused_remaining(m_ptr))
        {
                reset_target(m_ptr);
                return FALSE;
        }

        /* Cannot cast spells when nice */
        if (m_ptr->mflag & MFLAG_NICE) return FALSE;
        if (!is_hostile(m_ptr)) return FALSE;


        /* Sometimes forbid inate attacks (breaths) */
        bool no_inate = FALSE;
        if (randint0(100) >= (r_ptr->freq_spell * 2)) no_inate = TRUE;

        /* Extract the racial spell flags */
        BIT_FLAGS f4 = r_ptr->flags4;
        BIT_FLAGS f5 = r_ptr->a_ability_flags1;
        BIT_FLAGS f6 = r_ptr->a_ability_flags2;

        /*** require projectable player ***/

        /* Check range */
        if ((m_ptr->cdis > MAX_RANGE) && !m_ptr->target_y) return FALSE;

        /* Check path for lite breath */
        POSITION x = target_ptr->x;
        POSITION y = target_ptr->y;
        POSITION x_br_lite = 0;
        POSITION y_br_lite = 0;
        if (f4 & RF4_BR_LITE)
        {
                y_br_lite = y;
                x_br_lite = x;

                if (los(target_ptr, m_ptr->fy, m_ptr->fx, y_br_lite, x_br_lite))
                {
                        feature_type *f_ptr = &f_info[floor_ptr->grid_array[y_br_lite][x_br_lite].feat];

                        if (!have_flag(f_ptr->flags, FF_LOS))
                        {
                                if (have_flag(f_ptr->flags, FF_PROJECT) && one_in_(2)) f4 &= ~(RF4_BR_LITE);
                        }
                }

                /* Check path to next grid */
                else if (!adjacent_grid_check(target_ptr, m_ptr, &y_br_lite, &x_br_lite, FF_LOS, los)) f4 &= ~(RF4_BR_LITE);

                /* Don't breath lite to the wall if impossible */
                if (!(f4 & RF4_BR_LITE))
                {
                        y_br_lite = 0;
                        x_br_lite = 0;
                }
        }

        /* Check path */
        bool do_spell = DO_SPELL_NONE;
        if (projectable(target_ptr, m_ptr->fy, m_ptr->fx, y, x))
        {
                feature_type *f_ptr = &f_info[floor_ptr->grid_array[y][x].feat];

                if (!have_flag(f_ptr->flags, FF_PROJECT))
                {
                        /* Breath disintegration to the wall if possible */
                        if ((f4 & RF4_BR_DISI) && have_flag(f_ptr->flags, FF_HURT_DISI) && one_in_(2)) do_spell = DO_SPELL_BR_DISI;

                        /* Breath lite to the transparent wall if possible */
                        else if ((f4 & RF4_BR_LITE) && have_flag(f_ptr->flags, FF_LOS) && one_in_(2)) do_spell = DO_SPELL_BR_LITE;
                }
        }

        /* Check path to next grid */
        else
        {
                bool success = FALSE;

                if ((f4 & RF4_BR_DISI) && (m_ptr->cdis < MAX_RANGE / 2) &&
                        in_disintegration_range(floor_ptr, m_ptr->fy, m_ptr->fx, y, x) &&
                        (one_in_(10) || (projectable(target_ptr, y, x, m_ptr->fy, m_ptr->fx) && one_in_(2))))
                {
                        do_spell = DO_SPELL_BR_DISI;
                        success = TRUE;
                }
                else if ((f4 & RF4_BR_LITE) && (m_ptr->cdis < MAX_RANGE / 2) &&
                        los(target_ptr, m_ptr->fy, m_ptr->fx, y, x) && one_in_(5))
                {
                        do_spell = DO_SPELL_BR_LITE;
                        success = TRUE;
                }
                else if ((f5 & RF5_BA_LITE) && (m_ptr->cdis <= MAX_RANGE))
                {
                        POSITION by = y, bx = x;
                        get_project_point(target_ptr, m_ptr->fy, m_ptr->fx, &by, &bx, 0L);
                        if ((distance(by, bx, y, x) <= 3) && los(target_ptr, by, bx, y, x) && one_in_(5))
                        {
                                do_spell = DO_SPELL_BA_LITE;
                                success = TRUE;
                        }
                }

                if (!success) success = adjacent_grid_check(target_ptr, m_ptr, &y, &x, FF_PROJECT, projectable);

                if (!success)
                {
                        if (m_ptr->target_y && m_ptr->target_x)
                        {
                                y = m_ptr->target_y;
                                x = m_ptr->target_x;
                                f4 &= (RF4_INDIRECT_MASK);
                                f5 &= (RF5_INDIRECT_MASK);
                                f6 &= (RF6_INDIRECT_MASK);
                                success = TRUE;
                        }

                        if (y_br_lite && x_br_lite && (m_ptr->cdis < MAX_RANGE / 2) && one_in_(5))
                        {
                                if (!success)
                                {
                                        y = y_br_lite;
                                        x = x_br_lite;
                                        do_spell = DO_SPELL_BR_LITE;
                                        success = TRUE;
                                }
                                else f4 |= (RF4_BR_LITE);
                        }
                }

                /* No spells */
                if (!success) return FALSE;
        }

        reset_target(m_ptr);

        DEPTH rlev = ((r_ptr->level >= 1) ? r_ptr->level : 1);

        /* Forbid inate attacks sometimes */
        if (no_inate)
        {
                f4 &= ~(RF4_NOMAGIC_MASK);
                f5 &= ~(RF5_NOMAGIC_MASK);
                f6 &= ~(RF6_NOMAGIC_MASK);
        }

        bool can_use_lite_area = FALSE;
        if (f6 & RF6_DARKNESS)
        {
                if ((target_ptr->pclass == CLASS_NINJA) &&
                        !(r_ptr->flags3 & (RF3_UNDEAD | RF3_HURT_LITE)) &&
                        !(r_ptr->flags7 & RF7_DARK_MASK))
                        can_use_lite_area = TRUE;

                if (!(r_ptr->flags2 & RF2_STUPID))
                {
                        if (d_info[target_ptr->dungeon_idx].flags1 & DF1_DARKNESS) f6 &= ~(RF6_DARKNESS);
                        else if ((target_ptr->pclass == CLASS_NINJA) && !can_use_lite_area) f6 &= ~(RF6_DARKNESS);
                }
        }

        bool in_no_magic_dungeon = (d_info[target_ptr->dungeon_idx].flags1 & DF1_NO_MAGIC) && floor_ptr->dun_level
                && (!floor_ptr->inside_quest || is_fixed_quest_idx(floor_ptr->inside_quest));
        if (in_no_magic_dungeon && !(r_ptr->flags2 & RF2_STUPID))
        {
                f4 &= (RF4_NOMAGIC_MASK);
                f5 &= (RF5_NOMAGIC_MASK);
                f6 &= (RF6_NOMAGIC_MASK);
        }

        if (r_ptr->flags2 & RF2_SMART)
        {
                /* Hack -- allow "desperate" spells */
                if ((m_ptr->hp < m_ptr->maxhp / 10) &&
                        (randint0(100) < 50))
                {
                        /* Require intelligent spells */
                        f4 &= (RF4_INT_MASK);
                        f5 &= (RF5_INT_MASK);
                        f6 &= (RF6_INT_MASK);
                }

                /* Hack -- decline "teleport level" in some case */
                if ((f6 & RF6_TELE_LEVEL) && is_teleport_level_ineffective(target_ptr, 0))
                {
                        f6 &= ~(RF6_TELE_LEVEL);
                }
        }

        /* No spells left */
        if (!f4 && !f5 && !f6) return FALSE;

        /* Remove the "ineffective" spells */
        remove_bad_spells(m_idx, target_ptr, &f4, &f5, &f6);

        if (floor_ptr->inside_arena || target_ptr->phase_out)
        {
                f4 &= ~(RF4_SUMMON_MASK);
                f5 &= ~(RF5_SUMMON_MASK);
                f6 &= ~(RF6_SUMMON_MASK | RF6_TELE_LEVEL);

                if (m_ptr->r_idx == MON_ROLENTO) f6 &= ~(RF6_SPECIAL);
        }

        /* No spells left */
        if (!f4 && !f5 && !f6) return FALSE;

        if (!(r_ptr->flags2 & RF2_STUPID))
        {
                if (!target_ptr->csp) f5 &= ~(RF5_DRAIN_MANA);

                /* Check for a clean bolt shot */
                if (((f4 & RF4_BOLT_MASK) ||
                        (f5 & RF5_BOLT_MASK) ||
                        (f6 & RF6_BOLT_MASK)) &&
                        !clean_shot(target_ptr, m_ptr->fy, m_ptr->fx, target_ptr->y, target_ptr->x, FALSE))
                {
                        /* Remove spells that will only hurt friends */
                        f4 &= ~(RF4_BOLT_MASK);
                        f5 &= ~(RF5_BOLT_MASK);
                        f6 &= ~(RF6_BOLT_MASK);
                }

                /* Check for a possible summon */
                if (((f4 & RF4_SUMMON_MASK) ||
                        (f5 & RF5_SUMMON_MASK) ||
                        (f6 & RF6_SUMMON_MASK)) &&
                        !(summon_possible(target_ptr, y, x)))
                {
                        /* Remove summoning spells */
                        f4 &= ~(RF4_SUMMON_MASK);
                        f5 &= ~(RF5_SUMMON_MASK);
                        f6 &= ~(RF6_SUMMON_MASK);
                }

                /* Check for a possible raise dead */
                if ((f6 & RF6_RAISE_DEAD) && !raise_possible(target_ptr, m_ptr))
                {
                        /* Remove raise dead spell */
                        f6 &= ~(RF6_RAISE_DEAD);
                }

                /* Special moves restriction */
                if (f6 & RF6_SPECIAL)
                {
                        if ((m_ptr->r_idx == MON_ROLENTO) && !summon_possible(target_ptr, y, x))
                        {
                                f6 &= ~(RF6_SPECIAL);
                        }
                }

                /* No spells left */
                if (!f4 && !f5 && !f6) return FALSE;
        }

        /* Extract the "inate" spells */
        byte spell[96], num = 0;
        for (int k = 0; k < 32; k++)
        {
                if (f4 & (1L << k)) spell[num++] = k + RF4_SPELL_START;
        }

        /* Extract the "normal" spells */
        for (int k = 0; k < 32; k++)
        {
                if (f5 & (1L << k)) spell[num++] = k + RF5_SPELL_START;
        }

        /* Extract the "bizarre" spells */
        for (int k = 0; k < 32; k++)
        {
                if (f6 & (1L << k)) spell[num++] = k + RF6_SPELL_START;
        }

        /* No spells left */
        if (!num) return FALSE;

        /* Stop if player is dead or gone */
        if (!target_ptr->playing || target_ptr->is_dead) return FALSE;

        /* Stop if player is leaving */
        if (target_ptr->leaving) return FALSE;

        /* Get the monster name (or "it") */
        GAME_TEXT m_name[MAX_NLEN];
        monster_desc(target_ptr, m_name, m_ptr, 0x00);

#ifdef JP
#else
        /* Get the monster possessive ("his"/"her"/"its") */
        monster_desc(target_ptr, m_poss, m_ptr, MD_PRON_VISIBLE | MD_POSSESSIVE);
#endif

        SPELL_IDX thrown_spell = 0;
        switch (do_spell)
        {
        case DO_SPELL_NONE:
        {
                int attempt = 10;
                while (attempt--)
                {
                        thrown_spell = choose_attack_spell(target_ptr, m_idx, spell, num);
                        if (thrown_spell) break;
                }
        }

        break;

        case DO_SPELL_BR_LITE:
                thrown_spell = 96 + 14; /* RF4_BR_LITE */
                break;

        case DO_SPELL_BR_DISI:
                thrown_spell = 96 + 31; /* RF4_BR_DISI */
                break;

        case DO_SPELL_BA_LITE:
                thrown_spell = 128 + 20; /* RF5_BA_LITE */
                break;

        default:
                return FALSE;
        }

        /* Abort if no spell was chosen */
        if (!thrown_spell) return FALSE;

        /* Calculate spell failure rate */
        PERCENTAGE failrate = 25 - (rlev + 3) / 4;

        /* Hack -- Stupid monsters will never fail (for jellies and such) */
        if (r_ptr->flags2 & RF2_STUPID) failrate = 0;

        /* Check for spell failure (inate attacks never fail) */
        if (!spell_is_inate(thrown_spell)
                && (in_no_magic_dungeon || (monster_stunned_remaining(m_ptr) && one_in_(2)) || (randint0(100) < failrate)))
        {
                disturb(target_ptr, TRUE, TRUE);
                msg_format(_("%^sは呪文を唱えようとしたが失敗した。", "%^s tries to cast a spell, but fails."), m_name);

                return TRUE;
        }

        /* Hex: Anti Magic Barrier */
        if (!spell_is_inate(thrown_spell) && magic_barrier(target_ptr, m_idx))
        {
                msg_format(_("反魔法バリアが%^sの呪文をかき消した。", "Anti magic barrier cancels the spell which %^s casts."), m_name);
                return TRUE;
        }

        /* Projectable? */
        bool direct = player_bold(target_ptr, y, x);
        bool can_remember = is_original_ap_and_seen(target_ptr, m_ptr);
        if (!direct)
        {
                switch (thrown_spell)
                {
                case 96 + 2:    /* RF4_DISPEL */
                case 96 + 4:    /* RF4_SHOOT */
                case 128 + 9:   /* RF5_DRAIN_MANA */
                case 128 + 10:  /* RF5_MIND_BLAST */
                case 128 + 11:  /* RF5_BRAIN_SMASH */
                case 128 + 12:  /* RF5_CAUSE_1 */
                case 128 + 13:  /* RF5_CAUSE_2 */
                case 128 + 14:  /* RF5_CAUSE_3 */
                case 128 + 15:  /* RF5_CAUSE_4 */
                case 128 + 16:  /* RF5_BO_ACID */
                case 128 + 17:  /* RF5_BO_ELEC */
                case 128 + 18:  /* RF5_BO_FIRE */
                case 128 + 19:  /* RF5_BO_COLD */
                case 128 + 21:  /* RF5_BO_NETH */
                case 128 + 22:  /* RF5_BO_WATE */
                case 128 + 23:  /* RF5_BO_MANA */
                case 128 + 24:  /* RF5_BO_PLAS */
                case 128 + 25:  /* RF5_BO_ICEE */
                case 128 + 26:  /* RF5_MISSILE */
                case 128 + 27:  /* RF5_SCARE */
                case 128 + 28:  /* RF5_BLIND */
                case 128 + 29:  /* RF5_CONF */
                case 128 + 30:  /* RF5_SLOW */
                case 128 + 31:  /* RF5_HOLD */
                case 160 + 1:   /* RF6_HAND_DOOM */
                case 160 + 8:   /* RF6_TELE_TO */
                case 160 + 9:   /* RF6_TELE_AWAY */
                case 160 + 10:  /* RF6_TELE_LEVEL */
                case 160 + 11:  /* RF6_PSY_SPEAR */
                case 160 + 12:  /* RF6_DARKNESS */
                case 160 + 14:  /* RF6_FORGET */
                        return FALSE;
                }
        }

        /* Cast the spell. */
        int dam = monspell_to_player(target_ptr, thrown_spell, y, x, m_idx);
        if (dam < 0) return FALSE;

        if ((target_ptr->action == ACTION_LEARN) && thrown_spell > 175)
        {
                learn_spell(target_ptr, thrown_spell - 96);
        }

        bool seen = (!target_ptr->blind && m_ptr->ml);
        bool maneable = player_has_los_bold(target_ptr, m_ptr->fy, m_ptr->fx);
        if (seen && maneable && !current_world_ptr->timewalk_m_idx && (target_ptr->pclass == CLASS_IMITATOR))
        {
                if (thrown_spell != 167) /* Not RF6_SPECIAL */
                {
                        if (target_ptr->mane_num == MAX_MANE)
                        {
                                int i;
                                target_ptr->mane_num--;
                                for (i = 0; i < target_ptr->mane_num; i++)
                                {
                                        target_ptr->mane_spell[i] = target_ptr->mane_spell[i + 1];
                                        target_ptr->mane_dam[i] = target_ptr->mane_dam[i + 1];
                                }
                        }
                        target_ptr->mane_spell[target_ptr->mane_num] = thrown_spell - 96;
                        target_ptr->mane_dam[target_ptr->mane_num] = dam;
                        target_ptr->mane_num++;
                        target_ptr->new_mane = TRUE;

                        target_ptr->redraw |= (PR_IMITATION);
                }
        }

        /* Remember what the monster did to us */
        if (can_remember)
        {
                /* Inate spell */
                if (thrown_spell < 32 * 4)
                {
                        r_ptr->r_flags4 |= (1L << (thrown_spell - 32 * 3));
                        if (r_ptr->r_cast_spell < MAX_UCHAR) r_ptr->r_cast_spell++;
                }

                /* Bolt or Ball */
                else if (thrown_spell < 32 * 5)
                {
                        r_ptr->r_flags5 |= (1L << (thrown_spell - 32 * 4));
                        if (r_ptr->r_cast_spell < MAX_UCHAR) r_ptr->r_cast_spell++;
                }

                /* Special spell */
                else if (thrown_spell < 32 * 6)
                {
                        r_ptr->r_flags6 |= (1L << (thrown_spell - 32 * 5));
                        if (r_ptr->r_cast_spell < MAX_UCHAR) r_ptr->r_cast_spell++;
                }
        }

        /* Always take note of monsters that kill you */
        if (target_ptr->is_dead && (r_ptr->r_deaths < MAX_SHORT) && !floor_ptr->inside_arena)
        {
                r_ptr->r_deaths++; /* Ignore appearance difference */
        }

        /* A spell was cast */
        return TRUE;
}