STEP06：services層の実装（宿で全回復・教会で復活）

/* services.h */
#ifndef SERVICES_H
#define SERVICES_H

#include "common.h"

/* 施設の料金（ゲームバランスは後で調整しやすいように定数化） */
#define INN_FEE_PER_PERSON     10
#define CHURCH_FEE_PER_REVIVE  30

/* 復活時のHP（最大HPの何%で起こすか） */
#define REVIVE_HP_PERCENT  50  /* 50% */

/* 結果コード（main側がUI表示を出し分けるため） */
typedef enum {
    SERVICE_OK = 0,
    SERVICE_NOT_ENOUGH_GOLD,
    SERVICE_NOTHING_TO_REVIVE
} ServiceResult;

/* 最小のキャラ型（既にcharacters.hがあるならそれを使ってOK）
   ここはあなたの既存設計に合わせて差し替えてください。 */
typedef struct Character {
    char name[32];
    int hp, max_hp;
    int mp, max_mp;
} Character;

/* 宿：全回復（パーティ全員）＋料金徴収 */
ServiceResult service_inn(Character party[], int party_count, int *gold);

/* 教会：戦闘不能者を復活（全員）＋料金徴収
   戦闘不能(HP=0)の人数ぶん課金、復活対象がいないなら SERVICE_NOTHING_TO_REVIVE */
ServiceResult service_church(Character party[], int party_count, int *gold);

/* 便利関数（UIで人数表示などに使える） */
int service_count_dead(const Character party[], int party_count);

#endif

/* services.c */
#include "services.h"

/* 内部ヘルパ */
static int clamp_min(int v, int minv) { return (v < minv) ? minv : v; }
static int calc_revive_hp(int max_hp) {
    int hp = (max_hp * REVIVE_HP_PERCENT) / 100;
    return clamp_min(hp, 1);
}

int service_count_dead(const Character party[], int party_count) {
    int dead = 0;
    for (int i = 0; i < party_count; i++) {
        if (party[i].hp <= 0) dead++;
    }
    return dead;
}

ServiceResult service_inn(Character party[], int party_count, int *gold) {
    int fee = INN_FEE_PER_PERSON * party_count;
    if (*gold < fee) return SERVICE_NOT_ENOUGH_GOLD;

    *gold -= fee;

    for (int i = 0; i < party_count; i++) {
        party[i].hp = party[i].max_hp;
        party[i].mp = party[i].max_mp;
    }
    return SERVICE_OK;
}

ServiceResult service_church(Character party[], int party_count, int *gold) {
    int dead = service_count_dead(party, party_count);
    if (dead == 0) return SERVICE_NOTHING_TO_REVIVE;

    int fee = CHURCH_FEE_PER_REVIVE * dead;
    if (*gold < fee) return SERVICE_NOT_ENOUGH_GOLD;

    *gold -= fee;

    for (int i = 0; i < party_count; i++) {
        if (party[i].hp <= 0) {
            party[i].hp = calc_revive_hp(party[i].max_hp);
            /* MPはそのまま（好みで 0 にしてもOK） */
        }
    }
    return SERVICE_OK;
}

#include "services.h"
#include "map.h"
#include "ui.h"
/* STEP02 */
void sfx_beep(int kind);

static void on_inn(Character party[], int n, int *gold) {
    ServiceResult r = service_inn(party, n, gold);

    ui_print_header("INN");
    if (r == SERVICE_OK) {
        sfx_beep(2);
        printf("You fully recovered!  (Fee: %dG)\n\n", INN_FEE_PER_PERSON * n);
    } else {
        sfx_beep(4);
        printf("Not enough gold...  (Need: %dG)\n\n", INN_FEE_PER_PERSON * n);
    }
    ui_wait_enter("Press Enter...");
}

static void on_church(Character party[], int n, int *gold) {
    int dead = service_count_dead(party, n);
    ServiceResult r = service_church(party, n, gold);

    ui_print_header("CHURCH");
    if (r == SERVICE_OK) {
        sfx_beep(0);
        printf("Revived %d member(s)!  (Fee: %dG)\n\n", dead, CHURCH_FEE_PER_REVIVE * dead);
    } else if (r == SERVICE_NOTHING_TO_REVIVE) {
        sfx_beep(4);
        printf("No one needs revival.\n\n");
    } else {
        sfx_beep(4);
        printf("Not enough gold...  (Need: %dG)\n\n", CHURCH_FEE_PER_REVIVE * dead);
    }
    ui_wait_enter("Press Enter...");
}

char stepped = map_try_move(&m, &px, &py, dx, dy);

if (stepped == TILE_INN) {
    on_inn(party, party_count, &gold);
} else if (stepped == TILE_CHURCH) {
    on_church(party, party_count, &gold);
}

if (cmd == 9) {
    party[1].hp = 0; /* Mage を戦闘不能にする */
    ui_print_header("DEBUG");
    printf("%s is now down (HP=0).\n\n", party[1].name);
    ui_wait_enter("Press Enter...");
    continue;
}