// smallobject_v5_env_box.h - SmallObject v5 環境ゲート（Phase v5-0）
//
// ENV ベース: HAKMEM_SMALL_HEAP_V5_ENABLED, HAKMEM_SMALL_HEAP_V5_CLASSES

#ifndef HAKMEM_SMALLOBJECT_V5_ENV_BOX_H
#define HAKMEM_SMALLOBJECT_V5_ENV_BOX_H

#include <stdlib.h>
#include <string.h>

// small_heap_v5_enabled() - グローバル v5 enable check
static inline int small_heap_v5_enabled(void) {
    static int g_enabled = -1;
    if (g_enabled == -1) {
        const char* e = getenv("HAKMEM_SMALL_HEAP_V5_ENABLED");
        g_enabled = (e && *e && *e != '0') ? 1 : 0;
    }
    return g_enabled;
}

// small_heap_v5_class_mask() - v5 対象クラスのビットマスク
static inline uint32_t small_heap_v5_class_mask(void) {
    static uint32_t g_mask = (uint32_t)-1;  // sentinel
    if (g_mask == (uint32_t)-1) {
        const char* e = getenv("HAKMEM_SMALL_HEAP_V5_CLASSES");
        if (e && *e) {
            g_mask = (uint32_t)strtoul(e, NULL, 0);
        } else {
            g_mask = 0x0;  // default: OFF
        }
    }
    return g_mask;
}

// small_heap_v5_class_enabled() - 指定クラスが v5 有効か
static inline int small_heap_v5_class_enabled(uint32_t class_idx) {
    if (class_idx >= 8) return 0;
    if (!small_heap_v5_enabled()) return 0;
    uint32_t mask = small_heap_v5_class_mask();
    return (mask & (1u << class_idx)) ? 1 : 0;
}

// 便利関数
static inline int small_heap_v5_c6_enabled(void) {
    return small_heap_v5_class_enabled(6);
}

static inline int small_heap_v5_c5_enabled(void) {
    return small_heap_v5_class_enabled(5);
}

static inline int small_heap_v5_c7_enabled(void) {
    return small_heap_v5_class_enabled(7);
}

#endif // HAKMEM_SMALLOBJECT_V5_ENV_BOX_H