#ifndef HAKMEM_ALLOC_GATE_STATS_BOX_H
#define HAKMEM_ALLOC_GATE_STATS_BOX_H

#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include "../hakmem_build_flags.h"

typedef struct AllocGateStats {
    uint64_t total_calls;            // malloc_tiny_fast 入口

    uint64_t size_to_class_calls;    // size→class 変換
    uint64_t route_for_class_calls;  // class→route 判定
    uint64_t env_checks;             // alloc-side ENV 判定数

    // クラス別分布
    uint64_t class_calls[8];         // C0〜C7 呼び出し数
} AllocGateStats;

// ENV gate
static inline bool alloc_gate_stats_enabled(void) {
#if !HAKMEM_DEBUG_COUNTERS
    return false;
#else
    static int g_enabled = -1;
    if (__builtin_expect(g_enabled == -1, 0)) {
        const char* e = getenv("HAKMEM_ALLOC_GATE_STATS");
        g_enabled = (e && *e && *e != '0') ? 1 : 0;
    }
    return g_enabled;
#endif
}

// Global stats instance
extern AllocGateStats g_alloc_gate_stats;

// Increment macros (with unlikely guard)
#if HAKMEM_DEBUG_COUNTERS
#define ALLOC_GATE_STAT_INC(field) \
    do { if (__builtin_expect(alloc_gate_stats_enabled(), 0)) { \
        g_alloc_gate_stats.field++; \
    } } while(0)

#define ALLOC_GATE_STAT_INC_CLASS(class_idx) \
    do { if (__builtin_expect(alloc_gate_stats_enabled(), 0)) { \
        if ((class_idx) >= 0 && (class_idx) < 8) g_alloc_gate_stats.class_calls[class_idx]++; \
    } } while(0)
#else
#define ALLOC_GATE_STAT_INC(field) ((void)0)
#define ALLOC_GATE_STAT_INC_CLASS(class_idx) ((void)0)
#endif

#endif // HAKMEM_ALLOC_GATE_STATS_BOX_H