#ifndef HAKMEM_ACE_STATS_H
#define HAKMEM_ACE_STATS_H

#include <stdint.h>
#include <stdatomic.h>

// Sampling mask: if zero → off; else sample when (ctr & mask)==0
void hkm_ace_stats_init(void);
void hkm_ace_set_sample_mask(uint32_t mask);

// MidPool (2–32KiB)
void hkm_ace_stat_mid_attempt(int hit);

// LargePool (64KiB–1MiB)
void hkm_ace_stat_large_attempt(int hit);

// Fallback (malloc path for L1)
void hkm_ace_stat_l1_fallback(void);
// Free counters (L1 pools)
void hkm_ace_stat_mid_free(void);
void hkm_ace_stat_large_free(void);

// Snapshot for learner
typedef struct {
    uint64_t mid_hit, mid_miss;
    uint64_t large_hit, large_miss;
    uint64_t l1_fallback;
    uint64_t mid_free, large_free;
} hkm_ace_stats_snapshot_t;

void hkm_ace_stats_snapshot(hkm_ace_stats_snapshot_t* out, int reset);

#endif // HAKMEM_ACE_STATS_H