// init_diag_box.h — 初期化時の診断（SIGSEGV ハンドラ、ベースライン、ビルドバナー）
#ifndef INIT_DIAG_BOX_H
#define INIT_DIAG_BOX_H

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

// Debug-only SIGSEGV handler (gated by HAKMEM_DEBUG_SEGV)
static inline void box_diag_install_sigsegv_handler(void (*handler)(int)) {
    const char* dbg = getenv("HAKMEM_DEBUG_SEGV");
    if (!dbg || atoi(dbg) == 0) return;

    struct sigaction sa;
    memset(&sa, 0, sizeof(sa));
    sa.sa_flags = SA_RESETHAND;
    sa.sa_handler = handler;
    sigaction(SIGSEGV, &sa, NULL);
}

static inline void box_diag_record_baseline(void) {
#ifdef __linux__
    memset(g_latency_histogram, 0, sizeof(g_latency_histogram));
    g_latency_samples = 0;

    get_page_faults(&g_baseline_soft_pf, &g_baseline_hard_pf);
    g_baseline_rss_kb = get_rss_kb();

    HAKMEM_LOG("Baseline: soft_pf=%lu, hard_pf=%lu, rss=%lu KB\n",
               (unsigned long)g_baseline_soft_pf,
               (unsigned long)g_baseline_hard_pf,
               (unsigned long)g_baseline_rss_kb);
#endif
}

static inline void box_diag_print_banner(void) {
    const char* bf = "UNKNOWN";
#ifdef HAKMEM_BUILD_RELEASE
    bf = "RELEASE";
#elif defined(HAKMEM_BUILD_DEBUG)
    bf = "DEBUG";
#endif
    (void)bf;
    HAKMEM_LOG(
        "[Build] Flavor=%s  Flags: HEADER_CLASSIDX=%d, AGGRESSIVE_INLINE=%d, "
        "POOL_TLS_PHASE1=%d, POOL_TLS_PREWARM=%d\n",
        bf,
#if HAKMEM_TINY_HEADER_CLASSIDX
        1,
#else
        0,
#endif
#ifdef HAKMEM_TINY_AGGRESSIVE_INLINE
        1,
#else
        0,
#endif
#ifdef HAKMEM_POOL_TLS_PHASE1
        1,
#else
        0,
#endif
#ifdef HAKMEM_POOL_TLS_PREWARM
        1
#else
        0
#endif
    );
}

#endif  // INIT_DIAG_BOX_H