#include <c_HardwareConcurrency.h>

/* ================================================================================================================== */
/* Cross-Platform OS Handle Interceptions */

#if defined(_WIN32) || defined(_WIN64)
    #ifndef WIN32_LEAN_AND_MEAN
        #define WIN32_LEAN_AND_MEAN
    #endif
    #include <windows.h>
#elif defined(__linux__) || defined(__ANDROID__) || defined(__hpux) || defined(_AIX)
    #include <unistd.h>
#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
    #include <unistd.h>
    #include <sys/types.h>
    #include <sys/sysctl.h>
#endif

c_size_t c_HardwareConcurrency(void) {
#if defined(_WIN32) || defined(_WIN64)
    SYSTEM_INFO sys_info;
    GetSystemInfo(&sys_info);
    return (c_size_t)sys_info.dwNumberOfProcessors > 0 ? (c_size_t)sys_info.dwNumberOfProcessors : 1;

#elif defined(__linux__) || defined(__ANDROID__) || defined(__hpux) || defined(_AIX)
    long cores = sysconf(_SC_NPROCESSORS_ONLN);
    return (cores > 0) ? (c_size_t)cores : 1;

#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
    int mib[2];
    mib[0] = CTL_HW;
    mib[1] = HW_NCPU; /* Fallback baseline key token selector */

#ifdef HW_AVAILCPU
    mib[1] = HW_AVAILCPU; /* Preferred choice: online/available logical cores count query */
#endif

    int num_cores = 0;
    size_t len = sizeof(num_cores);
    if (sysctl(mib, 2, &num_cores, &len, NULL, 0) == 0 && num_cores > 0) {
        return (c_size_t)num_cores;
    }
    return 1;

#else
    /* Safe fallback anchor primitive for completely unknown or specialized bare-metal setups */
    return 1;
#endif
}