#include "prof.h"

prof_zone_t prof_zones[PROF_MAX_ZONES];
int         prof_nzones = 0;
int         prof_enabled = 0;
uint64_t    prof_frame_count = 0;

extern "C" void prof_init(void)
{
    const char *e = getenv("KOBO_PROF");
    prof_enabled = (e && *e && *e != '0') ? 1 : 0;
    if (prof_enabled)
        fprintf(stderr, "[prof] enabled (dump every %d frames)\n",
                PROF_DUMP_EVERY_FRAMES);
}

extern "C" void prof_dump(FILE *f)
{
    if (!prof_enabled) return;
    fprintf(f, "[prof] frame=%llu zones=%d\n",
            (unsigned long long)prof_frame_count, prof_nzones);
    for (int i = 0; i < prof_nzones; ++i) {
        prof_zone_t *z = &prof_zones[i];
        double ns_per_call = z->calls ? (double)z->total_ns / (double)z->calls : 0.0;
        double total_ms = (double)z->total_ns / 1.0e6;
        fprintf(f, "  %-28s calls=%-10llu total_ms=%-10.3f ns/call=%.1f\n",
                z->name,
                (unsigned long long)z->calls,
                total_ms,
                ns_per_call);
    }
    fflush(f);
}

extern "C" void prof_frame_tick(void)
{
    if (!prof_enabled) return;
    ++prof_frame_count;
    if (prof_frame_count % PROF_DUMP_EVERY_FRAMES == 0)
        prof_dump(stderr);
}