/**
 * fc_test_consumer.c — Dev utility: attach to a framecache slot and print stats.
 *
 * Usage: fc_test_consumer <slot_id> [wait_ms]
 */
#include "fc_client.h"
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <time.h>

static volatile int g_run = 1;
static void on_sig(int s) { (void)s; g_run = 0; }

int main(int argc, char **argv)
{
    if (argc < 2) {
        fprintf(stderr, "Usage: %s <slot_id> [wait_ms]\n", argv[0]);
        return 1;
    }
    const char *slot_id = argv[1];
    uint64_t wait_ms = argc >= 3 ? (uint64_t)atoi(argv[2]) : 30000;

    signal(SIGINT,  on_sig);
    signal(SIGTERM, on_sig);

    fprintf(stderr, "Opening slot '%s' (wait up to %llums)...\n",
            slot_id, (unsigned long long)wait_ms);

    fc_consumer_t *c = fc_consumer_open(slot_id, wait_ms);
    if (!c) {
        fprintf(stderr, "Failed to open slot '%s'\n", slot_id);
        return 1;
    }
    fprintf(stderr, "Slot opened. Reading frames (Ctrl+C to stop)...\n");

    uint64_t total = 0, dropped = 0;
    struct timespec t0;
    clock_gettime(CLOCK_MONOTONIC, &t0);

    while (g_run) {
        fc_frame_ref_t ref;
        int rc = fc_consumer_read(c, &ref, 2000);
        if (rc == FC_TIMEOUT) continue;
        if (rc == FC_ERROR)   { fprintf(stderr, "read error\n"); break; }
        if (rc == FC_LAPPED)  { /* torn copy — no valid frame, read again */ continue; }
        if (rc == FC_DROPPED) {
            dropped = fc_consumer_dropped(c);
            fprintf(stderr, "[WARN] consumer fell behind — total dropped: %llu\n",
                    (unsigned long long)dropped);
        }
        total++;

        /* Print stats every 100 frames */
        if (total % 100 == 0) {
            struct timespec now;
            clock_gettime(CLOCK_MONOTONIC, &now);
            double elapsed = (now.tv_sec - t0.tv_sec)
                           + (now.tv_nsec - t0.tv_nsec) * 1e-9;
            fprintf(stdout, "frames=%llu dropped=%llu fps=%.2f pts_us=%llu\n",
                    (unsigned long long)total,
                    (unsigned long long)fc_consumer_dropped(c),
                    total / elapsed,
                    (unsigned long long)ref.pts_us);
            fflush(stdout);
        }
    }

    fprintf(stderr, "Done. total=%llu dropped=%llu\n",
            (unsigned long long)total,
            (unsigned long long)fc_consumer_dropped(c));
    fc_consumer_close(c);
    return 0;
}