#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include "types.h"

#define THREADS 6

void* gen_uuids(void* count) {
    FILE* random = fopen("/dev/urandom", "r");
    if (!random) { perror("fopen"); return NULL; }
    for (long long i = 0; i <= (long long)count; ++i) {
        u8 uuid[16];
        fread(uuid, 1, 16, random);

        /* set uuid version to 4 and variant to leach-salz */
        uuid[6] = (uuid[6] & 0x0F) | 0x40;
        uuid[8] = (uuid[8] & 0x3F) | 0x80;

        printf("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x\n", uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
    }

    fclose(random);
    return NULL;
}

int main(int argc, char* argv[]) {
    long long count = 0;
    switch (argc) {
        case 1:
            count = 1;
            break;
        case 2:
            count = atoll(argv[1]);
            break;
        default:
            count = 1;
            break;
    }

    printf("distributing load across %d threads", THREADS);

    /* distributing load across threads */
    long long uuids_per_thread = count / THREADS;
    printf(".");
    pthread_t threads[THREADS];
    printf(".\n");
    for (long long i = 0; i < THREADS; ++i) {
        pthread_create(&threads[i], NULL, gen_uuids, (void*)uuids_per_thread);
    }

    for (long long i = 0; i < THREADS; ++i) {
        pthread_join(threads[i], NULL);
    }

    return 0;
}