#pragma once

#include <stdint.h>
#include "misc_utils.h"

typedef struct {
    uint32_t state;
} RandomEngine;

static void RandomEngine_init(RandomEngine* self) {
    self->state = 0x6d2b79f5u;
}

static uint32_t RandomEngine_rnd(RandomEngine* self) {
    uint32_t x = self->state;

    if (x == 0) {
        x = 0x6d2b79f5u;
    }

    x ^= x << 13;
    x ^= x >> 17;
    x ^= x << 5;
    x = x * 1664525u + 1013904223u;

    self->state = x;
    return x;
}

static uint32_t RandomEngine_rnd_interval(
    RandomEngine* self, uint32_t from, uint32_t until) {
    check(from < until);
    return from + RandomEngine_rnd(self) % (until - from);
}