import string

import numpy as np


def randbool(size=(), p: float = 0.5):
    return np.random.rand(*size) <= p


RANDS_CHARS = np.array(list(string.ascii_letters + string.digits), dtype=(np.str_, 1))
RANDU_CHARS = np.array(
    list("".join(map(chr, range(1488, 1488 + 26))) + string.digits),
    dtype=(np.unicode_, 1),
)


def rands_array(nchars, size, dtype="O", replace=True) -> np.ndarray:
    """
    Generate an array of byte strings.
    """
    retval = (
        np.random.choice(RANDS_CHARS, size=nchars * np.prod(size), replace=replace)
        .view((np.str_, nchars))
        .reshape(size)
    )
    return retval.astype(dtype)


def rands(nchars) -> str:
    """
    Generate one random byte string.

    See `rands_array` if you want to create an array of random strings.

    """
    return "".join(np.random.choice(RANDS_CHARS, nchars))