continuwuity/src/core/utils/rand.rs

use std::{
	ops::Range,
	time::{Duration, SystemTime},
};

use arrayvec::ArrayString;
use rand::{Rng, RngExt, seq::SliceRandom};

pub fn shuffle<T>(vec: &mut [T]) {
	let mut rng = rand::rng();
	vec.shuffle(&mut rng);
}

pub fn string(length: usize) -> String {
	rand::rng()
		.sample_iter(&rand::distr::Alphanumeric)
		.take(length)
		.map(char::from)
		.collect()
}

#[inline]
pub fn string_array<const LENGTH: usize>() -> ArrayString<LENGTH> {
	let mut ret = ArrayString::<LENGTH>::new();
	rand::rng()
		.sample_iter(&rand::distr::Alphanumeric)
		.take(LENGTH)
		.map(char::from)
		.for_each(|c| ret.push(c));

	ret
}

#[inline]
#[must_use]
pub fn time_from_now_secs(range: Range<u64>) -> SystemTime {
	SystemTime::now()
		.checked_add(secs(range))
		.expect("range does not overflow SystemTime")
}

#[must_use]
pub fn secs(range: Range<u64>) -> Duration { Duration::from_secs(rand::random_range(range)) }