pub mod mux;

use crate::error::Error;
use anyhow::Result;
use rand::{thread_rng, Rng};

const RUNES_ALPHA: &[u8] = b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

/// math_rand_alpha generates a mathmatical random alphabet sequence of the requested length.
pub fn math_rand_alpha(n: usize) -> String {
    let mut rng = thread_rng();

    let rand_string: String = (0..n)
        .map(|_| {
            let idx = rng.gen_range(0..RUNES_ALPHA.len());
            RUNES_ALPHA[idx] as char
        })
        .collect();

    rand_string
}

/// flatten_errs flattens multiple errors into one
pub fn flatten_errs(errs: Vec<anyhow::Error>) -> Result<()> {
    if errs.is_empty() {
        Ok(())
    } else {
        let errs_strs: Vec<String> = errs.into_iter().map(|e| e.to_string()).collect();
        Err(Error::new(errs_strs.join("\n")).into())
    }
}