use iterator::*;
use UPPERCASE_ENCODING;

pub fn encode(input: u64) -> String {
    let mut fits: Vec<_> = FiveBitIterator::new(input).collect();
    let mut buf = String::new();
    while let Some(fit) = fits.pop() {
        unsafe {
            buf.push(*UPPERCASE_ENCODING.get_unchecked(fit as usize) as char);
        }
    }
    buf
}

#[cfg(test)]
mod tests {
    use encoding::encode;

    #[test]
    fn zero_returns_zero() {
        let input = 0;
        let expected = "0";
        let actual = encode(input);

        assert_eq!(expected, &*actual);
    }

    #[test]
    fn large_value_returns_correct_large_value() {
        let input = 65535;
        let expected = "1ZZZ";
        let actual = encode(input);

        assert_eq!(expected, &*actual);
    }
}