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use core::fmt::{self, Display, Formatter};

#[cfg(feature = "std")]
use std::error::Error;

#[derive(Debug, Clone)]
pub enum Base32Error {
    /// the fallback variant
    Invalid,
    /// may not be valid but missing the padding part is guaranteed
    PaddingMust,
    /// may not be valid and the padding part seems to exist
    PaddingNotAllow,
}

impl Display for Base32Error {
    #[inline]
    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
        match self {
            Base32Error::Invalid => f.write_str("invalid Base32"),
            Base32Error::PaddingMust => f.write_str("padding not found"),
            Base32Error::PaddingNotAllow => f.write_str("padding not allowed"),
        }
    }
}

#[cfg(feature = "std")]
impl Error for Base32Error {}