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use core::fmt;

#[derive(Debug, PartialEq)]
pub enum ParseBioError {
    UnrecognisedBase(u8),
    MismatchedLength(usize, usize),
    SequenceTooLong(usize, usize),
}

impl fmt::Display for ParseBioError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            ParseBioError::UnrecognisedBase(byte) => {
                if byte.is_ascii_alphanumeric() {
                    write!(
                        f,
                        "Unrecognised character: '{}' ({byte:#04X?})",
                        *byte as char,
                    )
                } else {
                    write!(f, "Unrecognised character: {byte:#04X?}")
                }
            }

            ParseBioError::MismatchedLength(got, expected) => {
                write!(f, "Expected length {expected}, got {got}")
            }

            ParseBioError::SequenceTooLong(got, expected) => {
                write!(f, "Expected length <= {expected}, got {got}")
            }
        }
    }
}

// #![feature(error_in_core)
impl std::error::Error for ParseBioError {}