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use crate::mnemonic_type::MnemonicType;

/// Type alias to use this library's `Error` type in a `Result`.
pub type Result<T> = std::result::Result<T, Error>;

/// Errors generated from this library.
#[derive(Debug)]
pub enum Error {
    /// Invalid checksum.
    InvalidChecksum,
    /// Invalid word in phrase.
    InvalidWord,
    /// Invalid key size.
    InvalidKeySize(usize),
    /// Invalid number of words in phrase.
    InvalidWordLength(usize),
    /// Invalid entropy length of mnemonic type.
    InvalidEntropyLength(usize, MnemonicType),
}

impl std::error::Error for Error {}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Error::InvalidChecksum => write!(f, "invalid checksum"),
            Error::InvalidWord => write!(f, "invalid word in phrase"),
            Error::InvalidKeySize(size) => write!(f, "invalid key size: {}", size),
            Error::InvalidWordLength(size) => {
                write!(f, "invalid number of words in phrase: {}", size)
            }
            Error::InvalidEntropyLength(size, ty) => write!(
                f,
                "invalid entropy length {}bits for mnemonic type {:?}",
                size, ty
            ),
        }
    }
}