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/// Errors produced by `ocelot`.
#[derive(Debug)]
pub enum Error {
    /// The input length is invalid.
    InvalidInputLength,
    /// An I/O error has occurred.
    IoError(std::io::Error),
    /// Some other error, given by `String`.
    Other(String),
    /// Coin tossing failed.
    CoinTossError(scuttlebutt::cointoss::Error),
    /// Correlation check failed i.e, `w != u'Δ + v`.
    CorrelationCheckFailed,
    /// EQ check failed.
    EqCheckFailed,
    /// Commitment opening failed.
    InvalidOpening,
}

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

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Error {
        Error::IoError(e)
    }
}

impl From<scuttlebutt::cointoss::Error> for Error {
    fn from(e: scuttlebutt::cointoss::Error) -> Error {
        Error::CoinTossError(e)
    }
}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Error::InvalidInputLength => "invalid input length".fmt(f),
            Error::IoError(e) => write!(f, "IO error: {}", e),
            Error::Other(s) => write!(f, "other error: {}", s),
            Error::CoinTossError(e) => write!(f, "coin toss error: {}", e),
            Error::CorrelationCheckFailed => "Correlation check failed!, i.e, w != u'Δ + v".fmt(f),
            Error::EqCheckFailed => "EQ check failed!".fmt(f),
            Error::InvalidOpening => "Invalid commitment opening!".fmt(f),
        }
    }
}