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use failure::Fail;

/// TallyError enum contains a list of all errors that may occur during a tally.
#[derive(Debug, Fail)]
pub enum TallyError {
    /// A vote contains duplicate candidates.
    #[fail(display = "tallystick: vote contains duplicate candidates")]
    VoteHasDuplicateCandidates,

    /// A vote contains an unknown candidate.
    #[fail(display = "tallystick: vote contains unknown candidate")]
    UnknownCandidate,
}

/// ParseError enum contains a list of all errors that may occur during vote parsing.
#[derive(Debug, Fail)]
pub enum ParseError {
    #[fail(display = "tallystick: error parsing numeric value {}", 0)]
    /// Unable to parse this numeric value
    ParseError(String),

    #[fail(display = "tallystick: error reading vote data: {}", 0)]
    /// Unable to read cursor
    ReadError(std::io::Error),
}

impl From<std::io::Error> for ParseError {
    fn from(error: std::io::Error) -> Self {
        ParseError::ReadError(error)
    }
}