use std::fmt;

#[derive(Debug)]
pub enum SieveError {
    ConnectionFailed(String),
    TlsFailed(String),
    AuthenticationFailed(String),
    InsecureAuthenticationBlocked,
    Protocol(String),
    ServerRejected(String),
    Timeout,
    ScriptTooLarge,
}

impl fmt::Display for SieveError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::ConnectionFailed(msg) => write!(f, "ManageSieve connection failed: {msg}"),
            Self::TlsFailed(msg) => write!(f, "ManageSieve TLS failed: {msg}"),
            Self::AuthenticationFailed(msg) => {
                write!(f, "ManageSieve authentication failed: {msg}")
            }
            Self::InsecureAuthenticationBlocked => write!(
                f,
                "ManageSieve plaintext authentication is blocked; use STARTTLS/implicit TLS or explicitly enable SIEVE_ALLOW_INSECURE_AUTH"
            ),
            Self::Protocol(msg) => write!(f, "ManageSieve protocol error: {msg}"),
            Self::ServerRejected(msg) => {
                write!(f, "ManageSieve server rejected the command: {msg}")
            }
            Self::Timeout => write!(f, "ManageSieve operation timed out"),
            Self::ScriptTooLarge => write!(f, "Sieve script exceeds the RustBox 0.2.0 size limit"),
        }
    }
}

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