use thiserror::Error;

#[derive(Debug, Error)]
pub enum ProtocolError {
    #[error("invalid seed length")]
    InvalidSeedLength,

    #[error("invalid mnemonic")]
    InvalidMnemonic,

    #[error("invalid fingerprint format")]
    InvalidFingerprint,

    #[error("invalid signature")]
    InvalidSignature,

    #[error("pre-key signature verification failed")]
    PreKeySignatureInvalid,

    #[error("X3DH key exchange failed: {0}")]
    X3DHFailed(String),

    #[error("ratchet error: {0}")]
    RatchetError(String),

    #[error("decryption failed")]
    DecryptionFailed,

    #[error("message too old (exceeded max skip)")]
    MaxSkipExceeded,

    #[error("serialization error: {0}")]
    SerializationError(String),
}