use crate::pki::EpfPkiCertificateValidationError;
use std::error::Error;
use std::fmt::{Display, Formatter};

#[derive(Debug)]
pub enum EpfHandshakeError {
    AlreadyTunnelled,
    UnsupportedProtocolVersion(usize),
    InvalidCertificate(EpfPkiCertificateValidationError),
    UntrustedCertificate,
    EncryptionError,
    MissingKeyProof,
}
impl Display for EpfHandshakeError {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            EpfHandshakeError::AlreadyTunnelled => write!(f, "Already tunneled"),
            EpfHandshakeError::UnsupportedProtocolVersion(v) => {
                write!(f, "Unsupported protocol version {}", v)
            }
            EpfHandshakeError::InvalidCertificate(e) => write!(f, "Invalid certificate: {}", e),
            EpfHandshakeError::UntrustedCertificate => {
                write!(f, "Certificate valid but not trusted")
            }
            EpfHandshakeError::EncryptionError => write!(f, "Encryption error"),
            EpfHandshakeError::MissingKeyProof => write!(f, "Missing key proof"),
        }
    }
}
impl Error for EpfHandshakeError {}