use crate::ssh::{SshKeyExchangeProcessingError, SshMessageID};
use thiserror::Error;

#[derive(Debug, Error)]
pub enum OperationalError {
    #[error("Configuration error")]
    ConfigurationError,
    #[error("Failed to connect to target address")]
    Connection,
    #[error("Failed to complete initial read: {0}")]
    InitialRead(std::io::Error),
    #[error("SSH banner was not formatted in UTF-8: {0}")]
    BannerError(std::str::Utf8Error),
    #[error("Invalid initial SSH versionling line: {line}")]
    InvalidHeaderLine { line: String },
    #[error("Error writing initial banner: {0}")]
    WriteBanner(std::io::Error),
    #[error("Unexpected disconnect from other side.")]
    Disconnect,
    #[error("{message} in unexpected place.")]
    UnexpectedMessage { message: SshMessageID },
    #[error("User authorization failed.")]
    UserAuthFailed,
    #[error("Request failed.")]
    RequestFailed,
    #[error("Failed to open channel.")]
    OpenChannelFailure,
    #[error("Other side closed connection.")]
    OtherClosed,
    #[error("Other side sent EOF.")]
    OtherEof,
    #[error("Channel failed.")]
    ChannelFailure,
    #[error("Error in initial handshake: {0}")]
    KeyxProcessingError(#[from] SshKeyExchangeProcessingError),
    #[error("Call into random number generator failed: {0}")]
    RngFailure(#[from] rand::Error),
    #[error("Invalid port number '{port_string}': {error}")]
    InvalidPort {
        port_string: String,
        error: std::num::ParseIntError,
    },
    #[error("Invalid hostname '{0}'")]
    InvalidHostname(String),
    #[error("Unable to parse host address")]
    UnableToParseHostAddress,
}