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use std::fmt::{self, Display};

/// An error that occurred while attempting to deal with the gateway.
///
/// Note that - from a user standpoint - there should be no situation in which
/// you manually handle these.
#[derive(Clone, Debug)]
pub enum Error {
    /// The connection closed, potentially uncleanly.
    Closed(Option<u16>, String),
    /// Expected a Hello during a handshake
    ExpectedHello,
    /// Expected a Ready or an InvalidateSession
    InvalidHandshake,
    /// When a session Id was expected (for resuming), but was not present.
    NoSessionId,
    /// Failed to reconnect after a number of attempts.
    ReconnectFailure,
}

impl Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::Closed(s, ref v) => {
                f.write_str(&format!("Connection closed {:?}: {:?}", s, v))
            },
            Error::ExpectedHello => f.write_str("Expected Hello during handshake"),
            Error::InvalidHandshake => f.write_str("Expected Ready or InvalidateSession"),
            Error::NoSessionId => f.write_str("No Session Id present"),
            Error::ReconnectFailure => f.write_str("Failed to Reconnect"),
        }
    }
}