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use std::{
    error::Error as StdError,
    fmt::{
        Display,
        Formatter,
        Result as FmtResult
    }
};

/// An error returned from the [`Client`].
///
/// This is always wrapped within the library's generic [`Error::Client`]
/// variant.
///
/// [`Client`]: struct.Client.html
/// [`Error`]: ../enum.Error.html
/// [`Error::Client`]: ../enum.Error.html#variant.Client
/// [`GuildId::ban`]: ../model/id/struct.GuildId.html#method.ban
#[allow(clippy::enum_variant_names)]
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub enum Error {
    /// When the token provided is invalid. This is returned when validating a
    /// token through the [`validate_token`] function.
    ///
    /// [`validate_token`]: fn.validate_token.html
    InvalidToken,
    /// When a shard has completely failed to reboot after resume and/or
    /// reconnect attempts.
    ShardBootFailure,
    /// When all shards that the client is responsible for have shutdown with an
    /// error.
    Shutdown,
    #[doc(hidden)]
    __Nonexhaustive,
}

impl Display for Error {
    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
        match self {
            Error::InvalidToken => f.write_str("The provided token was invalid"),
            Error::ShardBootFailure => f.write_str("Failed to (re-)boot a shard"),
            Error::Shutdown => f.write_str("The clients shards shutdown"),
            Error::__Nonexhaustive => unreachable!(),
        }
    }
}

impl StdError for Error {
    fn description(&self) -> &str {
        match *self {
            Error::InvalidToken => "The provided token was invalid",
            Error::ShardBootFailure => "Failed to (re-)boot a shard",
            Error::Shutdown => "The clients shards shutdown",
            Error::__Nonexhaustive => unreachable!(),
        }
    }
}