use std::{error, fmt};

/// An enumeration of buffer creation errors

#[derive(Debug, Clone, Copy)]

#[non_exhaustive]

pub enum Error {

    /// No choices were provided to the Unstructured::choose call

    EmptyChoose,

    /// There was not enough underlying data to fulfill some request for raw

    /// bytes.

    NotEnoughData,

    /// The input bytes were not of the right format

    IncorrectFormat,

}

impl fmt::Display for Error {

    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {

        match self {

            Error::EmptyChoose => write!(

                f,

                "`arbitrary::Unstructured::choose` must be given a non-empty set of choices"

            ),

            Error::NotEnoughData => write!(

                f,

                "There is not enough underlying raw data to construct an `Arbitrary` instance"

            ),

            Error::IncorrectFormat => write!(

                f,

                "The raw data is not of the correct format to construct this type"

            ),

        }

    }

}

impl error::Error for Error {}

/// A `Result` with the error type fixed as `arbitrary::Error`.

///

/// Either an `Ok(T)` or `Err(arbitrary::Error)`.

pub type Result<T> = std::result::Result<T, Error>;