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use core::fmt;
use core::str::Utf8Error;

/// An error returned when a conversion from a `&str` to a `PascalString` fails.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TryFromStrError {
    /// The string is too long to fit into a `PascalString`.
    TooLong,
}

/// An error returned when a conversion from a `&[u8]` to a `PascalString` fails.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum TryFromBytesError {
    /// The string is too long to fit into a `PascalString`.
    TooLong,
    /// The string is not valid UTF-8.
    Utf8Error(Utf8Error),
}

impl From<Utf8Error> for TryFromBytesError {
    fn from(e: Utf8Error) -> Self {
        TryFromBytesError::Utf8Error(e)
    }
}

impl From<TryFromStrError> for TryFromBytesError {
    fn from(e: TryFromStrError) -> Self {
        match e {
            TryFromStrError::TooLong => TryFromBytesError::TooLong,
        }
    }
}

impl fmt::Display for TryFromStrError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            TryFromStrError::TooLong => f.write_str("string too long"),
        }
    }
}

impl fmt::Display for TryFromBytesError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            TryFromBytesError::TooLong => f.write_str("string too long"),
            TryFromBytesError::Utf8Error(e) => e.fmt(f),
        }
    }
}