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use base64::DecodeError;
use std::fmt;
use std::string::FromUtf8Error;

/// Authorization Header Error
#[derive(Debug)]
pub enum AuthBasicError {
    /// The HTTP Authorization header value is invalid
    InvalidAuthorizationHeader,
    /// The HTTP Authorization header contains a valid
    /// value but the scheme is other than `Basic`
    InvalidScheme(String),
    /// The value expected as a base64 encoded `String` is not
    /// encoded correctly
    InvalidBase64Value(String),
    /// The provided binary is not a valid UTF-8 character
    InvalidUtf8Value(String),
}

impl fmt::Display for AuthBasicError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            AuthBasicError::InvalidAuthorizationHeader => write!(
                f,
                "Invalid value provided for the HTTP Authorization header"
            ),
            AuthBasicError::InvalidScheme(scheme) => {
                write!(f, "The scheme provided ({}) is not Basic", scheme)
            }
            AuthBasicError::InvalidBase64Value(message) => {
                write!(f, "The value have an invalid base64 encoding\n{}", message)
            }
            AuthBasicError::InvalidUtf8Value(message) => {
                write!(f, "Invalid UTF-8 Provided\n{}", message)
            }
        }
    }
}

impl From<DecodeError> for AuthBasicError {
    fn from(decode_error: DecodeError) -> Self {
        AuthBasicError::InvalidBase64Value(decode_error.to_string())
    }
}

impl From<FromUtf8Error> for AuthBasicError {
    fn from(utf8_err: FromUtf8Error) -> Self {
        AuthBasicError::InvalidUtf8Value(utf8_err.to_string())
    }
}