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use crate::{base64, bitreader};
use std::char::DecodeUtf16Error;

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

#[derive(Debug, PartialEq)]
pub enum Error {
    UnexpectedEof,
    InvalidByte(u8),
    Utf16Error(DecodeUtf16Error),
    InvalidHeader(u64),
}

impl From<base64::Error> for Error {
    fn from(err: base64::Error) -> Self {
        match err {
            base64::Error::InvalidByte(b) => Error::InvalidByte(b),
        }
    }
}

impl From<bitreader::NoError> for Error {
    fn from(_: bitreader::NoError) -> Self {
        Error::InvalidByte(0)
    }
}

impl From<DecodeUtf16Error> for Error {
    fn from(err: DecodeUtf16Error) -> Self {
        Error::Utf16Error(err)
    }
}

impl<T> From<Option<T>> for Error {
    fn from(_: Option<T>) -> Self {
        Error::UnexpectedEof
    }
}