use std::error::Error;
use std::fmt::{ self, Display, Formatter };

/// Result Boxed Error
pub type ResBE<T> = Result<T, Box<dyn Error>>;

#[allow(unused)]
#[derive(Clone, Debug)]
pub enum DlError {
    BadHttpStatus,
    ContentLengthUnknown,
    Other(String)
}

impl Error for DlError {}

impl Display for DlError {

    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match self {
            DlError::BadHttpStatus => write!(f, "Bad http response status"),
            DlError::ContentLengthUnknown => write!(f, "Content-Length is unknown"),
            DlError::Other(s) => write!(f, "Unknown download error: '{}'", s)
        }
    }

}