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use crate::algorithm::AlgorithmType;
use base64::DecodeError;
use crypto_mac::MacError;
use serde_json::Error as JsonError;
use std::fmt;
use std::string::FromUtf8Error;

#[derive(Debug)]
pub enum Error {
    AlgorithmMismatch(AlgorithmType, AlgorithmType),
    Format,
    Base64(DecodeError),
    Json(JsonError),
    Utf8(FromUtf8Error),
    RustCryptoMac(MacError),
    #[cfg(feature = "openssl")]
    OpenSsl(openssl::error::ErrorStack),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
        match *self {
            Error::AlgorithmMismatch(a, b) => {
                write!(f, "Expected algorithm type {:?} but found {:?}", a, b)
            }
            Error::Format => write!(f, "Format"),
            Error::Base64(ref x) => write!(f, "{}", x),
            Error::Json(ref x) => write!(f, "{}", x),
            Error::Utf8(ref x) => write!(f, "{}", x),
            Error::RustCryptoMac(ref x) => write!(f, "{}", x),
            #[cfg(feature = "openssl")]
            Error::OpenSsl(ref x) => write!(f, "{}", x),
        }
    }
}

macro_rules! error_wrap {
    ($f: ty, $e: expr) => {
        impl From<$f> for Error {
            fn from(f: $f) -> Error {
                $e(f)
            }
        }
    };
}

error_wrap!(DecodeError, Error::Base64);
error_wrap!(JsonError, Error::Json);
error_wrap!(FromUtf8Error, Error::Utf8);
error_wrap!(MacError, Error::RustCryptoMac);
#[cfg(feature = "openssl")]
error_wrap!(openssl::error::ErrorStack, Error::OpenSsl);