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use core::fmt;

/// Type alias to use this library's [`Error`] type in a `Result`.
pub type Result<T> = core::result::Result<T, Error>;

/// Error types
#[derive(Debug)]
pub enum Error {
  /// Unknown CID codec.
  UnknownCodec,
  /// Input data is too short.
  InputTooShort,
  /// Multibase or multihash codec failure
  ParsingError,
  /// Invalid CID version.
  InvalidCidVersion,
  /// Invalid CIDv0 codec.
  InvalidCidV0Codec,
  /// Invalid CIDv0 multihash.
  InvalidCidV0Multihash,
  /// Invalid CIDv0 base encoding.
  InvalidCidV0Base,
  /// Varint decode failure.
  VarIntDecodeError,
  /// Io error.
  #[cfg(feature = "std")]
  Io(std::io::Error),
}

#[cfg(feature = "std")]
impl std::error::Error for Error {}

impl fmt::Display for Error {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    use self::Error::*;
    let error = match self {
      UnknownCodec => "Unknown codec",
      InputTooShort => "Input too short",
      ParsingError => "Failed to parse multihash",
      InvalidCidVersion => "Unrecognized CID version",
      InvalidCidV0Codec => "CIDv0 requires a DagPB codec",
      InvalidCidV0Multihash => "CIDv0 requires a Sha-256 multihash",
      InvalidCidV0Base => "CIDv0 requires a Base58 base",
      VarIntDecodeError => "Failed to decode unsigned varint format",
      #[cfg(feature = "std")]
      Io(err) => return write!(f, "{}", err),
    };

    f.write_str(error)
  }
}

#[cfg(feature = "std")]
impl From<multibase::Error> for Error {
  fn from(_: multibase::Error) -> Error {
    Error::ParsingError
  }
}

impl From<sp_multihash::Error> for Error {
  fn from(_: sp_multihash::Error) -> Error {
    Error::ParsingError
  }
}

impl From<unsigned_varint::decode::Error> for Error {
  fn from(_: unsigned_varint::decode::Error) -> Self {
    Error::VarIntDecodeError
  }
}

#[cfg(feature = "std")]
impl From<unsigned_varint::io::ReadError> for Error {
  fn from(err: unsigned_varint::io::ReadError) -> Self {
    use unsigned_varint::io::ReadError::*;
    match err {
      Io(err) => Self::Io(err),
      _ => Self::VarIntDecodeError,
    }
  }
}

#[cfg(feature = "std")]
impl From<std::io::Error> for Error {
  fn from(err: std::io::Error) -> Self {
    Self::Io(err)
  }
}