// This file is part of Substrate.

// Copyright (C) 2015-2021 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#[cfg(feature="std")]
use std::fmt;
#[cfg(feature="std")]
use std::error::Error as StdError;

#[derive(Debug, PartialEq, Eq, Clone)]
/// Error for trie node decoding.
pub enum Error {
	/// Bad format.
	BadFormat,
	/// Decoding error.
	Decode(codec::Error)
}

impl From<codec::Error> for Error {
	fn from(x: codec::Error) -> Self {
		Error::Decode(x)
	}
}

#[cfg(feature="std")]
impl StdError for Error {
	fn description(&self) -> &str {
		match self {
			Error::BadFormat => "Bad format error",
			Error::Decode(_) => "Decoding error",
		}
	}
}

#[cfg(feature="std")]
impl fmt::Display for Error {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		match self {
			Error::Decode(e) => write!(f, "Decode error: {}", e.what()),
			Error::BadFormat => write!(f, "Bad format"),
		}
	}
}
