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// Copyright 2015-2018 Parity Technologies (UK) Ltd.
// This file is part of Parity.

// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with Parity.  If not, see <http://www.gnu.org/licenses/>.

use std::{fmt, error};

#[derive(Debug)]
/// Crypto error
pub enum Error {
	/// Invalid secret key
	InvalidSecret,
	/// Invalid public key
	InvalidPublic,
	/// Invalid address
	InvalidAddress,
	/// Invalid EC signature
	InvalidSignature,
	/// Invalid AES message
	InvalidMessage,
	/// IO Error
	Io(::std::io::Error),
	/// Custom
	Custom(String),
}

impl fmt::Display for Error {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		let msg = match *self {
			Error::InvalidSecret => "Invalid secret".into(),
			Error::InvalidPublic => "Invalid public".into(),
			Error::InvalidAddress => "Invalid address".into(),
			Error::InvalidSignature => "Invalid EC signature".into(),
			Error::InvalidMessage => "Invalid AES message".into(),
			Error::Io(ref err) => format!("I/O error: {}", err),
			Error::Custom(ref s) => s.clone(),
		};

		f.write_fmt(format_args!("Crypto error ({})", msg))
	}
}

impl error::Error for Error {
	fn description(&self) -> &str {
		"Crypto error"
	}
}

impl Into<String> for Error {
	fn into(self) -> String {
		format!("{}", self)
	}
}

impl From<::secp256k1::Error> for Error {
	fn from(e: ::secp256k1::Error) -> Error {
		match e {
			::secp256k1::Error::InvalidMessage => Error::InvalidMessage,
			::secp256k1::Error::InvalidPublicKey => Error::InvalidPublic,
			::secp256k1::Error::InvalidSecretKey => Error::InvalidSecret,
			_ => Error::InvalidSignature,
		}
	}
}

impl From<::std::io::Error> for Error {
	fn from(err: ::std::io::Error) -> Error {
		Error::Io(err)
	}
}