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// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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 Ethereum 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 Ethereum.  If not, see <http://www.gnu.org/licenses/>.

use std::{error, fmt};

#[derive(Debug)]
/// Crypto error
pub enum Error {
    /// Invalid secret key
    InvalidSecret,
    /// Invalid public key
    InvalidPublic,
    /// Invalid address
    InvalidAddress,
    /// Invalid EC signature
    InvalidSignature,
    /// Invalid y-parity
    InvalidYParity,
    /// 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::InvalidYParity => "Invalid y Parity".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) }
}