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/*  
 * Copyright (c) 2018 Kalev Anri Kalda <github.com/koala-kalda>
 * 
 * This program is free software: you can redistribute it and/or modify 
 * it under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation, either version 3 of the License, or (at your 
 * option) any later version.
 * 
 * This program 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 Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 * 
 * This file incorporates work covered by the following copyright and
 * permission notice:  
 * 
 *   Copyright (c) 2015-2018 Alex Maslakov, <gildedhonour.com>,
 *   <alexmaslakov.me>
 *   
 *   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.
 */

use std::io::Error as IoError;
use serde_json::Error as SJError;
use openssl::error::ErrorStack;
use base64::DecodeError as B64Error;
use std::error;
use std::fmt;

macro_rules! impl_error {
    ($from:ty, $to:path) => {
        impl From<$from> for Error {
            fn from(e: $from) -> Self {
                $to(format!("{:?}", e))
            }
        }
    }
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Error {
    SignatureExpired,
    SignatureInvalid,
    JWTInvalid,
    IssuerInvalid,
    ExpirationInvalid,
    AudienceInvalid,
    FormatInvalid(String),
    IoError(String),
    OpenSslError(String),
    ProtocolError(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Error::SignatureExpired => write!(f, "Signature expired."),
            Error::SignatureInvalid => write!(f, "Signature invalid."),
            Error::JWTInvalid => write!(f, "JWT invalid."),
            Error::IssuerInvalid => write!(f, "Issuer invalid."),
            Error::ExpirationInvalid => write!(f, "Expiration invalid."),
            Error::AudienceInvalid => write!(f, "Audience invalid."),
            Error::FormatInvalid(msg) => write!(f, "Format invalid: {}.", msg),
            Error::IoError(msg) => write!(f, "IO error: {}.", msg),
            Error::OpenSslError(msg) => write!(f, "Open SSL error: {}.", msg),
            Error::ProtocolError(msg) => write!(f, "Protocol error: {}.", msg),
        }
    }
}

impl error::Error for Error {}

impl_error!{IoError, Error::IoError}
impl_error!{SJError, Error::FormatInvalid}
impl_error!{ErrorStack, Error::OpenSslError}
impl_error!{B64Error, Error::ProtocolError}