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/*
Copyright 2019 ETCDEV GmbH

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.
*/
//! # Serialize keystore files (UTC / JSON) module errors

use crate::hdwallet;
use serde_json;

use std::{error, fmt, io};

/// Keystore file serialize errors
#[derive(Debug)]
pub enum Error {
    /// An unsupported version
    UnsupportedVersion(u8),

    /// IO errors
    IO(io::Error),

    /// Invalid `Keyfile` decoding
    InvalidDecoding(serde_json::Error),

    /// Invalid `Keyfile` encoding
    InvalidEncoding(serde_json::Error),

    /// `KeyFile` wasn't found
    NotFound,

    /// `Keyfile` crypto section parsing
    InvalidCrypto(String),
}

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

impl From<serde_json::Error> for Error {
    fn from(err: serde_json::Error) -> Self {
        Error::InvalidEncoding(err)
    }
}

//impl From<serde_json::Error> for Error {
//    fn from(err: serde_json::Error) -> Self {
//        Error::InvalidDecoding(err)
//    }
//}

impl From<hdwallet::Error> for Error {
    fn from(err: hdwallet::Error) -> Self {
        Error::InvalidCrypto(err.to_string())
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::UnsupportedVersion(v) => write!(f, "Unsupported keystore file version: {}", v),
            Error::IO(ref err) => write!(f, "Keystore file IO error: {}", err),
            Error::InvalidDecoding(ref err) => write!(f, "Invalid keystore file decoding: {}", err),
            Error::InvalidEncoding(ref err) => write!(f, "Invalid keystore file encoding: {}", err),
            Error::NotFound => f.write_str("Required keystore file wasn't found"),
            Error::InvalidCrypto(ref str) => {
                f.write_str(&format!("Can't parse `crypto` section for. {}", str))
            }
        }
    }
}

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

    fn cause(&self) -> Option<&error::Error> {
        match *self {
            _ => None,
        }
    }
}