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/*
 Copyright 2016 LambdaStack All rights reserved.

 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::error;
use std::io;
use std::fmt;
use std::result;
use std::str;
use std::string;
use rustc_serialize::json;

pub type Result<T> = result::Result<T, Error>;

#[derive(Debug)]
pub enum Error {
    CryptoKeyError(String),
    FileNameError,
    InvalidTomlError(String),
    /// Occurs when making lower level IO calls.
    IO(io::Error),
    JsonDecode(json::DecoderError),
    JsonEncode(json::EncoderError),
    StrFromUtf8Error(str::Utf8Error),
    StringFromUtf8Error(string::FromUtf8Error),
    WireDecode(String),
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let msg = match *self {
            Error::CryptoKeyError(ref s) => format!("Missing or invalid key: {}", s),
            Error::FileNameError => format!("Failed to extract a filename"),
            Error::InvalidTomlError(ref e) => format!("Invalid TOML: {}", e),
            Error::IO(ref err) => format!("{}", err),
            Error::JsonDecode(ref e) => format!("JSON decoding error: {}", e),
            Error::JsonEncode(ref e) => format!("JSON encoding error: {}", e),
            Error::StrFromUtf8Error(ref e) => format!("{}", e),
            Error::StringFromUtf8Error(ref e) => format!("{}", e),
            Error::WireDecode(ref m) => format!("Failed to decode wire message: {}", m),
        };
        write!(f, "{}", msg)
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        match *self {
            Error::CryptoKeyError(_) => "Missing or invalid key",
            Error::FileNameError => "Failed to extract a filename from a path",
            Error::InvalidTomlError(_) => "Invalid TOML",
            Error::IO(ref err) => err.description(),
            Error::JsonDecode(_) => "JSON decoding error: {:?}",
            Error::JsonEncode(_) => "JSON encoding error",
            Error::StrFromUtf8Error(_) => "Failed to convert a string as UTF-8",
            Error::StringFromUtf8Error(_) => "Failed to convert a string as UTF-8",
            Error::WireDecode(_) => "Failed to decode wire message",
        }
    }
}

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

impl From<json::DecoderError> for Error {
    fn from(err: json::DecoderError) -> Self {
        Error::JsonDecode(err)
    }
}

impl From<json::EncoderError> for Error {
    fn from(err: json::EncoderError) -> Self {
        Error::JsonEncode(err)
    }
}

impl From<str::Utf8Error> for Error {
    fn from(err: str::Utf8Error) -> Self {
        Error::StrFromUtf8Error(err)
    }
}

impl From<string::FromUtf8Error> for Error {
    fn from(err: string::FromUtf8Error) -> Self {
        Error::StringFromUtf8Error(err)
    }
}