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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)
    }
}