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// The MIT License (MIT)
//
// Copyright (c) 2018 Michael Dilger
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

use std::fmt;

#[derive(Debug)]
pub enum Error {
    Fmt(fmt::Error),
    Io(std::io::Error),
    General(String),
    BadMagicNumber,
    InvalidField(String),
    ShortFile,
    UnsupportedFormat,
    OutOfBounds,
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Error::Fmt(ref e) => write!(f, "{}", e),
            Error::Io(ref e) => write!(f, "{}", e),
            Error::General(ref s) => write!(f, "General Error: {}", s),
            Error::BadMagicNumber => write!(f, "Bad Magic Number"),
            Error::InvalidField(ref s) => write!(f, "Invalid Field: {}", s),
            Error::ShortFile => write!(f, "File is cut short"),
            Error::UnsupportedFormat => write!(f, "Format is not supported well enough for this operation"),
            Error::OutOfBounds => write!(f, "Request is out of bounds"),
        }
    }
}

impl std::error::Error for Error {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match *self {
            Error::Fmt(ref e) => Some(e),
            Error::Io(ref e) => Some(e),
            _ => None,
        }
    }
}

impl From<fmt::Error> for Error {
    fn from(e: fmt::Error) -> Error {
        Error::Fmt(e)
    }
}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Error {
        Error::Io(e)
    }
}

impl From<&str> for Error {
    fn from(s: &str) -> Error {
        Error::General(s.to_owned())
    }
}

impl From<String> for Error {
    fn from(s: String) -> Error {
        Error::General(s)
    }
}