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use std::io;

use byteorder;
use lzma;

/// The error type used by swf-headers.
///
/// Anything that could be considered a malformed or corrupt SWF falls into
/// the broad category of NotSwf, along with everything else that can't be a
/// SWF file. This may change in the future
///
/// Implementations of From for a couple of error types are done to make
/// using try!() around the place more convenient.
#[derive(Debug)]
pub enum Error {
    /// Any IO error, either from directly reading files or from other libraries.
    IoError(io::Error),
    /// All-encompassing variant for anything that can't be a swf file.
    NotSwf
}

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

impl From<byteorder::Error> for Error {
    fn from(err: byteorder::Error) -> Self {
        use byteorder::Error::*;
        match err {
            UnexpectedEOF => Error::NotSwf,
            Io(error) => error.into()
        }
    }
}

impl From<lzma::Error> for Error {
    fn from(err: lzma::Error) -> Self {
        use lzma::Error::*;
        match err {
            IO(error) => error.into(),
            ByteOrder(error) => error.into(),
            _ => Error::NotSwf
        }
    }
}