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use failure::{Backtrace, Context, Fail};
use std::fmt;
use {serialport, };
use base::ErrorCode;

#[derive(Debug)]
pub struct Error {
    inner: Context<ErrorKind>,
}

impl Fail for Error {
    fn cause(&self) -> Option<&Fail> {
        self.inner.cause()
    }

    fn backtrace(&self) -> Option<&Backtrace> {
        self.inner.backtrace()
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.inner, f)
    }
}

impl Error {
    pub fn kind(&self) -> ErrorKind {
        *self.inner.get_context()
    }
}

impl From<ErrorKind> for Error {
    fn from(kind: ErrorKind) -> Error {
        Error {
            inner: Context::new(kind),
        }
    }
}

impl From<Context<ErrorKind>> for Error {
    fn from(inner: Context<ErrorKind>) -> Error {
        Error { inner }
    }
}

#[derive(Copy, Clone, Eq, PartialEq, Debug, Fail)]
pub enum ErrorKind {
    #[fail(display = "timeout")]
    Timeout,
    #[fail(display = "channel receiver disconnected")]
    ChannelReceiverDisconnected,
    #[fail(display = "thread creation error")]
    ThreadCreation,
    #[fail(display = "serial port error")]
    SerialPort,
    #[fail(display = "unexpected response type")]
    UnexpectedResponseType,
    #[fail(display = "programmer error")]
    ProgrammerError,
    #[fail(display = "xio error {:#x} ({:?})", _0, _0)]
    Xio(ErrorCode),
}

impl From<serialport::Error> for Error {
    fn from(e: serialport::Error) -> Error {
        e.context(ErrorKind::SerialPort).into()
    }
}

impl From<ErrorCode> for Error {
    fn from(c: ErrorCode) -> Error {
        ErrorKind::Xio(c).into()
    }
}