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// Copyright 2018 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 or MIT license, at your option.
//
// A copy of the Apache License, Version 2.0 is included in the software as
// LICENSE-APACHE and a copy of the MIT license is included in the software
// as LICENSE-MIT. You may also obtain a copy of the Apache License, Version 2.0
// at https://www.apache.org/licenses/LICENSE-2.0 and a copy of the MIT license
// at https://opensource.org/licenses/MIT.

use std::{fmt, io};
use tokio_executor::SpawnError;

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

#[derive(Debug)]
pub enum Error {
    Io(io::Error),
    Exec(SpawnError),
    NoCapacity,
    TimerError,

    #[doc(hidden)]
    __Nonexhaustive
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Error::Io(e) => write!(f, "i/o error: {}", e),
            Error::Exec(e) => write!(f, "spawn error: {}", e),
            Error::NoCapacity => f.write_str("no capacity left"),
            Error::TimerError => f.write_str("error executing background timer"),
            Error::__Nonexhaustive => f.write_str("__Nonexhaustive")
        }
    }
}

impl std::error::Error for Error {
    fn cause(&self) -> Option<&dyn std::error::Error> {
        match self {
            Error::Io(e) => Some(e),
            Error::Exec(e) => Some(e),
            _ => None
        }
    }
}


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

impl From<SpawnError> for Error {
    fn from(e: SpawnError) -> Self {
        Error::Exec(e)
    }
}