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use std::any::Any;
use std::fmt;
use std::io;

/// Task failed to execute to completion.
pub struct JoinError {
    repr: Repr,
}

enum Repr {
    Cancelled,
    Panic(Box<dyn Any + Send + 'static>),
}

impl JoinError {
    /// Create a new `cancelled` error
    pub fn cancelled() -> JoinError {
        JoinError {
            repr: Repr::Cancelled,
        }
    }

    /// Create a new `panic` error
    pub fn panic(err: Box<dyn Any + Send + 'static>) -> JoinError {
        JoinError {
            repr: Repr::Panic(err),
        }
    }
}

impl fmt::Display for JoinError {
    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.repr {
            Repr::Cancelled => write!(fmt, "cancelled"),
            Repr::Panic(_) => write!(fmt, "panic"),
        }
    }
}

impl fmt::Debug for JoinError {
    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.repr {
            Repr::Cancelled => write!(fmt, "JoinError::Cancelled"),
            Repr::Panic(_) => write!(fmt, "JoinError::Panic(...)"),
        }
    }
}

impl std::error::Error for JoinError {}

impl From<JoinError> for io::Error {
    fn from(src: JoinError) -> io::Error {
        io::Error::new(
            io::ErrorKind::Other,
            match src.repr {
                Repr::Cancelled => "task was cancelled",
                Repr::Panic(_) => "task panicked",
            },
        )
    }
}