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use crate::transaction::TransactionError;
use std::error;
use std::fmt;
use std::io;

#[derive(Debug)]
pub enum TransportError {
    IoError(io::Error),
    TransactionError(TransactionError),
}

impl error::Error for TransportError {}
impl fmt::Display for TransportError {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        match self {
            TransportError::IoError(err) => write!(formatter, "{:?}", err),
            TransportError::TransactionError(err) => write!(formatter, "{:?}", err),
        }
    }
}

impl TransportError {
    pub fn unwrap(&self) -> TransactionError {
        if let TransportError::TransactionError(err) = self {
            err.clone()
        } else {
            panic!("unexpected transport error")
        }
    }
}

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

impl From<TransactionError> for TransportError {
    fn from(err: TransactionError) -> TransportError {
        TransportError::TransactionError(err)
    }
}

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