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//! Contains error type for handling I/O and Errno errors
#[cfg(windows)]
use std::char;
use std::error::Error;
use std::fmt;
use std::io;

/// The error type for Rustyline errors that can arise from
/// I/O related errors or Errno when using the nix-rust library
// #[non_exhaustive]
#[allow(clippy::module_name_repetitions)]
#[derive(Debug)]
#[non_exhaustive]
pub enum ReadlineError {
    /// I/O Error
    Io(io::Error),
    /// EOF (VEOF / Ctrl-D)
    Eof,
    /// Interrupt signal (VINTR / VQUIT / Ctrl-C)
    Interrupted,
    /// Unix Error from syscall
    #[cfg(unix)]
    Errno(nix::Error),
    /// Error generated on WINDOW_BUFFER_SIZE_EVENT / SIGWINCH signal
    WindowResized,
    /// Like Utf8Error on unix
    #[cfg(windows)]
    Decode(char::DecodeUtf16Error),
    /// Something went wrong calling a Windows API
    #[cfg(windows)]
    SystemError(clipboard_win::SystemError),
}

impl fmt::Display for ReadlineError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match *self {
            ReadlineError::Io(ref err) => err.fmt(f),
            ReadlineError::Eof => write!(f, "EOF"),
            ReadlineError::Interrupted => write!(f, "Interrupted"),
            #[cfg(unix)]
            ReadlineError::Errno(ref err) => err.fmt(f),
            ReadlineError::WindowResized => write!(f, "WindowResized"),
            #[cfg(windows)]
            ReadlineError::Decode(ref err) => err.fmt(f),
            #[cfg(windows)]
            ReadlineError::SystemError(ref err) => err.fmt(f),
        }
    }
}

impl Error for ReadlineError {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        match *self {
            ReadlineError::Io(ref err) => Some(err),
            ReadlineError::Eof => None,
            ReadlineError::Interrupted => None,
            #[cfg(unix)]
            ReadlineError::Errno(ref err) => Some(err),
            ReadlineError::WindowResized => None,
            #[cfg(windows)]
            ReadlineError::Decode(ref err) => Some(err),
            #[cfg(windows)]
            ReadlineError::SystemError(_) => None,
        }
    }
}

#[cfg(unix)]
#[derive(Debug)]
pub(crate) struct WindowResizedError;
#[cfg(unix)]
impl fmt::Display for WindowResizedError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "WindowResized")
    }
}
#[cfg(unix)]
impl Error for WindowResizedError {}

impl From<io::Error> for ReadlineError {
    fn from(err: io::Error) -> Self {
        #[cfg(unix)]
        if err.kind() == io::ErrorKind::Interrupted {
            if let Some(e) = err.get_ref() {
                if e.downcast_ref::<WindowResizedError>().is_some() {
                    return ReadlineError::WindowResized;
                }
            }
        }
        ReadlineError::Io(err)
    }
}

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

#[cfg(unix)]
impl From<nix::Error> for ReadlineError {
    fn from(err: nix::Error) -> Self {
        ReadlineError::Errno(err)
    }
}

#[cfg(windows)]
impl From<char::DecodeUtf16Error> for ReadlineError {
    fn from(err: char::DecodeUtf16Error) -> Self {
        ReadlineError::Io(io::Error::new(io::ErrorKind::InvalidData, err))
    }
}

#[cfg(windows)]
impl From<std::string::FromUtf8Error> for ReadlineError {
    fn from(err: std::string::FromUtf8Error) -> Self {
        ReadlineError::Io(io::Error::new(io::ErrorKind::InvalidData, err))
    }
}

#[cfg(unix)]
impl From<fmt::Error> for ReadlineError {
    fn from(err: fmt::Error) -> Self {
        ReadlineError::Io(io::Error::new(io::ErrorKind::Other, err))
    }
}

#[cfg(windows)]
impl From<clipboard_win::SystemError> for ReadlineError {
    fn from(err: clipboard_win::SystemError) -> Self {
        ReadlineError::SystemError(err)
    }
}