use std::{
    error,
    fmt,
};

#[derive(Debug)]
pub enum Error
{
    RNG,
    Format(fmt::Error),
    Unknown,
}

impl error::Error for Error
{
    fn source(&self) -> Option<&(dyn error::Error + 'static)>
    {
	match &self {
	    Self::Format(rng) => Some(rng),
	    _ => None,
	}
    }
}
impl fmt::Display for Error
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
    {
	write!(f, "temp file error: ")?;
	match self
	{
	    Error::RNG => write!(f, "rng failed"),
	    Error::Format(fmt) => write!(f, "formatting: {}", fmt),
	    _ => write!(f, "unknown"),
	}
    }
}

impl From<fmt::Error> for Error
{
    fn from(f: fmt::Error) -> Self
    {
	Self::Format(f)
    }
}
impl From<getrandom::Error> for Error
{
    fn from(_f: getrandom::Error) -> Self
    {
	Self::RNG
    }
}