use std::error::Error;
use std::fmt;
use redis::RedisError;
use config::ConfigError;

pub type LJResult<T> = Result<T, Box<dyn std::error::Error>>;

#[derive(Debug)]
pub enum LJError {
    Config(ConfigError),
    RedisConnect(RedisError),
    HeliosDeviceMissing
}

impl fmt::Display for LJError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
	use LJError::*;
	
	match self {
	    Config(err) => {
		write!(f, "unable to load config file: {err}")
	    },

	    RedisConnect(err) => {
		write!(f, "unable to connect to redis server: {err}")
	    },
	    HeliosDeviceMissing => {
		write!(f, "helios device not found")
	    }
	}
    }
}

impl Error for LJError {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
	use LJError::*;

	match self {
	    RedisConnect(err) => Some(err),
	    _ => None
	}
    }
}