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use std::error::Error;
use std::fmt;

use super::part::PartError;

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

/// The enum `TexelError` defines the possible errors
/// from constructor Texel.
#[derive(Clone, Debug)]
pub enum TexelError {
    PartFail(PartError),
    ForbiddenGlyph(char),
}

impl fmt::Display for TexelError {
    /// The function `fmt` formats the value using
    /// the given formatter.
    fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
        Ok(())
    }
}

impl Error for TexelError {
    /// The function `description` returns a short description of
    /// the error.
    fn description(&self) -> &str {
        match *self {
            TexelError::PartFail(_) => "The part constructor as occured an error.",
            TexelError::ForbiddenGlyph(_) => "Is out of the private unicode range.",
        }
    }

    /// The function `cause` returns the lower-level cause of
    /// this error if any.
    fn cause(&self) -> Option<&Error> {
        match *self {
            TexelError::PartFail(ref err) => Some(err),
            _ => None,
        }
    }
}