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use std::{error, fmt};

use crate::Signature;

#[derive(Debug)]
pub enum VariantError {
    ExcessData,
    IncorrectType,
    IncorrectValue,
    InvalidUtf8,
    InsufficientData,
    UnsupportedType(Signature),
}

impl error::Error for VariantError {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        None
    }
}

impl fmt::Display for VariantError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            VariantError::ExcessData => write!(f, "excess data"),
            VariantError::IncorrectType => write!(f, "incorrect type"),
            VariantError::IncorrectValue => write!(f, "incorrect value"),
            VariantError::InvalidUtf8 => write!(f, "invalid UTF-8"),
            VariantError::InsufficientData => write!(f, "insufficient data"),
            VariantError::UnsupportedType(s) => {
                write!(f, "unsupported type (signature: \"{}\")", s.as_str())
            }
        }
    }
}