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


#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum ErrorCategory
{
    InputData,
    InputDataFormat
}

pub type Result<T> = core::result::Result<T, Error>;

pub struct Error {
    inner_error: Box<InnerError>,
}

impl Error
{
    pub fn categorize(&self) -> ErrorCategory
    {
        match self.inner_error.code
        {
            ErrorCode::InvalidArgument => ErrorCategory::InputData,
            ErrorCode::InvalidArgumentFormat => ErrorCategory::InputDataFormat,
        }
    }
}

#[allow(dead_code)]
pub(crate) enum ErrorCode {
    InvalidArgument,
    InvalidArgumentFormat,
}

impl ErrorCode {
    pub fn description(&self) -> &'static str {
        match self {
            ErrorCode::InvalidArgument => "Invalid value for argument",
            ErrorCode::InvalidArgumentFormat => "Invalid argument format.",
        }
    }
}


struct InnerError
{
    code: ErrorCode,
    target: String,
}

impl Error
{
    pub(crate) fn new(code: ErrorCode, target: impl Into<String>) -> Self {
        Self{ inner_error: Box::new(InnerError { code: code, target: target.into() }),}
    }
}


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

}

impl fmt::Debug for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result 
    {
        fmt::Display::fmt(&*self, f)
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result 
    {
        write!(f, "{}  target {}",self.inner_error.code.description(), self.inner_error.target)
    }
}