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

use crate::position::*;

#[derive(Debug)]
pub struct CrimError {
    position: Position,
    what: String,
}

impl CrimError {
    pub fn parse( position: Position, what: String ) -> Self {
        Self {
            position,
            what,
        }
    }

    pub fn other(what: String) -> Self {
        Self {
            position: Position::none(),
            what,
        }
    }

    pub fn eos( context: &str ) -> Self {
        Self {
            position: Position::none(),
            what: format!("Premature end of stream while looking for {}", context),
        }
    }

    pub fn what(&self) -> &str {
        &self.what
    }

    pub fn start(&self) -> &Position {
        &self.position
    }
}

impl fmt::Display for CrimError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "Error parsing input: {}", "yeah")
    }
}

impl Error for CrimError { }

pub type CrimResult<T> = Result<T, CrimError>;