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use roxmltree::{Node, TextPos};
use std::{error::Error, fmt};

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct PosError {
    position: TextPos,
}

impl fmt::Display for PosError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        // Todo: 331 is currently where the kanjidic contents start,
        // should make this dynamic
        write!(
            f,
            "Location {}:{}",
            self.position.row + 331,
            self.position.col
        )
    }
}

impl Error for PosError {}

impl<'a, 'input> From<&Node<'a, 'input>> for PosError {
    fn from(node: &Node<'a, 'input>) -> Self {
        let position = node.document().text_pos_at(node.range().start);
        Self { position }
    }
}