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use crate::linter::{Rule, RuleResult};
use sv_parser::{NodeEvent, RefNode, SyntaxTree, WhiteSpace};

#[derive(Default)]
pub struct TabCharacter;

impl Rule for TabCharacter {
    fn check(&mut self, syntax_tree: &SyntaxTree, event: &NodeEvent) -> RuleResult {
        let node = match event {
            NodeEvent::Enter(x) => x,
            NodeEvent::Leave(_) => {
                return RuleResult::Pass;
            }
        };
        match node {
            RefNode::WhiteSpace(WhiteSpace::Space(x)) => {
                let text = syntax_tree.get_str(x).unwrap();
                match text.find('\t') {
                    Some(x) => RuleResult::FailAt(x, 1),
                    None => RuleResult::Pass,
                }
            }
            _ => RuleResult::Pass,
        }
    }

    fn name(&self) -> String {
        String::from("tab_character")
    }

    fn hint(&self) -> String {
        String::from("tab character is forbidden")
    }

    fn reason(&self) -> String {
        String::from("may cause misalignment depending on editor setting")
    }
}