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use super::rules::*;
use super::terms::*;
use serde::{Deserialize, Serialize};
use std::rc::Rc;
use std::sync::Arc;

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub enum Node {
    Rule(Arc<Rule>),
    Term(Term),
}

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct Trace {
    pub node: Node,
    pub children: Vec<Rc<Trace>>,
}

impl Trace {
    pub fn term(&self) -> Option<Term> {
        if let Node::Term(t) = &self.node {
            Some(t.clone())
        } else {
            None
        }
    }
}

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct TraceResult {
    pub trace: Rc<Trace>,
    pub formatted: String,
}