use crate::{
    N_INF,
    factor::{Factor, VarId, VarStore},
    gaussian::Gaussian,
};

#[derive(Debug)]
pub(crate) struct TruncFactor {
    pub(crate) diff: VarId,
    pub(crate) margin: f64,
    pub(crate) tie: bool,
    pub(crate) msg: Gaussian,
    pub(crate) evidence_cached: Option<f64>,
}

impl TruncFactor {
    pub(crate) fn new(diff: VarId, margin: f64, tie: bool) -> Self {
        Self {
            diff,
            margin,
            tie,
            msg: N_INF,
            evidence_cached: None,
        }
    }
}

impl Factor for TruncFactor {
    fn propagate(&mut self, _vars: &mut VarStore) -> (f64, f64) {
        unimplemented!("TruncFactor stub — implemented in Task 6")
    }
}