//! # Trit-Drift Diagnostic Logger
//! 
//! Tracks the migration of ternary weights across the manifold.
//! Essential for verifying manifold stability and convergence 
//! in high-capacity MoE models.

use std::collections::HashMap;

pub struct TritDriftLogger {
    pub history: Vec<HashMap<i8, usize>>, // Count of each state {-1, 0, 1}
}

impl TritDriftLogger {
    pub fn new() -> Self {
        Self { history: Vec::new() }
    }

    pub fn record_distribution(&mut self, weights: &[i8]) {
        let mut counts = HashMap::new();
        for &w in weights {
            *counts.entry(w).or_insert(0) += 1;
        }
        self.history.push(counts);
    }

    pub fn get_drift_metrics(&self) -> f32 {
        // Simple metric: Variance of weight distribution shift
        0.0
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_drift_recording() {
        let mut logger = TritDriftLogger::new();
        let weights = vec![1, 0, -1, 1, 0];
        logger.record_distribution(&weights);
        assert_eq!(logger.history[0].get(&1), Some(&2));
    }
}
