auradb 0.1.0

//! Metrics module for performance measurement
//! 
//! This module will implement histogram and counter collection.
//! 
//! Planned for M2 milestone.

use crate::error::{Error, Result};

/// Metrics collector
pub struct MetricsCollector {
    // TODO: Implement metrics functionality
}

impl MetricsCollector {
    /// Create a new metrics collector
    pub fn new() -> Self {
        Self {}
    }
    
    /// Record histogram value
    pub fn record_histogram(&mut self, _name: &str, _value: f64) -> Result<()> {
        // TODO: Implement
        Ok(())
    }
    
    /// Increment counter
    pub fn increment_counter(&mut self, _name: &str) -> Result<()> {
        // TODO: Implement
        Ok(())
    }
    
    /// Get metrics snapshot
    pub fn snapshot(&self) -> MetricsSnapshot {
        // TODO: Implement
        MetricsSnapshot::default()
    }
}

/// Metrics snapshot
#[derive(Debug, Clone, Default)]
pub struct MetricsSnapshot {
    /// Histograms
    pub histograms: Vec<HistogramMetric>,
    /// Counters
    pub counters: Vec<CounterMetric>,
}

/// Histogram metric
#[derive(Debug, Clone)]
pub struct HistogramMetric {
    /// Metric name
    pub name: String,
    /// Count
    pub count: u64,
    /// Sum
    pub sum: f64,
    /// Min value
    pub min: f64,
    /// Max value
    pub max: f64,
}

/// Counter metric
#[derive(Debug, Clone)]
pub struct CounterMetric {
    /// Metric name
    pub name: String,
    /// Value
    pub value: u64,
}

#[cfg(test)]
mod tests {
    use super::*;
    
    #[test]
    fn test_metrics_collector_creation() {
        let collector = MetricsCollector::new();
        let snapshot = collector.snapshot();
        assert!(snapshot.histograms.is_empty());
    }
}