rmpca 0.1.0

//! Optimizer module containing the route optimization engine
//!
//! This module provides the core optimization algorithms and data structures
//! for solving the Chinese Postman Problem and finding Eulerian circuits
//! in road networks.

pub mod ffi;
pub mod types;


pub use types::{Node, Way, OptimizationResult, RoutePoint, RouteStats};

/// Main optimizer using ported offline-optimizer-v2 algorithm
///
/// This struct provides the entry point for route optimization,
/// combining graph construction, Eulerian balancing, and circuit finding.
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct RouteOptimizer {
    nodes: Vec<Node>,
    ways: Vec<Way>,
}

impl RouteOptimizer {
    /// Create a new optimizer instance
    pub fn new() -> Self {
        Self {
            nodes: Vec::new(),
            ways: Vec::new(),
        }
    }

    /// Build graph from GeoJSON features
    pub fn build_graph_from_features(&mut self, _features: &[geojson::Feature]) -> anyhow::Result<()> {
        // TODO: Implement graph construction from GeoJSON features
        // This will involve:
        // 1. Parsing LineString geometries
        // 2. Creating nodes from coordinates
        // 3. Creating edges for road segments
        // 4. Handling one-way streets
        Ok(())
    }

    /// Optimize route from input GeoJSON
    pub fn optimize(&mut self) -> anyhow::Result<OptimizationResult> {
        // TODO: Implement full optimization flow:
        // 1. Build graph from input
        // 2. Make graph Eulerian
        // 3. Find Eulerian circuit
        // 4. Eliminate U-turns
        // 5. Return result
        Ok(OptimizationResult::new(vec![], 0.0))
    }

    /// Set turn penalties for optimization
    pub fn set_turn_penalties(&mut self, _left: f64, _right: f64, _u: f64) {
        // TODO: Implement turn penalty configuration
    }

    /// Set depot location for optimization
    pub fn set_depot(&mut self, _lat: f64, _lon: f64) {
        // TODO: Implement depot configuration
    }

    /// Get optimizer statistics
    pub fn get_stats(&self) -> OptimizerStats {
        OptimizerStats {
            node_count: self.nodes.len(),
            edge_count: self.ways.len(),
            component_count: 0, // TODO: Calculate
            avg_degree: if self.nodes.is_empty() {
                0.0
            } else {
                (self.ways.len() as f64) / (self.nodes.len() as f64)
            },
            max_degree: 0, // TODO: Calculate
        }
    }

    /// Check if all nodes have even degree (Eulerian condition)
    pub fn all_nodes_have_even_degree(&self) -> bool {
        // TODO: Implement degree calculation
        true
    }
}

impl Default for RouteOptimizer {
    fn default() -> Self {
        Self::new()
    }
}

/// Statistics about the optimizer graph
#[derive(Debug, Clone)]
pub struct OptimizerStats {
    pub node_count: usize,
    pub edge_count: usize,
    pub component_count: usize,
    pub avg_degree: f64,
    pub max_degree: usize,
}

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

    #[test]
    fn test_optimizer_creation() {
        let optimizer = RouteOptimizer::new();
        assert_eq!(optimizer.nodes.len(), 0);
        assert_eq!(optimizer.ways.len(), 0);
    }

    #[test]
    fn test_optimizer_default() {
        let optimizer = RouteOptimizer::default();
        assert_eq!(optimizer.nodes.len(), 0);
        assert_eq!(optimizer.ways.len(), 0);
    }

    #[test]
    fn test_optimizer_stats() {
        let mut optimizer = RouteOptimizer::new();
        optimizer.nodes.push(Node::new("node1", 45.5, -73.6));
        optimizer.nodes.push(Node::new("node2", 45.51, -73.61));
        optimizer.ways.push(Way::new("way1", vec!["node1".to_string()]));

        let stats = optimizer.get_stats();
        assert_eq!(stats.node_count, 2);
        assert_eq!(stats.edge_count, 1);
        assert!(stats.avg_degree > 0.0);
    }
}