//! Trait Explorer Core Framework
//!
//! Core configuration, main explorer orchestration, and result management
//! for the comprehensive trait exploration system in sklears-core.
//!
//! This module provides the foundational components for trait exploration:
//! - Configuration system with builder pattern
//! - Main TraitExplorer coordination framework
//! - Result structures and aggregation
//! - Core utility functions and integration interfaces
//!
//! # Example Usage
//!
//! ```rust,ignore
//! use sklears_core::trait_explorer::trait_explorer_core::{TraitExplorer, ExplorerConfig};
//!
//! # fn main() -> Result<(), Box<dyn std::error::Error>> {
//! let config = ExplorerConfig::new()
//!     .with_interactive_mode(true)
//!     .with_performance_analysis(true)
//!     .with_visual_graph(true)
//!     .with_max_depth(8);
//!
//! let mut explorer = TraitExplorer::new(config);
//! explorer.load_from_crate("sklears-core")?;
//!
//! let analysis = explorer.explore_trait("Estimator")?;
//! println!("Trait: {}", analysis.trait_name);
//! println!("Complexity score: {}", analysis.complexity_score);
//! # Ok(())
//! # }
//! ```

use crate::api_data_structures::{AssociatedType, MethodInfo, TraitInfo};
use crate::error::{Result, SklearsError};

// SciRS2 Core Dependencies - Full compliance
// Note: scirs2_core::error::Result doesn't exist, using crate::error::Result instead

use serde::{Deserialize, Serialize};
use std::collections::{HashMap, HashSet};
use std::path::PathBuf;
use std::time::{Duration, Instant};

/// Configuration for the trait explorer with comprehensive options
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExplorerConfig {
    /// Enable interactive mode with user input
    pub interactive_mode: bool,
    /// Include performance analysis of implementations
    pub performance_analysis: bool,
    /// Generate visual graphs of trait relationships
    pub visual_graph: bool,
    /// Maximum depth for trait hierarchy exploration
    pub max_depth: usize,
    /// Include implementation complexity analysis
    pub complexity_analysis: bool,
    /// Generate usage examples
    pub generate_examples: bool,
    /// Output directory for generated files
    pub output_dir: Option<PathBuf>,
    /// Export format for graphs and visualizations
    pub export_format: GraphExportFormat,
    /// Enable parallel analysis where possible
    pub parallel_analysis: bool,
    /// Include security analysis
    pub security_analysis: bool,
    /// Include cross-platform compatibility analysis
    pub cross_platform_analysis: bool,
    /// Cache analysis results
    pub enable_caching: bool,
    /// Verbose output mode
    pub verbose: bool,
}

impl ExplorerConfig {
    /// Create a new explorer configuration with default settings
    pub fn new() -> Self {
        Self {
            interactive_mode: false,
            performance_analysis: true,
            visual_graph: true,
            max_depth: 10,
            complexity_analysis: true,
            generate_examples: true,
            output_dir: None,
            export_format: GraphExportFormat::Svg,
            parallel_analysis: true,
            security_analysis: false,
            cross_platform_analysis: false,
            enable_caching: true,
            verbose: false,
        }
    }

    /// Enable interactive mode
    pub fn with_interactive_mode(mut self, enabled: bool) -> Self {
        self.interactive_mode = enabled;
        self
    }

    /// Enable performance analysis
    pub fn with_performance_analysis(mut self, enabled: bool) -> Self {
        self.performance_analysis = enabled;
        self
    }

    /// Enable visual graph generation
    pub fn with_visual_graph(mut self, enabled: bool) -> Self {
        self.visual_graph = enabled;
        self
    }

    /// Set maximum exploration depth
    pub fn with_max_depth(mut self, depth: usize) -> Self {
        self.max_depth = depth;
        self
    }

    /// Enable complexity analysis
    pub fn with_complexity_analysis(mut self, enabled: bool) -> Self {
        self.complexity_analysis = enabled;
        self
    }

    /// Enable example generation
    pub fn with_generate_examples(mut self, enabled: bool) -> Self {
        self.generate_examples = enabled;
        self
    }

    /// Set output directory
    pub fn with_output_dir(mut self, dir: PathBuf) -> Self {
        self.output_dir = Some(dir);
        self
    }

    /// Set export format
    pub fn with_export_format(mut self, format: GraphExportFormat) -> Self {
        self.export_format = format;
        self
    }

    /// Enable parallel analysis
    pub fn with_parallel_analysis(mut self, enabled: bool) -> Self {
        self.parallel_analysis = enabled;
        self
    }

    /// Enable security analysis
    pub fn with_security_analysis(mut self, enabled: bool) -> Self {
        self.security_analysis = enabled;
        self
    }

    /// Enable cross-platform analysis
    pub fn with_cross_platform_analysis(mut self, enabled: bool) -> Self {
        self.cross_platform_analysis = enabled;
        self
    }

    /// Enable result caching
    pub fn with_caching(mut self, enabled: bool) -> Self {
        self.enable_caching = enabled;
        self
    }

    /// Enable verbose output
    pub fn with_verbose(mut self, enabled: bool) -> Self {
        self.verbose = enabled;
        self
    }

    /// Validate configuration settings
    pub fn validate(&self) -> Result<()> {
        if self.max_depth == 0 {
            return Err(SklearsError::InvalidInput(
                "max_depth must be greater than 0".to_string(),
            ));
        }

        if self.max_depth > 50 {
            return Err(SklearsError::InvalidInput(
                "max_depth should not exceed 50 for performance reasons".to_string(),
            ));
        }

        if let Some(ref output_dir) = self.output_dir {
            if !output_dir.exists() && output_dir.parent().is_some_and(|p| !p.exists()) {
                return Err(SklearsError::InvalidInput(format!(
                    "Output directory parent does not exist: {:?}",
                    output_dir
                )));
            }
        }

        Ok(())
    }
}

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

/// Export formats for graph visualizations
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum GraphExportFormat {
    /// SVG format for web display
    Svg,
    /// PNG format for images
    Png,
    /// DOT format for Graphviz
    Dot,
    /// JSON format for programmatic use
    Json,
    /// Interactive HTML with JavaScript
    InteractiveHtml,
    /// Mermaid diagram format
    Mermaid,
    /// PlantUML format
    PlantUml,
}

impl GraphExportFormat {
    pub fn file_extension(&self) -> &'static str {
        match self {
            Self::Svg => "svg",
            Self::Png => "png",
            Self::Dot => "dot",
            Self::Json => "json",
            Self::InteractiveHtml => "html",
            Self::Mermaid => "mmd",
            Self::PlantUml => "puml",
        }
    }

    /// Get MIME type for the format
    pub fn mime_type(&self) -> &'static str {
        match self {
            Self::Svg => "image/svg+xml",
            Self::Png => "image/png",
            Self::Dot => "text/vnd.graphviz",
            Self::Json => "application/json",
            Self::InteractiveHtml => "text/html",
            Self::Mermaid => "text/plain",
            Self::PlantUml => "text/plain",
        }
    }
}

/// Main trait explorer for analyzing trait relationships and usage
#[derive(Debug)]
pub struct TraitExplorer {
    config: ExplorerConfig,
    trait_registry: TraitRegistry,
    dependency_analyzer: DependencyAnalyzer,
    performance_analyzer: TraitPerformanceAnalyzer,
    graph_generator: TraitGraphGenerator,
    example_generator: ExampleGenerator,
    cache: Option<AnalysisCache>,
    metrics: ExplorationMetrics,
}

impl TraitExplorer {
    /// Create a new trait explorer with configuration
    pub fn new(config: ExplorerConfig) -> Result<Self> {
        config.validate()?;

        let cache = if config.enable_caching {
            Some(AnalysisCache::new())
        } else {
            None
        };

        Ok(Self {
            config: config.clone(),
            trait_registry: TraitRegistry::new(),
            dependency_analyzer: DependencyAnalyzer::new(),
            performance_analyzer: TraitPerformanceAnalyzer::new(),
            graph_generator: TraitGraphGenerator::new(config.clone()),
            example_generator: ExampleGenerator::new(),
            cache,
            metrics: ExplorationMetrics::new(),
        })
    }

    /// Load trait information from the current crate
    pub fn load_from_crate(&mut self, crate_name: &str) -> Result<()> {
        let start_time = Instant::now();

        // In a real implementation, this would use syn/quote to parse the crate
        // For now, populate with example sklears-core traits
        self.trait_registry.load_sklears_traits()?;

        self.metrics.record_load_time(start_time.elapsed());
        self.metrics.increment_crates_loaded();

        if self.config.verbose {
            println!("Loaded trait information from crate: {}", crate_name);
        }

        Ok(())
    }

    /// Explore a specific trait and its relationships
    pub fn explore_trait(&mut self, trait_name: &str) -> Result<TraitExplorationResult> {
        let start_time = Instant::now();

        // Check cache first
        if let Some(ref cache) = self.cache {
            if let Some(cached_result) = cache.get_trait_analysis(trait_name) {
                self.metrics.increment_cache_hits();
                return Ok(cached_result);
            }
        }

        let trait_info = self.trait_registry.get_trait(trait_name).ok_or_else(|| {
            SklearsError::InvalidInput(format!("Trait '{}' not found", trait_name))
        })?;

        let dependencies = if self.config.complexity_analysis {
            self.dependency_analyzer.analyze_dependencies(trait_info)?
        } else {
            DependencyAnalysis::default()
        };

        let performance = if self.config.performance_analysis {
            self.performance_analyzer
                .analyze_trait_performance(trait_info)?
        } else {
            PerformanceAnalysis::default()
        };

        let implementations = self.trait_registry.get_implementations(trait_name);

        let complexity_score = self.calculate_complexity_score(trait_info, &dependencies);

        let graph = if self.config.visual_graph {
            Some(
                self.graph_generator
                    .generate_trait_graph(trait_info, &implementations)?,
            )
        } else {
            None
        };

        let examples = if self.config.generate_examples {
            self.example_generator.generate_usage_examples(trait_info)?
        } else {
            Vec::new()
        };

        let related_traits = self.find_related_traits(trait_info)?;

        let result = TraitExplorationResult {
            trait_name: trait_name.to_string(),
            trait_info: trait_info.clone(),
            implementations,
            dependencies,
            performance,
            complexity_score,
            graph,
            examples,
            related_traits,
            exploration_metadata: ExplorationMetadata {
                timestamp: chrono::Utc::now(),
                duration: start_time.elapsed(),
                config_snapshot: self.config.clone(),
            },
        };

        // Cache the result
        if let Some(ref mut cache) = self.cache {
            cache.store_trait_analysis(trait_name, result.clone());
        }

        self.metrics.record_exploration_time(start_time.elapsed());
        self.metrics.increment_traits_explored();

        Ok(result)
    }

    /// Explore all traits in the registry
    pub fn explore_all_traits(&mut self) -> Result<Vec<TraitExplorationResult>> {
        let trait_names = self.trait_registry.get_all_trait_names();
        let mut results = Vec::new();

        for trait_name in trait_names {
            match self.explore_trait(&trait_name) {
                Ok(result) => {
                    results.push(result);
                    if self.config.verbose {
                        println!("Explored trait: {}", trait_name);
                    }
                }
                Err(e) => {
                    eprintln!("Failed to explore trait '{}': {}", trait_name, e);
                    self.metrics.increment_errors();
                }
            }
        }

        Ok(results)
    }

    /// Generate a comprehensive trait relationship graph
    pub fn generate_full_trait_graph(&self) -> Result<TraitGraph> {
        let all_traits = self.trait_registry.get_all_traits();
        self.graph_generator.generate_full_graph(&all_traits)
    }

    /// Find traits that are similar to a given trait
    pub fn find_similar_traits(
        &self,
        trait_name: &str,
        similarity_threshold: f64,
    ) -> Result<Vec<SimilarTrait>> {
        let target_trait = self.trait_registry.get_trait(trait_name).ok_or_else(|| {
            SklearsError::InvalidInput(format!("Trait '{}' not found", trait_name))
        })?;

        let all_traits = self.trait_registry.get_all_traits();
        let mut similar = Vec::new();

        for other_trait in &all_traits {
            if other_trait.name != target_trait.name {
                let similarity = self.calculate_trait_similarity(target_trait, other_trait);
                if similarity >= similarity_threshold {
                    similar.push(SimilarTrait {
                        name: other_trait.name.clone(),
                        similarity_score: similarity,
                        common_methods: self.find_common_methods(target_trait, other_trait),
                        difference_summary: self.summarize_differences(target_trait, other_trait),
                    });
                }
            }
        }

        similar.sort_by(|a, b| {
            b.similarity_score
                .partial_cmp(&a.similarity_score)
                .unwrap_or(std::cmp::Ordering::Equal)
        });
        Ok(similar)
    }

    /// Get exploration metrics
    pub fn get_metrics(&self) -> &ExplorationMetrics {
        &self.metrics
    }

    /// Clear analysis cache
    pub fn clear_cache(&mut self) {
        if let Some(ref mut cache) = self.cache {
            cache.clear();
        }
    }

    /// Get configuration
    pub fn config(&self) -> &ExplorerConfig {
        &self.config
    }

    /// Calculate complexity score for a trait
    pub fn calculate_complexity_score(
        &self,
        trait_info: &TraitInfo,
        dependencies: &DependencyAnalysis,
    ) -> f64 {
        let method_complexity = trait_info.methods.len() as f64 * 1.0;
        let associated_type_complexity = trait_info.associated_types.len() as f64 * 1.5;
        let generic_complexity = trait_info.generics.len() as f64 * 0.5;
        let dependency_complexity = dependencies.direct_dependencies.len() as f64 * 0.8;
        let supertraits_complexity = trait_info.supertraits.len() as f64 * 1.2;

        let base_complexity = method_complexity
            + associated_type_complexity
            + generic_complexity
            + dependency_complexity
            + supertraits_complexity;

        // Apply modifiers
        let mut total_complexity = base_complexity;

        // Penalty for deep dependency chains
        if dependencies.dependency_depth > 5 {
            total_complexity *= 1.1 + (dependencies.dependency_depth - 5) as f64 * 0.05;
        }

        // Penalty for circular dependencies
        if !dependencies.circular_dependencies.is_empty() {
            total_complexity *= 1.3;
        }

        total_complexity
    }

    /// Find traits related to a given trait
    fn find_related_traits(&self, trait_info: &TraitInfo) -> Result<Vec<String>> {
        let mut related = HashSet::new();

        // Add supertraits
        for supertrait in &trait_info.supertraits {
            related.insert(supertrait.clone());
        }

        // Add traits that have this trait as a supertrait
        let all_traits = self.trait_registry.get_all_traits();
        for other_trait in &all_traits {
            if other_trait.supertraits.contains(&trait_info.name) {
                related.insert(other_trait.name.clone());
            }
        }

        // Add traits that share implementations
        for implementation in &trait_info.implementations {
            let impl_traits = self
                .trait_registry
                .get_traits_for_implementation(implementation);
            related.extend(impl_traits);
        }

        related.remove(&trait_info.name); // Remove self
        Ok(related.into_iter().collect())
    }

    /// Calculate similarity between two traits
    fn calculate_trait_similarity(&self, trait1: &TraitInfo, trait2: &TraitInfo) -> f64 {
        let method_similarity = self.calculate_method_similarity(&trait1.methods, &trait2.methods);
        let implementation_similarity = self
            .calculate_implementation_similarity(&trait1.implementations, &trait2.implementations);
        let associated_type_similarity = self.calculate_associated_type_similarity(
            &trait1.associated_types,
            &trait2.associated_types,
        );

        // Weighted average
        method_similarity * 0.5 + implementation_similarity * 0.3 + associated_type_similarity * 0.2
    }

    fn calculate_method_similarity(&self, methods1: &[MethodInfo], methods2: &[MethodInfo]) -> f64 {
        if methods1.is_empty() && methods2.is_empty() {
            return 1.0;
        }
        if methods1.is_empty() || methods2.is_empty() {
            return 0.0;
        }

        let mut common_count = 0;
        for method1 in methods1 {
            for method2 in methods2 {
                if method1.name == method2.name
                    || self.methods_are_similar(&method1.signature, &method2.signature)
                {
                    common_count += 1;
                    break;
                }
            }
        }

        common_count as f64 / methods1.len().max(methods2.len()) as f64
    }

    fn calculate_implementation_similarity(&self, impls1: &[String], impls2: &[String]) -> f64 {
        if impls1.is_empty() && impls2.is_empty() {
            return 1.0;
        }
        if impls1.is_empty() || impls2.is_empty() {
            return 0.0;
        }

        let set1: HashSet<&String> = impls1.iter().collect();
        let set2: HashSet<&String> = impls2.iter().collect();
        let intersection = set1.intersection(&set2).count();
        let union = set1.union(&set2).count();

        intersection as f64 / union as f64
    }

    fn calculate_associated_type_similarity(
        &self,
        types1: &[AssociatedType],
        types2: &[AssociatedType],
    ) -> f64 {
        if types1.is_empty() && types2.is_empty() {
            return 1.0;
        }
        if types1.is_empty() || types2.is_empty() {
            return 0.0;
        }

        let names1: HashSet<&String> = types1.iter().map(|t| &t.name).collect();
        let names2: HashSet<&String> = types2.iter().map(|t| &t.name).collect();
        let intersection = names1.intersection(&names2).count();
        let union = names1.union(&names2).count();

        intersection as f64 / union as f64
    }

    fn methods_are_similar(&self, sig1: &str, sig2: &str) -> bool {
        // Simple similarity check - in practice, this would be more sophisticated
        let words1: HashSet<&str> = sig1.split_whitespace().collect();
        let words2: HashSet<&str> = sig2.split_whitespace().collect();
        let intersection = words1.intersection(&words2).count();
        let union = words1.union(&words2).count();

        if union == 0 {
            return false;
        }

        (intersection as f64 / union as f64) > 0.5
    }

    fn find_common_methods(&self, trait1: &TraitInfo, trait2: &TraitInfo) -> Vec<String> {
        let mut common = Vec::new();
        for method1 in &trait1.methods {
            for method2 in &trait2.methods {
                if method1.name == method2.name {
                    common.push(method1.name.clone());
                    break;
                }
            }
        }
        common
    }

    fn summarize_differences(&self, trait1: &TraitInfo, trait2: &TraitInfo) -> String {
        let methods1: HashSet<&String> = trait1.methods.iter().map(|m| &m.name).collect();
        let methods2: HashSet<&String> = trait2.methods.iter().map(|m| &m.name).collect();

        let unique_to_1: Vec<&String> = methods1.difference(&methods2).cloned().collect();
        let unique_to_2: Vec<&String> = methods2.difference(&methods1).cloned().collect();

        if unique_to_1.is_empty() && unique_to_2.is_empty() {
            "Methods are identical".to_string()
        } else {
            format!(
                "Methods unique to {}: {:?}, Methods unique to {}: {:?}",
                trait1.name, unique_to_1, trait2.name, unique_to_2
            )
        }
    }
}

/// Result of trait exploration analysis
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TraitExplorationResult {
    /// Name of the explored trait
    pub trait_name: String,
    /// Complete trait information
    pub trait_info: TraitInfo,
    /// Known implementations of this trait
    pub implementations: Vec<String>,
    /// Dependency analysis
    pub dependencies: DependencyAnalysis,
    /// Performance characteristics
    pub performance: PerformanceAnalysis,
    /// Complexity score (higher = more complex)
    pub complexity_score: f64,
    /// Visual graph representation
    pub graph: Option<TraitGraph>,
    /// Usage examples
    pub examples: Vec<UsageExample>,
    /// Related traits
    pub related_traits: Vec<String>,
    /// Exploration metadata
    pub exploration_metadata: ExplorationMetadata,
}

impl TraitExplorationResult {
    /// Export result to JSON format
    pub fn to_json(&self) -> Result<String> {
        serde_json::to_string_pretty(self)
            .map_err(|e| SklearsError::InvalidInput(format!("JSON serialization failed: {}", e)))
    }

    /// Get summary statistics
    pub fn get_summary(&self) -> ExplorationSummary {
        ExplorationSummary {
            trait_name: self.trait_name.clone(),
            method_count: self.trait_info.methods.len(),
            implementation_count: self.implementations.len(),
            complexity_score: self.complexity_score,
            dependency_count: self.dependencies.direct_dependencies.len(),
            related_trait_count: self.related_traits.len(),
            has_graph: self.graph.is_some(),
            example_count: self.examples.len(),
        }
    }
}

/// Core analyzer trait for modular analysis components
pub trait TraitAnalyzer {
    type Output;
    type Error: std::error::Error;

    fn analyze(&self, trait_info: &TraitInfo) -> std::result::Result<Self::Output, Self::Error>;
}

/// Event notification system for trait exploration
pub trait ExplorationEventHandler {
    fn on_trait_loaded(&self, trait_name: &str);
    fn on_trait_explored(&self, result: &TraitExplorationResult);
    fn on_error(&self, error: &SklearsError);
}

// Core data structures and types
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct DependencyAnalysis {
    pub direct_dependencies: Vec<String>,
    pub transitive_dependencies: Vec<String>,
    pub dependency_depth: usize,
    pub circular_dependencies: Vec<Vec<String>>,
}

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct PerformanceAnalysis {
    pub compilation_impact: CompilationImpact,
    pub runtime_overhead: RuntimeOverhead,
    pub memory_footprint: MemoryFootprint,
    pub optimization_hints: Vec<String>,
}

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct CompilationImpact {
    pub estimated_compile_time_ms: usize,
    pub monomorphization_cost: usize,
    pub code_size_impact: usize,
}

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct RuntimeOverhead {
    pub virtual_dispatch_cost: f64,
    pub inlining_potential: f64,
    pub optimization_level: OptimizationLevel,
}

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct MemoryFootprint {
    pub trait_object_size: usize,
    pub vtable_size: usize,
    pub cache_locality_score: f64,
}

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub enum OptimizationLevel {
    None,
    #[default]
    Basic,
    Advanced,
    Maximum,
}

// Core utility types for integration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TraitGraph {
    pub nodes: Vec<TraitGraphNode>,
    pub edges: Vec<TraitGraphEdge>,
    pub metadata: TraitGraphMetadata,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TraitGraphNode {
    pub id: String,
    pub label: String,
    pub node_type: TraitNodeType,
    pub description: String,
    pub complexity: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TraitGraphEdge {
    pub from: String,
    pub to: String,
    pub edge_type: EdgeType,
    pub weight: f64,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TraitGraphMetadata {
    pub center_node: String,
    pub generation_time: chrono::DateTime<chrono::Utc>,
    pub export_format: GraphExportFormat,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TraitNodeType {
    Trait,
    Supertrait,
    Implementation,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum EdgeType {
    Inherits,
    Implements,
    AssociatedWith,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UsageExample {
    pub title: String,
    pub description: String,
    pub code: String,
    pub category: ExampleCategory,
    pub difficulty: ExampleDifficulty,
    pub runnable: bool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ExampleCategory {
    Implementation,
    Usage,
    Generic,
    Advanced,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ExampleDifficulty {
    Beginner,
    Intermediate,
    Advanced,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SimilarTrait {
    pub name: String,
    pub similarity_score: f64,
    pub common_methods: Vec<String>,
    pub difference_summary: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExplorationMetadata {
    pub timestamp: chrono::DateTime<chrono::Utc>,
    pub duration: Duration,
    pub config_snapshot: ExplorerConfig,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExplorationSummary {
    pub trait_name: String,
    pub method_count: usize,
    pub implementation_count: usize,
    pub complexity_score: f64,
    pub dependency_count: usize,
    pub related_trait_count: usize,
    pub has_graph: bool,
    pub example_count: usize,
}

/// Metrics tracking for exploration performance
#[derive(Debug, Default)]
pub struct ExplorationMetrics {
    traits_explored: usize,
    total_exploration_time: Duration,
    cache_hits: usize,
    cache_misses: usize,
    errors: usize,
    crates_loaded: usize,
    total_load_time: Duration,
}

impl ExplorationMetrics {
    pub fn new() -> Self {
        Self::default()
    }

    pub fn increment_traits_explored(&mut self) {
        self.traits_explored += 1;
    }

    pub fn record_exploration_time(&mut self, duration: Duration) {
        self.total_exploration_time += duration;
    }

    pub fn increment_cache_hits(&mut self) {
        self.cache_hits += 1;
    }

    pub fn increment_cache_misses(&mut self) {
        self.cache_misses += 1;
    }

    pub fn increment_errors(&mut self) {
        self.errors += 1;
    }

    pub fn increment_crates_loaded(&mut self) {
        self.crates_loaded += 1;
    }

    pub fn record_load_time(&mut self, duration: Duration) {
        self.total_load_time += duration;
    }

    pub fn traits_explored(&self) -> usize {
        self.traits_explored
    }

    pub fn total_exploration_time(&self) -> Duration {
        self.total_exploration_time
    }

    pub fn cache_hit_rate(&self) -> f64 {
        let total_requests = self.cache_hits + self.cache_misses;
        if total_requests == 0 {
            0.0
        } else {
            self.cache_hits as f64 / total_requests as f64
        }
    }

    pub fn error_rate(&self) -> f64 {
        if self.traits_explored == 0 {
            0.0
        } else {
            self.errors as f64 / self.traits_explored as f64
        }
    }
}

/// Simple analysis cache
#[derive(Debug)]
pub struct AnalysisCache {
    trait_analyses: HashMap<String, TraitExplorationResult>,
}

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

impl AnalysisCache {
    pub fn new() -> Self {
        Self {
            trait_analyses: HashMap::new(),
        }
    }

    pub fn get_trait_analysis(&self, trait_name: &str) -> Option<TraitExplorationResult> {
        self.trait_analyses.get(trait_name).cloned()
    }

    pub fn store_trait_analysis(&mut self, trait_name: &str, result: TraitExplorationResult) {
        self.trait_analyses.insert(trait_name.to_string(), result);
    }

    pub fn clear(&mut self) {
        self.trait_analyses.clear();
    }
}

// Placeholder analyzer structs - these will be implemented in specialized modules
#[derive(Debug)]
pub struct TraitRegistry {
    traits: HashMap<String, TraitInfo>,
    implementations: HashMap<String, Vec<String>>,
    implementation_traits: HashMap<String, Vec<String>>,
}

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

impl TraitRegistry {
    pub fn new() -> Self {
        Self {
            traits: HashMap::new(),
            implementations: HashMap::new(),
            implementation_traits: HashMap::new(),
        }
    }

    pub fn load_sklears_traits(&mut self) -> Result<()> {
        // Placeholder implementation - will be replaced with actual trait loading
        Ok(())
    }

    pub fn get_trait(&self, name: &str) -> Option<&TraitInfo> {
        self.traits.get(name)
    }

    pub fn get_all_traits(&self) -> Vec<&TraitInfo> {
        self.traits.values().collect()
    }

    pub fn get_all_trait_names(&self) -> Vec<String> {
        self.traits.keys().cloned().collect()
    }

    pub fn get_implementations(&self, trait_name: &str) -> Vec<String> {
        self.implementations
            .get(trait_name)
            .cloned()
            .unwrap_or_default()
    }

    pub fn get_traits_for_implementation(&self, implementation: &str) -> Vec<String> {
        self.implementation_traits
            .get(implementation)
            .cloned()
            .unwrap_or_default()
    }
}

#[derive(Debug)]
pub struct DependencyAnalyzer;

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

impl DependencyAnalyzer {
    pub fn new() -> Self {
        Self
    }

    pub fn analyze_dependencies(&self, _trait_info: &TraitInfo) -> Result<DependencyAnalysis> {
        // Placeholder implementation
        Ok(DependencyAnalysis::default())
    }
}

#[derive(Debug)]
pub struct TraitPerformanceAnalyzer;

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

impl TraitPerformanceAnalyzer {
    pub fn new() -> Self {
        Self
    }

    pub fn analyze_trait_performance(
        &self,
        _trait_info: &TraitInfo,
    ) -> Result<PerformanceAnalysis> {
        // Placeholder implementation
        Ok(PerformanceAnalysis::default())
    }
}

#[derive(Debug)]
pub struct TraitGraphGenerator {
    config: ExplorerConfig,
}

impl TraitGraphGenerator {
    pub fn new(config: ExplorerConfig) -> Self {
        Self { config }
    }

    pub fn generate_trait_graph(
        &self,
        _trait_info: &TraitInfo,
        _implementations: &[String],
    ) -> Result<TraitGraph> {
        // Placeholder implementation
        Ok(TraitGraph {
            nodes: Vec::new(),
            edges: Vec::new(),
            metadata: TraitGraphMetadata {
                center_node: String::new(),
                generation_time: chrono::Utc::now(),
                export_format: self.config.export_format,
            },
        })
    }

    pub fn generate_full_graph(&self, _traits: &[&TraitInfo]) -> Result<TraitGraph> {
        // Placeholder implementation
        Ok(TraitGraph {
            nodes: Vec::new(),
            edges: Vec::new(),
            metadata: TraitGraphMetadata {
                center_node: String::new(),
                generation_time: chrono::Utc::now(),
                export_format: self.config.export_format,
            },
        })
    }
}

#[derive(Debug)]
pub struct ExampleGenerator;

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

impl ExampleGenerator {
    pub fn new() -> Self {
        Self
    }

    pub fn generate_usage_examples(&self, _trait_info: &TraitInfo) -> Result<Vec<UsageExample>> {
        // Placeholder implementation
        Ok(Vec::new())
    }
}

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

    #[test]
    fn test_explorer_config_builder() {
        let config = ExplorerConfig::new()
            .with_interactive_mode(true)
            .with_performance_analysis(false)
            .with_max_depth(5)
            .with_parallel_analysis(true)
            .with_verbose(true);

        assert!(config.interactive_mode);
        assert!(!config.performance_analysis);
        assert_eq!(config.max_depth, 5);
        assert!(config.parallel_analysis);
        assert!(config.verbose);
    }

    #[test]
    fn test_config_validation() {
        let invalid_config = ExplorerConfig::new().with_max_depth(0);
        assert!(invalid_config.validate().is_err());

        let valid_config = ExplorerConfig::new().with_max_depth(10);
        assert!(valid_config.validate().is_ok());
    }

    #[test]
    fn test_graph_export_format() {
        assert_eq!(GraphExportFormat::Svg.file_extension(), "svg");
        assert_eq!(GraphExportFormat::Json.mime_type(), "application/json");
        assert_eq!(GraphExportFormat::Dot.file_extension(), "dot");
    }

    #[test]
    fn test_trait_explorer_creation() {
        let config = ExplorerConfig::new();
        let explorer = TraitExplorer::new(config).expect("expected valid value");
        assert_eq!(explorer.get_metrics().traits_explored(), 0);
    }

    #[test]
    fn test_exploration_metrics() {
        let mut metrics = ExplorationMetrics::new();
        metrics.increment_traits_explored();
        metrics.increment_cache_hits();
        metrics.increment_cache_misses();

        assert_eq!(metrics.traits_explored(), 1);
        assert_eq!(metrics.cache_hit_rate(), 0.5);
    }

    #[test]
    fn test_analysis_cache() {
        let mut cache = AnalysisCache::new();
        assert!(cache.get_trait_analysis("NonExistent").is_none());

        cache.clear();
        assert!(cache.get_trait_analysis("NonExistent").is_none());
    }

    #[test]
    fn test_complexity_score_calculation() {
        let config = ExplorerConfig::new();
        let explorer = TraitExplorer::new(config).expect("expected valid value");

        let trait_info = TraitInfo {
            name: "TestTrait".to_string(),
            description: "Test trait".to_string(),
            path: "test::TestTrait".to_string(),
            methods: vec![],
            associated_types: vec![],
            generics: vec![],
            supertraits: vec![],
            implementations: vec![],
        };

        let dependencies = DependencyAnalysis::default();
        let score = explorer.calculate_complexity_score(&trait_info, &dependencies);
        assert!(score >= 0.0);
    }
}
