/// Full Pipeline: Complete Phase 1-6 Integration
///
/// Unified orchestration of all phases:
/// - Phase 1: Wiki-link graph (mem-ingest)
/// - Phase 2: Scoring pipeline (mem-core)
/// - Phase 3: Hybrid retrieval (QueryRouter)
/// - Phase 4: LLM optimization (ChunkOptimizer)
/// - Phase 5: Metadata enhancement (MetadataBooster)
/// - Phase 6: Cache alignment (KvCacheAligner)
///
/// This module provides:
/// - `FullPipeline`: complete query orchestration
/// - `PipelineConfig`: unified configuration
/// - `PipelineResult`: comprehensive result with all metrics

use anyhow::Result;
use std::collections::HashMap;
use std::sync::Arc;

use mem_core::{GlobalTfIdfScorer, SemanticScorer};
use mem_ingest::wiki_link::WikiLinkGraph;

use crate::query_router::{QueryRouter, RouterConfig, RoutedResult, SelectedChunk};
use crate::chunk_metadata::{MetadataExtractor, MetadataBooster, ChunkMetadata, ChunkCategory, QueryIntent};
use crate::cache_alignment::{KvCacheAligner, CachedChunk, CacheLocalityAnalyzer, RetrievalProfiler, CacheMetrics};

/// Unified pipeline configuration
#[derive(Debug, Clone)]
pub struct PipelineConfig {
    // Phase 1: Wiki-link
    pub project: String,
    pub wiki_root_doc: String,
    pub max_wiki_hops: u32,

    // Phase 3: Hybrid retrieval
    pub tfidf_threshold: f32,
    pub prefilter_limit: usize,
    pub rrf_tfidf_weight: f32,
    pub rrf_semantic_weight: f32,

    // Phase 4: LLM optimization
    pub score_threshold: f32,
    pub budget_bytes: usize,
    pub dedup_threshold: f32,

    // Phase 5: Metadata
    pub enable_metadata_boost: bool,
    pub category_boost_factor: f32,

    // Phase 6: Cache
    pub cache_capacity: usize,
    pub context_window: usize,
    pub chunk_avg_tokens: usize,
    pub preload_top_k: usize,
}

impl Default for PipelineConfig {
    fn default() -> Self {
        Self {
            // Phase 1
            project: "default".to_string(),
            wiki_root_doc: "index.md".to_string(),
            max_wiki_hops: 3,

            // Phase 3
            tfidf_threshold: 0.3,
            prefilter_limit: 50,
            rrf_tfidf_weight: 0.4,
            rrf_semantic_weight: 0.6,

            // Phase 4
            score_threshold: 0.6,
            budget_bytes: 8192,
            dedup_threshold: 0.8,

            // Phase 5
            enable_metadata_boost: true,
            category_boost_factor: 1.5,

            // Phase 6
            cache_capacity: 1000,
            context_window: 4096,
            chunk_avg_tokens: 100,
            preload_top_k: 5,
        }
    }
}

/// Fully enriched chunk with all phase metadata
#[derive(Debug, Clone)]
pub struct EnrichedChunk {
    // Core
    pub id: String,
    pub text: String,

    // Phase 3: Retrieval scores
    pub tfidf_score: f32,
    pub semantic_score: f32,
    pub rrf_score: f32,

    // Phase 4: Optimization
    pub pre_boost_score: f32,
    pub final_score: f32,

    // Phase 5: Metadata
    pub category: ChunkCategory,
    pub heading: Option<String>,
    pub key_terms: Vec<String>,
    pub metadata_boost: f32,
    pub query_intent_match: bool,

    // Phase 6: Cache
    pub wiki_distance: Option<u32>,
    pub cache_slot: u32,
    pub cache_priority: f32,
}

/// Pipeline execution metrics
#[derive(Debug, Clone)]
pub struct PipelineMetrics {
    // Phase counts
    pub wiki_scope_docs: usize,
    pub prefilter_candidates: usize,
    pub post_optimization_count: usize,

    // Phase 4 metrics
    pub rejected_by_threshold: usize,
    pub rejected_by_budget: usize,
    pub dedup_removed: usize,
    pub budget_used_bytes: usize,
    pub budget_used_pct: f32,

    // Phase 5 metrics
    pub metadata_boosts_applied: usize,
    pub avg_boost: f32,

    // Phase 6 metrics
    pub cache_hits: u64,
    pub cache_misses: u64,
    pub cache_hit_ratio: f32,
    pub preloaded_chunks: usize,

    // Timing
    pub phase_timings: Vec<(String, u64)>,
    pub total_latency_ms: u64,
}

impl PipelineMetrics {
    pub fn new() -> Self {
        Self {
            wiki_scope_docs: 0,
            prefilter_candidates: 0,
            post_optimization_count: 0,
            rejected_by_threshold: 0,
            rejected_by_budget: 0,
            dedup_removed: 0,
            budget_used_bytes: 0,
            budget_used_pct: 0.0,
            metadata_boosts_applied: 0,
            avg_boost: 0.0,
            cache_hits: 0,
            cache_misses: 0,
            cache_hit_ratio: 0.0,
            preloaded_chunks: 0,
            phase_timings: Vec::new(),
            total_latency_ms: 0,
        }
    }
}

/// Complete pipeline result
#[derive(Debug, Clone)]
pub struct PipelineResult {
    pub query: String,
    pub query_intent: QueryIntent,
    pub chunks: Vec<EnrichedChunk>,
    pub metrics: PipelineMetrics,
}

/// Full Pipeline: orchestrates all phases
pub struct FullPipeline {
    router: QueryRouter,
    booster: MetadataBooster,
    aligner: KvCacheAligner,
    profiler: RetrievalProfiler,
    config: PipelineConfig,
}

impl FullPipeline {
    pub fn new(
        tfidf_scorer: Arc<GlobalTfIdfScorer>,
        semantic_scorer: Arc<SemanticScorer>,
        config: PipelineConfig,
    ) -> Self {
        let router_config = RouterConfig {
            max_wiki_hops: config.max_wiki_hops,
            tfidf_threshold: config.tfidf_threshold,
            prefilter_limit: config.prefilter_limit,
            score_threshold: config.score_threshold,
            budget_bytes: config.budget_bytes,
            dedup_threshold: config.dedup_threshold,
            rrf_tfidf_weight: config.rrf_tfidf_weight,
            rrf_semantic_weight: config.rrf_semantic_weight,
        };

        let router = QueryRouter::new(tfidf_scorer, semantic_scorer, router_config);
        let booster = MetadataBooster::new();
        let aligner = KvCacheAligner::new(
            config.context_window,
            config.chunk_avg_tokens,
            config.cache_capacity,
        );
        let profiler = RetrievalProfiler::new();

        Self {
            router,
            booster,
            aligner,
            profiler,
            config,
        }
    }

    /// Execute full pipeline with wiki-graph
    pub async fn execute_with_wiki(
        &self,
        query: &str,
        wiki_graph: &WikiLinkGraph,
        candidates: Vec<(String, String)>,
    ) -> Result<PipelineResult> {
        let start = std::time::Instant::now();
        let mut metrics = PipelineMetrics::new();

        // Phase 5: Infer query intent
        let t0 = std::time::Instant::now();
        let query_intent = MetadataExtractor::infer_query_intent(query);
        metrics.phase_timings.push(("intent_inference".to_string(), t0.elapsed().as_millis() as u64));

        // Phase 1-4: Wiki-scoped hybrid retrieval + optimization
        let t1 = std::time::Instant::now();
        let routed = self.router
            .route_with_wiki_graph(query, wiki_graph, &self.config.wiki_root_doc, candidates)
            .await?;
        metrics.phase_timings.push(("routing_retrieval".to_string(), t1.elapsed().as_millis() as u64));

        metrics.wiki_scope_docs = routed.wiki_scope_size;
        metrics.prefilter_candidates = routed.prefilter_size;
        metrics.post_optimization_count = routed.selected_chunks.len();
        metrics.dedup_removed = routed.metrics.dedup_removed;
        metrics.budget_used_bytes = routed.metrics.total_bytes;
        metrics.budget_used_pct = routed.metrics.budget_used_pct;
        metrics.rejected_by_threshold = routed.metrics.rejected_count;

        // Phase 5: Apply metadata boost
        let t2 = std::time::Instant::now();
        let mut enriched_chunks = Vec::new();
        let mut total_boost = 0.0;
        let mut boosts_applied = 0;

        for chunk in routed.selected_chunks {
            let metadata = MetadataExtractor::extract(&chunk.id, &chunk.text);
            let mut boost = 0.0;
            let mut intent_match = false;

            if self.config.enable_metadata_boost {
                boost = self.booster.calculate_boost(query_intent, &metadata);
                if boost > 0.0 {
                    boosts_applied += 1;
                    total_boost += boost;
                    intent_match = true;
                }
            }

            let boosted_score = self.booster.apply_boost(chunk.final_score, boost);

            enriched_chunks.push(EnrichedChunk {
                id: chunk.id.clone(),
                text: chunk.text.clone(),
                tfidf_score: chunk.tfidf_score,
                semantic_score: chunk.semantic_score,
                rrf_score: chunk.final_score,
                pre_boost_score: chunk.final_score,
                final_score: boosted_score,
                category: metadata.category,
                heading: metadata.heading,
                key_terms: metadata.key_terms,
                metadata_boost: boost,
                query_intent_match: intent_match,
                wiki_distance: chunk.wiki_distance,
                cache_slot: 0,
                cache_priority: 0.0,
            });
        }

        metrics.metadata_boosts_applied = boosts_applied;
        metrics.avg_boost = if boosts_applied > 0 { total_boost / boosts_applied as f32 } else { 0.0 };
        metrics.phase_timings.push(("metadata_boost".to_string(), t2.elapsed().as_millis() as u64));

        // Re-sort by boosted score
        enriched_chunks.sort_by(|a, b| {
            b.final_score.partial_cmp(&a.final_score).unwrap_or(std::cmp::Ordering::Equal)
        });

        // Phase 6: Cache alignment
        let t3 = std::time::Instant::now();
        let cached: Vec<CachedChunk> = enriched_chunks
            .iter()
            .enumerate()
            .map(|(i, chunk)| CachedChunk {
                chunk_id: chunk.id.clone(),
                text: chunk.text.clone(),
                score: chunk.final_score,
                cache_distance: chunk.wiki_distance.unwrap_or(u32::MAX),
                access_count: 1,
                last_accessed_slot: i as u32,
            })
            .collect();

        // Assign cache slots
        let slots = self.aligner.assign_slots(&cached);
        for chunk in &mut enriched_chunks {
            if let Some((_, slot)) = slots.iter().find(|(id, _)| id == &chunk.id) {
                chunk.cache_slot = *slot;
            }
            // Cache priority: higher score + closer wiki distance = higher priority
            let dist_factor = 1.0 / (1.0 + chunk.wiki_distance.unwrap_or(10) as f32);
            chunk.cache_priority = chunk.final_score * dist_factor;
        }

        // Preload hot chunks
        let preload_chunks: Vec<_> = enriched_chunks
            .iter()
            .take(self.config.preload_top_k)
            .map(|c| (c.id.as_str(), c.text.as_str()))
            .collect();
        self.aligner.preload_hot_chunks(preload_chunks)?;
        metrics.preloaded_chunks = self.config.preload_top_k.min(enriched_chunks.len());

        let cache_metrics = self.aligner.get_metrics();
        metrics.cache_hits = cache_metrics.hits;
        metrics.cache_misses = cache_metrics.misses;
        metrics.cache_hit_ratio = cache_metrics.hit_ratio();
        metrics.phase_timings.push(("cache_alignment".to_string(), t3.elapsed().as_millis() as u64));

        metrics.total_latency_ms = start.elapsed().as_millis() as u64;

        Ok(PipelineResult {
            query: query.to_string(),
            query_intent,
            chunks: enriched_chunks,
            metrics,
        })
    }

    /// Execute pipeline without wiki-graph (direct mode)
    pub async fn execute_direct(
        &self,
        query: &str,
        candidates: Vec<(String, String)>,
    ) -> Result<PipelineResult> {
        let start = std::time::Instant::now();
        let mut metrics = PipelineMetrics::new();

        // Phase 5: Infer query intent
        let t0 = std::time::Instant::now();
        let query_intent = MetadataExtractor::infer_query_intent(query);
        metrics.phase_timings.push(("intent_inference".to_string(), t0.elapsed().as_millis() as u64));

        // Phase 3-4: Direct retrieval + optimization
        let t1 = std::time::Instant::now();
        let routed = self.router.route_direct(query, candidates).await?;
        metrics.phase_timings.push(("routing_retrieval".to_string(), t1.elapsed().as_millis() as u64));

        metrics.wiki_scope_docs = routed.wiki_scope_size;
        metrics.prefilter_candidates = routed.prefilter_size;
        metrics.post_optimization_count = routed.selected_chunks.len();
        metrics.dedup_removed = routed.metrics.dedup_removed;
        metrics.budget_used_bytes = routed.metrics.total_bytes;
        metrics.budget_used_pct = routed.metrics.budget_used_pct;

        // Phase 5: Apply metadata boost
        let t2 = std::time::Instant::now();
        let mut enriched_chunks = Vec::new();
        let mut total_boost = 0.0;
        let mut boosts_applied = 0;

        for chunk in routed.selected_chunks {
            let metadata = MetadataExtractor::extract(&chunk.id, &chunk.text);
            let mut boost = 0.0;
            let mut intent_match = false;

            if self.config.enable_metadata_boost {
                boost = self.booster.calculate_boost(query_intent, &metadata);
                if boost > 0.0 {
                    boosts_applied += 1;
                    total_boost += boost;
                    intent_match = true;
                }
            }

            let boosted_score = self.booster.apply_boost(chunk.final_score, boost);

            enriched_chunks.push(EnrichedChunk {
                id: chunk.id.clone(),
                text: chunk.text.clone(),
                tfidf_score: chunk.tfidf_score,
                semantic_score: chunk.semantic_score,
                rrf_score: chunk.final_score,
                pre_boost_score: chunk.final_score,
                final_score: boosted_score,
                category: metadata.category,
                heading: metadata.heading,
                key_terms: metadata.key_terms,
                metadata_boost: boost,
                query_intent_match: intent_match,
                wiki_distance: None,
                cache_slot: 0,
                cache_priority: 0.0,
            });
        }

        metrics.metadata_boosts_applied = boosts_applied;
        metrics.avg_boost = if boosts_applied > 0 { total_boost / boosts_applied as f32 } else { 0.0 };
        metrics.phase_timings.push(("metadata_boost".to_string(), t2.elapsed().as_millis() as u64));

        // Re-sort by boosted score
        enriched_chunks.sort_by(|a, b| {
            b.final_score.partial_cmp(&a.final_score).unwrap_or(std::cmp::Ordering::Equal)
        });

        // Phase 6: Cache alignment (simplified without wiki distances)
        let t3 = std::time::Instant::now();
        let cached: Vec<CachedChunk> = enriched_chunks
            .iter()
            .enumerate()
            .map(|(i, chunk)| CachedChunk {
                chunk_id: chunk.id.clone(),
                text: chunk.text.clone(),
                score: chunk.final_score,
                cache_distance: i as u32, // Use position as distance proxy
                access_count: 1,
                last_accessed_slot: i as u32,
            })
            .collect();

        let slots = self.aligner.assign_slots(&cached);
        for chunk in &mut enriched_chunks {
            if let Some((_, slot)) = slots.iter().find(|(id, _)| id == &chunk.id) {
                chunk.cache_slot = *slot;
            }
            chunk.cache_priority = chunk.final_score;
        }

        let preload_chunks: Vec<_> = enriched_chunks
            .iter()
            .take(self.config.preload_top_k)
            .map(|c| (c.id.as_str(), c.text.as_str()))
            .collect();
        self.aligner.preload_hot_chunks(preload_chunks)?;
        metrics.preloaded_chunks = self.config.preload_top_k.min(enriched_chunks.len());

        let cache_metrics = self.aligner.get_metrics();
        metrics.cache_hits = cache_metrics.hits;
        metrics.cache_misses = cache_metrics.misses;
        metrics.cache_hit_ratio = cache_metrics.hit_ratio();
        metrics.phase_timings.push(("cache_alignment".to_string(), t3.elapsed().as_millis() as u64));

        metrics.total_latency_ms = start.elapsed().as_millis() as u64;

        Ok(PipelineResult {
            query: query.to_string(),
            query_intent,
            chunks: enriched_chunks,
            metrics,
        })
    }

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

    /// Get profiler summary
    pub fn profiler_summary(&self) -> Vec<(String, u64)> {
        self.profiler.summary()
    }
}

/// Builder for FullPipeline with sensible defaults
pub struct PipelineBuilder {
    tfidf_scorer: Option<Arc<GlobalTfIdfScorer>>,
    semantic_scorer: Option<Arc<SemanticScorer>>,
    config: PipelineConfig,
}

impl PipelineBuilder {
    pub fn new() -> Self {
        Self {
            tfidf_scorer: None,
            semantic_scorer: None,
            config: PipelineConfig::default(),
        }
    }

    pub fn with_scorers(
        mut self,
        tfidf: Arc<GlobalTfIdfScorer>,
        semantic: Arc<SemanticScorer>,
    ) -> Self {
        self.tfidf_scorer = Some(tfidf);
        self.semantic_scorer = Some(semantic);
        self
    }

    pub fn with_project(mut self, project: &str) -> Self {
        self.config.project = project.to_string();
        self
    }

    pub fn with_wiki_root(mut self, root_doc: &str) -> Self {
        self.config.wiki_root_doc = root_doc.to_string();
        self
    }

    pub fn with_budget(mut self, bytes: usize) -> Self {
        self.config.budget_bytes = bytes;
        self
    }

    pub fn with_score_threshold(mut self, threshold: f32) -> Self {
        self.config.score_threshold = threshold;
        self
    }

    pub fn with_metadata_boost(mut self, enabled: bool) -> Self {
        self.config.enable_metadata_boost = enabled;
        self
    }

    pub fn with_cache_capacity(mut self, capacity: usize) -> Self {
        self.config.cache_capacity = capacity;
        self
    }

    pub fn with_config(mut self, config: PipelineConfig) -> Self {
        self.config = config;
        self
    }

    pub fn build(self) -> Result<FullPipeline> {
        let tfidf = self.tfidf_scorer
            .ok_or_else(|| anyhow::anyhow!("TF-IDF scorer required"))?;
        let semantic = self.semantic_scorer
            .ok_or_else(|| anyhow::anyhow!("Semantic scorer required"))?;

        Ok(FullPipeline::new(tfidf, semantic, self.config))
    }
}

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

    fn create_test_vocab() -> Arc<BTreeMap<String, f32>> {
        let mut vocab = BTreeMap::new();
        vocab.insert("kubernetes".to_string(), 0.8);
        vocab.insert("pod".to_string(), 0.7);
        vocab.insert("error".to_string(), 0.9);
        vocab.insert("fix".to_string(), 0.85);
        vocab.insert("solution".to_string(), 0.8);
        Arc::new(vocab)
    }

    fn create_test_pipeline() -> FullPipeline {
        let vocab = create_test_vocab();
        let tfidf = Arc::new(GlobalTfIdfScorer::new(vocab));
        let semantic = Arc::new(SemanticScorer::new());
        FullPipeline::new(tfidf, semantic, PipelineConfig::default())
    }

    fn create_test_wiki_graph() -> WikiLinkGraph {
        let mut graph = WikiLinkGraph::new("test");
        graph.add_link("index.md", "tools/kubectl.md");
        graph.add_link("tools/kubectl.md", "debugging/pod-errors.md");
        graph.add_link("debugging/pod-errors.md", "solutions/restart.md");
        graph
    }

    fn create_test_candidates() -> Vec<(String, String)> {
        vec![
            ("index.md".to_string(), "# Index\nKubernetes documentation.".to_string()),
            ("tools/kubectl.md".to_string(), "# Kubectl\nTool for kubernetes pod management.".to_string()),
            ("debugging/pod-errors.md".to_string(), "# Pod Errors\nError: CrashLoopBackOff. Fix by checking logs.".to_string()),
            ("solutions/restart.md".to_string(), "# Restart Solution\nSolution: restart the failing pod.".to_string()),
            ("unrelated.md".to_string(), "# Unrelated\nDocker container guide.".to_string()),
        ]
    }

    #[test]
    fn test_pipeline_config_default() {
        let config = PipelineConfig::default();
        assert_eq!(config.max_wiki_hops, 3);
        assert_eq!(config.score_threshold, 0.6);
        assert_eq!(config.budget_bytes, 8192);
        assert!(config.enable_metadata_boost);
    }

    #[test]
    fn test_pipeline_metrics_new() {
        let metrics = PipelineMetrics::new();
        assert_eq!(metrics.wiki_scope_docs, 0);
        assert_eq!(metrics.total_latency_ms, 0);
        assert!(metrics.phase_timings.is_empty());
    }

    #[test]
    fn test_enriched_chunk_structure() {
        let chunk = EnrichedChunk {
            id: "doc1".to_string(),
            text: "content".to_string(),
            tfidf_score: 0.4,
            semantic_score: 0.6,
            rrf_score: 0.5,
            pre_boost_score: 0.5,
            final_score: 0.6,
            category: ChunkCategory::Solution,
            heading: Some("Fix Pods".to_string()),
            key_terms: vec!["kubernetes".to_string()],
            metadata_boost: 0.1,
            query_intent_match: true,
            wiki_distance: Some(2),
            cache_slot: 0,
            cache_priority: 0.8,
        };

        assert_eq!(chunk.id, "doc1");
        assert!(chunk.query_intent_match);
        assert_eq!(chunk.wiki_distance, Some(2));
    }

    #[test]
    fn test_pipeline_builder() {
        let vocab = create_test_vocab();
        let tfidf = Arc::new(GlobalTfIdfScorer::new(vocab));
        let semantic = Arc::new(SemanticScorer::new());

        let pipeline = PipelineBuilder::new()
            .with_scorers(tfidf, semantic)
            .with_project("test-project")
            .with_budget(4096)
            .with_score_threshold(0.7)
            .with_metadata_boost(true)
            .build()
            .unwrap();

        assert_eq!(pipeline.config().project, "test-project");
        assert_eq!(pipeline.config().budget_bytes, 4096);
        assert_eq!(pipeline.config().score_threshold, 0.7);
    }

    #[test]
    fn test_pipeline_builder_missing_scorers() {
        let result = PipelineBuilder::new().build();
        assert!(result.is_err());
    }

    #[tokio::test]
    async fn test_execute_with_wiki() {
        let pipeline = create_test_pipeline();
        let graph = create_test_wiki_graph();
        let candidates = create_test_candidates();

        let result = pipeline
            .execute_with_wiki("fix kubernetes pod error", &graph, candidates)
            .await
            .unwrap();

        assert_eq!(result.query, "fix kubernetes pod error");
        assert_eq!(result.query_intent, QueryIntent::FixError);
        assert!(result.metrics.total_latency_ms >= 0);
        assert!(!result.metrics.phase_timings.is_empty());
    }

    #[tokio::test]
    async fn test_execute_direct() {
        let pipeline = create_test_pipeline();
        let candidates = create_test_candidates();

        let result = pipeline
            .execute_direct("kubernetes deployment", candidates)
            .await
            .unwrap();

        assert_eq!(result.query, "kubernetes deployment");
        assert!(result.metrics.wiki_scope_docs > 0);
    }

    #[tokio::test]
    async fn test_metadata_boost_applied() {
        let pipeline = create_test_pipeline();
        let candidates = vec![
            ("error-doc.md".to_string(), "# Error\nPod error CrashLoopBackOff fix solution.".to_string()),
            ("concept-doc.md".to_string(), "# Concept\nKubernetes pod design pattern.".to_string()),
        ];

        let result = pipeline
            .execute_direct("fix pod error", candidates)
            .await
            .unwrap();

        // FixError query should boost error/solution chunks
        assert_eq!(result.query_intent, QueryIntent::FixError);

        // Check that metadata boost was applied
        for chunk in &result.chunks {
            if chunk.category == ChunkCategory::Error || chunk.category == ChunkCategory::Solution {
                // These should have intent match
                if chunk.text.contains("error") || chunk.text.contains("solution") {
                    // Boost might be applied depending on category detection
                }
            }
        }
    }

    #[tokio::test]
    async fn test_cache_preload() {
        let pipeline = create_test_pipeline();
        let candidates = create_test_candidates();

        let result = pipeline
            .execute_direct("kubernetes", candidates)
            .await
            .unwrap();

        // Should have preloaded some chunks
        assert!(result.metrics.preloaded_chunks <= pipeline.config().preload_top_k);
    }

    #[tokio::test]
    async fn test_wiki_distance_calculation() {
        let pipeline = create_test_pipeline();
        let graph = create_test_wiki_graph();
        let candidates = create_test_candidates();

        let result = pipeline
            .execute_with_wiki("kubernetes", &graph, candidates)
            .await
            .unwrap();

        // Chunks should have wiki_distance populated
        for chunk in &result.chunks {
            // Wiki distances should be within max_hops or None if unreachable
            if let Some(dist) = chunk.wiki_distance {
                assert!(dist <= pipeline.config().max_wiki_hops);
            }
        }
    }

    #[tokio::test]
    async fn test_phase_timings() {
        let pipeline = create_test_pipeline();
        let candidates = create_test_candidates();

        let result = pipeline
            .execute_direct("test query", candidates)
            .await
            .unwrap();

        // Should have timing for all phases
        let phase_names: Vec<_> = result.metrics.phase_timings.iter().map(|(n, _)| n.as_str()).collect();
        assert!(phase_names.contains(&"intent_inference"));
        assert!(phase_names.contains(&"routing_retrieval"));
        assert!(phase_names.contains(&"metadata_boost"));
        assert!(phase_names.contains(&"cache_alignment"));
    }

    #[tokio::test]
    async fn test_empty_candidates() {
        let pipeline = create_test_pipeline();
        let result = pipeline
            .execute_direct("query", vec![])
            .await
            .unwrap();

        assert!(result.chunks.is_empty());
        assert_eq!(result.metrics.post_optimization_count, 0);
    }

    #[test]
    fn test_cache_priority_calculation() {
        // Higher score + closer wiki distance = higher priority
        let chunk_close = EnrichedChunk {
            id: "close".to_string(),
            text: "".to_string(),
            tfidf_score: 0.0,
            semantic_score: 0.0,
            rrf_score: 0.0,
            pre_boost_score: 0.0,
            final_score: 0.8,
            category: ChunkCategory::Unknown,
            heading: None,
            key_terms: vec![],
            metadata_boost: 0.0,
            query_intent_match: false,
            wiki_distance: Some(1),
            cache_slot: 0,
            cache_priority: 0.8 * (1.0 / 2.0), // score * 1/(1+dist)
        };

        let chunk_far = EnrichedChunk {
            wiki_distance: Some(5),
            cache_priority: 0.8 * (1.0 / 6.0),
            ..chunk_close.clone()
        };

        assert!(chunk_close.cache_priority > chunk_far.cache_priority);
    }
}