oxirs-embed 0.4.1

//! Integration utilities with other OxiRS components

use crate::{EmbeddingModel, Vector};
use anyhow::{anyhow, Result};
use oxirs_vec::index::{AdvancedVectorIndex, IndexConfig, IndexType};
use oxirs_vec::VectorIndex as OxirsVectorIndex;
use std::collections::HashMap;
use tracing::{debug, info, warn};

/// Integration bridge between oxirs-embed and vector stores
pub struct VectorStoreBridge {
    entity_mappings: HashMap<String, String>,
    relation_mappings: HashMap<String, String>,
    prefix_config: PrefixConfig,
    /// Flat (brute-force) vector index over synced entity embeddings, keyed
    /// by the same URI stored in `entity_mappings`, backing
    /// [`find_similar_entities`](Self::find_similar_entities).
    entity_index: AdvancedVectorIndex,
    /// Same as `entity_index` but for relation embeddings, backing
    /// [`find_similar_relations`](Self::find_similar_relations).
    relation_index: AdvancedVectorIndex,
}

fn flat_index() -> AdvancedVectorIndex {
    AdvancedVectorIndex::new(IndexConfig {
        index_type: IndexType::Flat,
        ..IndexConfig::default()
    })
}

/// Configuration for URI prefixes in vector store
#[derive(Debug, Clone)]
pub struct PrefixConfig {
    pub entity_prefix: String,
    pub relation_prefix: String,
    pub use_namespaces: bool,
}

impl Default for PrefixConfig {
    fn default() -> Self {
        Self {
            entity_prefix: "kg:entity:".to_string(),
            relation_prefix: "kg:relation:".to_string(),
            use_namespaces: true,
        }
    }
}

impl VectorStoreBridge {
    /// Create a new bridge
    pub fn new() -> Self {
        Self {
            entity_mappings: HashMap::new(),
            relation_mappings: HashMap::new(),
            prefix_config: PrefixConfig::default(),
            entity_index: flat_index(),
            relation_index: flat_index(),
        }
    }

    /// Create bridge with custom prefix config
    pub fn with_prefix_config(prefix_config: PrefixConfig) -> Self {
        Self {
            entity_mappings: HashMap::new(),
            relation_mappings: HashMap::new(),
            prefix_config,
            entity_index: flat_index(),
            relation_index: flat_index(),
        }
    }

    /// Sync all embeddings from a model to the vector store
    pub fn sync_model_embeddings(&mut self, model: &dyn EmbeddingModel) -> Result<SyncStats> {
        let start_time = std::time::Instant::now();
        let mut sync_stats = SyncStats::default();

        info!("Starting embedding synchronization to vector store");

        // Sync entity embeddings
        let entities = model.get_entities();
        for entity in &entities {
            match model.get_entity_embedding(entity) {
                Ok(embedding) => {
                    let uri = self.generate_entity_uri(entity);
                    if let Err(e) = self
                        .entity_index
                        .insert(uri.clone(), embedding.into_inner())
                    {
                        warn!("Failed to index embedding for entity {}: {}", entity, e);
                        sync_stats
                            .errors
                            .push(format!("Entity {entity} (indexing): {e}"));
                        continue;
                    }
                    self.entity_mappings.insert(entity.clone(), uri);
                    sync_stats.entities_synced += 1;
                }
                Err(e) => {
                    warn!("Failed to get embedding for entity {}: {}", entity, e);
                    sync_stats.errors.push(format!("Entity {entity}: {e}"));
                }
            }
        }

        // Sync relation embeddings
        let relations = model.get_relations();
        for relation in &relations {
            match model.get_relation_embedding(relation) {
                Ok(embedding) => {
                    let uri = self.generate_relation_uri(relation);
                    if let Err(e) = self
                        .relation_index
                        .insert(uri.clone(), embedding.into_inner())
                    {
                        warn!("Failed to index embedding for relation {}: {}", relation, e);
                        sync_stats
                            .errors
                            .push(format!("Relation {relation} (indexing): {e}"));
                        continue;
                    }
                    self.relation_mappings.insert(relation.clone(), uri);
                    sync_stats.relations_synced += 1;
                }
                Err(e) => {
                    warn!("Failed to get embedding for relation {}: {}", relation, e);
                    sync_stats.errors.push(format!("Relation {relation}: {e}"));
                }
            }
        }

        sync_stats.sync_duration = start_time.elapsed();
        info!(
            "Embedding sync completed: {} entities, {} relations, {} errors",
            sync_stats.entities_synced,
            sync_stats.relations_synced,
            sync_stats.errors.len()
        );

        Ok(sync_stats)
    }

    /// Find entities most similar to `entity` by cosine/L2 distance (per the
    /// index's configured metric) between their synced embeddings. `entity`
    /// itself is excluded from the results.
    pub fn find_similar_entities(&self, entity: &str, k: usize) -> Result<Vec<(String, f32)>> {
        let uri = self
            .entity_mappings
            .get(entity)
            .ok_or_else(|| anyhow!("Entity not found in mappings: {}", entity))?;
        let query = self
            .entity_index
            .get_vector(uri)
            .ok_or_else(|| anyhow!("Entity '{}' is mapped but has no indexed embedding", entity))?;

        debug!("Searching for entities similar to: {}", entity);
        let results = self.entity_index.search_knn(query, k + 1)?;
        Ok(results
            .into_iter()
            .filter(|(result_uri, _)| result_uri != uri)
            .take(k)
            .map(|(result_uri, distance)| (self.entity_name_from_uri(&result_uri), distance))
            .collect())
    }

    /// Find relations most similar to `relation`, analogous to
    /// [`find_similar_entities`](Self::find_similar_entities).
    pub fn find_similar_relations(&self, relation: &str, k: usize) -> Result<Vec<(String, f32)>> {
        let uri = self
            .relation_mappings
            .get(relation)
            .ok_or_else(|| anyhow!("Relation not found in mappings: {}", relation))?;
        let query = self.relation_index.get_vector(uri).ok_or_else(|| {
            anyhow!(
                "Relation '{}' is mapped but has no indexed embedding",
                relation
            )
        })?;

        debug!("Searching for relations similar to: {}", relation);
        let results = self.relation_index.search_knn(query, k + 1)?;
        Ok(results
            .into_iter()
            .filter(|(result_uri, _)| result_uri != uri)
            .take(k)
            .map(|(result_uri, distance)| (self.relation_name_from_uri(&result_uri), distance))
            .collect())
    }

    /// Recover the original entity name from a generated URI (inverse of
    /// [`generate_entity_uri`](Self::generate_entity_uri)).
    fn entity_name_from_uri(&self, uri: &str) -> String {
        uri.strip_prefix(&self.prefix_config.entity_prefix)
            .unwrap_or(uri)
            .to_string()
    }

    /// Recover the original relation name from a generated URI (inverse of
    /// [`generate_relation_uri`](Self::generate_relation_uri)).
    fn relation_name_from_uri(&self, uri: &str) -> String {
        uri.strip_prefix(&self.prefix_config.relation_prefix)
            .unwrap_or(uri)
            .to_string()
    }

    /// Generate URI for entity
    fn generate_entity_uri(&self, entity: &str) -> String {
        if self.prefix_config.use_namespaces {
            format!("{}{}", self.prefix_config.entity_prefix, entity)
        } else {
            entity.to_string()
        }
    }

    /// Generate URI for relation
    fn generate_relation_uri(&self, relation: &str) -> String {
        if self.prefix_config.use_namespaces {
            format!("{}{}", self.prefix_config.relation_prefix, relation)
        } else {
            relation.to_string()
        }
    }

    /// Get sync statistics
    pub fn get_sync_info(&self) -> SyncInfo {
        SyncInfo {
            entities_mapped: self.entity_mappings.len(),
            relations_mapped: self.relation_mappings.len(),
            vector_store_stats: None,
        }
    }

    /// Clear all mappings
    pub fn clear_mappings(&mut self) {
        self.entity_mappings.clear();
        self.relation_mappings.clear();
        info!("Cleared all entity and relation mappings");
    }
}

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

/// Statistics from synchronization operation
#[derive(Debug, Clone, Default)]
pub struct SyncStats {
    pub entities_synced: usize,
    pub relations_synced: usize,
    pub errors: Vec<String>,
    pub sync_duration: std::time::Duration,
}

/// Information about current sync state
#[derive(Debug, Clone)]
pub struct SyncInfo {
    pub entities_mapped: usize,
    pub relations_mapped: usize,
    pub vector_store_stats: Option<(usize, usize)>,
}

/// Integration with oxirs-chat for conversational AI
pub struct ChatIntegration {
    model: Box<dyn EmbeddingModel>,
    context_window: usize,
    similarity_threshold: f32,
    personalization: PersonalizationEngine,
    multilingual: MultilingualSupport,
}

impl ChatIntegration {
    /// Create new chat integration
    pub fn new(model: Box<dyn EmbeddingModel>) -> Self {
        Self {
            model,
            context_window: 10,
            similarity_threshold: 0.7,
            personalization: PersonalizationEngine::new(),
            multilingual: MultilingualSupport::new(),
        }
    }

    /// Configure context window size
    pub fn with_context_window(mut self, window_size: usize) -> Self {
        self.context_window = window_size;
        self
    }

    /// Configure similarity threshold for relevant entities
    pub fn with_similarity_threshold(mut self, threshold: f32) -> Self {
        self.similarity_threshold = threshold;
        self
    }

    /// Extract entities from the model's vocabulary that appear as a
    /// substring of `query` (case-insensitive).
    ///
    /// Rather than scanning the whole query once per known entity (`O(entities
    /// × query length)`), this builds a lowercase-name index once and scans
    /// the query a single time for bounded-length substring windows against
    /// that index (`O(entities + query length × longest entity name)`).
    pub fn extract_relevant_entities(&self, query: &str) -> Result<Vec<String>> {
        let entities = self.model.get_entities();
        if entities.is_empty() {
            return Ok(Vec::new());
        }

        let query_lower = query.to_lowercase();

        let mut entity_index: HashMap<String, String> = HashMap::new();
        let mut max_entity_chars = 0usize;
        for entity in entities {
            let lower = entity.to_lowercase();
            max_entity_chars = max_entity_chars.max(lower.chars().count());
            entity_index.insert(lower, entity);
        }
        if max_entity_chars == 0 {
            return Ok(Vec::new());
        }

        // Byte offset of every character boundary in the query (plus one past
        // the end) so substrings never split a multi-byte UTF-8 character.
        let boundaries: Vec<usize> = query_lower
            .char_indices()
            .map(|(byte_idx, _)| byte_idx)
            .chain(std::iter::once(query_lower.len()))
            .collect();
        let num_chars = boundaries.len() - 1;

        let mut relevant = Vec::new();
        let mut seen: std::collections::HashSet<String> = std::collections::HashSet::new();

        for start in 0..num_chars {
            let start_byte = boundaries[start];
            let max_len = max_entity_chars.min(num_chars - start);
            for len in 1..=max_len {
                let end_byte = boundaries[start + len];
                let window = &query_lower[start_byte..end_byte];
                if let Some(original) = entity_index.get(window) {
                    if seen.insert(original.clone()) {
                        relevant.push(original.clone());
                    }
                }
            }
        }

        Ok(relevant)
    }

    /// Generate a context embedding for a conversation by encoding the most
    /// recent messages (bounded by `context_window`) with the held model and
    /// averaging the resulting vectors component-wise.
    pub async fn generate_context_embedding(&self, messages: &[String]) -> Result<Vector> {
        if messages.is_empty() {
            return Err(anyhow!("No messages provided"));
        }

        // Take the last N messages based on context window
        let recent_messages: Vec<String> = messages
            .iter()
            .rev()
            .take(self.context_window)
            .cloned()
            .collect();

        let encoded = self.model.encode(&recent_messages).await?;
        let dim = encoded
            .iter()
            .map(|v| v.len())
            .find(|&len| len > 0)
            .ok_or_else(|| anyhow!("Model returned no non-empty encodings for these messages"))?;

        let mut combined = vec![0.0f32; dim];
        let mut count = 0usize;
        for vector in &encoded {
            if vector.len() != dim {
                // Defensively skip any encoding with a mismatched dimension
                // rather than corrupting the running average.
                continue;
            }
            for (acc, value) in combined.iter_mut().zip(vector.iter()) {
                *acc += value;
            }
            count += 1;
        }

        for value in combined.iter_mut() {
            *value /= count as f32;
        }

        Ok(Vector::new(combined))
    }

    /// Generate personalized embeddings for a user
    pub async fn generate_personalized_embedding(
        &mut self,
        user_id: &str,
        query: &str,
        conversation_history: &[String],
    ) -> Result<Vector> {
        // Get user profile and preferences
        let user_profile = self.personalization.get_user_profile(user_id)?.clone();

        // Apply user preferences to query embedding
        let embeddings = self.model.encode(&[query.to_string()]).await?;
        let base_embedding = Vector::new(embeddings[0].clone());
        let personalized_embedding = self.personalization.apply_user_preferences(
            &base_embedding,
            &user_profile,
            conversation_history,
        )?;

        Ok(personalized_embedding)
    }

    /// Update user profile based on interaction
    pub fn update_user_profile(
        &mut self,
        user_id: &str,
        query: &str,
        response_feedback: Option<f32>,
        interaction_type: InteractionType,
    ) -> Result<()> {
        self.personalization.update_user_profile(
            user_id,
            query,
            response_feedback,
            interaction_type,
        )
    }

    /// Translate query to target language
    pub async fn translate_query(
        &self,
        query: &str,
        source_lang: &str,
        target_lang: &str,
    ) -> Result<String> {
        self.multilingual
            .translate_text(query, source_lang, target_lang)
            .await
    }

    /// Detect language of input text
    pub async fn detect_language(&self, text: &str) -> Result<LanguageDetection> {
        self.multilingual.detect_language(text).await
    }

    /// Generate cross-lingual embeddings
    pub async fn generate_cross_lingual_embedding(
        &self,
        text: &str,
        source_lang: &str,
        target_lang: &str,
    ) -> Result<Vector> {
        self.multilingual
            .generate_cross_lingual_embedding(text, source_lang, target_lang, &*self.model)
            .await
    }

    /// Get multilingual entity alignment
    pub async fn align_entities_across_languages(
        &self,
        entity: &str,
        source_lang: &str,
        target_langs: &[String],
    ) -> Result<HashMap<String, String>> {
        self.multilingual
            .align_entities(entity, source_lang, target_langs)
            .await
    }
}

/// SPARQL integration for query enhancement
pub struct SparqlIntegration {
    #[allow(dead_code)]
    model: Box<dyn EmbeddingModel>,
    #[allow(dead_code)]
    similarity_boost: f32,
}

impl SparqlIntegration {
    /// Create new SPARQL integration
    pub fn new(model: Box<dyn EmbeddingModel>) -> Self {
        Self {
            model,
            similarity_boost: 0.1,
        }
    }

    /// Enhance SPARQL query with similarity-based suggestions
    pub fn enhance_query(&self, sparql_query: &str) -> Result<EnhancedQuery> {
        // Parse basic patterns from SPARQL (simplified)
        let entities = self.extract_entities_from_sparql(sparql_query)?;
        let relations = self.extract_relations_from_sparql(sparql_query)?;

        let mut suggestions = Vec::new();

        // Find similar entities
        for entity in &entities {
            // This would use actual similarity computation
            suggestions.push(QuerySuggestion {
                suggestion_type: SuggestionType::SimilarEntity,
                original: entity.clone(),
                suggested: format!("similar_to_{entity}"),
                confidence: 0.8,
            });
        }

        // Find similar relations
        for relation in &relations {
            suggestions.push(QuerySuggestion {
                suggestion_type: SuggestionType::SimilarRelation,
                original: relation.clone(),
                suggested: format!("similar_to_{relation}"),
                confidence: 0.7,
            });
        }

        Ok(EnhancedQuery {
            original_query: sparql_query.to_string(),
            entities_found: entities,
            relations_found: relations,
            suggestions,
        })
    }

    /// Extract entities from SPARQL query (simplified)
    fn extract_entities_from_sparql(&self, query: &str) -> Result<Vec<String>> {
        // This is a very simplified extraction
        // A real implementation would use a proper SPARQL parser
        let mut entities = Vec::new();

        for line in query.lines() {
            if line.contains("http://") {
                // Extract URIs that might be entities
                if let Some(start) = line.find("http://") {
                    if let Some(end) = line[start..].find(' ') {
                        let uri = &line[start..start + end];
                        entities.push(uri.to_string());
                    }
                }
            }
        }

        Ok(entities)
    }

    /// Extract relations from SPARQL query (simplified)
    fn extract_relations_from_sparql(&self, query: &str) -> Result<Vec<String>> {
        // Simplified relation extraction
        let mut relations = Vec::new();

        for line in query.lines() {
            if line.contains("?") && line.contains("http://") {
                // Look for patterns like "?s <relation> ?o"
                if let Some(start) = line.find('<') {
                    if let Some(end) = line.find('>') {
                        let relation = &line[start + 1..end];
                        relations.push(relation.to_string());
                    }
                }
            }
        }

        Ok(relations)
    }
}

/// Enhanced SPARQL query with suggestions
#[derive(Debug, Clone)]
pub struct EnhancedQuery {
    pub original_query: String,
    pub entities_found: Vec<String>,
    pub relations_found: Vec<String>,
    pub suggestions: Vec<QuerySuggestion>,
}

/// Query enhancement suggestion
#[derive(Debug, Clone)]
pub struct QuerySuggestion {
    pub suggestion_type: SuggestionType,
    pub original: String,
    pub suggested: String,
    pub confidence: f32,
}

/// Types of query suggestions
#[derive(Debug, Clone)]
pub enum SuggestionType {
    SimilarEntity,
    SimilarRelation,
    AlternativePattern,
    ExpansionSuggestion,
}

/// Personalization engine for user-specific embeddings
pub struct PersonalizationEngine {
    user_profiles: HashMap<String, UserProfile>,
    interaction_history: HashMap<String, Vec<UserInteraction>>,
    preference_weights: PreferenceWeights,
}

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

impl PersonalizationEngine {
    pub fn new() -> Self {
        Self {
            user_profiles: HashMap::new(),
            interaction_history: HashMap::new(),
            preference_weights: PreferenceWeights::default(),
        }
    }

    /// Get or create user profile
    pub fn get_user_profile(&mut self, user_id: &str) -> Result<&UserProfile> {
        if !self.user_profiles.contains_key(user_id) {
            let profile = UserProfile::new(user_id.to_string());
            self.user_profiles.insert(user_id.to_string(), profile);
        }

        self.user_profiles
            .get(user_id)
            .ok_or_else(|| anyhow!("Failed to get user profile for {}", user_id))
    }

    /// Apply user preferences to embedding
    pub fn apply_user_preferences(
        &self,
        base_embedding: &Vector,
        user_profile: &UserProfile,
        conversation_history: &[String],
    ) -> Result<Vector> {
        let mut personalized = base_embedding.clone();

        // Apply domain preferences
        for (domain, weight) in &user_profile.domain_preferences {
            if conversation_history.iter().any(|msg| msg.contains(domain)) {
                // Boost embedding components related to preferred domains
                for i in 0..personalized.values.len() {
                    personalized.values[i] *= 1.0 + (weight * self.preference_weights.domain_boost);
                }
            }
        }

        // Apply recent interaction patterns
        let recent_interactions = self.get_recent_interactions(&user_profile.user_id, 10);
        if !recent_interactions.is_empty() {
            let avg_sentiment = recent_interactions
                .iter()
                .map(|i| i.sentiment_score.unwrap_or(0.0))
                .sum::<f32>()
                / recent_interactions.len() as f32;

            // Adjust embedding based on user's typical sentiment
            for i in 0..personalized.values.len() {
                personalized.values[i] *=
                    1.0 + (avg_sentiment * self.preference_weights.sentiment_influence);
            }
        }

        Ok(personalized)
    }

    /// Update user profile based on interaction
    pub fn update_user_profile(
        &mut self,
        user_id: &str,
        query: &str,
        response_feedback: Option<f32>,
        interaction_type: InteractionType,
    ) -> Result<()> {
        let interaction = UserInteraction {
            timestamp: chrono::Utc::now(),
            query: query.to_string(),
            interaction_type,
            response_feedback,
            sentiment_score: self.analyze_query_sentiment(query),
        };

        // Add to interaction history
        self.interaction_history
            .entry(user_id.to_string())
            .or_default()
            .push(interaction.clone());

        // Update user profile
        if let Some(profile) = self.user_profiles.get_mut(user_id) {
            profile.update_from_interaction(&interaction);
        }

        Ok(())
    }

    /// Get recent interactions for a user
    fn get_recent_interactions(&self, user_id: &str, limit: usize) -> Vec<&UserInteraction> {
        self.interaction_history
            .get(user_id)
            .map(|history| history.iter().rev().take(limit).collect())
            .unwrap_or_default()
    }

    /// Simple sentiment analysis for query
    fn analyze_query_sentiment(&self, query: &str) -> Option<f32> {
        let positive_words = ["good", "great", "excellent", "amazing", "wonderful"];
        let negative_words = ["bad", "terrible", "awful", "horrible", "disappointing"];

        let query_lower = query.to_lowercase();
        let positive_count = positive_words
            .iter()
            .filter(|&&word| query_lower.contains(word))
            .count();
        let negative_count = negative_words
            .iter()
            .filter(|&&word| query_lower.contains(word))
            .count();

        if positive_count + negative_count == 0 {
            return None;
        }

        let sentiment = (positive_count as f32 - negative_count as f32)
            / (positive_count + negative_count) as f32;
        Some(sentiment)
    }
}

/// User profile for personalization
#[derive(Debug, Clone)]
pub struct UserProfile {
    pub user_id: String,
    pub domain_preferences: HashMap<String, f32>,
    pub entity_preferences: HashMap<String, f32>,
    pub interaction_patterns: InteractionPatterns,
    pub language_preferences: Vec<String>,
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub last_updated: chrono::DateTime<chrono::Utc>,
}

impl UserProfile {
    pub fn new(user_id: String) -> Self {
        let now = chrono::Utc::now();
        Self {
            user_id,
            domain_preferences: HashMap::new(),
            entity_preferences: HashMap::new(),
            interaction_patterns: InteractionPatterns::default(),
            language_preferences: vec!["en".to_string()],
            created_at: now,
            last_updated: now,
        }
    }

    /// Update profile based on user interaction
    pub fn update_from_interaction(&mut self, interaction: &UserInteraction) {
        self.last_updated = chrono::Utc::now();

        // Update interaction patterns
        self.interaction_patterns.total_interactions += 1;
        match interaction.interaction_type {
            InteractionType::Query => self.interaction_patterns.query_count += 1,
            InteractionType::Feedback => self.interaction_patterns.feedback_count += 1,
            InteractionType::EntityLookup => self.interaction_patterns.entity_lookup_count += 1,
        }

        // Update average sentiment
        if let Some(sentiment) = interaction.sentiment_score {
            let current_avg = self.interaction_patterns.average_sentiment;
            let total = self.interaction_patterns.total_interactions as f32;
            self.interaction_patterns.average_sentiment =
                (current_avg * (total - 1.0) + sentiment) / total;
        }

        // Extract and update domain preferences from query
        self.extract_domain_preferences(&interaction.query);
    }

    /// Extract domain preferences from query text
    fn extract_domain_preferences(&mut self, query: &str) {
        let domains = [
            "science",
            "technology",
            "medicine",
            "business",
            "education",
            "sports",
            "entertainment",
            "politics",
            "history",
            "art",
        ];

        for domain in &domains {
            if query.to_lowercase().contains(domain) {
                #[allow(clippy::unnecessary_to_owned)]
                let current = self.domain_preferences.get(*domain).copied().unwrap_or(0.0);
                self.domain_preferences
                    .insert(domain.to_string(), current + 0.1);
            }
        }
    }
}

/// User interaction patterns
#[derive(Debug, Clone, Default)]
pub struct InteractionPatterns {
    pub total_interactions: u32,
    pub query_count: u32,
    pub feedback_count: u32,
    pub entity_lookup_count: u32,
    pub average_sentiment: f32,
    pub preferred_response_length: Option<usize>,
}

/// Types of user interactions
#[derive(Debug, Clone)]
pub enum InteractionType {
    Query,
    Feedback,
    EntityLookup,
}

/// User interaction record
#[derive(Debug, Clone)]
pub struct UserInteraction {
    pub timestamp: chrono::DateTime<chrono::Utc>,
    pub query: String,
    pub interaction_type: InteractionType,
    pub response_feedback: Option<f32>,
    pub sentiment_score: Option<f32>,
}

/// Weights for preference application
#[derive(Debug, Clone)]
pub struct PreferenceWeights {
    pub domain_boost: f32,
    pub entity_boost: f32,
    pub sentiment_influence: f32,
    pub recency_decay: f32,
}

impl Default for PreferenceWeights {
    fn default() -> Self {
        Self {
            domain_boost: 0.1,
            entity_boost: 0.15,
            sentiment_influence: 0.05,
            recency_decay: 0.95,
        }
    }
}

/// Multilingual support for chat integration
pub struct MultilingualSupport {
    supported_languages: Vec<String>,
    translation_cache: HashMap<String, String>,
    language_models: HashMap<String, LanguageModel>,
}

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

impl MultilingualSupport {
    pub fn new() -> Self {
        Self {
            supported_languages: vec![
                "en".to_string(),
                "es".to_string(),
                "fr".to_string(),
                "de".to_string(),
                "it".to_string(),
                "pt".to_string(),
                "zh".to_string(),
                "ja".to_string(),
                "ko".to_string(),
                "ar".to_string(),
                "hi".to_string(),
                "ru".to_string(),
            ],
            translation_cache: HashMap::new(),
            language_models: HashMap::new(),
        }
    }

    /// Translate text between languages
    pub async fn translate_text(
        &self,
        text: &str,
        source_lang: &str,
        target_lang: &str,
    ) -> Result<String> {
        if source_lang == target_lang {
            return Ok(text.to_string());
        }

        let cache_key = format!("{source_lang}:{target_lang}:{text}");
        if let Some(cached) = self.translation_cache.get(&cache_key) {
            return Ok(cached.clone());
        }

        // Mock translation implementation
        // In practice, this would call a translation service
        let translated = match target_lang {
            "es" => format!("[ES] {text}"),
            "fr" => format!("[FR] {text}"),
            "de" => format!("[DE] {text}"),
            "zh" => format!("[ZH] {text}"),
            _ => format!("[{}] {}", target_lang.to_uppercase(), text),
        };

        Ok(translated)
    }

    /// Detect language of input text
    pub async fn detect_language(&self, text: &str) -> Result<LanguageDetection> {
        // Simple language detection based on common words
        let text_lower = text.to_lowercase();

        let mut scores = HashMap::new();

        // English indicators
        let en_words = ["the", "and", "is", "hello", "world", "of", "to", "in"];
        let en_score = en_words
            .iter()
            .filter(|&&word| text_lower.contains(word))
            .count();
        scores.insert("en", en_score);

        // Spanish indicators
        let es_words = ["el", "y", "es", "hola", "buenos", "dias", "de", "en", "la"];
        let es_score = es_words
            .iter()
            .filter(|&&word| text_lower.contains(word))
            .count();
        scores.insert("es", es_score);

        // French indicators
        let fr_words = ["le", "et", "est", "bonjour", "de", "la", "les"];
        let fr_score = fr_words
            .iter()
            .filter(|&&word| text_lower.contains(word))
            .count();
        scores.insert("fr", fr_score);

        // German indicators
        let de_words = ["der", "und", "ist", "hallo", "von", "die", "das"];
        let de_score = de_words
            .iter()
            .filter(|&&word| text_lower.contains(word))
            .count();
        scores.insert("de", de_score);

        // Find language with highest score
        let detected_lang = scores
            .iter()
            .max_by_key(|&(_, &score)| score)
            .map(|(lang, _)| *lang)
            .unwrap_or("en");

        Ok(LanguageDetection {
            language_code: detected_lang.to_string(),
            confidence: 0.85,
            alternatives: vec![
                ("en".to_string(), 0.7),
                ("es".to_string(), 0.2),
                ("fr".to_string(), 0.1),
            ],
        })
    }

    /// Generate cross-lingual embeddings
    pub async fn generate_cross_lingual_embedding(
        &self,
        text: &str,
        source_lang: &str,
        target_lang: &str,
        model: &dyn EmbeddingModel,
    ) -> Result<Vector> {
        // For cross-lingual embeddings, we would typically:
        // 1. Use a multilingual embedding model
        // 2. Or translate text and generate embedding
        // 3. Or use language-specific models with alignment

        let translated_text = self.translate_text(text, source_lang, target_lang).await?;
        let embeddings = model.encode(&[translated_text]).await?;
        Ok(Vector::new(embeddings[0].clone()))
    }

    /// Align entities across languages
    pub async fn align_entities(
        &self,
        entity: &str,
        source_lang: &str,
        target_langs: &[String],
    ) -> Result<HashMap<String, String>> {
        let mut alignments = HashMap::new();

        for target_lang in target_langs {
            if target_lang == source_lang {
                alignments.insert(target_lang.clone(), entity.to_string());
                continue;
            }

            // Mock entity alignment - in practice would use knowledge bases
            let aligned_entity = match target_lang.as_str() {
                "es" => format!("{entity}_es"),
                "fr" => format!("{entity}_fr"),
                "de" => format!("{entity}_de"),
                "zh" => format!("{entity}_zh"),
                _ => format!("{entity}_{target_lang}"),
            };

            alignments.insert(target_lang.clone(), aligned_entity);
        }

        Ok(alignments)
    }
}

/// Language detection result
#[derive(Debug, Clone)]
pub struct LanguageDetection {
    pub language_code: String,
    pub confidence: f32,
    pub alternatives: Vec<(String, f32)>,
}

/// Language model information
#[derive(Debug, Clone)]
pub struct LanguageModel {
    pub model_id: String,
    pub language_code: String,
    pub model_type: String,
    pub embedding_dimension: usize,
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::models::TransE;
    use crate::ModelConfig;

    #[test]
    fn test_vector_store_bridge() {
        let config = ModelConfig::default().with_dimensions(10);
        let _model = TransE::new(config);

        let bridge = VectorStoreBridge::new();

        // Test URI generation
        let entity_uri = bridge.generate_entity_uri("test_entity");
        assert!(entity_uri.starts_with("kg:entity:"));

        let relation_uri = bridge.generate_relation_uri("test_relation");
        assert!(relation_uri.starts_with("kg:relation:"));
    }

    /// Regression test: `find_similar_entities`/`find_similar_relations` must
    /// return real nearest-neighbor results from the synced embeddings
    /// instead of always an empty `Vec`.
    #[tokio::test]
    async fn test_vector_store_bridge_find_similar_returns_real_results() -> Result<()> {
        let config = ModelConfig::default().with_dimensions(8);
        let mut model = TransE::new(config);

        for (s, p, o) in [
            ("alice", "knows", "bob"),
            ("bob", "knows", "carol"),
            ("carol", "knows", "alice"),
        ] {
            model.add_triple(crate::Triple::new(
                crate::NamedNode::new(s)?,
                crate::NamedNode::new(p)?,
                crate::NamedNode::new(o)?,
            ))?;
        }
        model.train(Some(1)).await?;

        let mut bridge = VectorStoreBridge::new();
        let stats = bridge.sync_model_embeddings(&model)?;
        assert_eq!(stats.entities_synced, 3);
        assert_eq!(stats.relations_synced, 1);
        assert!(stats.errors.is_empty(), "errors = {:?}", stats.errors);

        // Every other entity should be a candidate neighbor for "alice".
        let similar = bridge.find_similar_entities("alice", 2)?;
        assert!(!similar.is_empty(), "expected at least one similar entity");
        assert!(
            similar.iter().all(|(name, _)| name != "alice"),
            "the query entity itself must not appear in its own results: {:?}",
            similar
        );

        // Unknown entity must error rather than silently return empty.
        assert!(bridge.find_similar_entities("nobody", 2).is_err());

        Ok(())
    }

    /// A minimal `EmbeddingModel` whose `encode` deterministically maps text
    /// length to vector values, used to exercise `ChatIntegration` methods
    /// that need real (if simple) text encoding — unlike the KGE models in
    /// `crate::models`, which all reject `encode` outright.
    struct MockTextModel {
        config: ModelConfig,
        model_id: uuid::Uuid,
        entities: Vec<String>,
    }

    impl MockTextModel {
        fn new(dimensions: usize, entities: Vec<String>) -> Self {
            Self {
                config: ModelConfig::default().with_dimensions(dimensions),
                model_id: uuid::Uuid::new_v4(),
                entities,
            }
        }
    }

    #[async_trait::async_trait]
    impl EmbeddingModel for MockTextModel {
        fn config(&self) -> &ModelConfig {
            &self.config
        }
        fn model_id(&self) -> &uuid::Uuid {
            &self.model_id
        }
        fn model_type(&self) -> &'static str {
            "MockText"
        }
        fn add_triple(&mut self, _triple: crate::Triple) -> Result<()> {
            Ok(())
        }
        async fn train(&mut self, _epochs: Option<usize>) -> Result<crate::TrainingStats> {
            Ok(crate::TrainingStats {
                epochs_completed: 1,
                final_loss: 0.0,
                training_time_seconds: 0.0,
                convergence_achieved: true,
                loss_history: vec![0.0],
            })
        }
        fn get_entity_embedding(&self, entity: &str) -> Result<Vector> {
            Ok(Vector::new(vec![
                entity.len() as f32;
                self.config.dimensions
            ]))
        }
        fn get_relation_embedding(&self, relation: &str) -> Result<Vector> {
            Ok(Vector::new(vec![
                relation.len() as f32;
                self.config.dimensions
            ]))
        }
        fn score_triple(&self, _subject: &str, _predicate: &str, _object: &str) -> Result<f64> {
            Ok(0.0)
        }
        fn predict_objects(
            &self,
            _subject: &str,
            _predicate: &str,
            _k: usize,
        ) -> Result<Vec<(String, f64)>> {
            Ok(vec![])
        }
        fn predict_subjects(
            &self,
            _predicate: &str,
            _object: &str,
            _k: usize,
        ) -> Result<Vec<(String, f64)>> {
            Ok(vec![])
        }
        fn predict_relations(
            &self,
            _subject: &str,
            _object: &str,
            _k: usize,
        ) -> Result<Vec<(String, f64)>> {
            Ok(vec![])
        }
        fn get_entities(&self) -> Vec<String> {
            self.entities.clone()
        }
        fn get_relations(&self) -> Vec<String> {
            vec![]
        }
        fn get_stats(&self) -> crate::ModelStats {
            crate::ModelStats {
                num_entities: self.entities.len(),
                dimensions: self.config.dimensions,
                is_trained: true,
                ..Default::default()
            }
        }
        fn save(&self, _path: &str) -> Result<()> {
            Ok(())
        }
        fn load(&mut self, _path: &str) -> Result<()> {
            Ok(())
        }
        fn clear(&mut self) {}
        fn is_trained(&self) -> bool {
            true
        }
        async fn encode(&self, texts: &[String]) -> Result<Vec<Vec<f32>>> {
            Ok(texts
                .iter()
                .map(|t| vec![t.len() as f32; self.config.dimensions])
                .collect())
        }
    }

    /// Regression test: `extract_relevant_entities` must find entities that
    /// appear as a substring of the query using the windowed-index rewrite.
    #[test]
    fn test_extract_relevant_entities_finds_substring_matches() -> Result<()> {
        let model = MockTextModel::new(
            4,
            vec!["alice".to_string(), "bob".to_string(), "carol".to_string()],
        );
        let integration = ChatIntegration::new(Box::new(model));

        let relevant = integration.extract_relevant_entities("Alice met Bob yesterday.")?;
        assert!(relevant.contains(&"alice".to_string()));
        assert!(relevant.contains(&"bob".to_string()));
        assert!(!relevant.contains(&"carol".to_string()));

        Ok(())
    }

    /// Regression test: `generate_context_embedding` must actually encode and
    /// combine the recent messages via the model, instead of returning a
    /// fixed all-zero placeholder vector regardless of input.
    #[tokio::test]
    async fn test_generate_context_embedding_reflects_message_content() -> Result<()> {
        let model = MockTextModel::new(4, vec![]);
        let integration = ChatIntegration::new(Box::new(model));

        let short = integration
            .generate_context_embedding(&["hi".to_string()])
            .await?;
        let long = integration
            .generate_context_embedding(&["a much longer message here".to_string()])
            .await?;

        assert_eq!(short.values.len(), 4);
        assert_ne!(
            short.values, long.values,
            "different message content should produce different context embeddings"
        );

        assert!(integration.generate_context_embedding(&[]).await.is_err());

        Ok(())
    }

    #[test]
    fn test_sparql_integration() -> Result<()> {
        let config = ModelConfig::default().with_dimensions(10);
        let model = TransE::new(config);

        let integration = SparqlIntegration::new(Box::new(model));

        let test_query = "SELECT ?s ?o WHERE { ?s <http://example.org/knows> ?o }";
        let enhanced = integration.enhance_query(test_query)?;

        assert_eq!(enhanced.original_query, test_query);
        assert!(!enhanced.suggestions.is_empty());

        Ok(())
    }

    #[test]
    fn test_personalization_engine() {
        let mut engine = PersonalizationEngine::new();
        let user_id = "test_user";

        // Test user profile creation
        let profile = engine.get_user_profile(user_id).expect("should succeed");
        assert_eq!(profile.user_id, user_id);

        // Test interaction update
        engine
            .update_user_profile(
                user_id,
                "What is machine learning?",
                Some(0.9),
                InteractionType::Query,
            )
            .expect("should succeed");

        let history = engine.get_recent_interactions(user_id, 5);
        assert_eq!(history.len(), 1);
    }

    #[tokio::test]
    async fn test_multilingual_support() -> Result<()> {
        let multilingual = MultilingualSupport::new();

        // Test language detection with English text
        let detection_en = multilingual.detect_language("Hello world").await?;
        assert_eq!(detection_en.language_code, "en");

        // Test language detection with Spanish text
        let detection_es = multilingual.detect_language("Hola y buenos dias").await?;
        assert_eq!(detection_es.language_code, "es");

        // Test translation
        let translated = multilingual
            .translate_text("Hello world", "en", "es")
            .await?;
        assert!(translated.contains("[ES]"));

        // Test entity alignment
        let alignments = multilingual
            .align_entities("person", "en", &["es".to_string(), "fr".to_string()])
            .await?;
        assert_eq!(alignments.len(), 2);

        Ok(())
    }
}