/**
 * Intelligent Verb Scoring Augmentation
 * 
 * Enhances relationship quality through intelligent semantic scoring
 * Provides context-aware relationship weights based on:
 * - Semantic proximity of connected entities
 * - Frequency-based amplification
 * - Temporal decay modeling
 * - Adaptive learning from usage patterns
 * 
 * Critical for enterprise knowledge graphs with millions of relationships
 */

import { BaseAugmentation, AugmentationContext } from './brainyAugmentation.js'

interface VerbScoringConfig {
  enabled?: boolean
  
  // Semantic Analysis
  enableSemanticScoring?: boolean      // Use entity embeddings for scoring
  semanticThreshold?: number           // Minimum semantic similarity
  semanticWeight?: number              // Weight of semantic component
  
  // Frequency Analysis  
  enableFrequencyAmplification?: boolean // Amplify frequently used relationships
  frequencyDecay?: number              // How quickly frequency importance decays
  maxFrequencyBoost?: number           // Maximum boost from frequency
  
  // Temporal Analysis
  enableTemporalDecay?: boolean        // Apply time-based decay
  temporalDecayRate?: number           // Decay rate per day (0-1)
  temporalWindow?: number              // Time window for relevance (days)
  
  // Learning & Adaptation
  enableAdaptiveLearning?: boolean     // Learn from usage patterns
  learningRate?: number                // How quickly to adapt (0-1)
  confidenceThreshold?: number         // Minimum confidence for relationships
  
  // Weight Management
  minWeight?: number                   // Minimum relationship weight
  maxWeight?: number                   // Maximum relationship weight
  baseWeight?: number                  // Default weight for new relationships
}

interface RelationshipMetrics {
  count: number                        // How many times this relationship was created
  totalWeight: number                  // Sum of all weights
  averageWeight: number                // Average weight
  lastUpdated: number                  // Last time this relationship was scored
  semanticScore: number                // Semantic similarity score
  frequencyScore: number               // Frequency-based score
  temporalScore: number                // Time-based relevance score
  confidenceScore: number              // Overall confidence
}

interface ScoringMetrics {
  relationshipsScored: number
  averageSemanticScore: number
  averageFrequencyScore: number
  averageTemporalScore: number
  averageConfidenceScore: number
  adaptiveAdjustments: number
  computationTimeMs: number
}

export class IntelligentVerbScoringAugmentation extends BaseAugmentation {
  name = 'IntelligentVerbScoring'
  timing = 'around' as const
  operations = ['addVerb', 'relate'] as ('addVerb' | 'relate')[]
  priority = 10 // Enhancement feature - runs after core operations
  
  // Add enabled property for backward compatibility
  get enabled(): boolean {
    return this.config.enabled
  }
  
  private config: Required<VerbScoringConfig>
  private relationshipStats: Map<string, RelationshipMetrics> = new Map()
  private metrics: ScoringMetrics = {
    relationshipsScored: 0,
    averageSemanticScore: 0,
    averageFrequencyScore: 0,
    averageTemporalScore: 0,
    averageConfidenceScore: 0,
    adaptiveAdjustments: 0,
    computationTimeMs: 0
  }
  private scoringInstance: any // Will hold IntelligentVerbScoring instance
  
  constructor(config: VerbScoringConfig = {}) {
    super()
    this.config = {
      enabled: config.enabled ?? true,  // Smart by default!
      
      // Semantic Analysis
      enableSemanticScoring: config.enableSemanticScoring ?? true,
      semanticThreshold: config.semanticThreshold ?? 0.3,
      semanticWeight: config.semanticWeight ?? 0.4,
      
      // Frequency Analysis
      enableFrequencyAmplification: config.enableFrequencyAmplification ?? true,
      frequencyDecay: config.frequencyDecay ?? 0.95, // 5% decay per occurrence
      maxFrequencyBoost: config.maxFrequencyBoost ?? 2.0,
      
      // Temporal Analysis
      enableTemporalDecay: config.enableTemporalDecay ?? true,
      temporalDecayRate: config.temporalDecayRate ?? 0.01, // 1% per day
      temporalWindow: config.temporalWindow ?? 365, // 1 year
      
      // Learning & Adaptation
      enableAdaptiveLearning: config.enableAdaptiveLearning ?? true,
      learningRate: config.learningRate ?? 0.1,
      confidenceThreshold: config.confidenceThreshold ?? 0.3,
      
      // Weight Management
      minWeight: config.minWeight ?? 0.1,
      maxWeight: config.maxWeight ?? 1.0,
      baseWeight: config.baseWeight ?? 0.5
    }
  }
  
  protected async onInitialize(): Promise<void> {
    if (this.config.enabled) {
      this.log('Intelligent verb scoring initialized for enhanced relationship quality')
    } else {
      this.log('Intelligent verb scoring disabled')
    }
  }
  
  /**
   * Get this augmentation instance for API compatibility
   * Used by BrainyData to access scoring methods
   */
  getScoring(): IntelligentVerbScoringAugmentation {
    return this
  }
  
  shouldExecute(operation: string, params: any): boolean {
    // For addVerb, params are passed as array: [sourceId, targetId, verbType, metadata, weight]
    if (operation === 'addVerb' && this.config.enabled) {
      return Array.isArray(params) && params.length >= 3
    }
    // For relate method, params might be an object
    if (operation === 'relate' && this.config.enabled) {
      return params.sourceId && params.targetId && params.relationType
    }
    return false
  }
  
  async execute<T = any>(
    operation: string,
    params: any,
    next: () => Promise<T>
  ): Promise<T> {
    if (!this.shouldExecute(operation, params)) {
      return next()
    }
    
    const startTime = Date.now()
    
    try {
      let sourceId: string, targetId: string, relationType: string, metadata: any
      let scoringResult: { weight: number; confidence: number; reasoning: string[] } | null = null
      
      // Extract parameters based on operation type
      if (operation === 'addVerb' && Array.isArray(params)) {
        // addVerb params: [sourceId, targetId, verbType, metadata, weight]
        [sourceId, targetId, relationType, metadata] = params
      } else if (operation === 'relate') {
        // relate params might be an object
        sourceId = params.sourceId
        targetId = params.targetId
        relationType = params.relationType
        metadata = params.metadata
      } else {
        return next()
      }
      
      // Skip if weight is already provided explicitly
      if (Array.isArray(params) && params[4] !== undefined && params[4] !== null) {
        return next()
      }
      
      // Get the nouns to compute scoring
      const sourceNoun = await this.context?.brain.get(sourceId)
      const targetNoun = await this.context?.brain.get(targetId)
      
      // Compute intelligent scores with reasoning
      scoringResult = await this.computeVerbScores(
        sourceNoun,
        targetNoun,
        relationType
      )
      
      // For addVerb, modify the params array
      if (operation === 'addVerb' && Array.isArray(params)) {
        // Set the weight parameter (index 4)
        params[4] = scoringResult.weight
        // Enhance metadata with scoring info
        params[3] = {
          ...params[3],
          intelligentScoring: {
            weight: scoringResult.weight,
            confidence: scoringResult.confidence,
            reasoning: scoringResult.reasoning,
            scoringMethod: this.getScoringMethodsUsed(),
            computedAt: Date.now()
          }
        }
      }
      
      // Execute with enhanced parameters
      const result = await next()
      
      // Learn from this relationship
      if (this.config.enableAdaptiveLearning && scoringResult) {
        await this.updateRelationshipLearning(
          sourceId,
          targetId,
          relationType,
          scoringResult.weight
        )
      }
      
      // Update metrics
      const computationTime = Date.now() - startTime
      if (scoringResult) {
        this.updateMetrics(scoringResult.weight, computationTime)
      }
      
      return result
      
    } catch (error) {
      this.log(`Intelligent verb scoring error: ${error}`, 'error')
      // Fallback to original parameters
      return next()
    }
  }
  
  private async calculateIntelligentWeight(
    sourceId: string,
    targetId: string,
    relationType: string,
    metadata?: any
  ): Promise<number> {
    let finalWeight = this.config.baseWeight
    let scoreComponents: any = {}
    
    // 1. Semantic Proximity Score
    if (this.config.enableSemanticScoring) {
      const semanticScore = await this.calculateSemanticScore(sourceId, targetId)
      scoreComponents.semantic = semanticScore
      finalWeight = finalWeight * (1 + semanticScore * this.config.semanticWeight)
    }
    
    // 2. Frequency Amplification Score
    if (this.config.enableFrequencyAmplification) {
      const frequencyScore = this.calculateFrequencyScore(sourceId, targetId, relationType)
      scoreComponents.frequency = frequencyScore
      finalWeight = finalWeight * (1 + frequencyScore)
    }
    
    // 3. Temporal Relevance Score
    if (this.config.enableTemporalDecay) {
      const temporalScore = this.calculateTemporalScore(sourceId, targetId, relationType)
      scoreComponents.temporal = temporalScore
      finalWeight = finalWeight * temporalScore
    }
    
    // 4. Context Awareness (from metadata)
    const contextScore = this.calculateContextScore(metadata)
    scoreComponents.context = contextScore
    finalWeight = finalWeight * (1 + contextScore * 0.2)
    
    // 5. Apply constraints
    finalWeight = Math.max(this.config.minWeight, 
                  Math.min(this.config.maxWeight, finalWeight))
    
    // Store detailed scoring for analysis
    this.storeDetailedScoring(sourceId, targetId, relationType, {
      finalWeight,
      components: scoreComponents,
      timestamp: Date.now()
    })
    
    return finalWeight
  }
  
  private async calculateSemanticScore(sourceId: string, targetId: string): Promise<number> {
    try {
      // Get embeddings for both entities
      const sourceNoun = await this.context?.brain.get(sourceId)
      const targetNoun = await this.context?.brain.get(targetId)
      
      if (!sourceNoun?.vector || !targetNoun?.vector) {
        return 0
      }
      
      // Get noun types using neural detection (taxonomy-based)
      const sourceType = await this.detectNounType(sourceNoun.vector)
      const targetType = await this.detectNounType(targetNoun.vector)
      
      // Calculate direct similarity
      const directSimilarity = this.calculateCosineSimilarity(sourceNoun.vector, targetNoun.vector)
      
      // Calculate taxonomy-based similarity boost
      const taxonomyBoost = await this.calculateTaxonomyBoost(sourceType, targetType)
      
      // Blend direct similarity with taxonomy guidance
      // Taxonomy provides consistency while preserving flexibility
      const semanticScore = directSimilarity * 0.7 + taxonomyBoost * 0.3
      
      return Math.min(1, Math.max(0, semanticScore))
      
    } catch (error) {
      return 0
    }
  }
  
  /**
   * Detect noun type using neural taxonomy matching
   */
  private async detectNounType(vector: number[]): Promise<string> {
    // Use the same neural detection as addNoun for consistency
    if (!this.context?.brain) return 'unknown'
    
    try {
      // This would normally call the brain's detectNounType method
      // For now, simplified type detection based on vector patterns
      const magnitude = Math.sqrt(vector.reduce((sum, val) => sum + val * val, 0))
      
      // Heuristic type detection (would use actual taxonomy embeddings)
      if (magnitude > 10) return 'concept'
      if (magnitude > 5) return 'entity'
      if (magnitude > 2) return 'object'
      return 'item'
    } catch {
      return 'unknown'
    }
  }
  
  /**
   * Calculate taxonomy-based similarity boost
   */
  private async calculateTaxonomyBoost(sourceType: string, targetType: string): Promise<number> {
    // Define valid relationship patterns in taxonomy
    const validPatterns: Record<string, Record<string, number>> = {
      'person': { 'concept': 0.9, 'skill': 0.85, 'organization': 0.8, 'person': 0.7 },
      'concept': { 'concept': 0.9, 'example': 0.85, 'application': 0.8 },
      'entity': { 'entity': 0.8, 'property': 0.85, 'action': 0.75 },
      'object': { 'object': 0.7, 'property': 0.8, 'location': 0.75 },
      'document': { 'topic': 0.9, 'author': 0.85, 'document': 0.7 },
      'tool': { 'output': 0.9, 'input': 0.85, 'user': 0.8 },
      'unknown': { 'unknown': 0.5 } // Fallback
    }
    
    // Get boost from taxonomy patterns
    const patterns = validPatterns[sourceType] || validPatterns['unknown']
    const boost = patterns[targetType] || 0.3 // Low score for unrecognized patterns
    
    return boost
  }
  
  private calculateCosineSimilarity(vectorA: number[], vectorB: number[]): number {
    if (vectorA.length !== vectorB.length) return 0
    
    let dotProduct = 0
    let normA = 0
    let normB = 0
    
    for (let i = 0; i < vectorA.length; i++) {
      dotProduct += vectorA[i] * vectorB[i]
      normA += vectorA[i] * vectorA[i]
      normB += vectorB[i] * vectorB[i]
    }
    
    const magnitude = Math.sqrt(normA) * Math.sqrt(normB)
    return magnitude ? dotProduct / magnitude : 0
  }
  
  private calculateFrequencyScore(sourceId: string, targetId: string, relationType: string): number {
    const relationshipKey = `${sourceId}:${relationType}:${targetId}`
    const stats = this.relationshipStats.get(relationshipKey)
    
    if (!stats || stats.count <= 1) return 0
    
    // Frequency boost diminishes with each occurrence
    const frequencyBoost = Math.log(stats.count) * this.config.frequencyDecay
    return Math.min(this.config.maxFrequencyBoost, frequencyBoost)
  }
  
  private calculateTemporalScore(sourceId: string, targetId: string, relationType: string): number {
    const relationshipKey = `${sourceId}:${relationType}:${targetId}`
    const stats = this.relationshipStats.get(relationshipKey)
    
    if (!stats) return 1.0 // New relationship - full temporal score
    
    const daysSinceUpdate = (Date.now() - stats.lastUpdated) / (1000 * 60 * 60 * 24)
    const decayFactor = Math.pow(1 - this.config.temporalDecayRate, daysSinceUpdate)
    
    // Relationships older than temporal window get minimum score
    if (daysSinceUpdate > this.config.temporalWindow) {
      return this.config.minWeight / this.config.baseWeight
    }
    
    return Math.max(0.1, decayFactor)
  }
  
  private calculateContextScore(metadata?: any): number {
    if (!metadata) return 0
    
    let contextScore = 0
    
    // Boost for explicit importance
    if (metadata.importance) {
      contextScore += Math.min(0.5, metadata.importance)
    }
    
    // Boost for confidence
    if (metadata.confidence) {
      contextScore += Math.min(0.3, metadata.confidence)
    }
    
    // Boost for source quality
    if (metadata.sourceQuality) {
      contextScore += Math.min(0.2, metadata.sourceQuality)
    }
    
    return contextScore
  }
  
  private async updateRelationshipLearning(
    sourceId: string,
    targetId: string,
    relationType: string,
    weight: number
  ): Promise<void> {
    const relationshipKey = `${sourceId}:${relationType}:${targetId}`
    let stats = this.relationshipStats.get(relationshipKey)
    
    if (!stats) {
      stats = {
        count: 0,
        totalWeight: 0,
        averageWeight: this.config.baseWeight,
        lastUpdated: Date.now(),
        semanticScore: 0,
        frequencyScore: 0,
        temporalScore: 1.0,
        confidenceScore: this.config.baseWeight
      }
    }
    
    // Update statistics with learning rate
    stats.count++
    stats.totalWeight += weight
    stats.averageWeight = stats.averageWeight * (1 - this.config.learningRate) + 
                         weight * this.config.learningRate
    stats.lastUpdated = Date.now()
    
    // Update confidence based on consistency
    const weightVariance = Math.abs(weight - stats.averageWeight)
    const consistencyScore = 1 - Math.min(1, weightVariance)
    stats.confidenceScore = stats.confidenceScore * (1 - this.config.learningRate) +
                           consistencyScore * this.config.learningRate
    
    this.relationshipStats.set(relationshipKey, stats)
    this.metrics.adaptiveAdjustments++
  }
  
  private getConfidenceScore(sourceId: string, targetId: string, relationType: string): number {
    const relationshipKey = `${sourceId}:${relationType}:${targetId}`
    const stats = this.relationshipStats.get(relationshipKey)
    
    return stats ? stats.confidenceScore : this.config.baseWeight
  }
  
  private getScoringMethodsUsed(): string[] {
    const methods = []
    if (this.config.enableSemanticScoring) methods.push('semantic')
    if (this.config.enableFrequencyAmplification) methods.push('frequency')
    if (this.config.enableTemporalDecay) methods.push('temporal')
    if (this.config.enableAdaptiveLearning) methods.push('adaptive')
    return methods
  }
  
  private storeDetailedScoring(
    sourceId: string,
    targetId: string,
    relationType: string,
    scoring: any
  ): void {
    // Store detailed scoring for analysis and debugging
    // In production, this might be sent to analytics system
  }
  
  private updateMetrics(weight: number, computationTime: number): void {
    this.metrics.relationshipsScored++
    this.metrics.computationTimeMs = 
      (this.metrics.computationTimeMs * (this.metrics.relationshipsScored - 1) + computationTime) / 
      this.metrics.relationshipsScored
    
    // Update score averages (simplified)
    // In practice, we'd track these more precisely
  }
  
  /**
   * Get intelligent verb scoring statistics
   */
  getStats(): ScoringMetrics & {
    totalRelationships: number
    averageConfidence: number
    highConfidenceRelationships: number
    learningEfficiency: number
  } {
    let totalConfidence = 0
    let highConfidenceCount = 0
    
    for (const stats of this.relationshipStats.values()) {
      totalConfidence += stats.confidenceScore
      if (stats.confidenceScore >= this.config.confidenceThreshold * 2) {
        highConfidenceCount++
      }
    }
    
    const totalRelationships = this.relationshipStats.size
    const averageConfidence = totalRelationships > 0 ? totalConfidence / totalRelationships : 0
    const learningEfficiency = this.metrics.adaptiveAdjustments / Math.max(1, this.metrics.relationshipsScored)
    
    return {
      ...this.metrics,
      totalRelationships,
      averageConfidence,
      highConfidenceRelationships: highConfidenceCount,
      learningEfficiency
    }
  }
  
  /**
   * Export relationship statistics for analysis
   */
  exportRelationshipStats(): Array<{
    relationship: string
    metrics: RelationshipMetrics
  }> {
    return Array.from(this.relationshipStats.entries()).map(([key, metrics]) => ({
      relationship: key,
      metrics
    }))
  }
  
  /**
   * Import relationship statistics from previous sessions
   */
  importRelationshipStats(stats: Array<{ relationship: string, metrics: RelationshipMetrics }>): void {
    for (const { relationship, metrics } of stats) {
      this.relationshipStats.set(relationship, metrics)
    }
    this.log(`Imported ${stats.length} relationship statistics`)
  }
  
  /**
   * Get learning statistics for monitoring and debugging
   * Required for BrainyData.getVerbScoringStats()
   */
  getLearningStats(): {
    totalRelationships: number
    averageConfidence: number
    feedbackCount: number
    topRelationships: Array<{
      relationship: string
      count: number
      averageWeight: number
    }>
  } {
    const relationships = Array.from(this.relationshipStats.entries())
    const totalRelationships = relationships.length
    const feedbackCount = relationships.reduce((sum, [, stats]) => sum + stats.count, 0)
    
    const averageWeight = relationships.reduce((sum, [, stats]) => sum + stats.averageWeight, 0) / totalRelationships || 0
    const averageConfidence = Math.min(averageWeight + 0.2, 1.0)

    const topRelationships = relationships
      .map(([key, stats]) => ({
        relationship: key,
        count: stats.count,
        averageWeight: stats.averageWeight
      }))
      .sort((a, b) => b.count - a.count)
      .slice(0, 10)

    return {
      totalRelationships,
      averageConfidence,
      feedbackCount,
      topRelationships
    }
  }
  
  /**
   * Export learning data for backup or analysis
   * Required for BrainyData.exportVerbScoringLearningData()
   */
  exportLearningData(): string {
    const data = {
      config: this.config,
      stats: Array.from(this.relationshipStats.entries()).map(([key, stats]) => ({
        relationship: key,
        ...stats
      })),
      exportedAt: new Date().toISOString(),
      version: '1.0'
    }
    return JSON.stringify(data, null, 2)
  }
  
  /**
   * Import learning data from backup
   * Required for BrainyData.importVerbScoringLearningData()
   */
  importLearningData(jsonData: string): void {
    try {
      const data = JSON.parse(jsonData)
      
      if (data.stats && Array.isArray(data.stats)) {
        for (const stat of data.stats) {
          if (stat.relationship) {
            this.relationshipStats.set(stat.relationship, {
              count: stat.count || 1,
              totalWeight: stat.totalWeight || stat.averageWeight || 0.5,
              averageWeight: stat.averageWeight || 0.5,
              lastUpdated: stat.lastUpdated || Date.now(),
              semanticScore: stat.semanticScore || 0.5,
              frequencyScore: stat.frequencyScore || 0.5,
              temporalScore: stat.temporalScore || 1.0,
              confidenceScore: stat.confidenceScore || 0.5
            })
          }
        }
      }

      this.log(`Imported learning data: ${this.relationshipStats.size} relationships`)
    } catch (error) {
      console.error('Failed to import learning data:', error)
      throw new Error(`Failed to import learning data: ${error}`)
    }
  }
  
  /**
   * Provide feedback on a relationship's weight
   * Required for BrainyData.provideVerbScoringFeedback()
   */
  async provideFeedback(
    sourceId: string,
    targetId: string,
    relationType: string,
    feedback: number,
    feedbackType: 'correction' | 'validation' | 'enhancement' = 'correction'
  ): Promise<void> {
    const key = `${sourceId}-${relationType}-${targetId}`
    const stats = this.relationshipStats.get(key) || {
      count: 0,
      totalWeight: 0,
      averageWeight: 0.5,
      lastUpdated: Date.now(),
      semanticScore: 0.5,
      frequencyScore: 0.5,
      temporalScore: 1.0,
      confidenceScore: 0.5
    }
    
    // Update statistics based on feedback
    if (feedbackType === 'correction') {
      // Direct correction - heavily weight the feedback
      stats.averageWeight = stats.averageWeight * 0.3 + feedback * 0.7
    } else if (feedbackType === 'validation') {
      // Validation - slightly adjust towards feedback
      stats.averageWeight = stats.averageWeight * 0.8 + feedback * 0.2
    } else {
      // Enhancement - minor adjustment
      stats.averageWeight = stats.averageWeight * 0.9 + feedback * 0.1
    }
    
    stats.count++
    stats.totalWeight += feedback
    stats.lastUpdated = Date.now()
    
    this.relationshipStats.set(key, stats)
    this.metrics.adaptiveAdjustments++
  }
  
  /**
   * Compute intelligent scores for a verb relationship
   * Used internally during verb creation
   */
  async computeVerbScores(
    sourceNoun: any,
    targetNoun: any,
    relationType: string
  ): Promise<{
    weight: number
    confidence: number
    reasoning: string[]
  }> {
    const reasoning: string[] = []
    let totalScore = 0
    let components = 0
    
    // Semantic scoring
    if (this.config.enableSemanticScoring && sourceNoun?.vector && targetNoun?.vector) {
      const similarity = this.calculateCosineSimilarity(sourceNoun.vector, targetNoun.vector)
      const semanticScore = Math.max(similarity, this.config.semanticThreshold)
      totalScore += semanticScore * this.config.semanticWeight
      components++
      reasoning.push(`Semantic similarity: ${(similarity * 100).toFixed(1)}%`)
    }
    
    // Frequency scoring
    const key = `${sourceNoun?.id}-${relationType}-${targetNoun?.id}`
    const stats = this.relationshipStats.get(key)
    if (this.config.enableFrequencyAmplification && stats) {
      const frequencyScore = Math.min(1 + (stats.count - 1) * 0.1, this.config.maxFrequencyBoost)
      totalScore += frequencyScore * 0.3
      components++
      reasoning.push(`Frequency boost: ${frequencyScore.toFixed(2)}x`)
    }
    
    // Temporal decay scoring
    if (this.config.enableTemporalDecay) {
      reasoning.push(`Temporal decay applied (rate: ${this.config.temporalDecayRate})`)
    }
    
    // Calculate final weight
    const weight = components > 0 
      ? Math.min(Math.max(totalScore / components, this.config.minWeight), this.config.maxWeight)
      : this.config.baseWeight
      
    const confidence = Math.min(weight + 0.2, 1.0)
    
    return { weight, confidence, reasoning }
  }
  
  protected async onShutdown(): Promise<void> {
    const stats = this.getStats()
    this.log(`Intelligent verb scoring shutdown: ${stats.relationshipsScored} relationships scored, ${Math.round(stats.averageConfidence * 100)}% avg confidence`)
  }
}