// ==========================================
// MEEZAN - ميزان Knowledge Gap Tracker
// Identifies what Meezan doesn't know well
// and prioritizes what to learn next
// ==========================================

import * as fs from 'fs';
import * as path from 'path';
import { KnowledgeGap } from '../types';

// Topic patterns to detect knowledge domains
const TOPIC_PATTERNS: Array<{
  topic: string;
  topicAr: string;
  category: KnowledgeGap['category'];
  patterns: string[];
}> = [
  // Fiqh topics
  { topic: 'Inheritance (Faraidh)', topicAr: 'الميراث والفرائض', category: 'fiqh',
    patterns: ['ميراث', 'فرائض', 'وصية', 'inheritance', 'faraidh', 'تركة'] },
  { topic: 'Islamic Marriage (Nikah)', topicAr: 'النكاح والزواج', category: 'fiqh',
    patterns: ['نكاح', 'زواج', 'مهر', 'طلاق', 'marriage', 'nikah', 'divorce', 'khul'] },
  { topic: 'Halal Food Details', topicAr: 'تفاصيل الأطعمة الحلال', category: 'fiqh',
    patterns: ['ذبح', 'تذكية', 'مستفسر', 'slaughter', 'zabiha', 'gelatin', 'rennet'] },
  { topic: 'Business Ethics in Islam', topicAr: 'أخلاقيات التجارة الإسلامية', category: 'fiqh',
    patterns: ['غش', 'تدليس', 'عقد', 'بيع', 'شراء', 'fraud', 'contract', 'gharar'] },
  
  // Islamic Finance
  { topic: 'Sukuk Details', topicAr: 'تفاصيل الصكوك', category: 'finance',
    patterns: ['صكوك', 'sukuk', 'islamic bond', 'صك'] },
  { topic: 'Islamic Insurance (Takaful)', topicAr: 'التأمين الإسلامي', category: 'finance',
    patterns: ['تكافل', 'تأمين', 'takaful', 'insurance'] },
  { topic: 'Cryptocurrency in Islam', topicAr: 'العملات الرقمية في الإسلام', category: 'finance',
    patterns: ['بيتكوين', 'كريبتو', 'عملة رقمية', 'bitcoin', 'crypto', 'nft', 'defi', 'web3'] },
  { topic: 'Kuwait Stock Exchange', topicAr: 'بورصة الكويت', category: 'finance',
    patterns: ['بورصة الكويت', 'boursa kuwait', 'كويت للأسهم', 'kuwaitstock', 'tadawul'] },
  
  // Kuwait Government
  { topic: 'Kuwait Visa Process', topicAr: 'إجراءات التأشيرة الكويتية', category: 'government',
    patterns: ['تأشيرة', 'visa', 'iqama', 'إقامة', 'residence permit', 'work permit'] },
  { topic: 'Kuwait Labor Law', topicAr: 'قانون العمل الكويتي', category: 'government',
    patterns: ['عمالة', 'labor', 'employment', 'عقد عمل', 'راتب', 'فصل', 'resignation'] },
  { topic: 'Kuwait VAT / Tax', topicAr: 'الضرائب الكويتية', category: 'government',
    patterns: ['ضريبة', 'vat', 'tax', 'زكاة الشركات', 'corporate tax'] },
  
  // Culture
  { topic: 'Ramadan Practices', topicAr: 'أحكام رمضان', category: 'culture',
    patterns: ['رمضان', 'صيام', 'إفطار', 'سحور', 'fasting', 'ramadan', 'iftar', 'suhoor'] },
  { topic: 'Hajj and Umrah', topicAr: 'الحج والعمرة', category: 'culture',
    patterns: ['حج', 'عمرة', 'مكة', 'hajj', 'umrah', 'mecca', 'ihram'] },
  { topic: 'GCC Cultural Etiquette', topicAr: 'الآداب الخليجية', category: 'culture',
    patterns: ['عادات', 'تقاليد', 'آداب', 'culture', 'etiquette', 'customs', 'خليج'] },
];

export class KnowledgeGapTracker {
  private dbPath: string;
  private gaps: Map<string, KnowledgeGap>;

  constructor(dbPath: string = './data/knowledge_gaps.json') {
    this.dbPath = dbPath;
    this.gaps = new Map();
    this.load();
  }

  /**
   * Analyze a conversation exchange and detect potential knowledge gaps
   */
  analyzeExchange(
    userMessage: string,
    assistantResponse: string,
    wasConfused: boolean,
    wasNegative: boolean
  ): KnowledgeGap[] {
    
    const detectedGaps: KnowledgeGap[] = [];
    
    if (!wasConfused && !wasNegative) return detectedGaps;
    
    const combined = (userMessage + ' ' + assistantResponse).toLowerCase();
    
    for (const topicDef of TOPIC_PATTERNS) {
      const matches = topicDef.patterns.filter(p => combined.includes(p.toLowerCase()));
      
      if (matches.length > 0) {
        const gapId = `gap_${topicDef.topic.replace(/\s+/g, '_').toLowerCase()}`;
        const existing = this.gaps.get(gapId);
        
        if (existing) {
          // Increment frequency
          existing.frequency++;
          existing.lastSeen = new Date().toISOString();
          if (!existing.exampleQuestions.includes(userMessage)) {
            existing.exampleQuestions = [...existing.exampleQuestions.slice(-4), userMessage];
          }
          // Upgrade priority if frequent enough
          if (existing.frequency >= 10 && existing.priority !== 'high') {
            existing.priority = 'high';
          } else if (existing.frequency >= 5 && existing.priority === 'low') {
            existing.priority = 'medium';
          }
          this.gaps.set(gapId, existing);
          detectedGaps.push(existing);
        } else {
          // New gap detected
          const newGap: KnowledgeGap = {
            id: gapId,
            topic: topicDef.topic,
            topicAr: topicDef.topicAr,
            category: topicDef.category,
            frequency: 1,
            firstSeen: new Date().toISOString(),
            lastSeen: new Date().toISOString(),
            exampleQuestions: [userMessage],
            status: 'identified',
            priority: 'low'
          };
          this.gaps.set(gapId, newGap);
          detectedGaps.push(newGap);
        }
      }
    }
    
    if (detectedGaps.length > 0) this.save();
    return detectedGaps;
  }

  /**
   * Get top priority knowledge gaps to address
   */
  getTopGaps(limit: number = 5): KnowledgeGap[] {
    const allGaps = Array.from(this.gaps.values())
      .filter(g => g.status !== 'resolved');
    
    // Sort by priority then frequency
    const priorityScore = (g: KnowledgeGap) => {
      const p = g.priority === 'high' ? 3 : g.priority === 'medium' ? 2 : 1;
      return p * 100 + g.frequency;
    };
    
    return allGaps
      .sort((a, b) => priorityScore(b) - priorityScore(a))
      .slice(0, limit);
  }

  /**
   * Mark a gap as resolved with a resolution note
   */
  resolveGap(gapId: string, resolution: string): void {
    const gap = this.gaps.get(gapId);
    if (gap) {
      gap.status = 'resolved';
      gap.resolution = resolution;
      this.gaps.set(gapId, gap);
      this.save();
    }
  }

  /**
   * Get summary stats for the learning dashboard
   */
  getStats(): {
    total: number;
    high: number;
    medium: number;
    low: number;
    resolved: number;
    topTopics: string[];
  } {
    const all = Array.from(this.gaps.values());
    return {
      total: all.length,
      high: all.filter(g => g.priority === 'high' && g.status !== 'resolved').length,
      medium: all.filter(g => g.priority === 'medium' && g.status !== 'resolved').length,
      low: all.filter(g => g.priority === 'low' && g.status !== 'resolved').length,
      resolved: all.filter(g => g.status === 'resolved').length,
      topTopics: this.getTopGaps(3).map(g => g.topicAr)
    };
  }

  getAllGaps(): KnowledgeGap[] {
    return Array.from(this.gaps.values());
  }

  private load(): void {
    const dir = path.dirname(this.dbPath);
    if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
    
    if (fs.existsSync(this.dbPath)) {
      try {
        const data = JSON.parse(fs.readFileSync(this.dbPath, 'utf-8'));
        for (const gap of data) {
          this.gaps.set(gap.id, gap);
        }
      } catch { /* start fresh */ }
    }
  }

  private save(): void {
    const data = Array.from(this.gaps.values());
    fs.writeFileSync(this.dbPath, JSON.stringify(data, null, 2), 'utf-8');
  }
}

export const knowledgeGapTracker = new KnowledgeGapTracker(
  process.env.DB_PATH?.replace('memory.json', 'knowledge_gaps.json') || './data/knowledge_gaps.json'
);