/**
 * Meilisearch indexer for search functionality
 */

import meilisearch from '../config/meilisearch.js';
import { Service } from '../models/Service.js';
import { Analysis } from '../models/Analysis.js';

const INDEX_NAME = 'services';

export class SearchIndexer {
  static index = null;

  /**
   * Initialize the search index
   */
  static async init() {
    try {
      console.log('Initializing Meilisearch...');
      
      // Check if index exists
      const indexes = await meilisearch.getIndexes();
      const indexExists = indexes.results.some(idx => idx.uid === INDEX_NAME);
      
      if (!indexExists) {
        console.log('Creating search index...');
        await meilisearch.createIndex(INDEX_NAME, { primaryKey: 'id' });
      }
      
      this.index = meilisearch.index(INDEX_NAME);
      
      // Configure searchable attributes
      await this.index.updateSettings({
        searchableAttributes: [
          'name',
          'findings.positive.title',
          'findings.positive.description',
          'findings.negative.title',
          'findings.negative.description',
          'data_types_collected',
          'third_parties.name'
        ],
        filterableAttributes: ['grade', 'overall_score'],
        sortableAttributes: ['name', 'created_at', 'overall_score'],
        rankingRules: [
          'words',
          'typo',
          'proximity',
          'attribute',
          'sort',
          'exactness'
        ]
      });
      
      console.log('Meilisearch initialized successfully');
    } catch (error) {
      console.error('Meilisearch initialization error:', error);
      throw error;
    }
  }

  /**
   * Index a single service
   * @param {Object} service - Service with analysis
   */
  static async indexService(service) {
    try {
      if (!this.index) {
        await this.init();
      }

      const document = {
        id: service.id,
        name: service.name,
        url: service.url,
        logo_url: service.logo_url,
        grade: service.grade,
        overall_score: service.overall_score,
        findings: service.findings || { positive: [], negative: [], neutral: [] },
        data_types_collected: service.data_types_collected || [],
        third_parties: service.third_parties || [],
        last_analyzed: service.last_analyzed,
        created_at: service.created_at
      };

      await this.index.addDocuments([document]);
      console.log(`Indexed service: ${service.name}`);
    } catch (error) {
      console.error(`Failed to index service ${service.name}:`, error);
      throw error;
    }
  }

  /**
   * Index all services
   */
  static async indexAll() {
    try {
      console.log('Indexing all services...');
      
      const services = await Service.findAllWithLatestAnalysis();
      
      const documents = services.map(service => ({
        id: service.id,
        name: service.name,
        url: service.url,
        logo_url: service.logo_url,
        grade: service.grade,
        overall_score: service.overall_score,
        findings: service.findings || { positive: [], negative: [], neutral: [] },
        data_types_collected: service.data_types_collected || [],
        third_parties: service.third_parties || [],
        last_analyzed: service.last_analyzed,
        created_at: service.created_at
      }));

      if (documents.length > 0) {
        await this.index.addDocuments(documents);
        console.log(`Indexed ${documents.length} services`);
      }
      
      return { indexed: documents.length };
    } catch (error) {
      console.error('Bulk indexing error:', error);
      throw error;
    }
  }

  /**
   * Search services
   * @param {string} query - Search query
   * @param {Object} options - Search options
   */
  static async search(query, options = {}) {
    try {
      if (!this.index) {
        await this.init();
      }

      const searchOptions = {
        limit: options.limit || 25,
        offset: options.offset || 0,
        ...options
      };

      const results = await this.index.search(query, searchOptions);
      return results;
    } catch (error) {
      console.error('Search error:', error);
      throw error;
    }
  }

  /**
   * Delete a service from the index
   * @param {number} serviceId - Service ID
   */
  static async deleteService(serviceId) {
    try {
      if (!this.index) {
        await this.init();
      }

      await this.index.deleteDocument(serviceId);
      console.log(`Deleted service ${serviceId} from index`);
    } catch (error) {
      console.error(`Failed to delete service ${serviceId}:`, error);
      throw error;
    }
  }

  /**
   * Get index stats
   */
  static async getStats() {
    try {
      if (!this.index) {
        await this.init();
      }

      const stats = await this.index.getStats();
      return stats;
    } catch (error) {
      console.error('Failed to get stats:', error);
      throw error;
    }
  }
}