/**
 * SMI-579: SearchService - FTS5 search with BM25 ranking
 *
 * Features:
 * - Full-text search using SQLite FTS5
 * - BM25 ranking for relevance scoring
 * - Phrase queries and boolean operators
 * - Result highlighting for matched terms
 * - Pagination support
 * - Search caching
 */
import type { Database as DatabaseType } from '../db/database-interface.js';
import type { Skill, SearchOptions, SearchResult, PaginatedResults, TrustTier } from '../types/skill.js';
export type { FTSRow, BooleanSearchTerms, SearchCacheOptions } from './SearchService.types.js';
export { escapeFtsToken, buildFtsQuery, buildHighlights } from './SearchService.helpers.js';
/**
 * Full-text search service with BM25 ranking
 */
export declare class SearchService {
    private db;
    private cache;
    private cacheTtl;
    constructor(db: DatabaseType, options?: {
        cacheTtl?: number;
    });
    /**
     * Search skills using FTS5 with BM25 ranking
     */
    search(options: SearchOptions): PaginatedResults<SearchResult>;
    /**
     * Search with phrase query support
     */
    searchPhrase(phrase: string, options?: Omit<SearchOptions, 'query'>): PaginatedResults<SearchResult>;
    /**
     * Search with boolean operators (AND, OR, NOT)
     */
    searchBoolean(terms: {
        must?: string[];
        should?: string[];
        not?: string[];
    }, options?: Omit<SearchOptions, 'query'>): PaginatedResults<SearchResult>;
    /**
     * Get search suggestions based on partial input
     */
    suggest(prefix: string, limit?: number): string[];
    /**
     * Find similar skills based on a skill's content
     */
    findSimilar(skillId: string, limit?: number): SearchResult[];
    /**
     * Get popular skills by trust tier
     */
    getPopular(trustTier?: TrustTier, limit?: number): Skill[];
    /**
     * Clear the search cache
     */
    clearCache(): number;
    /**
     * ADR-019: Filter-only search when query is empty
     * Queries the skills table directly instead of using FTS5
     */
    private searchByFiltersOnly;
}
//# sourceMappingURL=SearchService.d.ts.map