/**
 * Document Index — Storage and search for indexed doc chunks
 *
 * Supports two backends:
 * - Free tier: Local JSON file with BM25 keyword search
 * - Pro/dev tier: In-memory vector index with embeddings
 *
 * Follows the same patterns as local-vector-search.ts and local-file-storage.ts
 */
import type { DocChunk } from "./doc-chunker.js";
export interface IndexedDocChunk {
    id: string;
    file_path: string;
    chunk_index: number;
    title: string;
    section_title: string;
    category: string;
    content: string;
    file_hash: string;
    project: string;
    embedding?: number[];
    indexed_at: string;
}
export interface DocSearchResult {
    id: string;
    file_path: string;
    chunk_index: number;
    title: string;
    section_title: string;
    category: string;
    content: string;
    similarity: number;
    project: string;
}
export interface IndexStats {
    total_chunks: number;
    total_files: number;
    files_indexed: string[];
    categories: Record<string, number>;
    project: string;
    has_embeddings: boolean;
}
/**
 * Index doc chunks into storage.
 *
 * - Removes old chunks for the same project + file_path
 * - Generates embeddings if available (pro/dev tier)
 * - Stores to local JSON file
 * - Loads into in-memory vector index if embeddings present
 *
 * Returns count of chunks indexed.
 */
export declare function indexChunks(chunks: DocChunk[], project: string, options?: {
    batchSize?: number;
}): Promise<{
    indexed: number;
    embedded: number;
    errors: number;
}>;
/**
 * Search indexed docs using semantic similarity (pro/dev) or BM25 (free)
 */
export declare function searchDocs(query: string, options?: {
    project?: string;
    category?: string;
    match_count?: number;
}): Promise<DocSearchResult[]>;
/**
 * Get index statistics
 */
export declare function getIndexStats(project?: string): IndexStats;
/**
 * Check which files have changed since last index (by hash)
 */
export declare function getChangedFiles(fileHashes: Map<string, string>, project: string): {
    changed: string[];
    unchanged: string[];
    new_files: string[];
};
/**
 * Initialize vector index from local storage on startup
 */
export declare function initDocVectorIndex(): void;
/**
 * Clear the doc index for a project (or all)
 */
export declare function clearDocIndex(project?: string): number;
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