/**
 * RAG Pipeline Orchestrator
 *
 * Provides a complete end-to-end RAG pipeline that orchestrates:
 * - Document loading and preprocessing
 * - Chunking with configurable strategies
 * - Embedding generation
 * - Vector storage and retrieval
 * - Context assembly for LLM queries
 * - Response generation with citations
 *
 * @example
 * ```typescript
 * const pipeline = new RAGPipeline({
 *   vectorStore: myVectorStore,
 *   embeddingModel: { provider: 'openai', modelName: 'text-embedding-3-small' },
 *   generationModel: { provider: 'openai', modelName: 'gpt-4o-mini' }
 * });
 *
 * // Ingest documents
 * await pipeline.ingest(['/path/to/doc1.md', '/path/to/doc2.pdf']);
 *
 * // Query with RAG
 * const response = await pipeline.query('What are the key features?');
 * console.log(response.answer, response.sources);
 * ```
 */
import type { RAGPipelineConfig, IngestOptions, QueryOptions, RAGResponse, PipelineStats, MultiModalRAGConfig, MultiModalQuery, MultiModalSearchResult, DecisionCallerFn } from "../../types/index.js";
import { MDocument } from "../document/MDocument.js";
export declare class RAGPipeline {
    private id;
    private config;
    private vectorStore;
    private bm25Index;
    private graphRAG;
    private embeddingProvider?;
    private multiModalEmbeddingProvider?;
    private generationProvider?;
    /**
     * Vision provider for image captioning, when `multiModal.captionProvider` /
     * `captionModel` name one. Undefined means captioning uses
     * {@link generationProvider} — captioning has always run on that provider,
     * and these two fields were declared but read nowhere, so a caller who set
     * them got the pipeline's generation model with no indication otherwise.
     */
    private captionProvider?;
    private hybridSearch?;
    private documents;
    private allChunks;
    private multiModalConfig?;
    private imageLoader;
    constructor(config: RAGPipelineConfig);
    /**
     * Initialize the pipeline (lazy loading of providers)
     */
    initialize(): Promise<void>;
    /**
     * Ingest documents into the pipeline
     *
     * @param sources - Array of file paths, URLs, or MDocument instances
     * @param options - Ingestion options
     */
    ingest(sources: Array<string | MDocument>, options?: IngestOptions): Promise<{
        documentsProcessed: number;
        chunksCreated: number;
    }>;
    /**
     * Query the pipeline
     *
     * @param query - Search query
     * @param options - Query options
     * @returns RAG response with retrieved context and optional generated answer
     */
    query(query: string, options?: QueryOptions): Promise<RAGResponse>;
    /**
     * Get pipeline statistics
     */
    getStats(): PipelineStats;
    /**
     * Get pipeline ID
     */
    getId(): string;
    /**
     * Clear all indexed data
     */
    clear(): Promise<void>;
    /**
     * Ingest images into the pipeline for multi-modal RAG.
     * Loads images, generates embeddings via the configured multi-modal provider,
     * and stores them alongside text chunks in the vector store.
     *
     * @param sources - Array of image file paths, URLs, or Buffer objects
     * @param options - Ingestion options
     */
    ingestImages(sources: Array<string | Buffer>, options?: IngestOptions): Promise<{
        imagesProcessed: number;
        chunksCreated: number;
    }>;
    /**
     * Query the pipeline with multi-modal input (text, image, or both).
     *
     * @param query - Text, image, or combined query
     * @param options - Query options
     * @returns Array of multi-modal search results
     */
    queryMultiModal(query: MultiModalQuery, options?: QueryOptions): Promise<MultiModalSearchResult[]>;
    /**
     * Get multi-modal pipeline statistics
     */
    getMultiModalStats(): {
        totalImages: number;
        totalTextChunks: number;
        multiModalEnabled: boolean;
    };
    /**
     * Generate a multi-modal embedding for text, image, or both.
     * Uses the configured multi-modal embedding provider (e.g. Bedrock Titan Image).
     */
    private generateMultiModalEmbedding;
    /**
     * Generate a caption for an image using the generation provider's vision model.
     */
    private generateImageCaption;
    /**
     * Diversify multi-modal results to ensure a mix of text and image results.
     */
    private diversifyMultiModalResults;
    /**
     * Ensure pipeline is initialized
     */
    private ensureInitialized;
    /**
     * Generate embedding for text
     */
    private generateEmbedding;
    /**
     * Assemble context from results
     */
    private assembleContext;
    /**
     * Generate answer using LLM
     */
    private generateAnswer;
}
/**
 * Create a simple RAG pipeline with sensible defaults
 *
 * @param options - Basic configuration options
 * @returns Configured RAGPipeline instance
 */
export declare function createRAGPipeline(options: {
    provider?: string;
    embeddingModel?: string;
    generationModel?: string;
    enableHybrid?: boolean;
    enableGraph?: boolean;
    multiModal?: MultiModalRAGConfig;
    /** Fail-open decision caller for per-query retrieval planning. */
    decide?: DecisionCallerFn;
}): RAGPipeline;