/**
 * Metadata Extraction Plugin
 * Extract comprehensive metadata from various file types
 *
 * @module @plyaz/storage/plugins/metadata-extraction
 *
 * @example
 * ```typescript
 * import { MetadataExtractionPlugin } from '@plyaz/storage/plugins';
 *
 * const metadataPlugin = new MetadataExtractionPlugin({
 *   extractExif: true,
 *   extractId3: true,
 *   extractVideoMeta: true,
 *   extractDocMeta: true,
 *   stripSensitiveData: true,
 *   priority: 30,
 * });
 * ```
 */
import { BasePlugin } from '../../base/BasePlugin';
import type { StoragePluginContext, StoragePluginHealth, BeforeUploadResult, StoragePluginFile, MetadataExtractionPluginConfig, StorageMetadataExtractionPluginStatistics } from '@plyaz/types/storage';
/**
 * Metadata Extraction Plugin
 * Extract comprehensive metadata from various file types
 *
 * Features:
 * - Image EXIF data (camera, location, date)
 * - Audio ID3 tags (artist, album, genre)
 * - Video metadata (codec, resolution, duration, fps)
 * - Document properties (author, title, page count)
 * - Privacy features (strip GPS, serial numbers)
 */
export declare class MetadataExtractionPlugin extends BasePlugin {
    private readonly extractExif;
    private readonly extractId3;
    private readonly extractVideoMeta;
    private readonly extractDocMeta;
    private readonly stripSensitiveData;
    private readonly preserveOriginal;
    private readonly supportedMimeTypes;
    private filesProcessed;
    private metadataExtracted;
    constructor(config?: MetadataExtractionPluginConfig);
    /**
     * Extract metadata before upload
     */
    beforeUpload(file: StoragePluginFile, _context: StoragePluginContext): Promise<BeforeUploadResult>;
    /**
     * Extract metadata from file based on mime type
     */
    private extractMetadata;
    /**
     * Categorize file based on mime type
     */
    private categorizeFile;
    /**
     * Extract EXIF data from images
     * Uses exifr to extract metadata from images
     */
    private extractExifData;
    /**
     * Extract ID3 tags from audio files
     * Uses music-metadata to extract tags from various audio formats
    // eslint-disable-next-line complexity
     */
    private extractId3Data;
    /**
     * Extract metadata from video files
    // eslint-disable-next-line complexity
     * Uses fluent-ffmpeg to extract video metadata via ffprobe
     */
    private extractVideoMetadata;
    /**
    // eslint-disable-next-line complexity
     * Extract metadata from documents
     * Uses pdf-parse to extract metadata from PDF files
     */
    private extractDocumentMetadata;
    /**
     * Parse frame rate string (e.g., "30/1" -> 30)
     */
    private parseFrameRate;
    /**
     * Strip sensitive metadata (GPS coordinates, serial numbers)
     */
    private stripSensitiveMetadata;
    /**
     * Health check
     */
    healthCheck(): Promise<StoragePluginHealth>;
    /**
     * Get processing statistics
     */
    getStatistics(): StorageMetadataExtractionPluginStatistics;
}