/**
 * Image Manager for handling image storage, caching, and metadata
 */
import { ImageMetadata, GenerationHistory, ServerConfig } from '../types/index.js';
export declare class ImageManager {
    private config;
    private historyFile;
    private storageDir;
    constructor(config: ServerConfig);
    /**
     * Initialize storage directory and history file
     */
    private initializeStorage;
    /**
     * Store image metadata in the history
     */
    storeImageMetadata(metadata: ImageMetadata): Promise<void>;
    /**
     * Get information about a specific image
     */
    getImageInfo(imageId: string): Promise<ImageMetadata | null>;
    /**
     * List recent image generations with optional filtering
     */
    listGenerations(options?: {
        limit?: number;
        offset?: number;
        filter?: string;
    }): Promise<GenerationHistory>;
    /**
     * Save image data to local storage (for base64 responses or URLs)
     */
    saveImageData(imageId: string, data: string, format: 'base64' | 'url'): Promise<string>;
    /**
     * Clean up old images and metadata
     */
    cleanupOldImages(): Promise<void>;
    /**
     * Get storage statistics
     */
    getStorageStats(): Promise<{
        total_images: number;
        storage_size: number;
        oldest_image: number;
        newest_image: number;
    }>;
    /**
     * Load generation history from file
     */
    private loadHistory;
    /**
     * Save generation history to file
     */
    private saveHistory;
    /**
     * Validate image data (basic validation)
     */
    validateImageData(data: string, format: 'base64' | 'url'): boolean;
}