/**
 * Image Manager for Frame Attachments
 *
 * Manages binary image storage in SQLite for Frame visual snapshots.
 * Supports multiple image formats with validation and efficient retrieval.
 */
import Database from "better-sqlite3-multiple-ciphers";
/**
 * Metadata for a stored image
 */
export interface ImageMetadata {
    image_id: string;
    frame_id: string;
    mime_type: string;
    size: number;
    created_at: number;
}
/**
 * Allowed MIME types for image storage
 */
export declare const ALLOWED_MIME_TYPES: readonly ["image/png", "image/jpeg", "image/jpg", "image/svg+xml"];
/**
 * Maximum image size in bytes (10MB)
 */
export declare const MAX_IMAGE_SIZE: number;
/**
 * Image Manager - handles binary image storage for Frames
 */
export declare class ImageManager {
    private db;
    constructor(db: Database.Database);
    /**
     * Store an image attachment for a Frame
     *
     * @param frameId - ID of the Frame to attach the image to
     * @param data - Binary image data as Buffer
     * @param mimeType - MIME type of the image (e.g., "image/png")
     * @returns The generated image_id
     * @throws Error if validation fails
     */
    storeImage(frameId: string, data: Buffer, mimeType: string): string;
    /**
     * Retrieve an image by its ID
     *
     * @param imageId - The image_id to retrieve
     * @returns Object containing image data and MIME type, or null if not found
     */
    getImage(imageId: string): {
        data: Buffer;
        mimeType: string;
    } | null;
    /**
     * List all images attached to a Frame
     *
     * @param frameId - The Frame ID to list images for
     * @returns Array of image metadata (without binary data)
     */
    listFrameImages(frameId: string): ImageMetadata[];
    /**
     * Delete an image by its ID
     *
     * @param imageId - The image_id to delete
     * @returns True if image was deleted, false if not found
     */
    deleteImage(imageId: string): boolean;
    /**
     * Get total count of images in storage
     *
     * @returns Total number of images
     */
    getImageCount(): number;
    /**
     * Get total size of all images in storage (in bytes)
     *
     * @returns Total size in bytes
     */
    getTotalImageSize(): number;
}