/**
 * Viewer Initialization Helper
 *
 * Extracts initialization logic from Viewer.svelte to improve testability
 * and reduce complexity in the component. This follows CODE_REVIEW.md
 * recommendation 1.3: "Extract Viewer Initialization Logic"
 */
import type { ManifestEntry } from '../../core/state/manifests';
import type { MediaSource } from '../../iiif/mediaResolver';
import { type ImageFilters } from '../../core/types/filters';
import type { ViewBox } from '../../core/types/viewer';
import type { ViewerConfig } from '../../core/types/config';
import type { URLStateParams } from '../osd/URLStateManager';
/**
 * Configuration for viewer initialization
 */
export type ViewerInitConfig = {
    manifestId: string;
    initialCanvasIndex?: number;
    initialMediaIndex?: number;
};
export type InitialViewerState = {
    selectedCanvasIndex: number;
    layoutMode: 'single' | 'two-page' | 'continuous' | 'gallery';
    rotation: number;
    viewBox: ViewBox | null;
};
/** Resolve startup defaults, with URL hash values taking precedence over config. */
export declare const resolveInitialViewerState: (config?: ViewerConfig, urlState?: URLStateParams) => InitialViewerState;
/**
 * State that needs to be reset when manifest changes
 */
export type ManifestChangeState = {
    selectedCanvasIndex: number;
    selectedMediaIndex: number;
    viewBox: ViewBox | null;
    zoom: number;
    searchQuery: string;
    imageFilters: ImageFilters;
};
/**
 * Result of media resolution
 */
export type MediaResolution = {
    mediaSources: MediaSource[];
    mediaSource: MediaSource | null;
    mediaType: string | null;
};
/**
 * Create initial state when manifest changes
 * Returns state that should be reset
 */
export declare const createManifestChangeState: () => ManifestChangeState;
/**
 * Resolve media sources for a canvas
 * Extracts the logic for determining which media sources are available
 */
export declare const resolveMediaForCanvas: (manifestEntry: ManifestEntry | undefined, canvasId: string | undefined, canvasIndex: number, selectedMediaIndex: number) => MediaResolution;
/**
 * Validate and clamp canvas index to valid range
 */
export declare const validateCanvasIndex: (canvasIndex: number, totalCanvases: number) => number;
/**
 * Check if manifest has changed
 */
export declare const hasManifestChanged: (currentManifestId: string, previousManifestId: string) => boolean;