import type { VzEventEmitter } from '../core/event-emitter.js';
import type { HubItem } from './hub-model.js';
export interface HubControllerOptions {
    items: HubItem[];
    events: VzEventEmitter;
    /** Enter an item: swap the lobby scene for that item's playback. */
    onShowItem: (item: HubItem, index: number) => void;
    /** Return to the lobby scene. */
    onShowLobby: () => void;
}
/**
 * Selection state machine for vz-hub. Tracks whether the viewer is in the lobby
 * (activeIndex -1) or playing an item, drives the show-item/show-lobby callbacks
 * the element wires to the renderer, and fires `vz-hub-select` on entry. Kept
 * separate from the WebGL element so the transitions are unit-tested.
 */
export declare class HubController {
    private items;
    private events;
    private onShowItem;
    private onShowLobby;
    private activeIndex;
    constructor(opts: HubControllerOptions);
    isInLobby(): boolean;
    getActiveIndex(): number;
    /** Select an item by index: play it and fire vz-hub-select. No-op if invalid or already active. */
    select(index: number): void;
    /** Return to the lobby. No-op if already there. */
    back(): void;
}
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