import { EventEmitter } from '../../core/EventEmitter';
import { YouTubeService, YouTubeServiceOptions, YouTubeComment } from './YouTubeService';
/**
 * YouTube Data API implementation using YouTube service
 */
export declare class YouTubeDataApiService extends EventEmitter implements YouTubeService {
    private options;
    private isWatchingLive;
    private watchingIntervalId;
    private nextPageToken;
    private currentLiveId;
    /**
     * Constructor
     * @param options Service settings options
     */
    constructor(options: YouTubeServiceOptions);
    /**
     * Start watching live comments
     * @param liveId Live ID
     */
    startWatching(liveId: string): Promise<void>;
    /**
     * Stop watching live comments
     */
    stopWatching(): void;
    /**
     * Return whether currently fetching
     */
    isWatching(): boolean;
    /**
     * Set comment fetch interval
     * @param interval Interval in milliseconds
     */
    setFetchInterval(interval: number): void;
    /**
     * Set comment selection strategy
     * @param strategy Selection strategy ('random' or 'latest')
     */
    setSelectionStrategy(strategy: 'random' | 'latest'): void;
    /**
     * Fetch latest comments (for manual retrieval)
     * @param liveId Live ID
     * @returns Comments array
     */
    fetchLatestComments(liveId: string): Promise<YouTubeComment[]>;
    /**
     * Subscribe to comment reception event
     * @param callback Callback when comment is received
     */
    onComment(callback: (comment: YouTubeComment) => void): void;
    /**
     * Get live chat ID
     * @param liveId Live ID
     * @returns Live chat ID
     */
    private getLiveChatId;
    /**
     * Fetch live comments
     * @param liveChatId Live chat ID
     * @param usePageToken Whether to use page token
     * @returns Comments array
     */
    private retrieveLiveComments;
    /**
     * Fetch and process comments
     * @param liveChatId Live chat ID
     */
    private fetchAndProcessComments;
}