/**
 * YouTube comment type definition
 */
export interface YouTubeComment {
    /** User name */
    userName: string;
    /** User icon URL */
    userIconUrl: string;
    /** Comment content */
    userComment: string;
    /** Published time */
    publishedAt?: string;
}
/**
 * YouTube service settings options
 */
export interface YouTubeServiceOptions {
    /** YouTube Data API key */
    apiKey: string;
    /** Comment fetch interval (milliseconds) */
    fetchInterval?: number;
    /** Comment selection strategy ('random' or 'latest') */
    selectionStrategy?: 'random' | 'latest';
}
/**
 * YouTube service interface
 */
export interface YouTubeService {
    /**
     * 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;
}