import { ChatScreenplay } from '../types/chat';
import { AudioPlayOptions, VoiceService, VoiceServiceOptions, VoiceServiceOptionsUpdate } from './VoiceService';
/**
 * Adapter implementation for using existing voice engines
 */
export declare class VoiceEngineAdapter implements VoiceService {
    private options;
    private audioPlayer;
    private requestQueue;
    private isProcessingQueue;
    private activeRequest?;
    private requestIdCounter;
    private cachedPiperPlusEngine?;
    /**
     * Constructor
     * @param options Voice service options
     */
    constructor(options: VoiceServiceOptions);
    private bindOnCompleteCallback;
    /**
     * Speak the screenplay as audio
     * @param screenplay Screenplay (text and emotion)
     * @param options Audio playback options
     */
    speak(screenplay: ChatScreenplay, options?: AudioPlayOptions): Promise<void>;
    private createSpeechRequest;
    private processQueue;
    private mapEmotionToStyle;
    private fetchAudioForScreenplay;
    private getEngine;
    private playAudioBuffer;
    /**
     * Speak text as audio
     * @param text Text (with emotion tags) to speak
     * @param options Audio playback options
     */
    speakText(text: string, options?: AudioPlayOptions): Promise<void>;
    /**
     * Get whether currently playing
     */
    isPlaying(): boolean;
    /**
     * Get current service settings
     */
    getOptions(): VoiceServiceOptions;
    /**
     * Stop playback
     */
    stop(): void;
    /**
     * Update service settings
     * @param options New settings options
     */
    updateOptions(options: VoiceServiceOptionsUpdate | Partial<VoiceServiceOptions>): void;
    /**
     * Switch voice engine with complete options for the target engine
     * @param options New engine options
     */
    switchEngine(options: VoiceServiceOptions): void;
    private validateUpdateOptions;
    private mergeOptionsForCurrentEngine;
}