import { AbstractTTSClient } from "../core/abstract-tts";
import type { SpeakOptions, TTSCredentials, UnifiedVoice } from "../types";
import { type WordBoundary } from "../utils/word-timing-estimator";
/**
 * OpenAI TTS Client Credentials
 */
/**
 * Extended options for OpenAI TTS
 */
export interface OpenAITTSOptions extends SpeakOptions {
    /** OpenAI Model */
    model?: string;
    /** OpenAI Voice */
    voice?: string;
    /** OpenAI Speed (maps to rate) */
    speed?: number;
    /** Output format */
    format?: "mp3" | "opus" | "aac" | "flac" | "wav" | "pcm";
    /**
     * Output directory for audio files
     */
    outputDir?: string;
    /**
     * Output file name
     */
    outputFile?: string;
    /**
     * Callback for word boundary events
     */
    onWord?: (wordBoundary: WordBoundary) => void;
    /**
     * Whether to return word boundaries
     */
    returnWordBoundaries?: boolean;
    /**
     * Callback for end of speech event
     */
    onEnd?: () => void;
}
/**
 * OpenAI TTS Client Credentials
 */
export interface OpenAITTSCredentials extends TTSCredentials {
    /** OpenAI API Key */
    apiKey?: string;
    /** Base URL for OpenAI API */
    baseURL?: string;
    /** Organization ID */
    organization?: string;
}
/**
 * OpenAI TTS Client
 *
 * This client uses the OpenAI API to convert text to speech.
 * It supports streaming audio but does not support SSML.
 * Word boundaries are estimated since OpenAI doesn't provide word events.
 */
export declare class OpenAITTSClient extends AbstractTTSClient {
    private client;
    private clientLoadingPromise;
    protected credentials: OpenAITTSCredentials;
    private model;
    private voice;
    private instructions;
    private responseFormat;
    private lastWordBoundaries;
    /**
     * Get the last word boundaries
     * @returns Array of word boundary objects
     */
    getLastWordBoundaries(): WordBoundary[];
    /**
     * Set the last word boundaries
     * @param wordBoundaries Array of word boundary objects
     */
    setLastWordBoundaries(wordBoundaries: WordBoundary[]): void;
    /**
     * Create a new OpenAI TTS Client
     * @param credentials OpenAI API credentials
     */
    constructor(credentials?: OpenAITTSCredentials);
    /**
     * Load the OpenAI SDK dynamically.
     * Returns the initialized client (real or mock).
     */
    private loadClient;
    /**
     * Check if the credentials are valid
     * @returns Promise resolving to true if credentials are valid, false otherwise
     */
    checkCredentials(): Promise<boolean>;
    /**
     * Get the list of required credential types for this engine
     * @returns Array of required credential field names
     */
    protected getRequiredCredentials(): string[];
    /**
     * Get available voices
     * @returns Promise resolving to an array of unified voice objects
     */
    protected _getVoices(): Promise<UnifiedVoice[]>;
    /**
     * Map OpenAI voice objects to unified format
     * @param rawVoices Array of OpenAI voice objects
     * @returns Promise resolving to an array of unified voice objects
     */
    protected _mapVoicesToUnified(rawVoices: any[]): Promise<UnifiedVoice[]>;
    /**
     * Set the voice to use for synthesis
     * @param voiceId Voice ID to use
     */
    setVoice(voiceId: string): void;
    /**
     * Set the model to use for synthesis
     * @param model Model ID to use
     */
    setModel(model: string): void;
    /**
     * Set instructions for the TTS engine
     * @param instructions Instructions for the TTS engine
     */
    setInstructions(instructions: string): void;
    /**
     * Set the response format
     * @param format Response format (mp3, opus, aac, flac, wav, pcm)
     */
    setResponseFormat(format: string): void;
    /**
     * Get a property value
     * @param property Property name
     * @returns Property value
     */
    getProperty(property: string): any;
    /**
     * Set a property value
     * @param property Property name
     * @param value Property value
     */
    setProperty(property: string, value: any): void;
    /**
     * Convert text to speech
     * @param text Text to convert to speech
     * @param options TTS options
     * @returns Promise resolving to the path of the generated audio file
     */
    textToSpeech(text: string, options?: OpenAITTSOptions): Promise<string>;
    /**
     * Convert text to speech with streaming
     * @param text Text to convert to speech
     * @param options TTS options
     * @returns Promise resolving to the path of the generated audio file
     */
    textToSpeechStreaming(text: string, options?: OpenAITTSOptions): Promise<string>;
    /**
     * Convert SSML to speech (not supported by OpenAI)
     * @param ssml SSML to convert to speech
     * @param options TTS options
     * @returns Promise resolving to the path of the generated audio file
     */
    ssmlToSpeech(_ssml: string, _options?: OpenAITTSOptions): Promise<string>;
    /**
     * Convert SSML to speech with streaming (not supported by OpenAI)
     * @param ssml SSML to convert to speech
     * @param options TTS options
     * @returns Promise resolving to the path of the generated audio file
     */
    ssmlToSpeechStreaming(_ssml: string, _options?: OpenAITTSOptions): Promise<string>;
    /**
     * Synthesize text to audio bytes
     * @param text Text to synthesize
     * @param options Synthesis options
     * @returns Promise resolving to audio bytes
     */
    synthToBytes(text: string | string[], options?: OpenAITTSOptions): Promise<Uint8Array>;
    /**
     * Synthesize text to a byte stream using OpenAI API.
     * @param text Text to synthesize.
     * @param _options Synthesis options (currently unused for streaming, uses defaults).
     * @returns Promise resolving to an object containing the audio stream and an empty word boundaries array.
     */
    synthToBytestream(text: string, _options?: SpeakOptions): Promise<{
        audioStream: ReadableStream<Uint8Array>;
        wordBoundaries: Array<{
            text: string;
            offset: number;
            duration: number;
        }>;
    }>;
}