"""
Voice output — converts text to speech using Fish Audio TTS API.
"""
import os
import asyncio
from fish_audio_sdk import Session, TTSRequest

async def speak(text: str) -> bytes:
    """
    Convert text to speech audio bytes using Fish Audio TTS.
    Returns raw audio bytes (MP3).
    """
    api_key = os.getenv("FISH_AUDIO_API_KEY")
    voice_id = os.getenv("FISH_AUDIO_VOICE_ID", None)
    loop = asyncio.get_event_loop()

    def _tts():
        with Session(apikey=api_key) as session:
            audio_chunks = []
            for chunk in session.tts(TTSRequest(
                text=text,
                reference_id=voice_id
            )):
                audio_chunks.append(chunk)
            return b"".join(audio_chunks)

    return await loop.run_in_executor(None, _tts)