genesis/narration.py

# genesis/narration.py
import os
import requests
from typing import Optional

ELEVEN_LABS_API_KEY = os.getenv("ELEVEN_LABS_API_KEY")
VOICE_ID = "EXAVITQu4vr4xnSDxMaL"  # Default voice; change in ElevenLabs dashboard if needed

def narrate_text(text: str) -> Optional[str]:
    """Convert text to speech using ElevenLabs API and return audio URL."""
    if not ELEVEN_LABS_API_KEY:
        print("[Narration] No ElevenLabs API key provided.")
        return None

    try:
        url = f"https://api.elevenlabs.io/v1/text-to-speech/{VOICE_ID}"
        headers = {
            "xi-api-key": ELEVEN_LABS_API_KEY,
            "Content-Type": "application/json"
        }
        payload = {
            "text": text,
            "voice_settings": {
                "stability": 0.4,
                "similarity_boost": 0.8
            }
        }
        r = requests.post(url, headers=headers, json=payload, timeout=30)
        r.raise_for_status()

        # Save audio locally
        audio_file = "narration.mp3"
        with open(audio_file, "wb") as f:
            f.write(r.content)

        # In Spaces, you can serve local files directly
        return audio_file
    except Exception as e:
        print(f"[Narration] Failed: {e}")
        return None