genesis/narration.py

# genesis/narration.py
"""
Narration Module for GENESIS-AI
Generates audio narration from text using ElevenLabs, with gTTS fallback.
"""

import os
import requests
from gtts import gTTS

ELEVEN_LABS_API_KEY = os.getenv("ELEVEN_LABS_API_KEY")
ELEVEN_TTS_URL = "https://api.elevenlabs.io/v1/text-to-speech"

def narrate_text_elevenlabs(text, voice="Rachel"):
    """Generate narration using ElevenLabs API."""
    headers = {
        "xi-api-key": ELEVEN_LABS_API_KEY,
        "Content-Type": "application/json"
    }
    payload = {"text": text, "voice_settings": {"stability": 0.75, "similarity_boost": 0.75}}
    try:
        r = requests.post(f"{ELEVEN_TTS_URL}/{voice}", json=payload, headers=headers)
        r.raise_for_status()
        output_path = "narration.mp3"
        with open(output_path, "wb") as f:
            f.write(r.content)
        return output_path
    except Exception as e:
        return {"error": str(e)}

def narrate_text_gtts(text, lang="en"):
    """Fallback narration with gTTS."""
    try:
        tts = gTTS(text=text, lang=lang)
        output_path = "narration_fallback.mp3"
        tts.save(output_path)
        return output_path
    except Exception as e:
        return {"error": str(e)}

def narrate_text(text):
    """Try ElevenLabs first, else fallback."""
    if ELEVEN_LABS_API_KEY:
        result = narrate_text_elevenlabs(text)
        if isinstance(result, str):
            return result
    return narrate_text_gtts(text)