import os
import requests
import uuid

DEEPGRAM_API_KEY = os.environ.get("DEEPGRAM_API_KEY", "ad59620bea7b23c52d31d273902839e950491bf2")
DEEPGRAM_TTS_URL = "https://api.deepgram.com/v1/speak"

AVAILABLE_VOICES = {
    "Thalia (En-US - Conversational / Medical)": "aura-2-thalia-en",
    "Luna (En-US - Warm & Empathetic)": "aura-2-luna-en",
    "Stella (En-US - Professional & Crisp)": "aura-2-stella-en",
    "Zeus (En-US - Authoritative Male)": "aura-2-zeus-en",
    "Orion (En-US - Friendly Male)": "aura-2-orion-en"
}

def generate_voice_audio(text: str, voice_model: str = "aura-2-thalia-en") -> str:
    """
    Calls Deepgram Aura-2 Text-to-Speech API to synthesize natural audio.
    Returns filepath to generated .mp3 file.
    """
    if not text or not text.strip():
        return None

    headers = {
        "Authorization": f"Token {DEEPGRAM_API_KEY}",
        "Content-Type": "text/plain"
    }
    
    url = f"{DEEPGRAM_TTS_URL}?model={voice_model}"
    
    try:
        response = requests.post(url, headers=headers, data=text.encode("utf-8"), timeout=15)
        
        if response.status_code == 200 and len(response.content) > 0:
            os.makedirs("audio_output", exist_ok=True)
            filename = f"audio_output/call_resp_{uuid.uuid4().hex[:8]}.mp3"
            with open(filename, "wb") as f:
                f.write(response.content)
            return filename
        else:
            print(f"[DeepgramTTS] API returned status {response.status_code}: {response.text}")
            return None
            
    except Exception as e:
        print(f"[DeepgramTTS] Exception calling Deepgram API: {e}")
        return None