app/config.py

"""
Configuration - Environment Variables Only
"""
import os
from typing import Optional


class Config:
    """Engine configuration from environment variables"""
    
    # Hugging Face API
    HF_TOKEN: str = os.getenv("HF_TOKEN", "")
    
    # Model Configuration
    HF_TEXT_MODEL: str = os.getenv("HF_TEXT_MODEL", "meta-llama/Meta-Llama-3-8B-Instruct")
    HF_ASR_MODEL: str = os.getenv("HF_ASR_MODEL", "openai/whisper-base")
    HF_TTS_MODEL: str = os.getenv("HF_TTS_MODEL", "facebook/fastspeech2-en-ljspeech")
    HF_AVATAR_MODEL: str = os.getenv("HF_AVATAR_MODEL", "vinthony/SadTalker")
    
    # API Configuration
    ENGINE_NAME: str = "avatar-tutor-engine"
    ENGINE_VERSION: str = "1.0.0"
    
    # Server
    HOST: str = os.getenv("HOST", "0.0.0.0")
    PORT: int = int(os.getenv("PORT", "7860"))
    
    @classmethod
    def validate(cls) -> Optional[str]:
        """Validate required configuration"""
        if not cls.HF_TOKEN:
            return "HF_TOKEN environment variable is required"
        return None


config = Config()