#!/usr/bin/env python3
"""
Auto Model Download for HF Spaces
Automatically downloads video generation models on startup if storage allows
"""

import os
import logging
import asyncio
from pathlib import Path

logger = logging.getLogger(__name__)

async def auto_download_models():
    """Auto-download models on startup if possible"""
    logger.info("?? Auto model download starting...")
    
    try:
        import shutil
        from huggingface_hub import snapshot_download
        
        # Check if models already exist
        models_dir = Path("./downloaded_models")
        if models_dir.exists() and any(models_dir.iterdir()):
            logger.info("? Models already downloaded, skipping...")
            return True
        
        # Check storage
        _, _, free_bytes = shutil.disk_usage(".")
        free_gb = free_bytes / (1024**3)
        
        logger.info(f"?? Storage available: {free_gb:.1f}GB")
        
        if free_gb < 8:  # Need at least 8GB for small models
            logger.warning(f"?? Insufficient storage for model download: {free_gb:.1f}GB < 8GB")
            return False
        
        logger.info("?? Starting automatic model download...")
        
        # Download small video model
        logger.info("?? Downloading text-to-video model...")
        video_path = snapshot_download(
            repo_id="ali-vilab/text-to-video-ms-1.7b",
            cache_dir="./downloaded_models/video"
        )
        
        logger.info("?? Downloading audio model...")
        audio_path = snapshot_download(
            repo_id="facebook/wav2vec2-base-960h",
            cache_dir="./downloaded_models/audio"
        )
        
        # Create success marker
        success_file = models_dir / "download_success.txt"
        with open(success_file, "w") as f:
            f.write(f"Models downloaded successfully\\n")
            f.write(f"Video model: {video_path}\\n")
            f.write(f"Audio model: {audio_path}\\n")
        
        logger.info("? Auto model download completed successfully!")
        return True
        
    except Exception as e:
        logger.error(f"? Auto model download failed: {e}")
        return False

# Set environment variable to indicate auto-download attempt
os.environ["AUTO_MODEL_DOWNLOAD_ATTEMPTED"] = "1"

if __name__ == "__main__":
    # Run auto download
    result = asyncio.run(auto_download_models())
    if result:
        print("?? Models ready for video generation!")
    else:
        print("?? Models not downloaded - running in TTS mode")