# Deployment Guide for Hugging Face Spaces

## Step-by-Step Deployment

### 1. Create a Hugging Face Account
- Go to https://huggingface.co
- Sign up or log in

### 2. Create a New Space
1. Click on your profile → "New Space"
2. Fill in the details:
   - **Space name**: `virtual-tryon-api` (or your preferred name)
   - **License**: Apache 2.0
   - **SDK**: Select **Docker**
   - **Hardware**: CPU (free) or upgrade to GPU for faster processing
3. Click "Create Space"

### 3. Upload Files to Your Space

You can upload files via:

#### Option A: Web Interface
1. In your Space, click "Files" → "Add file" → "Upload files"
2. Upload these files:
   - `app.py`
   - `requirements.txt`
   - `Dockerfile`
   - `README.md`
3. Commit the changes

#### Option B: Git (Recommended)
```bash
# Clone your Space repository
git clone https://huggingface.co/spaces/YOUR-USERNAME/virtual-tryon-api
cd virtual-tryon-api

# Copy files
cp /path/to/app.py .
cp /path/to/requirements.txt .
cp /path/to/Dockerfile .
cp /path/to/README.md .

# Commit and push
git add .
git commit -m "Initial commit: Virtual Try-On API"
git push
```

### 4. Wait for Build
- Your Space will automatically start building
- This may take 10-20 minutes for the first build
- You can view build logs in the "Logs" tab

### 5. Test Your Deployment
Once built, your API will be available at:
```
https://YOUR-USERNAME-virtual-tryon-api.hf.space
```

Test the health endpoint:
```bash
curl https://YOUR-USERNAME-virtual-tryon-api.hf.space/health
```

### 6. Update Your React Native App
In your React Native app, update the API URL:
```javascript
const API_URL = 'https://YOUR-USERNAME-virtual-tryon-api.hf.space';
```

## File Structure
```
your-space/
├── app.py              # Main FastAPI application
├── requirements.txt    # Python dependencies
├── Dockerfile         # Docker configuration
└── README.md          # Space documentation
```

## Important Notes

### CPU vs GPU
- **CPU (Free)**: 
  - Free tier available
  - Slower processing (30-60 seconds per image)
  - Suitable for testing and low-volume use
  
- **GPU (Paid)**:
  - Faster processing (5-15 seconds per image)
  - Costs apply (check HF pricing)
  - Recommended for production

To enable GPU, modify your Space settings:
1. Go to Space Settings
2. Select GPU hardware
3. Rebuild

### Memory Considerations
The models are large (~10GB). Ensure your Space has enough memory:
- Minimum: 16GB RAM
- Recommended: 32GB RAM (especially for CPU)

### Model Download Time
On first run, models will download from Hugging Face:
- Stable Diffusion XL: ~7GB
- IP-Adapter: ~3GB
- Body Segmentation: ~100MB

This happens automatically but adds to initial startup time.

### Rate Limiting
For production use, consider adding rate limiting:

```python
from slowapi import Limiter
from slowapi.util import get_remote_address

limiter = Limiter(key_func=get_remote_address)
app.state.limiter = limiter

@app.post("/tryon")
@limiter.limit("5/minute")  # 5 requests per minute
async def virtual_tryon(...):
    # ... existing code
```

### Authentication
For secure API access, add authentication:

```python
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from fastapi import Security

security = HTTPBearer()

def verify_token(credentials: HTTPAuthorizationCredentials = Security(security)):
    if credentials.credentials != "your-secret-token":
        raise HTTPException(status_code=401, detail="Invalid token")

@app.post("/tryon")
async def virtual_tryon(
    token: HTTPAuthorizationCredentials = Security(verify_token),
    ...
):
    # ... existing code
```

## Troubleshooting

### Build Fails
- Check build logs in the "Logs" tab
- Ensure all dependencies in requirements.txt are compatible
- Verify Dockerfile syntax

### Out of Memory
- Reduce model precision (use float16 instead of float32)
- Reduce batch size
- Upgrade to larger hardware tier

### Slow Performance
- Consider upgrading to GPU hardware
- Reduce `num_steps` parameter (trade quality for speed)
- Implement caching for repeated requests

### API Not Responding
- Check if Space is running (green status)
- Verify the URL is correct
- Check CORS settings if accessing from web

## Monitoring

Monitor your Space:
1. **Usage**: Check Space settings for API call statistics
2. **Logs**: View application logs in real-time
3. **Performance**: Monitor response times

## Updating Your Space

To update your deployed API:
```bash
# Make changes to your files
git add .
git commit -m "Update: description of changes"
git push
```

The Space will automatically rebuild with your changes.

## Support

- Hugging Face Docs: https://huggingface.co/docs/hub/spaces
- Community Forum: https://discuss.huggingface.co
- Discord: https://discord.gg/hugging-face

## Next Steps

1. Test your API thoroughly
2. Implement authentication for production
3. Add rate limiting
4. Monitor usage and optimize
5. Consider upgrading to GPU for better performance