# Quick Reference - Import Statements

## New Import Pattern

```python
# Detection modules
from src.detectors import (
    YOLODetector,
    ViolenceDetector,
    WeaponPersonDetector,
    PoseDetection,
    AnomalyDetector,
)

# Or import from src directly
from src import YOLODetector, ViolenceDetector

# Pipeline
from src.pipeline import VideoCapture

# Configuration
from config import (
    MODEL_PATHS,
    get_model_path,
    DETECTION_THRESHOLDS,
    PROCESSING_PARAMS,
    SECRET_KEY,
    DATABASE_URI,
    MAX_CONTENT_LENGTH,
    UPLOAD_FOLDER,
    PROCESSED_FOLDER,
)
```

## Common Usage Examples

### Load a Model

```python
# Old way
model_path = Path(__file__).parent.parent / "ai_models" / "object_detection" / "yolov8n.pt"

# New way
from config import get_model_path
model_path = get_model_path('yolo')
```

### Get Detection Threshold

```python
# Old way
conf_threshold = 0.25  # Magic number

# New way
from config import DETECTION_THRESHOLDS
conf_threshold = DETECTION_THRESHOLDS['yolo']
```

### Create Detector

```python
from src.detectors import YOLODetector
from config import get_model_path

model_path = get_model_path('yolo')
detector = YOLODetector(model_path=str(model_path))
```

### Access Settings

```python
from config import SECRET_KEY, MAX_CONTENT_LENGTH, UPLOAD_FOLDER

print(f"Upload location: {UPLOAD_FOLDER}")
print(f"Max size: {MAX_CONTENT_LENGTH / (1024*1024)} MB")
```

### Check Available Models

```python
from config import get_all_available_models

models = get_all_available_models()
# Output: {'yolo': True, 'violence': False, 'weapon': True, ...}

for model_name, is_available in models.items():
    status = "✓" if is_available else "✗"
    print(f"{status} {model_name}")
```

## File Organization Reference

```
src/                          Source code
├── detectors/               AI detection modules
│   ├── yolo_detector.py
│   ├── violence_detector.py
│   ├── weapon_detector.py
│   ├── pose_detector.py
│   └── anomaly_detector.py
├── pipeline/                Video processing
│   └── video_capture.py
└── utils/                   Utilities

config/                       Configuration
├── settings.py              App settings
└── model_config.py          Model management

models/                       Model weights (organized by type)
├── object_detection/
├── weapon_detection/
├── pose_detection/
└── anomaly_detection/

webapp/                        Flask web app
├── app.py
├── templates/
└── static/

docs/                         Documentation
├── PROJECT_STRUCTURE.md
└── MIGRATION_GUIDE.md
```

## Environment Setup

```bash
# Install dependencies
pip install -r requirements.txt

# Run web app
cd webapp
python app.py

# Or from root
python -c "from src import YOLODetector; print('✓ Imports working')"
```

## Troubleshooting

**"ModuleNotFoundError: No module named 'src'"**
- Ensure you're running from project root directory
- Check that src/__init__.py exists

**"ModuleNotFoundError: No module named 'config'"**
- Check that config/__init__.py exists
- Run from project root

**"Model not found"**
```python
from config import get_all_available_models
print(get_all_available_models())  # Check which models are available
```

**Import errors after migration**
- Make sure webapp/app.py imports were updated
- Verify sys.path includes project root
- Check Python version (3.9+ recommended)