# EU-Utility Quality Standards

This document defines the quality standards for EU-Utility to maintain peak code quality.

## Code Organization

```
EU-Utility/
├── core/                    # Core functionality
│   ├── __init__.py
│   ├── main.py             # Application entry point
│   ├── api/                # API layer
│   │   ├── __init__.py
│   │   ├── nexus_api.py
│   │   └── external_api.py
│   ├── services/           # Business logic
│   │   ├── __init__.py
│   │   ├── ocr_service.py
│   │   ├── screenshot.py
│   │   └── data_store.py
│   ├── ui/                 # UI components
│   │   ├── __init__.py
│   │   ├── overlay.py
│   │   ├── dashboard.py
│   │   └── widgets/
│   └── utils/              # Utilities
│       ├── __init__.py
│       ├── security.py
│       └── helpers.py
├── plugins/                # Plugin system
│   ├── __init__.py
│   ├── base_plugin.py
│   ├── plugin_manager.py
│   └── builtin/            # Built-in plugins
├── tests/                  # Test suite
│   ├── __init__.py
│   ├── test_core/
│   ├── test_plugins/
│   └── test_integration/
├── docs/                   # Documentation
├── assets/                 # Static assets
├── config/                 # Configuration files
├── scripts/                # Utility scripts
├── setup.py               # Package setup
├── pyproject.toml         # Modern Python config
├── requirements.txt       # Dependencies
├── requirements-dev.txt   # Dev dependencies
├── Makefile              # Build automation
├── LICENSE               # MIT License
├── CHANGELOG.md          # Version history
├── CONTRIBUTING.md       # Contribution guide
└── README.md             # Project readme
```

## Naming Conventions

- **Files**: `snake_case.py`
- **Classes**: `PascalCase`
- **Functions/Methods**: `snake_case()`
- **Constants**: `UPPER_SNAKE_CASE`
- **Private**: `_leading_underscore`
- **Protected**: `_single_leading_underscore`

## Code Style

- Follow PEP 8
- Maximum line length: 100 characters
- Use type hints for all function signatures
- Docstrings for all public APIs (Google style)
- Comments for complex logic

## Documentation Standards

### README.md
- Clear project description
- Installation instructions
- Quick start guide
- Feature list
- Screenshots/GIFs
- Contributing link
- License

### Function Docstrings
```python
def example_function(param1: str, param2: int) -> bool:
    """Short description.
    
    Longer description if needed. Can span multiple
    lines and provide detailed context.
    
    Args:
        param1: Description of param1.
        param2: Description of param2.
        
    Returns:
        Description of return value.
        
    Raises:
        ValueError: When param2 is negative.
        
    Example:
        >>> example_function("test", 42)
        True
    """
    pass
```

## Testing Standards

- Unit tests for all functions
- Integration tests for workflows
- Minimum 80% code coverage
- Tests must pass before merging

## Security Standards

- No hardcoded credentials
- Input validation on all user inputs
- Use parameterized queries
- Secure defaults
- Regular dependency updates

## Performance Standards

- Profile before optimizing
- Use async for I/O operations
- Cache expensive operations
- Lazy loading for heavy resources
- Memory cleanup on exit

## Git Standards

- Commit messages: `type(scope): description`
- Types: feat, fix, docs, style, refactor, test, chore
- One logical change per commit
- Reference issues in commits
- Squash before merging to main

## Release Process

1. Update version in `__init__.py`
2. Update CHANGELOG.md
3. Run full test suite
4. Create git tag: `git tag vX.Y.Z`
5. Push to origin: `git push origin vX.Y.Z`
6. Create GitHub release

## Code Review Checklist

- [ ] Code follows style guide
- [ ] Tests added/updated
- [ ] Documentation updated
- [ ] No security vulnerabilities
- [ ] Performance acceptable
- [ ] Backwards compatible (or properly versioned)