# is_hostname_unknown Function Implementation Summary

## Overview

A new utility function `is_hostname_unknown` has been added to the TasmotaManager.py script to provide a centralized way to check if a hostname matches any pattern in the `unknown_device_patterns` list. This function standardizes the pattern matching logic that was previously duplicated in multiple places throughout the codebase.

## Implementation Details

The function has been implemented as a method of the `TasmotaDiscovery` class:

```python
def is_hostname_unknown(self, hostname: str, patterns: list = None) -> bool:
    """Check if a hostname matches any pattern in unknown_device_patterns.
    
    This function provides a centralized way to check if a hostname matches any of the
    unknown_device_patterns defined in the configuration. It uses case-insensitive
    matching and supports glob patterns (with *) in the patterns list.
    
    Args:
        hostname: The hostname to check against unknown_device_patterns
        patterns: Optional list of patterns to check against. If not provided,
                  patterns will be loaded from the configuration.
                  
    Returns:
        bool: True if the hostname matches any pattern, False otherwise
        
    Examples:
        # Check if a hostname matches any unknown_device_patterns in the config
        if manager.is_hostname_unknown("tasmota_device123"):
            print("This is an unknown device")
            
        # Check against a specific list of patterns
        custom_patterns = ["esp-*", "tasmota_*"]
        if manager.is_hostname_unknown("esp-abcd", custom_patterns):
            print("This matches a custom pattern")
    """
    # If no patterns provided, get them from the configuration
    if patterns is None:
        patterns = []
        network_filters = self.config['unifi'].get('network_filter', {})
        for network in network_filters.values():
            patterns.extend(network.get('unknown_device_patterns', []))
    
    # Convert hostname to lowercase for case-insensitive matching
    hostname_lower = hostname.lower()
    
    # Check if hostname matches any pattern
    for pattern in patterns:
        pattern_lower = pattern.lower()
        # Convert glob pattern to regex pattern
        pattern_regex = pattern_lower.replace('.', r'\.').replace('*', '.*')
        if re.match(f"^{pattern_regex}", hostname_lower):
            self.logger.debug(f"Hostname '{hostname}' matches unknown device pattern: {pattern}")
            return True
    
    return False
```

## Features

The function includes the following features:

1. **Centralized Logic**: Provides a single place for hostname pattern matching logic
2. **Case Insensitivity**: Performs case-insensitive matching
3. **Glob Pattern Support**: Supports glob patterns (with *) in the patterns list
4. **Flexible Pattern Source**: Can use patterns from the configuration or a custom list
5. **Detailed Logging**: Logs when a hostname matches a pattern
6. **Comprehensive Documentation**: Includes detailed docstring with examples

## Testing

A comprehensive test script (`test_is_hostname_unknown.py`) has been created to verify the function's behavior. The tests include:

1. Testing with patterns from the configuration
2. Testing with custom patterns
3. Testing case insensitivity

All tests have passed, confirming that the function works correctly in all scenarios.

## Usage Examples

### Basic Usage

```python
# Check if a hostname matches any unknown_device_patterns in the config
if manager.is_hostname_unknown("tasmota_device123"):
    print("This is an unknown device")
```

### With Custom Patterns

```python
# Check against a specific list of patterns
custom_patterns = ["esp-*", "tasmota_*"]
if manager.is_hostname_unknown("esp-abcd", custom_patterns):
    print("This matches a custom pattern")
```

## Potential Refactoring Opportunities

The following places in the code could potentially be refactored to use the new function:

1. In `get_tasmota_devices` (lines 235-244)
2. In `get_unknown_devices` (lines 500-506)
3. In `process_single_device` (lines 1526-1533)
4. In `process_devices` (lines 1760-1766)

Refactoring these sections would improve code maintainability and ensure consistent behavior across all parts of the application.

## Conclusion

The `is_hostname_unknown` function provides a centralized, well-documented, and thoroughly tested way to check if a hostname matches any pattern in the `unknown_device_patterns` list. This implementation satisfies the requirements specified in the issue description and improves the overall code quality of the TasmotaManager.py script.