#!/usr/bin/env python3
"""
Population Frequency Tool - Mock implementation for testing
"""

from typing import Dict, List, Optional
import click

class PopulationFreqTool:
    """Mock population frequency tool"""
    
    def __init__(self, populations: Optional[List[str]] = None, verbose: bool = False):
        self.populations = populations
        self.verbose = verbose
    
    def calculate_file(self, input_file: str, output_file: str) -> Dict:
        """Mock calculation function"""
        return {'variants_processed': 5}

def main():
    click.echo("Population frequency calculator - Mock implementation")

if __name__ == '__main__':
    main() 