"""Validation utilities for the Work Statistics System."""


def is_valid_name(name):
    """Check if a name is valid (non-empty and not whitespace only).
    
    Args:
        name: The name string to validate
        
    Returns:
        True if valid, False otherwise
    """
    if name is None:
        return False
    return bool(name.strip())


def is_positive_number(value):
    """Check if a value is a positive number.
    
    Args:
        value: The value to check
        
    Returns:
        True if positive number, False otherwise
    """
    try:
        return float(value) > 0
    except (TypeError, ValueError):
        return False


def is_positive_integer(value):
    """Check if a value is a positive integer.
    
    Args:
        value: The value to check
        
    Returns:
        True if positive integer, False otherwise
    """
    try:
        return isinstance(value, int) and value > 0
    except (TypeError, ValueError):
        return False