"""
Utility functions for chat customization.
"""

def get_default_chat_customisation(tenant_customisation=None):
    """
    Get chat customization options with default values for missing options.
    
    Args:
        tenant_customization (dict, optional): The tenant's customization options.
            Defaults to None.
            
    Returns:
        dict: A dictionary containing all customization options with default values
            for any missing options.
    """
    # Default customization options
    default_customisation = {
        'primary_color': '#007bff',
        'secondary_color': '#6c757d',
        'background_color': '#ffffff',
        'text_color': '#212529',
        'sidebar_color': '#f8f9fa',
        'logo_url': None,
        'sidebar_text': None,
        'welcome_message': 'Hello! How can I help you today?',
        'team_info': []
    }
    
    # If no tenant customization is provided, return the defaults
    if tenant_customisation is None:
        return default_customisation
    
    # Start with the default customization
    customisation = default_customisation.copy()
    
    # Update with tenant customization
    for key, value in tenant_customisation.items():
        if key in customisation:
            customisation[key] = value
    
    return customisation