"""Base model class with automatic registry registration."""

from backend.core.database_registry import registry


class BaseModel:
    """
    Base model mixin that automatically registers models with the registry.
    
    All models should inherit from both this class and Base.
    """
    
    def __init_subclass__(cls, **kwargs):
        """Automatically register model when subclass is created."""
        super().__init_subclass__(**kwargs)
        
        # Only register if the class has a __tablename__
        if hasattr(cls, '__tablename__'):
            # Register with the registry to prevent duplicate definitions
            registered_model = registry.register_model(cls)
            
            # If a different model was already registered for this table,
            # update the class to use the registered one
            if registered_model is not cls:
                # Copy attributes from registered model
                for key, value in registered_model.__dict__.items():
                    if not key.startswith('_'):
                        setattr(cls, key, value)


def create_model_base():
    """
    Create a base class for all models that combines SQLAlchemy Base and registry.
    
    Returns:
        A base class that all models should inherit from
    """
    # Create a new base class that combines BaseModel with the registry's Base
    class Model(BaseModel, registry.Base):
        """Base class for all database models."""
        __abstract__ = True
        
    return Model


# Create the model base class
Model = create_model_base()