"""Create reasoning_engine
Generated by Phi-Octopus Eden
2025-11-06 13:01:40.657142
"""

```python
class ReasoningEngine:
    """
    A simple reasoning engine that can evaluate basic logical expressions based on provided facts.

    Args:
        facts (dict): A dictionary where keys are variable names and values are boolean truth values.
                      Example: {"A": True, "B": False}

    Methods:
        update_facts(facts: dict) -> None:
            Update the current set of facts.

        evaluate(expression: str) -> bool | None:
            Evaluate a logical expression based on the current facts. Returns True or False if the
            expression is solvable with the given facts, otherwise returns None.
    """

    def __init__(self):
        self.facts = {}

    def update_facts(self, facts: dict) -> None:
        """
        Update the current set of facts.

        Args:
            facts (dict): A dictionary where keys are variable names and values are boolean truth values.
        """
        self.facts.update(facts)

    def evaluate(self, expression: str) -> bool | None:
        """
        Evaluate a logical expression based on the current facts. The supported operations are AND, OR, NOT.

        Args:
            expression (str): A string representing a logical expression to be evaluated.
                              Example: "A and not B or C"

        Returns:
            bool | None: True if the expression evaluates to true with the given facts, False if it's false,
                         otherwise returns None indicating insufficiency of information.
        """
        # Simple parser that splits the expression into parts
        tokens = [token for token in expression.replace(' ', '')]
        
        def parse_token(token):
            return self.facts.get(token) if token.isalpha() else token

        stack = []
        operator_stack = []

        for token in tokens:
            if token in ['(', ')']:
                continue  # Handle parentheses
            elif token == 'and':
                operator_stack.append('and')
            elif token == 'or':
                while (operator := operator_stack[-1]) != '(' and operator != 'not':
                    value_2 = stack.pop()
                    value_1 = stack.pop()
                    result = self._logical_operation(value_1, value_2, operator)
                    if result is None:
                        return None
                    stack.append(result)
                operator_stack.append(token)  # Push the new operator on top of the stack
            elif token == 'not':
                next_value = parse_token(tokens.pop(0))
                if not isinstance(next_value, bool):
                    return None
                value_1 = stack.pop()
                result = self._logical_operation(value_1, next_value, 'not')
                stack.append(result)
            else:
                stack.append(parse_token(token))

        while operator_stack:
            value_2 = stack.pop()
            value_1 = stack.pop()
            if (result := self._logical_operation(value_1, value_2, operator_stack.pop())) is None:
                return None
            stack.append(result)

        return bool(stack[0])

    def _logical_operation(self, value_1: bool | str, value_2: bool | str, op: str) -> bool | None:
        """
        Perform a logical operation based on the operator.

        Args:
            value_1 (bool | str): First operand.
            value_2 (bool | str): Second operand.
            op (str): Operator ('and', 'or', or 'not').

        Returns:
            bool | None: Result of the logical operation, or None if an error occurred.
        """
        try:
            return {
                'and': value_1 and value_2,
                'or': value_1 or value_2
            }.get(op)
        except Exception as e:
            print(f"Error evaluating expression: {e}")
            return None

# Example usage
if __name__ == "__main__":
    engine = ReasoningEngine()
    facts = {"A": True, "B": False}
    engine.update_facts(facts)
    
    # Test cases
    test_cases = [
        ("A and B", None),  # Should return None since A is true but not B
        ("not B", True),
        ("A or not B", True),
        ("A and (B or not C)", None)  # 'C' is undefined, should return None
    ]
    
    for expr, expected in test_cases:
        result = engine.evaluate(expr)
        print(f"Expression: {expr} | Expected: {expected} | Result: {result}")
```