"""Offline, dependency-free demonstration of defensive LLM response checks."""
from dataclasses import dataclass, asdict
import re

@dataclass(frozen=True)
class Evaluation:
    passed: bool
    flags: tuple[str, ...]
    response_chars: int

def evaluate_response(response: str) -> Evaluation:
    """Apply illustrative checks; not a comprehensive safety classifier."""
    if not isinstance(response, str):
        raise TypeError('response must be a string')
    flags = []
    if not response.strip():
        flags.append('empty_response')
    if re.search(r'(?i)\b(?:system prompt|ignore previous instructions)\b', response):
        flags.append('review_instruction_reference')
    return Evaluation(passed=not flags, flags=tuple(flags), response_chars=len(response))

def evaluate_batch(responses: list[str]) -> list[dict]:
    return [asdict(evaluate_response(item)) for item in responses]