# --- Base Agent with file support ---
class FileAwareAgent:
    """
    Minimal base that accepts a question and an optional file_path.
    Subclasses can override `answer` to implement custom logic.
    """

    def __call__(self, question: str, file_path: str | None = None) -> str:
        preview = question[:50] if isinstance(question, str) else str(question)[:50]
        print(f"Agent received question (first 50 chars): {preview}...")
        if file_path:
            print(f"Agent received file_path: {file_path}")
        fixed_answer = self.answer(question, file_path)
        print(f"Agent returning answer: {fixed_answer}")
        return fixed_answer

    def answer(self, question: str, file_path: str | None = None) -> str:
        raise NotImplementedError


# --- Basic Agent Definition ---
class BasicAgent(FileAwareAgent):
    def __init__(self):
        print("BasicAgent initialized.")

    def answer(self, question: str, file_path: str | None = None) -> str:
        # Placeholder logic; replace with real solution strategy.
        return "This is a default answer."


class LangAgent(FileAwareAgent):
    def __init__(self):
        print("LangAgent initialized.")

    def answer(self, question: str, file_path: str | None = None) -> str:
        # Placeholder logic; replace with language-model-based solution.
        if file_path:
            # Keep the intent (point to the file) but fix formatting.
            return f"To answer this question I should read this file: {file_path}"
        else:
            return "This is a default answer."