class LLMInstructions:
    """
    Defines structured instructions that are sent along with each request
    to the LLM to guide its behavior (norms, goals, etc.).
    """

    @staticmethod
    def default_norms() -> list[str]:
        return [
            "Be friendly and respectful.",
            "Make the conversation feel natural and engaging.",
        ]

    @staticmethod
    def default_goals() -> list[str]:
        return [
            "Try to learn the user's name during conversation.",
        ]

    def __init__(self, norms: list[str] = None, goals: list[str] = None):
        self.norms = norms or self.default_norms()
        self.goals = goals or self.default_goals()

    def build_developer_instruction(self) -> str:
        """
        Builds a multi-line formatted instruction string for the LLM.
        Includes only non-empty structured fields.
        """
        sections = [
            "You are a Pepper robot engaging in natural human conversation.",
            "Keep responses between 1–3 sentences, unless told otherwise.\n",
            "You're given goals to reach. Reach them in order, but make the conversation feel "
            "natural. Some turns you should not try to achieve your goals.\n",
        ]

        if self.norms:
            sections.append("Norms to follow:")
            for norm in self.norms:
                sections.append("- " + norm)
            sections.append("")

        if self.goals:
            sections.append("Goals to reach:")
            for goal in self.goals:
                sections.append("- " + goal)
            sections.append("")

        return "\n".join(sections).strip()