from __future__ import annotations


def format_scheduled_user_reminder(prompt_text: str) -> str:
    body = str(prompt_text or "").strip()
    if not body:
        return ""
    if body.startswith("⏰"):
        return body
    return f"⏰ 提醒：{body}"


def build_scheduled_turn_instruction(*, prompt_text: str, mode: str, lang: str) -> str:
    """Internal LLM instruction for proactive scheduled reminders (not user-facing)."""
    intent = str(prompt_text or "").strip()
    _ = str(mode or "scheduled").strip()
    is_en = str(lang or "").lower().startswith("en")
    if is_en:
        return (
            "[Scheduled proactive reminder — internal instruction, not a user message]\n"
            f"Reminder intent: {intent}\n"
            "Write a short, friendly proactive reminder TO the user (second person). "
            "Do not say you received a reminder or that you will remind someone; speak directly to the user."
        )
    return (
        "【定时主动提醒·内部指令，不是用户发言】\n"
        f"提醒意图：{intent}\n"
        "请生成一条简短、自然、第二人称的主动提醒消息直接对用户说。"
        "不要写「收到提醒」「好的我来提醒用户」等元对话；不要假装用户刚说了话。"
    )


def scheduled_turn_system_suffix(*, lang: str) -> str:
    is_en = str(lang or "").lower().startswith("en")
    if is_en:
        return (
            "\n\n[Scheduled job mode] You are sending a proactive reminder to the user. "
            "Reply with the reminder text only; do not role-play as the user."
        )
    return (
        "\n\n【定时任务模式】你正在主动向用户发送提醒。"
        "只输出提醒正文，不要扮演用户，不要写「收到/好的」等对话式应答。"
    )


__all__ = [
    "build_scheduled_turn_instruction",
    "format_scheduled_user_reminder",
    "scheduled_turn_system_suffix",
]