"""掷骰子 —— 业务逻辑(Service 层,不依赖 nonebot,可单测)。"""

from __future__ import annotations

import random


def build_dice_message(
    num: int,
    min_: int,
    max_: int,
    opr: int,
    offset: int,
    tip: str = "的掷骰结果是：",
) -> str:
    if num == 0:
        return "咦？我骰子呢？"
    min_, max_ = min(min_, max_), max(min_, max_)
    rolls = [random.randint(min_, max_) for _ in range(num)]
    total = sum(rolls)
    rolls_str = "+".join(map(str, rolls))
    if len(rolls_str) > 100:
        rolls_str = str(total)
    res = total + opr * offset
    sign = " -+"[opr]
    return "".join(
        [
            f"{tip}\n",
            str(num) if num > 1 else "",
            "D",
            f"{min_}~" if min_ != 1 else "",
            str(max_),
            f"{sign}{offset}" if offset else "",
            f"={rolls_str}",
            f"{sign}{offset}" if offset else "",
            f"={res}" if offset or num > 1 else "",
        ]
    )