"""群管理工具：权限校验、目标用户解析"""
from __future__ import annotations

import logging

from telegram import Update
from telegram.constants import ChatMemberStatus
from telegram.ext import ContextTypes

import config
from db.models import Action, Ban, Message
from services.message_utils import schedule_delete

logger = logging.getLogger("spam_guard")

ADMIN_STATUSES = {ChatMemberStatus.ADMINISTRATOR, ChatMemberStatus.OWNER}


async def is_admin(update: Update, context: ContextTypes.DEFAULT_TYPE) -> bool:
    """判断命令发送者是否为群管理员或配置中的超级管理员。"""
    user = update.effective_user
    chat = update.effective_chat
    if not user or not chat:
        return False
    if user.id in config.ADMIN_USER_IDS:
        return True
    try:
        member = await context.bot.get_chat_member(chat.id, user.id)
        return member.status in ADMIN_STATUSES
    except Exception as e:
        logger.warning(f"管理员校验失败: user={user.id}, chat={chat.id}, err={e}")
        return False


async def require_admin(update: Update, context: ContextTypes.DEFAULT_TYPE) -> bool:
    """命令权限守卫。返回 True 表示允许继续。"""
    if await is_admin(update, context):
        return True
    reply = await update.message.reply_text("⛔ 只有群管理员可以使用这个命令")
    schedule_delete(update.message)
    schedule_delete(reply)
    return False


async def resolve_target_user(update: Update, args: list[str]) -> tuple[int | None, str]:
    """解析管理命令目标用户。

    支持：
    1. 回复某条消息后执行命令
    2. /cmd 用户ID
    3. /cmd @username，从历史消息/操作/封禁记录中反查 user_id
    """
    # 回复消息优先，最准确
    if update.message and update.message.reply_to_message and update.message.reply_to_message.from_user:
        u = update.message.reply_to_message.from_user
        username = u.username or u.first_name or str(u.id)
        return u.id, username

    if not args:
        return None, ""

    target = args[0].strip().lstrip("@")
    if target.isdigit():
        return int(target), target

    # Telegram Bot API 不能直接用 username 查群成员，只能从历史记录里反查
    msg = await Message.filter(username=target).order_by("-created_at").first()
    if msg:
        return msg.user_id, target

    action = await Action.filter(username=target, user_id__not_isnull=True).order_by("-created_at").first()
    if action:
        return action.user_id, target

    ban = await Ban.filter(username=target).order_by("-created_at").first()
    if ban:
        return ban.user_id, target

    return None, target