"""路由级鉴权依赖：Bearer JWT → 校验 token → 按 user_id 回查 sys_user → 注入用户。"""
from fastapi import Depends, Request
from sqlalchemy.ext.asyncio import AsyncSession

from config.deps import get_db
from model.sys_user import SysUser
from repositories.sys_user import SysUserRepo
from service.auth import decode_token
from utils.exceptions import AuthError, ForbiddenError


KNOWLEDGE_OPERATOR_ROLES = {"ADMIN", "KNOWLEDGE_ADMIN", "KNOWLEDGE_OPERATOR", "运营"}


async def get_current_user(
    request: Request, db: AsyncSession = Depends(get_db)
) -> SysUser:
    header = request.headers.get("Authorization", "")
    if not header.startswith("Bearer "):
        raise AuthError()
    try:
        user_id = int(decode_token(header.removeprefix("Bearer "))["user_id"])
    except Exception:
        raise AuthError("Token 无效或已过期")
    user = await SysUserRepo(db).get(user_id)
    if user is None:
        raise AuthError("用户不存在")
    if user.status != "正常":
        raise ForbiddenError("账号已被禁用或冻结")
    return user


async def require_knowledge_operator(user: SysUser = Depends(get_current_user)) -> SysUser:
    """Allow only administrators or explicitly assigned knowledge operators."""
    if user.user_type == "ADMIN":
        return user
    if user.user_type != "EMPLOYEE" or user.employee_role not in KNOWLEDGE_OPERATOR_ROLES:
        raise ForbiddenError("仅运营人员可以管理知识库")
    return user