#!/usr/bin/env python
# -*- coding: utf-8 -*-

from typing import Any, List, Union

from fastapi import Depends, Query
from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession

from common.const import RESOURCE_TYPES
from crud.base import CrudManager
from crud.resource import crud_work_category, crud_exam_category
from models.user import SysUser, Student, Teacher
from utils.depends import get_async_db, get_current_user


# 分类
async def get_category_tree(crud: CrudManager,
                            db: AsyncSession = Depends(get_async_db),
                            root: List[Any] = None):
    for item in root:
        children = await crud.fetch_all(db, filters=[text(f"pid={item.id}")])
        item.children = children
        await get_category_tree(crud, db, item.children)


async def get_categories(
        ctype: str = Query(..., description="资源类型，exam / work"),
        db: AsyncSession = Depends(get_async_db),
        current_user: Union[Teacher, Student] = Depends(get_current_user)):
    if ctype not in RESOURCE_TYPES:
        return {"errcode": 400, "mess": "资源类型错误!"}
    crud = crud_work_category if ctype == "work" else crud_exam_category
    root = await crud.fetch_all(db, filters=[text("pid = 0")])
    await get_category_tree(crud, db, root)
    return {"data": root}