from typing import Union

from bson import ObjectId


class CRUDBase:
    def __init__(self, coll_name):
        self.coll_name = coll_name

    async def get(self, db, id: Union[ObjectId, str]) -> dict:
        return (await db[self.coll_name].find_one({'_id': id})) or dict()

    async def insert_one(self, db, document):
        return await db[self.coll_name].insert_one(document)

    async def find_one(self, db, filter=None, *args, **kwargs):
        return (await db[self.coll_name].find_one(filter, *args, **kwargs)) or dict()

    async def read_have(self, db, v: str, **kwargs):
        where = {'members': v}
        where.update(kwargs)
        cursor = db[self.coll_name].find(where)
        return await cursor.to_list(length=9999)

    async def find_many(self, db, *args, **kwargs):
        cursor = db[self.coll_name].find(*args, **kwargs)
        return await cursor.to_list(length=9999)

    def find(self, db, *args, **kwargs):
        cursor = db[self.coll_name].find(*args, **kwargs)
        return cursor

    @staticmethod
    async def to_list(cursor):
        async for doc in cursor:
            yield doc

    async def delete(self, db, filter, collation=None, hint=None, session=None):
        return await db[self.coll_name].delete_many(filter, collation, hint, session)

    async def update_one(self, db, filter, update, upsert=False):
        return await db[self.coll_name].update_one(filter, update, upsert)

    async def distinct(self, db, key, filter=None):
        return await db[self.coll_name].distinct(key, filter)