# -*- coding: utf-8 -*-

from typing import Any, Union

import abc
from enum import Enum, auto

from jwutils.log import *
from jwutils.Cmds import Cmds
from jwutils.db.DataBase import DataBase
from jwutils.db.Session import Session

class ResType(Enum): # export
    Statement    = auto()
    Scalars      = auto()
    One          = auto()
    First        = auto()
    Pages        = auto()

class QueryResult(abc.ABC): # export

    def __init__(self, session: Session, query: Any) -> None:
        self.__query = query
        self.__session = session

    @property
    def db(self) -> DataBase:
        return self.__query.db

    @property
    def query(self) -> DataBase:
        return self.__query

    @property
    def session(self) -> DataBase:
        return self.__session

    @property
    def schema(self):
        return self.__query.db.schema

    def rows(self) -> list[Any]:
        return self._cast(ResType.Scalars)

    def pages(self, per_page=20, page=1) -> Any:
        return self._cast(ResType.Pages, per_page=per_page, page=page)

    def one(self) -> Any:
        return self._cast(ResType.One)

    def first(self) -> Any:
        return self._cast(ResType.First)

    @property
    def statement(self) -> Any:
        return self._cast(ResType.Statement)

    # -- pure virtuals

    @abc.abstractmethod
    def _cast(self, session: Session, res_type: ResType, **kwargs) -> Union[Any|list[Any]]:
        pass