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

from typing import Any

import abc

from jwutils.log import *
from jwutils.misc import load_classes
from jwutils.Cmds import Cmds
from jwutils.db.DataBase import DataBase
from jwutils.db.Session import Session
from jwutils.db.query.QueryResult import QueryResult
#from jwutils.db.query.Queries import Queries

class Query(abc.ABC): # export

    def __init__(self, parent: Any) -> None:
        self.__parent = parent

    # -- pure virtuals

    @abc.abstractmethod
    def _run(self, session: Session, *args, **kwargs) -> QueryResult:
        raise Exception('Called pure virtual _run()')

    @abc.abstractmethod
    def _register(self):
        raise Exception('Called pure virtual _register()')

    @abc.abstractmethod
    def _column_names(self) -> list[str]:
        raise Exception('Called pure virtual _column()')

    # -- used by Queries class

    def register(self):
        return self._register()

    # -- to be used

    def _add(self, query_name: str, location: str, func: Any):
        return self.__parent.add(self, query_name, location, func)

    def run(self, session: Session, *args, **kwargs) -> QueryResult:
        return self._run(session, *args, **kwargs)

    @property
    def parent(self):
        return self.__parent

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

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

    @property
    def column_names(self) -> list[str]:
        return self._column_names()