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

import os, importlib

from ..Cmd import Cmd as Base
from ..CmdDistro import CmdDistro
from .backend.Util import Util

class Cmd(Base): # export

    from .backend.Backend import Backend

    def __init__(self, parent: CmdDistro, name: str, help: str) -> None:
        super().__init__(parent, name, help)
        self.__backend_path: str|None = None
        self.__util: Util|None = None
        self.__backend: Backend|None = None

    @property
    def distro_id(self) -> str:
        return self.parent.distro_id

    @property
    def interactive(self) -> bool:
        return self.parent.interactive

    @property
    def _backend_path(self):
        if self.__backend_path is None:
            backend_id = self.parent.distro_id.lower().replace('-', '_')
            match backend_id:
                case 'ubuntu' | 'raspbian' | 'kali':
                    backend_id = 'debian'
                case 'centos':
                    backend_id = 'redhat'
                case 'opensuse' | 'suse':
                    backend_id = 'suse'
            self.__backend_path = (
                os.path.splitext(__name__)[0]
                + '.backend.'
                + backend_id
                + '.'
            )
        return self.__backend_path

    def _instantiate(self, name: str, *args, **kwargs):
        module = importlib.import_module(self._backend_path + name)
        cls = getattr(module, name)
        return cls(self, *args, **kwargs)

    @property
    def util(self) -> Util:
        if self.__util is None:
            self.__util = self._instantiate('Util')
        return self.__util

    @property
    def _backend(self) -> Backend:
        if self.__backend is None:
            name = self.__class__.__name__[3:] # Get rid of "Cmd"
            self.__backend = self._instantiate(name)
        return self.__backend