# -*- coding: utf-8 -*-
from enum import Enum
from os import listdir as ls
from subprocess import run as execute
from subprocess import PIPE
from sys import argv

from VoidServiceControl.env import *


class Help(Exception):
    def __str__(self):
        return ("Usage:\n---\nvsc {e/enable/on/up} <service_name> - Run service and add it to autostart\nvsc {"
                "d/disable/off/down <service_name> - Stop service and remove it from autostart")


def Su():
    user = execute('whoami', shell=True, text=True, stdout=PIPE).stdout[:-1]
    if user != 'root':
        raise PermissionError("Error: Access denied")


class Action(Enum):
    ENABLE = ["enable", "e", "on", "up"]
    DISABLE = ["disable", "d", "off", "down"]


class Arg(Enum):
    HELP = ["--help", "-h", "help"]

    @classmethod
    def all(cls):
        return cls.HELP.value + cls.__action()

    @classmethod
    def __action(cls):
        actions = list(map(lambda action: action.value, Action))
        out = []
        for lst in actions:
            out.extend(lst)
        return out


class Args(object):

    def __init__(self):
        self.__arguments = argv[1:]
        self.__check()

    def __check(self) -> None:
        if len(self.__arguments) != 2 and self.__arguments[0] not in Arg.HELP.value:
            raise TypeError("Error: Bad Usage")
        if self.__arguments[0] in Arg.HELP.value:
            raise Help()
        if self.__arguments[0] not in Arg.all():
            raise TypeError("Error: Invalid args")

    def __action(self) -> Action:
        actions = list(Action)
        for action in actions:
            if self.__arguments[0] in action.value:
                return action

    def __iter__(self):
        yield self.__action()
        yield self.__arguments[1]


class Service(object):
    __enabled = False

    def __init__(self, name: str) -> None:
        self.__name = name
        self.__check()

    def __check(self) -> None:
        all_services = ls(SV_PATH)
        enabled_services = ls(ENABLED_PATH)
        if self.__name not in all_services:
            raise ValueError(f"Error: Service {self.__name} doesn't exists")
        if self.__name in enabled_services:
            self.__enabled = True

    def getname(self) -> str:
        return self.__name

    def enable(self):
        if self.__enabled:
            raise ValueError(f"Error: Service {self.__name} already enabled")
        execute(f'ln -s {SV_PATH}/{self.__name} {ENABLED_PATH}/', shell=True)

    def disable(self):
        if not self.__enabled:
            raise ValueError(f"Error: Service {self.__name} already disabled")
        execute(f'rm {ENABLED_PATH}/{self.__name}', shell=True)


class Interface(object):

    def __init__(self, service: str) -> None:
        self.service = Service(service)

    def action(self, action: Action) -> None:
        match action:
            case Action.ENABLE:
                self.service.enable()
                print(f"Service '{self.service.getname()}' successfully enabled")
            case Action.DISABLE:
                self.service.disable()
                print(f"Service '{self.service.getname()}' successfully disabled")