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#!/usr/bin/python
# coding=utf-8

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
import logging
from collections import namedtuple
from typing import Optional, Dict, Generator, Tuple, List  # NOQA

from clcommon import cpapi, FormattedException
from lvestats.lib.commons import func


class UserNotFoundError(FormattedException):
    pass


class User(namedtuple('User', ['username', 'domain', 'reseller'])):
    pass


class UsersInfoManager(object):
    """
    Implements some different functions for user management;
    """
    def __init__(self):
        self.users_cache = {}  # type: Dict[str, User]

    def build_users_cache(self, reseller):
        # type: (Optional[str]) -> None
        """Cache data from cpapi for given reseller"""
        try:
            self.users_cache = dict(self._iter_panel_users(reseller))
        except cpapi.NotSupported:
            logging.info("Control panel API is not implemented, "
                         "some features may not work properly")

    def _iter_panel_users(self, reseller):
        # type: (Optional[str]) -> Generator[Tuple[str, User]]
        for login, reseller_, domain in self._iter_panel_users_tuples(reseller):
            yield login, User(username=login, reseller=reseller_, domain=domain)

    @staticmethod
    def _iter_panel_users_tuples(reseller):
        # type: (Optional[str]) -> Tuple[str, str, str]
        if reseller is None:
            for login, reseller_, domain in cpapi.cpinfo(keyls=('cplogin', 'reseller', 'dns')):
                yield login, reseller_, domain
        else:
            # TODO: do we really need get_reseller_domains?
            for login, domain in list(func.get_reseller_domains(reseller).items()):
                yield login, reseller, domain

    def get_domain(self, username, raise_exc=True):
        # type: (str, bool) -> Optional[str]
        """Get domain for user"""
        try:
            return self.users_cache[username].domain
        except KeyError as e:
            if raise_exc:
                raise UserNotFoundError({
                    'message': "An error occurred while getting domain for user %(username)s",
                    'context': {'username': username}}) from e
            return None

    def get_reseller(self, username, raise_exc=True):
        # type: (str, bool) -> Optional[str]
        """Get reseller for user"""
        try:
            return self.users_cache[username].reseller
        except KeyError as e:
            if raise_exc:
                raise UserNotFoundError({
                    'message': "An error occurred while getting reseller for user %(username)s",
                    'context': {'username': username}}) from e
            return None

    def get_login_list(self):
        # type: () -> List[str]
        """Get list of cached users"""
        return list(self.users_cache.keys())


g_users_manager = UsersInfoManager()